Which of the following is a compound machine?

A. Bicycle

B. Ramp

C. Knife

D. Screw

When a spring is compressed, the energy chaneges from kinetic to potential. Which best describe what is causing this change?

A solution is made by mixing 114. g of benzene C6H6 and 83. g of acetyl bromide CH3COBr. Calculate the mole fraction of benzene in this solution. Round your answer to 3 significant digits.

In scientific notation the radius of the sun is ... times 10 ... kilometers

Sodium is a silvery-white metal that reacts with chlorine gas, which is a yellow-greenish gas that is toxic. The reaction gives off a lot of heat.

What is the volume of 23.4 grams of nitrogen gas at 750 mmHg and 28 degrees C

The type of social bonds present in modern societies that are based on difference, interdependence, and individual rights is called:

The difference between ionic covalent and metallic bonding

As the speed of a particle increases, does its associated wavelenght increase or decrease

The composition of air by volume is approximately 1/5 oxygen, 4/5 nitrogen. When air is passed through red-hot carbon, the following reaction occurs: 2C + O2 (g) 2CO (g).

How many atomic mass units are equal to 1.672*10-24 g of protons?