3 years ago

Explain the difference in appearance between a pure substance and a mixture

1 answer:

6 0

1) Mix can be divided on components using physical methods like filtration, of evaporation, or distillation and so on. But substance cannot.
2) Substance contains only one kind of the molecules (particles) , but mix can contain several kinds of molecules.

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Empirical formula for compound of 2.17 mol N and 4.35 mol O

balu736 [363]

Answer:

Explanation:

ratio of moles of N and O in molecule =

N / O = 2.17 / 4.35

1/2

empirical formula = NO₂

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3 years ago

A dry soil sample has a volume of 500 mL. After 400 mL of water are added to the soil, the soil becomes saturated with 150 mL of

Lerok [7]

The Answer is 50. hope this helps

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Name an element that has the same number of electron energy levels as Calcium (Ca)?

Lerok [7]

Answer:

aluminum?

Explanation:

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3 years ago

Which option explains how purple pigments make some flower petals purple?

raketka [301]

Many of the actual chemicals in flower petals that give them their different colors are called anthocyanins. These are water-soluble compounds that belong to a bigger class of chemicals known as flavonoids. Anthocyanins are responsible for creating the colors blue, red, pink, and purple in flowers.

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3 years ago

A silver necklace has a density of 10.5 g/mL and a volume of 1.5 mL. What is the mass of the silver necklace?

melamori03 [73]

Answer:

15.75g

Explanation:

Rearrange the formula: density = mass/volume, so that mass is the subject: mass = density × volume

Now substitute (plug in) the known values into the formula:

mass = 10.5 × 1.5 ⇒ mass = 15.75g

The mass of the silver necklace is 15.75g

Hope this helps!

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3 years ago