Explanation:
Set up the ion formation equations, with ionization energy values for each electron in the valence layer, of the atoms of the chemical elements below: a) Na z=11 b) Ca z= 20 c) Sr z 38 d) Li z= 3 e) Cs z= 55 f) Be z= 43
Can some one please explain?
1). Compared to the chemical oxidation of one atom of carbon, a nuclear fission reaction using one atom of uranium can yield about ____ times the energy output.
A)5
B)50
C)5000
D)5,000,000
2). In a nuclear fusion reaction, the total mass numbers of the reactants may equal the total mass numbers of the products. How can it still be true that mass is lost in nuclear fusion reactions?
A)In a nuclear fusion reaction, the fused nucleus is initially stable but then decays and loses mass.
B)The mass number is just an estimated mass measurement that is not precise.
C)The mass number only represents the total number of nucleons, which may be conserved.
D)In a nuclear fusion reaction, the products have greater kinetic energy than the reactants.
3). Nuclear fission reactions generally require:
A) small atomic nuclei to join together
B) large atomic nuclei to join together
C)small atomic nuclei to split apart
D)large atomic nuclei to split apart
Answer:
Explanation:
1 ) D)5,000,000
Compared to the chemical oxidation of one atom of carbon, a nuclear fission reaction using one atom of uranium can yield about 5000000____ times the energy output.
Energy in fission reaction comes from the conversion of mass into energy . This process results into creation of enormous amount of energy . But in the oxidation reaction of carbon , bonds are broken and new bonds are formed in which energy is used and released . The net energy released is difference of energy evolved minus energy used up . This difference is not much . Hence in such chemical reaction , energy released is not much .
2 ) B)The mass number is just an estimated mass measurement that is not precise.
In such calculation , the mass number used is just an estimated mass number and not the precise mass of particles involved . Hence , due to lack of precision in calculation , mass number appears to be constant . But actually there is decrease in mass in both fission and fusion reaction .
3 ) D
In fission reaction , large atomic nuclei splits into smaller nuclei to attain stability .
What is the final temperature of a 27.2-gram wooden block that starts at 23.4 degrees celsius and loses 759 joules of energy? The specific heat capacity of wood is 1.716 joules/gram degree Celsius.
Answer:
The correct answer is 7.1 degree C.
Explanation:
Based on the given information, the initial temperature or To of the block is 23.4 degree C.
The energy lost or Q from the given wooden block is -759 J.
The specific heat capacity or c of the wood given is 1.716 J/g°C
The mass of the wooden block given is 27.2 grams.
There is a need to find the final temperature of the wooden block, for this the formula to be used is,
Q = m × c × (T-To)
Now by putting the given values in the formula we get,
-759 = 27.2 × 1.716 (T - 23.4)
T = 7.1 degree C.
Would the boiling point of water at 0.5 atm be lower, the same, or higher than the
boiling point of water at 1 atm?
Answer:
Lower.
Explanation:
When you lower the pressure of water, it will usually decrease the boiling point. So, the higher you are on Earth, the lower the boiling point of H2O becomes.
Question 1 of 32
What is the noble gas configuration for arsenic (As)?
The Periodic Table
A. [Ar] 4s 30104p3
B. [Kr] 4p3
C. [Ar] 4p3
O D. [Kr] 45230104p3
Answer:
[Ar] 3d¹⁰ 4s² 4p³
Explanation:
As = [Ar] 3d¹⁰ 4s² 4p³
A sample of an ideal gas at 1.00 atm and a volume of 1.73 L was placed in a weighted balloon and dropped into the ocean. As the sample descended, the water pressure compressed the balloon and reduced its volume. When the pressure had increased to 70.0 atm, what was the volume of the sample
Answer:
Volume is 0.0247L
Explanation:
This question involves the use of Boyle's law which states that the volume of a given mass of gas is inversely proportional to it's pressure provided that temperature remains constant.
Mathematically,
v = k/p
K = VP
P1V1 = P2V2 = P3V3 = .........=PnVn
V = volume
p = pressure
Data;
P1 =1.0atm
V1 = 1.73L
P2 = 70atm
V2 = ?
P1V1 = P2V2
V2 = P1V1 / P2
V2 = (1.0×1.73)/70
V2 = 0.0247L
The volume of the sample is 0.0247L
A volcano violently erupts near a small town and wildlife preserve. Which effect might occur? Some local species develop new adaptations. New species form at the wildlife preserve. Many wildlife species become extinct. Ash and dust fill the air and reduce sunlight.
Answer:
Ash and dust fill the air and reduce sunlight.
Explanation:
Ash and dust comes out of volcanoes, and it is bad for the environment. Polluting the air and causing fogginess, it also reduces sunlight.
Answer:
d
Explanation:
Which compound can be used to preserve biological specimens? A central C is double bonded to an O, and single bonded to 2 H. A chain, reading from left: C H 3 bonded to C, bonded to O, bonded to C H 2, bonded to C H2, bonded to C H 3. The single C near the beginning of the chain is double bonded to O. C H 3 single bonded to C, which is double bonded above right to O, and below right to C H 2, which is bonded to C H 3. A central C is double bonded to an O above, and single bonded to C H 3 below left and O H below right.
Answer:
A central C is double bonded to an O, and single bonded to 2 H
Explanation:
Methanal, also known as formaldehyde, is a chemical compound used to preserve dead biological specimens for further study. It is called formalin when in a solution and it helps keep specimens in a fresh state by hardening the tissues of the specimen involved.
Formaldehyde is a gaseous compound that has an aldehyde functional group i.e. -CHO and has a chemical formula, H-CHO or CH2O as described in the question that a central C is double bonded to an O, and single bonded to 2 H (see attached image for structural formula).
The chemical for the preservation of biological specimens has consisted of central C with a double-bonded O and two single-bonded hydrogens. Thus, option A is correct.
The biological compound that has been used to preserve biological specimens has been methanal. It has been the simplest aldehyde. The chemical formula of formaldehyde, also known as methanal has been H-CHO.
The structure of formaldehyde has been consisted with single bond between H and C. The central carbon has been associated with a double bond between the C and O, with single-bonded H.
Thus, the chemical for preservation of biological specimen has been consisted of central C with a double-bonded O and two single-bonded hydrogens. Thus, option A is correct.
For more information about the biological specimen, refer to the link:
https://brainly.com/question/7458550
Which equation is a decomposition reaction? Li2CO3 Right arrow. Li2O + CO2 Zn + HCl Right arrow. ZnCl2 + H2 Na2O + CO2 Right arrow. Na2CO3 C6H12O6 + O2 Right arrow. CO2 + H2O
Answer:
Li₂CO₃ ⇒ Li₂O + CO₂ is a decomposition reaction.
Explanation:
In a decomposition reaction, a single substance decomposes, producing two or more different substances. In other words, in this type of reaction two or more substances are formed from a compound. The atoms that form a compound separate to give the products according to the formula:
AB → A + B
It can occur spontaneously, or be aided by a catalyst, heat, or electrolysis.
In this case:
Li₂CO₃ ⇒ Li₂O + CO₂ It is a type of chemical reaction in which a single compound decomposes into two or more compounds. So it is a decomposition reaction.
Answer:
A. Li2CO3 Right arrow. Li2O + CO2
Explanation:
Correct answer on edge 2022.
The image below shows the Lake Mead Recreation Area,
which is near the Grand Canyon The diagram shows the
ages of layers of rock in one region of the park, The layers
at this location are fairly smooth and distinct
Private
What are these smooth, distinct layers most directly evidence of?
A Soll creep along the rocky cliffe
B. Many landslides and mudslides
6. Extensive chemical weathering
D. Many, many years of deposition
Answer:
D. Many, many years of deposition
Explanation:
The layers of the rocks in one region of the parks are smooth and distinct, which are evidence of many, many years of deposition.
The layers on the rocks are because of different deposition of sediments. Different sediments deposited over the rocks through wind, water and ice over the ages.
Hence, the correct answer is D.
Answer:
d
Explanation:
a pex
If 56 J of heat is added to an aluminum can with a mass of 23.6 g , what is its temperature change? Specific heat capacity of aluminum is 0.903 J/g∘C.
Answer:
Q = mass x sph x temp change
temp change = Q/(mass x sph)
Temp change =57/(22 x .903)
Temp Change = 2.97 ∘C
Temp change 3.0 ∘C
or
We can use the heat equation,
Q = mcΔT
Where Q is the amount of energy transferred (J), m is the mass of the substance (g), c is the specific heat (J g⁻¹ °C⁻¹) and ΔT is the temperature difference (°C).
The given data
Q = 52 J
m = 28.4 g
c = 0.903 J g⁻¹ °C⁻¹
ΔT = ?
By applying the formula,
52 J = 28.4 g x 0.903 J g⁻¹ °C⁻¹ x ΔT
ΔT = 2.03 °C
Hence, the temperature change of aluminium during the heating process is 2.03 °C.
What is the Ka of a 1.9 ~ 10-2 M
solution of carbonic acid (H2CO3)
with a pH of 3.88?
Ka = [ ? ] × 10!?)
Helllllp
Answer:
Ka = 9.2x10⁻⁷
Explanation:
The equilibrium of carbonic acid in water is:
H₂CO₃ ⇄ HCO₃⁻ + H⁺
Where Ka is defined as:
Ka = [HCO₃⁻] [H⁺] / [H₂CO₃]
The equilibrium concentration of the species is:
[H₂CO₃] = 1.9x10⁻² - X
[HCO₃⁻] = X
[H⁺] = X
As pH is -log[H⁺]
3.88 = -log[H⁺]
1.318x10⁻⁴ = [H⁺] = X
Replacing:
[H₂CO₃] = 1.9x10⁻² - 1.318x10⁻⁴ = 1.8868x10⁻²
[HCO₃⁻] = 1.318x10⁻⁴
[H⁺] = 1.318x10⁻⁴
Replacing in ka equation:
Ka = [1.318x10⁻⁴] [1.318x10⁻⁴] / [1.8868x10⁻²]
Ka = 9.2x10⁻⁷Answer: 9.2 x 10^-7
Explanation:
how many moles of MgCl2 are produced from 4 moles of HCl
Answer:
2 moles of MgCl2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
Mg + 2HCl —> MgCl2 + H2
Now, we can determine the number of mole MgCl2 produced from 4 moles of HCl as follow:
From the balanced equation above,
2 moles of HCl reacted to produce 1 mole of MgCl2.
Therefore, 4 moles of HCl will react to produce = (4 x 1)/2 = 2 moles of MgCl2.
Therefore, 2 moles of MgCl2 were produced from the reaction of 4 moles of HCl.
Hypothesis 2 (Particle size): If you
the particle size of a reactant, then the reaction rate
will increase because of the reactant's surface area is exposed allowing more particles to make
contact with each other.
Answer:
Increase the particle size of a reactant
Explanation:
Let me rewrite this question. I am assuming that it should be as follows,
If you _____ the particle size of a reactant then the reaction rate will increase because of the reactant's surface area is exposed allowing more particles to make contact with each other.
And, here we are being asked to fill this dash line _____
It could only be that the particle size increases or decreases. Increasing the size of the reactant will increase the chance of collisions if the container with which the reactants are kept are constant. This would increase the reaction rate - thus _____ = increases.
Answer: decrease, more
Explanation: i just did it
Describe how you could determine the specific heat of a sample of a solid substance. You may assume
at the substance does not react with water. In your answer, make sure to include a description of what
quipment you would use and how you would interpret the data you collected.
To calculate the actual heat, I'd use calorimetric to weigh a sample mass. I 'd calculate the mass of a material sample. At a specified temperature, I will heat the material. I should position the heated material inside a calorimeter for coffee cup containing an initially established mass of water. I 'd wait for the weather to stabilize and then measure the difference in weather. To assess the sum of energy consumed, I will use the increase in water temperatures. For measure real heat I will use the sum of energy per material, weight, and temperature shift.
-------------------------------
Hope this helps!
Brainliest would be great!
-------------------------------
With all care,
07x12!
Answer:
-I would use calorimetry to determine the specific heat.
-I would measure the mass of a sample of the substance.
-I would heat the substance to a known temperature.
-I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature.
-I would wait for the temperature to equilibrate, then calculate temperature change.
-I would use the temperature change of water to determine the amount of energy absorbed.
-I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.
What gas is used in freezers and fridges?
Answer:
Chloro-Flouro-Carbon
Explanation:
Chloro-Flouro-Carbon (CFC Gas) is used as a refrigerant in fridges and freezers.
What information did the scientists miss in 1948 and 1966 that caused them to
believe that the caps contained water ice?
Answer:
The information from Mariner 6 and Mariner 7
Explanation:
Because they had not been launched yet
17.An element X on reacting with oxygen forms XO2. The oxide when dissolved in water turned red litmus blue. What will be the nature of ‘X’? Give reason for your answer.
Answer:
The oxide is basic, X must be a group two metal
Explanation:
The oxide XO2 must be an inorganic peroxide of a group two element. Inorganic peroxides of group two elements are highly basic because they dissolve in water to yield the corresponding metal hydroxides. These metal hydroxides are strongly basic solutions with a very high pH. Hence X may be Calcium, magnesium, barium, strontium or radium.
Group two metal peroxides include; CaO2, MgO2,BaO2 etc. They all dissolve in water to give corresponding basic solutions. For instance, calcium peroxide reacts with water as follows; CaO2 (s) + 2H2O(l) --------->Ca(OH)2(aq) + H2O2(aq). The production of Ca(OH)2 makes the solution basic. The hydrogen peroxide produced decomposes to water and oxygen.
I really need help with these chemistry questions pleasee
Answer:
The answer to your question is given below
Explanation:
8. The equation for the reaction is given below:
Mg3N2 + H2O –> Mg(OH)2 + NH3
Number of reactant atoms before balancing:
Mg = 3
N = 2
H = 2
O = 1
Number of product atoms before balancing:
Mg = 1
N = 1
H = 5
O = 2
Now, let us balanced the equation.
Mg3N2 + H2O –> Mg(OH)2 + NH3
There are 3 atoms of Mg on the left side and 1 atom on the right side. It can be balance by putting 3 in front of Mg(OH)2 as shown below:
Mg3N2 + H2O –> 3Mg(OH)2 + NH3
There are 2 atoms of N on the left side and 1 atom on the right side. It can be balance by putting 2 in front of NH3 as shown below:
Mg3N2 + H2O –> 3Mg(OH)2 + 2NH3
There 2 atoms of H on the left side and a total of 12 atoms on the right side. It can be balance by putting 6 in front of H2O as shown below:
Mg3N2 + 6H2O –> 3Mg(OH)2 + 2NH3
Now the equation is balanced.
Number of reactant atoms after balancing:
Mg = 3
N = 2
H = 12
O = 6
Number of product atoms after balancing:
Mg = 3
N = 2
H = 12
O = 6
9. When methane react with steam, carbon dioxide and hydrogen gas are produced as shown below:
CH4 + H2O –> CO + H2
Now, let us balance the equation. This is illustrated below:
There are a total of 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 3 in front of H2 as shown below:
CH4 + H2O –> CO + 3H2
Now the equation is balanced.
___resources will run out one day.___the use of non-renewable
resources now will make supplies last longer. Fossil___
are non-renewable resources.
Burning fossil fuels releases___
which contributes to___
change.
Burning___
fossil fuel will help to reduce this effect. Accidents with oil rigs or___
can pollute the sea with oil and kill___
Nuclear fuel is non-renewable.It is used in___power stations.
These are very ___ to build and to ___ Accidents in nuclear power stations can release___ materials into the atmosphere
Nuclear fuel is non-renewable. It is used in
power stations. These are very
to build and to
Accidents in nuclear power stations can
release
materials into the atmosphere.
Answer:
Non Renewable__resources will run out one day._Slowing/stopping__the use of non-renewable
resources now will make supplies last longer. Fossil_Fuels__
are non-renewable resources.
Burning fossil fuels releases_Carbon Dioxide__
which contributes to_Pollution__
change.
Burning_less__
fossil fuel will help to reduce this effect. Accidents with oil rigs or_mines/power plants__
can pollute the sea with oil and kill_wildlife__
Nuclear fuel is non-renewable.It is used in_Nuclear__power stations.
These are very _Expensive__ to build and to _can cause__ Accidents in nuclear power stations can release__dangerous_ materials into the atmosphere
Nuclear fuel is non-renewable. It is used in
power stations. These are very
to build and to
Accidents in nuclear power stations can
release
materials into the atmosphere.
Explanation:
Definitions:
Fossil fuel- A fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing organic molecules originating in ancient photosynthesis that release energy in combustion
Fossil fuels produce large quantities of carbon dioxide when burned. Carbon emissions trap heat in the atmosphere and lead to climate change. In the United States, the burning of fossil fuels, particularly for the power and transportation sectors, accounts for about three-quarters of our carbon emissions.
Carbon dioxide from the burning of fossil fuels accumulates in the atmosphere, where it causes global warming. But it also affects our oceans. As carbon dioxide enters the ocean, it reacts with sea water to form carbonic acid. ... That's the equivalent in weight of 500 billion Volkswagen Beetles dumped at sea.
A nuclear power plant is a thermal power station in which the heat source is a nuclear reactor. As is typical of thermal power stations, heat is used to generate steam that drives a steam turbine connected to a generator that produces electricity.
Sulfuryl dichloride may be formed from the reaction of sulfur dioxide and chlorine. SO2(g) + Cl2(g) → SO2Cl2(g) Substance: SO2(g) Cl2(g) SO2Cl2(g) ΔH°f (kJ/mol) at 298 K –296.8 0 –364.0 ΔG°f (kJ/mol) at 298 K –300.1 0 –320.0 S°(J/K • mol) at 298 K 248.2 223.0 311.9 What is ΔG°rxn for this reaction at 600 K?
Answer:
ΔG°rxn = 28.4kJ/mol at 600K
Explanation:
Using Hess's law, you can find the ΔH°rxn and S° subtracting ΔH°f of products - ΔH°f of reactants ×its coefficients. In the same way for S°rxn
For example, for the reaction:
aA + bB → cC:
ΔH°rxn = c×ΔH°fC - (a×ΔH°fA + b×ΔH°fB).
S°rxn = c×S°fC - (a×S°fA + b×S°fB).
For the reaction:
SO₂(g) + Cl₂(g) → SO₂Cl₂(g)
ΔH°rxn = 1×ΔH°f{SO₂Cl₂} - (1×ΔH°fSO₂ + 1×ΔH°fCl₂).
S°rxn = 1×S°f{SO₂Cl₂} - (1×S°fSO₂ + 1×S°fCl₂).
As at 298K:
ΔH°f{SO₂Cl₂} = -364.0kJ/mol
ΔH°f{SO₂} = -296.8kJ/mol
ΔH°f{Cl₂} = 0kJ/mol
ΔH°rxn = 1×{-364.4kJ/mol} - (1×-296.8kJ/mol + 1×0).
ΔH°rxn = -67.2kJ/mol at 298K.
S°f{SO₂Cl₂} = 311.9J/molK
S°f{SO₂} = 248.2J/molK
S°f{Cl₂} = 223.0J/molK
S°rxn = 1×{311.9J/molK} - (1×248.2J/molK + 1×223.0J/molK).
S°rxn = -159.3J/molK = -0.159.3KJ/molK
Using:
ΔG°rxn = ΔH°rxn - S°rxn×T
Assuming ΔH°rxn doesn't change at 600K:
ΔG°rxn = -67.2kJ/mol - -0.159.3J/molK×600K
ΔG°rxn = 28.4kJ/mol at 600K3.00g of glucose was burned in an excess of oxygen in bomb calorimeter with metal holder ("bomb") heat capacity of 2.21 kJ/oC. And 1.2kg of water where water has a specific heat capacity of 4.184 kJ/kgoC. The temp change upon combustion of glucose and oxygen was 19.0 0C to 25. 50C.Calculate the heat evolved from the combustion of 1.00 mol of glucose.
Answer:
THE HEAT EVOLVED FROM THE COMBUSTION OF 1 MOLE OF GLUCOSE IS - 2819.7 KJ/MOL OR -2.82 * 10^3 KJ/MOL OF HEAT.
Explanation:
Write out the variables given:
Mass of glucose = 3 g
Heat capacity of bomb calorimeter = 2.21 kJ /°C
Mass of water = 1.2 kg
Specific Heat capacity of water = 4.184 kJ/kg °C
Change in temperature = ( 25.50 °C - 19.0 °C ) = 6.5 °C
To calculate the heat evolved from the combustion of 1 mole of glucose, we do the following:
Equation for the reaction:
C6H1206 (s) + 6 02 (g)--------> 6 CO2 (g) + 6 H20 (l)
Calculate the total heat capacity involved in the system:
Heat capacity (Ctotal) = Heat capacity of the bomb calorimeter + heat capacity of water
Ctotal = 2.21 kJ/°C + (1.2 * 4.184 kJ/kg°C)
Ctotal = 7.2308 kJ°C
Next is to calculate the heat absoorbed by the calorimeter and water
Heat = Heat capacity (Ctotal) * change in temperature
Heat = 7.23 kJ/°C * 6.5 °C
Heat = 46.995 kJ
Hence, the amount of heat evolved when 3g of glucose was involved is 46.995 kJ
Since 1 mole of glucose reacts with 6 moles of oxygen to produce 6 moles of carbon dioxide and water respectively, then the amount of heat needed for the combustion of 1 mole of glucose is:
1 mole of glucose = (12 *6 + 1 * 12+ 16 *6) = 180 g/mol
From 3 g of glucose producing 46.995 kJ of heat
180 g of glucose will produce (180 * 46.995 / 3) kJ of heat
= 2819.7 kJ/mol of heat.
In conclusion, from the combustion of 1 mole of glucose, -2819.7 kJ/ mol of heat is evolved, since the heat was evolved or liberated.
How much energy does an X-ray with an 8 nm (8 x 10-9 m) wavelength have?
Answer: 2.48×10^-17 J
Explanation:
Given the following :
Wavelength = 8nm (8 x 10^-9 m)
Energy(e) of X-ray =?
Energy=[speed of light(c) × planck's constant (h)] ÷ wavelength
Speed of light = 3×10^8m/s
Planck's constant = 6.626×10^-34 Js
Wavelength = 8 x 10^-9 m
Energy = [(3×10^8) * (6.626×10^-34)] / 8 x 10^-9
Energy = [19.878×10^(8-34)] / 8 x 10^-9
Energy = 2.48475 × 10^(-26+9)
Energy = 2.48×10^-17 J
Answer: 2.48×10^-17 J
Explanation: a pex
Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory? more gas particles Right arrow. More collisions Right arrow. Higher pressure smaller volume Right arrow. Crowded particles Right arrow. Less collisions Right arrow. Lower pressure smaller volume Right arrow. Crowded particles Right arrow. More collisions Right arrow. Higher pressure more gas particles Right arrow. More kinetic energy Right arrow. More volume Right arrow. Higher pressure
Answer:
smaller volume ⇒ Crowded particles ⇒ More collisions ⇒ Higher pressure
Explanation:
Smaller the volume , more crowed the particles . Then the particles will have rapid collisions so the free mean path is decreased , hence the pressure will be increased as follows
[tex]P=\frac{K_bT}{\sqrt{2}\pi d^2\lambda }[/tex]
where λ is mean free path , P is pressure .
The sequence the represent the relationship between pressure and volume of an ideal gas is: smaller volume right arrow Crowded particles right arrow More collisions right arrow Higher pressure
The kinetic molecular theory made five postulates which are used to explain the behaviour of gases.
From the postulates, he uses the kinetic molecular theory to explain Boyle's Law because the majority of a gas's volume in space is usually empty and may be compressed.
So, when a gas is compressed without affecting its temperature, the average kinetic energy of the gas particles remains constant. The particles continue to flow at the same rate, but the container has reduced.
As a result, the particles go from one end of the container to another in less time. This suggests they're hitting the barriers (collision) more frequently. Each and every increase in the frequency of collisions with the walls, thus, results in an increase in the gas's pressure.
Hence, as the volume of a gas decreases, the pressure of the gas increases.
Learn more about the Kinetic molecular theory here:
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A mixture is best described as:
A. None of these
B. A pure chemical substance consisting of one type of atom.
OC. The basic building blocks of matter.
D. Two or more elements or compounds that are mixed together but not chemically bonded.
Answer:
D. Two or more elements or compounds that are mixed together but not chemically bonded.
Explanation:
Mixture is unique as it is not chemically bonded and individual entities such as elements or compounds keep their unique identities.
Answer:
Mixture consists of two or three elements or compounds that are mixed together but not chemically bonded.
Which example is indirect evidence used to study Earth's interior?
O composition of minerals in a rock
age of a rock from within Earth
O location of an earthquake's epicenter
O texture of different core rock samples
Answer:
location of earthquakes epicenter
Explanation:
The location of an earthquake's epicenter is indirect evidence used to study Earth's interior. Therefore, option C is correct.
What is Earth's interior ?The Earth's interior is made up of four layers, three solid and one liquid—molten metal that is nearly as hot as the sun's surface. The deepest layer is a solid iron ball with a diameter of about 1,500 miles.
The Earth's core is significant for three reasons: (1) it generates the planet's magnetic field; (2) it contains information about the planet's early history of accretion; and (3) it contains information about the planet's earliest history of accretion.
Geologists use an indirect method as well. They use seismic waves instead of knocking on walls. Seismic waves are produced when earthquakes occur. Geologists study seismic waves and how they travel through the Earth.
Thus, option C is correct.
To learn more about the Earth's interior, follow the link;
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#SPJ6
Chemistry Question! 20 Points!
Nuclear decay is more likely to occur when:
- the mass number is greater than 83.
- the atomic number is greater than 83.
- the sum of the number of electrons + the atomic number is greater than 83.
- the sum of the mass number + the number of electrons is greater than 83.
Answer:
A
Explanation:
I guess it's a, because nuclear decay is likely to occur when either the mass or atomic number is greater than 83.
Answer:
B) the atomic mass is greater than 83.
Explanation:
Hope this helps! Have a great day!! :)
Which statement is correct about the rate of a chemical reaction? (5 points)
It increases when the concentration of reactants increases.
It does not depend on the concentration of reactants.
it increases when the temperature decreases.
It does not depend on the temperature.
Answer:
A) It increases when the concentration of reactants increases.
Explanation:
When you increase the concentration, there is more of a substance, and therefore more opportunities for the reactants to collide together with enough energy to create a product.
Answer:
A) It increases when the concentration of reactants increases.
Explanation:
It's just right!!!
Question 16 of 20 :
Select the best answer for the question.
16. Which of the following is true of alloys?
O A. They must contain a metal.
B. They can only be composed of metals.
C. They must be held together by chemical bonds.
O D. They're liquid solutions.
Mark for review (Will be highlighted on the review page)
The statement that is true about alloy is that; they can only be composed of metals.
What is an alloy?An alloy is a substance that is obtained by the combination of two or more metals. Alloys are produced owing to the fact that they may be stronger or more durable or resistant to corrosion than the individual metals.
There are many allows that find very good use such as the alloy of copper and zinc which we call bronze that could be used as an ornamental. The statement that is true about alloy is that; they can only be composed of metals.
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A balloon has a volume of 0.56 L and a pressure of 1.34 atm. The balloons pressure decreased to 0.85 atm,
what is the balloons new volume? Write your solution, including the formula used.
Answer:
[tex]\large \boxed{\text{0.88 L}}[/tex]
Explanation:
The temperature and amount of gas are constant, so we can use Boyle’s Law.
[tex]p_{1}V_{1} = p_{2}V_{2}[/tex]
Data:
[tex]\begin{array}{rcrrcl}p_{1}& =& \text{1.34 atm}\qquad & V_{1} &= & \text{ 0.56 L} \\p_{2}& =& \text{0.85 atm}\qquad & V_{2} &= & ?\\\end{array}[/tex]
Calculations:
[tex]\begin{array}{rcl}\text{1.34 atm} \times \text{0.56 L} & =& \text{0.85 atm} \times V_{2}\\\text{0.750 L} & = & 0.85V_{2}\\V_{2} & = &\dfrac{0.750}{0.85}\\\\& = &\textbf{0.88 L}\\\end{array}\\\text{The balloon's new volume is $ \large \boxed{\textbf{0.88 L}}$}[/tex]
5.What is the chemibal formula for lead (II) iodide
Answer: The chemical formula for lead (II) iodide is [tex]PbI_2[/tex]
Explanation:
Lead (II) iodide is a ionic compound because it are formed by transference of electrons between metals and non metals.The bond formed between a metal and a non-metal is always ionic in nature.
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
The nomenclature of ionic compounds is given by:
1. Positive is written first followed by the oxidation state of metal in roman numerals in square brackets.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
The chemical formula for lead (II) iodide is [tex]PbI_2[/tex]