What is measured in mercury

A compound has 8 moles of hydrogen and 4 moles of carbon. The empirical formula of the compound is:

Which pair of nitrogen bases will form a bond in a DNA molecule? a. cytosine and adenine b. adenine and thymine c. guanine and thymine d. thymine and cytosine

What does the brain stem control? breathing heartbeat consciousness all of the above

Seed-bearing plants are ales referred to as?

If one person can clean a house in 5 hours and the second person can clean the same house in 4 hours, how long would will it take to clean the house if they worked together?

The same amount of heat is removed from 2kg of water and from 1kg of water starting at the same temperature. What happen?

When heated a sample consisting of only CaCO3 and MgCO3 yields a mixture of CaO and Mgo. If the weight of the combined oxides is equal to 51.00% of the initial sample weight, calculate the per cent of CaCO3 and MgCO3 in the sample. (12 M.)

Why does pumice float

At STP, 4 liters of O2 contains the same total number of molecules as (1) 1 L of NH3 (3) 8 L of He (2) 2 L of Cl2 (4) 4 L of CO2

When the pressure that a gas exerts on a sealed container changed from 32.6 psi to ___ psi, the temperature changes from 735 k to 1035 k?