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Observations That Help Us to Determine a Chemical Reaction

Que 3: Fill i...

Question

Que 3: Fill in the blanks with the hints provided:
boiling bubbles colour compound condensation element equation gases heat products reactants reaction reversed word

Hydrogen and carbon dioxide are .

If they are formed in a reaction you will see . This can be a sign

that a chemical has happened.

Other signs of a chemical reaction might be an increase in temperature if

_ is released or a change in __.

Physical changes like _ do not make new materials and are easily _ eg, by cooling which causes ___.

The substances you start with are called _, and after the chemical change what is formed are called the .

Zinc consists of only one type of atom so is called an _.

Carbon dioxide is made up of combining the different atoms carbon and oxygen

and is known as a ______.

A shorthand way of representing a chemical change is to use a _ ___________.

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Solution

A-1) gases, bubbles, reaction
A-2) heat, colour
A-3) boiling , reversed, condensation
A-4) reactants, products
A-5) element
A-6) compound
A-7) word equation

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Q. Hydrogen and carbon dioxide are gases. If they are formed in a reaction you will see bubble. This can be a sign that a chemical reaction has happened.

Write a balance chemical reaction for reaction between hydrogen and carbon dioxide gas.

Fill in the blanks :

(a) A reaction in which two or more substances combine to form a single substance is called a ___ reaction.

(b) A ___ is a substance which changes the rate of a chemical reaction without undergoing a chemical change.

(c) The formation of gas bubbles in a liquid during a reaction is called___

(d) The reaction between an acid and a base is called ___

(e) Soluble bases are called ___

(f) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction.

(g) In the type of reaction called ___ two compounds exchange their positive and negative radicals respectively.

(h) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction.

(i) The chemical reaction between hydogen and chlorine is a ___ reaction

(j) When a piece of copper is added to silver nitrate solutuions, it turns ___ in colour.

Q. Matter undergoes a change. The changes are of two types : Physical and chemical change. A physical change is a change that involves only a change in the physical state of matter.
Its chemical properties remain the same. Usually increasing the temperature of applying pressure or both brings about a physical change. On reversing the condition, i.e., reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible. A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, the chemical and physical properties of the substance is formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance. When zinc carbonate is heated and cooled, the change(s) that are observed are :

Q. Matter undergoes a change. The changes are of two types: Physical and chemical change.

A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.

A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

In a chemical change, the properties that change are :

Q. Other signs of a chemical reaction might be an increase in temperature if heat is released or a change in _____.

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