Why do all humans have similar features? A. They have the same number and kinds of chromosomes. B. They have identical alleles. C. They have different alleles. D. Their genes do not allow for any variation.

How much heat is lost when 640g piece of copper cools from 375C, to 26C (the specific heat of copper is 0.09cal/gxC)

Which sample has more atoms in it? 150.0 g of gold or 10.0 g of lithium.

What are the three properties of gems?

How many valence electrons does a neutral atom of chlorine have?

When writing numbers using scientific notation, numbers greater than one have ... exponents and numbers less than one have ... exponents

Name the compound K3 (PO4) 3

How many grams of silver chloride (AgCl) can be produced if you start with 12.5 grams of barium chloride (BaCl2) ? 2AgNO3 + BaCl2 = = > 2AgCl + Ba (NO3) 2

Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese (IV) oxide. 4 HCl (aq) + MnO 2 (s) ⟶ MnCl 2 (aq) + 2 H 2 O (l) + Cl 2 (g) 4HCl (aq) + MnO2 (s) ⟶MnCl2 (aq) + 2H2O (l) + Cl2 (g) A sample of 43.

Calculate how many moles of glycine are in a 160.0-g sample of glycine. express your answer using four significant figures.

Which of the following words correctly describes CO2? Select all that apply A. Its a substance b its a compound c its a element D its a mixture