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vichka [17]
3 years ago
7

In which scenario is a chemical change occurring?

Chemistry
2 answers:
fenix001 [56]3 years ago
4 0

the answer is A because had this question before

Dimas [21]3 years ago
4 0
Answer is C because each of the above cause a change in state, hence it’s physical, the molecules remain same.
But corrosion is a chemical change, cause there is an addition of water and air to the regular iron molecules
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Heather mixes two white liquids together. Immediately, a gray liquid forms.
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The grey liquid is related to the white liquids because the change in colour is the result of a chemical change/reaction between the two white liquids.
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3 years ago
Classify this chemical reaction:<br><br> 2 HNO3 (aq) + Sr(OH)2 (aq) → Sr(NO3)2 (aq) +2 H2O (l)
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Answer:

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7 0
3 years ago
Limiting Reactants—————-
denis-greek [22]

Answer:

21.8 grams.

Explanation:

Molar mass data from a modern periodic table:

  • Mg: 24.301;
  • O: 15.999.

How many moles of MgO will be produced if Mg is the limiting reactant?

Number of moles of Mg:

\displaystyle n = \frac{m}{M} = \frac{16.3}{24.301} = 0.670644\;\text{mol}.

The ratio between the coefficient of Mg and that of MgO is 2:2. Two moles of Mg will make two moles of MgO. 0.670644 moles of MgO will be produced if Mg is the limiting reactant.

How many moles of MgO will be produced if O₂ is the limiting reactant?

Number of moles of O₂:

\displaystyle n = \frac{m}{M} = \frac{4.33}{15.999} = 0.270642\;\text{mol}.

The ratio between the coefficient of O₂ and that of MgO is 1:2. One mole of O₂ will make two moles of MgO. 2\times 0.270642 = 0.541284\;\text{mol} of MgO will be produced if O₂ is in excess.

How many moles of MgO will be produced?

0.541284 is smaller than 0.670644. Only 0.541284 moles of MgO will be produced since O₂ will run out before all 16.3 grams of Mg is consumed.

What's the mass of 0.541284 moles of MgO?

Formula mass of MgO:

24.301 + 15.999 = 40.300\;\text{g}\cdot\text{mol}^{-1}.

Mass of 0.541284 moles of MgO:

m = n \cdot M = 0.541284\times 40.300 = 21.8\;\text{g}.

7 0
3 years ago
Complete the following chart to fill in the blanks
raketka [301]
Im so sorry i don’t know I just need to answer 2 questions for me to be Able to ask
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The magnetic field of an object exerts a force on any magnetic object around it.
11111nata11111 [884]

Answer: True

Explanation: this is true

8 0
3 years ago
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