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4 years ago

Is heating water in a pan a chemical or physical change? Need Reasons!!!

Chemistry

2 answers:

Cerrena [4.2K]4 years ago

8 0

It is only a physical change as you are only changing the state of the substance (from liquid to gas)

dezoksy [38]4 years ago

5 0

I would say Physical because it is still water, it's just water being heated up.

Physical change is probably your answer.

Glad I could help, and good luck!

You might be interested in

In my class we were watching a movie. The teacher gave us a review worksheet and she asked: Do you think the world will end this

Serggg [28]

Um for this question it is all about your beliefes and how you view them.

6 0

3 years ago

What is the cost in dollars for the nails used to build a fence 80 meters long if it requires 30 nails per meter? There are 40 n

svet-max [94.6K]

Answer:

4500 cent

Explanation:

From the question, we were told that

a fence 80 meters long requires 30 nails per meter.

1 metre fence = 30 nails

Then 80 meters long= ( 30 × 80)

= 2400 nails

Which means a fence 80 meters long will require 2400 nails in total.

We need to find the cost in dollars for the nails to build a fence 80 meters long.

We know that 40 nails per box will cost 75 cents per box.

(2400 nails/40 nail per box)= 60 box

Then 60 box will be needed to complete the fence.

the cost in dollars for the nails to build a fence 80 meters long= (60 box × 75 cent per box)=4500 cent

7 0

3 years ago

A 0.590 gram sample of a metal, M, reacts completely with sulfuric acid according to:

Naddik [55]

Answer:

Molar mass of the metal = 59.0 g/mol

Explanation:

Vapor pressure of water at $25^oC$ = 23.78 torr

We are given:

Total vapor pressure = 756.0 torr

Vapor pressure of hydrogen gas = Total vapor pressure - Vapor pressure of water = (756.0 - 23.78) torr = 732.22 torr

To calculate the amount of hydrogen gas collected, we use the equation given by ideal gas which follows:

$PV=nRT$

where,

P = pressure of the gas = 732.22 torr

V = Volume of the gas = 255 mL = 0.255 L ( 1 mL = 0.001 L )

T = Temperature of the gas = $25^oC=[25+273]K=298K$

R = Gas constant = $62.3637\text{ L.torr }mol^{-1}K^{-1}$

n = number of moles of hydrogen gas = ?

Putting values in above equation, we get:

$732.22 torr\times 0.255L=n\times 62.3637\text{ L.torr }mol^{-1}K^{-1}\times 298K\\\\n=\frac{732.22\times 0.255}{62.3637\times 298}=0.01mol$

From the reaction shown below:-

$M+H_2SO_4\rightarrow MSO_4+H_2$

1 mole of hydrogen gas is produced when 1 mole of the metal is reacted.

Also,

0.01 mole of hydrogen gas is produced when 0.01 mole of the metal is reacted.

Moles of the metal = 0.01 mol

Mass taken = 0.590 g

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$0.01\ mole= \frac{0.590\ g}{Molar\ mass}$

Molar mass of the metal = 59.0 g/mol

5 0

4 years ago

Read 2 more answers

Apply scientific knowledge and understanding to determine how many grams of carbon dioxide are produced from the combustion of 2

lidiya [134]

Answer:

749 grams CO₂

Explanation:

To find the amount of carbon dioxide produced, you need to (1) convert grams C₃H₈ to moles C₃H₈ (via molar mass from periodic table), then (2) convert moles C₃H₈ to moles CO₂ (via mole-to-mole ratio via reaction coefficients), and then (3) convert moles CO₂ to grams CO₂ (via molar mass from periodic table). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The desired unit should be in the numerator. The final answer should have 3 significant figures because the given value (250. grams) has 3 sig figs.

Molar Mass (C₃H₈): 3(12.01 g/mol) + 8(1.008 g/mol)

Molar Mass (C₃H₈): 44.094 g/mol

1 C₃H₈ + 5 O₂ ---> 3 CO₂ + 4 H₂O

Molar Mass (CO₂): 12.01 g/mol + 2(16.00 g/mol)

Molar Mass (CO₂): 44.01 g/mol

250. g C₃H₈ 1 mole C₃H₈ 3 moles CO₂ 44.01 g
------------------ x ---------------------- x ---------------------- x -------------------- =
44.094 g 1 mole C₃H₈ 1 mole CO₂

= 749 grams CO₂

6 0

2 years ago

What is 2 H2 + 1 O2 = 2 H2O balanced?

jeka57 [31]

Answer:

Yes, that is correctly balanced. 2 H2 + 1 O2 = 2 H2O is already balanced.

Explanation:

If you count up the number of hydrogen atoms and oxygen atoms on each side, you will see that they are equal:

2 H2 + 1 O2 (4 hydrogen and 2 oxygen) = 2 H2O (4 hydrogen and 2 oxygen).

3 0

3 years ago