Changes in Matter

A pure substance that cannot be broken down into any other substance.

• Elements

• Compounds

• Mixtures

Which of the following is a way in which elements and compounds are similar?

• Elements and compounds are pure substances.
• Elements and compounds are both made up of different kinds of atoms.
• Elements and compounds can both be broken down by physical means.
• Elements and compounds are listed on the periodic table.

What kind of substance is composed of two or more different elements that are chemically combined?

• element

• mixture

• solution

• compound

Tags

NGSS.MS-PS1-5

True or False: Mixtures can be separated by physical means.

• False

• True

True or False: Pure substances can be separated by physical means.

• False

• True

Which of these solutions is an acid?

• Dish Soap: pH of 12
• Tomato Soup: pH of 4
• Baking Soda: pH of 9
• Drain Cleaner: pH of 14

Which of the following word pairs correctly completes the sentence below?
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.

• Acids; pH less than 7
• Acids; pH greater than 7
• Bases; pH greater than 7
• Bases; pH less than 7

Which of the following statements is correct?

• Litmus paper turns red when placed in a base.

• Litmus paper turns blue when placed in a base.

• Litmus paper turns blue when placed in an acid.

• Litmus paper turns red when placed in a neutral.

Which of the following is not the properties of a base?

• Slipery

• Have a pH less than 7

• The pH scale of alkalis from 8 - 14

• Corrosive

Pot A has 50% water and 50% salt.

Pot B has 70% water and 30% salt.

Pot C has 90 % water and 10% salt.

True or False: All pots wills have the same melting and boiling points

• false because there is different amounts of water and salt.

• true because they all have water and salt.