Which term is defined as the sum of protons and neutrons in an atomic number?

a) charge number

b) mass number

c) atomic number

d) balance number

These two beakers represent solutions of HCl and NaOH

A covalent compound is formed when a chemical reaction occurs between atoms of

What elements are lipids comprised of?

Which soil layer contain the most humnas

Why is water considered a polar molecule?

Hydrochloric acid is purchased in 12 molar concentrations. If I needed 200 ml of 2.0 molar HCl, how many milliliters of the concentrated solution would I need

Which of the following represents a chemical change? Bending a wire Freezing of water Fireworks exploding Melting of a wax candle

5.00 L of a gas is collected at 100K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure? A. 400 °C B. 127 °C C. 223 °C D. 627°C

Before the initial explosion was the matter hot or cold

Which of the following atoms has seven valence electrons? chlorine (Cl) nitrogen (N) manganese (Mn) oxygen (O)