Answer:
crest
Explanation:
QUESTION 4
How many moles are in 3.2 x 1024 of CO2 molecules? (round answer to the correct number of sig figs)
Answer:
5.3 mol CO₂
General Formulas and Concepts:
Chemistry - Stoichiometry
Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.2 × 10²⁴ molecules CO₂
Step 2: Convert
[tex]3.2 \cdot 10^{24} \ mc \ CO_2(\frac{1 \ mol \ CO_2}{6.022 \cdot 10^{23} \ mc \ CO_2} )[/tex] = 5.31385 mol CO₂
Step 3: Check
We are given 2 sig figs. Follow sig fig rules.
5.31385 mol CO₂ ≈ 5.3 mol CO₂
How does wavelength affect the pitch of a sound?
a. the shorter the wavelength, the lower the pitch
b. the longer the wavelength, the lower the pitch
c. the taller the wavelength, the lower the pitch
d. none of these
Answer:
D
Explanation:
because the higher the wavelength the shorter the pitch and the shorter the wavelength the higher the pitch
(I AM GIVING BRAINLIEST!!!!)
Before there is a transfer of charges between objects, they are uncharged. What does this mean?
A) There are more positive charges than negative charges.
B) There are more negative charges than positive charges.
C) The positive and negative charges are equal.
D) The positive and negative charges do not exist.
Answer:
C) The positive and negative charges are equal.
Explanation:
Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. The correct option are option C.
What is Ions?Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.
Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
Before there is a transfer of charges between objects, they are uncharged as the positive and negative charges are equal.
Therefore the correct option are option C.
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if 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed?
What is the total number of electrons in a S2- jon?
1.
10
2.
14
16
4.
18
the answer is D) 18 electrons
Which metal absorbs the greatest amount of heat energy
Answer:
This question is incomplete but the completed question is in the attachment below. And the correct is b
Explanation:
Specific heat capacity can be defined as the amount of heat required to raise to raise 1 kg of a substance by 1 kelvin. Thus, this means that when the specific heat capacity of a substance is high, it takes more energy to increase the temperature of that substance. This also means that when different substances are subjected to the same amount of heat, the substance with the higher specific heat capacity will absorb less heat; for example at a beach, water has a very high specific heat capacity, thus when the sand in the beach is hot, the beach water is still relatively cold.
From the description above, it can be seen that the metal with the least specific capacity will absorb the greatest amount of heat, thus the metal is lead with the specific heat capacity of 0.129 J/(g. °C).
The ability of an atom in a molecule to attract electrons is best quantified by the ________.
a. electron charge-to-mass ratio
b. electronegativity
c. first ionization potential
d. diamagnetism
e. paramagnetism
Answer:
b. electronegativity
Explanation:
The ability of an atom in a molecule to attract electrons is best quantified by the _Electronegativity_.
Electronegativity is the ability of an atom to attract a shared pair of electron which is loosely held. Polar molecules often possess such properties. The Halogen group (group 17) is famous for such property because it has the highest electronegativity in periodic table.
Which is an example of a beneficial mutation?
one that changes the color of a rabbit, allowing it to hide from predators.
one that results in lighter flower petal colors without changing the plant’s ability to reproduce
one that causes a person’s body to produce thick mucus that clogs the lungs
one that makes it easier for a corn plant to contract a disease
Answer:
A
Explanation:
Answer: a
Explanation: one that changes the color of a rabbit, allowing it to hide from predators.
9) Consider the reaction of C6H6 Br2 C6H5Br HBr a. What is the theoretical yield of C6H5Br if 42.1 g of C6H6 react with 73.0 g of Br2
Answer:
71.7 g of C₆H₅Br are produced at the theoretical yield.
Explanation:
The reaction is:
C₆H₆ + B₂ → C₆H₅Br + HBr
This is an easy excersie, stoichiometry is 1:1
We determine moles of reactants:
42.1 g / 78g/mol = 0.540 moles of benzene
73 g / 159.80 g/mol = 0.457 moles of hydrogen bromide
Certainly, the HBr is the limiting reactant, because I need 0.540 moles of HBr for 0.540 moles of benzene and I only have, 0.457 moles.
0.457 moles of HBr will produce 0.457 of bromobenzene, at the 100 % yield reaction (theoretical yield)
We convert the moles to mass: 0.457 g . 157 g/mol = 71.7 g
The theoretical yield of the reaction has been 0.457 mol.
The balanced chemical equation for the reaction can be given by:
[tex]\rm C_6H_6\;+\;Br_2\;\rightarrow\;C_6H_5Br\;+\;HBr[/tex]
Accordingly, 1 mole of benzene will give 1 mole of Bromobenzene and 1 mole of Hydrobromide.
The moles can be calculated as;
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles in 42.1 grams Benzene:
Moles of Benzene = [tex]\rm \dfrac{42.1}{78}[/tex]
Moles of Benzene = 0.540 mol
Moles of Bromine = [tex]\rm \dfrac{73}{159.80}[/tex]
Moles of Bromine = 0.457 mol.
The limiting reactant in the reaction has been the one that has been present in the lesser quantity as the other reactant to continue to the product formation.
The 1 mole of Benzene requires 1 mole of bromine. So, 0.54 mol of benzene requires. 0.54 mol of bromine. Since the available bromine has been 0.457 mol, Bromine has been the limiting reactant.
The theoretical yield of the reaction will be based on the concentration of Bromine.
Thus, 1 mol of Bromine forms 1 mol of Bromobenzene.
0.457 mol of Bromine will form 0.457 mol of bromobenzene.
The theoretical yield of the reaction has been 0.457 mol.
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Give the name for the molecular compound with the the formula P2I4.
Answer:
Diphosphorus tetraiodide
Explanation:
Diphosphorus tetraiodide is an orange crystalline solid with the formula P2I4. It has been used as a reducing agent in organic chemistry. It is a rare example of a compound with phosphorus in the +2 oxidation state, and can be classified as a subhalide of phosphorus.
Can I please have brainliest?
The name of the molecular compound with the formula [tex]\rm P_2I_4[/tex] is diphosphorus tetraiodide.
The term "compound" refers to two or more elements joined together such that the elements have lost their individual identity in favor of a new set of properties.
The given molecular compound [tex]\rm P_2I_4[/tex] is diphosphorus tetraiodide.
This name is derived from the prefixes "di-" and "tetra-" which indicate that there are two phosphorus atoms and four iodine atoms in the molecule, respectively. The ending "-ide" is used to indicate that the compound is a binary compound consisting of two different elements.Therefore, diphosphorus tetraiodide is the name of the molecular compound with the formula [tex]\rm P_2I_4[/tex] .
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How many liters of fat would have to be removed to result in a 5.2 lb weight loss? The density of human fat is 0.94 g/mL?
The body fat of humans can be measured by the density in grams per mL. The volume of the fat with a density of 0.94 g/mL and mass of 5.2 lb is 2.50 L.
What is volume?The volume is the factor of the dimension that inversely affects the density of the substance. The volume is given by the division of the mass by the density. It can be given in mL or cubic centimeters.
Given,
Mass of body fat = 5.2 lb
Density of human fat = 0.94 g/mL
At first, mass is converted from lb to grams as:
1 lb = 453.592 grams
So, 5.2 lb = 2358.68 grams
Secondly, volume is calculated as:
Volume = Mass ÷ density
V = 2358.68 grams ÷ 0.94 g/mL
= 2509.23 mL
Thirdly, volume from ml is converted to L as:
1 mL = 0.001 L
2509.23 mL = 2.50 L
Therefore, 2.50 liters of body fat has to be removed from the body.
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One mole of an atom of a substance is equal to the:
a Gram atomic mass of the element
b Gram molecular mass of the element
C Atomic number of the element
d None of the above
One mole of an atom of a substance is equal to the gram molecular mass of the element. Therefore, the correct option is option B among all the given options.
What is mole?A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants. One mole of an atom of a substance is equal to the gram molecular mass of the element.
Therefore, the correct option is option B among all the given options.
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A 135 g sample of a metal requires 2.50 kJ to change its temperature from 19.5°C to 95.5°C to 100.0°C?
Answer:
0.23J/g°C
Explanation:
Given parameters:
Mass of sample = 135g
Amount of heat = 2.5kJ
Initial temperature = 19.5°c
Final temperature = 100°C
Unknown:
Specific heat capacity of the metal = ?
Solution:
The specific heat capacity of a substance is the amount of heat required to the raise the temperature of 1g of the substance by 1°C.
H = m C (T₂ - T₁ )
H is the amount of heat
m is the mass
C is the specific heat capacity
T₂ is the final temperature
T₁ is the initial temperature;
2.5 x 10³ = 135 x C x (100 - 19.5)
2500 = 10867.5C
C = [tex]\frac{2500}{10867.5}[/tex] = 0.23J/g°C
If 2.50 ml of vinegar requires 34.50 ml of 0.0960 M NaOH to reach the equivalence point in a titration, how many grams of acetic acid are in 500.0 ml of this vinegar? Density of vinegar=1.01 g ml
Grams of acetic acid in 500 ml vinegar=39.744 g
Further explanationTitration (equivalence point⇒mol acid(CH₃COOH)=mol base(NaOH))
M₁V₁n₁=M₂V₂n₂(n=valence acid/base, for CH₃COOH and NaOH=1)
[tex]\tt M_1\times 2.5\times 1=0.0960\times 34.5\times 1\\\\M_1(acetic~acid)=1.3248~mol/L[/tex]
For MW CH₃COOH = 60 g/mol, mass of acetic acid in 1 L :
[tex]\tt 1.3428~mol/L\times 60~g/mol=79.488~g/L[/tex]
for 500 ml :
[tex]\tt 79.488\times 0.5~L=39.744~g[/tex]
The mass of vinegar present in 500mL of solution is 39.6 g.
Concentration of acid (CA) = ?
Volume of acid(VA) = 2.50 ml
Concentration of base (CB) =0.0960 M
Volume of base (VB) = 34.50 ml
Number of moles of acid = 1
Number of moles of base = 1
Equation of the reaction;
CH3COOH (aq) + NaOH(aq) ------> CH3COONa(aq) + H2O(l)
From CAVA/CBVB = NA/NB
CAVANB = CBVBNA
CA = CBVBNA/VANB
CA = 0.0960 × 34.50 × 1/2.50 × 1
CA = 1.32 M
Number of moles = concentration × volume
Number of moles = 1.32 M × 500/1000
Number of moles = 0.66 moles
Number of moles = mass/molar mass
Mass = Number of moles × molar mass
Molar mass of acetic acid = 60 g/mol
Mass = 0.66 moles × 60 g/mol
Mass = 39.6 g
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A mass scale reads 10 kilograms on earth, what would it read on the moon?
The total length of
mid-ocean ridge spreading centers is about 80,000 km. The average
spreading rate of ridges is 1.25 cm/yr. Calculate the area of new
ocean crust that forms each year.
Answer: In fact, all of the major landforms that we find on the continents ... Mid-ocean ridges, also called seafloor-spreading centers, are long, ... 1 km = 100,000 cm or 1 x 105 cm ... a mid-ocean ridge with a SLOW spreading rate (1 to 5 cm/yr, full rate).
Explanation:
As the Earth's tectonic plates separate, new ocean bottom is generated along divergent plate borders, which are known as mid-ocean ridges. Massive basalt volcanic eruptions result from molten rock rising to the seafloor as the plates divide.
What is mid-ocean ridge?A mid-ocean ridge is a system of seafloor mountains formed by plate tectonics. It is typically about 2,600 meters deep and rises about 2,000 meters above the deepest part of an ocean basin. This feature occurs when seafloor spreading occurs along a divergent plate boundary. Mid-ocean ridges are geologically significant because they occur along the type of plate boundary that creates new ocean floor as the plates spread apart. As a result, the mid-ocean ridge is also referred to as a "spreading center" or a "divergent plate boundary." The plates separated at rates ranging from 1 cm to 20 cm per year.To learn more about Mid-ocean ridge, refer to:
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What term describes the state of matter in which the attractive forces between particles are the greatest?
liquid
solid
gas
metal
Answer:
I think it would be b
Explanation:
Not sure what to do here. It says to convert the following into formulas and states in an unbalanced equation. Please help!
Answer:
Ca2 solid state
H2O liquid state
Ca(OH)2 I believe this would be in solid state
H2 gas state
Explanation:
Why doesn’t the reaction: Br2(aq) + 2NaCl(aq) → Cl2(aq) + 2NaBr(aq) occur? In other words, why don’t the two Br atoms stop sharing an e pair with each other to exist as Br2 and each take an e from the available two Cl ions instead? Answer with respect to the relative E.A. values for Cl and Br. /2
Answer:
Chlorine has higher Electron Affinity as compared to Bromine
Explanation:
Electron affinity is defined as the Potential energy change of the atom when an electron is added to a neutral gaseous atom. Therefore, more the Negative electron affinity, more favorable will be the electron addition process.
The electron affinity of Chlorine is -349kJmol^-1
The electron affinity of Bromine is -324.6KJmol^-1
This clearly shows that Chlorine is a much better Atom to be bonded with, That is the reason why in the reaction is not feasible.
[tex]Br2(aq) + 2NaCl(aq)[/tex] →[tex]Cl2(aq) + 2NaBr(aq)[/tex]
Therefore, Chlorine has higher electron Affinity as compared to Bromine and that what makes it a much better atom to be bonded with Na. So the above reaction is not possible.
7. A gas takes up a volume of 15 liters, has a pressure of 3.3 atm, and a temperature of 299 K. If I raise the
temperature to 350 K and lower the pressure to 1050 mmHg, what is the new volume of the gas?
8. I have an unknown volume of gas held at a temperature of 115 K in a container with a pressure of 60.0
atm. If by increasing the temperature to 225 K and decreasing the pressure to 30.0 atm causes the volume
of the gas to be 25 liters, how many liters of gas did I start with?
9. A gas has a temperature of 14oC, and a volume of 5.5 liters. If the temperature is raised to 29oC and the
pressure is not changed, what is the new volume of the gas?
10. A gas that has a volume of 28 liters, a temperature of 65oC, and an unknown pressure has its volume
increased to 36 liters and its temperature decreased to 35oC. If I measure the pressure after the change to
be 2.0 atm, what was the original pressure of the gas?
Answer:
See explanation
Explanation:
7) P1 =3.3 atm
V1= 15 litres
T1 = 299 K
T2 = 350 K
P2 = 1050 mmHg/760 = 1.38 atm
V2?
From;
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
V2 = P1V1T2/P2T1
V2 = 3.3 * 15 * 350/1.38 * 299
V2 = 17325/412.62
V2 = 42 litres
8) V1= unknown
T1= 115 K
P1 = 60 atm
T2= 225 K
P2 = 30 atm
V2 = 25 litres
From;
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
V1 = P2V2T1/P1T2
V1 = 30 * 25 * 115/ 60 * 225
V1 = 86250/13500
V1 = 6.4 litres
9) T1 = 14 + 273 = 287 K
V1 = 5.5 liters
T2 = 29 + 273 = 302 K
V2 = the unknown
From Charles law;
V1/T1 = V2/T2
V1T2 = V2T1
V2 =V1T2/T1
V2 = 5.5 * 302/ 287
V2 = 5.8 litres
10) V1= 28 litres
T1= 65 + 273 = 338 K
P1 = the unknown
V2 = 36 liters
T2 = 35 + 273 = 308 K
P2 = 2 atm
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
P1 = P2V2T1/V1T2
P1 = 2 * 36 * 338/ 28 * 308
P1 = 24336/8624
P1 = 2.82 atm
A nurse practitioner orders Medrol to be given 1.4 mg/kg of body weight. Medrol is an anti-inflammatory administered as an intramuscular injection. If a child weighs 71.6 lb and the available stock of Medrol is 20. mg/mL, how many milliliters does the nurse administer to the child? Express your answer to two significant figures and include the appropriate units.
The nurse give 2.3 ml Medrol to the child
Further explanationMass is one of the principal quantities, which is related to the matter in the object
The main mass unit consists of 7 units
kg, hg, dag, g, dg, cg, mg
Conversion :
1 Lb=0,453592 kg
For 71.6 lb :
[tex]\tt 71.6\times 0.453592=32.48~kg[/tex]
Medrol to be given 1.4 mg/kg of body weight, so amount for the child :
[tex]\tt 32.48~kg\times 1.4~mg/kg=45.472~mg[/tex]
The available stock of Medrol is 20. mg/mL, so the volume to the child :
[tex]\tt \dfrac{45.472}{20}=2.2736\approx2.3~ml[/tex]
What is the expected major organic product from the treatment of 4-methyl-2-pentyne with excess hydrogen in the presence of a platinum catalyst?
a. (E)-4-methyl-2-pentene
b. (Z)-4-methyl-2-pentene
c. (E)-2-methyl-2-pentene
d. (Z)-2-methyl-2-pentene
e. 2-methylpentene
Answer:
(Z)-4-methyl-2-pentene
Explanation:
Hydrogenation is a syn addition. This implies that the hydrogen atoms add to the same face of the multiple bond.
Hence, if we have the alkyne, 4-methyl-2-pentyne which reacts with excess hydrogen in the presence of a platinum catalyst, we obtain (Z)-4-methyl-2-pentene since the hydrogen atoms add on the same side of the multiple bond.
WHAT PROBLEMS DID PRESIDENT JEFFERSON HAVE WITH TRIPOLI AND HOW DID HE SOLVE THEM
Answer:
Although Thomas Jefferson came to power determined to limit the reach of the federal government, foreign affairs dominated his presidency and pushed him toward Federalist policies that greatly contrasted with his political philosophy. The first foreign episode involved Jefferson's war with the Barbary pirates. For the previous century or so, Western nations had paid bribes to the Barbary states, which would later become Morocco, Algeria, Tunis, and Tripolitania, to keep them from harassing American and merchant ships
Explanation:
With ionic compounds, the ion charge is the same as the ___ number.
A. methylation
B. anion
C. cation
D. oxidation
Answer:
D. Oxidation
Explanation:
The oxidation state of a pure element is always equal to zero and the oxidation state for a pure ion is equivalent to its ionic charge.
Xavier boiled 19 grams of water. If all of the water changed into a gas, what would be the mass of the steam?
Answer:
19g
Explanation:
The mass of the steam produced in this phase change process will also be 19g. This is in compliance with the law of conservation of mass.
It states that "mass is neither created nor destroyed in a the cause of reaction". The law suggests that mass is conserved. When steam is heated, it does not lose its mass. The mass of the steam is still the same as that of water.Answer:
Xavier boiled 14 grams of water. If all of the water changed into a gas, what would be the mass of the steam?
A.
28 g
B.
0 g
C.
24 g
D.
14g
Explanation:
The isotope of carbon used in archaeological dating is 14^6C . How many protons, neutrons, and electrons does an atom of 14^6C have?
Answer:
6
8
6
Explanation:
Isotope given:
¹⁴₆C
In specie written as this;
Superscript = Mass number
Subscript = Atomic number
To find the protons, it is the same as the atomic number;
Protons = Atomic number = 6
Neutrons have no charges;
Neutrons = Mass number - Atomic number =
Neutrons = 14 - 6 = 8
The number of electrons is the same as the atomic number = 6
How much ice could be melted at 0°C if 5200 joules of heat were added?
Answer:
0.02kg
Explanation:
Given parameters:
Amount of heat = 5200J
Unknown:
Mass of ice that would be melted at 0°C = ?
Solution:
To solve this problem, use the expression below;
H = mL
H is the heat
m is the mass
L is the latent heat of fusion of ice = 3.33 x 10⁵ J/kg.
Insert the parameters and solve for m;
5200 = m x 3.3 x 10⁵
m = [tex]\frac{5200}{3.33 x 10^{5} }[/tex] = 0.02kg
Electromagnetic waves are ? and have ?
more energy moving from left to right on the electromagnetic
Electromagnetic waves are
radiation diagram
shorter/less
o longer/more
shorter/more
longer/less
Answer:
longer/less
Explanation:
In moving from left to right on the periodic table, electromagnetic waves have longer wavelength and less energy.
The electromagnetic radiation diagram is made up of electromagnetic waves.
From left to right, the energy of the wave decreases. Waves at the left most edge have the highest energy. As we move rightward, the wavelength also becomes longer. The frequency also reduces. Wavelength and energy are inversely proportional.Which statement describes effusion?
It occurs when a gas passes through a tiny hole.
It occurs when a liquid passes through a tiny hole.
It occurs when gas molecules disperse throughout a container.
It occurs when a liquid disperses throughout a container.
Answer:
A. It occurs when a gas passes through a tiny hole.
Explanation:
Edge2020
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What is Scrooge’s “business” according to his interaction with the men? Why does he feel this way
Answer:
Ebenezer Scrooge's business is to take care of his own establishment and thus, refused to donate/ contribute any to the charity.
He feels this way because he thinks that it is not one's business to interfere in another's business.
Explanation:
Charles Dickens's play "A Christmas Carol," tells the story of the protagonist Ebenezer Scrooge and his 'hatred' of the Christmas festival. But it was during this time of the year that he got 'inspired' by the ghost of his late partner c um friend Marley, teaching him a life lesson that changed Scrooge for the better.
When the two gentlemen came to visit the workplace of Scrooge expecting some donation for charity, Scrooge refused to give a single penny. According to him, the suffering of the people and their need is none of his business. He exclaims "I don’t make merry myself at Christmas and I can’t afford to make idle people merry. I help to support the establishments I have mentioned—they cost enough; and those who are badly off must go there." Rather, his business is to take care of his company, which "occupies [him] constantly" and thus, it's not his business to "not to interfere with other people’s".
he felt this way because he thinks that it is "unfair" and unbecoming to get involved in someone's business.