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Measures 9 skills from
Measures 9 skills from
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55 questions
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- Q1What does it mean by identifying variables in a scientific experiment?Identifying factors that can change and affect the experiment's outcomesDeciding what tools to use for the experimentChoosing the topic of the experimentPicking the most interesting parts of the experiment30sSC.8.N.1.1
- Q2What are the basic types of variables in a scientific experiment?Past, Present, and FutureIndependent, Dependent, and ControlledInput, Output, and StoragePositive, Negative, and Neutral30sSC.8.N.1.1
- Q3What does a scientific investigation usually involve?Ignoring all evidence that doesn't support the initial hypothesisCollection of relevant empirical evidence, use of logical reasoning, and imagination in devising hypothesesUsing only one's imagination to devise outcomesGuessing possible outcomes without evidence30sSC.8.N.1.6
- Q4What happens to a chemical reaction when the temperature is increased?The reaction rate increasesThe reaction stopsThe reaction does not changeThe reaction rate decreases30sSC.8.P.9.3
- Q5In some chemical changes, cooling the reaction mixture can lead to what result?Speed up the reactionInitiate combustionSlow down the reactionChange the color of the mixture30sSC.8.P.9.3
- Q6Why does an increase in temperature typically speed up a chemical reaction?It reduces the number of particlesIt provides the particles with more energyIt makes particles less reactiveIt decreases the size of particles30sSC.8.P.9.3
- Q7What is the key difference between a physical change and a chemical change?A physical change involves changes in the form of a substance, while a chemical change involves changes in the chemical properties.A chemical change can be reversed, but a physical change cannotA physical change can be reversed, but a chemical change cannotA physical change involves changes in the chemical properties, while a chemical change involves changes in the form of a substance30sSC.8.P.9.2
- Q8During science class, you notice that an ice cube slowly starts to melt. What type of change is this?Physical ChangeChemical ChangeBoth Physical and Chemical ChangeNeither Physical nor Chemical Change30sSC.8.P.9.2
- Q9Which of the following is a chemical change?Boiling of waterDissolving sugar in waterBurning of woodMelting of ice30sSC.8.P.9.2
- Q10What is an example of a physical change?Rusting ironBurning gasolineRipping a piece of paperBaking a cake30sSC.8.P.9.2
- Q11In a chemical experiment, 20 grams of substance A reacted with 30 grams of substance B. If the Law of Conservation of Mass applies, how many grams of resultant substance should be produced?60 grams70 grams50 grams40 grams30sSC.8.P.9.1
- Q12If a block of ice melts into water, will the mass stay the same, increase, or decrease according to the Law of Conservation of Mass?IncreaseStay the sameDecreaseNone of the above30sSC.8.P.9.1
- Q13According to the Law of Conservation of Mass, when a chemical reaction takes place, what happens to the total mass of the reactants and the products?The total mass remains constantThe total mass increasesThe total mass decreasesThe total mass disappears30sSC.8.P.9.1
- Q14A piece of wood that weighs 50g is burned and turns into ash and smoke. If the ash weighs 30g, how much does the smoke weigh according to the law of conservation of mass?50g20g10g30g30sSC.8.P.9.1
- Q15In a closed system, what is the result of the mass before and after a physical change according to the Law of Conservation of Mass?The mass disappearsThe mass increasesThey are equalThey are different30sSC.8.P.9.1