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3 years ago

Which type of substance can be separated using a centrifuge?

Chemistry

2 answers:

Vaselesa [24]3 years ago

4 0

C is the best answer

Semenov [28]3 years ago

4 0

I took a test with this on it and C is the right answer. I'm answering this so the other person who answered this can get brainliest.

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9- Which pair of formulae represents two alkanes? (1 mark)

Ksenya-84 [330]

Answer:

A) CH4 and C8H18

Explanation:

General Formula for an Alkane = CnH2n+2

This means for every number of Carbon (C) atoms, there are twice as many Hydrogen (H) atoms with an additional two added onto that.

Therefore, if there is one Carbon Atom, and we multiply that by two, and then add an additional two, we get 4 Hydrogen atoms, so CH4, which is our first Formulae

Secondly, if we have eight Carbon Atoms, and we multiple that by two (16), and then add an additional two, we get 18 Hydrogen atoms, so C8H18, which is our second Formulae

The other Formulas do not follow this 'General Formula'

8 0

2 years ago

Why do you think plant cells need a cell wall as well as a cell membrane?

Sergio039 [100]

Answer:

to protect it from harm

Explanation:

3 0

3 years ago

A note about crystallization or its definition?

Mashutka [201]

Crystallization is: A chemical of solid - liquid separation technique, in which mass transfers a solute from the liquid solution to a pure solid crystalline phase occurs. In chemical engineering crystallization occurs in a crystallizer.

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4 0

3 years ago

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The area of a telescope lens is 7903 rnrn2 {a) What is the area in square feet (ft2)? (b) If it takes a technician 45 s to polis

LekaFEV [45]

Answer:

Area is 0.08504 $ft^{2}$ and $2.6\times 10^{3}s$ are needed for polishing

Explanation:

(a) ft is unit of F.P.S system whether mm is unit of M.K.S system.

According to unit conversion, $1mm=0.00328ft$

So, $1mm^{2}=(0.00328)^{2}ft^{2}=1.076\times 10^{-5}ft^{2}$

hence, $7903mm^{2}=7903\times 1.076\times 10^{-5}ft^{2}=0.08504ft^{2}$

So, area of telescope lens is 0.08504 $ft^{2}$

(b) $135mm^{2}$ are polished in 45s

So, $7903mm^{2}$ are polished in $\frac{45\times 7903}{135}s$ or $2.6\times 10^{3}s$

5 0

3 years ago

Stomach acid has a pH of about 2. What conclusion can you reach about the pH of an antacid solution that is used to neutralize e

ehidna [41]

Explanation:

When a substance or solution has pH equal to 7 then it is known as a neutral solution. And a solution with pH more than 7 is basic in nature.

Antacid is a base that has chemical formula $Mg(OH)_{2}$ and it is also known as magnesium hydroxide.

Hence, an antacid has pH greater than 7 (making it basic) so that it can neutralize the acid.

Therefore, when excess of acid is formed in the stomach then there occurs more hydrogen ions. Due to which pain is felt in the stomach and in this situation when an antacid is consumed then it releases hydroxide ions as it is a base due to which acid gets neutralized and we feel relieved.

Hence, we can conclude that the pH of an antacid solution that is used to neutralize excess stomach acid is more than 7.

7 0

3 years ago

Read 2 more answers