Q:1-Chlorine-35 and chlorine-36 are isotopes. What do they have in common?
Mark one answer:

Number of nuclear particles
Number of protons
Number of neutrons
Mass number



Q:2-Which of the following is true for a solid?
Mark one answer:

It fills the volume of the container holding it
It is characterized by close bonds between all molecules
It has an indefinite shape and volume
It occurs when a substance has been heated and pressurized past its critical point


Q:3-How many protons are in an atom of oxygen?
Mark one answer:

4
6
8
16


Q:4-Which of the following is not true about catalysts?
Mark one answer:

They increase reaction rate
They increase activation energy
They assist in stabilization of reaction intermediates
Biological catalysts are known as enzymes


Q:5-Which of the following is not true for ionic bonds?
Mark one answer:

One atom loses electrons to another atom
The net formal charge on the resulting compound is zero
Electrons are shared between two atoms
Cations bond to anions


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