An unknown or changeable quantity is called a (n) ...

Why is argon and chlorine both gases at room temperature?

The half-life of carbon-14 is about 6000 years. assume that a sample of charcoal is formed by burning of living wood 15,000 years ago. how much of the original carbon-14 would remain today?

Acid-catalyzed dehydration of an alcohol is an equilibrium situation. How was the reaction forced to completion in Acid-Catalyzed Dehydration of 2-Methyl-2-butanol?

How does the precision of the absolute-age dating compare to the precision of relative-age dating?

Study the following two reactions. Select all that apply. C (graphite) + O2 (g) → CO2 (g) + 94.05 kcal C (diamond) + O2 (g) → CO2 (g) + 94.

Nitrogen molecules rest with oxygen molecules. Nitrogen monoxide molecules are made. N2 + O2 → 2NO Nitrogen molecules and oxygen molecules react extremely slowly, even at 200°C.

What is the name of an object containing both elements #29 and 30 with element #30 in the center surrounded by element #29?

Check every statement about the use of energy by living things that is true. Plants perform chemical reactions that require energy. Animals can use energy from the sun to produce their own food. Plants receive their energy from water in the soil.

Type of bond between na+1 ion and Cl-1 ion is ion

Does a liquid release energy or absorb energy when it changes into a gas? into a solid?