3 years ago

Check the box of any item below that can be categorized as matter.

Chemistry

1 answer:

Ber [7]3 years ago

8 0

Molecules of salt, atoms, chocolate cake, cells, magnets

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(03.04 MC) What is the formula for sodium nitrite? O NaN O NaN O NaNO2 O NaNO3

charle [14.2K]

Answer:

NaNO2 is the formula for sodium nitrite

Explanation:

Check the selected ions chart to find out more in depth.

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3 years ago

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alexandr402 [8]

it is water energy :) this is easy

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3 years ago

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The advantage of asexual reproduction is.

Nataly_w [17]

B. reproduction doesn’t require mate

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4 years ago

To interconvert the concentration units molality (m) and mass percent, you must also know the density of the solution. A) True B

uranmaximum [27]

Answer:

The correct answer is option false.

Explanation:

Molality of the solution defined as moles of substance present in 1 kilogram of solvent.

Moles = $\frac{Mass of solute}}{\text{molar mass of solute}}$

$Molality=\frac{Moles}{\text{Mass of solvent(kg)}}$

Mass of percent (w/w%) of the solution is defined as amount of solute present in 100 grams of solution.

$(w/w\%)_=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100$

So, if want to inter-convert molality into mass percent we can do that without knowing density of solution.

Mass of solution = Mass of solute + Mass of solvent

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3 years ago

What do you mean by atomic number?

Allushta [10]

Answer:

Atomic number is the number of protons in an isotope or element.

Explanation: The atomic number is the same number of protons in an element or isotope and if said isotope is neutral than it is the same number of electrons.

Example: Atomic number = 19 Protons = 19 if neutral Electrons = 19

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3 years ago