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3 years ago

What is the rest and motion?

Chemistry

2 answers:

notka56 [123]3 years ago

8 0

If a body is moving from one place to another, then the body is said to be in motion

Lostsunrise [7]3 years ago

7 0

Answer:

A body is said to be at rest of it does not change its position with respect to a fixed point taken as a reference point in its surroundings, with the passage of time.

A body is said to be in motion if it's changes its position continuously with respect to a fixed point, taken as a reference point in its surroundings, with the passage of time.

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How do humans spread Asian Carp?

Mama L [17]

Answer:

Explanation:

7 0

3 years ago

20 mL of an approximately 10% aqueous solution of ethylamine, CH3CH2NH2, is titrated with 0.3000 M aqueous HCl. Which indicator

Vinvika [58]

20 mL of an approximately 10% aqueous solution of ethylamine, CH3CH2NH2, is titrated with 0.3000 M aqueous HCl. Which indicator would be most suitable for this titration? The pKa of CH3CH2NH3+ is 10.75.

Answer:

Bromocresol green, color change from pH = 4.0 to 5.6

Explanation:

The equation for the reaction is as follows:

$C_2H_5NH_{2(aq)$ + $H^+_{(aq)$ ⇄ $C_2H_5NH_{3(aq)}^+$

Given that concentration of $C_2H_5NH_{2(aq)$ = 10%

i.e 10 g of $C_2H_5NH_{2(aq)$ in 100 ml solution

molar mass = 45.08 g/mol

number of moles = $\frac{10}{45.08}$

= 0.222 mol

Molarity of $C_2H_5NH_{2(aq)$ = 0.222 × $\frac{1000}{100}mL$

= 2.22 M

However, number of moles of $C_2H_5NH_{2(aq)$ in 20 mL can be determined as:

number of moles of $C_2H_5NH_{2(aq)$ = 20 mL × 2.22 M

= $44*10^{-3} mole$

Concentration of $C_2H_5NH_{2(aq)$ = $\frac{44*10^{-3}*1000}{20}$

= 2.22 M

Similarly, The pKa Value of $C_2H_5NH_{2(aq)$ is given as 10.75

pKb value will be: 14 - pKa

= 14 - 10.75

= 3.25

Finally, the pH value at equivalence point is:

pH= $\frac{1}{2}pKa - \frac{1}{2}pKb-\frac{1}{2}log[C]$

pH = $\frac{14}{2}-\frac{3.25}{2}-\frac{1}{2}log [2.22]$

pH = 5.21

∴

The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6.

6 0

4 years ago

How does an atom in ground state become excited?

forsale [732]

Electrons can become excited if it is given extra energy

Exampes:
⁻absorbs a photon
⁻absorbs packet of light
⁻absorbs collides wit nearby atom
⁻absorbs particles.

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4 years ago

When butanoic acid is reacted with methanol (using H2SO4 as a catalyst), what will be produced?

Aleks [24]

Answer:

alcohol (OH) + organic acid (COOH) → ester + water

Explanation:

example:

methanol + butanoic acid → methyl butanoate + watermethyl

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3 years ago

In an experiment to determine how to make sulfur trioxide, a chemist combines 32.0 g of sulfur with 50.0 g of oxygen. She finds

LuckyWell [14K]

Answer:

The chemist needs to react 40 g of sulfur with 60 g of oxygen to make 100 g of sulfur trioxide.

Explanation:

2S (s) + 3O₂ (g) → 2SO₃ (g)

64g + 96g → 160 g

32g + 48g → 80 g

x + y → 100 g

1 mol SO₃ ___ 80g

n _______ 100g

n = 1.25 mol SO₃

1 mol S ___ 32 g

1,25 mol S __ 40 g

1 mol O₂ ___ 32 g

1,875 mol O₂ ___ 60 g

4 0

3 years ago

What is the rest and motion?​

What is the rest and motion?