The amount of calcium in a 15.0-g sample was determined by converting the calcium to calcium oxalate, CaC2O4. The CaC2O4 weighed 40.3 g. What is the percent of calcium in the original sample

What does it mean for a property to be quantized?

Galvanized nails are iron nails that have been plated with zinc to prevent rusting. the relevant reaction is zn2 (aq 2e? zn (s for a large batch of nails, a manufacturer needs to plate a total zinc mass of 3.

A decrease in temperature will affect vapor pressure by: A. increasing the density of the gas molecules, thus making them heavier and more difficult to move around B.

What is true of energy as is passes through an ecosystem? a. All of the energy in an organism is used by the animal that eats it. b. Any stored energy in an organism is used by the animal that eats it. c.

how many atoms of silver would be produced if 100 grams of copper reacts with an excess of silver nitrate Cu + 2 AgNO3 - > Cu (NO3) 2 + 2 Ag

What is the relative charge carried by an electron

Which term best describes the type of bonding in magnesium chloride

This equation indicates that the reaction gives off heat. What is this type of reaction called? 2C4H10 + ? O2? 8CO2 + 10H2O + heat a. an exothermic reaction b. an endothermic reaction c. absorption reaction d. precipitation reaction

Given the balanced equation representing a reaction: C3H8 (g) + 5O2 (g) = = >3CO2 (g) + 4H2O (g) What is the total number of moles of O2 (g) required for the complete combustion of 1.5 moles of C3H8 (g) ? (1) 0.30 mol (3) 4.5 mol (2) 1.5 mol (4) 7.

What increases in equal steps of one from left to right in the Periodic Table for the elements lithium to neon?