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- 1. Multiple Choice
Which of the following models best demonstrates a balanced chemical equation?FGHJ - 2. Multiple ChoiceThe formula below represents the most common carbohydrate known as glucose. Which information can be determined from the chemical formula?
C6H12O6The structural arrangement of the atoms in a glucose moleculeThe color of a glucose moleculeThe size of a glucose moleculeThe number of atoms of each element in a glucose molecule - 3. Multiple Choice
For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes. The metal turned black and there were bubbles.
The student inferred that a chemical reaction occurred. What evidence supports this inference?
A dark solid formed on the zinc metal and a gas was released
The zinc metal remained silver-colored and shiny
The CuSO4 solution turned blue when the zinc metal was added.
None of these
- 4. Multiple ChoiceThe reactants are on the left side of the chemical equation.TrueFalse
- 5. Multiple ChoiceIn which of these compounds are there twice as many oxygen atoms as hydrogen atoms?H3PO4H2SO4HCIO3H20
- 6. Multiple Choice
Coal contains carbon and other elements. During a combustion reaction, Carbon Dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
The shape of the coal changes
Oxygen is present
A new substance is produced
Coal is made up of more than one element
- 7. Multiple Choice
In a ___________change, a substance changes into a different substance.
Physical
Chemical
- 8. Multiple Choice
The Law of Conservation of Mass states
that matter exists in all states and reacts the same
that matter can only be changed into new substances by introducing a catalyst
that matter exists in the same state throughout any chemical change
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
- 9. Multiple Choice
How many Al atoms are in this compound? 4Al2O3
3
8
6
4
- 10. Multiple Choice
a copper penny turning greenish after a few years. Is this a physical or chemical change?
Physical change
Chemical change
- 11. Multiple Choice
Which of the following IS a physical change?
chopping a log in half with an axe
a nail rusting
baking cookies
making sour cream from milk and lemon juice
- 12. Multiple ChoiceWhich of the following is NOT an example of a chemical reaction?Wood BurningA cake baking in an ovenMelting Ice CreamMixing Vinegar and Baking Soda
- 13. Multiple Choice
A chemical reaction is a process in which one or more substances change into another substance which are different from the original substance.
TRUE
FALSE
- 14. Multiple Choice
What are substances on the right side of a chemical equation called?
electrons
groups
products
reactants
- 15. Multiple Choice
What does the number in front of the molecular symbols mean?
2CO (CO is the chemical formula for carbon monoxide)
It shows that there is only one molecule present in a reaction
It shows the number of molecules present
It shows the number of reactions that took place
All of the choices
- 16. Multiple Choice
Can the subscripts in a chemical reaction be changed? Example: H2O
Cannot be determined
Maybe, depending on the energy released
No, they define the molecules in the reaction
Yes, to balance the equation
- 17. Multiple ChoiceHow many atoms of carbon (C) are in C6H12O6?361224
- 18. Multiple ChoiceWhat are the products in the following chemical equation?
2H2 + O2 --> 2H2OH2O22H2 + O22H2O - 19. Multiple Choice
How many atoms of aluminum are on each side of the following equation:
4Al + 3O2 --> 2Al2 O3
2
6
1
4
- 20. Multiple ChoiceIs the following equation balanced or unbalanced?
Fe + S --> FeSbalancedunbalanced - 21. Multiple Choice
What does the arrow in a chemical equation mean...
H2 + O --> H2O
Reactants
Products
Yields
Chemical Equation
- 22. Multiple ChoiceIdentify the reactant(s) and product(s) of the reaction.All three are reactants and none are products.Hydrogen and water are the reactants, and oxygen is the product.Water and oxygen are the reactants, and hydrogen is the product.Hydrogen and oxygen are the reactants, and water is the product.
- 23. Multiple Choice
Speeds up the rate of a reaction
catalyst
endothermic
exothermic
chemical
- 24. Multiple ChoiceWhat is the name for the solid formed during a reaction?PrecipitateGasCompoundAqueous
- 25. Multiple ChoiceWhat is the right part of a chemical equation called?
H2 + O → H2OReactantsProductsYieldsChemical Equation - 26. Multiple Choice
The amount of matter in a substance is called its
mass
weight
volume
density
- 27. Multiple Choice
water is made up of (H2O)
2 hydrogen and 1 oxygen
4 hydrogen and 3 oxygen
2 hydrogen and 2 oxygen
2 helium and 1 sulfur
- 28. Multiple Choice
The atomic mass of an element consists of the mass of it's
neutrons
electrons and neutrons
neutrons and protons
electrons and protons
- 29. Multiple Choice
Which equation shows conservation of mass?
H2 + O2 → 2H2O
H2 + O2 → H2O
H2 + Cl2 → 2HCl
H2 + Cl2 → HCl
- 30. Multiple Choice
If a chemical equation is balanced properly, both sides of the equation must have the same number of
atoms
coefficients
subscripts
molecules
- 31. Multiple Choice
Which of the following cannot be broken down by chemical change?
Water (H2O)
Aluminum Oxide (Al2O3)
Carbon Dioxide (CO2)
Calcium (Ca)
- 32. Multiple Choice
Which statement about combustion is true?
Combustion is a chemical change in which energy is released.
Combustion is a physical change in which energy is absorbed.
Combustion is a chemical change in which energy is absorbed.
Combustion is a physical change in which energy is released.
- 33. Multiple Choice
Which substance cannot be broken down into simpler substances?
air
a mixture
an element
a compound
- 34. Multiple Choice
Is the following reaction balanced?
2H2 + O2 --> H2O
yes it is balanced
no it is not balanced
you can not tell by the equation
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