GCSE Chemistry Quiz

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1/10 Questions

Chemical reactions where heat energy is given out are described as exothermic.
- True
- False

About This Quiz

Is chemistry your favorite subject? Or is it a subject that you want to excel in? Why don't you take our GCSE chemistry quiz that we have made here for you? If we describe it in simple words, chemistry is all about different elements and how or when they react with each other and what happens. However, chemistry is not See moreat all as simple as this simple definition. With some questions here, you can practice and better your chemistry knowledge.

2.

Sodium is the least reactive element.
- True
- False
Correct Answer

A. False

Explanation

Sodium is actually a highly reactive element. It is a member of the alkali metal group, which is known for its high reactivity. Sodium readily reacts with water, oxygen, and many other substances. It is stored in oil to prevent its reaction with air. Therefore, the statement that sodium is the least reactive element is false.

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2
3.

Exothermic reaction can be shown as ΔH.
- True
- False
Correct Answer

A. False

Explanation

The statement is incorrect because exothermic reactions are represented by a negative value of ΔH, indicating that heat is released during the reaction. The symbol ΔH represents the change in enthalpy, which is a measure of heat energy. Therefore, the correct statement would be that an exothermic reaction can be shown as -ΔH.

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2
4.

Chemical reactions where heat energy is taken in are described as Endothermic.
- True
- False
Correct Answer

A. True

Explanation

Chemical reactions that absorb or take in heat energy are known as endothermic reactions. In these reactions, the reactants absorb heat from their surroundings, resulting in a decrease in the temperature of the surroundings. This is why endothermic reactions often feel cold to the touch. The statement "True" confirms that the given explanation is correct.

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1
5.

K is the symbol of hydrogen.
- True
- False
Correct Answer

A. False

Explanation

The symbol for hydrogen is H, not K. Therefore, the statement "K is the symbol of hydrogen" is false.

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2
6.

H2O is the symbol of water.
- True
- False
Correct Answer

A. True

Explanation

The symbol for water is H2O because it consists of two hydrogen atoms and one oxygen atom. This combination of atoms creates the chemical formula for water, which is H2O. Therefore, the statement "H2O is the symbol of water" is true.

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7.

For an element to react, it should have more than 8 electrons.
- True
- False
Correct Answer

A. False

Explanation

The statement is not accurate. For an element to react, it does not necessarily need to have more than 8 electrons. The reactivity of an element depends on its electron configuration and the number of valence electrons it has. Some elements with fewer than 8 electrons in their outermost energy level can still be reactive, such as the alkali metals which have only 1 valence electron. Therefore, the statement is false.

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1
8.

In an exothermic reaction the heat energy is being given out, therefore energy is lost.
- True
- False
Correct Answer

A. True

Explanation

In an exothermic reaction, heat energy is released to the surroundings, resulting in a decrease in the system's internal energy. This release of energy is often observed as an increase in temperature or the production of light. Therefore, it is correct to say that energy is lost in an exothermic reaction.

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1
9.

Endothermic reactions can be shown as +ΔH.
- True
- False
Correct Answer

A. True

Explanation

Endothermic reactions are chemical reactions that absorb heat from their surroundings. The symbol ΔH represents the change in enthalpy, which is the heat absorbed or released during a reaction. When a reaction is endothermic, it means that the enthalpy change is positive, indicating that heat is being absorbed. Therefore, the statement "+ΔH" accurately represents endothermic reactions, making the answer "True".

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10.

The making of bonds is also known as morphism.
- True
- False
Correct Answer

A. False

Explanation

The statement is false because the making of bonds is not known as morphism. Morphism refers to a concept in mathematics and category theory that describes the relationship between two mathematical objects. Bonds, on the other hand, are typically associated with chemistry and refer to the connection between atoms in a molecule. While there may be some similarities in the sense that both involve a connection or relationship, they are not synonymous terms.

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1

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Quiz Edited by
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Mar 28, 2012

Quiz Created by
Mojoabidi

GCSE Chemistry Quiz

Chemical reactions where heat energy is given out are described as exothermic.

Quiz Preview

Sodium is the least reactive element.

Exothermic reaction can be shown as ΔH.

Chemical reactions where heat energy is taken in are described as Endothermic.

K is the symbol of hydrogen.

H2O is the symbol of water.

For an element to react, it should have more than 8 electrons.

In an exothermic reaction the heat energy is being given out, therefore energy is lost.

Endothermic reactions can be shown as +ΔH.

The making of bonds is also known as morphism.