Unit 3 Practice Questions

Check out the Unit 3 Review Guide to help you as you try practice questions. Remember to press submit and exit out the formative to check your answers. 

Help Videos for Practice Questions:  Questions 5-9  Questions 10-16  Questions 17-20   Questions 21-24

1

In the metal reactivity lab, magnesium metal reacted with hydrochloridc acid to form hydrogen gas and magnesium chloride. The reaction is shown below.

HCl (aq) + Mg (s) --> H2 (g) + MgCl2 (aq)

In this reaction there was .5g of HCl solution added to .25g of magnesium(Mg) metal. The student measured the final magnesium chloride solution (MgCl2) to be .60g. How many grams of hydrogen gas (H2) were produced by this reaction?

1

Use the law of conservation of mass to explain how you figured out in question 1.

Law of conservation of mass- Matter cannot be created nor destroyed

Total Mass of reactants = Total Mass of Products

1

In the metal reactivity lab, magnesium metal reacted with hydrochloridc acid to form hydrogen gas and magnesium chloride. The reaction is shown below.

HCl (aq) + Mg (s) --> H2 (g) + MgCl2 (aq)

In this reaction there was .5g of HCl solution added to .25g of magnesium(Mg) metal. The student measured the final magnesium chloride solution (MgCl2) to be .60g. Why did the mass of magnesium in the products increase?

1

In the metal reactivity lab, magnesium metal reacted with hydrochloridc acid to form hydrogen gas and magnesium chloride. The reaction is shown below.

___HCl (aq) + _Mg (s) --> _H2 (g) + ___MgCl2 (aq)

What are the coefficients for the balanced equation?

1

Which of the elements below shows the correct electron configuration or Lewis Dot Structure for the element? Select All That Apply.

1

What is always true for chemical reactions that form ionic bonds? (Select All that Apply)

1

In general, ionic bonds form between a metal and a nonmetal. Covalent bonds usually form between two nonmetals. Which of the following pairs of atoms is most likely to form a covalent bond?

1

Potassium reacts so strongly when placed in water because.... (Select All that Apply)

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Drag each statement under the correct category (metal or nonmetal)

Sodium (Na)
Fluorine (F)
Tends to lose electrons to form + cations
Tends to gain electrons to form - anions
Is more reactive as the atomic radius gets larger
Is more reactive as the atomic radius gets smaller
An element with 2 valence electrons
An element with 6 valence electrons

Metals
Nonmetals

Help Video:  Questions 6-12  

1

Which of the following statements are true about ionic bonding between two atoms?

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Which list of elements below are arranged from largest to smallest atomic radius?

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Which of the following is true? Select All that apply

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Which of the following best describes the type of bond formed when sodium reacts with chlorine and the correct chemical formula for the product of the reaction?

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If Mg (Magnesium) forms an ionic bond with Cl (Chlorine), what is the correct ratio of magnesium to chlorine ions in the compound?

1

Using the ratio of ions from the question above, what is the correct chemical formula when Magnesium (Mg) and chlorine (Cl) react to form an ionic compound?

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Which is the correct balanced chemical reaction for when magnesium (Mg) and chlorine (Cl) react? (Hint: Chlorine is diatomic so it will bond with itself in nature as an element)

Help Video:   Questions 13-16   

1

Hydrogen can act as a metal or a nonmetal and can easily form a +1 or -1 ion depending on who it reacts with. Fill in the blanks below:

When hydrogen reacts with oxygen, two hydrogen (H) form a _____ (+1,-1) ion while oxygen (O) forms a _ (+2,-2) ion. When hydrogens reacts with magnesium (Mg), two hydrogen (H) forms a _ (+1,-1) ion while magnesium (Mg) forms a _____(+2,-2) ion.

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What is the chemical name for the ionic compound that forms after Hydrogen (H) and Phosphorous (P) react?

1

What are the correct coefficients in order to balance the chemical reaction below:

K + S --> K2S

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Which is the correct balanced chemical reaction for when Hydrogen (H) and Phosphorous (P) react? (Hint: Determine the + and - ions that will form for the prodcut 1st and then check to see that the reaction
is balanced)

Help Video: Questions 17-20

1

Lithium undergoes a combustion reaction by reacting with oxygen in the air. Show all the steps for the ionic bond that forms between Lithium and oxygen. Which of the following is true? (Select all that apply)

1

Lithium undergoes a combustion reaction by reacting with oxygen in the air. What ions will Li and O form?

1

Lithium undergoes a combustion reaction by reacting with oxygen in the air. Based on the cation and anion formed from the question above, determine the chemical formula and chemical name of the product that forms.

1

Iodine and chlorine are both nonmetals and halogens located in group 17 on the periodic table. Iodine is less reactive than chlorine. Which BEST explains why?

Use the law of conservation of mass to explain how you figured out in question 1.Law of conservation of mass- Matter cannot be created nor destroyedTotal Mass of reactants = Total Mass of Products

In the metal reactivity lab, magnesium metal reacted with hydrochloridc acid to form hydrogen gas and magnesium chloride. The reaction is shown below._____HCl (aq) + _____Mg (s) --> _____H2 (g) + _____MgCl2 (aq)What are the coefficients for the balanced equation?

Which of the elements below shows the correct electron configuration or Lewis Dot Structure for the element? Select All That Apply.

What is always true for chemical reactions that form ionic bonds? (Select All that Apply)

In general, ionic bonds form between a metal and a nonmetal. Covalent bonds usually form between two nonmetals. Which of the following pairs of atoms is most likely to form a covalent bond?

Potassium reacts so strongly when placed in water because.... (Select All that Apply)

Drag each statement under the correct category (metal or nonmetal)

Which of the following statements are true about ionic bonding between two atoms?

Which list of elements below are arranged from largest to smallest atomic radius?

Which of the following is true? Select All that apply

Which of the following best describes the type of bond formed when sodium reacts with chlorine and the correct chemical formula for the product of the reaction?

If Mg (Magnesium) forms an ionic bond with Cl (Chlorine), what is the correct ratio of magnesium to chlorine ions in the compound?

Using the ratio of ions from the question above, what is the correct chemical formula when Magnesium (Mg) and chlorine (Cl) react to form an ionic compound?

Which is the correct balanced chemical reaction for when magnesium (Mg) and chlorine (Cl) react? (Hint: Chlorine is diatomic so it will bond with itself in nature as an element)

What is the chemical name for the ionic compound that forms after Hydrogen (H) and Phosphorous (P) react?

What are the correct coefficients in order to balance the chemical reaction below: ____K + ____S --> ____K2S

Which is the correct balanced chemical reaction for when Hydrogen (H) and Phosphorous (P) react? (Hint: Determine the + and - ions that will form for the prodcut 1st and then check to see that the reaction is balanced)

Lithium undergoes a combustion reaction by reacting with oxygen in the air. Show all the steps for the ionic bond that forms between Lithium and oxygen. Which of the following is true? (Select all that apply)

Lithium undergoes a combustion reaction by reacting with oxygen in the air. What ions will Li and O form?

Lithium undergoes a combustion reaction by reacting with oxygen in the air. Based on the cation and anion formed from the question above, determine the chemical formula and chemical name of the product that forms.

Iodine and chlorine are both nonmetals and halogens located in group 17 on the periodic table. Iodine is less reactive than chlorine. Which BEST explains why?

Use the law of conservation of mass to explain how you figured out in question 1.

Law of conservation of mass- Matter cannot be created nor destroyed

Total Mass of reactants = Total Mass of Products

In the metal reactivity lab, magnesium metal reacted with hydrochloridc acid to form hydrogen gas and magnesium chloride. The reaction is shown below.

___HCl (aq) + _Mg (s) --> _H2 (g) + ___MgCl2 (aq)

What are the coefficients for the balanced equation?

What are the correct coefficients in order to balance the chemical reaction below:

K + S --> K2S

Which is the correct balanced chemical reaction for when Hydrogen (H) and Phosphorous (P) react? (Hint: Determine the + and - ions that will form for the prodcut 1st and then check to see that the reaction
is balanced)