An unknown material has a mass of 5 g and a volume of

7.25 cm3. What is the density of the material? Round to the nearest tenth.

Classify each description by the phase change it depicts. melting freezing evaporation condensation

Which of the following describes an exothermic reaction? O A. AHI, reactants = 0 O B. AHf, reactants = AHf, products O C. A He, reactants > AHf, products O D. A He, reactants < AH, products

2. A gas has a volume of 350 ml at 45. C. If the volume changes to 400.0 ml, what is the new temperature? (answer in °C)

The gaia hypothesis is an example of

Two atoms that have the same atomic number but different mass numbers are called

What is the mass of 1 mole of carbon dioxide CO2?

An experiment is performed using 7 liquids; Methanol, Ethanol, Propanol, Butanol, Water, Pentane and Acetone. a.) The order of rates of evaporation from fastest to slowest are shown: Pentane, Ethanol, Methanol, Acetone, Water, Propanol and Butanol.

What does a molecule look like

If a student calculated 0.02789 moles of copper (II) cations (Cu2 + ions) in the sample, how many moles of copper metal (Cu0) could be obtain from the sample at the end of the experiment?

99pts! Which of the following best explains what happens when the kinetic energy of particles in a gas state decreases? They vibrate so quickly that the particles ionize and become plasma.