1
Lara is looking at a diamond ring and a pencil lead. She knows both contain carbon but have very different properties. The pencil lead contains which allotrope of carbon?
2
Chloe is mixing oil and water. After shaking, she notices that tiny droplets of oil are dispersed throughout the water but they do not settle out easily. This mixture is best classified as:
4
Chloe reads that a certain state of matter has no fixed shape or volume and particles are far apart with very weak forces. She observes helium gas in a balloon. What state of matter is helium in the balloon?
5
A homogeneous mixture has:
6
Uma is studying brass, which is an alloy of copper and zinc. The two metals are mixed together at the atomic level. What type of solution is brass?
7
An unsaturated solution contains:
8
A heterogeneous mixture has:
9
Patricia is making a solution of salt in water. She keeps adding salt until no more salt will dissolve and some salt remains at the bottom. What type of solution does Patricia have?
10
Which of the following best describes a mixture?