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Pavel [41]
3 years ago
12

I need it done asap as fast as possible

Chemistry
1 answer:
Lubov Fominskaja [6]3 years ago
6 0

Answer:

1. B

2. D. the form of a substance changes but not its identity

3. C

4. D

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svetoff [14.1K]

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4 years ago
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2. How much heat is released when 432g of water cools down from 710C to 180C?
nadya68 [22]
The heat released by the water when it cools down by a temperature difference AT

is Q = mC,AT

where

m=432 g is the mass of the water

C, = 4.18J/gºC

is the specific heat capacity of water

AT = 71°C -18°C = 530

is the decrease of temperature of the water

Plugging the numbers into the equation, we find

Q = (4329)(4.18J/9°C)(53°C) = 9.57. 104J

and this is the amount of heat released by the water.
7 0
3 years ago
Explain in terms of types of matter why methane can be broken down by chemical means but argon cannot?
Fynjy0 [20]
Argon is a pure element which means that it cannot be broken down further than it already is. Methane, however, is a hydrocarbon, which means it is made out of both hydrogen and carbon and thus can be broken down to separate those elements.
7 0
3 years ago
Please help me match these to the boxes
mamaluj [8]

Answer:

answers from left to right:

decomposition,decomposition,synthesis,replacement,synthesis,replacement

Explanation:

6 0
3 years ago
What is the [OH-] of a substance that has a pH of 11?
Deffense [45]

Answer:

0.001 M OH-

Explanation:

[OH-] = 10^-pOH, so

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