Chemistry, 01.07.2019 10:30 ellllaaaxx
1. which of the following nuclear equations is correctly balanced? (choices attached) 2. the half-life of thorium-234 is 24 days. if you have a 42.0 g sample of thorium-24, how much will remain after 72 days? a. 42.0 g b. 21.0 g c. 10.5 g d. 5.25 g 3. it takes 5.2 min for a 4.0 g sample of francium-210 to decay until only 1.0 g is left. what is the half-life of francium-210? a. 1.3 min b. 2.6 min c. 5.2 min d. 7.8 min
Answers: 1
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What is the molar mass of a gas that has density of 2.054 g/l
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Chemistry, 22.06.2019 11:30
If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.
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What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.
Answers: 2
1. which of the following nuclear equations is correctly balanced? (choices attached) 2. the half-...
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