Which statement is true about Hf and HF?

(1) both are elements

(2) both are compounds

(3) both are substances

(4) Hf is a compound while HF is an element

What is the maximum number of electrons that an sub-level can have?

This is a type of element or substance that is not a metal.

According to newtons first law of motion an object at rest tends to stay at rest unless what?

The periodic table tells you how many grams are in a mole of atoms of any element. This is known as the: a. gramole b. molar mass c. atomic mass unit d. empirical formula

The density of a substance is 4.8g/mL. What is the volume of a sample that is 19.2g?

Which material best absorbs sound waves in a room? a. heavy curtains b. hardwood floors c. brick walls d. cement floors

Does density of water depend on the amount of water present?

Which of the following air fronts does not move? a Occluded front b Cold front c Stationary front d Warm front

Kwame wants to measure the volume of water contained in a disposable foam coffe. Which should he use? Nanoliters? Milliliters? Or liters?

Which of the following changes the solid Earth the most?