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3 years ago

The book will serve as a flat surface on which you

Chemistry

2 answers:

otez555 [7]3 years ago

5 0

Answer:

Explanation:

aleksklad [387]3 years ago

3 0

The book will serve as a flat surface on which you

will later place additional weights. It has its own

mass, which you need to measure.

Zero the balance. Place the book on the balance.

Measure the mass to the nearest gram (1 g).

498 g

In this experiment, you will measure all masses in

kilograms. Convert the book’s mass to kilograms.

0.498 kg

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Which of the following describes an element? Choose all that apply.

Svetradugi [14.3K]

Answer: Element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing a single proton and a single electron

Explanation:a b d

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3 years ago

Which of the following best describes your choice? It’s my best explanation for now, but I really would have to test my idea to

HACTEHA [7]

I can deduce here that the best that describes my choice is: It’s my best explanation for now, but I really would have to test my idea to be sure.

<h3>What is choice?</h3>

Choice actually refers to the act of choosing between two or more things. It has to do with going with the option, idea, decision, product or something that one prefers.

When we make choices, it depicts what we actually want. Some people still make wrong choices. The choices people make can either make or mar them in the present or future.

Looking at the given question, my choice is actually the first option.

It's clear that the idea hasn't been tested in order to be sure though it's has the best explanation.

Learn more about choice on brainly.com/question/6947486

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2 years ago

Atmospheric pressure at sea level is equal to a column of 760 mm Hg. Oxygen makes up 21 percent of the atmosphere by volume. The

Neporo4naja [7]

<u>Answer:</u> The partial pressure of oxygen is 160 mmHg

<u>Explanation:</u>

We are given:

Percent of oxygen in air = 21 %

Mole fraction of oxygen in air = $\frac{21}{100}=0.21$

To calculate the partial pressure of oxygen, we use the equation given by Raoult's law, which is:

$p_{O_2}=p_T\times \chi_{O_2}$

where,

$p_{O_2}$ = partial pressure of oxygen = ?

$p_T$ = total pressure of air = 760 mmHg

$\chi_{O_2}$ = mole fraction of oxygen = 0.21

Putting values in above equation, we get:

$p_{O_2}=760mmHg\times 0.21\\\\p_{O_2}=160mmHg$

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4 years ago

Which is the molecular shape of water, H20, according to the VSEPR theory?

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Answer:

the answer is A

Explanation:

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3 years ago

Use Lewis theory to draw the structure of the compound containing 1 carbon and 4 chlorine atoms. What would you find surrounding

Nikolay [14]

Answer : The correct option is, (B) no double bonds.

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

As we are given that the structure of the compound containing 1 carbon and 4 chlorine atoms.

Thus, the molecule is, $CCl_4$

As we know that carbon has '4' valence electrons and chlorine has '7' valence electrons.

Therefore, the total number of valence electrons in $CCl_4$ = 4 + 4(7) = 32

According to Lewis-dot structure, there are 8 number of bonding electrons and 24 number of non-bonding electrons.

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Hence, the correct option is, (B) no double bonds.

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3 years ago