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2 years ago

How is the periodic table of the elements arranged?

Chemistry

2 answers:

Bogdan [553]2 years ago

6 0

Answer:

Answer is B

Explanation:

i just took the test

vagabundo [1.1K]2 years ago

3 0

Answer:

B. By aligning groups with common properties.

Explanation:

The periodic table is a table of elements arranged into rows called periods and columns called groups.
Elements with similar chemical properties are placed in the same group. For example, group 1 elements known as alkali metals share similar properties.
Elements in the same period or low have the same number of energy shells or energy levels. For example elements in period 3 have 3 energy levels.

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Balance the following chemical equation <br> __Mg+__O2–>__MgO

mario62 [17]

Answer:

2Mg^+ +O2 right arrow 2MgO

Explanation:

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3 years ago

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describe in general terms an experiment to determine the molal freezing point depression constant kf of water. Assume the availa

Dvinal [7]

A solution (in this experiment solution of NaNO₃) freezes at a lower temperature than does the pure solvent (deionized water). The higher the solute concentration (sodium nitrate), freezing point depression of the solution will be greater.
Equation describing the change in freezing point:
ΔT = Kf · b · i.
ΔT - temperature change from pure solvent to solution.
Kf - the molal freezing point depression constant.
b - molality (moles of solute per kilogram of solvent).
i - Van’t Hoff Factor.
First measure freezing point of pure solvent (deionized water). Than make solutions of NaNO₃ with different molality and measure separately their freezing points. Use equation to calculate Kf.

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3 years ago

I NEED HELP PLEASE, THANKS! :)

marin [14]

Answer:

$\large \boxed{1.447 \times 10^{23}\text{ molecules Cu(OH)}_{2 }}$

Explanation:

1. Calculate the moles of copper(II) hydroxide

$\text{Moles of Cu(OH)}_{2} = \text{23.45 g Cu(OH)}_{2} \times \dfrac{\text{1 mol Cu(OH)}_{2}}{\text{97.562 g Cu(OH)}_{2}} = \\\\\text{0.240 36 mol Cu(OH)}_{2}$

2. Calculate the molecules of copper(II) hydroxide

$\text{No. of molecules} = \text{0.240 36 mol Cu(OH)}_{2} \times \dfrac{6.022 \times 10^{23}\text{ molecules Cu(OH)}_{2}}{\text{1 mol Cu(OH)}_{2}}\\\\= 1.447 \times 10^{23}\text{ molecules Cu(OH)}_{2}\\\text{The sample contains $\large \boxed{\mathbf{1.447 \times 10^{23}}\textbf{ molecules Cu(OH)}_{\mathbf{2}}}$}$

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3 years ago

PPLEASE HELP I WILL GIVE BRAINLIEST AND LOT OF POINTS

marysya [2.9K]

Answer:

Hi, even though this is really not a question or an answer to a question.

Explanation:

Do you know if any of this stuff involves 6th grade?

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3 years ago

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How does inheritance depend on genes?

zaharov [31]

Answer:

Parents pass on traits or characteristics, such as eye colour and blood type, to their children through their genes.These two copies of the gene contained in your chromosomes influence the way your cells work. The two alleles in a gene pair are inherited, one from each parent.

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2 years ago