How often do chemists from a city's water department test the water supply?

• every hour

• every day

• every week

• every month

• every year

Where did Dr. Yung (the chemist near Westfield) find the reddish-brown substance when she examined all the possible sources?

• coming from the pipes into the houses

• in the wells where the water comes from

• in the ponds nearby the town

• in all water everywhere in Westfield

When examining the following evidence, which is the best evidence we should use?

• ugly color, solid

• white, small pieces

• white, small, grainy, crystals

Tags

NGSS.MS-PS1-2

Consider your answer to the previous question:

Consider the following substance descriptions. Does the evidence support that they are the same substances?

Substance 1: white, small, grainy, crystals

Substance 2: black, fine powder.

What is the best explanation for why this substance is the same or different?

• The visual properties of the two substances are different.

• They don't look the same so they are not the same.

• They are the same because they are both small tiny pieces.

• There is no way to determine if they are the same/different based on this information.

Tags

NGSS.MS-PS1-2

Are these two samples the same substance?

• They are the same substances because they are both white powders.

• They are the same substances because they both have similar atomic structures.

• They are different substances because they have different atoms making them up.

• They are the same because they both have the same number of atoms.

Tags

NGSS.MS-PS1-1

Why do different substances have different properties?

• They are made of different groups of atoms.

• They look different.

• The same atoms can change their properties when needed.

• There are different numbers of the repeating atom groups.

Tags

NGSS.MS-PS1-1

What is the reddish-brown substance in the water of Westfield?

Select the BEST answer.

• The reddish-brown substance is the same as the substance that makes up the pipes.

• The reddish-brown substance is the same substance as the fertilizer.

• The reddish-brown substance is different from both the fertilizer and the pipes.

• The reddish-brown substance is iron oxide or rust.

The tiny pieces that all matter--all the stuff in the world--is made of ...

• atoms

• protons

• molecules

• electrons

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

A structure formed by repeating groups of atoms that link together in a large network...

• extended structure

• atoms

• molecules

• proteins

Tags

NGSS.MS-PS1-1

Something that can be observed about a substance, such as color, smell, or boiling point...

• property

• chemistry

• substance

• molecule

Tags

NGSS.MS-PS1-2