PS.5.1.1 Carry out investigations to compare the weight of objects before and after an interaction.
A deflated balloon with a mass of 5 grams is blown up and popped. If all the pieces are weighed what would the total mass be?
5 grams
Raymond was cleaning out his cupboard. He put a cast iron pan outside with his trash. A week later he noticed that the pan rusted. Was this a physical or chemical change?
Chemical
Why are most pizza pans made out of metal instead of glass?
Metal is a conductor that would allow heat to transfer easily from the oven to the pizza.
Which object would most likely require the most force to lift a book or a boulder?
Boulder
Draw a graph that displays an object at rest
An x/y graph with a straight horizontal line
Carmen place 10 mg of salt, 20 mg of sugar and 30 mg of water into a cup and stirs. What is the mass of the solution?
60 mg
Characteristics used to identify or describe matter are called what?
Properties
What happens to the weight of an object when it is heated and then cooled back to its original temperature?
It stays the same
Which best explains why it is difficult for cars to slow down when the roads are wet?
There is a decrease in friction between tires and the road
Draw a time/distance graph that displays an object with a constant speed.
x/y graph with a straight line moving diagonally
Elsa is making a grilled ham-and-cheese sandwich. She uses a 20-gram slice of cheese, 40 grams of sliced ham, and two 15-gram slices of bread. After she heats the sandwich on a griddle, the cheese is melted.What will be the mass of her sandwich?
90 g
John's dad cooks on an outdoor grill by burning wood. John notices that the wood turns to ashes as it burns. John claims that this is a chemical change. Explain why John is correct.
Ashes are a different substance from wood and therefor indicate that an irreversible (chemical change) took place.
Why do we use materials like wood and plastic for handles on cooking pots?
They are insulators and prevent us from getting burned.
John pushed two identical toy cars across the same flat smooth floor. Why did both cars travel the same distance?
He applied the same force to both cars.
Draw a Distance, speed and time triangle. Write the appropriate formula next to each letter in the triangle.
Top of the triangle: D (D=SxT)
Bottom Left side of triangle: S (S=D/T)
Bottom Right side of triangle: T (T= D/S)
Sam built a rocket using a full set of blocks. How would taking the rocket apart effect the total mass of the blocks?
It wouldn't, the rocket's mass is the same with the pieces together or apart.
In a dish, Fred dissolved 1 gram of salt into 10 milliliters of water and left it outside for a few days in the sun. After a few days he found there was no more water in the cup and there was a crystal substance at the bottom of the cup. Explain what happened and whether this was physical or chemical change.
The water evaporated out of the cup leaving the salt in the bottom of the cup. This is a physical change as no new substances was created.
What happens to the particles in matter when heat is taken away?
Jamie dropped a ball and let it bounce several times. Jamie observed that the ball bounced much higher on the first bounce than on the third bounce. Which force was most likely responsible for this?
Gravity
Draw a time / distance graph that matches this scenario: Jack rides his bike to the park at a constant speed,stops to play baseball and then returns home at a constant speed.
x/y graph with straight line moving diagonally then a straight horizontal line followed by a straight diagonally moving line back to the start.
Devon has a sealed, cold, large soda bottle with a mass of 1 kg. He put the sealed bottle out in the sun and noticed condensation forming on the outside of the bottle. What is the new mass of the bottle?
1kg
Making New Substances
A group of students are investigating whether the mixing of two or more substances can result in a new substance. In their investigation, they conduct two experiments in which different substances are mixed.
In the first experiment, the students combine 10 grams of baking soda with 15 milliliters of lemon juice in a beaker. They quickly pour the lemon juice over the baking soda. The students observe that when the two substances are combined, many bubbles form and rise to the top of the beaker.
In the second experiment, the students combine 10 grams of baking soda with 15 milliliters of yellow dishwashing liquid in a beaker. They slowly pour the dishwashing liquid over the baking soda and mix them together. The students observe that when the two substances are mixed, the dishwashing liquid becomes thicker and more dull in color.
Which of their observations proved that a chemical reaction was taking place?
Gas bubbles
Why do asphalt streets sometimes have cracks in them? What could be done to reduce the cracking? (Hint think about our lesson outside on the sidewalk)
When the street is heated it will expand and contract when cooled. Expansion joints could be added to allow for expansion and contraction due to temperature fluctuations.
Chuck is delivering mail using a mail cart. He walks along the sidewalk at a constant speed. What will most likely be needed to keep the cart moving at the same speed if two additional large bundles of mail are added to the cart?
An increase in applied force
Dawson is riding his bike to a park 2 miles away from his house. In the first 8 minutes of his trip he has traveled 1/2 of a mile. If he continues to travel at that speed how long would it take for him to arrive at the park?
32 mins