Classify each substance as either a mixture or a pure substance.

Chlorine

water

air

brass

coffee

olive oil

copper

How many atoms are represented by the formula (nh4) 2co3?

Phenomenon meaning in English

Why is Jupiter so much larger than Earth? Check all that apply. Inner planets were created at higher velocities. Outer planets have less gravity than inner ones. Outer planets attracted helium, hydrogen, and other gasses.

Which is an example of a solution? a. flour and water b. sand and water c. salt and water d. oil and water e. ice and water

Which nuclear emission has no charge and no mass? (1) alpha particle (3) gamma ray (2) beta particle (4) positron

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?