Which of the following is true for combustion reactions?

Energy is absorbed.

Energy is released.

Hydrogen is a reactant.

Nitrogen is a reactant.

Name three characteristics of nonmetals.

Plant cells undergo a process called photosynthesis, which uses sunlight to make sugar. Which need does photosynthesis fulfill for plants?

In a mixture of 1.75 moles of gas, 0.75 moles are nitrogen molecules. What is the mole fraction of nitrogen in this mixture?

How many moles of chlorine gas and 120°C and 33.3 ATM would occupy a vessel of 12 L?

According to the periodic table, the neutral atom of what element has 4 protons, 5 neutrons, and 4 electrons

True of false an unbalanced force cannot change the direction in which an object is moving

What are the primary atoms that make up the scents that we smell?

What happens if sodium sulfide is added to iron (II) sulfide?

What is the lowest energy level that contains d orbitals? O A. 4 O B. 1 O c. 3 O D. 2

What is the nature of the Ca-Cl bond in a molecule of calcium chloride (CaCl2) if the electronegativity value of calcium is 1.0 and that of chlorine is 3.167 O A nonpolar covalent B. moderately polar covalent C.