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3 years ago

What happens to water when it freezes?

Chemistry

2 answers:

disa [49]3 years ago

8 0

Explanation:

When an object undergoes a physical change (solid to liquid, decrease in temperature etc.), the mass of the object remains constant.

When water freezes, the water molecules vibrate closer to one another and there is less space between the molecules.

The same number of water molecules now occupy a smaller volume, therefore their density increases.

The correct answer is the 3rd option.

Genrish500 [490]3 years ago

5 0

Answer:

Its density decreases

Explanation:

water expands when it freezes making it less dense than before.

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A compound accepts electrons from another substance to form a covalent bond. Which term best describes this compound’s behavior?

Cloud [144]

A compound accepts electrons from another substance to form a covalent bond. The compound acts as a Lewis base.

<h3>What are the most common acid-base theories?</h3>

Arrhenius: acids release H⁺ and bases release OH⁻.
Bronsted-Lowry: acids donate H⁺ and bases accept H⁺.
Lewis: acids accept electrons and bases donate electrons.

A compound accepts electrons from another substance to form a covalent bond. Which term best describes this compound’s behavior?

Lewis acid. YES.
Arrhenius base. NO, because OH⁻ is not involved.
Bronsted-Lowry acid. NO, because H⁺ is not involved.
Bronsted-Lowry base. NO, because H⁺ is not involved.

A compound accepts electrons from another substance to form a covalent bond. The compound acts as a Lewis base.

Learn more about Lewis acid-base theory here: brainly.com/question/7031920

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3 years ago

Which of the following changes would improve the accuracy of the molar mass measurement carried out in this experiment:

aleksandrvk [35]

A. would not help and maybe make it harder to get accurate measurements.

b. would make more delta T which will improve its accuracy

c. will also increase delta T.

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3 years ago

Which of the following could be considered a scientific statement? (2 points)

Andrej [43]

Answer:

The answer of the scientific STATEMENT is" Appears That Ants Live In Colonies."

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3 years ago

I need an analysis and conclusion, for the lab, Types of reactions

Leya [2.2K]

Answer:

Explanation:

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3 years ago

Identify which one of the three methods of analysis (i.e., TLC, IR and melting point) provides information about the structure o

Alex787 [66]

Answer:

IR provides structural information about a molecule. TLC and melting point analysis do not provide structural information.

Explanation:

IR gives information about the functional groups present in a molecule. The vibrational frequency of each functional group gives information about the structure of the entire molecule.

Structural features of a molecule are deduced by matching the vibrational frequencies of groups obtained from the IR spectroscopy with that of known functional groups in literature.

Melting point is a qualitative method that can only yield information about the identity of a compound and not its structure. Each compound has its unique melting point recorded in literature and any pure sample of the same compound must have the same sharp meting point.

Thin-layer chromatography (TLC) is a chromatography technique used to separate non-volatile mixtures. After separating the components of the mixture, it does not give any information regarding the identity or the structure of the components of the mixture.

Therefore, only IR yields structural information about a sample.

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3 years ago