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WorksheetsPhysical and Chemical Changes Comp Test
Total questions: 25
Worksheet time: 25mins
Anika, Aria, and Scarlett are in a chemistry class. Their teacher asked them to identify the number of elements in PbNO3. How many elements did they identify?
2
3
4
5
In a science class, Liam, Hannah, and Anika are studying a chemical equation. What does this chemical equation tell them?
It tells them the reactants and the products.
It tells them the elements that make up the reactants and the products.
It tells them the number of atoms that make up the reactants and the products.
All of the above.
Aria, Abigail, and Samuel are conducting a chemistry experiment. They noticed a reaction where 2NaHCO3 transformed into Na2CO3 + CO2 + H2O. Can you help them identify the reactant in this equation?
NaHCO3
Na2CO3
CO2
H2O
James, Liam, and Kai are in a chemistry lab. They are given a few chemical reactions and asked to identify the balanced one. Which of the following reactions is balanced according to them?
Na + Cl2 --> NaCl
H2 + O2 --> H2O
Ca + Br --> CaBr2
Na + F --> NaF
In a chemistry class, Olivia wrote an element's symbol with a number to the lower side. Kai asked Nora, 'What is that number called?' Nora replied, 'It's a '.
Subscript
Superscript
Coefficient
Charge
Evelyn, Arjun, and Samuel conducted a chemical reaction in their science class. Which of the following statements best describes the law of conservation of mass that they observed during their experiment?
In their experiment, atoms were created or destroyed.
In their experiment, atoms were not lost or made.
In their experiment, the mass of the product may be more or less than the reactants.
In their experiment, mass never stays the same.
Aria, Oliver, and Abigail are having a science experiment at school. Aria fills a bowl with 200 g of water. She then puts the bowl of water in the school's freezer, and the water freezes. Which will most likely be the mass of the frozen water?
50 g
100 g
200 g
400 g
Mia, Isla, and Samuel were discussing in their chemistry class. Mia said that melting ice is a physical change and burning wood is a chemical change. Isla asked, 'What is the difference between a chemical change and a physical change?' Can you help them understand?
A chemical change occurs spontaneously, while a physical change requires external energy input.
A chemical change involves a chemical reaction that results in the formation of new substances with different properties, while a physical change only involves a change in the physical properties of a substance.
A chemical change is reversible, while a physical change is irreversible.
A chemical change involves a change in the state of matter, while a physical change involves a change in the chemical composition of a substance.
Aiden, Abigail, and Luna are conducting a science experiment. They are trying to identify the chemical properties of a substance. Which of the following options would be a chemical property they could observe?
odor
flammability
boiling point
conductivity
Ava noticed bubbles forming when Liam was boiling water for tea. Is this evidence of chemical change?
Yes, because the water Ava and Liam are using is changing.
Yes, because the water Liam is boiling is reacting.
No, because the vapor from the water Liam is boiling is still water.
No, because the water Abigail gave to Liam doesn't react with anything.
During a science experiment, Michael, Jackson, and Kai observed various processes. Which of the following processes observed by them is NOT an example of a physical change?
Water freezing in Michael's petri dish
Wood breaking apart in Jackson's hands
Salt dissolving in Kai's beaker of water
Baking soda and vinegar combine and form bubbles in their shared experiment
Liam, Olivia, and Charlotte are working on a science project about metals. They are particularly interested in aluminum. Which of the following statements about aluminum represents a chemical property that they should include in their project?
Aluminum has a density of 2.70 g · cm−3
Aluminum is silvery white in color.
Aluminum is highly reactive.
Aluminum is a soft metal.
Maya, Henry, and Aiden are conducting a chemistry experiment. They are trying to balance a chemical equation. Which of the following models proposed by them best demonstrates a balanced chemical equation?
F
G
H
J
David, Luna, and Aria are studying chemistry together. They come across a molecule of serotonin (pictured) and wonder how many atoms it contains. Can you help them figure out the total number of atoms in a molecule of serotonin?
22
24
25
4
Luna, Arjun, and Aria are conducting a science experiment. They each add 3 H2O molecules to their test tubes. How would you describe what each of them added?
3 H2O molecules
3 H2O atoms
3 H2O elements
3 H2O parts
David, Isla, and Hannah are in a science class. Their teacher explains that when two or more atoms bond together, they form something. What is it that they form?
A molecule
One element
One atom
Solid, Liquid, Gas
Elijah, James, and Nora were conducting a chemistry experiment. They mixed two solutions and observed a solid substance forming. What is the name of this kind of solid substance?
color change
precipitate
acid
chemicals
Henry, David, and Lily were conducting a science experiment in their chemistry class. They were asked to identify if a chemical reaction has occurred. What evidence would they look for?
They would look for a precipitate.
They would look for a color change.
They would look for a temperature change.
All of these answers are evidence.
Evelyn and Harper were conducting a science experiment in their school lab. They observed something that showed -
a new substance has formed
a solid dissolved in a liquid
interaction between 2 gases
a change in the state of matter
Evelyn, Liam, and Samuel are conducting an experiment in their chemistry class. They observe that when an atom gains an electron during their experiment, it becomes
negatively charged
positively charged
neutral
Hannah, Daniel, and Jackson are studying atomic structure during their experiment. They are discussing where valence electrons are used during chemical bonding. According to their discussion, valence electrons are
neutral (no charge)
found in the outer most energy level of the atom
equal to the number of protons
Abigail, Grace, and Sophia are studying chemistry. They come across a sugar molecule with the formula C6H12O6. They want to know how many different elements are in this sugar molecule. What answer would you give them?
3
6
12
24
Evelyn, Lily, and Maya were conducting a chemistry experiment. They noticed that when certain elements combined chemically, the substance no longer looked the same as they did before forming a compound. What change did they observe?
valence electons
energy
properties
group number
Kai, Scarlett, and Benjamin were conducting a chemistry experiment. They combined 2 molecules of water (H2O) and 1 molecule of oxygen (O2) and observed the reaction. They hypothesized that the reaction would produce 4 molecules of magnesium oxide (MgO) and 3 atoms of iron (Fe). Is their hypothesis about the balanced equation correct?
yes
no
Aria, Zoe, and Benjamin were doing a science experiment. They were asked to identify whether H2O, which they use daily for drinking, is an element or a compound. What is your answer?
Element
Compound
