What parameter must remain the same for k to be a constant in the rate law equation?

Temperature

Pressure

Volume

Activation energy

How is each item classified on the pH scale? Column A 1. baking soda: pH 9.0 2. lemon juice: pH 2.3 3. ammonia: pH 11.5 4. tomatoes: pH 4.2 5. bananas: pH 5.0 6. pure water: pH 7.0/Column B A. acid B. base C. neutral

Calculate the net charge on a substance consisting of a combination of 7.3 * 1013 protons and 9.0*1013 electrons. The elemental charge is 1.6 * 10-19 C

Which statements are true of heterogeneous mixtures? 1) They settle out 2) The proportions of solute to solvent may vary. 3) The solute is evenly distributed throughout 4) They are composed of two solvents and to soutes 1 and 2 2 and 4 3 only 2 only

Which cohesive forces are the strongest in water? A.) London dispersion forces B.) dipole interactions C.) hydrogen bonding interactions. D.) All intermolecular forces in water are equally strong.

How many moles of sodium chloride are present in 0.50 kg of a 1.0 m solution of sodium chloride in water? mol sodium chloride

When you open a bottle of a soft drink and leave it open, the drink eventually goes flat. this happens because the equilibrium between carbonic acid and carbon dioxide shifts to produce?

When you go down a group, does the tendency for a metal to react (become duller) increase or decrease?

The force of gravity on Planet B is 3.4 m/sec2. A box weighs 34 N on Earth. What is the mass of the box? a) 3.47 kg b) 333.2 kg c) 115.6 kg d) 10 kg

Assume that 4 molecules of nitrogen and 9 molecules of hydrogen are present? after complete reaction, how many molecules of ammonia are proceded?

Which of the following are chemical changes? Check all that apply. A. sugar is dissolved in water B. A warm coke bottle fizzes when opened C. The Copper roof turns green over time D. Baking soda is dissolved in vinegar and bubbles appear E.