Answer:
A mole is an amount of a substance that contains 6.022✖️10^22 atoms of that substance
Or
Gram atomic masses,gram formula masses or gram formula masses are called one mole.
Molar solution or molarity is defined as the number of miles of so lutes dissolved per dm^3 of solution
Explanation:
I hope this will help you :)
A glass cup of orange juice is found to have pOH of 11.40. Calculate the concentration of the hydrogen ions in the juice.
Answer: The concentration of hydrogen ion is 2.5 x 10∧-3.
Explanation:
It is well known that; pH + pOH = 14
∴ pH + 11.40 = 14
pH = 14 -11.40 = 2.60
Remember that,
pH = - Log [ H+ ]
2.60 = - log [H+]
To get the hydrogen ion concentration, we take the anti-log of 2.60.
[H+] = Antilog 2.60 = 2.5 x 10∧-3.
A chemist dissolves 0.9 g of an unknown monoprotic (one acidic H) acid in water. She finds that 14.6 mL of 0.426 M NaOH are required to neutralize the acid.
Answer:
144.7 g/mol would be the molar mass of the monoprotic acid
Explanation:
We can find the molar mass of the monoprotic acid from the data showed in the excersie. As every titration we can say that:
mEq acid = mEq base
mEq acid = 14.6 mL . 0.426 M
mEq acid = 6.2196 mEq
mEq = Volume (mL) . N = mass (g) / (EQ / 1000), where the EQ is the:
Molar weight / valence. For this case, as the acid is a monoprotic one, we assume Molar Weight = EQ
6.2196 mEq = 0.9 g / (EQ / 1000)
6.2196 mEq . EQ/1000 = 0.9 g
EQ = 0.9 g / 6.2196×10⁻³ = 144.7 g/mol
___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.
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
Answer:
according to quantum physics newtons 3rd law is in the state of nuclear power things so the answer is c
Explanation:
according to quantum physics newtons 3rd law is in the state of nuclear power things so the answer is c
Explain how to arrange the following in increasing order of atomic size/radius: Al, C, Si
Answer:
C, Si, Al
Explanation:
We use periodic trends to help us find the atomic radii. The trend for atomic radii on the Periodic Table of Elements is down and to the left. So whichever elements are furthest to the left and farthest down have the largest atomic radii.
What conclusion did Rutherford draw from his gold-foil experiment? A. Almost all the mass of an atom is concentrated in the nucleus. B. Atoms contain three different subatomic particles. C. Electrons are tiny particles that carry a negative charge. D. The mass of a proton is nearly equal to the mass of a neutron.
Answer:
A. Almost all of the mass is concentrated in the nucleus.
Explanation:
Because when he shot the alpha particles towards the atoms, most passed through (which meant atom is mostly empty space), but some bounced back and such (which meant mass is concentrated in the nucleus.)
The reason they bounced is because alpha particles are postive and nucleus is positive as well, and we know positives don't attract, rather they repel thus they bounced.
Jack tries to place magnets on his refrigerator at home, but they won’t stick. What could be the reason?
Answer:
The reason might be that the material that the fridge is made out of is not magnetic, meaning that it's not attracted to metal.
The initial temperature of a bomb calorimeter is 28.50°C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45°C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(gi°C), how much heat is absorbed by the reaction?
Answer:
D. 5,170 J
Explanation:
A sample of gas is found to occupy a volume of 900cm^3 at 27 degree Celsius, calculate the temperature at which it will occupy a volume of 300cm^3, provided the pressure is kept constant.
Answer:
Explanation:
Here, V1=900cm3, V2=300cm3
T1=(27+273)K=300K, T2=?
Applying Charles's law,
V1T1=V2T2
∴T2=V2T1V1=300cm3×300K900cm3=100K
=100−273=−173∘C
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Electrical potential is the amount of energy that is available to do what?
A.
attract atoms to each other
B.
move atoms from one half cell to another half cell
C.
move electrons from anode to cathode
D.
move electrons from cathode to anode
C.
move electrons from anode to cathode
Step-by-step Explanation
Electrical potential is the amount of energy that is available to move electrons from anode to cathode
Answer:
move electrons from anode to cathode
Explanation:
Plato
The element has protons and neutrons
Answer:
All elements have protons and neutrons.
Explanation:
Sure, some standard norms of elements don't have neutrons present (like hydrogen), but different forms of hydrogen have neutrons. Neutrons can and are present in every element in the Periodic Table of Elements.
Molecular formula of ammonia
Answer:
NH3 is the molecular formula of ammonia
Explanation:
i hope this will help you :)
Why does a perfume bottle burst when placed inside the flame?
Answer:
Explanation:
It is because they contain ethyl alcohol and they are inflammable. The perfume contains alcoholic substances like the ethyl alcohol or the ethanol. After reaching the flash point,the combustion of ethanol takes place inside the bottle and the internal combustion created pressure causes explosion.
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Answer:
because they contain ethyl alcohol and they are inflammable.
What atom should be balanced last when balancing hydrocarbon combustion
reactions?
A. The oxygen atoms
B. The carbon atoms
C. Any of the three
D. The hydrogen atoms
Answer:
A. The oxygen atoms
Explanation:
A hydrocarbon combustion reaction consist of carbon, hydrogen and oxygen. In balancing the hydrocarbon combustion reaction at first carbon and hydrogen atoms are balanced and at last oxygen atoms are balanced.
Oxygen atoms are balanced at the end because oxygen atom stand alone as O2 and easier to balance than hydrogen and carbon.
Hence, the correct option is "A".
what is meant by amoeba and what is the name of its parts
Answer:
amoeba is the unicellular organism which can be seen by only microscope but not with our nacked eyes
Answer:
An amoeba often called an amoeboid, is a type of cell or unicellular organism which has the ability to alter its shape, primarily by extending and retracting pseudopods Amoebae do not form a single taxonomic group; instead, they are found in every major lineage of eukaryotic organisms. Amoeboid cells occur not only among the protozoa, but also in fungi, algae, and animals.
name of parts of ameoba
3 parts – the cytoplasm, plasma membrane and the nucleus. The cytoplasm can be differentiated into 2 layers – the outer ectoplasm and the inner endoplasm. The plasma membrane is a very thin, double-layered membrane composed of protein and lipid molecule
i hope this will help you
what is the mass of 1.5 mol of aluminum?
Answer:
40.47 g Al
Explanation:
In 1 mol of Al, there are 26.98 grams of Al, so Al is 26.98 g/mol.
Simply multiply 1.5 by 26.98 to get your answer.
Considere uma molécula de glicose (C6H12O6) e indique: a-) O número de átomos de carbono_____________________ b-) O número de átomos de hidrogênio __________________ c-) O número de átomos de oxigênio ___________________ d-) Quantos átomos teremos ao todo se tivermos 8 moléculas dessa substância? _______ e-) Quantos átomos teremos de cada elemento com 20 moléculas de glicose
Answer:
Considere uma molécula de glicose (C6H12O6) e indique: a-) O número de átomos de carbono = 6 b-) O número de átomos de hidrogênio = 12 c-) O número de átomos de oxigênio = 6d-) Quantos átomos teremos quando descubro se temos 8 moléculas dessa substância?
48 oxigênio, 48 carbono e 96 hidrogênio e-) Quantos átomos de cada elemento teremos com 20 moléculas de glicose?
160 de oxigênio e carbono e 240 de hidrogênio.
Explanation:
A glicose é uma das moléculas mais usadas no organismo humano, pois é uma molécula em que sua decomposição é muito mais fácil que os aminoácidos, portanto, eles produzem como produto a moeda de energia que é ATP mais facilmente do que outros alimentos .
A glicose não é encontrada apenas em alimentos açucarados, isso é um mito, na verdade é a unidade de carboidratos (de assados a doces)
HELP! 10 points rewarded, plus, best answer gets BAINLIEST!!
Answer:
4.08 grams
Explanation:
Essentially, we're looking for the mass of HCl that "matches" 3.26 grams of magnesium hydroxide.
First, convert 3.26 grams of [tex]Mg(OH)_2[/tex] into moles by dividing by the molar mass. The molar mass of [tex]Mg(OH)_2[/tex] is 24.3 + 16 * 2 + 1 * 2 = 58.3 g/mol. So, 3.26 grams is equal to:
3.26 g ÷ 58.3 g/mol = 0.0559 mol [tex]Mg(OH)_2[/tex]
Notice that from the chemical equation, magnesium hydroxide and hydrochloric acid (HCl) have a ratio of 1 to 2. In other words, for every 0.0559 moles of [tex]Mg(OH)_2[/tex], there are 0.0559 * 2 = 0.112 moles of HCl.
Finally, convert moles of HCl to grams by multiplying 0.112 by the molar mass, which is 1 + 35.45 = 36.45 g/mol:
0.112 mol HCl * 36.45 g/mol = 4.08 g HCl
The answer is thus 4.08 grams.
~ an aesthetics lover
20
What is the name of this compound?
OH
CH3-CH3 -CH 2 -CH2-CH-CH2
Isohexyl alcohol
hexyl alcohol
tert-hexyl alcohol
sec-hexyl alcohol
tret-hexyl alcohol
Explanation:
its formula is CH3-CH3-CH2-CH2-CH-CH2
What is the relationship between the period and the orbital radius? Select one: a. It is a direct relationship- As the period increases the orbital radius also increases. b. It is an inverse relationship- As the period increases the orbital radius decreases.
I'm pretty sure it's A, but then again I'm only in 8th grade. Sorry if this doesn't help:(
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.
When sugar is added to a sugar solution, the sugar does not dissolve. Which
term describes the original sugar solution?
O A. Semisaturated
O B. Supersaturated
C. Saturated
D. Unsaturated
Answer:Supersaturated
Explanation:The answer is supersaturated because supersaturation is a solution that contains more than the maximum amount of solute that is capable of being dissolved at a given temperature. It is supersaturated because there is already a sugar solution and adding another sugar is more than the maximum amount of solute.
newborn reflexes... A. are consciously controlled behaviors B. are unique to each individual newborn C. have little impact on development D. contribute to infant survival
Answer:
The correct answer to the following question will be Option B.
Explanation:
To survive, newborns don't require reflexes. Even though their perceptions were already improving performance, they don't rely on visual stimulation because it was too abstract for them so you can't even guess whose stimulus they're going comes to choosing.The reflexes between each child are special. Each one of them has its own.For instance, its action has always been designed to suck quickly.
Some other choices being made aren't linked to the circumstance. The second Scenario would have been the right choice.
Consider an electrochemical cell based on the spontaneous reaction 2AgCl(s) + Zn(s) → 2Ag(s) + 2Cl– + Zn2+. If the zinc ion concentration is kept constant at 1 M, and the chlorine ion concentration is decreased from 1 M to 0.001 M, the cell voltage should:
Answer:
there is an increase by 0.18 V in the cell voltage.
Explanation:
The given equation of the reaction can be well written as
[tex]2AgCl_{(s)} + Zn _{(s)} \to 2Ag_{(s)} + 2 Cl^- _{(aq)}+ Zn^{2+}_{(aq)}[/tex]
By application of Nernst Equation ; we have the expression
[tex]E_{cell} = E^0- \dfrac{0,059}{n}log (\dfrac{[product]}{[reactant]})[/tex]
here in the above equation;
n = number of electrons transferred in the equation of the reaction
n = 2
Also;
[tex]E^0 = E_{cathode} - E_{anode}[/tex]
[tex]E^0 = E_{Ag^+/Ag} - E_{Zn^+/Zn}[/tex]
[tex]E^0 = +(0.80 \ V) - (-0..76 \ V)[/tex]
[tex]E^0 = (0.80 \ V +0..76 \ V)[/tex]
[tex]E^0 = 1.56 \ V[/tex]
If the zinc ion concentration is kept constant at 1 M; we have:
[tex]E_{cell} = E^0- \dfrac{0.059}{n}log (\dfrac{[product]}{[reactant]})[/tex]
[tex]E_{cell} = 1.56 - \dfrac{0.059}{2}log ({[Zn^{2+} ]}{[Cl^{2-}]})[/tex]
[tex]E_{cell} = 1.56 - \dfrac{0.059}{2}log (1)[/tex]
Since log(1) = 0
Therefore;
[tex]E_{cell} = 1.56\ V[/tex]
When the chlorine ion concentration is decreased from 1 M to 0.001 M; we have;
[tex]E_{cell} = E^0- \dfrac{0.059}{n}log (\dfrac{[product]}{[reactant]})[/tex]
[tex]E_{cell} = 1.56 - \dfrac{0.059}{2}log ({[Zn^{2+} ]}{[Cl^{2-}]})[/tex]
[tex]E_{cell} = 1.56 - \dfrac{0.059}{2}log ({[1*0.001^2}]})[/tex]
[tex]E_{cell} = 1.56 - 0.0295 \ * \ log ({[1*10^{-6}}]})[/tex]
[tex]E_{cell} = + 1.737 \ V[/tex]
The change in voltage = [tex]E_{cell} - E^0[/tex]
=( 1.737 - 1.56 )V
= 0.177 V
≅ 0.18 V
Thus; from the following observation; there is an increase by 0.18 V in the cell voltage.
The voltage of the cell increased by 0.18 V.
The equation of the reaction is; 2AgCl(s) + Zn(s) → 2Ag(s) + 2Cl– + Zn2+
We know that;
E°cell = 1.36 - (-0.76) = 2.12 V
If the cells are both at 1M concentration the Ecell = E°cell = 2.12 V
When the concentration of Cl- decreased from 1 M to 0.001 M
Ecell = E°cell - 0.0592/n log Q
Substituting values;
Ecell = 2.12 V - 0.0592/2 log (1 × (0.001)^2)
Ecell = 2.298 V
Increase in voltage = 2.298 V - 2.12 V = 0.18 V
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Describe the structure and bonding in graphite.
Answer:
In graphite, each carbon atom is covalently bonded to 3 other carbon atoms. ... These extra electrons are delocalised, or free to move, in the area between layers of carbon atoms. As these electrons are free to move they are able to carry charge and thus graphite can conduct electricity.
Explanation:
Graphite has a layered structure, with each layer consisting of a two-dimensional hexagonal lattice of carbon atoms. Within each layer, carbon atoms are covalently bonded in a flat, trigonal planar arrangement, forming strong σ bonds.
What is graphite?In graphite, carbon atoms are arranged in a flat, hexagonal lattice within each layer, forming strong covalent σ bonds. These layers are stacked on top of each other, held together by weaker van der Waals forces, which allow for easy slippage.
The presence of π bonds between the carbon atoms in each layer results in delocalized π electrons above and below the plane, creating a "sea" of mobile electrons. This delocalization gives graphite its remarkable properties, including electrical conductivity and lubrication.
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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.
1) In 1.31 g of a chloride of titanium, there is 0.528 g of titanium. What is the empirical formula of this titanium chloride?
Answer:
TiCl2
Explanation:
Mass of the chloride of titanium= 1.31 g
Mass of titanium= 0.528 g
Therefore mass of chlorine = 1.31-0.528 = 0.782 g
To determine the empirical formulae of the titanium chloride, divide the mass of each element by its relative atomic mass and divide through by the lowest ratio.
Ti- 0.528/48 = 0.011, Cl- 0.782/35.5 = 0.022
Ti- 0.011/0.011 , Cl- 0.022/0.011
Ti- 1, Cl-2
Hence the required empirical formula is TiCl2
Which consists of only one type of atom?
Answer:
A chemical element
Explanation:
A chemical element consists of only one type of atom.
What mass of nickel (Ni) is in a 2.4 Kg sample of propanol if the concentration is 20 ppb ? (atomic mass of Ni = 58.69)
Answer:
The mass of nickel is 48μg
Explanation:
Parts per billion is a way to describe small concentrations and is defined as the ratio between μg of solute and kg of solvent.
If a solution of nickel in propanol is 20ppb, contains 20μg of nickel in 1 kg of propanol.
Thus, a sample of 2.4kg of propanol will contain:
2.4kg × (20μg nickel / 1kg) = 48μg nickel
The mass of nickel is 48μgWhich refers to the force that one massive object exerts to attract another object? velocity gravity acceleration newton
Answer:
gravity is the correct answer to the given question .
Explanation:
The gravity is the gravitational force due to the gravitational the solar system as well as the other body of dimensional object to its center point. The gravitational force maintains all the planetary systems in the orbit over the sun.We can called gravitational force as the universal force .
The gravitational force attracts the huge object for grabbing the another object.All the other option are not attracting the another object that's why these are incorrect option .Answer:
the answer is b gravity :)
Explanation:
u got this :)