Which of the following elements is present in all living things?

a. aluminum

c. carbon

b. lead

d. helium

When 8 moles of lithium metal react with excess oxygen gas, how many moles of lithium oxide can be produced? 2Li + O2 → Li2O 2 4 8 16

In the chemical formula 3NH4, how many total atoms of hydrogen (H) are there?

What occurs during the death of a large star to make all heavy elements?

Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?

2. How does the way elements are grouped in the periodic table serve as an advantage to scientists?

Sodium chloride is stirred into water to form a solution. in this case, what are sodium chloride and the water?

What can form as a result of a chemical reaction?

A solution of orange juice that weighs 500 g contains liquid juice and solid pulp. All of the pulp is removed from the juice. The pulp is found to weigh 50 g. How much would the remaining liquid juice weigh? A. 50 g B. 250 g C. 450 g D. 500 g

Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced? How many water molecules are required? What is the mole ratio of Fe to H2O?

10.0 mL of a HF solution was titrated with a 0.120 N solution of KOH; 29.6 mL of KOH were required to completely neutralize the HF. Calculate the normality of the HF solution.