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LenaWriter [7]
3 years ago
5

You've made a hot drink by dissolving a teaspoon of instant coffee and a teaspoon of sugar in a cup of hot water. Which of the f

ollowing statements is true? Group of answer choices The water is the solute portion of the drink. The instant coffee and sugar dissolve because they have no charged regions to repel the partial positive and partial negative regions of the water molecules. The instant coffee and sugar are solvents. You've just prepared an aqueous solution.
Chemistry
1 answer:
ollegr [7]3 years ago
3 0

Answer: The statement, you've just prepared an aqueous solution is true.

Explanation:

When one or more number of substances are dissolved in a solvent like water then solution formed is called an aqueous solution.

For example, when a hot drink is made by dissolving a teaspoon of instant coffee and a teaspoon of sugar in a cup of hot water is an aqueous solution.

Here, both coffee and sugar are solute whereas hot water is the solvent.

Thus, we can conclude that the statement, you've just prepared an aqueous solution is true.

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A chemist mixes 75.0 g of an unknown substance at 96.5°C with 1,150 g of water at 25.0°C. If the final temperature of the system
AleksAgata [21]
To do this problem it is necessary to take into account that the heat given by the unknown substance is equal to the heat absorbed by the water, but considering the correct sign:

-m\cdot c_e\cdot \Delta T = m_w\cdot c_e_w\cdot \Delta T_w

Clearing the specific heat of the unknown substance:

c_e = \frac{m_w\cdot c_e_w\cdot \Delta T_w}{m\cdot \Delta T} = -\frac{1\ 150\ g\cdot 4.184\frac{J}{g\cdot ^\circ C}\cdot (37.1 - 25.0)^\circ C}{75\ g\cdot (37.1 - 96.5)^\circ C}

c_e = -\frac{1\ 150\ g\cdot 4.184\frac{J}{g\cdot ^\circ C}\cdot 12.1^\circ C}{75\ g\cdot (-59.4)^\circ C} = \bf 13.07\frac{J}{g\cdot ^\circ C}
6 0
3 years ago
6th grade help me pleaseeee
lozanna [386]

Answer:

D

Explanation:

The atomic number is the amount of protons in the nucleus of every atom in a specific substance

Hope this helps!

4 0
3 years ago
Read 2 more answers
The nitrate anion is Select one: a. a strong acid. b. a strong base. c. amphoteric. d. a strong reducing agent. e. a strong oxid
svp [43]

Answer: Option (e) is the correct answer.

Explanation:

Chemical formula of a nitrate ion is NO^{-}_{3} and it acts as a strong oxidizing agent because it itself gets reduced easily.

As we know that an oxidizing agent tends to oxidize other substances by itself gaining electrons. As a result, there will occur a decrease in its oxidation state.

The oxidation number of nitrogen in NO^{-}_{3} is +5. So, it gains electrons and helps in oxidizing other substances.

Thus, we can conclude that the nitrate anion is a strong oxidizing agent.

6 0
3 years ago
Why does electronegativity decrease from right to left within a period?
Firlakuza [10]

Explanation:

so, as you move down a group on the periodic table, the electronegativity of an element decreases because the increased number of energy levels puts the outer electrons very far away from the pull of the nucleus. electronegativity increases as you move from left to right across a period on the periodic table.

4 0
3 years ago
Please help! This is for chemistry!!!!
schepotkina [342]

Answer:17.9 grams

Explanation:I took the quiz

Hope this helps

3 0
2 years ago
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