Question

1. mass measures

a weight
b how much matter is in something.
c the atoms in an element.
d the energy in an object.

1. how many elements occur in nature?

a 118
b 100
c 94
d 84

Explanation:

• Question 4: Mass is a measure of the amount of matter in an object. Weight is the force exerted on an object due to gravity ($W = mg$, where $m$ is mass and $g$ is the acceleration due to gravity). Energy is related to work and has different forms (kinetic, potential, etc.), and the number of atoms in an element is not what mass measures.
• Question 5: As of current scientific knowledge, there are 94 naturally - occurring elements. The total number of known elements (including synthetic ones) is 118.

Answer:

1. B. how much matter is in something.
2. C. 94