Rate of reaction

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Identify physical vs chemical changes. Describe methods to investigate the rate of reaction, describe factors affecting rate of reaction

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LIKE XING

Hong Kong

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Rate of reaction


Froggy Jumps Rate of reactionVersión en línea Identify physical vs chemical changes. Describe methods to investigate the rate of reaction, describe factors affecting rate of reaction por LIKE XING 1 What best defines a physical change? a Energy is released only in chemical reactions b A new substance is formed c Substance changes form without creating a new substance 2 Which example is a chemical change? a Ice melting b Water boiling c Iron rusting 3 Dissolving sugar in water is typically a: a Physical change b Nuclear change c Chemical change 4 Which indicates a chemical change may have occurred? a Gas production b Size reduction c Change of shape only 5 Melting ice is an example of a: a Nuclear change b Physical change c Chemical change 6 Photosynthesis in plants is a: a Chemical change b Phase change c Physical change 7 Squeezing a lemon juice is a: a Physical change b Chemical change c Nuclear change 8 Burning paper demonstrates a: a Phase change b Chemical change c Physical change 9 Cutting a piece of metal into smaller pieces is a: a Chemical change b Radioactive decay c Physical change 10 Tarnishing silver (forming silver sulfide) is a: a Chemical change b Physical change c Phase change 11 What best defines a physical change? a A substance is transformed into a different compound b A chemical reaction occurs producing new products c A change in form or state without forming a new substance 12 Which is a chemical change? a Ice melting to water b Iron rusting to form iron oxide c Water boiling into steam 13 Which sign indicates a chemical change during a reaction? a Change in state from solid to liquid b Change in shape without altering composition c Formation of a new substance 14 Which method can be used to investigate rate of reaction? a Measuring color of the solution only at the start b Ignoring mass changes and time measurements c Measuring gas production over time 15 When interpreting a rate experiment graph, what does a steeper slope indicate? a No reaction occurring b A faster rate of reaction c A slower rate of reaction 16 Which factor will increase the rate of a reaction? a Reducing surface area b Lowering concentration c Increasing temperature 17 How is rate of reaction commonly calculated from data? a Rate = total volume × time b Rate = change in product over time c Rate = mass of solvent / time 18 Which factor decreases reaction rate? a Lower concentration of reactants b Adding a catalyst c Increasing surface area 19 Which observation supports a physical change rather than a chemical change? a Paper burns to ash b Bread bakes and forms CO2 c Ice melts to liquid water 20 Why the rate of reaction gradually decreases with time? a Because the temperature decreases b Because the surface area decreases c Because there is insufficient reactants

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Rate of reaction

Froggy Jumps

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Rate of reactionVersión en línea

por LIKE XING

What best defines a physical change?

Which example is a chemical change?

Dissolving sugar in water is typically a:

Which indicates a chemical change may have occurred?

Melting ice is an example of a:

Photosynthesis in plants is a:

Squeezing a lemon juice is a:

Burning paper demonstrates a:

Cutting a piece of metal into smaller pieces is a:

Tarnishing silver (forming silver sulfide) is a:

What best defines a physical change?

Which is a chemical change?

Which sign indicates a chemical change during a reaction?

Which method can be used to investigate rate of reaction?

When interpreting a rate experiment graph, what does a steeper slope indicate?

Which factor will increase the rate of a reaction?

How is rate of reaction commonly calculated from data?

Which factor decreases reaction rate?

Which observation supports a physical change rather than a chemical change?

Why the rate of reaction gradually decreases with time?