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3 years ago

What important points do you need to remember about combustion?

Chemistry

1 answer:

goldenfox [79]3 years ago

7 0

Explanation:

A substance burning in the presence of oxygen and leads to the formation of heat and light is called combustion.

Some important points about combustion are as follows:

Fuel should be present for burning.
Air should be present for the supply of oxygen.
There should be heat (or ignition temperature) to initiate the chemical reaction.

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Acid + base —> salt + water What type of reaction is this?

erastova [34]

$\sf{Acid}+\bf{Base}\longrightarrow \tt{Salt}+\bold{Water }$

These type of reaction is called as Neutralization Reaction.

8 0

3 years ago

Compare land cover and land use, explaining how they are related and describing one way that humans can affect that relationship

Natali5045456 [20]

Answer:

Land covers refer to all the manufactured structures and vegetation that covers the land it includes all vegetation including plants, shrubs, trees, and other man-made structures too.

On other hand, Land use is the term that explains the use of the land by the different human activities that are occurred on land that are directly related to the land.

Land cover influences land use by utilizing particular land such as parks, ponds, or other uses according to the land. and humans can cause changes in both when they urbanize the area or land.

5 0

3 years ago

A reading shows a pressure measurement of 43 in. Hg. What is the equivalent pressure in psi? A. 5.73 psi B. 2223.13 psi C. 26.32

oksian1 [2.3K]

43 inHg = 43 inHg*2.54cm/in = 109.22cmHg * 10 mm/cm = 1092.2 mmHg

14.7 psi = 760 mmHg

1092.2mmHg * 14.7psi / 760 mmHg = 21.13 psi

Answer: option D. 21.13 psi

7 0

4 years ago

Read 2 more answers

In your own words how do plants on Earth affect the amount of carbon in Earth’s atmosphere?

Bumek [7]

Answer:

Plants take carbon dioxide out of the atmosphere, but they also have other effects, such as changing the amount of evaporation from the land surface. ... The plants absorb carbon dioxide for photosynthesis through the same pores (called stomata). But when carbon dioxide levels are high, the leaf pores shrink.

Explanation:

5 0

3 years ago

Read 2 more answers

if 10 ml of acetone (60) is diluted with water to a total solution volume of 200 ml, what is the percent by volume of acetone in

sergey [27]

Answer:

Explanation:

Given parameters:

Volume of original acetone before dilution = 10ml

Volume of diluted solution = 200ml

Unknown:

Percent volume of acetone in the solution = ?

Solution:

To find the percent volume of acetone in the diluted solution, use the expression below;

Percent volume of acetone = $\frac{volume of original acetone}{diluted volume} x 100$

Insert the parameters and solve;

Percent volume of acetone = $\frac{10}{200}$ x 100 = 5%

6 0

3 years ago