If the half-life of a radioactive substance is 2 seconds, how much of a 100-gram sample would be left after 8 seconds?

How would the galaxy be different if gravity did not exist

How would you expect energy to change during a chemical reaction? A. Energy will be increased. B. Energy will be decreased. C. Energy will be converted into another form. D. Energy will be consumed.

A scientist conducts a chemical reaction. At the beginning of the reaction, she combines 5.4 grams of the first reactant and 6.3 grams of the second reactant. She runs the reaction in a closed chamber and heats only the reaction.

Dichotomous Keys are used to identify organisms based on their observed characteristics. Dichotomous means ... A. A list of organism names B. A confusing list of questions C. To classify D. Divided into two parts

When two substances go through a chemical change what happens A, They always turn into gases B, Their physical properties remain the same C, their molecules remain the same D, They form a new substance with different properties

What does the dashes line represent? A. Medium B. Boundary C. Normal D. Incident Ray

Only a small amount of cerium oxide nanoparticles is needed because the nanoparticles ... 1) are elements 2) are very reactive 3) have a high surface area to volume ration

Describe the solubility of water compared to ethanol?

When the free-energy change (AG) of a reaction is negative, the reaction is said to be: Endergonic Non spontaneous Spontaneous Endothermic

The solubility of carbon dioxide gas in water can be increased by