Here are the correct answers for each question:
Question 1: a chemical reaction in which electrons are transferred between reactants
Question 2: BeF2
Question 3: decomposition
Question 4: bromine (Br)
Question 5: carbon dioxide and water
Question 1
A)Which statement best describes an oxidation-reduction reaction?(1 point)
Responses
a chemical reaction in which electrons are transferred between reactants
a chemical reaction in which electrons are transferred between reactants
a chemical reaction that involves oxygen
a chemical reaction that involves oxygen
a chemical reaction in which there are fewer products than reactants
a chemical reaction in which there are fewer products than reactants
a chemical reaction in which electrons are released from the system
a chemical reaction in which electrons are released from the system
Question 2
A)Beryllium (Be) has four electrons. Fluorine (F) has nine electrons. Which chemical formula shows the correct subscripts for the product of the reaction when beryllium and fluorine combine?(1 point)
Responses
BeF
BeF
Be2F
Be 2 F
Be2F2
Be 2 F 2
BeF2
BeF 2
Question 3
A)
Use the reaction to answer the question.
2KCl → 2K + Cl2
Which type of reaction is shown?
(1 point)
Responses
combustion
combustion
displacement
displacement
combination
combination
decomposition
decomposition
Question 4
A)
Use the periodic table to answer the question.
An illustration shows the periodic table of elements with elements arranged in increasing order of atomic number in 18 columns (groups) and 7 rows (periods). The electronegativity of elements increases from left to right, across a period. The hydrogen on the left is included in group with medium electronegativity. Also, fluorine is shown as element with highest electronegativity.
Which element is most likely to replace hydrogen in a displacement reaction?
(1 point)
Responses
bromine (Br)
bromine (Br)
helium (He)
helium (He)
oxygen (O)
oxygen (O)
lithium (Li)
lithium (Li)
Question 5
A)A hydrocarbon reacts with oxygen. Which products are the result?(1 point)
Responses
water and hydrogen gas
water and hydrogen gas
carbon dioxide and water
carbon dioxide and water
hydrogen gas and oxygen gas
correct answer only)
1 answer