CHEMISTRY HIGH SCHOOL

Which of the following best describes what happens when molecular compounds melt? A.) Molecules separate into their component atoms. B.)Molecules move more slowly. C.) Molecules arranged in an irregular pattern change to a regular pattern. D.) Molecules arranged in a regular pattern change to an irregular patter.

Answers

Answer 1
Answer: I think the correct answer from the choices listed above is option D. When a molecular compound melts, they undergo the process of phase change from solid to liquid therefore molecules arranged in a regular pattern change to an irregular pattern. Hope this answers the question.

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Which of these traits does not cause a change in the reaction rate? A. density B. temperature C. concentration D. particle size

Answers

Density does not affect the rates of reaction since it doesn't have any effect on the reactivity of the molecules. Density is a physical characteristic that doesn't play into its chemical makeup and thus does not affect the rates of reaction

Simple chem question - please help!Given the equation: N2 +2O2 → 2NO2, what mass of oxygen is required to react completely with 7g of nitrogen?

A) 8 g
B) 16 g
C) 32 g
D) 64 g

Answers

Molar mass O₂ = 32.0 g/mol and N₂ = 28.0 g/mol

 N₂ +2 O₂ → 2 NO₂

28.0 g -------> 32.0 * 2
7 g ----------> ?

Mass of O₂ = 7 * 32.0 * 2 / 28.0

Mass of O₂ = 448 / 28.0

= 16 g of O₂

Answer B

hope this helps!

Answer:

guy above is right

Explanation:

What is the mass of an electron?A. Electrons do not have mass.
B. -1.0 amu
C. 0.0005 amu

Answers

Option C: 0.0005 amu (i.e. atomic mass units), approx.

Prehistory can be described as _____.what happened last year
what happened millions of years ago
the time prior to the use of written records

Answers

The way we usually think of history is the time of written records; or similar records(auditory, video) when we have direct evidence of what happened as opposed to reconstructing it from archaeological evidence. Pre-history is the time before this:  the time prior to the use of written records

Which of the following elements is not a metalloid?A. boron
B. sulfur
C. silicon
D. arsenic

Answers

sulfur is the answer!
others are metalloid!

A 133.8-gram sample of bronze was 10.3% tin by mass. Determine the total mass of tin in the sample.

Answers

You just need to multiply the total mass by the decimal value of the part that is tin. 133.8*0.103=13.8g (following the rules of significant figures).
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