Chemical Reactions unit test review - CMS - Ms. Counts
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| If glycerin has a higher density than water, will it sink or float? | Sink
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| If ammonia has a lower density than water, will it sink or float? | Float
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| Substances were combined in beakers. In beaker 1 there was no color change, no solid formed, & there are no bubbles. In beaker 2 there was a color change, a solid formed, bubbles formed, & a gas produced. Which beaker shows a chemical reaction? | Beaker 2
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| If zinc and sulfur are combined to form zinc sulfide and a color change happened, is this an indication that a chemical reaction was formed? | Yes
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| Students at a bonfire noticed a large amount of gas and ash were produced as logs of wood burn. How can you explain what type of reaction this is? | This is a chemical reaction because the atoms in the wood react with oxygen and rearrange to form new combinations of atoms and molecules
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| Matter can change its form but ___________ | the mass must stay the same
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| Which compounds represent products in this equation: HCl + ClO -> 2Cl + OH | 2Cl and OH
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| Is iron rusting a chemical or physical change? | chemical change
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| Is water boiling a chemical or physical change? | physical change
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| Is sugar dissolving a chemical or physical change? | physical change
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| Is eggs cooking a chemical or physical change? | chemical change
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| Is the following equation balanced or unbalanced? 4P + 3Br -> 2PBr | Unbalanced
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| Is the following equation balanced or unbalanced? 2H + 2Cl -> 2HCl | Balanced
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| What law states that atoms cannot be created or destroyed, only rearranged | Law of conservation of mass
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| What are the tiny particles that make up matter? | atoms
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| What is a common sign that a chemical change has occurred? | A color change
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| What are the 3 states of matter? | solid, liquid, gas
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| How many total atoms are in the reactants? 2H + 2Cl -> 2HCl | 4
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| How many total atoms are in the products? HCl + ClO -> 2Cl + OH | 3
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| For a chemical reaction in a closed system, mass cannot be _______ or ________. We can say that throughout the reaction mass is _____________. | created; destroyed; conserved
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| What is a characteristic of a substance that doesn't change? | Property
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| Small golden flakes are removed from a water solution by filtering the solution. Is this a physical or chemical change? | Physical
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| Lacie dropped an ice cube in her coffee and the ice cube melted. Which way does the energy transfer between the ice cube and the coffee? | Heat from the coffee transferred into the coffee, melting the ice
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| If you don't touch a marshmallow to a campfire flame, the marshmallow can still be roasted. Why does this happen? | Heat radiates from the fire and cooks the marshmallow
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| Wood and oxygen are commonly burned at campfires, and all that's leftover is ash and char. Would the mass increase, decrease, or remain the same? | the total mass of the reaction stays the same, but mass leaves the wood as smoke
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| The original substances in a chemical reaction are called _______________ and the new substances created are called _________________ | Reactants; products
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| What is the process that produces chemical change, resulting in new substances that have properties different from those of the original substance? | Chemical reaction
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| Rob set up the following experiment: He dropped identical blue bath bombs into a 100 mL of cold water & 100 mL of hot water, put an identical thermometer in each, observed them for 10 min & took observations every 2 min. What is his independent variable? | Temperature of the water
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| Rob set up the following experiment: He dropped identical blue bath bombs into a 100 mL of cold water & 100 mL of hot water, put an identical thermometer in each, observed them for 10 min & took observations every 2 min. What is his dependent variable? | How long the bath bomb takes to dissolve
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| Rob set up the following experiment: He dropped identical blue bath bombs into a 100 mL of cold water & 100 mL of hot water, put an identical thermometer in each, observed them for 10 min & took observations every 2 min. What are his control variables? | 100 mL of water, identical thermometers, and recording the observations every 2 minutes
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