Give the number of significant figures in this number: 2.115

a. 4

b. 0

How many moles of MgCl2 are there in 343 g of the compound?

Do you think that crocodiles share a common ancestor with birds, dolphins and dogs

A buffer contains significant amounts of ammonia and ammonium chloride. part a write an equation showing how this buffer neutralizes added acid (hi).

For which of the following is heat energy released? Evaporation Melting Condensing Boiling I know its either A or D

The formation of an ionic compound between magnesium and bromine would have which chemical formula

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?

Which of the following is a type of electromagnetic radiation? a. Electrons b. Neutrons C. Electromagnetic waves d. Helium nuclei