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3 years ago

How is chemical change different from a physical change?

Chemistry

1 answer:

natka813 [3]3 years ago

5 0

A physical change changes the form of the matter, but does not change the substance itself.

A chemical change affects the substance and turns into a different substance.

Ex:

Physical change: Water freezes- its changes form, but it is still water

Chemical change: Wood burns- it is changing its makeup from wood to ash and various gases. You cant identify it as wood anymore.

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An aqueous solution of hydrobromic acid is standardized by titration with a 0.164 M solution of calcium hydroxide. If 14.9 mL of

Arada [10]

Answer:

The molarity of hydrobromic acid is 0.182 M

Explanation:

Step 1: Data given

Molarity of Calcium hydroxide = 0.164 M

Volume of calcium hydroxide = 14.9 mL = 0.0149 L

Volume of HBr = 26.9 mL = 0.0269 L

Step 2: The balanced equation

Ca(OH)2 + 2HBr →CaBr2 + 2H2O

Step 3: Calculate molarity of HBr

b*Ca*Va = a*Cb*Vb

⇒b = the coefficient of HBr = 2

⇒Ca = the molarity of Ca(OH)2 = 0.164 M

⇒Va = the volume of ca(OH)2 = 0.0149 L

⇒a= the coefficient of Ca(OH)2 = 1

⇒Cb = the molarity of HBr = TO BE DETERMINED

⇒Vb = the volume of HBr = 0.0269 L

2*0.164 * 0.0149 = 1*Cb*0.0269

Cb = 0.182 M

The molarity of hydrobromic acid is 0.182 M

6 0

4 years ago

Explain what needs to happen for the box to start moving

VMariaS [17]

Answer:

It needs an force in the opposite direction.

Explanation:

Example:

The box is on a flat surface. You use your hands to push it. You have to push it in the opposite direction.

4 0

3 years ago

Fe(s) + O2 (g) → Fe3+ O2− What most likely happens during this reaction?

Musya8 [376]

Answer : The most likely happens during this reaction is, Oxidation-reduction

Explanation :

The balanced reaction will be,

$4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)$

In this reaction, neutral iron loses 3 electrons and oxidizes in (+3) state, $Fe^{3+}$ and neutral oxygen gains 2 electrons and reduces in (-2) state, $O^{2-}$

When iron react with oxygen gas to give iron oxide. This process is known as iron rusting. During the reaction, oxidation-reduction process occurs.

Oxidation : It is a type of chemical reaction in which a substance loses its electrons. Or we can say that in oxidation, the oxidation number increases.

Reduction : It is a type of chemical reaction in which a substance gains its electrons. Or we can say that in reduction, the oxidation number decreases.

5 0

4 years ago

In the Rutherford nuclear-atom model, ________.

max2010maxim [7]

A, the protons and neutrons are heavier than electrons. The electrons orbit the nucleus, and have negligible mass.

3 0

2 years ago

As I sipped my diet coke, I stared at the ice cubes in my drink. My mind wandered.

Sauron [17]

Answer:

24.3

Explanation:

I used a calculator and did 3x3x3=27 27x0.90=24.3

7 0

4 years ago