Which of the following is an element?

a. zinc metal (zn)

b. carbon monoxide gas (co)

c. magnesium chloride salt (mgcl)

d. hydrochloric acid (hcl) ?

If a person can do 39J of work in 13 seconds, what is the amount of power?

What is the average atomic mass of chlorine if 75.8% of chlorine atoms are 35/17 CL with a mass of 34.9589 amu and 24.2% are 37/17 CL with a mass of 36.9659 amu?

Which of these experimental designs could lead to bias? A) Two mice are given the choice between Swiss and American cheese. B) Phil and Bart race down the street to determine who is the fastest.

If a lake became too acidic, which of the following describes the best way that scientists could determine how to make the lake more neutral? A. Dump a large quantity of a base, such as sodium hydroxide, into the lake. B.

Anthony is interested in seeing the atoms in a piece of fish scale. he breaks the scale into the smallest piece he can, and look at it under a microscope. is he able to see the atoms of the fish scale? A. No, there are no atoms in a fish scale. B.

Difference between radical and compound

Water is a produced when 30.0 grams of hydrogen reacts with 80.0 grams of oxygen what is the limiting reagent

How are reactions and products related in a chemical reaction?

Ollie wants to sign up with an online social network called TeensMeet, which other kids at school have joined.

7. A perfect cube has a width of 2 cm. What is the cube's volume? Show your work!