Law of Conservation of Matter

 Lucas is boiling 200 g of salt water in an open pot on the stove. Which is a possible weight of the contents of the pot after 10 minutes of boiling?                          

•  A. 150 g because some water evaporates into the air surrounding the pot and decreases the total mass
• B. 100 g because the salt dissolves in the hot water and has no mass 
•  C. 200 g because none of the salt or water is lost during the interaction and mass is conserved 
•  D. 250 g because some of the water evaporates into the air surrounding the pot, but the salt becomes a solid and adds mass

Tags

NGSS.MS-PS1-5

A student flattens a ball of clay he is given and shapes it to resemble a boat.  Which best describes the masses of the clay ball and the clay boat? 

• The mass of the clay ball is more than the mass of the clay boat.
• The mass of the clay boat is more than the mass of the clay ball.
• The masses of the clay ball and the clay boat are the same. 
• The clay ball has mass, but the clay boat does not. 

An ice cube is placed in a glass of water. The total weight of the ice cube and water is 0.5 pounds.  After the ice cube melts, what will most likely be the total weight of the water? 

• 0.4 pounds
• 0.5 pounds
• 0.8 pounds
• 1.0 pound

Tags

NGSS.MS-PS1-5

Robert fills an 8 pound cooler with 20 pounds of ice. After leaving the cooler in the sun for an hour, how much will the cooler and the melted ice weigh? 

• 12 lbs
• 20 lbs
• 28 lbs
• 24 lbs

Max adds 250 g of water and 250 g of rice to a pot on a stove and covers the pot with a lid. As the water boils, it gets absorbed by the rice. How much do the contents of the pot weigh after the rice finishes cooking? 

• 250 g
• 400 g
• 500 g
• 600 g

Tags

NGSS.MS-PS1-5

Ivy mixed 30 g of hot chocolate mix with 200 g of hot milk. She then added 5 marshmallows with a mass of 8 g each. Which best describes the mass of her hot chocolate? 

• 235 grams
• 238 grams
• 270 grams
• 243 grams

Data that is observed, not measured.  Includes observations such as: color, texture, odor, appearance, and taste. 

• Qualitative Data
• Quantitative Data

Data that deals with numbers and is measured using a tool.  Includes observations such as: length, height, weight, temperature, speed, and time. 

• Qualitative Data
• Quantitative Data

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-4

What must always be included when stating quantitative data? 

• a color
• the tool used
• a unit
• the weight of the object

Mass is:

• The amount of matter in an object.
• The amount of matter in a small amount of space.
• The amount of matter plus the volume.
• The amount of matter that makes an object more dense