2 Describe that matter is neither created nor destroyed even though it may undergo change.
A. 250 grams, because it is still the same amount of water B. 375 grams, because when water, sugar, and flavoring are mixed the flavoring doesn’t weigh anything C. 380 grams, because water, sugar, and flavoring weigh the same even when dissolved D. 400 grams, because liquids get bigger when they are combined all together A student mixed 125 grams of sugar, 250 grams of water, and 5 grams of flavoring. The solution weighs:
When 20 grams of baking soda is added to 100 grams of vinegar a gas is released and it bubbles into the air. A. The solution has all bubbled away B. The solution weighs less than 120 grams C. The solution weighs exactly 120 grams D. The solution weighs 140 grams Which correctly explains the results of this demonstration?
100 ml of water was poured into a cup, then put into a baggie. It weighed 92 grams. When frozen, it was slightly larger but still weighed 92 grams. After melting it weighed 92 grams. What was her evidence the weight did not change? A. When frozen, it became slightly larger B. When frozen, it changed from a liquid to a solid C. It weighed the same when a liquid as when a solid D. It filled the same size of container whether solid or liquid was A student conducted the following experiment:
What does the solution weigh? A. 100 grams B. 110 grams C. 115 grams D. 120 grams Fifteen grams of vinegar will be added to 100 grams of milk. It thickens slightly.
Which statement is correct? A. A castle built with 125 cubes weighs 625 grams. B. A castle built with 125 cubes will weigh 800 grams C. Using 125 cubes, a tall tower will weigh more than a wide tower D. It is impossible to know the weight because the castle would be too big for the scale A student used 125 sugar cubes to build a castle. Each cube weighed 5 grams.
If the weight of all the blocks is added, what will it total? A. A little less than the weight of the house B. The same weight as the weight of the house C. A little more than the weight of the house D. It would depend on how large the house was A house made of toy blocks is weighed. It is taken apart and each block weighed separately.
Both students used all their clay to make an object. Sarah rolled hers into a ball; Jake made a long, skinny rope. What is the weight of the clay figures now? A. Sarah's weighs more because it is round B. Jake's weighs more because it is long C. There is no way of knowing D. The figures would be equal Sarah and Jake were each given a ball of clay of the same weight.
What has happened to the weight of this flask and balloon in this experiment? A. It has decreased as the water boiled away B. It has stayed the same weight C. It is unpredictable because the balloon is flexible D. It has increased as the balloon expands Water is boiled in a flask with a balloon over the top. As the water heats, the balloon expands.
A day later he takes the ice cube out of the pan and notices it is larger than before. What will it weigh? A. 10 grams B. 11 grams C. 20 grams D. impossible to know Stuart measures 10 grams of water into a pan and then freezes it.
If the solution is heated and the water boiled away, how much salt would you expect to have left in the container? A. 2.5 grams B. 5 grams C. 105 grams D. 500 grams Five grams of salt is dissolved in 100 ml of water to form a saltwater solution.
She stirs it quickly until it makes a ball. It seems smaller now. What do you predict it will weigh? A. Less than the sum of the ingredients, because it is smaller than before B. The same as the sum of the ingredients, even though it has changed shape and size C. More than the sum of the ingredients, because it has become thicker than it was D. It changes from more to less weight each time it is made, so we can't determine how much it will weigh To make Blobbers, Kim mixes 25 ml of glue with 20 ml of water and 20 ml of Sodium Borate Solution
Evaluate evidence that indicates a physical change has occurred.
A. shape B. phase (solid, liquid, gas) C. hardness D. flammability Which of the following is NOT a physical property of matter?
A. It will pour B. It takes the shape of its container C. It cannot be seen easily D. It will hold its shape by itself How do you know when something is a solid?
A. It reacts with oxygen in the air B. It changes to liquid water C. It is hard and white D. It is cold to the touch What evidence shows that ice had a physical change when left out in a room?
Each was tested to see if it floated in water, burned when lit with a flame, or melted when heated. Which substance had a physical change? A. A B. B C. C D. D The following data were collected by testing four substances.
Each was tested to see if it floated in water, burned when lit with a flame, or melted when heated. Which of the tests is not reversible? A. floating in water B. burning when lit C. melting when heated The following data were collected by testing four substances.
When she went back the next day, the soda was all over the freezer and the can was ripped open. Martha wondered if all substances would do the same thing as the soda. How could she design an experiment to find out? A. Pour the same amount of 4 different liquids into ice cube trays. Wait one day and measure sizes. B. Put 1 can of soda in the freezer and 1 can in the refrigerator. Wait two days. C. Put four cans of soda in the freezer and leave overnight. D. Open 1 can of soda and don't open the other. Place both in the freezer and wait a day. Martha wished to cool off a can of soda pop quickly. She put it in the freezer but then forgot it.
A. It has been mixed with food coloring and rubbing alcohol to change color B. It has been burned and is now a pile of ashes C. It has been rolled into paper logs and burned for firewood D. It has been cut into smaller pieces to make note cards Which of these describes paper after it has been through a physical change?
When she went back the next day, the soda was all over the freezer and the can was ripped open. Martha decided that a physical change had occurred when the pop expanded. What evidence supports her? A. The can was stuck to the freezer B. No new substance had formed C. The soda was her last can D. Chemical changes must have two substances Martha wished to cool off a can of soda pop quickly. She put it in the freezer but then forgot it.
Investigate evidence for changes in matter that occur during a chemical reaction.
A. Burning creates food for people B. Modern medicines depend on burning C. Most clean water is created by burning D. Burning fuels supplies light and heat How might reactions with burning be important in your daily life?
How do you know a chemical reaction has taken place? A. A solid and a liquid have been mixed together B. A new substance has formed C. The balloon has stretched and changed shape D. The bottle has not been changed Baking soda and vinegar are mixed in a bottle. A balloon placed over the top fills & expands with gas.
What was needed for this chemical change to take place? A. heat energy had to be added B. heat energy had to be taken away C. a certain amount of time had to pass D. the bread had to be taken out of the wrapper Bread placed in a toaster turns brown then black if left too long.
What evidence shows that a chemical reaction has taken place? A. They are hard to use B. The sun has warmed them C. They are dirty D. They have a new brown/orange crust on them A pair of scissors left outdoors has rusted.
A. They are made of chemicals. B. They change color and give off energy C. It is easy to reverse the explosion D. They are only used for special occasions How are fireworks examples of chemical reactions?
Which of Mark's observations would show that a burning candle is a chemical reaction? A. black smoke is given off, how gases are rising B. the wax starts to melt C. the candle is white and made of wax and a wick D. time passes one minute at a time Mark made observations as he watched a white candle burn. Use his data to answer the question.
Which of Mark's observations would show that a burning candle has physical changes? A. black smoke is given off, hot gases are rising B. the wax starts to melt C. the flame glows red and orange D. time passes one minute at a time Mark made observations as he watched a white candle burn. Use his data to answer the question.
When it is over, the solution weighs 24 grams. Why has the weight changed? A. A gas has formed and left the mixture B. The vinegar has evaporated C. The new solution is lighter D. Baking soda is lighter when dissolved in vinegar Five grams of baking soda and 20 grams of vinegar are added together. A bubbling reaction starts.
A. carrots cut up in a salad B. vinegar and oil mixed together C. juice and water stirred together D. sugar and cream boiled to make a thick sauce Which of these foods have been through a chemical change?
A. Yes, a gas has been given off B. Yes, the color has changed C. No, water does not react chemically D. No, no new substances have formed A student watches an ice cube melt into a puddle of water. Has a chemical reaction taken place?
If she used baking soda instead of milk, which of the following would happen between baking soda and vinegar? A. It would also become slightly thickened B. It would not mix well together C. It would bubble and form a gas D. It would harden to become a solid While cooking, Amber combined vinegar and milk, which slightly thickened.
A. Chemical reactions between two substances are easily reversible B. Anytime a solid and liquid are combined, they always form a solid C. Changing one of the materials in a chemical reaction will usually change the results D. Anytime vinegar is used in chemistry, a gas is always released Which of the following is true about chemical reactions?
What would be proof of this? A. The gasoline sometimes evaporates. B. A gas called exhaust is produced. C. The car moves using its own power. D. Gasoline is a liquid. A student was told that a car using gasoline was an example of a chemical change.
A. Two liquids are combined to make a fruit juice drink. B. Liquids and solids are combined to make chocolate chip cookies. C. Popcorn kernels are heated to make a bowl of popcorn. D. Two metals react in a mild acid to make electricity in batteries. Which is the best example of a chemical reaction that will help people?