To create an isotopeof a certain element, you must vary a number of:

A. atoms

B. neutrons

C. protons

D. electrons

What are three physical factors that can be done to speed up a chemical reaction

Which of the following elements has two (2) valence electrons? A. Na B. Mg C. Al D. S

Which statement justifies that hydrogen peroxide (H2O2) is a polar molecule? The O - H bond is nonpolar and the molecule is asymmetric. The O - H bond is nonpolar and the molecule is symmetric. The O - H bond is polar and the molecule is asymmetric.

Using the rules for scientific figures, what do you get when you multiply 67.6 by 1.2 a) 8 b) 81 c) 81.1 d) 81.12

When solutions of sodium carbonate and calcium chloride are combined, calcium carbonate precipitate is produced, along with aqueous sodium chloride. Write a balanced equation for the reaction, including states of matter.

The smallest unit of an element is a blank

How many sodium atoms will create an ionic bond with sulfur?

Rank the elements from smallest to largest electronegativity negativity (smallest at top) 1. N 2. P 3. As 4. Sb

A bicyclist pedaling up a Hill. What type of energy potential or kinetic?

What improvements have been made in modern farming? Select all that apply. 1. machines can do more work over less time 2. better seeds sprout and grow much more quickly 3. trains can transport food over long distances faster 4.