Explain why a tire or ballon expands when air is added

Fill in the blank. A ___ is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting

Four molecules have carbon as the central atom and hydrogen atoms around it. Which shape would give rise to a polar molecule?

In medicine it is sometimes necessary to prepare solutions with a specific concentration of a given ion. A lab technician has made up 100.0 mL of a solution containing 0.50 g of NaCl and 0.30 g of KCl, as well as glucose and other sugars.

The number of electrons that can be held in the second orbit

Which of the following would you expect to see in the death of a star that is less than 0.5 solar mass A: supernova B: planetary nebula C: white dwarf D: red giant

What type of reaction takes place when atoms or molecules rearrange to form new substances?

If you pump air into cycle tyre a slight warming effect is noticed at valve stem why

Butter is melted in a pan. Which of the following is true about the change? A. It is a physical change that releases energy B. It is a chemical change that absorbs energy C. It is a physiscal change that absorbs energy D.

Describe how secondary consumer is dependent on the sun for its energy

What % of the ideal soil is air?