Week 1 & 2 Recap

Which of the following is an example of an element?

• Oxygen

• Water

• Salt

• Air

What is a compound?

• A mixture of substances not chemically combined

• A mixture of two or more elements that are chemically combined

• A substance made of only one type of atom

• A type of homogeneous mixture

Tags

NGSS.MS-PS1-1

Which of the following best describes a homogeneous mixture?

• The composition is uniform throughout

• The components are visibly different

• It contains only one type of atom

• It is always a liquid

What is cohesion?

• The attraction between like molecules

• The attraction between different substances

• The process of mixing two substances

• The ability of a liquid to resist flow

Which of the following best describes a mixture?

• A substance made of only one type of atom

• A combination of two or more substances that are not chemically bonded

• A substance with a fixed ratio of elements

• A pure compound

Which of the following is a heterogeneous mixture?

• Salad

• Saltwater

• Air

• Vinegar

Adhesion is best described as:

• The force that holds molecules of different substances together

• The force that holds molecules of the same substance together

• The process of separating mixtures

• The ability of a substance to dissolve in water

Which of the following statements is true about elements?

• Elements are made up of only one kind of atom

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

• Elements are always found as gases

• Elements are mixtures of compounds

Which of the following is NOT a property of a compound?

• It can be separated by physical means

• It has a fixed composition

• It is made of two or more elements

• Its properties are different from its component elements

Which of the following is an example of a physical method to separate a mixture?

• Using a magnet to remove iron filings from sand

• Burning wood to produce ash

• Electrolysis of water

• Reacting vinegar with baking soda