What type of rain contains more acid than normal rain?

Answers

Answer 1

Answer: Acid Rain contains more acid than normal rain. It can cause damage to trees, and even buildings. It is caused by factory pollution.

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10. The number of protons in an atom is determined by the?a. Symbol
b. Atomic mass
c. atomic number
d. group or period

Answers

Answer:

atomic number

Explanation:

the atomic number is the same as the number of protons, you can identify it in the periodic table.

24 POINTS!!!!!!!!!!!!!!!!!!Sarah, who has a mass of 55 kg, is riding in a car at 20 m/s. She sees a cat crossing the street and slams on the brakes! Her seatbelt stops her from flying forward, bringing her to rest in 0.5 seconds. How much force did the seatbelt put on Sarah?

Answers

F = (mass)(acceleration) = ma

m = 55 kg

Vi = 20 m/s

t = 0.5 s

Vf = 0 m/s (since she was put to rest)

a=(Vf-Vi)/t

a=(0-20)/5

a = 40 m/s^2 (decelerating)

F = ma = (55 kg)(40 m/s^2)

F = 2200 N

Hope this answer will be a good help for you.

change of momentum =mv-mu=m(v-u)=55(0-20)=-1100
rate of change of momentum=-1100/0.5=-2200 this is equal to force applied.
so force=-2200 kg/m^2
negative sign shows force acts in opposite direction to motion.

Which of these is indication that a chemical reaction has occurred?A. Freezing of a substance

B. Melting of a substance

C. Boiling of a substance

D. Formation of a Preciptate

Answers

B.melting of a substance

I think it's B, the melting of a substance.

How did atomic theory develop and change?

Answers

The atomic theory develop and change as the from the Bohr's model is that how electrons occupy the space using the scientific method from the philosophy.

The John Dalton develop the Proust's work and then change the atomic philosophy of the into the scientific theory. Scientists did not believe that the electrons move in the regions not in the orbits and then they uses the mathematics and quantum numbers for the explanation.

The Bohr's model is to describe the chemical properties of an atom. The experiments demonstrated that atoms of the same element contains the different masses as the number of the neutrons can vary and called as the isotopes of the same element.

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The atomic theory started with Democritus, who stated that all space was made up of indivisible particles called atoms, though Aristotles refuted that statement by saying that matter didn’t exist, he believed in the four elements: air, fire, water, and earth. Then came Dalton, who revived Democritus’s ideas and proposed the law of multiple proportions, he revived the idea that all space was made of atoms. Soon after, J.J Thompson discovered the electron by using cathode rays. Max Planck developed the quantum theory by stating that electromagnetic radiation could only be emitted in quantized form (later called quanta). Einstein furthered this idea with studies of light. Robert Millikan eventually measured the charge of a single electron. Ernest Rutherford used a gold foil experiment and discovered the nuclei, considering his alpha particles were deflected by some object. Niels Bohr made the atomic model with electrons spinning around an atom’s nucleus, Erwin Schrodinger describes how electrons have wave like properties. James Chadwick then discovers the neutron!

There ya have it!

How many moles of copper are in 6,000,000 atoms of copper?

Answers

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 9.96×10⁻¹⁸moles of copper are in 6,000,000 atoms of copper.

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. The stoichiometry in the balanced chemical equation represents the number of moles of respective element.

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

given number of atoms of copper =6×10⁶atoms

Substituting the values

mole of copper=6×10⁶÷ 6.022×10²³

moles of copper = 9.96×10⁻¹⁸moles

Therefore, 9.96×10⁻¹⁸moles of copper are in 6,000,000 atoms of copper.

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you only have one numberso taking the number of atoms given to you 6millionis there a conversion factor that relates the number of atoms ......to 1 mole?

1. What elements are carbohydrates generally composed of?

Answers

The correct answer is hydrogen, and oxygen.

the answer is hydrogen,oxygen,and carbon

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