Podcast
Questions and Answers
A substance is described as being light and used in the construction of airplanes. Which of the following is the most likely element?
A substance is described as being light and used in the construction of airplanes. Which of the following is the most likely element?
- Aluminum (correct)
- Iron
- Lead
- Copper
Which of the following correctly identifies the elements present in aluminum sulfate?
Which of the following correctly identifies the elements present in aluminum sulfate?
- Aluminum, Sodium, Oxygen
- Aluminum, Sulfur, Potassium
- Aluminum, Sulfur, Oxygen (correct)
- Sulfur, Oxygen, Potassium
What is the key difference between a molecule of carbon dioxide ($CO_2$) and a molecule of carbon monoxide ($CO$)?
What is the key difference between a molecule of carbon dioxide ($CO_2$) and a molecule of carbon monoxide ($CO$)?
- Carbon dioxide is flammable, while carbon monoxide is not.
- Carbon dioxide is an element, while carbon monoxide is a compound.
- Carbon dioxide contains twice as many oxygen atoms as carbon monoxide for each carbon atom. (correct)
- Carbon monoxide is heavier than carbon dioxide.
Given the chemical formulas $MgSO_4$, $H_2O$, $N_2$, and $O_2$, which element is present in more than one of these substances?
Given the chemical formulas $MgSO_4$, $H_2O$, $N_2$, and $O_2$, which element is present in more than one of these substances?
Consider a diagram where circles represent atoms. Which of the following diagrams would represent a chemical compound?
Consider a diagram where circles represent atoms. Which of the following diagrams would represent a chemical compound?
Which of the following statements accurately describes the relationship between chemical elements, atoms, and molecules?
Which of the following statements accurately describes the relationship between chemical elements, atoms, and molecules?
Element symbols are used instead of element names for which primary reason?
Element symbols are used instead of element names for which primary reason?
Why do some element symbols, like Cl (Chlorine) and Si (Silicon), have two letters?
Why do some element symbols, like Cl (Chlorine) and Si (Silicon), have two letters?
Metals are known to conduct electricity and heat effectively. Which property of metals is most directly responsible for this phenomenon?
Metals are known to conduct electricity and heat effectively. Which property of metals is most directly responsible for this phenomenon?
Considering the properties and uses of different materials, which of the following correctly matches a material to its application based on its characteristics?
Considering the properties and uses of different materials, which of the following correctly matches a material to its application based on its characteristics?
Flashcards
Chemical Element
Chemical Element
Substances containing only one type of atom.
Atom
Atom
The smallest unit of an element that retains its chemical properties
Molecule
Molecule
Two or more atoms held together by chemical bonds.
Chemical Compound
Chemical Compound
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Group (Periodic Table)
Group (Periodic Table)
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Chemical Formula
Chemical Formula
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Simple Substance
Simple Substance
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Particle Diagram
Particle Diagram
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Study Notes
- A collection of atoms of the same type is called an element
- The smallest particle of an element is called an atom
- Two or more atoms linked by chemical bonds form a molecule
- A substance with a chemical formula containing atoms of different elements is called a compound
- Vertical columns in the periodic table are called groups
- Horizontal rows in the periodic table are called periods
- Mg is the symbol for magnesium
- O is the symbol for oxygen
- Ca is the symbol for calcium
- B is the symbol for boron
- K is the symbol for potassium
- H is the symbol for hydrogen
- Ne is the symbol for Neon
- P is the symbol for phosphor
- C is the symbol for carbon
- Na is the symbol for sodium
- Cl is the symbol for chlorine
- Si is the symbol for silicon
- Scientists decided to use symbols because it avoids use of element names
- Some symbols like Cl and Si have two letters
- Metals have luster on the surface and are flexible to scratches
- Metals are soft when hit
- Metals transmit heat and electricity well
- Metals are malleable, meaning they can be shaped
- Metals are ductile, which means they can be pulled to produce wires
- Three differences between metals and non-metals are luster, heat transmission and ductility
- Steel is a metallic alloy that is very strong and is used to build bridges
- The metal that has a shine, takes the shape it is given and is used to make jewelry is gold
- A non-metal material that is light and can be used to produce bottles is plastic
Here are the answers to question 3.5
- The lightweight metal used to make airplanes is aluminum
- The metal used to make home containers is sheet metal
- The non-metal material made of wood and from which thin boards can be prepared to write on is chalk
- The chemical formula for the compounds formed from the elements potassium and chlorine is KCl
- The elements that make up aluminum sulfate are aluminum, sulfur and oxygen
- The chemical formula of the compound containing calcium, carbon and oxygen is CaCO3
- The difference between the molecules of carbon dioxide and carbon monoxide lies in the number of oxygen molecules
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Description
This lesson covers basic chemistry concepts such as elements, atoms, molecules, and compounds. It also includes a discussion of the layout of the periodic table (groups and periods). You'll also learn the symbols of common elements.
