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ololo11 [35]
3 years ago
11

Loretta and her friends want to find out which of their pets can run the fastest. Which kind of scientific investigation should

they use?
A. a field study
B. a controlled experiment
C. development of a model
D. a review of existing work​
Chemistry
2 answers:
Feliz [49]3 years ago
7 0
A. and D. would be the best pick for this sort of experiment, but maybe (unlikely) B. because you could see how they could react in certain situations, how they react to danger but I suggest A.

Hope this helps you ☁︎☀︎☁︎
brock2 years ago
0 0

B for study island

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14.A 4.25 gram sample of an unknown gas is found to occupy a volume of 1.70 L at a pressure of 883 mm Hg and a temperature of 58
Iteru [2.4K]

Answer:

58.5g/mol

Explanation:

Given parameters:

Mass of gas  = 4.25g

Volume  = 1.7L

Pressure  = 883mmHg

                760mmHg  = 1 atm

                883mmHg  = \frac{883}{760}   = 1.16atm

Temperature  = 58°C  = 58 + 273  = 331K

Unknown:

Molar mass of sample  = ?

Solution:

To solve this problem, we use the ideal gas equation to find the number of moles;

            PV  = nRT

 P is the pressure

V is the volume

n is the number of moles

R is the gas constant  = 0.082atmdm³mol⁻¹K⁻¹

 T is the temperature

           n  = \frac{PV}{RT}   = \frac{1.16 x 1.7}{0.082 x 331}   = 0.07mole

 Since;

            mass  = number of moles x molar mass

            4.25  = 0.07 x molar mass

 Molar mass  = 58.5g/mol

7 0
3 years ago
7. Which statement about scientific consensus is true?
Helen [10]
The answer is b, the only way to prove a theory true. Hope this helps :)
8 0
3 years ago
Please please help me
ivolga24 [154]
The answer is number four but the same time I don’t really know it’s like ha ha ha ha ha ha ha ha ha ha sorry
5 0
3 years ago
Work file: climate and weather; what’s the difference
Deffense [45]

Answer: Weather refers to short term atmospheric conditions while climate is the weather of a specific region averaged over a long period of time. Climate change refers to long-term changes.

7 0
3 years ago
Draw the major organic product for the reaction of 1-phenylpropan-1-one with the provided phosphonium ylide.
prohojiy [21]

Answer:

2-methylene propylbenzene

Explanation:

The Wittig Reaction is a reaction that converts aldehydes and ketones into alkenes through reaction with a phosphorus ylide.

The ketone in this case is 1-phenylpropan-1-one. The provided phosphonium ylide is shown in the image attached. The reaction involves;

i) alkylation  

ii) addition

The product of the major organic product of the reaction is 2-methylene propylbenzene.

4 0
3 years ago
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