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makvit [3.9K]
3 years ago
15

A sample of metal is heated until it melts and begins to glow red. When it cools, it appears the same color as it did before it

was heated. This is evidence that a chemical reaction occurred. is it true or false
Chemistry
1 answer:
frosja888 [35]3 years ago
8 0

Answer:

Explanation:

trueeeeeeeeeeeeeeeeeeeeeeeeeee

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27 g of Al will react with how much mass of O2 to produce Al2O3
snow_tiger [21]
24g 4Al+3O2=2Al2O3
27g x(g)
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5 0
4 years ago
Farmers in certain state lose 2.3 x 10 kg of topsoil in a year on average. There are 4.5 x 100
Nataly_w [17]
Loss * farmers = total loss
4.5 x 100 = 450 farmers
(2.3 x 450) x 10 loss
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6 0
3 years ago
Describe how you would use the information depicted in the potential energy diagram below to determine the enthalphy change of t
Oliga [24]

When the formation of a substance is negative, it means that it releases heat to the surroundings. When it releases heat to the surroundings, the reaction is exothermic. When it absorbs heat from the surroundings, the reaction is endothermic.

5 0
4 years ago
Explain what is in a buffer. Discuss the function of a buffer. How will pH change when small amounts of acids or bases are added
AnnyKZ [126]

Answer:

Is a substance that can maintain  certain range of pH

Explanation:

A buffer is mixture of two salts that are complementary, one salt is acid and another is basic, but since then share some part of their structure, if you add to this mixture another acid, the basic salt can absorb it and still maintaining the same pH. If you pour a base, the acid salt will absorb it and again the final pH will remain the same. So the buffers are used to maintain the same pH does not matter if you add small quantities of an acid or base.

5 0
3 years ago
50 POINTS.
Vladimir79 [104]

#1. The correct answer is A.

#2. The correct answer is

      -A.  Minimum Viable Population (MVP)

      -B.  Increase.

      -C. Death rate decreases.

#3. The correct answer is B.

#4. The correct answer is B.

#5. The correct answer is:

-A. Decrease.

-B. Decrease.

-C. Increase.

-D. Decrease.

-E. Increase.

Hope this helps ya!! (:

7 0
4 years ago
Read 2 more answers
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