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Vadim26 [7]
3 years ago
10

What tools would you use to measure the density of a rectangular block?

Chemistry
1 answer:
dimulka [17.4K]3 years ago
3 0
A scale and a ruler. The scale to measure the mass, and a ruler to measure the volume.
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A closed container is filled with oxygen. The pressure in the container is 245 kPa . What is the pressure in millimeters of merc
Zanzabum

Answer:

1837.65 mmHg is the pressure in millimeters of mercury.

Explanation:

The expression for the conversion of Pressure (kPa)  to pressure (mmHg) is shown below as:-

Pressure (kPa) = 7.501 x Pressure (mmHg)

The pressure value given =  245 kPa

It can be expressed in millimeters of mercury as:-

Pressure = 7.501 x 245 mmHg = 1837.65 mmHg

<u>1837.65 mmHg is the pressure in millimeters of mercury.</u>

7 0
4 years ago
Find the number of moles of water that can be formed if you have 182 mol of hydrogen gas and 86 mol of oxygen gas.
frutty [35]
Water has a chemical formula of H2O. This means that for every 2 moles of hydrogen and 1 mole of oxygen, one mole of water will be formed.

Note that hydrogen gas and oxygen gas are both biatomic molecules. 

 (1)                   (182 mol H2) x (1 mol H2O/ 1 mol H2) = 182 mol H2O
 (2)                   (86 mol O2) x (2 mol H2O / 1 mol O2) = 172 mol H2O

We choose the smaller number of the two as the answer to this item. Thus, the answer to this question is 172 mol of H2O can be formed out of the given quantities. 
3 0
3 years ago
Avogadros number is used to determine the number of subatomic particles in an atom. True or false
Yuliya22 [10]

Answer:

False

Explanation:

The Avogadro's number is not used to determine the number of subatomic particles in an atom.

Subatomic particles of an atom are the protons, neutrons and electrons.

The protons are the positively charged particles in an atom

Neutrons do not carry any charges

Electrons carry negative charges.

 The number of protons, neutrons and electrons in an atom are experimentally determine using spectrometric techniques.

7 0
3 years ago
The following reaction shows the products when sulfuric acid and aluminum hydroxide react.
scoray [572]

Leftover: approximately 11.73 g of sulfuric acid.

<h3>Explanation</h3>

Which reactant is <em>in excess</em>?

The theoretical yield of water from Al(OH)₃ is lower than that from H₂SO₄. As a  result,

  • Al(OH)₃ is the limiting reactant.
  • H₂SO₄ is in excess.

How many <em>moles</em> of H₂SO₄ is consumed?

Balanced equation:

2 Al(OH)₃ + 3 H₂SO₄ → Al₂(SO₄)₃ + 6 H₂O

Each mole of Al(OH)₃ corresponds to 3/2 moles of H₂SO4. The formula mass of Al(OH)₃ is 78.003 g/mol. There are 15 / 78.003 = 0.19230 moles of Al(OH)₃ in the five grams of Al(OH)₃ available. Al(OH)₃ is in excess, meaning that all 0.19230 moles will be consumed. Accordingly, 0.19230 × 3/2 = 0.28845 moles of H₂SO₄ will be consumed.

How many <em>grams</em> of H₂SO₄ is consumed?

The molar mass of H₂SO₄ is 98.076 g.mol. The mass of 0.28845 moles of H₂SO₄ is 0.28845 × 98.076 = 28.289 g.

How many <em>grams</em> of H₂SO₄ is in excess?

40 grams of sulfuric acid H₂SO₄ is available. 28.289 grams is consumed. The remaining 40 - 28.289 = 11.711 g is in excess. That's closest to the first option: 11.73 g of sulfuric acid.

6 0
3 years ago
While setting up a beaker to boil a solution on a hot plate, you notice that the stirring is erratic and unstable. What should y
Mama L [17]

Given what we know about lab safety, we can confirm that when dealing with unstable and erratic equipment such as the stirring mechanism, in this case, the best course of action is to deactivate the equipment until further notice.

<h3>Why should we turn off the equipment?</h3>
  • The erratic nature of the stirring mechanism is making the entire system unstable.
  • When dealing with a hot plate, and heating substances, we need to maintain stability at all times.
  • We do this to avoid spills that may cause burns or other unwanted damages.
  • Therefore, until we know why the stirring was erratic, we must turn the mechanism off.

Therefore, we can confirm that when dealing with faulty or unstable lab equipment, we must deactivate the equipment immediately in order to preserve our lab safety.

To learn more about lab safety visit:

brainly.com/question/20103808?referrer=searchResults

3 0
3 years ago
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