Which of the following obervations would be classified as a physical change? A) Fireworks releasing light B) Antacid fizzing in water C) Steam condensing on a mirror D) Apple turning brown

Look at the chemical equation: Zn + 2HCl → ZnCl2 + H2 How many atoms of hydrogen (H) are present on both sides of the equation?

Match the following vocabulary 1. A hydrocarbon that contain no double or triple bonds alkene 2. A hydrocarbon that contain a double bond hydrocarbon 3. A hydrocarbon that contain a triple bond functional group 4.

Which of the following elements is present in all living things? a. aluminum c. carbon b. lead d. helium

In this group, which percentage does the green seed represent? 25% 50% 75% 100%

1. In order to make 1 salad it requires 1 head of lettuce, two tomatoes and three carrots. What would be the coefficients for the lettuce, tomatoes, and carrots assuming you wanted to make 3 salads? Write the coefficients below!

Sodium chloride is stirred into water to form a solution. in this case, what are sodium chloride and the water?

What can form as a result of a chemical reaction?

A solution of orange juice that weighs 500 g contains liquid juice and solid pulp. All of the pulp is removed from the juice. The pulp is found to weigh 50 g. How much would the remaining liquid juice weigh? A. 50 g B. 250 g C. 450 g D. 500 g

Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced? How many water molecules are required? What is the mole ratio of Fe to H2O?

10.0 mL of a HF solution was titrated with a 0.120 N solution of KOH; 29.6 mL of KOH were required to completely neutralize the HF. Calculate the normality of the HF solution.