Mixtures

Ayala is making salad dressing. She mixes oil and vinegar in a blender until a smooth consistency is formed. Explain whether this is a heterogeneous or a homogeneous mixture and why.

A homogeneous mixture can only form when one of the substances can dissolve the other one. Oil and water cannot dissolve each other, so they must form a heterogeneous mixture with small particles of vinegar dispersed throughout the oil, yet not dissolved.

When fossil fuels, such as gasoline, are burned, they create smoke. Smoke is best described as a heterogeneous mixture of solid particles from the burning fuel dispersed in a gas - usually air. Smoke can be described more specifically as a suspension. What will most likely happen over time to smoke in the atmosphere?

Over time, the solid particles will settle on whatever is outside.

Which are mixtures? Check all that apply.

b d e

Read the description of how ancient metalworkers improved their iron. Then identify the solute and solvent by filling in the blanks.

iron carbon

Simon has collected three samples from the coral reef where he observes marine life. He must determine whether each one is a pure substance or a mixture.

pure substance homogeneous mixture heterogeneous mixture

Blood is composed of many tiny cells in a liquid called plasma.

solid liquid liquid solid

Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn't seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a

suspension. colloid

Which are homogeneous mixtures? Check all that apply.

vinegar sugar water soda pop in a sealed bottle