Which of the following is not evidence of a chemical change?

A. a change in color

B. the production of a gas

C. the formation of a precipitate

D. the separation of particles

Why was the constitution made? who wrote it and what compromises did people clime to?

jasvasia is shopping on Amazon for new sunglasses. she notices a pair that she likes price changed from $32.15 to $18.99. what is the percent increase or decrease? round your answer to the nearest tenth.

Pieces of metal are welded together in an atmosphere of argon. Explain why an atmosphere of argon is used.

Atoms of elements that are in the same group have the same number of a-protons b-neutrons c-valence electrons d-protons and neutrons

Problem 12.002 the molar analysis of a gas mixture at 30°c, 2 bar is 40% n2, 50% co2, 10% ch4. determine

what would the total pressure of a mixture of fluorine, chlorine, and bromine gases be if the partial pressure are 2.20 atm, 6.70 atm, 0.03 atm respectively

Which net change occurs in a nuclear fusion reaction? (1) Ionic bonds are broken. (2) Ionic bonds are formed. (3) Energy is converted to mass. (4) Mass is converted to energy.

You have a 1 L container of a gas at 20 C and 1 atm. Without opening the container, how could you tell whether the gas is chlorine or fluorine? a. measure the mass of the gas b. measure the speed of the gas molecules c.

In a pan of boiling water, the water moves in a circular motion.

In the following reaction, which component acts as an oxidizing agent? 10 I - (aq) + 2 MnO4 - (aq) + 16 H + (aq) → 5 I2 (s) + 2 Mn2 + (aq) + 8 H2O (l)