Ukuran huruf
Lembar kerja4.4 Elements in Group 1 (a)
Total soal: 26
Worksheet time: 13mins
Atom T has a proton number of 11 and a nucleon number of 23. Which of the following is true about element T?
It does not conduct electricity
If forms an oxide with the formula TO
It is a hard black solid
It reacts with water to form an alkaline solution
Table shows the relative atomic masses of two elements, H and J. Element H and J are located in Group 1 of the Periodic Table. Which statements is true about elements H and J?
H is more electropositive than J
The melting point of J is higher than that of H
The number of valence electrons in atom J is more than that of atom H
J reacts with cold water more vigorously than H
Which statements is correct about the alkali metals when going down Group 1 in the Periodic Table?
The reactivity decreases
Strength of nucleus to attract an electron into the valence shell increases
Electropositivity decreases
The single valence electron becomes more weakly pulled by the nucleus
Group 1 elements are also known as
Noble gas
Halogen
Alkaline earth metals
Alkali metals
Arrange the elements in group 1 from the top to bottom of the group.
Li, Na, K, Fr, Rb, Cs
Li, Na, K, Rb, Fr, Cs
Li, Na, K, Rb, Cs, Fr
Fr, Cs, Rb, K, Na, Li
Group 1 elements only form ….. Ion
1+
1-
2+
2-
What gas is given off when group 1 elements reacts with water?
Hydrogen
Oxygen
Carbon dioxide
Helium
When a group 1 element reacts with water, a hydroxide is formed. What colour would Universal Indicator turn in this solution?
Green
Blue
Yellow
Red
How many electrons are in the outer shell of group 1 elements?
0
1
2
3
Why does the reactivity of group 1 elements increases down the group?
It becomes more reactive
It becomes easier to accept an electron
It becomes easier to lose an electron
It becomes less reactive
What is the factor that determines the chemical properties of an element?
The number of electron shells
The number of electrons in the innermost shell
The number of electrons in the outermost shell
The number of neutrons in the nucleus
The Group 1 elements are all very ____________.
reactive
unreactive
Select the properties of the Group 1 elements.
Silvery solids
Very hard metals
Very soft metals
High density
Low density
The reactivity of the Group 1 elements ______________ as you go down the group.
decreases
increases
does not change
Sodium is less reactive than which Group 1 elements?
Lithium
Potassium
Rubidium
Caesium
The melting and boiling points of the Group 1 elements ______________ as you go down the group.
decrease
increase
do not change
Balance the symbol equation.
2K + H2O → (a) KOH + H2
Lithium is reacted with chlorine gas. What is produced in this reaction?
(a)
Balance the equation for the reaction between sodium and oxygen.
(a) Na + O2 → 2Na2O
Select two correct answers. Going the down Group 1,
Reactivity increases
Atomic size decreases
Electropositivity increases
Density decreases
Explain why reactivity increases going down Group 1.
Atomic size increased, and the force of attraction between nucleus and valence electron increased.
Atomic size decreased, and the force of attraction between nucleus and valence electron decreased.
Atomic size increased, and the force of attraction between nucleus and valence electron decreased.
Atomic size decreased, and the force of attraction between nucleus and valence electron increased.
Explain why melting and boiling point decreases, going down Group 1.
Metallic bond between atoms becomes weaker, energy required to overcome metallic bond decreased.
Metallic bond between atoms becomes stronger, energy required to overcome metallic bond increased
Metallic bond between atoms becomes stronger, energy required to overcome metallic bond decreased.
Metallic bond between atoms becomes weaker, energy required to overcome metallic bond increased.
What is the definition of electropositivity?
Tendency of atom to gain electrons, and form positive ion in chemical reactions.
Tendency of atom to lose electrons, and form negative ion in chemical reactions.
Tendency of atom to gain electrons, and form negative ion in chemical reactions.
Tendency of atom to lose electrons, and form positive ions in chemical reactions.
Explain why electropositivity decreases, going down Group 1.
Atomic size increased, Force of attraction between nucleus and valence electron increased. Electrons are harder to lose.
Atomic size increased, Force of attraction between nucleus and valence electron decreased. Electrons are easier to lose.
Atomic size decreased, Force of attraction between nucleus and valence electron increased. Electrons are harder to lose.
Atomic size decreased, Force of attraction between nucleus and valence electron decreased. Electrons are easier to lose.
what can be observed, when lithium is reacted with water?
Metal moves fast on surface of water, and red flame is produced.
Metal moves slowly on surface of water, and purple flame is produced.
Metal moves slowly on surface of water, and red flame is produced.
Metal moves fast on surface of water, and purple flame is produced.
What can be observed when potassium is reacted with oxygen and chlorine gas?
Burns slowly and produce yellow flame
Burns very brightly and produce purple flame
Burns very brightly and produce yellow flame
Burns slowly and produce purple flame
