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3 years ago

Which of the following results in a chemical change in matter building a strong braiding hair or boiling water or Burning wood

2 answers:

8 0

Chemical reaction is something that the matter will change completely. if you un braid your hair didn't change or if you cool the water vapor its going to be liquid again but no way you can make the burning wood to its original state which means thats the chemical reaction

Molodets [167]3 years ago

8 0

Burning wood because once it is burned, you cannot change it back. Boiling water can be taken back to the form that it started at, and the same goes for hair.

You might be interested in

What is the temperature of 1.485 moles of N₂ gas at a pressure of 1.072 atm and a volume of 20 L?

morpeh [17]

Answer:

178.67K

Explanation:

PV=nRT

T=PV/nR

= 1.072atm*20L/1.485mol*0.0821LatmK^-1

=178.67K

8 0

4 years ago

The impact of fossil fuel combustion on the global carbon cycle

olga_2 [115]

When humans burn fossil fuels, the stored carbon is released into the atmosphere as carbon dioxide. The carbon is then free to cycle through the Earth and can upset the natural balance of the carbon available, changing the way that processes occur on Earth.

8 0

3 years ago

Why is it difficult to classify dissolving as simply a physical or a chemical change? (1 point)

Likurg_2 [28]

The correct answer is:Some substances keep the same molecular structure when they break down, and others do not.

Some substances change their form when they dissolve and some do not. Dissolution can sometimes be regarded as a sort of reaction between a chemical substance and water.

Usually, we can consider dissolution of a substance in water as a sort of chemical reaction for some substances. For instance, an ionic substance interacts with water to form ions. similarly, some salts become hydrolysed in water and give acidic/basic solutions as result of that.

However, some substances do not interact with water upon dissolution. They rather remain as molecular entities because they are not composed of ions.

We can see that some substances keep the same molecular structure when they break down, and others do not keep the same molecular structure when they dissolve hence it is difficult to classify dissolving as a physical or a chemical change.

brainly.com/question/1161517

6 0

3 years ago

Read 2 more answers

A large balloon is initially filled to a volume of 25.0 L at 353 K and a pressure of 2575 mm Hg. What volume of gas will the bal

bija089 [108]

Answer:

45.0 L is the volume of gas will the balloon contain at 1.35 atm and 253 K.

Explanation:

Using Ideal gas equation for same mole of gas as

$\frac {{P_1}\times {V_1}}{T_1}=\frac {{P_2}\times {V_2}}{T_2}$

Given ,

V₁ = 25.0 L

V₂ = ?

P₁ = 2575 mm Hg

Also, P (atm) = P (mm Hg) / 760

P₁ = 2575 / 760 atm = 3.39 atm

P₂ = 1.35 atm

T₁ = 353 K

T₂ = 253 K

Using above equation as:

$\frac {{P_1}\times {V_1}}{T_1}=\frac {{P_2}\times {V_2}}{T_2}$

$\frac{{3.39}\times {25.0}}{353}=\frac{{1.35}\times {V_2}}{253}$

$\frac{1.35V_2}{253}=\frac{3.39\times \:25}{353}$

Solving for V₂ , we get:

45.0 L is the volume of gas will the balloon contain at 1.35 atm and 253 K.

4 0

4 years ago

The density of a gold nugget is 19.3 g/cm3. If the volume of the gold nugget is 0.00369 L the mass of the nugget is

Sauron [17]

Answer:

The answer to your question is 71.22 g

Explanation:

Data

Density = 19.3 g/cm³

Volume = 0.00369

mass = ?

Formula

Density = $\frac{mass}{volume}$

Solve for mass

mass = density x volume

Process

1.- Convert volume from liters to cubic centimeters

1 l ---------------- 1000 cm³

0.00369l --------- x

x = (0.00369 x 1000 ) / 1

x = 3.69 cm³

2.- Substitution

mass = 19.3 x 3.69

3.- Simplification and result

mass = 71.22 g

6 0

3 years ago