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3 years ago

Question 13 (3.33 points)

Chemistry

1 answer:

NARA [144]3 years ago

7 0

Answer:

B. City B

Explanation:

From the weather chart, you can see that rain is indicated by the dot(.) sign. One dot means light rain and two dots mean steady light rain. The circle shading will show how much cloud in the city, ranging from no cloud(white circle), half covered (half black circle) and completely covered(black circle).

City A has neither cloud nor rain.

City B is completely covered by cloud and have steady light rain.

City C is half-covered with cloud, without rain.

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katrin2010 [14]

Answer:

Harmful toxins from crops have been found in peoples blood.

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Its dangerous to mess with nature this way when it should be a natural thing.

Explanation:

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3 years ago

Which activity is an example of chemical change?

frutty [35]

An old penny rusting, remember you can’t undo a chemical change

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3 years ago

As the temperature of a gas increases, _____. (select all the options that correctly complete the sentence.)

weeeeeb [17]

As the temperature of a gas increases, the average kinetic energy of the gas particles increases and the average speed of a gas particle increases.

According to the kinetic theory of gases, all gases are made of microscopic molecules that move in straight lines until they bump into another gas molecule or object. This transfer of energy causes molecules to move around faster and bump into each other more.

Kinetic energy is proportional to the speed of the molecules. As the speed of the colliding molecules increases, so does the total kinetic energy of all the gas molecules. It's pretty difficult to measure the speed of an individual gas molecule.

Instead, temperature can be used as a measure of the average kinetic energy of all the molecules in the gas. As the gas molecules gain energy and move faster, the temperature goes up. This is why Amy feels warmer!

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2 years ago

Cells, chromosomes, Body system, DNA (smallest to largest)

ValentinkaMS [17]

Explanation:

cells, dna, chromosomes, body systems

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2 years ago

Medicinal “ether" is produced when ethyl alcohol is treated with an acid. How many grams of

DochEvi [55]

Answer:

34.3 g

Explanation:

Step 1: Write the balanced equation

2 CH₃CH₂OH ⇒ CH₃CH₂OCH₂CH₃ + H₂O

Step 2: Calculate the moles corresponding to 50.0 g of CH₃CH₂OH

The molar mass of CH₃CH₂OH is 46.07 g/mol.

50.0 g × 1 mol/46.07 g = 1.09 mol

Step 3: Calculate the theoretical moles of CH₃CH₂OCH₂CH₃ produced

The molar ratio of CH₃CH₂OH to CH₃CH₂OCH₂CH₃ is 2:1. The moles of CH₃CH₂OCH₂CH₃ theoretically produced are 1/2 × 1.09 mol = 0.545 mol.

Step 4: Calculate the real moles of CH₃CH₂OCH₂CH₃ produced

The percent yield of the reaction is 85%.

0.545 mol × 85% = 0.463 mol

Step 5: Calculate the mass corresponding to 0.463 moles of CH₃CH₂OCH₂CH₃

The molar mass of CH₃CH₂OCH₂CH₃ is 74.12 g/mol.

0.463 mol × 74.12 g/mol = 34.3 g

6 0

3 years ago