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guapka [62]
3 years ago
11

Who asks scientific questions?

Chemistry
2 answers:
Katena32 [7]3 years ago
6 0

Answer:

I think its c I'm not that sure tho

abruzzese [7]3 years ago
4 0
Answer:
D. anyone who observes the physical world

explanation:
anyone can ask scientific questions if they understand the physical world not just scientists or educated people.
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Chemical compounds undergo both physical and chemical changes. Which of the following is an example of a chemical change
rjkz [21]
Combining oxygen gas and hydrogen gas to form liquid water is a chemical change. Pretty sure the rest are physical changes because a chemical change happens when a substance is altered completely. A physical change is when a substance keeps its components (I dunno what word to use) but just changes into a diferent shape. At least thats how my teacher explained it to me.
8 0
3 years ago
How can constraints be used to help define the problem?
vitfil [10]

Answer:

Constraints are restrictions that need to be placed upon variables 

Explanation:

Constraints are restrictions (limitations, boundaries) that need to be placed upon variables used in equations that model real-world situations. It is possible that certain solutions which make an equation true mathematically, may not make any sense in the context of a real-world word problem.

6 0
3 years ago
A large cylindrical tank contains 0.750 m3 of nitrogen gas at 27°C and 7.50 * 103 Pa (absolute pressure). The tank has a tight‐f
Nuetrik [128]

Answer: The answer is 68142.4 Pa

Explanation:

Given that the initial properties of the cylindrical tank are :

Volume V1= 0.750m3

Temperature T1= 27C

Pressure P1 =7.5*10^3 Pa= 7500Pa

Final properties of the tank after decrease in volume and increase in temperature :

Volume V2 =0.480m3

Temperature T2 = 157C

Pressure P2 =?

Applying the gas law equation (Charles and Boyle's laws combined)

P1V1/T1 = P2V2/T2

(7500 * 0.750)/27 =( P2 * 0.480)/157

P2 =(7500 * 0.750* 157) / (0.480 *27)

P2 = 883125/12.96

P2 = 68142.4Pa

Therefore the pressure of the cylindrical tank after decrease in volume and increase in temperature is 68142.4Pa

8 0
3 years ago
Need help Converting 4.82 mmol to grams. Compound is KMn04/CuSO4*5H20
allsm [11]

Answer:

Mass of the substance, grams

86.8

Molar mass of the substance

18.0

Molar mass details

2.0160 H (2*1.008) + 15.9990 O (1*15.999)

6 0
3 years ago
The purpose of photosynthesis is to produce usable chemical energy or glucose from solar energy. If the formula for glucose is C
nasty-shy [4]

#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.

4 0
4 years ago
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