Name a object and its material (matter)

Alyssa is trying to balance the following equation: Pb (OH) 2 + 2H2SO4 = > PbSO4 + 2H20 What number should be used to replace the question mark (?) shown in the equation above to balance it? O a. 3 O b. 1 Oco O d. 2 Oe. 4

Some coastal regions of the world have cooler summers and warmer winters than inland regions at the same latitude. What accounts for this difference in climates? A. Coastal areas receive more sunlight. B. The ocean moderates air temperatures. C.

To vaporize 2.00g of ammonia, 656 calories are required. How many kilojoules are required to vaporize the same mass of ammonia?

Compare and contrast the properties of metals, metalloids, and nonmetals. Identify groups and sections of the periodic table by group name and common properties.

What did Robert Millikan's oil drop experiment prove? A. Atoms are composed of positive charges. B. It determined the actual mass of the electron. C. Matter can be conserved. D. Atoms can be neither created nor destroyed.

Measurements show that enthalpy of a mixture of gaseous reactants decreases by 228. kJ during a certain chemical reaction, which is carried out at a constant pressure.

When 9.8 mol Fe react with 11.5 mol HCl, what is the limiting reactant and how many moles of H2 can be formed? unbalanced equation: Fe + HCl yields FeCl3 + H2 HCl is the limiting reactant, and 3.

How does the density of a hershey bar compare to the density of the a half bar?

Why is it important for scientists and o make data tables

Which of the following compounds will produce H2O as one of the products when it decomposes? a.) Hg (ClO3) 2 b.) Cu (OH) 2 c.) CaO d.) MgCO3