Stemscopes Exam Chemistry Fundamentals

Question 1

What is the atomic number of an element?

Accepted Answer

Number of protons

Answer

The atomic number is the number of protons in the nucleus of an atom, which defines the element.

Question 2

Which subatomic particle has no charge?

Accepted Answer

Neutron

Answer

Neutrons are subatomic particles found in the nucleus that carry no electrical charge.

Question 3

What type of bond involves the sharing of electrons between atoms?

Accepted Answer

Covalent bond

Answer

Covalent bonds form when two atoms share one or more pairs of electrons.

Question 4

What is the chemical formula for water?

Accepted Answer

H2O

Answer

Water consists of two hydrogen atoms covalently bonded to one oxygen atom, giving the formula H₂O.

Question 5

In a chemical reaction, what are the starting materials called?

Accepted Answer

Reactants

Answer

Reactants are the substances that enter a chemical reaction and are transformed into products.

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