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7:Chemical Reactions
Chemical Reactions unit test review - CMS - Ms. Counts
| Question | Answer |
|---|---|
| If glycerin has a higher density than water, will it sink or float? | Sink |
| If ammonia has a lower density than water, will it sink or float? | Float |
| 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 |
| 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 |
| 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 |
| Matter can change its form but ___________ | the mass must stay the same |
| Which compounds represent products in this equation: HCl + ClO -> 2Cl + OH | 2Cl and OH |
| Is iron rusting a chemical or physical change? | chemical change |
| Is water boiling a chemical or physical change? | physical change |
| Is sugar dissolving a chemical or physical change? | physical change |
| Is eggs cooking a chemical or physical change? | chemical change |
| Is the following equation balanced or unbalanced? 4P + 3Br -> 2PBr | Unbalanced |
| Is the following equation balanced or unbalanced? 2H + 2Cl -> 2HCl | Balanced |
| What law states that atoms cannot be created or destroyed, only rearranged | Law of conservation of mass |
| What are the tiny particles that make up matter? | atoms |
| What is a common sign that a chemical change has occurred? | A color change |
| What are the 3 states of matter? | solid, liquid, gas |
| How many total atoms are in the reactants? 2H + 2Cl -> 2HCl | 4 |
| How many total atoms are in the products? HCl + ClO -> 2Cl + OH | 3 |
| For a chemical reaction in a closed system, mass cannot be _______ or ________. We can say that throughout the reaction mass is _____________. | created; destroyed; conserved |
| What is a characteristic of a substance that doesn't change? | Property |
| Small golden flakes are removed from a water solution by filtering the solution. Is this a physical or chemical change? | Physical |
| 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 |
| 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 |
| 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 |
| The original substances in a chemical reaction are called _______________ and the new substances created are called _________________ | Reactants; products |
| What is the process that produces chemical change, resulting in new substances that have properties different from those of the original substance? | Chemical reaction |
| 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 |
| 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 |
| 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 |
Created by:
HaleyCounts
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