Answer the questions using the drop-down menus.

Which is the independent variable in this experiment?

Which is the dependent variable in this experiment?

Which is a controlled variable in this experiment?

Read the following chemical equation. Cl2 (g) + K + Br - → K + Cl - + Br2 (g) What most likely happens during this reaction? Potassium loses an electron. Potassium gains an electron. Bromine loses an electron. Bromine gains an electron.

According to Le Chatelier's principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress. normalizes the stress. increases the stress. changes the stress.

Ethane is a member of the hydrocarbon series with the general formula A) CnH2n+2 B) CnH2n C) CnH2n-n D) CnH2n-6

When the equation: __Fe2O3 (s) + __CO (g) → __Fe (l) + __CO2 (g) is correctly balanced using the smallest whole numbers, the coefficient of Fe (l) is

A rapid reaction is distinguished by A rapid reaction is distinguished by having a small value of activation energy. having a large value of activation energy. being unaffected by catalysts. having a large heat of reaction.

Which of the following occurs as water vapor cools in the atmosphere? condensation transpiration precipitation evaporation

What is a polyatomic ion? Consulting p. 117 in text, list the formulas and names of at least 10 polyatomic ions.

What is the ionic composition and osmolarity of "physiological saline" - the intravenous fluid drip you receive at a hospital?

Why do dipoles cancel out?

Match each chemical with the correct use. 1. x-ray soft tissue organs 2. reduce pain and fever 3. anesthetic 4. treat acne A. benzoyl peroxide B. nitrous oxide C. acetylsalicylic acid D. barium