A negative △H means an exothermic reaction.

True

False

One mole of an element contains which of the following? A. 6.02 atoms B. 6.02 x 1023 atoms C. 6.02 x 1023 grams D. 12 atoms

Atoms join together to form compounds by gaining losing or sharing

The molecules CH4 and CH3Cl both have tetrahedral shapes. Why is CH4 nonpolar whereas CH3Cl is polar?

Is vodka a pure substance a homogeneous mixture or a heterogeneous mixture?

Which best explains how heat plays a role in the movement of materials within Earth's interior? Hot material near Earth's surface is more dense and sinks, and when it cools, it becomes less dense and rises.

What is a compound? a) a combination of two or more substances that are not chemically combined b) a combination of two or more elements that are combined in a certain ratio

A gas has a volume of 75mL at a pressure of 200.0 kPa. What will be the new volume be in mL if the pressure is decreased to 60.0 kPa in sig figs

Give two reasons why it's important to work with a partner in a lab

Suppose you have 3.00*1018 reams of lead (pb). how many lead atoms do you have? express the number of atoms numerically.

Why is a chemical indicator added to the flask in which a titration will occur? to show when enough base has been added to determine the starting pH of the solution to neutralize the acid before adding the base to identify the starting volume of