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Elena-2011 [213]

1 year ago

12

HELP PLS.. I’LL MARK U BRAINLIEST!

1 answer:

lakkis [162]1 year ago

3 0

Old and inefficient mining smokestacks contaminate the soil around abandoned mine sites.

<h3>What are mines?</h3>

A mine is an area from which natural resources are extracted such as coal, metals, etc. A mine is known to be the source of many heavy metals as well as acid.

As such the statement that does not represent the impact of mining services is that; "Old and inefficient mining smokestacks contaminate the soil around abandoned mine sites".

Learn more about mine sites:brainly.com/question/25875677

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13. List the following ions in order of increasing radius: Li+, Mg2+, Br"

Sergeeva-Olga [200]

Answer:

The answer would be B, PC13

Explanation:

5 0

2 years ago

Read 2 more answers

If I have one mole of sulfur, how many atoms would that be?

krok68 [10]

Answer:

Atoms of sulfur = 9.60⋅g32.06⋅g⋅mol−1×6.022×1023⋅mol−1

Explanation:

because the units all cancel out, the answer is clearly a number, ≅2×1023 as required.

7 0

3 years ago

8! How many moles are in 73410" molecules of KMO,

Cloud [144]

There’s no element with symbol M

7 0

3 years ago

Which one of the following is not a valid expression for the rate of the reaction below? 4NH3 + 7O2 → 4NO2 + 6H2O Which one of t

Veseljchak [2.6K]

Answer : All of the above are valid expressions of the reaction rate.

Explanation :

The given rate of reaction is,

$4NH_3+7O_2\rightarrow 4NO_2+6H_2O$

The expression for rate of reaction for the reactant :

$\text{Rate of disappearance of }NH_3=-\frac{1}{4}\times \frac{d[NH_3]}{dt}$

$\text{Rate of disappearance of }O_2=-\frac{1}{7}\times \frac{d[O_2]}{dt}$

The expression for rate of reaction for the product :

$\text{Rate of formation of }NO_2=+\frac{1}{4}\times \frac{d[NO_2]}{dt}$

$\text{Rate of formation of }H_2O=+\frac{1}{6}\times \frac{d[H_2O]}{dt}$

From this we conclude that, all the options are correct.

3 0

3 years ago

Round to 4 significant figures: 42,561

arsen [322]

6 is the fourth significant figures

if the number behind it is 5 or more then 5, you must add 1 to the number and ALL the number behind it will turn into 0

so that the answer is 42560

7 0

3 years ago