If the temperature changes in a chemical reaction, what has occured?

A) energy was destroyed

B) energy was created

C) there was no energy transfer

D) energy was transferred

Zinc has the chemical symbol Zn and the atomic number 30. How many protons, neutrons, and electrons does an atom of zinc-69 have? A. 30 protons, 39, neutrons, 39 neutrons B. 39 protons, 30 neutrons, 30 neutrons C.

What is the converse of the conditional statement? Ifx is even, then x + 1 is odd. If x is not even, then x + 1 is not odd. Ifx + 1 is odd, then x is even. Ifx + 1 is not odd, then x is not even Ifx is even, then x + 1 is not odd.

What is fractional distillation?

What percentage of visible stars are closer to Earth than the sun?

A 4.10-mole sample of helium gas at 28°C takes up a volume of 3.28 L. Determine the pressure of helium in units of atm.

A gas occupies a 1.5 L container at 25 degrees Celsius and 2.0 atm. If the gas is transferred to a 3.0 L container at the same temperature, what will be its new pressure? a) 3.0 atm b) 2.0 atm c) 1.0 atm d) 4.0 atm

The maximum amount of n2h4 (hydrazine) that can be prepared from 14 grams of nitrogen and 28 grams of hydrogen by the reaction n2 + 2 h2 = n2h4 is?

The molecules of a substance are moving rapidly in a container. The molecules do not interact with each other. If the container is opened, the molecules will escape from the container.

Why is fluorine a gas?

What is the empirical formula for a compound if a sample contains 3.72g of p and 21.28g of cl?-pcl5-pcl3-p2cl10-p2cl5