Chemistry, 05.12.2019 08:31, plshelpme53

What does a model of an automobile engine system look like?

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Chemistry, 22.06.2019 12:00, sophiaa23

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

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Chemistry, 22.06.2019 12:30, johnsont8377

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

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Chemistry, 22.06.2019 22:00, choatefarmsus

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.

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Chemistry, 23.06.2019 06:40, hackman1216

The combustion of methane, ch4, releases 890.4kj/mol. that is, when one mole of methane is burned,890.4 kj are given off to the surroundings. this meansthat the products have 890.4 kj less than the reactants. thus, ah for the reaction = - 890.4 kj. a negative symbolforah indicates an exothermic reaction. ch (g) + 20 (g)> co2 (g) + 2 h0 (1); ah = - 890.4 kga) how much energy is given off when 2.00 mol of ch, are burned? b) how much energy is released when 22.4g of ch. areburned?