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mote1985 [20]
3 years ago
14

Four students report measurements of the mass of the same object. Which of the values is the least precise? A. 1,000 g B. 1,000.

0 g C. 1.0 × 10^3 g D. 1.00 × 10^3 g
Chemistry
2 answers:
Nana76 [90]3 years ago
6 0
Precision is inversely proportional to the largeness of the measurement of mass. This is because there are scales that can precisely or accurately measure smaller masses compared to larger masses. Decimals also help in determining precision. in this case, the least precise is A. 
grandymaker [24]3 years ago
4 0
The corresponding value that is the least precise would be A. As it only contains 1 value that is a significant digit, 1.
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0.10 M potassium chromate is slowly added to a solution containing 0.20 M AgNO3 and 0.20 M Ba(NO3)2. What is the Ag+ concentrati
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Answer:

[Ag^{+}]=4.2\times 10^{-2}M

Explanation:

Given:

[AgNO3] = 0.20 M

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Ksp of Ag2CrO4 = 1.1 x 10^-12

Ksp of BaCrO4 = 1.1 x 10^-10

BaCrO_4 (s)\leftrightharpoons  Ba^{2+}(aq)\;+\;CrO_{4}^{2-}(aq)

Ksp=[Ba^{2+}][CrO_{4}^{2-}]

1.2\times 10^{-10}=(0.20)[CrO_{4}^{2-}]

[CrO_{4}^{2-}]=\frac{1.2\times 10^{-10}}{(0.20)}= 6.0\times 10^{-10}

Now,

Ag_{2}CrO_4(s) \leftrightharpoons  2Ag^{+}(aq)\;+\;CrO_{4}^{2-}(aq)

Ksp=[Ag^{+}]^{2}[CrO_{4}^{2-}]

1.1\times 10^{-12}=[Ag^{+}]^{2}](6.0\times 10^{-10})

[Ag^{+}]^{2}]=\frac{1.1\times 10^{-12}}{(6.0\times 10^{-10})}= 1.8\times 10^{-3}

[Ag^{+}]=\sqrt{1.8\times 10^{-3}}=4.2\times 10^{-2}M

So, BaCrO4 will start precipitating when [Ag+] is 4.2 x 1.2^-2 M

                       

7 0
3 years ago
Drag the tiles to the correct boxes to complete the pairs.
7nadin3 [17]

The correct answer is B.

Have a great day!

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Cience, Life Science
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Answer:

I think the answer is All of these answers are correct.

4 0
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