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timurjin [86]
3 years ago
12

A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which would be the bes

t demonstration that she could use?
A) Bending a piece of aluminum

B) Breaking a matchstick

C) Dissolving sugar in water

D) Burning a candle
Chemistry
2 answers:
Citrus2011 [14]3 years ago
7 0
Burning a candle is the anwser 
fiasKO [112]3 years ago
7 0
Dissolving sugar in water. With the sugar dissolving, it shows both chemical and physical changes
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When adding the measurements 42.1014 g + 190.5 g, the answer has ___ significant figures.
andrezito [222]

Answer: The answer has 7 significant figures

Explanation:

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_______________ is when a compound containing carbon and hydrogen (and sometimes oxygen) combines with oxygen gas to produce car
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C. Combustion

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Describe what the greenhouse effect is and how it is caused on a molecular level.
Leokris [45]

Answer:

Solar energy absorbed at Earth’s surface is radiated back into the atmosphere as heat. As the heat makes its way through the atmosphere and back out to space, greenhouse gases absorb much of it. Why do greenhouse gases absorb heat? Greenhouse gases are more complex than other gas molecules in the atmosphere, with a structure that can absorb heat. They radiate the heat back to the Earth's surface, to another greenhouse gas molecule, or out to space.

There are several different types of greenhouse gases. The major ones are carbon dioxide, water vapor, methane, and nitrous oxide. These gas molecules all are made of three or more atoms. The atoms are held together loosely enough that they vibrate when they absorb heat. Eventually, the vibrating molecules release the radiation, which will likely be absorbed by another greenhouse gas molecule. This process keeps heat near the Earth’s surface. Most of the gas in the atmosphere is nitrogen and oxygen, which cannot absorb heat and contribute to the greenhouse effect.

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2 years ago
Which statement correctly describes the differences between positive and negative acceleration?
Serga [27]

C. Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed. ( I put A & it was not the correct answer, the answer was C )

4 0
3 years ago
2. Which of the following elements does not lose an electron easily? (a) Na (6) F (c) Mg (d) Al​
vaieri [72.5K]

Answer:

Answer: (b) F

Explanation:

Sodium has 1, magnesium has 2 and Aluminium has 3 electrons in its outermost shell whereas Fluorine has 7 electrons in its outermost shell hence Fluorine does not lose electrons easily.

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3 0
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