Below is a list of substances. Some are mixtures and some are not. Select all of the substances which are homogeneous.

a. Soil

b. The atmosphere

c. A carbonated soft drink (without bubbles)

d. Gasoline

e. Gold f. A solution of ethanol and water

Which is a difference between strong and weak acids?

Which of the following are correct statements? Check all that apply. A. An atom is the basic unit matter. B. The atomic number is the number of neutrons an atom has. C. The number of electrons an atom has defines what kind of element it is D.

Calculate work done when a 40 N force produces a displacement of 20 m in the direction of force

What is polarity as used in magnets?

A rock at the top of a 30 meter cliff has a mass of 25 kg. Calculate the rock's gravitational potential energy when dropped off the cliff. Assuming that energy is conserved and there is no air friction and gravity is 9.8 m/sec.

Boron has an average mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent. The other isotope has a relative abundance of 80.20 percent. What is the mass of the two isotopes?

What type of radiation is most likely to damage DNA? A. ionizing B. non-ionizing

Water vapor cools and comes together to form a cloud. This is an example of what change in state? condensation evaporation melting

Which group of the periodic table does this element most likely belong to

What is the ph of a 7.5*10^-3 m H + solution