Sodium and Chlorine combine to form table salt. Given the chemical reaction, how many grams of 2Na + Cl2 would be required to produce 4 grams of table salt?

26 g of zinc combines with 12.8 g of sulfur. What is the empirical formula of zinc sulfide? A. Zn2S2 B. ZnS2 C. ZnS D. Zn2S

When 5 grams of wood burns completely in 15 grams of oxygen, 10 grams of water and some carbon dioxide are given off. A. Identify the reactants) in this reactions. B. How many grams of carbon dioxide would be produced in this example? C.

What causes pressure inside a bicyle tire?

The dipole moment (μ) of HBr (a polar covalent molecule) is 0.838D (debye), and its percent ionic character is 12.4 %. Estimate the bond length of the H-Br bond in picometers. Note that 1 D=3.34*10-30 C⋅m and in a bond with 100% ionic character, Q=1.

Which properties change the composition of a substance? chemical and physical properties physical properties chemical properties neither chemical nor physical properties

What happens when Ag + is reacted with Na2CO3

Name two different ecosystems. Name one living part of each ecosystem. Name one non living part of each ecosystem.

Sports trainers treat sprains and soreness with ethyl bromide. it is manufactured by reacting ethylene with hydrogen bromide:

When the particles of a gas decrease in energy what happens? It freezes It changes to a liquid It changes to a plasma It gets hotter

How many days are required for 200. grams of radon-222 to decay to 50.0 grams? (1) 1.91 days (3) 7.64 days (2) 3.82 days (4) 11.5 days