What is a large oval structure that directs all of the cells activities?

AMU is based on a standard which is ___.

Nitrogen and hydrogen react to form ammonia as described by the chemical equation below: N2 + 2 H2 → 2 NH3 If you start with 2 moles of N2, how many moles of NH3 can you make? Fill in the t-chart below to answer the question.

1. What hypothesis could you propose about the relationship between the position of a type of atom in a molecule and the number of bonds that the atom forms? Explain your thinking.

An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the nucleus?

Which one of the following is an element? A. Salt water B. Sugar C. Oxygen D. Chocolate chip cookies

Which substance is the limiting reactant when 4.0 g of sulfur reacts with 6.0 g of oxygen and 8.0 g of sodium hydroxide according to the following chemical equation: 2 S (s) + 3 O2 (g) + 4 NaOH (aq) → 2 Na2SO4 (aq) + 2 H2O (l) A. O2 (g) B. S (s) C.

If EG = 19 and FG = 12 then EF = ?

Given the following reaction: 4Fe + 302 → 2Fe2O3 How many grams of Fe2O3 will be produced from 24.0 g of Fe and 5.00 g of O2? grams (round to three significant figures)

Which Group 16 element combines with hydrogen to form a compound that has the strongest hydrogen bonding between its molecules? 1. oxygen 2. selenium 3. sulfur 4. tellurium

How many hydrogen atoms are in 2.80 mol of ammonium sulfide?