Chemistry test, three

Question 1

What is a chemical reaction?

Answer 1

A chemical reaction is when molecules react internally to form new substances.

Chemical reactions involve the transformation of reactants into products.

Question 2

What is combustion? Give an example of combustion.

Answer 2

Combustion is the release of energy through heat and light from a flame, such as when a candle burns.

Combustion is a specific type of chemical reaction that typically involves oxygen.

Question 3

What are reactants and products?

Answer 3

Reactants are the elements on the left side of the equation, and products are the elements on the right side.

Reactants undergo a chemical change to form products.

Question 4

What are coefficients?

Answer 4

Coefficients are the big numbers in front of a letter in a chemical equation.

Coefficients indicate the number of molecules involved in the reaction.

Question 5

What are subscripts?

Answer 5

Subscripts are the tiny numbers behind a letter in a chemical formula.

Subscripts indicate the number of atoms of an element in a molecule.

Question 6

Ionic bonding occurs when _______.

Answer 6

a metal atom donates electrons to a non-metal atom.

Ionic bonding typically results in the formation of charged ions.

Question 7

Covalent bonding occurs when _______.

Answer 7

non-metals share electrons with other non-metals.

Covalent bonds result in the formation of molecules.

Question 8

True or False: A metal atom donates electrons to a metal atom in ionic bonding.

Answer 8

False

Ionic bonding involves a metal and a non-metal, not two metals.

Question 9

What happens to non-metals in covalent bonding?

Answer 9

Non-metals share pairs of electrons.

This sharing of electrons allows non-metals to achieve stable electron configurations.

Question 10

In ionic bonding, what happens to the electrons?

Answer 10

A metal atom loses electrons and a non-metal atom gains electrons.

This transfer of electrons creates oppositely charged ions that attract each other.