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Reil [10]
2 years ago
13

A skateboarder coasts a distance of 20 meters in 4 seconds. What is the person's speed?

Chemistry
1 answer:
yKpoI14uk [10]2 years ago
5 0

Answer:

5

Explanation:

20/4

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How many metals, nonmetals and metalloids are there in the periodic table?
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Answer:

95 metals

17 nonmetals

6 metalloids

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2 years ago
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Convert from 300 calories to calories (kicalories)? <br> Please help mee
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Answer:

0.3 kicalories

Explanation:

300/1000

=0.3

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4 0
2 years ago
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A mixture of noble gases [helium (MW 4), argon (MW 40), krypton (MW 83.8), and xenon (MW 131.3)] is at a total pressure of 150 k
kodGreya [7K]

Answer:

a) 1,6%

b) 64,775 g/mol

c) 3,6×10⁻² M

d) 2,3×10⁻³ g/mL

Explanation:

a) The mass fractium of helium is obtained converting the moles of the four gases to grams with molar weight and then caculating of the total of grams how many are of helium, thus:

  • Helium: 0,25 moles ×\frac{4 g}{1 mol} = 1 g of Helium
  • Argon: 0,25 moles ×\frac{40 g}{1 mol} = 10 g of Argon
  • Krypton: 0,25 moles ×\frac{83,8 g}{1 mol} = 20,95 g of krypton
  • Xenon: 0,25 moles ×\frac{131,3 g}{1 mol} = 32,825 g of Xenon

Total grams: 1g+10g+20,85g+30,825g= 62,675 g

Mass fraction of helium: \frac{1 gHelium}{62,675 g} × 100 = <em>1,6%</em>

<em />

<em>The mass fraction of Helium is 1,6%</em>

<em />

<em>b)</em><em>  </em>Because the mole fraction of all gases is the same the average molecular weight of the mixture is:

\frac{4+40+83,8+131,3}{4} = 64,775 g/mol

c) The molar concentration is possible to know ussing ideal gas law, thus:

\frac{P}{R.T} = M

Where:

P is pressure: 150 kPa

R is gas constant: 8,3145\frac{L.kPa}{K.mol}

T is temperature: 500 K

And M is molar concentration. Replacing:

M = 3,6×10⁻² M

d) The mass density is possible to know converting the moles of molarity to grams with average molecular weight and liters to mililiters, thus:

3,6×10⁻² \frac{mol}{L} × \frac{64,775 g}{mol} × \frac{1L}{1000 mL} =

2,3×10⁻³ g/mL

I hope it helps!

7 0
3 years ago
Which scenario represents an unbalanced force?
ladessa [460]

A . A person Jumping represents an unbalanced force.

<u>Explanation:</u>

If equal amount of force applied on any object from both the directions, then the object will not move and so the force is a balanced force.

If an unequal amount of force on an object from both sides then the object will move in the opposite direction of the maximum force applied, so it is called as an unbalanced force.

  • When the force is unbalanced then its velocity will change, so options C and D are omitted.
  • In Option B the vase is sitting on a table, just kept so there is no action of any unbalanced force.
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You know the following about a coordination compound:(1) The partial empirical formula is KM(CrO₄)Cl₂(NH₃)₄.(2) It has A (red) a
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Stereochemistry, a subdiscipline of chemistry, involves the study of the relative spatial arrangement of atoms that form the structure of molecules and their manipulation.

<h3>What is the use of stereochemistry?</h3>

Using stereochemistry, chemists can work out the relationships between different molecules that are made up from the same atoms. They can also study the effect on the physical or biological properties these relationships give molecules.

<h3>Why is it called stereochemistry?</h3>

The term “stereochemistry” is derived from the Greek “stereos” meaning solid—it refers to chemistry in three dimensions. Since nearly all organic molecules are three dimensional (with the exception of some olefins and aromatics to be discussed later), stereochemistry cannot be considered a branch of chemistry.

Learn more about stereochemistry here:

<h3>brainly.com/question/13266152</h3><h3 /><h3>#SPJ4</h3>

7 0
2 years ago
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