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CaHeK987 [17]
2 years ago
10

Which of the following is always a reactant in a combustion reaction? (5 points)

Chemistry
1 answer:
aleksandr82 [10.1K]2 years ago
4 0

Answer:

A

Explanation:

Combustion reaction always has something hydrocarbon plus oxygen gas which equals to carbon dioxide and water. Always being a reactant in a combustion reaction is oxygen, since reactants are what we start off the reaction with.

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A chemist measures the energy change ?H during the following reaction:
Leno4ka [110]

Answer:

(A) endothermic

(A) Yes, absorbed

Explanation:

Let's consider the following thermochemical equation.

2 Fe₂O₃(s) ⇒ 4 FeO(s) + O₂(g)  ΔH = 560 kJ

Since ΔH > 0, the reaction is endothermic.

We can establish the following relations:

  • 560 kJ are absorbed when 2 moles of Fe₂O₃ react.
  • The molar mass of Fe₂O₃ is 160 g/mol.

Suppose 66.6 g of Fe₂O₃ react. The heat absorbed is:

66.6g.\frac{1mol}{160g} .\frac{560kJ}{2mol} =117kJ

5 0
3 years ago
The one i selected is wrong!! pls help:(( only answer if ur right
Darina [25.2K]

Answer:

Lithium's mass number would decrease by 1

Explanation:

7 0
3 years ago
From where in the solar system did scientists conduct their spectral anaylses in 1948? How do you know?
Kryger [21]

Answer:

They conducted it from earth

Explanation:

There had never been anything capable of observing it from space launched at that time because Sputnik wasn't even launched

3 0
3 years ago
Which statement is true for one molecule of sulfur trioxide?A.(There are three atoms of sulfur and one atom of oxygen.B.(There a
ki77a [65]
The answer would be D. This is because sulfur is on it's own, meaning one. while tri is a prefix for three so there are three oxygen atoms.
5 0
3 years ago
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Which of the following best describes the role of the Supreme Court in protecting Americans' civil rights and liberties?
Citrus2011 [14]

Answer:

OB

Explanation:

 it protects civil rights and liberties by striking down laws that violate the Constitution.

8 0
3 years ago
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