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2 years ago

Explain how the copper could be in the lake sample near the picnic area but not have been detected by this test.

Chemistry

1 answer:

Masja [62]2 years ago

8 0

Answer:

May be the instrument is incorrect or may be error in it.

Explanation:

The copper have not been detected by this test because the test may be not for the detection of copper, may be it is used for identification of another minerals. If there is copper in the lake sample but can't be detected in the test so it means that the instrument which is used for detection is not the right one or having error in that instrument. Every mineral has a specific type of instrument that detect its presence, if we use incorrect instrument for the mineral then we can't detect the presence of that specific mineral.

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Calcium reacts with hydrochloric acid,HCI, to make calcium chloride and hydrogen gas (H2).

aleksandr82 [10.1K]

Answer:

1.)calcium+hydrochloric acid -->calcium chloride +hydrogen

2.)Ca + 2HCl -->CaCl2 + H2

3.)3.55g

Explanation:

1.) pretty self explanatory

2.)Ca + HCl -->CaCl2 + H2

then balance

Ca + 2HCl -->CaCl2 + H2 (+2 infront of Hcl)

3.) take calcium and calcium chloride

Ca + CaCl2

then you need the relative atomic mass of both

Ca=40

CaCl2=71 (40+(35.5x2))

Ca=40 40/40=1 1x2=2g

Then repeat that exact equation for calcium chloride

CaCl2=71 71/40=1.775 1.775x3=3.55g

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AlladinOne [14]

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For the following, identify the most likely value for x.a. BHx b. CHx c. NHx d. CH2Clx

vekshin1

Given :

a. $BH_x$ b. $CH_x$ c. $NH_x$ d. $CH_2Cl_x$ .

To Find :

Find the most likely vale of x for each one .

Solution :

a . $BH_x$

Because boron have valency of 3 .

So , x = 3 .

b . $CH_x$

Valency of carbon is 4 .

x = 4 .

c . $NH_x$

Valency of nitrogen is 3 .

Therefore , x = 3 .

d . $CH_2Cl_x$

Now ,we know valency of carbon is 4 and hydrogen is 1 .

Also , two hydrogen are already there .

So , only 2 electrons left to share .

Since , chlorine have valency of 1 .

Therefore , only 2 electrons of chlorine can connect .

x = 2 .

Hence , this is the required solution .

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Answer:

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Explanation:

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