What is a compound?

a poly element pure substance

a homogenous mixture

a single element pure substance

a heterogeneous mixture

What term describes the management of soil to prevent its destruction? A. Soil exhaustion B. Soil decomposition C. Soil conservation D. Soil fertility

a 1.28kg sample of water at 10.0C is in a calorimeter. You drop a piece of steel with a mass of 0.385kg at 215C into it.

Latent heat of vaporization refers to which changes of state? liquid to gas or gas to liquid solid to gas or gas to solid solid to liquid or gas to liquid gas to liquid or liquid to solid

The concentration of an isotope is 1/500 of its initial value after one day. What is the rate of decay?

A lever where the resistance force is between the fulcrum and the effort force is a second-class lever. true false

When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is: