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IgorLugansk [536]
3 years ago
7

A reaction which needs to gives off energy to complete the chemical reactions is called an

Chemistry
1 answer:
Airida [17]3 years ago
7 0
<span>A reaction which needs to gives off energy to complete the chemical reactions is called an EXOTHERMIC reaction !!</span>
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At Jim's auto shop, it takes him minutes to do an oil change and minutes to do a tire change. Let be the number of oil changes h
Juli2301 [7.4K]

Answer:

The total time that Jim needs to change x oil changes and y tire changes is less than 180 min.

The time needed for x oil changes is 12 * x.

The time needed for y tire changes is 18 * y.

The total time is the sum of the above times and needs to be less than 180 that is

12 * x + 18 * y < 180 divide both sides of equation by 6

12/6 * x + 18/6*y < 180/6

2*x + 3*y < 30

2*x < 30 - 3*y divide both sides by 2 to get the inequality for x

x < 30/2 - 3/2*y = 15 - 1.5 y < 15 that is x < = 15

2*x + 3*y < 30

3*y < 30 - 2*x divide both sides by 3 to get the inequality for y

y < 30/3 - 2/3 *x = 10 - 2/3*x < 10 that is y < = 10

Also we can write x + y < x+ 3/2 * y < 15.

Explanation:

Jim's can do not more then 5 oil changes and not more then 10 tire changes or all together she can do not more then 15 total of oil and tire changes.

5 0
3 years ago
S
N76 [4]

Answer:

B

Explanation:

B

4 0
3 years ago
What product is released into Earth's atmosphere through the combustion of<br> fossil fuels?
mezya [45]

Answer:

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Explanation:

Fossil fuels are hydrocarbons which only contain hydrogen and carbon.

When it is burnt in air, it reacts according to this general equation:

2(CH) + 3O2 >> H2O + CO + CO2

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1 year ago
A chemical reaction is the process by which a ___ takes place
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A chemical reaction is the process by which a CHANGE takes place (?)
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