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soldi70 [24.7K]
2 years ago
15

Maria wants to enter the science fair at her school. She has a list of ideas for her project. Which questions could be answered

through scientific investigation? Check all that apply. Which marine biologist is the smartest? Does the rate of decay have an effect on the amount of gas produced? Is the information about photosynthesis difficult to understand? Which laboratory experiment is the most fun to perform? Which brand of stain remover is the best for getting out laundry stains?
Chemistry
1 answer:
omeli [17]2 years ago
5 0

Answer:

Does the rate of decay have an effect on the amount of gas produced?

Which brand of stain remover is the best for getting out laundry stains?

Explanation:

I just did it on Edge

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A container of hydrogen gas has a volume of 1.46 liters, a pressure of 2.18 atm, and a temperature of 185 Kelvin. How many moles
Masja [62]
<span>n = PV / RT hop it helps u ok</span>
6 0
2 years ago
Write the word equation for the reaction of barium nitride with potassium
Irina18 [472]

Answer:

Well this is a metathesis or partner exchange reaction....and barium sulfate is as soluble as a brick...

Explanation:

And so...

Ba(NO3)2(aq)+K2SO4(aq)→2KNO3(aq)+BaSO4(s)⏐↓

Note that you simply HAVE TO KNOW that barium sulfate is insoluble....as is lead sulfate, and as is (less so) calcium sulfate

Explanation:

8 0
2 years ago
Read 2 more answers
What is a characteristic of all fuel cells?
CaHeK987 [17]
B. Electrical energy is produced from oxidation reactions. 
I don't have an explanation for this though. Do you need one? I can probably look it up.
8 0
2 years ago
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A student is given a sample of CuSO4(s) that contains a solid impurity that is soluble and colorless. The student wants to deter
DochEvi [55]

Answer:

The impurity which is present in the solution of copper sulphate (CuSO4) is determined by the an instrument known as spectrophotometer.

Explanation:

Spectrophotometer is a device or an instrument which is used to determine the concentration of a chemical by measuring the detection of light intensity that is coming from the solution. If the solution of copper sulphate is checked through spectrophotometer, we can can determined or measure the amount of copper sulphate and the impurity in the solution.

3 0
2 years ago
A multivitamin tablet contains 40 milligrams of potassium. how many moles of potassium does each tablet contain?
katrin2010 [14]
Conversion of mole to grams
k in mole = 1 mole/ atomic mass
K in mole =1/ 39.0983 g/mole
                = 0.255765 g/mole
converting 40 grams of K
 K 40 grams x [ 1 mole/ 39.0983 grams] = 1.0230623 mole
There are 1.0230623 moles of K in 40 K of Potassium

7 0
2 years ago
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