Which of the following involve endothermic reactions? (select all that apply)

A. A chemical cold pack

B. Gasoline in a car engine

C. Cooking rice

D. A candle flame

Pick the compound with a higher percent ionic character than KCl.

Describe the main difference between the Bohr model of the atom and the Rutherford model

In a reaction between 6.0 g of oxygen gas, 4.0 g of hydrogen gas, and 5.0 g of solid sulfur at standard temperature and pressure to make H₂SO₄, which is the limiting reagent?

Waves move out through the ground from the source of an earthquake. True or false

1. What state of matter has definite volume and definite shape? 2. Describe the properties of liquids. 3. What is needed for states of matter to change phase? 4. Describe what is happening during sublimation / deposition.

An engineering team is conducting a trial launch of a new rocket. Which part of the engineering process is the team in?

What is a physical property of copper

Which of the following occurs when the ocean's salinity increases? a. density increases. b. density decreases. c. temperature increases. d. temperature decreases.

What name is given to the bond between water molecules?

Which of the following statements is false? The mean free path of a molecule depends on the size of the molecule.