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3 years ago

How is a physical change diferent from a chemical change?

Chemistry

1 answer:

Airida [17]3 years ago

6 0

Answer:

Physical change is different in appearance while chemical change causes a new substance to form.

Explanation:

Hope this helps! :)

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Consider the chemical equation below. Upper M g (upper O upper H) subscript 2 plus 2 upper H upper N upper O subscript 3 right a

masha68 [24]

Answer:

Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O.

Explanation:

i just took the test , i hope this helps:)

8 0

3 years ago

Read 2 more answers

What is the definition of an atmosphere? a portion of the electromagnetic spectrum that makes the sky look blue the blanket of g

goldenfox [79]

Answer:

the blanket of gases that surrounds Earth and some other planets

Explanation:

The best definition of the atmosphere is that it is a portion of the earth that is a made up of a blanket of gases.

The atmosphere is not peculiar to the earth alone, some other planets also have atmospheric cover.
The earth's atmosphere is divided into many different layers.
The weather we see and experience on the earth surface is conditioned within the troposphere.
This troposphere is the closest layer to the surface.

7 0

3 years ago

What is 10% of 70 so I kmow

vaieri [72.5K]

10 x 70 = 100 x Part, or

700 = 100 x Part

Now, divide by 100 and get the answer:

Part = 700 / 100 = <span>7</span>

7 0

3 years ago

Read 2 more answers

Given the balanced equation: 2KClO₃ ---> 2KCl + 3O₂ How many moles of O₂ are produced when 4.0 moles of KCl are produced?

Verizon [17]

Answer:

The answer to your question is 6.0 moles of O₂

Explanation:

Data

2KClO₃ ⇒ 2KCl + 3O₂

moles of O₂ = ?

moles of KCl = 4

Process

To find the number of moles of O₂, use proportions and cross multiplication.

Use the coefficients of the balanced equation.

2 moles of KCl ----------------- 3 moles of O₂

4 moles of KCl ----------------- x

x = (4 x 3) / 2

-Simplification

x = 12/2

-Result

x = 6 moles of O₂

-Conclusion

When 4,0 moles of KCl are produced, 6.0 moles of O₂ will be produced.

6 0

2 years ago

In an electroplating process, copper (ionic charge +2e, atomic weight 63.6 g/mol) is deposited using a current of 10.0 A. What m

salantis [7]

Answer : The mass of copper deposit is, 1.98 grams

Explanation :

First we have to calculate the charge.

Formula used : $Q=I\times t$

where,

Q = charge = ?

I = current = 10 A

t = time = 10 min = 600 sec (1 min = 60 sec)

Now put all the given values in this formula, we get

$Q=10A\times 600s=6000C$

Now we have to calculate the number of atoms deposited.

As, 1 atom require charge to deposited = $2\times (1.6\times 10^{-19})$

Number of atoms deposited = $\frac{(6000)}{2\times(1.6\times 10^{-19})}=1.875\times 10^{22}$ atoms

Now we have to calculate the number of moles deposited.

Number of moles deposited = $\frac{(1.875\times 10^{22})}{(6.022\times 10^{23})}=0.03113$ moles

Now we have to calculate the mass of copper deposited.

1 mole of Copper has mass = 63.5 g

Mass of Copper Deposited = $63.5\times 0.03113 =1.98g$

Therefore, the mass of copper deposit is, 1.98 grams

5 0

3 years ago