Potassium and nickel are in the same row of the periodic table. What do these elements have in common?(1 point)
Responses
They have the same number of valence electrons.
They have the same number of valence electrons.
They have similar reactivity.
They have similar reactivity.
They have the same number of electron shells.
They have the same number of electron shells.
They have similar physical properties.
They all have the same number of electrons in the outer shell.
baking a cake
Why do elements that are in the same group of the periodic table share similar properties?(1 point)
Responses
They all have the same number of electrons in the outer shell.
They all have the same number of electrons in the outer shell.
They are all metals.
They are all metals.
They are all very reactive with other elements.
They are all very reactive with other elements.
They all have the same atomic mass
Which option is an example of a chemical change?(1 point)
Responses
boiling water
boiling water
slicing an apple
slicing an apple
baking a cake
baking a cake
ripping paper
A scientist is using a lithium ion battery to power her laptop. Which statement about the battery is correct?(1 point)
Responses
Electrons are lost to the environment when the battery is used.
Electrons are lost to the environment when the battery is used.
Lithium atoms are created as the battery recharges.
Lithium atoms are created as the battery recharges.
The mass of the battery increases when it is recharged.
The mass of the battery increases when it is recharged.
A new substance is formed as the battery is used
Use the chemical reaction to answer the question.
2H2O2→2H2O +O2
Which statement about the reaction is correct?
(1 point)
Responses
The reaction creates new atoms of H2O and O2.
The reaction creates new atoms of H 2 O and O 2 .
Atoms of H2 and O2 are lost during the reaction.
Atoms of H 2 and O 2 are lost during the reaction.
The H2O and O2 produced have the same mass as the original H2O2.
The H 2 O and O 2 produced have the same mass as the original H 2 O 2 .
H2O2 has the same properties as H2O and O2.