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3 years ago

Is pencil lead a heterogeneous or homogeneous mixture?

1 answer:

7 0

Is a pencil a mixture?

Yes, A pencil is a mixture because it can be separated. A mixture is a mix of substances that can be unmixed - like some cereal, the actual cereal can be taken out of the mix to become independent.
It's heterogeneous

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Which of these compounds hast the highest melting point CCl4 CBr4 CH4 CF4 CI4

ikadub [295]

The compound CBr4 has the highest melting point of 91°C

4 0

4 years ago

How many molecules of ethane ( C2H6) are present in 0.197g of C2H6?

Brut [27]

Answer:

3.945 x 10²¹ molecules

Explanation:

Firstly, we need to calculate the no. of moles using the relation:

n = mass/molar mass = (0.197 g)/(30.07 g/mol) = 6.55 x 10⁻³ mol.

It is known that every 1.0 mol of a molecule contains Avogadro's number of molecules (NA = 6.022 x 10²³).

∴ 0.197 g of C₂H₆ will contain = (6.55 x 10⁻³ mol)(6.022 x 10²³) = 3.945 x 10²¹ molecules.

4 0

3 years ago

Read 2 more answers

How many moles are in 7.2 x 10^23 carbon molecules?

choli [55]

Explanation:

It is known that in 1 mole there are $6.023 \times 10^{23}$ atoms or molecules.

It is given that there are $7.2 \times 10^{23}$ carbon molecules. Therefore, calculate the moles as follows.

Number of moles = $\frac{7.2 \times 10^{23} molecules}{6.023 \times 10^{23} molecules/mol}$

= 1.196 mol

Thus, we can conclude that there are 1.196 mol in $7.2 \times 10^{23}$ carbon molecules.

7 0

3 years ago

Convert 15,000 seconds into minutes

Vlad [161]

Answer:

250 minutes

Explanation:

60 seconds = 1 minute

15000 secods = 15000 / 60

1500 secons = 250 minutes

7 0

3 years ago

Hello, please help tysmmmm!!

Fed [463]

Answer:

2.07

Explanation:

1870=(20.01)(c)(45.2)

1870 = 904.452c

c = 2.07 J/g C (to 3 sf]

3 0

2 years ago