3 years ago

Choose the false statement regarding resistance

Chemistry

1 answer:

Dmitry_Shevchenko [17]3 years ago

4 0

I would say all if no statements are available

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Which substance is a mixtureWhich pure substance can be classified as an element

lubasha [3.4K]

Answer:

pure substance : lead ( Pb )

mixture substance : nitrogen ( N )

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3 years ago

An alloy contains 57 g of silver and 20g of copper what is the percentage silver in the alloy

Allushta [10]

Total weight of alloy is
67 + 20 = 87 g
67 g of which is gold
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4 years ago

How many molecules of CH4 are in 24.1 g of this compound?

jok3333 [9.3K]

1) find molar mass of CH₄

$=12.01+4(1.01)\\\\=16.05\ g/mol$

2) determine moles of CH₄

$=24.1g\ CH_{4}\ x\ \frac{1\ mol\ CH_{4}}{16.05g\ CH_{4}}\\\\=1.501557632\ mol\ CH_{4}$

3) multiply by avogadro's number

$=1.501557632\ mol\ CH_{4}\ x\ \frac{6.022\ x\ 10^{23}\ molecules\ CH_{4}}{1\ mol\ CH_{4}} \\\\=9.04238006\ x\ 10^{23}\\\\=9.04\ x\ 10^{23}\ molecules\ CH_{4}$

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2 years ago

Say the first thing that comes to your mind to get some free points.

musickatia [10]

Answer:

The first thing that comes to my mind the moment I get up is when will I finish all my works and how will I pass 10th.

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3 years ago

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A loaf of bread has a volume of 700 cm3 and a mass of 420 g. what is the density of the bread?

joja [24]

We know that the equation for density is:

$D=\frac{m}{V}$

where D is the density, m is the mass in g, and V is the volume in either mL or cubic centimeters.

So then, given two of the variables, we can solve for density:

$D=\frac{420g}{700cm^{3}}$

$D=\frac{0.6g}{cm^{3}}$

Therefore, the density of the bread is 0.6g per cubic centimeter.

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4 years ago