Chemistry, 12.07.2019 19:30, ferny5106

How could you show that dissolving salt in water is a physical change?

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Chemistry, 22.06.2019 17:30, llamasking

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

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Chemistry, 22.06.2019 18:00, rodriguezscarlet1713

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?

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Chemistry, 22.06.2019 23:40, tilievaughn14

What energy conversion occurs when a sling shot is used to shoot a rock across the room? (2 points) question 2 options: 1) stored mechanical energy is converted to mechanical energy. 2) stored mechanical energy is converted to radiant energy. 3) gravitational energy is converted to radiant energy. 4) gravitational energy is converted to mechanical energy.

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Chemistry, 23.06.2019 11:10, brcribb

Why would a doctor most likely restrict a patient's contact with other people while the patient receives internal radiation