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what are the answers for Matter Interactions Unit Test unit 3 lesson 16
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connexus helicoper
idk
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bubbly queen
Matter Interactions Unit Test
4 of 164 of 16 Items
Question
What will make an atom without an electrical charge? (1 poi
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Bot
Answer: An atom without an electrical charge is called a neutral atom, which means it has an equal number of protons and electrons.
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bubbly queen
What will make an atom without an electrical charge? (1 point)
Responses
More electrons than protons, because electrons are negatively charged and protons are positively charged, and electrons are much smaller than protons
More electrons than protons, because electrons are negatively charged and protons are positively charged, and electrons are much smaller than protons
An equal number of protons and electrons, because electrons are positively charged and protons are negatively charged.
An equal number of protons and electrons, because electrons are positively charged and protons are negatively charged.
An equal number of neutrons and electrons, because neutrons are positively charged and electrons are negatively charged.
An equal number of neutrons and electrons, because neutrons are positively charged and electrons are negatively charged.
An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged.
An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged.
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Responses
More electrons than protons, because electrons are negatively charged and protons are positively charged, and electrons are much smaller than protons
More electrons than protons, because electrons are negatively charged and protons are positively charged, and electrons are much smaller than protons
An equal number of protons and electrons, because electrons are positively charged and protons are negatively charged.
An equal number of protons and electrons, because electrons are positively charged and protons are negatively charged.
An equal number of neutrons and electrons, because neutrons are positively charged and electrons are negatively charged.
An equal number of neutrons and electrons, because neutrons are positively charged and electrons are negatively charged.
An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged.
An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged.
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Bot
Correction:
An equal number of protons and electrons will make an atom without an electrical charge.
An equal number of protons and electrons will make an atom without an electrical charge.
Answered by
bubbly queen
Thts not an answer
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Bot
My apologies. The correct answer is - "An equal number of protons and electrons will make an atom without an electrical charge."
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bubbly queen
Thats not and option
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Bot
My apologies for the confusion. The correct option is:
"An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged."
"An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged."
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bubbly queen
If a substance is made of a single element, it is(1 point)\
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Bot
Answer: Homogeneous, pure and an element.
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bubbly queen
If a substance is made of a single element, it is(1 point)
Responses
made of one type of atom.
made of one type of atom.
made of multiple types of atoms that have chemically bonded together.
made of multiple types of atoms that have chemically bonded together.
made through chemical reactions.
made through chemical reactions.
made of one atom.
Responses
made of one type of atom.
made of one type of atom.
made of multiple types of atoms that have chemically bonded together.
made of multiple types of atoms that have chemically bonded together.
made through chemical reactions.
made through chemical reactions.
made of one atom.
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Bot
The answer is: "Made of one type of atom."
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bubbly queen
Which element has the same number of valence electrons as bromine (Br)?
(1 point)
Responses
potassium (K)
potassium (K)
selenium (Se)
selenium (Se)
chlorine (Cl)
chlorine (Cl)
krypton (Kr
(1 point)
Responses
potassium (K)
potassium (K)
selenium (Se)
selenium (Se)
chlorine (Cl)
chlorine (Cl)
krypton (Kr
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Bot
The answer is: Chlorine (Cl)
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bubbly queen
Why are sodium (Na) and potassium (K) in the same group on the periodic table?(1 point)
Responses
They are both hard and brittle.
They are both hard and brittle.
They have similar atomic weights.
They have similar atomic weights.
They have similar reactivity.
They have similar reactivity.
They are both colorless.
They are both colorless.
Responses
They are both hard and brittle.
They are both hard and brittle.
They have similar atomic weights.
They have similar atomic weights.
They have similar reactivity.
They have similar reactivity.
They are both colorless.
They are both colorless.
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Bot
The answer is: "They have similar reactivity."
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bubbly queen
A student cuts some fabric into two pieces. Is this change physical or chemical?(1 point)
Responses
It is a physical change because there is no reaction.
It is a physical change because there is no reaction.
It is a physical change because the process is reversible.
It is a physical change because the process is reversible.
It is a chemical change because the size changes.
It is a chemical change because the size changes.
It is a chemical change because there is no phase change
Responses
It is a physical change because there is no reaction.
It is a physical change because there is no reaction.
It is a physical change because the process is reversible.
It is a physical change because the process is reversible.
It is a chemical change because the size changes.
It is a chemical change because the size changes.
It is a chemical change because there is no phase change
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Bot
The answer is: "It is a physical change because there is no reaction."
Answered by
bubbly queen
Matter Interactions Unit Test
11 of 1611 of 16 Items
Question
Which procedure could be used to demonstrate that matter is conserved during a physical change?(1 point)
Responses
Find the mass of a raw egg. Cook the egg. Find the mass of the cooked egg.
Find the mass of a raw egg. Cook the egg. Find the mass of the cooked egg.
Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
Find the mass of an apple. Cut the apple and remove the core. Find the mass of the remaining apple.
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Bot
The procedure that could be used to demonstrate that matter is conserved during a physical change is:
Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
Answered by
bubbly queen
Matter Interactions Unit Test
12 of 1612 of 16 Items
Question
One molecule of bromine (Br2) and two molecules of potassium chloride (KCl) combine in a reaction. How many atoms are in the products?(1 point)
Responses
six
six
four
four
two
two
three
three
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Bot
The correct answer is: Four.
One molecule of Br2 contains two atoms of bromine (Br) while two molecules of KCl contain two atoms of potassium (K) and two atoms of chlorine (Cl). Thus, the products contain four atoms.
One molecule of Br2 contains two atoms of bromine (Br) while two molecules of KCl contain two atoms of potassium (K) and two atoms of chlorine (Cl). Thus, the products contain four atoms.
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bubbly queen
2Cu+S→Cu2S
Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction, all of the copper and all of the sulfur react. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide.
(2 points)
Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction, all of the copper and all of the sulfur react. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide.
(2 points)
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Bot
The scientist used the law of conservation of mass to predict that the product of the reaction would be 15.9 grams of copper sulfide. According to this law, the total mass of reactants must be equal to the total mass of products in a chemical reaction. Therefore, the sum of the masses of copper and sulfur must be equal to the mass of copper sulfide formed.
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bubbly queen
In 3–5 sentences, describe what happens during a chemical reaction, using the terms reactant, product, and bond. (4 points)
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During a chemical reaction, reactants undergo a series of chemical changes to form new substances called products. The reactants contain chemical bonds that hold the atoms together. During the reaction, some of these bonds are broken, and new bonds are formed to create the products. The properties of the products are different from the reactants, and the amount of matter is conserved in the reaction according to the law of conservation of mass.