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3 years ago

What property can be used to separate oil from milk?

Chemistry

1 answer:

Usimov [2.4K]3 years ago

3 0

Answer:

Density oil will float

Explanation:

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40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been ad

kirill115 [55]

Answer:

0.5 M

Explanation:

We have to start with the reaction between NaOH and CH3COOH:

$CH_3COOH~+~NaOH->CH_3COONa~+~H_2O$

We will have a 1:1 ratio between the acid and the base. The next step then would be the calculation of the moles of NaOH and his convertion to moles of CH3COOH.

$20~mL~\frac{1~L}{1000~mL} ~=~0.02~L$

$mol~=~0.1~M*0.02~L=0.02~mol~NaOH$

$0.02~mol~NaOH~\frac{1~mol~CH_3COOH}{1~mol~NaOH}=~0.02~mol~CH_3COOH$

The final step is the calculation of the concentration of the acid.

$M=\frac{0.02~mol~CH_3COOH}{0.04~L}=~0.5~M$

Due to the Ka value we can use the acetic acid as a strong acid.

6 0

3 years ago

If you mix different amounts of two ideal gases that are originally at different temperatures, what must be true of the final st

faltersainse [42]

Answer:

a,c are correct

Explanation:

a) On mixing two gases the final temperature of both the gases becomes the same. The heat will flow from high temp. gas to lower temp gas till the temp of both gases become equal (Thermal equilibrium). This is correct.

b) The rms speed of the molecule is inversely proportional to its molar mass so the final rsm will not be the same. This is incorrect.

c) The average kinetic energy of the system will remain the same. Hence this is also correct.

5 0

3 years ago

What type of bond is sand

deff fn [24]

Answer:

Hello there! How are you doing today :] Sand would be a covalent bond.

Explanation:

Silica is one of the main compounds found in sand. It also contains many silicon and oxygen atoms. which; are joined together by covalent bonds in a regular arrangement, forming a giant covalent structure.

7 0

3 years ago

How can chemical changes be detected

saul85 [17]

Rarely they can't with just sight. Certain tests or experiments should take place

7 0

3 years ago

A sample of an unknown metal has a mass of 120.4 g. As the sample cools from 90.5°C to 25.7°C, it releases 7020 J of energy. Usi

Dafna1 [17]

Answer:

Explanation:

sheesh i wouldn’t know

6 0

3 years ago