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olasank [31]
3 years ago
5

A _____________________ change does not change what a substance is. If heat is added to ice, a physical change occurs because on

ly the _______________ of matter has changed. The term for changing a solid to a liquid is _________________. Adding more heat can turn the water into a gas, or _____________. The term for changing a liquid to a gas is __________________. Changes of state can be reversed as well. A gas turns into a liquid by _____________________. A liquid turns into a solid by ______________________. On very rare occasions, a solid turns into a gas through _____________________. The reverse is a gas turning into solid, or _________________________. ______________________ change produces a new substance because a chemical reaction has taken place. We know baking a cake is a chemical change because the flour, eggs, sugar, and other ingredients cannot be returned to their original structures. We know that a chemical change occurs when heat or ___________________ is released or absorbed, when a ______________ or bubbles form, or when a solid or ________________________ forms
Chemistry
1 answer:
sertanlavr [38]3 years ago
6 0

Answer:

<em>physical, state, melting, vapour, evaporation, condensation, freezing, sublimation, deposition or reverse sublimation, chemical, energy, effevescence and liquids</em><em> are suitable terms to fill the gaps. See the explanaition</em>

Explanation:

Changes of state are physical changes in matter. They are reversible changes that do not involve changes in matter's chemical makeup or chemical properties. Common changes of state include melting, freezing, sublimation, deposition, condensation, and vaporization. Thus

A <em>________physical_____________ </em>change does not change what a substance is. If heat is added to ice, a physical change occurs because only the <em>______state_________ </em>of matter has changed. The term for changing a solid to a liquid is <em>_____melting____________</em>. Adding more heat can turn the water into a gas, or <em>___vapour__________</em>. The term for changing a liquid to a gas is <em>_______evaporation___________</em>. Changes of state can be reversed as well. A gas turns into a liquid by <em>________condensation_____________</em>. A liquid turns into a solid by <em>_________freezing____________</em>. On very rare occasions, a solid turns into a gas through <em>_______sublimation______________</em>. The reverse is a gas turning into solid, or <em>_______deposition or reverse sublimation___</em>. <em>________chemical______________ </em>change produces a new substance because a chemical reaction has taken place. We know baking a cake is a chemical change because the flour, eggs, sugar, and other ingredients cannot be returned to their original structures. We know that a chemical change occurs when heat or <em>________energy___________ </em>is released or absorbed, when a <em>______effevescence________ </em>or bubbles form, or when a solid or ________<em>liquids</em>________________ forms.

Also note the following points about physical and chemical change.

  • Physical Change

Physical changes are changes in which no bonds are broken or formed. This means that the same types of compounds or elements that were there at the beginning of the change are there at the end of the change. Because the ending materials are the same as the beginning materials, the properties (such as color, boiling point, etc) will also be the same.  A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. When we heat the liquid water, it changes to water vapor. But even though the physical properties have changed, the molecules are exactly the same as before.

  • Chemical Change

Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties. Chemical changes are frequently harder to reverse than physical changes.

One good example of a chemical change is burning a candle. The act of burning paper actually results in the formation of new chemicals (carbon dioxide and water).

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Ethylene produced by fermentation has a specific gravity of 0.787 at 25 degree Celsius. What is the volume of 125g of ethanol at
WITCHER [35]

<u>Answer:</u> The volume of given amount of ethanol at this temperature is 159.44 mL

<u>Explanation:</u>

Specific gravity is given by the formula:

\text{Specific gravity}=\frac{\text{Density of a substance}}{\text{Density of water}}

We are given:

Density of water = 0.997 g/mL

Specific gravity of ethanol = 0.787

Putting values in above equation, we get:

0.787=\frac{\text{Density of a substance}}{0.997g/mL}\\\\\text{Density of a substance}=(0.787\times 0.997g/mL)=0.784g/mL

Density is defined as the ratio of mass and volume of a substance.

\text{Density}=\frac{\text{Mass}}{\text{Volume}} ......(1)

Given values:

Mass of ethanol = 125 g

Density of ethanol = 0.784 g/mL

Putting values in equation 1, we get:

\text{Volume of ethanol}=\frac{125g}{0.784g/mL}=159.44mL

Hence, the volume of given amount of ethanol at this temperature is 159.44 mL

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