Coffee is a ___________________.

Trail mix is a _________________.

Chicken broth is a _______________.

Spaghetti and meatballs is a ___________________.

Chocolate milk is a ______________.

George is writing a newspaper article about the fire at the local library. His introductory paragraph has an example of conservation of mass. "Our town library dealt with a terrible fire in one of its rooms over the weekend. The room contained much-loved books and magazines. Firefighters rushed to the scene, but were too late. All that remained of the books and magazines were ash, water vapor, and carbon dioxide fumes. The mayor arrived soon afterward and urged everyone to donate to help rebuild this important community building." Which sentence has an example of the law of conservation of mass?

Annie learns that the compound sulfuric acid is called the universal chemical. The acid is used in everything from gasoline to paper. Annie uses beads in three different colors to model sulfuric acid. Based on the model, what is the chemical formula of sulfuric acid? Hint: count the atoms

Jonah and Rachel volunteer at the recycling center sorting and organizing recyclable objects. Jonah is sorting aluminum cans and crushing the cans to fit more in the bag. Rachel is sorting metal and steel objects into appropriate bins. Jonah realizes that even though he is crushing the cans, the amount of material in each can is unchanged. Which of the following describes the process that is taking place?

Jonah and Rachel volunteer at the recycling center sorting and organizing recyclable objects. Jonah is sorting aluminum cans and crushing the cans to fit more in the bag. Rachel is sorting metal and steel objects into appropriate bins. Jonah realizes that even though he is crushing the cans, the amount of material in each can is unchanged. Rachel notices that many objects have rusted. Rusting is a chemical change that some metal and steel objects undergo when they are exposed to oxygen. Which option best describes a chemical change?

Teresa stays home from school because she has a cold. Her father makes her chicken noodle soup and urges her to drink lots of orange juice. Both the soup and juice are mixtures, but one is a homogeneous mixture and the other is heterogeneous. Which food item is homogeneous?

Teresa stays home from school because she has a cold. Her father makes her chicken noodle soup and urges her to drink lots of orange juice. Both the soup and juice are mixtures, but one is a homogeneous mixture and the other is heterogeneous. Which food item is heterogeneous?

Martina is camping and needs wood for a cooking fire as well as for shelter. She gathers a variety of logs and branches from the surrounding area. She chops and shapes some of the larger pieces of wood into uniform shapes to build her shelter. What kind of change is taking place as the wood is chopped?

Fill in a word that correctly completes the sentence. Martina is camping and needs wood for a cooking fire as well as for shelter. She gathers a variety of logs and branches from the surrounding area. She burns some of the smaller twigs and branches to start a fire in order to cook her dinner. Burning wood is an example of a _______________change.

The formula for density is:

Density =

D=

When you throw a penny into a wishing fountain it sinks, why does it sink?

When you throw a feather in water it floats, why does it float?