A block is found to have a volume of 35.3 cm^3. it's mass is 31.7 g. Calculate the density of the block.

Potassium nitrate has a lattice energy of - 163.8 kcal/mol and a heat of hydration of - 155.5 kcal / mol. How much potassium nitrate has to dissolve in water, at room temperature, to absorb 1.00 x 102 kJ of heat

Why do certain types of dye spread faster and how do they compare with each other?

The equation for the complete combustion CH₄ is: CH₄ + 2O₂ → CO₂ + 2H₂O If 3.70 moles of methane reacted with 5.40 moles of oxygen, what is the limiting reactant in the formation of water?

Oxygen is a diatomic gas. How many oxygen molecules are in 16 grams of oxygen? A) 0.5 molecules B) 1.20 x 1024 molecules C) 3.01 x 1023 molecules D) 6.02 x 1023 molecules

Which of the following is considered a greenhouse gas? A. argon B. oxygen C. nitrogen D. water vapor

A chemistry student needs 55.0g of dimethyl sulfoxide for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of dimethyl sulfoxide is ·1.10gcm-3.

Explain what a alloy is and how the atomic structure of the alloy can make it stronger

Liz is examing a plant cell under a Microscope she seems many small green oranganelles inside the cell

Four different methods are described for validating the results of a particular analysis. Indicate for each whether the method primarily checks the accuracy of the analysis or the precision of the analysis. a.

How does the molar entropy of a substance change with increasing temperature