Moles in 9.8g of calcium

Which of these is an appropriate instrument to measure mass? balance scale ruler graduated cylinder

The representative particle for nitrogen is: a. an atom. b. a molecule. c. a formula unit. d. none of the above

The shape of elongated hills labeled drumlins is most useful in determining the A) Age of glaciers B) Direction of glacier movement C) Thickness of glacial ice D) Rate of glacial movement

How much heat is absorbed to change 36.0 grams of water from a solid to a liquid at 0 degrees Celsius (ΔHfusion = 6.02 kJ/mol) ?

Negatively charged particles that orbit the nucleus of an atom are?

Why does a soccer ball stop rolling in a soccer game which newton law shows that?

What is the name of the compound PbS2 • 4H2O?

Why doesn't gravity pull water all the way to the center of the Earth?

What is centrifugation? Which substance is separated by this method?

All of the elements in a family or group have similar chemical properties. which of the following statements best explains why this is true? a. the elements in a group have the same number of protons in their nuclei. b.