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2 years ago

Which element is shown below? How do you know?

Chemistry

1 answer:

LiRa [457]2 years ago

6 0

It’s Neon (Ne). You know because there are 10 protons and the number of protons is equal to the atomic number of an element. (Neon is #10 on the periodic table)

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Which statement best explains how the conditions identified in Part A affect the availability of opal?

viktelen [127]

Answer:

Explanation:

5 0

3 years ago

You are presented with a white solid and told that due to careless labeling it is not clear if the substance is barium chloride,

Lady bird [3.3K]

The given salts are Barium chloride, lead chloride and zinc chloride.

The balanced chemical reaction between barium chloride and sodium sulfate:

$BaCl_{2}(aq)+Na_{2}SO_{4}(aq)-->2NaCl(aq)+BaSO_{4}(s)_{white precipitate}$

The balanced chemical reaction between lead chloride and sodium sulfate:

$PbCl_{2}(aq)+Na_{2}SO_{4}(aq)-->2NaCl(aq)+PbSO_{4}(s)_{white precipitate}$

The balanced chemical reaction between zinc chloride and sodium sulfate:

$ZnCl_{2}(aq)+Na_{2}SO_{4}(aq)-->2NaCl(aq)+ZnSO_{4}(aq)$

Both Barium chloride and lead chloride produce a white precipitate of their respective sulfates upon reaction with sodium sulfate. But BaCl2 is readily soluble in water where as Lead chloride is insoluble in water.

Therefore, the compound is barium chloride.

5 0

3 years ago

Calculate the mass of 9.0x10^17 molecules of He gas at STP

Brrunno [24]

$6,02*10^{23} \ \ \ \ \ \rightarrow \ \ \ \ 4g \ He\\
9,0*10^{17} \ \ \ \ \ \ \rightarrow \ \ \ \ m_{x}\\\\
m_{x}=\frac{9*10^{17}*4g}{6,02*10^{23}}\approx5,98*10^{-6}g$

3 0

3 years ago

Chris investigates the conservation of mass during a chemical reaction. He measures the mass of the reactants before the reactio

seraphim [82]

Answer:

Repeat the experiment several times to make sure the results are reliable.

Explanation:

The best way for Chris to validate his results is to repeat the experiment several times to make sure the results are reliable.

For a hypothesis to be accepted it must be testable.

The more standard data points obtained from an experiment, the more the reliability index increases.
Chris should not just conclude with one data point.
In fact, most scientist prefers to use up to 30 data points before reliability can be assumed.
So, Chris should repeat the experiment as much as possible to make sure the results are reliable.

8 0

3 years ago

What are the chemical properties properties of spray paint?

melisa1 [442]

There is acetone, xylene, and toluene in spray paint

8 0

4 years ago

Read 2 more answers