Answer:
889.4 g of Al are produced in the decomposition of 444.71 g of Al₂O₃
Explanation:
This is the reaction of decomposition:
2Al₂O₃ → 4Al + 3O₂
2 moles of aluminum oxide decompose to 4 moles of Al and 3 moles and oxygen.
We convert the mass to moles:
444.71 g . 1mol /26.98g = 16.48 moles.
Now, we can apply the rule of three:
2 moles of Al₂O₃ decompose to 4 moles of Al
Then, 16.48 moles of Al₂O₃ may decompose to (16.48 . 4) /2 = 32.9 moles.
We convert the moles to mass:
32.9 mol . 26.98 g/ mol = 889.4 g
What is the number of copper atom in one naira coin which weight is 7.3g a sum of the material is 86%
Answer:
5.9x10²² atoms of Cu are in one naira coin
Explanation:
To solve this question we need to find the mass of Copper. Then, using its molar mass (Cu = 63.546g/mol) we must find the moles of Cu and its atoms using Avogadro's number:
Mass Cu:
7.3g * 86% = 6.278g is the mass of Cu.
Moles Cu:
6.278g * (1mol / 63.546g) = 0.099moles Cu
Atoms Cu:
0.099moles Cu * (6.022x10²³atoms / 1mol) =
5.9x10²² atoms of Cu are in one naira coinHELP MEEE PLEASEEEEE
Answer:
A has the highest concentration
Explanation:
I'll simply explain it this way;
get a color pour the whole color in a solution in container A then add a little drop in the another container(B).
you'll find out that the first container has a thicker color than container B the same thing goes for this, Beaker A has a thick looking color unlike the rest.
Within a period, the nuclear charge increases as you move from left to right across the
periodic table. Again, in one sentence explain the reason for this increase. Be sure to
use your own words. PLEASE HELP
Answer:
The answer is Ionization energy.
Explanation:
Ionization Energy. The ionization energy tends to increase as one moves from left to right across a given period or up a group in the periodic table.
For each pair of gases, select the one that most likely has the highest rate of effusion. Use the
periodic table if necessary.
Oxygen (02) or hydrogen (H2):
Answer:
hydrogen has the highest rate of effusion
.What is the KE of a baseball that has a mass of 100 kg and is traveling at 5 m/s?
Answer:
1250joules
Explanation:
The kinetic energy is energy in motion and it's formula is
KE =1/2MV^2
M represent mass which is 100Kg.
V represent velocity which is 5m/s
Therefore, KE = 1/2×100×5× 5
= 50 × 25
KE= 1250joules
What are the three (3) things involved in stoichiometry problems???
Answer:
Molar Mass (moles
⇌
grams)
Stoichiometric Coefficients (moles )
Avagadro's number
Explanation:
The number of energy levels is determined by the
a. groups
b. periods
c. valence electrons
d. atomic mass number
Answer:
The answer is C
Explanation:
I did look it up, the other kid just spams random bs for points, hope you didn't get it wrong because of him! :)
What does RNA do?
Group of answer choices
A.make proteins
B.carries codes out of the nucleus
C.controls traits
Answer:
b, its a polymer that translates genetic information.
Give an example of a system that has energy.
Answer:
Aerobic Energy System
Explanation:
Answer:
Digestive system. It contains chemical energy. The digestive system breaks down food. Food contains chemical energy. To break down the food, the digestive system contains enzymes. Enzymes have kinetic energy to move and break down the food. They are biological catalysts. They transfer to the thermal energy store since in order to break down food at the fastest rate, they need to be at an optimum temperature.
I'm not sure if it's correct, but I'll provide some energy stores to give you inspiration:
Kinetic energy
Chemical energy
Nuclear energy
Gravitational potential energy
Elastic potential energy
Thermal energy
Which of the substances has a higher boiling point: H20 or H2S? Justify your
answer in detail.
Your answer
Which of the substances has a higher boiling point: NaCl or HF? Justify your
answer in detail.
pls answer i will mark as branliest im timed
Answer:
H2O
Explanation:
Water has a higher b.p because it contains hydrogen bonding which is stronger than than the dipole-dipole bonds in hydrogen sulfide
Which of the following best describes a force that acts between two objects?
A. Static electricity
B. Combustion
C. Charge separation
D. Gravity
Answer:
D would be the best answer
Explanation:
Among the given options example of force acting between two objects is gravity by which an object attracts other objects into its center of mass.
What is force?Force is an external agent acting on a body to change it state or motion or rest or to deform it. There are different kinds of forces such as, gravitational force, frictional force, nuclear , magnetic force etc.
Gravitational force is the force by which an object attracts other objects into its center of mass. Earth attracts every objects on its surface into it. This effect is called gravity.
Force of gravitation depends on the mass of both objects and distance between them. Greater the mass, greater will be the force of gravity exerted on it. Thus, option D is correct.
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If you begin with 4.0 grams of hydrogen and all of the oxygen that you need, how many grams of water can you make?
the water is 36 grams.
hope this helped
ASAPPP HELP!!!! NO LINKS
Ammonia (NH3) dissolved in water is heated in a beaker. If initially there had been 60 grams dissolved in 100 grams of water, what would happen if the temperature reached 90℃ and why? (AKS 6c DOK 2)
A.
The solution would become supersaturated and the ammonia would all remain dissolved .
B.
The solution would become saturated but the amount of ammonia dissolved would remain the same .
C.
about 50 more grams of ammonia would be able to dissolve as the solution has become unsaturated .
D.
about 50 grams of ammonia would come out of solution as the temperature caused the solubility to decrease .
Answer:
oh man i haven't taken chemistry but i've seen questions similar to this and i think it's B????? I'm not positive
Explanation:
b) Explain the importance of photosynthesis for plants.
Answer:
Green plants and trees use photosynthesis to make food from sunlight, carbon dioxide and water in the atmosphere: It is their primary source of energy. The importance of photosynthesis in our life is the oxygen it produces. Without photosynthesis there would be little to no oxygen on the planet.
When water is separated into its elements what will be the ratio?
Answer:
IT îs said that the cell separarea water into its constituent elemente hidrogen and oxigen . Turn the hidrogen will ne burned ți obtain energy nu restoring the water molecules.
HELP ME PLEASE. Each answer needs to be one paragraph. 1. Do burning fossil fuels and the CO2 levels in the atmosphere correspond at all? 2. Do cars affect global warming? 3. Do greenhouse gasses affect global warming?
This question is about metal oxides. When sodium is heated in oxygen, sodium oxide is produced.
Na + O2 ⟶ 2 Na2O
How many atoms of Na are required to balance this equation
Answer:
This is very easy Cuz We have 2Na2O We have O2 so thats molecule of Oxygen and its same on product We need to balance Na on start We have 1 on product We have 2 so Just put 2 at start....
Explanation:
Sorry for bad english not my first language :(
2Na+O2-->2Na20
2Na3PO4 + 3CaCl2 --> 6NaCl + Ca3(PO) 2
2. Use the balanced equation below to answer the following question.
2 Al + 6 HCl → 2 AICI+ 3 Ha
How many moles of AICI, will be produced if 3.52 x 1025 molecules of HCl react completely?
Identify the daughter isotope in this nuclear reaction: Superscript 222 subscript 88 upper R a right arrow superscript 218 subscript 86 R n plus superscript 4 subscript 2 upper H e. Which is the daughter isotope? Superscript 218 subscript 86 R n. Superscript 4 subscript 2 upper H e. Superscript 222 subscript 88 upper R a.
The daughter isotope which is present in the given radioactive decay is ²¹⁸₈₆R.
What is daughter isotope?A daughter isotope is the isotope that remains following the radioactive decay of an original isotope.
In the question parent nuclei is given that ²²²₈₈R, and given chemical equation is:
²²²₈₈R → ²¹⁸₈₆R + ⁴₂He
In the above equation ²¹⁸₈₆R is the daughter nuclei and ⁴₂He is the emitted particle or rays.
Hence ²¹⁸₈₆R is the daughter isotope.
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Answer:
222 88Ra
Explanation:
NEED HELP ASAP WILL GIVE BRAINIEST
What best describes a mixture
Answer:
In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. ... A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
When naming the second nonmetal in a covalent molecule, the numerical value is indicated by a __.
Answer:
roman numeral
Explanation:
The number of collisions between the particles of hydrogen and nitrogen is increased by using high
pressure and _______
What one word completes the sentence?
Answer:
temperature
Explanation:
increase in temperature increases the rate of reaction
A molecule with two atoms and no lone pairs around the central atom has a
shape.
A molecule with four atoms and no lone pairs around the central atom has a
shape.
A molecule that has two atoms and two lone pairs around the central atom has a
shape.
A molecule that has five atoms and no lone pairs around the central atom has a
shape.
DONE
Answer: linear
tetrahedral
bent
trigonal bipyramidal
Explanation:
When there are two atoms around the central atom and no lone pair of electrons, the number of electron pairs will be 2 that means the hybridization will be sp and the electronic geometry of the molecule will be linear.
When there are four atoms around the central atom and no lone pair of electrons, the number of electron pairs will be 4 that means the hybridization will be [tex]sp^3[/tex] and the electronic geometry of the molecule will be tetrahedral.
When there are two atoms around the central atom and two lone pair of electrons, the number of electron pairs will be 4 that means the hybridization will be [tex]sp^3[/tex] and the electronic geometry of the molecule will be bent.
When there are five atoms around the central atom and no lone pair of electrons, the number of electron pairs will be 5 that means the hybridization will be [tex]sp^3d[/tex] and the electronic geometry of the molecule will be trigonal bipyramidal.
If I have 6.02 x 10^23 cars how many moles of cars do I have?
Answer:
1 mole of car
Explanation:
One mole of a substance is said to be equal to 6.02 × 10^23 atoms, which is Avagadro's number or constant. In other words, 1mole of every substance = 6.02 × 10^23 atoms. Hence, the number of moles in a substance can be calculated by dividing the number of atoms contained in that substance (nA) by 6.02 × 10^23.
According to this question, If I have 6.02 x 10^23 cars, this means that I have:
6.02 x 10^23 cars ÷ 6.02 x 10^23
= 6.02 ÷ 6.02 × 10^(23-23)
= 1 × 1^0
= 1mole of car
Does volume alone determine whether an object will float or sink?
Answer:
no volume does not
Explanation:
What is meant by atomic number?
A. number that represents the number of electrons in the valence shell of an atom
B. number that represents how many neutrons are in an atom’s nucleus
C. number that represents how many protons are in an atom’s nucleus
D. number that represents the total number of particles in an atom’s nucleus
Atomic number of an atom is a number that represents how many protons are in an atom’s nucleus.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Enid claims that two concentrated solutions will have a lower reaction rate
than two dilute solutions. Which statement tells whether Enid is right and
gives a correct explanation?
O A. She is right, because the dilute solutions give the molecules more
room to move around and align themselves well for collisions.
B. She is right, because the dilute solutions give the molecules more
space to move more quickly.
C. She is not right, because there will be more successful collisions
between reactants in the dilute solutions.
D. She is not right, because there will be more successful collisions
between reactants in the concentrated solutions.
D. She is not right, because there will be more successful collisions
between reactants in the concentrated solutions.
Enid claims that two concentrated solutions will have a lower reaction rate than two dilute solutions. The statement tells that whether Enid is right given as ". She is not right, because there will be more successful collisions between reactants in the concentrated solutions.
So, option D is correct one.
What is concentrated solution?A solution which has relatively large amount of dissolved solute.
Since, rate of the reaction depends upon collision between reactants molecules. Due to presence of large amount of dissolved solute in concentrated solution, more collision is takes place between solute molecules. So, rate of reaction of concentrated solution is more as compare to dilute solution.
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Can someone please check my answer??!!