If there were 10 grams of a radioactive isotope, how much of the sample would be left after 1 half-life? How much after 2 half-lives?

What takes place when you inhale and exhale

Select the correct answer. How does activation energy affect a chemical reaction? A. It increases the energy of the reactants. B. It determines how difficult it is to start the reaction. C. It determines how much product can form. D.

Which of these describes the electrostatic force a. particles of the same charge repel each other b. particles of different masses repel each other c. particles of opposite charge repel each other d. particles without charge repel each other

A vertical piston-cylinder device contains water and is being heated. During the heating process, 70 kJ of heat is transferred to the water, and heat losses from the side walls amount to 8 kJ.

Of the following examples, which is likely to contain plasma? lightning ocean air the moon

The data below were collected for the following reaction at 500 ∘C: CH3CN (g) →CH3NC (g) Time (h) [CH3CN] (M) 0.0 1.000 5.0 0.794 10.0 0.631 15.0 0.501 20.0 0.398 25.0 0.

How do i convert 3.00 moles H2 to molecules?

How can you use the chemical formulas for sucrose (C6H, 20,) and rust (Fe, O,) to classity them ionic or molecular compounds?

What is true of energy as is passes through an ecosystem? a. All of the energy in an organism is used by the animal that eats it. b. Any stored energy in an organism is used by the animal that eats it. c.

Which can associate a suspect and the firing of a gun? (its not b) A) markings on the gun's exterior B) markings on the casing C) markings on the bullet D) powder residues