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andrew-mc [135]
3 years ago
8

What is the atomic number of arsenic (As)? O A. 33 O B. 15 C. 75 D. 4 SUB

Chemistry
2 answers:
mr_godi [17]3 years ago
6 0
The atomic number of arsenic is 33
stepan [7]3 years ago
5 0

Answer:

33

Explanation:

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A solution is made by dissolving 9.74 g of sodium sulfate in water to a final volume of 165 mL of solution. What is the weight/w
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Answer: The weight/weight % or percent by mass of the solute is 5.41 %.

Explanation:

Mass of the sodium sulfate,w = 9.74 g

Volume of the water = 165 mL

Density of the water = 1 g/mL

Density=1 g/mL=\frac{\text{Mass of water}}{\text{Volume of water}}

Mass of the water =1 g/mL\times 165 mL=165 g

Mass of the solution, W:

Mass of solute + Mass of solvent =9.47 g + 165 g=174.47 g

w/w\%=\frac{w\times 100}{W}=\frac{9.45 g\times 100}{174.47 g}=5.41 \%

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3 years ago
A 2.5 mg sample of magnesium powder is ignited with 2 mg oxygen in a sealed container. All of the magnesium is consumed and 4.15
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Total mass of product = 4.15 mg

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Why is it important for scientists to review and repeat the work of other scientists?
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Scientists repeat experiments for reliability.  Experiments have to be repeated, since performing an experiment only once, does not prove a scientists theory on the experiment, which they develop by performing the experiment.  And then performing the experiment again or even many times to prove or disapprove their theories.  Btw, before an experiment begins, the scientist will make a hypothesis of what they believe will happen.  If proven correctly, they would then use those results they record throughout the experiment, from beginning to end to prove whether or not their hypothesis are correct or incorrect.  Click to let others know, how helpful is it


Read more on Brainly.com - brainly.com/question/2613050#readmore


So that they can prove the other scientists views wrong and develop a new theory in which there is more sense and credibility.  

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BASICALLY, I THINK THE ANSWER IS 1 OR 2 OR

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The Density Calculator uses the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V). The calculator can use any two of the values to calculate the third. Density is defined as mass per unit volume.

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