A scientist is analyzing a shiny, silver-colored material. She finds that it is made entirely of atoms with 13 protons and is listed on the periodic table. How should this material be classified?

• Compound

• Mixture

• Element

• Molecule

You mix salt and water in a glass. After stirring, the salt dissolves completely, and the liquid appears uniform throughout. What type of matter have you created?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

A student combines iron filings and sulfur powder in a beaker and heats the mixture. After the reaction, a new substance with properties different from both iron and sulfur forms. How should this new substance be classified?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chef prepares a salad by mixing lettuce, tomatoes, cucumbers, and dressing in a bowl. Each ingredient retains its original properties and can be separated easily. How should this salad be classified?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Water is made up of two hydrogen atoms bonded to one oxygen atom. What classification best describes water?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Tags

NGSS.MS-PS1-1

A student is studying an unknown substance and determines that it cannot be broken down into simpler substances by chemical means. Additionally, it has an atomic number of 8 on the periodic table. How should this substance be classified?

• Molecule

• Compound

• Element

• Mixture

A jeweler is testing a shiny yellow material to determine if it is pure gold. She discovers that it contains both gold and copper atoms mixed together, but they are not chemically bonded. How should this material be classified?

• element

• compound

• homogenous mixture

• heterogeneous mixture

A student finds a substance that cannot be separated into simpler substances by physical or chemical means. It is made entirely of atoms with 79 protons. What classification best describes this substance?

• element

• compound

• homogeneous mixture

• heterogeneous mixture

A chemist combines hydrogen gas and oxygen gas in a sealed container and ignites the mixture. After the reaction, water is formed, which has properties different from both hydrogen and oxygen. How should water be classified?

• element

• compound

• homogeneous mixture

• heterogeneous mixture

A mixture of sand and iron filings is placed in a container. Using a magnet, the iron filings are removed, leaving the sand behind. What type of matter was the original mixture?

• element

• compound

• homogeneous mixture

• heterogeneous mixture