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Lemur [1.5K]
3 years ago
8

Changes in thermal energy provide evidence that a chemical reaction

Chemistry
1 answer:
nadya68 [22]3 years ago
7 0

Answer:

Exothermic reaction

Explanation:

Exothermic reaction is a reaction in which energy is evolved from the reaction to the surroundings

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identify the postulate of Dalton's theory that is violated by the following observations: 59.95% of one sample of titanium dioxi
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<u>Answer:</u> This violates the law of constant composition.

<u>Explanation:</u>

Dalton's theory is based on mainly two laws, which are law of conservation of mass and law of constant composition.

Law of constant composition states that a compound always contain the elements in the fixed ratio by their masses.

For Example: In water (H_2O), the hydrogen and oxygen are present in the fixed ratio of 1 : 9 by their mass.

We are given:

A sample of titanium dioxide having 59.95 % of titanium and another sample of titanium dioxide having 60.10 % of titanium.

As, the compound is titanium dioxide. So, the mass percent of titanium must remain the same in both the elements.

Hence, this violates the law of constant composition.

8 0
4 years ago
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maks197457 [2]

Answer:

6.4

 

Explanation:  pH

+

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−

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6.4

Explanation:

Wrote this out spaced so it's more clear.

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How many bonded pairs of electrons are there in the molecule H2CO?
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First to answer

Answer:

D: Protons that make up a nitrogen atom stays together in the nucleus

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