Question

Which of the following chemical reactions is an oxidation-reduction reaction?
Answer
WO3 + 3H2 W + 3H2O
KNO3 + LiCl LiNO3 + KCl
CaSO4 + 2NaCl Na2SO4 + CaCl2
Mg(NO3)2 + 2HBr MgBr2 + 2HNO3
According to the collision theory and model created to explain the collision theory, what is the best explanation for why a higher concentration makes a reaction go faster?
There are more collisions per minute.
It increases the distance between the particles.
It increases the average kinetic energy of the particles.
It increases the average kinetic energy and there are more collision pe

Answer 1

per minute* it goes to the last answer choice

Answer 2

1. WO3 + 3H2 W + 3H2O
2. There are more collisions per minute.

Answer 3

Fuel cell cars that use hydrogen as fuel have the potential to be quiet, produce low emissions, and require less maintenance than gasoline cars. What negative effect might hydrogen fuel have on the environment?
Answer
Society will drive more because the fuel is cheaper and more abundant.
To produce the hydrogen, a fuel must be burned and emissions will be produced.
More cars will be on the road because they will be cheaper and less costly to drive.
Hydrogen is dangerous and many vehicles will explode before technology becomes safe

Answer 4

To produce the hydrogen, a fuel must be burned and emissions will be produced.

Answer 5

Which of the following best describes the forces that generate solar power?
Answer
Energy of the sun strikes photovoltaic cells producing a flow of electrons.
Heat energy beneath the Earth's surface heats underground water into steam.
Heat energy is released during nuclear fission and steam is produced to turn a turbine.
Heat from the Earth’s core and pressure transform the remains of dead plants and animals.

Answer 6

c'mon SOLAR power!!!

Answer 7

wrong one!! I ment this one lol, sorry!!

Answer 8

Which of the following best describes a chain reaction in a nuclear fission reaction?
Answer
The chain reaction continues until the source of power that initiated the reaction is used up or is switched off.
The chain reaction continues until control rods are used to stabilize the uranium-238 which controls the potential for explosions.
The chain reaction continues until the rate of collision between uranium-235 and uranium-238 isotopes falls below useable levels.
The chain reaction continues until all uranium-235 isotopes have split, or until the neutrons fail to collide with any more uranium-235 nuclei.

Answer 9

so what do you think which answer is correct?

Answer 10

for which question

Answer 11

The chain reaction continues until the rate of collision between uranium-235 and uranium-238 isotopes falls below useable levels.