14C has a half-life of 5600 years. An analysis of charcoal from a wood fire shows that

its 14C content is 25% of that in living wood.

How many years have passed since the wood for the fire was cut?

A large marble is dropped in a graduated cylinder with 35ml of water in it. The water level increases to 49ml. What is the volume of the marble

In the word equation, sodium oxide water sodium hydroxide, the formula for sodium hydroxide is represented by

A hydrogen bond can occur between: A. The two hydrogen atoms on a water molecule. B. Two oxygen atom surrounded by hydrogens. C. A hydrogen from one molecule and an oxygen from another molecule. D. Two hydrogen atoms on different molecules.

A sample of a compound contains 65.4 grams of zinc, 12.0 grams of carbon, and 48.0 grams of oxygen. What is the mole ratio of zinc to carbon to oxygen in this compound? (1) 1:1:2 (3) 1:4:6 (2) 1:1:3 (4) 5:1:4

When astronomers observe distant galaxies, they can tell the most of them are moving away from one another. In addition, the more distant the galaxies, the more rapidly they are likely to be moving away from each other.

The density of gold is 19.3 g/cm3. What is the volume of a 575 gram bar of pure gold?

How man kilo-calories of heat are required to raise the temperature of 225 g of aluminum from 20 C to 100 C? 0.59 kcal 3.8 kcal 38 kcal 85 kcal

In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCl in an excess of Mg

An element has an atomic number of 92 and a mass number of 234, how many neutrons are there?

What energy is a quarterback's arm before throwing a pass