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3 years ago

A(n) _____ refers to two or more atoms held together by covalent bonds.

Chemistry

1 answer:

arlik [135]3 years ago

7 0

Answer: Option (d) is the correct answer.

Explanation:

A covalent bond is defined as the bond formed by sharing of electrons between the two chemically combining atoms.

For example, atomic number of chlorine is 17 and it has 7 valence electrons.

To attain stability it need to gain one more electron.

So, when one chlorine atom chemically combines with another chlorine atom then there occurs sharing of electrons between the two. As a result, there will be sharing of electrons.

A molecule is defined as the specie that contains same type of atoms which are chemically combined together in a fixed ratio by mass.

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How fast do you think the air particles in this room are moving compared to a car going 50 mph (about 22m/s)? Put your answer is

Minchanka [31]

The average molecule of air is moving at speed of 500 m /s and thus

speed of air particle = 500 m /s

speed of car = 22 m /s

Whereas, the speed of molecule /speed of car = 500 /22 = 22.72

Thus, molecule travel at 22.72 times faster than speed of car.

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4 years ago

The reaction 2Fe + 3Br2 ———> 2FeBr3 is an example of which type of reaction

azamat

Answer: combination reaction

Explanation: combination or synthesis reaction where A +B will form AB

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3 years ago

You crumple a piece of paper in your hands. Not all of the kinetic energy from your hands is used to crumple the paper. Where do

Shkiper50 [21]

Answer:

Explanation:

When you crumble a piece of paper it make a sound plus i just did on apex

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3 years ago

If O2 molecule is saturated with outer electrons how can it gain electrons to form ions?

PIT_PIT [208]

Answer: it will gain them by multiplying the electrons

Explanation:

its like 2 + 2=4

4+4=8

8 0

2 years ago

Explain how you would make 450 mL of a .250M NaOH solution?

Neporo4naja [7]

Answer:

Weigh 4.5 grams of sodium hydroxide and add it to the dry volumetric flask of 450 mL followed by small amount of water to dissolve all the NaOH .After this add the water upto tye mark of 450 mL.

Explanation:

Molarity of the solution is the moles of compound in 1 Liter solutions.

$Molarity=\frac{\text{Mass of compound}}{\text{Molar mas of compound}\times Volume (L)}$

Mass of NaOH = x

Molar mass of NaOH = 40 g/mol

Volume of the NaOH solution = 450 mL =- 0.450 L ( 1 ml = 0.450 L)

Molarity of the solution of NaOH = 0.250 M

$Molarity=\frac{1.248 g}{26 g/mol\times 0.9102254 L}=0.528 mol/L$

$0.250 M=\frac{x}{40 g/mol\times 0.450 L}$

Solving for x:

x = 4.5 g

Weigh 4.5 grams of sodium hydroxide and add it to the dry volumetric flask of 450 mL followed by small amount of water to dissolve all the NaOH .After this add the water upto tye mark of 450 mL.

4 0

4 years ago