Chemistry, 23.10.2021 16:40 linnybear300
Which is not a true statement about the evidence to support the origin of our universe?A. Galaxies are expanding at an exponential rate in the universeB. The universe is continually heating up and gaining energyC. Leftover light from the oldest light in the universe is observableD. Hydrogen makes up about 73%, and helium makes up about 25% of all the mass in the universe
Answers: 1
Chemistry, 21.06.2019 17:10
There are 6.022 x 10^23 atoms of hg in 1 mole of hg. the number of atoms in 4.5 moles of hg can be found by multiplying 4.5 by 6.022 x 10^23 a. 2.7 x 10^24 b. 27 x 10^23 c. 2.71 x10^24 d. 27.099 x 10^23
Answers: 3
Chemistry, 22.06.2019 17:30
Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".
Answers: 2
Chemistry, 22.06.2019 18:50
Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g. what is the percent by mass of water in the hydrate? %
Answers: 1
Chemistry, 22.06.2019 19:00
A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.
Answers: 1
Which is not a true statement about the evidence to support the origin of our universe?A. Galaxies a...
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