7. The model of the universe that suggests that the sun is the center of the universe was first brought by

A. Brahe.

B. Ptolemy.

C. Copernicus.

D. Kepler.

How many moles of HCl can be neutralized by 0.1 liter of 0.5 M NaOH? A. 0.1 B. 0.05 C. 0.5 D. 0.4

State a reason why most chemicals are stored in glass or plastic containers rather than metallic ones

Contrast molecules, compounds and ions

Lists how many valence electrons are shared, gained, or lost by each atom of the 6 compounds? N2 CCl4 SiO2 AlCl3 CaCl2 LiBr

What does dehydration of alcohol produce?

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

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?