Which physical change can involve a negative OR a positive heat

According to newtons third law of motion, when a hammer strikes and exerts a force on a nail, the nail does what

All substances have characteristic properties. If one of these properties can be observed without changing the identity of the substance, it must be a

When we think about the carbon cycle and human activities, it is important to differentiate between facts and hypotheses. Which of the following is NOT a fact, but is a hypothesis? A.

7. what is the density of an object having a mass of 8.0 g and a volume of 25 cm^3? a) 0.32g/cm^3 b) 2.0 g/cm^3 c) 3.1 g/cm^3 d) 200 g/cm^3

The density of air under ordinary conditions at 25 degrees * C is 1.19g / L. How many kilograms of air are in a room that measures 9.0ft * 11.0ft and has a 10.0 ft ceiling?

What happens to the atoms and molecules in a substance as its temperature increases?

Which pH indicates a substance that is more acidic than a substance with a pH of 4

Which is a characteristic of super-absorbent polymers? When they absorb water, they become gels. They bind to water in stoichiometric ratios. They have a single water-absorbing monomer per molecule.

A plant converts light energy from the sun to chemical energy stored in glucose through fermentation. anaerobic respiration. photosynthesis. aerobic respiration.

An analysis of 10.0 grams of sample of a compound is found to contain 27.0 percent sodium (na), 16.5 percent nitrogen (n), and 56.5 percent oxygen (o). determine the empirical formula of the compound.