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- 1. Multiple Choice
ElementCompoundMixture - 2. Multiple ChoiceElementCompoundMixture
- 3. Multiple ChoiceThis diagram represents a _____.pure substance that is a compoundmixture of elementspure substance that is an elementmixture of compounds
- 4. Multiple Choice
What type of change is this?
Chemical
Melting
Evaporation
Condensation
Sublimation
- 5. Multiple Choice
Mixture or Pure Substance?
Mixture
Pure Substance
- 6. Multiple ChoiceIf reaction starts with 20g of reactants it should producea total of 40g of productsa total of 10g of productsa total of 80 g of productsa total of 20g of products
- 7. Multiple Choice
Which of the models of a chemical reaction best represents the Law of Conservation of Mass?
A
B
C
D
- 8. Multiple Choice
A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?
The heat caused the chemical to become less dense.
The reaction gave off more heat than was added.
Some of the lighter particles were destroyed.
Some of the particles escaped as a gas formed.
- 9. Multiple Choice
A student measures the mass of an iron nail to be 25 grams. The student heats the nail over a bunsen burner and measures the mass of the nail afterwards. The mass of the nail is found to be greater after burning. Which of the following best explains the increase in mass of the nail?
The heat caused the compound to become more dense.
The reaction gave off less heat than was added.
Some of the heavier particles multiplied inside the nail.
Extra particles from the air were added to the nail during burning.
- 10. Multiple Choice
Frying an egg is an example of
exothermic reaction
endothermic reaction
both
none
- 11. Multiple ChoiceIn an endothermic reaction the system is releasing energy.TrueFalse
- 12. Multiple ChoiceDuring an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.WarmCold
- 13. Multiple Choice
1. Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the most exothermic?
- 14. Multiple Choice
endothermic
exothermic
- 15. Multiple Choice
endothermic reaction
exothermic reaction
- 16. Multiple ChoiceWhich of the following is not a chemical property?rustingboilingrottingburning
- 17. Multiple ChoiceWhich one of these is a chemical property?melting pointboiling pointcolorflammability
- 18. Multiple ChoiceWhich is an example of a physical property?ability to react with acidstate of matterflammabilityability to react with oxygen
- 19. Multiple ChoiceAbility to rust is this type of property:Physical propertyChemical property
- 20. Multiple ChoiceProperties that can be observed without trying to change the identity of the substance.PhysicalChemical
- 21. Multiple ChoiceSalt dissolves in waterphysical Changechemical change
- 22. Multiple ChoiceWhich is a chemical change?freezing fruit juiceslicing a potatoboiling watercopper metal turning green
- 23. Multiple Choicewhat is the definition of physical change?any change that results in the formation of new chemical substances.rusting
changes affecting the form of a chemical substance, but not its chemical identity.
any property that is measurable, whose value describes a state of a physical system - 24. Multiple Choice
What is a chemical change?
How two chemicals react with one another when combined
A property that we can measure or observe with our 5 senses or other tools
When two chemicals react with one another to form a new substance
When a change occurs but it does not result in the formation of a new substance
- 25. Multiple Choice
A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?
The powder DISSOLVED in the water
The water turned the COLOR yellow
The water's TEMPERATURE changed
The STATE OF MATTER changed
- 26. Multiple Choice
When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?
Physical change: state of matter
Chemical change: precipitate
Physical change: freezing
Chemical change: new gas
- 27. Multiple Choice
You mix a yellow powder and a clear liquid. The liquid turns light yellow and the powder seems to disappear. This is a...
Endothermic Chemical Change
Exothermic Chemical Change
Physical Change
- 28. Multiple Choice
When writing a chemical equation, reactants are on the _____________ while products are on the _________________.
top, bottom
right, left
left, right
bottom, top
- 29. Multiple Choice
The law of conservation of mass states
chemical reactions create new atoms
atoms cannot be created or destroyed
reactants vanish once a reaction takes place
products appear when a reaction takes place
- 30. Multiple Choice
How many Potassium (K) atom are there?
1
2
3
4
- 31. Multiple Choice
How many Iron (Fe) and Oxygen (O) are there?
Fe = 1, O = 2
Fe = 2, O = 3
Fe = 2, O = 1
Fe = 1, O = 3
- 32. Multiple Choice
How many molecules are there?
3
6
12
18
- 33. Multiple Choice
How many Hydrogen (H) and how many Chlorine (Cl) are there?
H = 4, Cl = 1
H = 4, Cl = 0
H = 4, Cl = 3
H = 4, Cl = 4
- 34. Multiple Choice
Identify the Reactants in this equation.
A
B
- 35. Multiple Choice
Is the compound in the pink box a Reactant or a Product?
Reactant
Product
- Answer choicesTagsAnswer choicesTags