Which of the following is a single-replacement reaction?

A. CaCl2 + Na2CO3 CaCO3 + 2NaCl

B. H2 + Cl2 2HCl

C. 2AgNO3 + Cu 2Ag + Cu (NO3) 2

D. CH4 + 2O2 CO2 + 2H2O

Which is a substance that could be found in air, water, or soil that is harmful to humans or animals?

In the electron cloud model of the atom, an orbital is defined as the most probable of what?

J5 protons and 74 electrons 9. As the number of neutrons in the nucleus of an atom increases, the nuclear charge of the atom A. decreases B. increases C. remains the same page 2 Chemistry CFA Unit 1

The reaction of 1.250 g k with o2 forms 2.273 g of an oxide of potassium that is used in self-contained breathing devices. determine the formula for this oxide of potassium.

The pOH of a solution is 9.21. Calculate the hydrogen ion concentration of the solution. Be sure to report your answer to the correct number of significant figures

Acetylene is hydrogenated to form ethane. the feed to the reactor contains 1.4 mol h2/mol c2h2. (find properties of the reactants/products in appendix of book) a.

Several properties of the element magnesium are shown. Which one is a chemical property?

How does the quantity of atp produced as a result of activity by the electron transport chain compare to the quantity produced as a result of glycolysis?

Molybdenum has a molar mass of 95.94g/mol. How many molecules of molybdenum are in 150.0 g of molybdenum

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.