CHEMISTRY HIGH SCHOOL

Which bond pair does not have a polar covalent bond?A. P – Cl



B. O – H



C. S – Cl



D. H – Cl



E. Cl – Cl

Answers

Answer 1
Answer: The answer is E. Cl -- Cl

Chloride, Cl2, has a non-polar covalent bond because both molecules making up the compound are identical. This results to a diatomic molecule, which are known non-polar molecules. Since both sides of the bond are also the same, there is equal sharing of electrons. Polar covalent bonds are those that have unequal sharing of electrons.

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How many significant digits are in the mass measurement 0.025 g? (a) 1 (B) 2 (c) 3 (d) 4 (e) none of the above

Answers

The answer is B. Only the 2 and the 5 are significant numbers.

Final answer:

The measurement 0.025 g has two significant digits. Leading zeroes are not counted as significant.

Explanation:

The correct answer to the question is (b) 2. The number 0.025 g has two significant digits.

In Physics, a significant digit is any non-zero digit or any embedded or trailing zeroes in a number. Leading zeros, which are zeros at the beginning of a decimal number, are not considered significant digits. In the number 0.025 g, the leading zeros are not counted as significant because they only indicate the decimal place of the significant digits (in this case, the digits 2 and 5). Therefore, the number of significant digits is 2.

Learn more about Significant Digits here:

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What joint allows a small amount of movement?

Answers

Cartilaginous joints allow for a small amount of movement.
These joints are made of cartilage, which is a flexible connective tissue. Cartilage is less rigid than bone, but doesn't have as much flexibility as muscle.

How does adding a non-volatile solute to a pure solvent affect the boiling point of the pure solvent?The solvent will have a lower boiling point.

The solvent will have a higher boiling point.

The solvent's boiling point will not be affected.

The solvent's boiling point will most likely change, but not in a predictable way.

Answers

The correct answer is the second statement. The solvent will have a higher boiling point. Adding a non-volatile solute to a pure solvent will increase the boiling point of the solvent. This solution exhibit colligative properties. Colligative properties depend on the amount of solute dissolved in a solvent. These set of properties do not depend on the type of species present. 

Question: (a) Evaporation of water is a _____ change. A) Physical B) Chemical C) Biological D) None of the above

Answers

Answer:

Chemical change

Explanation:

This type of change is reversible, as the water vapor can condense back into liquid water under the right conditions.

Why the planets are arranged as they are in our solar system.​

Answers

Answer:

The order and arrangement of the planets and other bodies in our solar system is due to the way the solar system formed. Nearest the Sun, only rocky material could withstand the heat when the solar system was young. For this reason, the first four planets—Mercury, Venus, Earth and Mars—are terrestrial planets.

Explanation:

How many Atoms are in 2.3 g of Na? show your work and these question will take two steps

Answers

Use stoichiometry and convert 2.3 grams of sodium to moles. Then convert the moles to atoms using 6.02(10)^23.

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