What is the second most abundant element in stars?

A.

iron

B.

helium

C.

oxygen

D.

hydrogen

How many moles of solute are contained in 200 milliliters of a 1 m solution?

What changes do you shown in the model

What type of elements are found in the polyatomic ions?

While looking out the window, you see lightening flash and then 3 seconds later, you hear the thunder. How far was the lightening from you? A. 3,300 ft B. 3 miles C. 300 ft

Long-term mineral extraction has no lasting consequences. true or false

Which of the following is not a source of air pollution related to human activities

You see rainforests a is far as the eye can see It rains every day and the humidity is fiercel Where might you be? Polar climate Tropical climate Subtropical climate Temperate climate

2. A balloon is dunked into a tank of cold water. How will this affect the size of the balloon?

Which of the following correctly describes a compound?

If the [H+] of a solution is 1.0 x 10 to the power of - 2 mol/L the pH is: (pH = - log (H+] 1 12 -2 2 chemistry