Just checking my answers..
1. Which is not a characteristic of the Group 1 alkali metals?
A. high densities
B. low melting points***
C. found in batteries
D. silvery solid
2. Which of the following is true of the Group 2 alkali earth metals?
A. They are less dense than the Group 1 alkali metals
B.They have a lower melting point than Group 1
C.They are reactive, but not as reactive as the alkali metals***
D. Lithium and sodium are members of this group
3. Elements in Groups 13–18 are unique because
A. a single group can have members that are solids, liquids, and gases
B. a single group can contain metals, nonmetals, and metalloids
C. neither a or b
D. both a and b***
1 a
2 c
3 d
100% Thanks.
Your answers are correct:
1. B. low melting points - This is the correct option. Group 1 alkali metals have low melting points.
2. C. They are reactive, but not as reactive as the alkali metals - This is the correct option. Group 2 alkali earth metals are less reactive compared to the alkali metals.
3. D. both a and b - This is the correct option. Elements in Groups 13-18 can have members that are solids, liquids, and gases, and they can also contain metals, nonmetals, and metalloids.
To check your answers for the questions:
1. Which is not a characteristic of the Group 1 alkali metals?
To determine the correct answer, you need to know the characteristics of Group 1 alkali metals. The characteristics of Group 1 alkali metals include: high reactivity, low densities, low melting points, silvery solids, and they are found in batteries. From these characteristics, you can identify the characteristic that is NOT associated with Group 1 alkali metals.
The correct answer is B. low melting points. (This is contrary to their actual characteristic, as they have high melting points.)
2. Which of the following is true of the Group 2 alkali earth metals?
To find the correct answer, you need to know the properties and characteristics of Group 2 alkali earth metals. Group 2 alkali earth metals have the following properties: higher densities compared to Group 1 alkali metals, higher melting points compared to Group 1, they are less reactive compared to Group 1 alkali metals, and two members of this group are lithium and sodium. From these properties, you can identify the option that correctly describes Group 2 alkali earth metals.
The correct answer is C. They are reactive, but not as reactive as the alkali metals. (This aligns with their property of being less reactive compared to Group 1 alkali metals.)
3. Elements in Groups 13–18 are unique because
To determine the answer, you need to know the unique characteristics of Groups 13–18. Group 13–18 elements have the ability to exist in different states of matter (solids, liquids, and gases) within the same group, and they can contain a combination of metals, nonmetals, and metalloids. The correct answer must reflect these unique features.
The correct answer is D. both a and b. (This option recognizes that a single group can have members that are solids, liquids, and gases, as well as contain metals, nonmetals, and metalloids.)