What property of an element does the atomic number represent?

A. the mass of the atom

B. the size of the atom

C. the number of protons in the atom

D. the number of neutrons in an atom

Which is the formula for calculating density

A sodium atom loses one electron. Which of the following is the correct symbol for the sodium cation? Na - Na + Na+2 Na+3

Which TWO statements are true about the changing salt concentrations of ocean water? 1. When Earth's ice increases, ocean water gets more salty 2. When Earth's ice increases, ocean water gets less salty 3.

What is water made of mostly?

Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron? a) A mole of iron has more atoms. b) They both have the same mass. c) A mole of magnesium has more mass. d) They both have the same number of atoms.

What will most likely happen when a warmer air mass exists above a polar ice sheet? The temperature of the ice sheet will be lowered. Heat will be transferred from the air mass to the ice. The air mass will exert high pressure and rise upwards.

A 2.00 L sample of gas at 35 C is to be heated at constant pressure until it reaches a volume of 5.25 L. To what Kelvin temperature must this sample be heated?

Of the following reactions, which one produces oxygen gas? Fermentation Anaerobic respiration Aerobic respiration Photosynthesis

Describe the electrodes in this iron-copper galvanic cell.

What happens to wood when it burns?