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AysviL [449]
3 years ago
8

Identify each chemical reaction as endothermic or exothermic based on its description. Drag each tile to the correct location. S

odium bicarbonate reacts with citric acid. The temperature of the reaction mixture drops by 6.8°C.Zinc powder is stirred into a beaker containing copper(II) sulfate. The beaker feels warmer to the touch.Carbon in charcoal reacts with oxygen in the air. The reaction produces heat for cooking along with carbon dioxide.The chemical equation for hydrogen reacting with oxygen shows water and energy in the product.Cold packs are used to treat sports injuries. The temperature drop in the cold pack is activated by mixing ammonium nitrate with water.Salt water can treat a sore throat. Pouring salt into the water removes some of the energy from the water.
Chemistry
1 answer:
jasenka [17]3 years ago
6 0
Are there supposed to be images because I don’t see anything?
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A spectator ion is (Select all that apply.) a. an ionic component of a reactant that is unchanged by the reaction your eye, b. c
DENIUS [597]

Correct Question:

A spectator ion is (Select all that apply.)

- a piece of french fry contaminating the reaction mixture

- an ionic component of a reactant that is unchanged by the reaction

-in this experiment, nitrate ion

- your eye, carefully watching the progress of the reaction

Answer:

- an ionic component of a reactant that is unchanged by the reaction

Explanation:

A spectator ion is an ion that exists as a reactant and a product in a chemical equation. A spectator ion is one that exists in the same form on both the reactant and product sides of a chemical reaction.

Spectator ions are ions that are present in a solution but don't take part in the reaction. When reactants dissociate into ions, some of the ions may combine to form a new compound. The other ions don't take part in this chemical reaction and are therefore called spectator ions.

The correct option is therefore the option;

- an ionic component of a reactant that is unchanged by the reaction

5 0
3 years ago
How much heat is required to raise the temperature of 81.0 g of water from its melting point to its boiling point?
Dovator [93]

Answer:

Specific heat of water = 33.89 KJ

Explanation:

Given:

mass of water = 81 gram

Initial temperature = 0°C

Final temperature = 100°C

Specific heat of water = 4.184

Find:

Required heat Q

Computation:

Q = Mass x Specific heat of water x (Final temperature - Initial temperature)

Q = (81)(4.184)(100-0)

Q = 33,890.4

Specific heat of water = 33.89 KJ

6 0
3 years ago
A student mixed some yellow sulfur powder with some iron filings. She was able to take the iron out of the sulfur by using a mag
Kay [80]

Answer: Chemical change

Explanation:

Physical change is a change in which there is no rearrangement of atoms and thus no new substance is formed. There is only change in physical state of the substance. The change can be reversed using physical methods.

Chemical change is a change in which there is rearrangement of atoms and thus new substance is formed. There may or may not be a change in physical state. The change can only be reversed using chemical methods.

Thus when iron and sulfur are heated in a test tube, the chemical change occurs and thus lead to formation of new substances which could not be separated using magnet.

8 0
2 years ago
_____ occurs when the product of the ion concentrations exceeds the Ksp.
arlik [135]
Precipitation occurs when the product of the ion concentration exceeds the Ksp.
4 0
3 years ago
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What other missions had been to Mars, and what did they accomplish?
lesya692 [45]

Answer:

they stayed alive?

Explanation:

easy

5 0
2 years ago
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