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tester [92]
2 years ago
9

AL2(SO4)2.XH2O has 8.1% aluminium by mass.The value of X ?

Chemistry
1 answer:
In-s [12.5K]2 years ago
5 0

Answer:

jgutxutututrxxtdr

Explanation:

cjycitxutxtucj

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Hematite is a naturally occurring mineral and a common form of iron ore. The following statements describe physical and chemical
Oksanka [162]
<h2>Answer : Option B) The hematite particles rearrange to form a new substance.</h2><h3>Explanation :</h3>

Hematite particles when gets rearranged to form a new substance,  is an example of a chemical change.

As a chemical changes is usually a change where a substance undergoes a chemical change and forms a new substance; which cannot be easily reversed into reactants by any simple physical methods.

In this example the hematite ore forms a new substance by an irreversible chemical change.

8 0
3 years ago
Read 2 more answers
A pure gold ring weighs 23.5 grams. How many atoms of gold<br> are in the ring?
Digiron [165]

The number of atoms of gold in the pure ring are 7.18 × 10²² atoms.

<h3>HOW TO CALCULATE NUMBER OF ATOMS?</h3>

The number of atoms in a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.

The number of moles in the gold (Au) can be calculated by dividing the mass of gold by its molar mass (196.97g/mol).

no. of moles = 23.5g ÷ 196.97g/mol

no. of moles = 0.119mol

Number of atoms in Au = 0.119 × 6.02 × 10²³

no. of atoms = 7.18 × 10²² atoms.

Therefore, the number of atoms of gold in the pure ring are 7.18 × 10²² atoms.

Learn more about number of atoms at: brainly.com/question/15959704

3 0
2 years ago
As water starts to freeze, the molecules of water
amid [387]
Move more freely :) hope this helps!
8 0
3 years ago
What is the term for substances that prevent drastic changes in pH
Kay [80]

Answer:

It is termed a buffering agent

Explanation:

A buffering agent consist of a weak acid and a base that is used to maintain the acidity of a solution after the addition of

another acid or base

A buffer is used to prevent any rapid change in ph

5 0
3 years ago
Phthalic acid has a solubility of approximately 18g per 100 ml of water at 100°c and 0.62g per 100 ml of water at 25°c. what is
iogann1982 [59]

The minimum volume of water needed is 0.28 mL. The solution will have

1.7 mg of phthalic acid remaining in solution.

<em>At 100 °C</em>

Volume of water required = 50 mg HPh × (100 mL water/18 000 mg HPh)

= 0.28 mL water

<em>At 25 °C </em>

Mass of HPh in solution = 0.28 mL water × (620 mg HPh/100 mg water)

= 1.7 mg HPh

6 0
3 years ago
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