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sergejj [24]
2 years ago
12

A student heated a blue copper sulfate crystal in a test tube. After a few minutes, she observed that the crystal turned white a

nd the inside of the test tube was covered with a thin film of water. The water inside the test tube most likely __.
Multiple choice question.

seeped through the sides of the test tube


was left from cleaning the test tube the night before


condensed from the air around the test tube


came from the blue copper sulfate crystal, which is a hydrate
Chemistry
1 answer:
kolezko [41]2 years ago
5 0

The water from inside the test tube most likely came from the blue copper sulfate crystal which is a hydrated salt.

<h3>Hydrated salts</h3>

Hydrated salts contain water of hydration.

A blue copper sulfate crystal contains water of hydration.

When heated, the water evaporates off to give an anhydrous salt which appears colorless.

The equation of the reaction is as follows:

CuSO4•5H2O -----> CuSO4 + 5H2O(g)

More on water of hydration can be found here: brainly.com/question/919417

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lisov135 [29]

Answer:

DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person's body has the same DNA.

EXPLANATION: SO THE CORRECT ANSWER IS

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7 0
3 years ago
2. What ions are present in what ratio in a solution of aqueous calcium chloride?
Alenkasestr [34]

Answer:

\mathrm{Ca}^{2+} \text { and } \mathrm{Cl} \text { - ions are present in } 1: 2 \text { ratio in a solution of aqueous calcium chloride. }

Explanation:

Here in Calcium Chloride ionic bond is present in between calcium and chlorine atoms. As we know according to Octet rule calcium have two excess atoms and for matching nearest noble gas electronic configuration. It donate two electrons to gain more stability and form \mathrm{Ca}^{2+}, while chlorine is deficient from one electron to meet nearest noble gas electronic configuration therefore two chlorine atoms accept excess electron from calcium individually and form two\mathrm{Cl}^{-} ions.

\text { Equation is as follows: } \mathrm{Ca}^{2+}+2 \mathrm{Cl}^{-} \rightarrow \mathrm{CaCl}_{2}

Hence aqueous solution of calcium chloride breaks the ionic bond pairing in one \mathrm{Ca}^{2+}and two\mathrm{Cl}^{-}ions: \mathrm{CaCl}_{2} \longrightarrow \mathrm{H}_{2} \mathrm{O} \quad \mathrm{Ca}^{2+}(\mathrm{ag})+2 \mathrm{Cl}(\mathrm{ag})

5 0
3 years ago
Gravitational force is dependent upon a. the distance and mass
Shtirlitz [24]

A.) mass and distance.

3 0
2 years ago
In terms of the atmosphere, which of the following best describes the oxygen that is present?
Viktor [21]
The atmosphere is considered homogeneous. It isn’t exactly on the smallest scales but that doesn’t matter. Homogenous means the composition will be the same in any sample taken from the substance. And clearly, the atmosphere is mostly gas. So the last answer is right
6 0
3 years ago
H2 + Cl2 --&gt; 2HCl
scZoUnD [109]

Answer:

c20 will be there ok

Explanation:

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4 0
2 years ago
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