Which of these is a mixture?

calcium

carbon dioxide

salt water

potassium

What is the part of the cell that stores food?

Which type of force can act through empty space? spring tension normal magnetism

Which two statements are true about energy transformations? Energy is never released from an object as heat. Energy is never transformed between kinetic energy and potential energy. Energy is never created. Energy is never completely transformed.

A security guard walks at a steady pace, traveling 190 m in one trip around the perimeter of a building. It takes him 250 s to make this trip

True or false: Black holes are invisible because they do not reflect light? A. true B. false

The molecules of a substance are moving rapidly in a container. The molecules do not interact with each other. If the container is opened, the molecules will escape from the container. In what phase of matter are the molecules in the container?

Which prefix represents tenths in the metric system?

How does melting And burning sugar follow the law of conservation of mass

A hill has three paths up and sides to a flat summit area that three path Lanks are different but the vertical height from the bottom of the mountain to the top is the same A) which path would be easiest for a car to claim B) not including the

Which one of the following is not an organic compound? Why? CH4 C2H6O Ca0