Unit 2 Chemistry: Day 11 Elements and Compounds

Explore more infographics like this one on the web's largest information design community - Visually.

A compound is two or more different elements combined chemically. This means that they are combined through a chemical reaction  and are now difficult to separate.

                    +
   

One or more atoms of an element                          You can’t just push two elements

are going along. Remember that                             together and make a compound.

an element is the substance                                    There has to be a chemical reaction!

that can’t be broken down                           

into smaller particles.

 
Once the two elements get together                                   The Classic Example: Salt

they are a completely different

substances. They don’t

have the same properties anymore.

So an element is a substance  that can’t be broken down. A compound is two or more different elements combined to form a NEW substance.

Common Compounds:

NaCl (Salt): Combination of sodium and chlorine

H₂O (Water): Combination of hydrogen and oxygen

CHNaO₃(Baking soda): Combination of carbon, hydrogen, sodium, and oxygen

C₁₂H₂₂O₁₁ (Sugar): Combination of carbon, hydrogen, and oxygen

Metaphors are a great way to remember scientific concepts. You can make a metaphor by:

·        Listing the differences of the concept side by side

·        Visualize the concept

·        Connecting the differences and the visualization to something  in real life

but with similar qualities.

1. Now You Try on Your Own Check Yo' Self using the exemplar below:

2.  Brainpop Video: Compounds and Mixtures 

Click here to watch Brainpop Video: Compound and Mixtures

• Watch Brainpop Video: Compounds and Mixtures. 
• Take the review quiz and review until you reach at least 80% mastery. 
• Once you reach 80% mastery email results to kippcourage6science@gmail.com

LIFEWORK

Write summaries anywhere you see an “S.” Then answer the questions on the back

Matter,  Elements, Molecules, and Compounds

---

¹     What is matter? Matter is the stuff that makes up everything in the universe. Matter has mass and takes up space. Matter is made of atoms. Solids, liquids, gases, and plasma are all matter. When all atoms that make up a substance are the same, then that substance is an element. Elements are made of only one kind of atom. Because of this, elements are called "pure" substances.

An atom is the smallest piece of an element that still has the properties of that element. For example, aluminum is a lightweight, shiny metal. If we took a piece of aluminum and cut it into small pieces, it would still be aluminum. It would still be a lightweight, shiny metal. The smallest piece would be called an atom. Atoms are so small they cannot be seen even with a microscope. Atoms consist of a nucleus that has protons and neutrons surrounded by electrons outside the nucleus.

²     Atoms of different elements can combine to make new substances. A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds. When two hydrogen atoms combine with one oxygen atom, it becomes the compound water. The oxygen we breathe is actually two atoms of oxygen combined, so it is a molecule of oxygen. We use abbreviations for elements, molecules, and compounds. These abbreviations are called chemical symbols. The chemical symbol for an oxygen molecule is O₂.

³     The compound water has a chemical symbol of H₂O. This is like the "recipe" for water. It tells us that a water molecule is made of two atoms of hydrogen and one atom of oxygen. Oxygen is a gas that we can't see, hear, smell, taste, or feel. But it's in the air we breathe, and without it we would die. Hydrogen, also a gas, is the lightest substance on Earth. When two atoms of hydrogen join together with one atom of oxygen, those two gases make a liquid compound we call water. Water, a liquid at room temperature, is a very different substance from the two gases that it is made of. Many different compounds can be made when different atoms combine.

⁴     There are about 92 elements that naturally occur on Earth. Different sources will say different numbers of elements occur naturally. Many elements have been made by scientists in a laboratory. With that many elements to form combinations, many millions of different molecules and compounds can be made. How is that possible? Think of our alphabet. The English alphabet has 26 letters. Those 26 letters can be combined in different ways to make millions of words. Atoms are like the letters of the alphabet and the compounds they make are like words.

⁵     Now that you have learned the language of chemistry, you are ready to learn more about elements, atoms, and the ways they combine.

1.   What is matter?   The stuff that makes up everything in the universe   Has mass and takes up space   Is made of atoms   Can be solid, liquid, gas, or plasma   All of the above	2.   What is an element?   A pure substance   Made of only one kind of atom   Both A and B   None of the above
3.   What is an atom?   The smallest piece of an element that still has the properties of that element   A gas   A solid   A metal	4.   Atoms consist of ______.   Two or more molecules   Gases   Solids   A nucleus that has protons and neutrons with electrons outside
5.   Abbreviations for elements, molecules, and compounds are called ______.   Chemical symbols   Abbr.   Shorthand   Letters	6.   What is the chemical symbol for water?   Wa   H2O   NaCl   O2
7.   About how many elements naturally occur on Earth?   102   92   26   1,093	8.   What is the lightest substance on Earth?   Hydrogen   Oxygen   Water   Salt