Chemistry Homework Help

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Atomic Theory

Q. What is the ratio in SF6? Enter your answer as an integer.

Solved • Jan 30, 2020

Atomic Theory

Q. Why does the mixture have a smaller mass following reaction?

Solved • Jan 30, 2020

Atomic Theory

Q. Watch this video, which shows the reaction between solutions of hydrochloric acid and sodium carbonate. 2 Hcl(aq) + Na2CO3(aq) → CO2(g) + H2O (ℓ) + 2 NaCl(aq) Is the mass on the scale the same after the reaction as before the reaction? a) yes b) no

Solved • Jan 30, 2020

Atomic Theory

Q. Notice that during the video, the scale reading in the mg decimal place (0.00x) varies a little. Which of the following might account for this small variation? Choose all that apply. (Select all that apply.)

Solved • Jan 30, 2020

Atomic Theory

Q. The reaction observed in this video is the precipitation of lead iodide from solutions of lead nitrate and potassium iodide. Pb(NO3)2(aq) + 2KI (aq) → PbI2(s) + 2 KNO3(aq) Does this reaction conform to the law of conservation of matter? a) yes b) no

Solved • Jan 30, 2020

Atomic Theory

Q. In the following illustration, balls of the same color represent atoms of the same element. Which of the illustrations represents a valid chemical transformation at the particulate level?

Solved • Jan 30, 2020

Atomic Theory

Q. What is the ratio of hydrogen atoms (H) to oxygen atoms (O) in 2 L of water? Enter the simplest whole number ration in order of hydrogen to oxygen, respectively. Express your answer as two integers, separated by a comma (e.g., 3,4).

Solved • Jan 29, 2020