How old is a fossil that has radioactivity decayed through 4 half-lives of carbon - 14?

Sodium metal and water react to form hydrogen and sodium hydroxide. If 5.98 g of sodium react with water to form 0.26 g of hydrogen and 10.40 g of sodium hydroxide, what mass of water was consumed in the reaction

What mass of oxygen reacts with 3.6 g of magnesium to form magnesium oxide?

Cold, dense water with high salinily sinks as it moves toward the equator. As it is heated it because less dense and rises moving water back toward the north pole. This describs which type of ocean current

What is the shape of the waterline?

Stainless steel is an alloy of iron, chromium, nickel, and manganese metals. If a 2.000 g sample contains 10.0% nickel, what is the mass of nickel in the sample?

Science does not include beliefs or opinions theories laws conclusions

For which of the following reactions is ΔHrxn equal to ΔHf of the product? You do not need to look up any values to answer this question. Select all that apply.

You have three molecules of glucose (3C^6H^12O^6). How many carbon atoms do you have?

If the arrangement of atoms in a substance changes

A certain element x has four isotopes. 5.845% of x has a mass of 53.93961 amu. 91.75% of x has a mass of 55.93494 amu. 2.123% of x has a mass of 56.93539 amu. 0.2820% of x has a mass of 57.93328 amu. what is the average atomic mass of element x?