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wariber [46]
2 years ago
7

Identify a human activity that impacts the land negatively then describe a positive action that can help rude effects caused by

the activity
giving brainiest
Chemistry
1 answer:
Lostsunrise [7]2 years ago
5 0
The number of trips one takes in a car should be reduced.

reduce or eliminate fireplace and wood stove use.

burning leaves, trash, and other materials should be avoided.

using gas-powered lawn and garden equipment should be also be avoided.
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What is the ratio of Al 3+ ions to S 2- ions in a neutral compound?
iren2701 [21]
In a neutral ionic compound, you can determine its sub-scripts by simply flipping the ionic charges and dropping the signs: so AlS would be Al2S3
4 0
3 years ago
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Select all steps below that you followed to practice laboratory safety during the experiment. used tongs or a test tube holder t
uysha [10]

Explanation:

Steps followed to practice laboratory safety during the experiment are as follows.

  • Used tongs or a test tube holder to hold materials over the Bunsen burner flame.
  • Wore gloves and goggles.
  • Made careful observations of the products and reactants.
  • Did not smell the gases produced.

When we heat a test tube over bunsen flame then the tube gets hot and when we hold it with bare hands then out hands will burn. Therefore, it is advised to hold test tube with the help of tongs or a holder so that our hands did not burn.

We should also wear gloves and goggles so that any acid would not spill directly on our hands, skin and eyes as it can affect or damage the skin severely.

Careful observations were made so that correct calculations about the experiment can be carried out.

It is also advised that we should not smell the gases produced but gases move freely from one place to another in a laboratory or any where else.

So, we can try to avoid it by covering our mouth with a cloth but we cannot stop it. If we keep on inhaling the gases produced in a laboratory then it can also lead to severe disease or defect in the human body.

8 0
3 years ago
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Help Me plz I'm so tired
zvonat [6]
The answer is D :) have a nice day!
3 0
2 years ago
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How many molecules are in 12.5g of water<br> (H2O)?<br> Molar mass <br> Help asap
ira [324]

Answer:

Explanation:

18.01528 g/mol. I googled this, but it would be 16 for O plus 2 for the 2 H's. 18 g/mol divided by 12.5g=1.44 mol of H20.

1.44mol*6.02*10x^{23} molecules/mol= 8.6688*10^23.

7 0
3 years ago
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Given that H2(g) + F2(g) - &gt; 2HF(g) delta H rxn = -546.6 kJ 2H2(g)+ O2(g) - &gt; 2H2O(l) delta H rxn = 571.6 kJ
olasank [31]

Answer:

ΔHrxn = -521.6 kJ

Explanation:

To do this, let's write the equations by separate:

H₂ + F₂ -------> 2HF        ΔH = -546.6 kJ

2H₂ + O₂ -------> 2H₂O   ΔH = -571.6 kJ

For these reactions, we want to get the following reaction:

2F₂ + 2H₂O -------> 4HF + O₂     ΔHrxn = ?

To do this, all we have to do is take the first two reaction and put them in the way to obtain the third reaction. When we look the final reaction we can see that the water is on the reactants, when originally it was on the product, while Florine is doubled. So all we have to do is rewrite the first two reactions, duplicate the first reaction, and reverse the second reaction, and that way we will get the final reaction:

1) (H₂ + F₂ -------> 2HF ) x2      ΔH = -546.6 kJ x 2

2) (2H₂O --------> 2H₂ + O₂)   ΔH = -571.6 kJ x -1

---------------------------------------------------------------------------

1) 2H₂ +2F₂ -------> 4HF      ΔH = -1093.2 kJ

2) 2H₂O --------> 2H₂ + O₂   ΔH = +571.6 kJ      

Now we sum 1) and 2). In this way, hydrogen cancels out and we do the same with the enthalpy:

1) 2H₂ +2F₂ -------> 4HF      ΔH = -1093.2 kJ

2) 2H₂O --------> 2H₂ + O₂   ΔH = +571.6 kJ  

---------------------------------------------------------------

2F₂ + 2H₂O -------> 4HF + O₂     ΔHrxn = -1093.2 + 571.6 = -521.6 kJ

So the enthalpy of this reaction is

<em>ΔHrxn = -521.6 kJ</em>

3 0
3 years ago
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