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Simora [160]
3 years ago
9

What does chemistry mean

Chemistry
1 answer:
alina1380 [7]3 years ago
7 0

Answer:

<em>The branch of natural science that deals with the composition and constitution of substances and the changes that they undergo as a consequence of alternations in the constitution of their molecules is chemistry.</em>

Explanation:

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An organic synthesis to make the pain reliever acetaminophen is supposed to produce 280 kg of product but instead produces 70 kg
Irina-Kira [14]

Answer: 75%

Explanation:

The following information can be gotten from the question:

Waste = 70kg

Theoretical yield = 280kg

Therefore, the actual yield will be the difference between the theoretical yield and the waste which will be:

= 280kg - 70kg = 210kg

The percent yield will now be:

= Actual yield / Theoretical yield × 100

= 210/280 × 100

= 3/4 × 100

= 75%

4 0
3 years ago
Read the excerpt from a reading passage titled "Matter and Energy: Evaporation and Condensation." Condensation An example of con
mestny [16]

Answer : The correct option is (C) : Dew forms on grass when water vapor forms when molecules cool and join together.

Explanation :

Air contains a small amount of water vapors. When the temperature of an object is lowered than the ambient temperature, the vapors get condensed and small water droplets are formed on the object.

During night time, when the temperature is lowered, the blades of grass become cool. As a result, the vapor molecules slow down and eventually come close to each other. They join together to form liquid water which gets deposited on the blades in the form of dew drops.

The only option that explains this process is option C.

3 0
3 years ago
A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element sh
IgorC [24]

Answer:

Most likely N or S it might not be safe but that is what experiments do I guess.

Explanation:

4 0
3 years ago
Read 2 more answers
a gas that exerts a pressure of _____ bar in a container with a volume of 0.5650 L will exert a pressure of 715.1 bar when trans
vampirchik [111]
Boyle's law gives the relationship between pressure and volume of gases.
it states that for a fixed amount of gas at constant temperature, pressure of gas is inversely proportional to volume.
PV = k
where P - pressure , V - volume and k - constant 
P1V1 = P2V2 
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
substituting this equation 
P x 0.5650 L = 715.1 bar x 1.204 L
P = 1 524 bar

8 0
3 years ago
How many moles are in 0.0073 kg of tantalum?
Citrus2011 [14]
Tantalum is the 73rd element in the periodic table with an atomic mass equal to 180.95 g/mol. To determine the number of moles present in the given mass of tantalum above, we simply divide the mass by the atomic mass. 
                   number of moles = (0.0073 kg)(1000 g/ 1kg) ÷ (180.95 g/mol)
                   number of moles = 0.0403 moles
Therefore, there is approximately 0.0403 moles of tantalum in 0.0073 kg. 
4 0
3 years ago
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