Elements, Compounds, and Mixtures

What is the fundamental building block of all matter?

• Compounds

• Mixtures

• Elements

• Molecules

How many known elements are there?

• 92

• 118

• 102

• 108

Which element is the simplest, with only one proton?

• Helium

• Oxygen

• Hydrogen

• Carbon

What is the main characteristic that distinguishes one element from another?

• Number of neutrons

• Number of electrons

• Atomic number

• Atomic mass

What is formed when two or more different elements combine chemically in a fixed ratio?

• Mixture

• Element

• Compound

• Solution

What is an example of a compound mentioned in the text?

• Water

• Sodium chloride

• Carbon dioxide

• Ammonia

Tags

NGSS.MS-PS1-1

What is the main difference between compounds and mixtures?

• Compounds are physically combined, mixtures are chemically combined

• Compounds are chemically combined, mixtures are physically combined

• Compounds can be separated by physical means, mixtures cannot

• Compounds retain their individual properties, mixtures do not

How can mixtures be separated?

• By chemical reactions

• By physical means

• By nuclear reactions

• By electrolysis

Which of the following is NOT a method to separate mixtures?

• Filtration

• Evaporation

• Distillation

• Combustion

What is the significance of understanding elements, compounds, and mixtures?

• It helps in cooking

• It is essential for understanding the composition and behavior of matter

• It is only useful in chemistry

• It is not important

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5