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Lorico [155]
3 years ago
5

The purpose of photosynthesis is to produce usable chemical energy or glucose from solar energy. If the formula for glucose is C

6H12O6, how many atoms of carbon are used to produce the glucose?
A) 1
B) 2
C) 6
D) 9

During chemistry lab, Mrs. Black’s students placed an antacid tablet in a zip lock bag. They recorded the mass of the tablet in the bag. Then they carefully added 50 grams of water and quickly sealed the bag. The tablet began to fizz and soon disappeared. The bag was filled with gas and it felt cold to the touch.
What type of change occurred in the bag and how can you support your answer?
A) It is a physical change because the tablet dissolved.
B) It is a physical change as evidenced by change in temperature.
C) It is a chemical change due to the change in temperature and gas production.
Eliminate
D) It is a chemical change because the tablet dissolved and the temperature of the liquid dropped.
Chemistry
1 answer:
nasty-shy [4]3 years ago
4 0

#1 is 6

#2 During chemistry lab, Mrs. Black’s students placed an antacid tablet in a zip lock bag. They recorded the mass of the tablet in the bag. Then they carefully added 50 grams of water and quickly sealed the bag. The tablet began to fizz and soon disappeared. The bag was filled with gas and it felt cold to the touch.

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Element Molar Mass (g/mol)
artcher [175]

The number of moles of ethanol the chemist will use in the experiment involving 30g of ethanol is 0.65moles.

<h3>How to calculate number of moles?</h3>

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass. That is;

no. of moles = mass ÷ molar mass

According to this question, a chemist will use a sample of 30 g of ethanol (CH3CH2OH) in an experiment. The number of moles can be calculated as follows:

Molar mass of ethanol = 12(2) + 1(5) + 17 = 46g/mol

no of moles = 30g ÷ 46g/mol

no. of moles = 0.65moles

Therefore, the number of moles of ethanol the chemist will use in the experiment involving 30g of ethanol is 0.65moles.

Learn more about moles at: brainly.com/question/1458253

6 0
2 years ago
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What is the difference between an atone and a molecule
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Answer:

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Molecules contain two or more atoms and are held together by covalent bonds, whereas compounds are held together by ionic bonds. Two or more elements bonded together through ionic attraction. ... The atoms within a compound also must be different from each other, whereas a molecule can consist of only one element

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Answer:

Glucose and oxygen are required for cellular respiration. As the law of conversation states, in a biochemical reaction, mass is conserved. The mass of hydrogen in the glucose is therefore conserved in the water molecules products.

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Evaluate the following conversion. Will the answer be correct? Explain. If incorrect, how could you adjust one of the factors to
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Given :

Rate = 75 m 1 s×60 s 1 min×1 h 60 m.

To Find :

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Solution :

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Putting value of min and hour in seconds , we get :

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Yes, this experiment is also an example of a chemical reaction. The original substance, hydrogen, disappeared, and a new substance, water, was formed.

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