The Review Test In Chapter 1: The Calculation In Chemistry

1. តើនិមិត្តសញ្ញា (aq) មានន័យដូចម្តេច?

សមាសធាតុរឹង

អង្គធាតុរាវ

សារធាតុរលាយក្នុងទឹក

សារធាតុមិនរលាយក្នុងទឹក

The correct answer is "សារធាតុរលាយក្នុងទឹក" which means "soluble substance in water". This answer is correct because it states that the substance dissolves in water.

Explanation

The correct answer is "សារធាតុរលាយក្នុងទឹក" which means "soluble substance in water". This answer is correct because it states that the substance dissolves in water.

2. តើអុីយ៉ុងទស្សនិកមានន័យដូចម្តេច?

ជាអុីយ៉ុងមិនរលាយក្នុងទឹក

ជាអុីយ៉ុងបំបែក និងចូលរួមប្រតិកម្ម

ជាអុីយ៉ុងអាចសម្រួលបាន ព្រមទាំងមិនចូលរួមប្រតិកម្ម

ជាអុីយ៉ុងមានវ៉ាឡង់ជាក់លាក់

The answer states that isotopes can undergo changes but do not participate in chemical reactions. This means that isotopes can undergo radioactive decay or other types of transformations, but they do not interact with other substances in a chemical reaction.

Explanation

The answer states that isotopes can undergo changes but do not participate in chemical reactions. This means that isotopes can undergo radioactive decay or other types of transformations, but they do not interact with other substances in a chemical reaction.

3. តើវ៉ាឡង់មានន័យដូចម្តេច?

ជាលទ្ធភាពចូលផ្សំនៃអាតូម ឬរ៉ាឌីកាល់ ជាមួយធាតុដទៃទៀត

ជាអេឡិចត្រុងនៅស្រទាប់ជិតណ្វៃយ៉ូជាងគេ

ជាអេឡិចត្រុងមិនចូលរួមប្រតិកម្ម

ជាអុីយ៉ុងមានវ៉ាឡង់ជាក់លាក់

not-available-via-ai

Explanation

not-available-via-ai

4. សមាសធាតុអុីយ៉ុងកើតឡើងរវាងកាចុង និងអុីយ៉ុងវិជ្ជមាន តើត្រឹមត្រូវឬទេ?

មិនត្រឹមត្រូវទេ

មិនខុសទេ

The correct answer is "មិនត្រឹមត្រូវទេ" which means "Not correct". This answer indicates that the statement "សមាសធាតុអុីយ៉ុងកើតឡើងរវាងកាចុង និងអុីយ៉ុងវិជ្ជមាន" is not accurate or true.

Explanation

The correct answer is "មិនត្រឹមត្រូវទេ" which means "Not correct". This answer indicates that the statement "សមាសធាតុអុីយ៉ុងកើតឡើងរវាងកាចុង និងអុីយ៉ុងវិជ្ជមាន" is not accurate or true.

5. 2Na+_(aq) + 2OH^-_(aq)+Cu²⁺_(aq)+ SO₄^2-_(aq) --> ..................+2Na+_(aq) + SO₄^2-_(aq)

When sodium ions (Na+) and hydroxide ions (OH-) react with copper ions (Cu2+) and sulfate ions (SO42-), they form copper hydroxide (Cu(OH)2) as a solid precipitate. The balanced chemical equation for this reaction is 2Na+(aq) + 2OH-(aq) + Cu2+(aq) + SO42-(aq) -> Cu(OH)2(s) + 2Na+(aq) + SO42-(aq). This means that two sodium ions and two sulfate ions are also present on both sides of the equation, indicating that they are spectator ions and do not participate in the actual reaction. Therefore, the correct answer is Cu(OH)2(s).

Explanation

When sodium ions (Na+) and hydroxide ions (OH-) react with copper ions (Cu2+) and sulfate ions (SO42-), they form copper hydroxide (Cu(OH)2) as a solid precipitate. The balanced chemical equation for this reaction is 2Na+(aq) + 2OH-(aq) + Cu2+(aq) + SO42-(aq) -> Cu(OH)2(s) + 2Na+(aq) + SO42-(aq). This means that two sodium ions and two sulfate ions are also present on both sides of the equation, indicating that they are spectator ions and do not participate in the actual reaction. Therefore, the correct answer is Cu(OH)2(s).

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