Elements, atoms and molecules...let's review

Elements, Atoms and Molecules

That means it can't be broken down into a simpler substance. There are 118 elements that make up the UNIVERSE!!!

​

An element is a pure substance.

There are 6 elements that are essential for life:

Carbon
Hydrogen
Oxygen
Nitrogen
Phosphorus
Sulfur

Elements of Life

​We use the acronym CHONPS to help us remember that.

Multiple Choice

There are _______________ known elements on Earth. These elements make up everything that exists in the Universe.

• 12

• 118

• 365

• 100

Multiple Choice

All of the following are elements that are essential to life, except

• hydrogen

• oxygen
• gold
• carbon
• nitrogen

Atoms

​An atom is the smallest unit of an element

Atoms are made of particles of matter (protons and nuetrons), surrounded by particles of negatively charged energy called, electrons. All atoms want to be stable, which means they need full energy levels of electrons. They do this by seeking out other atoms to give electrons to, or share electrons with.

Multiple Choice

___________are the smallest units of an element.

• carbohydrates

• protons

• atoms

• electrons

Multiple Choice

Atoms are made of particles of matter (protons and neutrons) and are surrounded by particles of energy, called ___________

• electrons

• protons

• neutrons

• none of these are correct

When atoms come together to share energy, thats called a chemical bond. These types of reactions create entirely new substances.

Molecules

Multiple Choice

To obtain stablity, atoms give or share electrons with other atoms. This type of reaction is called a _________.

• chemical bond
• thermal exchange
• nuclear fusion
• ionic reaction

Multiple Choice

Which of the following is NOT a macromolecule?

• lipids

• carbohydrate

• protein

• All of these are macromolecules

• There are 4 macromolecules that make up Carbohydrates, lipids, proteins, and nucleic acids

Macromolecules

Multiple Choice

When atoms combine to share energy, they create new substances called ___________________.

• atoms

• ions
• molecules
• elements

Multiple Choice

Molecules can combine to create LARGER more complex molecules called__________

• micromolecules

• macromolecules

• polymers

• monomers