Quiz Chapter 2 - Chemistry103 ( Pharmacgy ) | Attempts: 282

2.

Which of the following elements consider metal ?

Na
C
N
He

Correct Answer

A. Na

Explanation

Na (sodium) is considered a metal because it is a solid at room temperature, has a shiny appearance, is malleable and ductile, and conducts electricity. In contrast, C (carbon), N (nitrogen), and He (helium) are non-metals.

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3.

The charge of elements in group 8A is :

+1
-1
-3
Zero

Correct Answer

A. Zero

Explanation

The charge of elements in group 8A is zero because these elements have a full valence shell of electrons. Group 8A elements, also known as noble gases, have a stable electron configuration with 8 valence electrons (except for helium with 2 valence electrons). As a result, they do not readily gain or lose electrons to form ions, thus having a charge of zero.

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4.

Which of the following compounds consider ionic ?

MgS
H2O
CH4
N2O3

Correct Answer

A. MgS

Explanation

MgS is considered ionic because it is formed by the combination of a metal (Mg) and a non-metal (S). In an ionic compound, electrons are transferred from the metal to the non-metal, resulting in the formation of positive and negative ions. In the case of MgS, magnesium loses two electrons to become Mg2+ ion, while sulfur gains two electrons to become S2- ion. The attraction between these oppositely charged ions holds the compound together, making it ionic.

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5.

The correct empirical formula produces from Li and N :

LiN
Li₂N₃
Li₃N
Li₃N₂

Correct Answer

A. Li₃N

Explanation

The correct empirical formula is Li3N because it represents the simplest ratio of atoms in the compound. The subscript 3 next to Li indicates that there are three lithium atoms, while the subscript 1 next to N indicates that there is one nitrogen atom. This ratio of three lithium atoms to one nitrogen atom is the simplest whole-number ratio that represents the composition of the compound.

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6.

Which of the following elements consider non-metal ?

Na
Cl
K
Al

Correct Answer

A. Cl

Explanation

Cl (chlorine) is considered a non-metal because it is located on the right side of the periodic table. Non-metals generally have properties such as low melting and boiling points, poor conductivity of heat and electricity, and tend to gain electrons in chemical reactions. Chlorine is a halogen and is known for its strong oxidizing properties. It exists as a gas at room temperature and is highly reactive.

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7.

Salt X₃P₂, the X ion in this salt has 10 electrons , the metal X is :

Ca
Na
Mg
Al

Correct Answer

A. Mg

Explanation

The X ion in the salt X3P2 has 10 electrons. This means that the X ion has a charge of 2- since it has gained 2 electrons to reach a stable electron configuration. The only metal in the options that commonly forms a 2- ion is magnesium (Mg). Therefore, the metal X in the salt is magnesium.

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8.

The ionic compound from Al and N , Li and S respectively ?

AlN , LiS₂
Al₂N , Li₂S
AlN , Li₂S
AlN₂ , LiS

Correct Answer

A. AlN , Li₂S

Explanation

The correct answer is AlN and Li2S. AlN is the ionic compound formed between aluminum (Al) and nitrogen (N), while Li2S is the ionic compound formed between lithium (Li) and sulfur (S). In ionic compounds, metals lose electrons to form positive ions (cations), while nonmetals gain electrons to form negative ions (anions). Therefore, AlN is formed by the transfer of one electron from Al to N, resulting in Al3+ and N3- ions. Li2S is formed by the transfer of two electrons from two Li atoms to one S atom, resulting in 2 Li+ ions and S2- ion.

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9.

When a metal and non-metal react , the tends to lose electrons and the tends to gain electrins .

Metal , metal
Non-metal , non-metal
Metal , non-metal
Non-metal , metal

Correct Answer

A. Metal , non-metal

Explanation

In a reaction between a metal and a non-metal, the metal tends to lose electrons and the non-metal tends to gain electrons. This is because metals have fewer electrons in their outermost energy level and are more likely to lose them to achieve a stable electron configuration. On the other hand, non-metals have more electrons in their outermost energy level and are more likely to gain electrons to achieve a stable electron configuration. This transfer of electrons from the metal to the non-metal results in the formation of an ionic bond.

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10.

Which pair of elements would you expect to exhibit the greatest similarity in their chemical and physical properties ?

C , N
O , S
K , Ca
H , He

Correct Answer

A. O , S

Explanation

Oxygen (O) and sulfur (S) would be expected to exhibit the greatest similarity in their chemical and physical properties. This is because they both belong to the same group in the periodic table, Group 16 (also known as the oxygen group or chalcogens). Elements in the same group tend to have similar properties due to the same number of valence electrons. Oxygen and sulfur both have 6 valence electrons, which means they have similar reactivity and can form similar types of chemical bonds. Additionally, they have similar atomic sizes and electronegativities, which further contributes to their similarity in properties.

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Quiz Chapter 2 - Chemistry103 ( Pharmacgy )

The group 2A called ?

Quiz Preview

Which of the following elements consider metal ?

The charge of elements in group 8A is :

Which of the following compounds consider ionic ?

The correct empirical formula produces from Li and N :

Which of the following elements consider non-metal ?

Salt X₃P₂, the X ion in this salt has 10 electrons , the metal X is :

The ionic compound from Al and N , Li and S respectively ?

When a metal and non-metal react , the tends to lose electrons and the tends to gain electrins .

Which pair of elements would you expect to exhibit the greatest similarity in their chemical and physical properties ?

Quiz Chapter 2 - Chemistry103 ( Pharmacgy )

The group 2A called ?

Quiz Preview

Which of the following elements consider metal ?

The charge of elements in group 8A is :

Which of the following compounds consider ionic ?

The correct empirical formula produces from Li and N :

Which of the following elements consider non-metal ?

Salt X3P2 , the X ion in this salt has 10 electrons , the metal X is :

The ionic compound from Al and N , Li and S respectively ?

When a metal and non-metal react , the ______ tends to lose electrons and the ______ tends to gain electrins .

Which pair of elements would you expect to exhibit the greatest similarity in their chemical and physical properties ?

Salt X₃P₂, the X ion in this salt has 10 electrons , the metal X is :

When a metal and non-metal react , the tends to lose electrons and the tends to gain electrins .