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4 years ago

Quiz

Chemistry

2 answers:

olga2289 [7]4 years ago

8 0

What does matter mean?

Object which has mass and occupies space

What does atom mean?

The smallest particle of a chemical element which is made mainly by 3 sub-atomic particles called Protons,Electrons and Neutrons.

What does molecule mean?

A small group of atoms bonded together.

RUDIKE [14]4 years ago

8 0

someone answerd before me so me want point and thank u for points U_U

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How many moles of Ar gas are present in a container with a volume of 78.4 L at STP?

rusak2 [61]

<h3>Answer:</h3>

1 mole of a gas at STP occupies 22.4 L volume 

Now the volume is given =78.4 therefore,

No. of moles of gas = 78.4 ÷ 22.4 = 3.5 moles

I hope it helps you~

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2 years ago

Which of the following may indicate that a chemical reaction has occurred?

lianna [129]

Answer:

D, all of the above

Explanation:

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3 years ago

If you have a negative ion, what happened to the outer shell of the atom?

Nastasia [14]

It will lose them and become stable

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3 years ago

What is the molarity of H3PO4?

masya89 [10]

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3 years ago

How many atoms are in 578g Na

borishaifa [10]

1.51 x 10²⁵atoms

Explanation:

Given parameters:

Mass of Na = 578g

Unknown:

Number of atoms = ?

Solution:

To find the number of atoms, we must first find the number of moles the given mass contains.

Number of moles = $\frac{mass}{molar mass}$

molar mass of Na = 23g

Number of moles = $\frac{578}{23}$ = 25.13moles

1 mole of a substance = 6.02 x 10²³atoms

25.13 mole of Na = 25.13 x 6.02 x 10²³atoms

This gives 1.51 x 10²⁵atoms of Na

Learn more:

Avogadro's constant brainly.com/question/2746374

#learnwithBrainly

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4 years ago