A change in the properties of matter that does not change the makeup of the substance is

a chemical change

a physical change

a nuclear change

a covalent change

The law of reflection states that if the angle of incidence is 43 degrees, the angle of reflection is ___ degrees.

Garfield (weighing 24 lbs) took a flight to the moon on the space shuttle. As usual, he stuffed himself with lasagna during the entire flight and napped when he wasn't eating.

On Earth, the white colored paper represents areas that are A) covered with snow and reflect sunlight. B) heavily populated and use the sunlight. Eliminate C) covered with water and reflect sunlight. D) covered with concrete and absorb sunlight.

Explain why animals must eat food, but plants do not have to.

What is one of the primary unanswered questions about the origin of the universe? What type of elements formed first? Approximately how long ago did the big bang occur? How long did it take the earth to form? What came before the big bang?

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.

Under what condition is decompostion the fastest? Under what condition is it the slowest?

Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI