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2 years ago

Write 2 difference between physical and chemical change. write an example in which both take place

Chemistry

2 answers:

OlgaM077 [116]2 years ago

8 0

Hey! Friend..

Chemical change is permanent change whereas physical change is temporary change in which only physical state of same matter is changed without affecting its chemical composition. So, physical change can be reversed to its original state.

e.g. water changing in vapour which again can condense to form water, is physical change whereas burning of woods to form ashes is a chemical change, as we can't reverse it to form wood again.

Hope u like the answer....

jeka57 [31]2 years ago

5 0

Answer:

1) A Physical change doesn't change the chemical composition of a substance while a chemical change does.

2) Physical changes are reversible, Chemical changes are not

Examples:

Physical: Melting ice to liquid water

Chemical: Burning up paper

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Air-bags can be inflated by the decomposition of sodium azide, NaN3. At 25.0◦C and 1.10 atm, what volume of N2(g) is produced by

Mashcka [7]

Answer:

V = 36.7L of $N_{2}$

Explanation:

1. Write the chemical reaction for the decomposition of sodium azide:

$_{2}NaN_{3}(l)=_{2}Na(s)+_{3}N_{2}(g)$

2. Find the number of moles of $N_{2}$ produced by the decomposition of 71.4g of $NaN_{3}$ :

$71.4gNaN_{3}*\frac{1molNaN_{3}}{65gNaN_{3}}*\frac{3molesN_{2}}{2molesNaN_{3}}=1.65molesN_{2}$

3. Use the ideal gas equation to find the Volume of $N_{2}$ occupied by 1.65 moles of $N_{2}$ , at the temperature and pressure given by the problem:

$PV=nRT$

Solving for V:

$V=\frac{nRT}{P}$

Converting the temperature from ◦C to K:

25◦C+273.15=298.15K

Replacing values:

$V=\frac{1.65mol*(0.082\frac{atm.L}{mol.K})*298.15K}{1.10atm}$

V=36.7L of $N_{2}$

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2 years ago

What are tidal conditions in science terms

Anon25 [30]

They are the tides and conditions of the oceans

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2 years ago

In a tissue that metabolizes glucose via the pentose phosphate pathway, C-1 of glucose would be expected to end up principally i

Mnenie [13.5K]

Answer:

Carbon dioxide

Explanation:

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1 year ago

Pls help ty so much!

Nitella [24]

$\quad \huge \quad \quad \boxed{ \tt \:Answer }$

$\qquad \tt \rightarrow \:mass = 11.42 \:\: grams$

____________________________________

$\large \tt Solution \: :$

$\qquad \tt \rightarrow \: Q = ms\Delta T$

$\textsf{Q = heat evolved/absorbed = 501 J}$

$\textsf{m = mass in gram = ?}$

$\textsf{s = specific heat = 0.45}$

$\textsf{ΔT = change in temp = 120 - 22.5 =97.5°C}$

$\large\textsf{Find m : }$

$\qquad \tt \rightarrow \: 501 = m \sdot(0.45) \sdot(97.5)$

$\qquad \tt \rightarrow \: 501 = m \sdot43.875$

$\qquad \tt \rightarrow \: m = \dfrac{501}{43.875}$

$\qquad \tt \rightarrow \: m \approx11.42 \: \: g$

Answered by : ❝ AǫᴜᴀWɪᴢ ❞

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1 year ago

How much work is done if an object moves 4.5 m in has 12 Newtons of force on it

Cloud [144]

The formula of work is Work (Joules)=Force (Newtons) · distance in the direction of the force (meters), therefore its just a matter of replacing factors.

Work done = 12 · 4.5= 54 joules

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2 years ago

Write 2 difference between physical and chemical change. write an example in which both take place​

Write 2 difference between physical and chemical change. write an example in which both take place