64 Questions
What is the chemical formula for acetate?
( ext{CH}_3 ext{CO}^- )
What is the charge of the oxide anion?
-2
What is the chemical formula for the sulphate anion?
( ext{SO}_4^{2-} )
What is the chemical formula for the ammonium cation?
( ext{NH}_4^+ )
Why is it essential to balance the total positive and negative charges when writing the formula of a compound?
To ensure the compound is electrically neutral
What is the purpose of chemical formulae in chemistry?
To provide a concise way to represent the composition of compounds
What is the chemical formula for the phosphate anion?
( ext{PO}_4^{3-} )
What is the chemical formula for the nitrate anion?
( ext{NO}_3^- )
What is the first step in writing a chemical formula?
Identify the cation and anion
What is the purpose of balancing the charges in a chemical formula?
To ensure the stability of the compound
What is the valency of an ion?
The number of electrons it can gain or lose
What is the criss-cross method used for?
Writing chemical formulae
What unit is used to calculate the formula mass of a compound?
Atomic mass unit (amu)
What is the result of combining ions in a chemical formula?
An electrically neutral compound
What information does the oxidation state of an ion provide?
Its charge
What is the purpose of using subscripts in a chemical formula?
To indicate the number of each type of ion
What is the primary function of chemical formulae in chemistry?
To provide a concise way to represent the composition of compounds
Which anion has the chemical formula ( ext{HCO}_3^- )?
Hydrogen carbonate
What is the crucial step when writing the formula of a compound?
Balancing the total positive and negative charges
Which cation has the chemical formula ( ext{NH}_4^+ )?
Ammonium
What is the purpose of understanding common anions and cations?
To write chemical formulae
What is the charge of the chromate anion?
-2
Why are chemical formulae useful in chemistry?
They offer a concise way to represent the composition of compounds
What is the formula of the thiosulphate anion?
( ext{S}_2 ext{O}_3^{2-} )
What is the primary goal of balancing the charges when writing a chemical formula?
To result in an electrically neutral compound
What determines the number of ions needed to balance the charges in a chemical formula?
The valency of the ions
What is the result of swapping the charges of the ions and using them as subscripts for the opposite ion in the criss-cross method?
A chemical formula with balanced charges
What is the unit used to calculate the formula mass of a compound?
Atomic mass units (amu)
What information does the oxidation state of an ion provide?
The charge of the ion
What is the purpose of using subscripts in a chemical formula?
To indicate the number of each type of ion
What determines the stability of a compound?
The balance of the charges
What is the term for the combining capacity of an ion?
Valency
Which of the following anions has a charge of 2-?
Carbonate
What is the consequence of not balancing the total positive and negative charges in a chemical formula?
The compound becomes electrically charged
Which of the following statements is NOT true about common anions and cations?
They are always electrically neutral
What is the primary purpose of understanding common anions and cations?
To write chemical formulae
What is the result of combining a cation with an anion in a chemical formula?
A compound with a neutral charge
Which of the following is NOT a common anion?
Water
What determines the number of ions needed to balance the charges in a chemical formula?
The charge of the ion
What is the importance of using subscripts in a chemical formula?
To indicate the number of ions needed to balance the charges
What is the purpose of identifying the cation and anion in writing a chemical formula?
To balance the charges of the ions
What is the result of not balancing the charges in a chemical formula?
The compound would not exist in a stable form
What is the term for the process of adjusting the number of cations and anions to balance the charges?
Balancing
What is the purpose of using the criss-cross method in writing chemical formulae?
To write the chemical formula of a compound
What is the unit used to express the formula mass of a compound?
Atomic mass units (amu)
What information does the oxidation state of an ion provide?
The charge of the ion
What determines the number of ions needed to balance the charges in a chemical formula?
The charge of the ions
What is the primary goal of balancing the charges when writing a chemical formula?
To ensure the stability of the compound
What is the fundamental principle underlying the formation of chemical compounds from ions?
The total positive and negative charges must be balanced.
Which of the following statements about chemical formulae is true?
Chemical formulae can be used to represent the composition of all types of compounds.
What is the primary purpose of understanding common anions and cations in chemistry?
To write chemical formulae for compounds.
What is the consequence of not balancing the total positive and negative charges in a chemical formula?
The compound will be unstable.
Which of the following is a characteristic of a chemical formula?
It represents the composition of a compound.
What is the importance of using subscripts in a chemical formula?
To indicate the number of atoms of an element in the compound.
What is the primary goal of balancing the charges when writing a chemical formula?
To ensure the compound is electrically neutral.
Which of the following is a common misconception about chemical formulae?
Chemical formulae can be used to represent the physical properties of a compound.
What is the primary consideration when combining ions in a chemical formula?
The total positive charge balancing the total negative charge
Why is the concept of valency important in writing chemical formulae?
It indicates the ion's ability to form a full outer shell
What is the purpose of using subscripts in a chemical formula?
To show the ratio of ions in the compound
What happens when the charges of the ions are not balanced in a chemical formula?
The compound does not exist
What is the purpose of calculating the formula mass of a compound?
To determine the relative mass of compounds in reactions
What is the criss-cross method used to achieve?
To write the chemical formula of a compound
What is the term for the process of adjusting the number of cations and anions to balance the charges?
Charge balancing
What is the result of understanding the oxidation state of an ion?
Knowing the ion's ability to gain or lose electrons
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