Exploring Mixtures and Solutions

Which of the following is a characteristic of a homogeneous mixture?

• The components are visibly distinct.

• The composition is uniform throughout.

• It can be separated by filtration.

• It always contains two or more phases.

Identify the type of mixture: A salad with lettuce, tomatoes, and cucumbers.

• Homogeneous mixture

• Heterogeneous mixture

• Solution

• Compound

Which of the following is an example of a compound?

• Saltwater

• Iron filings

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NGSS.MS-PS1-1

Explain why saltwater is considered a solution.

• It is a mixture of two elements.

• It has a uniform composition and the salt is dissolved in the water.

• It can be separated by physical means.

• It contains visible particles.

Which of the following best describes the pH scale?

• A measure of the concentration of hydrogen ions in a solution.

• A measure of the density of a solution.

• A measure of the temperature of a solution.

• A measure of the volume of a solution.

Which of the following statements is true about elements?

• Elements can be broken down into simpler substances by chemical means.

• Elements are composed of two or more types of atoms.

• Elements are pure substances consisting of only one type of atom.

• Elements are always found in a gaseous state.

Compare and contrast elements and compounds.

• Both are mixtures of different substances.

• Elements are pure substances, while compounds are combinations of two or more elements.

• Compounds can be broken down into elements by physical means.

• Elements and compounds have the same chemical properties.

A student mixes oil and water in a beaker. What type of mixture is formed, and why?

• Homogeneous mixture, because the components are evenly distributed.

• Heterogeneous mixture, because the components do not mix uniformly.

• Solution, because the oil dissolves in the water.

• Compound, because a new substance is formed.

Predict the effect of adding a strong acid to a neutral solution.

• The pH will increase.

• The pH will decrease.

• The pH will remain the same.

• The solution will become a solid.

Which of the following is a property of a solution?

• It scatters light.

• It has a fixed composition.

• It is always colorless.

• It is a homogeneous mixture.