One of the first properties you notice about an unknown mineral, and one of the least reliable in terms of identification, is which of the following?

a. color

b. streak

c. hardness

d. luster

By analogy to examples given in the text, predict what gas forms when na2so3 (s) reacts with hcl (aq). express your answer as a chemical formula.

How can I draw the Lewis structure for ClO2-?

What is the most important part of science

When copper is hammered into a sheet what type of change has the matter gone through?

Which is the correct equilibrium constant expression for the following reaction? Fe2O3 (s) + 3H2 (g) - -> 2Fe (s) + 3H2O (g) Kc = [Fe2O3] [H2]3/[Fe]2[H2O] Kc = [Fe]2[H2O]3/[Fe2O3] [H2]3 Kc = [H2]/[H2O] Kc = [H2O]3/[H2]3 Kc = [Fe] [H2O]/[Fe2O3] [H2]

How do you know if the reaction is exothermic or endothermic if both phase are same?

How many elements are in a set whole numbers between 3 and 15

Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.

Describe 2 theories for yawning

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. the reason for this is?