Which of the following best describes a mole as used in chemistry?

A a simplification of mathmatics

B a salt dissolved in water

C a very large number of objects

D a measure of concentration

A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher's head? a. chemical b. mechanical c. kinetic d. thermal

Sulfur is in the same column of the periodic table as oxygen. T/F

What is the definition for a secondary vent

Use the reaction: 2AgNO3 (aq) + H2SO4 (aq) → Ag2SO4 (s) + 2H2O (l) What volume of 0.123 M AgNO3 (aq) is needed to form 0.657 g of Ag2SO4 (s) ? (A) 53.4 mL (B) 10.7 mL (C) 17.1 mL (D) 34.2 L (E) 34.2 mL

Which best compares habitat and niche? A) Niche is a place in which organisms live, and habitat is the way in which an organism fits into its habitat.

Zinc phosphide, Zn3P2, is often used as a rat poison. Phosphorus has 5 valence electrons. How many valence electrons does each zinc atom lose?

Nonrenewable resources are?

Watch the animation, then check off the samples that will conduct electricity. Check all that apply. View Available Hint (s) Check all that apply. NaCl solution Solid NaCl Solid sugar Sugar solution

Burning wood represents a chemical change. True or False?

Why are phosphates in laundry detergent