Molecules are composed of atoms.

True

False

Why are experimental investigations the best type of scientific investigation to demonstrate cause-and-effect relationships?

The student who performed this experiment in the question above wrote the following discussion: "The gas sample is known to contain compounds of only hydrogen and carbon. The measured molecular weight of the flammable gas is closest propane (44.

Cathode is zinc or copper

Visible light is the A. highest energy level on the electromagnetic spectrum. B. only part of the electromagnetic spectrum that can be seen by humans. C. lowest energy on the electromagnetic spectrum.

Potassium has a mass number of 40 and an atomic number of 19. how many protons does it have?

A plant grows three inches in a month. Why is this a physical change?

In natural convection heat transfer, the parameter is the Choose the right answer a) Nusselt number b) Rayleigh number c) Grashof number d) Lewis number

An insulator: A. Conducts heat well B. Does not conduct heat well C. Is used to heat cold objects D. Is used to cool hot objects

Which of the following choices would have a negative entropy change? A. N2 (g) + 3H2 (g) - >2NH3 (g) B. CaCO3 (s) - > CaO (s) + CO2 (g) C. H2O (s) - > H2O (l) D. Fe2O3 (s) + 3C (s) - > 2Fe (s) + 300 (g)

Increasing the temperature of a liquid-solid solution will: