What is the reactant (s) of the reaction below?

MgCO3 (s) → MgO (s) + CO2 (g)

O

A. Magnesium oxide and carbonate

O

B. Magnesium carbonate

O

O

C. Magnesium and carbon dioxide

D. Magnesium oxide

The of breakdown of a radioactive isotope into a stable isotope called

Why does ice get colder when you melt it?

A scientist wants to make advances in the way skin cancer patients are treated. What is something she should do first? O A. Study the side effects of her new treatment. O B. Look at the success rate of the current treatments. O C.

Imagine a cell with a semi-permeable membrane that is selective to K + ions only. The internal solution contains 100 mM KCl and the external solution contains 1 mM KCl.

A chemistry student mixes 25 milliliters of 3.0 M hydrochloric acid (HCl) with excess sodium hydroxide. The chemicals react according to this chemical equation: HCl + NaOH → NaCl + H2O.

Which of the following statments is true for gas particles? they move freely and combine with each other. they dont move at all they move slowly and in a structured pattern they are constantly in motion and changing position.

What is the effect of a catalyst on a reaction? It increases the entropy. It decreases the entropy. It changes the equilibrium. It makes the products more stable.

Where should you place the title when constructing a graph?

Which of the following applies to He gas in the tank when additional oxygen is added at constant temperature? A rigid metal tank contains oxygen gas. A. The volume of the gas increases B. The pressure of the gas decreases C.

Which statement does NOT coincide with kinetic-molecular theory? A.) Gas particles assumed to have an insignificant volume B.) Gases are made up of hard spherical particles C.) All gases particles move in a constant random motion D.