A train traveled at an average speed of 80 mph for

4.2 hours. Then, it traveled at an average speed of

60 mph for 1.5 hours. What was the total distance

covered by the train?

miles

Explain the properties of the substance around us depend on the atoms and molecules that compose them

How many moles of argon are equal to 3.01*1023 atoms

Which is an example of a chemical change? a. water evaporating from a puddle b. cloth tearing when pulled c. wood forming sawdust when cut d. bread baking in an oven

Which substance has a molar mass of 133.3 g? BaCl2 P2O5 AlCl3 MgCl2

When sugar is added to a sugar solution, the sugar does not dissolve, which term describes the original sugar solution? A. unsaturated B. supersaturated C. Saturated D. semisaturated

What is accuracy? The same as precision It refers to how closely individual measurements agree with each other. It referes to how closely a measured value agrees with the correct value. It increases with the number of measurements.

If we know that 10.0 cm3 of ice has a mass of 9.19 g what is the density of ice

If the pressure of 125 l of gas is changed from 2.52 atm to 1.50 atm the new volume will be

A hot air balloon is filled with 15 moles helium gas and 5 moles nitrogen gas. What is the volume of the balloon at 1.01 atm and 300 K?

5. Which of these changes is a chemical change? A. iron rusting B. water boiling C. glass breaking D. a balloon popping