True or false. A change of color is a sign that a chemical reaction is taking place.

What is true when two reactants combine in an exothermic reaction?

Which has should only be produced in a fume hood? a. Cl2 b. CO2 c. H2 d. H2O

The volume of a gas is 36.0 ml at 10.0°c and 4.50 atm. at what temperature (°c) will the gas have a pressure of 3.50 atm and a volume of 85.0 ml?

How many molecules are there in 162 grams of NO2

Which of the answer choices correctly describes a solvent made of molecules that have areas of partial positive and negative charge? ionizing solvent polar solvent true solvent nonpolar solvent

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?

How can equilibrium of a closed system chemical reaction be disturbed? Select all that apply. Adding or removing products or reactants. Keeping the concentration of products and reactants the same. Keeping the temperature of the system constant.

Why does an exothermic reaction need activation energy?

The temperature of 15 grams of water increases by 3.0 degress. how much heat was absorbed by water?

What are the four types of stoichiometry problems?