Elements Compounds Unit 1

Multiple Choice

Why is it important to understand the difference between elements and compounds in everyday life?

• It is important to understand the difference between elements and compounds to make informed choices about safety, nutrition, and environmental impact in everyday life.
• The difference between elements and compounds is purely academic.
• Elements and compounds have no impact on daily health choices.
• Understanding elements and compounds is only relevant for scientists.

Multiple Choice

Which of the following is represented by a chemical symbol in the periodic table?

• Element

• Compound

• Mixture

• Molecule

Multiple Choice

Which of the following best describes the difference between an element and a compound?

• An element is made of one type of atom, while a compound is made of two or more types of atoms.

• An element is made of two or more types of atoms, while a compound is made of one type of atom.

• Both elements and compounds are made of only one type of atom.

• Elements and compounds have the same structure.

Multiple Select

Based on the models shown, which of the following are compounds?

• The blue molecule with two atoms

• The molecule with yellow and red atoms

• The molecule with red and blue atoms

• The molecule with three blue atoms

Multiple Choice

Explain how chemical formulas help chemists understand the composition of molecules.

• Chemical formulas provide information about the taste of different compounds.
• Chemical formulas help chemists understand the composition of molecules by indicating the types and numbers of atoms present, which informs them about the molecule's structure and properties.
• Chemical formulas are used to measure the temperature of substances.
• Chemical formulas only show the color of molecules, not their composition.

Multiple Choice

In the chemical formula K2Cr2O7, how many atoms of oxygen are present?

• 2

• 7

• 9

• 3

Multiple Choice

Give two examples of elements and two examples of compounds that can be found in a kitchen, based on the image.

• Elements: Iron (Fe), Oxygen (O); Compounds: Carbon Dioxide (CO2), Vinegar (C2H4O2)
• Elements: Calcium (Ca), Magnesium (Mg); Compounds: Baking Soda (NaHCO3), Sugar (C12H22O11)
• Elements: Sodium (Na), Chlorine (Cl); Compounds: Sodium Chloride (NaCl), Water (H2O)
• Elements: Gold (Au), Mercury (Hg); Compounds: Ammonia (NH3), Ethanol (C2H5OH)

Multiple Choice

Table salt is a compound made of sodium and ___.

• chlorine
• oxygen

• carbon

• hydrogen

Open Ended

Reflecting on today's lesson about elements and compounds, what is one question you still have or one thing you would like to learn more about?

Multiple Choice

What is the purpose of the periodic table in chemistry?

• To organize elements based on their properties

• To list all known compounds

• To show chemical reactions

• To display laboratory equipment