A sample of calcium has a volume of 10.0 ml. the density of calcium is 1.55 g/ml. which is the correct expression to calculate the mass of the sample using dimensional analysis?

Which statement describes the periodic law? Metals are both good conductors of heat and electricity. Atomic masses always increase across a period. Nonmetals are of the most reactive elements.

What two substances are indicated by the cobalt chloride and limewater tests?

Give the number of significant figures in this number: 2.110

To find the mass defect for uranium-238 several calculations must be made. which is the calculation that should be made first? assume atomic number for uranium-238 is 92. 92 (1.0073) x 92 (1.0087) = 92 (1.0073) x 146 (1.0087) = 146 (1.0073) x 238 (1.

What can you conclude about these two reactions based on the chemical equations? Reaction A: 6CO2 (g) + 6H2O (l) + sunlight → C6H12O6 (aq) + 6O2 (g) Reaction B: 2H2 (g) + O2 (g) → 2H2O (g) + energy

Which of the following is not a projectile? a. a satellite b. a throw ball c. a ball on the ground d. a soaring arrow

A change of state requires the addition or removal of heat energy. True False

Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars.

How long does a hydrogen bond last in water

If the body temperature of a person is recorded as 37°c, what is the person's body temperature in k? round your answer to the nearest whole number.