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AveGali [126]
3 years ago
5

Select all the correct answers.

Chemistry
2 answers:
swat323 years ago
8 0

Silver tarnishes and becomes black when exposed to oxygen:

              Diesel fuel burns when it is heated:

Mashutka [201]3 years ago
7 0

Answer:

              Silver tarnishes and becomes black when exposed to oxygen:

              Diesel fuel burns when it is heated:

Explanation:

                    Chemical Changes are those changes in which the chemistry at molecular level is changed as the starting material is converted in to a new and different final material. This change takes place with the breaking of old bonds and forming of new bonds respectively.

Silver tarnishes and becomes black when exposed to oxygen:

This is a chemical change as Silver a white and lustrous starting material is being converted into a tarnish black final material. However, Silver doesn't readily react with oxygen at normal conditions. It readily react with Sulfur containing compounds in air and produces black compound as Ag₂S.

Diesel fuel burns when it is heated:

Diesel is a mixture of hydrocarbons ranging approximately from C₁₀H₂₀ to C₁₅H₂₈. When these hydrocarbons are burnt they produces a new materials i.e. CO₂ and H₂O.

                             C₁₀H₂₀  +  15 O₂    →     10 CO₂  + 10 H₂O

Hence, it is also a chemical reaction.

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This type of mutation occurs when one or more base pairs are removed from the gene sequence.
Aleks [24]

Answer:

Frameshift mutation

Explanation:

4 0
3 years ago
Methane (CH4), is said to be the cleanest burning fossil fuel. When burned, it releases carbon dioxide gas and forms water. Usin
LiRa [457]

From the stoichiometry of the balanced reaction equation, the correct statement are;

  • For every 1 molecule of methane CH4 that reacts, 2 molecules of H2O are produced.
  • For every 20 grams of methane (CH4) that reacts, 40 grams of H2O are produced.
  • For every 200 moles of methane (CH4) that reacts, 400 moles of H2O are produced.

<h3>What is combustion?</h3>

The term combustion refers to the burning of fossil fuels for the purpose of energy production. The equation for reaction is CH4 + 2O2 ---> CO2 + 2H2O.

Using this equation as shown, the true statements are;

  • For every 1 molecule of methane CH4 that reacts, 2 molecules of H2O are produced.
  • For every 20 grams of methane (CH4) that reacts, 40 grams of H2O are produced.
  • For every 200 moles of methane (CH4) that reacts, 400 moles of H2O are produced.

Learn more about combustion: brainly.com/question/15117038

3 0
2 years ago
Element J is 1s 2s 2p 3s . (i) How many unpaired electrons does J have?
Mama L [17]

Answer:6

Explanation:

3+3

7 0
3 years ago
Pls i need help with this
gregori [183]

Answer:

C

Explanation:

A physical change is one in which no new substance is formed. The moistening of food by saliva is purely a physical change because no new substance is formed in the process.

A chemical change leads to the formation of a new substance. The action of the enzyme converts starch into sugar which means that a new substance is formed. This is a chemical change.

5 0
3 years ago
When hydrogen is burned in the presence of oxygen it will form water, as per the equation: 2H2 + O2 -&gt; 2H2O. Which types of r
nadya68 [22]

Answer:

B

Explanation:

Hydrogen is synthesized to water by adding Oxygen.

Hydrogen is oxidised to water by combustion ( burning in presence of oxygen).

4 0
3 years ago
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