As a chemical reaction occurs, the thermometer in the container records an increase in temperature. What is true of the reaction? The reaction is endothermic because heat was taken in by the reaction.
The reaction is exothermic because heat was released by the reaction.
The reaction is endothermic because heat was released by the reaction.
The reaction is exothermic because heat was taken in by the reaction.
Answers
Answer:
The reaction is exothermic because heat was released by the reaction.
Explanation:
'exothermic' means a reaction released heat over the time of the experiment.
'endothermic' means that the reaction released cold over the experiment.
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B. The subscript 2 indicates that two atoms of oxygen are present in the substance.
C. The chemical symbol Al indicates that oxygen is present in the substance.
D. The subscript 2 indicates that two atoms of aluminum are present in the substance
Answers
Final answer:
In the formula Al2O3, the subscript 2 indicates the presence of two atoms of Aluminium, and the subscript 3 indicates the presence of three atoms of Oxygen.
Explanation:
The formula Al2O3 is for aluminium oxide. The coefficient and subscript in this formula tell us about the number of atoms of each element present in the compound. In this case:
- The chemical symbol Al indicates the presence of Aluminium.
- The subscript 2 (in Al2) indicates that there are two atoms of aluminum present in the substance.
- The chemical symbol O indicates the presence of Oxygen.
- The subscript 3 (in O3) indicates there are three atoms of oxygen present in the substance.
So, the correct answer to the question is, the subscript 2 indicates that two atoms of aluminum are present in the substance (option D).
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Answers
Yes. The NaCl will precipitate.
Yes. The BaSO4 will precipitate.
Yes. Both the NaCl and the BaSO4 will precipitate.
Answers
Yes. The BaSO₄ will precipitate in this type of double replacement reaction.
What is Double replacement reaction?
This is a type of reaction in which two reactants exchange ions to form two new compounds.
Na₂SO₄ (aq) + BaCl₂ (aq) ⇒ NaCl(aq)+ BaSO₄(s)
The precipitate which will be seen at the bottom of the reaction flask is solid BaSO₄.
Read more about Double replacement reaction here brainly.com/question/5082638
Answer: The correct answer is Yes, will precipitate.
Explanation:
Double displacement reaction is defined as the reaction in which exchange of ions takes place.
Precipitate is defined as the insoluble salt which emerges when two different solutions are mixed together. It settles down at the bottom of the flask after some time.
The chemical equation for the reaction of sodium sulfate and barium chloride follows:
Barium sulfate settles down in the reaction flask and is considered as a precipitate.
Hence, the correct answer is Yes, will precipitate.
Answers
Answers
Kb = [pOH⁺][OH⁻] / [ pH] = 1.7×10⁻⁹
Let x mol dissociate:
[pOH⁺] = [OH⁻] = x [pH] = 0.032 - x ≈ 0.032
[x] [x] / [0.032] = 1.7×10⁻⁹
x₂ = 0.032 * 1.7 x 10⁻⁹
x = 5.44 x 10⁻¹¹ = [OH⁻]
pOH = -log [OH⁻] = -log[ 5.44 x 10⁻¹¹] = 10.26
pH = 14.00 - pOH
pH = 14.00 - 10.26
PH = 3.74
hope this helps!
(2) decomposition
(3) Single replacement(4) double replacement
Answers
Answer:
A.) synthesis
Explanation:
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