What is the length of decay of carbon-14?

a. A couple days

c. A couple seconds

b. A couple hours

d. A few thousand years

A compound is 52.14% C, 13.13% H, and 34.73% O by mass. What is the empirical formula of the compound?

What is the volume of a paperback book 21 cm tall, 12cm wide, and 3,5 cm thick?

Starting a fitness plan slowly will lead to better results than starting out quickly.

Why all compounds are molecules but not all molecules are compounds.

Why is useful to use moles to measure chemical quantities

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?

How can equilibrium of a closed system chemical reaction be disturbed? Select all that apply. Adding or removing products or reactants. Keeping the concentration of products and reactants the same. Keeping the temperature of the system constant.

Why does an exothermic reaction need activation energy?