Abigail is learning about chemistry. She wants to know, what is an element?

• A combination of two or more substances.

• a pure substance made of only one type of atom.

• a mixture that is the same throughout.

• a substance with a variable composition.

Tags

NGSS.MS-PS1-1

Sophia is conducting an experiment in her chemistry class. Which of the following is a characteristic of a compound?

• It contains only one type of atom.

• it cannot be broken down into simpler substances.

• it is made of two or more different elements bonded together.

• it has a uniform composition.

Tags

NGSS.MS-PS1-1

Charlotte is making a salad and notices that the ingredients are mixed together evenly. How is this homogeneous mixture different from a heterogeneous mixture?

• homogenous mixtures have a uniform composition, while heterogenous mixtures do not.

• heterogenous mixtures can be separated easily, while homogenous mixtures cannot.

• homogenous mixtures contain only one type of substance, while heterogenous mixtures contain multiple types.

• heterogenous mixtures have a uniform composition, while homogenous mixtures do not.

Ava is preparing a meal and wants to include a heterogeneous mixture. Which of the following should she choose?

• saltwater

• air

• salad

• sugar water

Luna and Michael are working on a science project. They have a sample of matter composed of sodium and chlorine bonded together. How should this sample be classified?

• element

• compound

• homogenous mixture

• heterogenous mixture

Tags

NGSS.MS-PS1-1

Ava and Rohan are working on a science project. They need to identify whether the following is an element, compound, or mixture: brass (an alloy of copper and zinc).

• element

• compound

• homogenous mixture

• heterogenous mixture

Arjun is at the beach and collects a sample that contains sand, water, and salt. How would you classify this sample?

• homogenous mixture

• compound

• heterogenous mixture

• element

Nora is learning about chemistry and wonders how the properties of water differ from those of its constituent elements, hydrogen and oxygen. How can the properties of a compound differ from those of its constituent elements?

• the compound can have different physical properties than the individual elements.

• the compound can be broken into its elements.

• the compound contains only one type of atom.

• the properties are always the same as the individual elements.

Tags

NGSS.MS-PS1-1

Mason is making a fruit salad. Which of the following statements about the fruit salad mixture is true?

• mixtures can be separated by physical means.

• mixtures have fixed ratios of components.

• mixtures contain only one type of substance.

• mixtures cannot retain the properties of their components.

Rohan is working on a science project and needs to classify different substances. Why is it important for him to classify matter as elements, compounds, or mixtures?

• to make chemistry more complex.

• to understand how to separate them easily.

• to predict how substances will react and behave.

• to determine their color.