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3 years ago

For question D can someone further explain please.

Chemistry

1 answer:

olasank [31]3 years ago

8 0

The far picture is unreadable. I can’t tell if it is a 50 or what.

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Suppose now that you wanted to determine the density of a small crystal to confirm that it is graphite. From the literature, you

kirza4 [7]

Answer:

The volume of first and second compound are 9.15 ml and 10.85 ml.

Explanation:

Given that,

Density of graphite = 2.25 g/cm³

Volume of mixture = 20.0 mL

Density of first compound = 1.492 g/ml

Density of second compound = 2.890 g/ml

Let the volume of first mixture = x

The volume of second mixture = (20-x)....(I)

We need to calculate the volume of first compound

Using formula of density of mixture

$\rho=\dfrac{V_{1}\rho_{1}+V_{2}\rho_{2}}{V_{1}+V_{2}}$

Where, $V_{1}$ = volume of first compound

$V_{2}$ = volume of second compound

$\rho_{1}$ =density of first compound

$\rho_{1}$ = density of first compound

Put the volume into the formula

$2.25=\dfrac{x\times1.492+(20-x)\times2.890}{x+20-x}$

$45=1.492x+57.8-2.890x$

$45-57.8=1.492x-2.890x$

$12.8=1.398x$

$x=\dfrac{12.8}{1.398}$

$x=9.15\ ml$

We need to calculate the volume of second compound

Using equation (I)

$V_{2}=20-x$

Put the value of x

$V_{2}=20-9.15$

$V_{2}=10.85\ ml$

Hence, The volume of first and second compound are 9.15 ml and 10.85 ml.

5 0

3 years ago

Answer this pls thanks

allsm [11]

Answer: It is element nitrogen. It has an atomic number of 7 and the valence electron is 5. It needs 3 electrons to complete its octet state. That's why sometimes it has the oxidation number of -3 in ammonia.

6 0

3 years ago

Read 2 more answers

How do I Unscramble this?<br><br> reusirtneadn rahi<br><br> _ _ _ _ _ _ _ _ _ _ _ _ hair

vladimir2022 [97]

The answer is unrestrained hair.

Have a nice day!

3 0

4 years ago

Read 2 more answers

1. List three factors that can cause a chemical reaction to proceed faster.

Luba_88 [7]

Explanation:

1. The three factors are;

- Increasing the surface area of the reactants

- Using a catalyst

- Increasing temperature

2. Raising the temperature of a reaction mixture is the same as increasing the kinetic energy of the reacting molecules.

3. This reaction is an exothermic reaction. In exothermic reaction, the temperature of the system (mixture) decreases while that of the surroundings increases.

4. Reactions that releases energy to the surroundings are exothermic reactions.

5. All the options is an example of exothermic process because heat is being removed from the system except;

B. Evaporation of water - This is because it must absorb heat from the surroundings making it endothermic.

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3 years ago

What are the signs of a chemical reaction?

Harlamova29_29 [7]

Bubbling And Fizzing

3 0

3 years ago