To what element does Thorium-230 (atomic number-90) decay when it emits an alpha particle (42He) ?

a. 22688Ra

c. 22886Rn

b. 23090Ra

d. 22286Rn

CH4 + O2 - > CO2+2H20 Predict the products of the chemical reaction and explaining why you made this prediction. You should identify the products of the chemical reaction.

How many grams of carbon dioxide are formed from 25 moles of octane

Is SHH harmful, beneficial, or neutral to the organism

A physical change is a change A. that does not change the identity of the substance B. That changes the identity of the substance C. In the chemical makeup of matter D. from one compound to a new compound

Which of the following statements could be true regarding polar molecules? Choose one or more: A polar molecule will not contain polar bonds. A polar molecule may have one or more lone pairs.

What water activities might be easier to do in Lake Assal's salty water? What activities could be more difficult?

The suffix "-megaly in the term gastromegaly means:

The harder you strike a drum, the greater the sound's A) medium B) volume C) frequency D) pitch

The equation X + Y 2Z has the rate law equation shown below. Which of the following statements best describes the relationship of X on the rate of the reaction? rate = k[X]2[Y] Changing X has no effect on the reaction rate.

What moves in or out of a substance during a change of state?