Muscles need a stimulus from which to of the following to "tell" them contract? A. A muscle call B. The skeleton C. A nerve cell D. None of the above

Potassium forms an oxide containing 1 oxygen atom for every 2 atoms of potassium. what is the coefficient of oxygen in the balanced equation for the reaction of potassium with oxygen to form this oxide?

which layer of the earth contains melted silicone compounds a. core b. mantle c. biosphere d. asthenosphere e. lithosphere

How do the properties of reactants compared to the properties of products of a chemical reactions?

When a spring is compressed, the energy changes from kinetic to potential which best describes this change?

The oxide of element X is reduced by heating with carbon. Element X does not react with cold water, steam or dilute hydrochloric acid. What is X?

What is one element in the same family as oxygen?

Why does a ball rolling along a level sidewalk slow down and then stop

Common properties of sodium, calcium, iron, and gold

The closeness of a measurement to its actual value is a measure of its A. usefulness. B. reproducibility. C. precision. D. accuracy.

At 300 k the pressure inside a gas filled container is 500 kPa if the pressure inside decreses to 100kpa but the volume remains the same what is the final temperature of the gas