Why shouldn't you look at burning magnesium ribbon?

Which observations would support the claim that as plants absorb sunlight to make food, they release oxygen into the environment? A. Oxygen concentration in the atmosphere was much higher millions of years ago when different plants existed B.

It is impossible for me to be created, and I can never ever be destroyed, I can only change form. What am I?

When a nonmetal bonds with a nonmetal it is a _ bond

Which of the following values of x is in the solution set of 2x + 4 > 14?

A certain substance has a mass per mole of 47 g/mol. When 312 J is added as heat to a 34.0 g sample, the sample's temperature rises from 24.0°C to 44.0°C.

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?

Individuals who work full time and those who work part-time enjoy basically the same number of paid leave benefits. True False

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.