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Questions and Answers
Questions and Answers
Which of the following statements best describes the relationship between atoms and elements?
Which of the following statements best describes the relationship between atoms and elements?
- Elements are made up of only one type of atom. (correct)
- Atoms are made up of elements.
- Elements are made up of different types of atoms.
- Atoms and elements are the same thing.
Molecules and lattices are formed when atoms are joined together by physical bonds.
Molecules and lattices are formed when atoms are joined together by physical bonds.
False (B)
Give one example of a property that is generally associated with metals but not with non-metals.
Give one example of a property that is generally associated with metals but not with non-metals.
conductivity
In chemical symbols, the first letter is always ______, and if there is a second letter, it is always lowercase.
In chemical symbols, the first letter is always ______, and if there is a second letter, it is always lowercase.
Why is it important to use capital and lowercase letters correctly when writing chemical symbols?
Why is it important to use capital and lowercase letters correctly when writing chemical symbols?
Mendeleev organized the elements in the periodic table based on their atomic numbers.
Mendeleev organized the elements in the periodic table based on their atomic numbers.
Name one group of elements found in the periodic table that are known for being particularly unreactive.
Name one group of elements found in the periodic table that are known for being particularly unreactive.
The horizontal rows in the periodic table are called ______, while the vertical columns are called groups.
The horizontal rows in the periodic table are called ______, while the vertical columns are called groups.
Match the following elements with their symbols:
Match the following elements with their symbols:
What information can be found using the periodic table?
What information can be found using the periodic table?
What is the key difference between a compound and a mixture?
What is the key difference between a compound and a mixture?
Water(H₂O) is an example of a ______, whilst air is a mixture.
Water(H₂O) is an example of a ______, whilst air is a mixture.
A chemical formula can represent a mixture.
A chemical formula can represent a mixture.
What does the chemical formula H₂O tell you about the composition of water?
What does the chemical formula H₂O tell you about the composition of water?
Explain why the properties of a compound can be very different from the properties of the elements that make it up.
Explain why the properties of a compound can be very different from the properties of the elements that make it up.
Melting is a chemical change.
Melting is a chemical change.
Which of the follwing is a sign of a chemical reaction?
Which of the follwing is a sign of a chemical reaction?
Match the process to its type
Match the process to its type
______ is anything that has volume and mass.
______ is anything that has volume and mass.
Describe an experiment to combine elements to create a compound.
Describe an experiment to combine elements to create a compound.
Questions and Answers
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Flashcards
Flashcards
What is an atom?
What is an atom?
The basic unit of matter, contains a nucleus (protons and neutrons) and electrons.
What is an element?
What is an element?
A pure substance consisting of only one type of atom.
What are chemical bonds?
What are chemical bonds?
Forces that hold atoms together to form molecules or lattices.
What is a molecule?
What is a molecule?
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What is a lattice?
What is a lattice?
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What are metals?
What are metals?
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What are non-metals?
What are non-metals?
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What is the Periodic Table?
What is the Periodic Table?
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What are groups in the periodic table?
What are groups in the periodic table?
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What are periods in the periodic table?
What are periods in the periodic table?
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What is a compound?
What is a compound?
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What is a mixture?
What is a mixture?
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What are chemical formulas?
What are chemical formulas?
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What is a physical change?
What is a physical change?
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What is a chemical change?
What is a chemical change?
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What are signs of a chemical reaction?
What are signs of a chemical reaction?
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Flashcards
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Study Notes
Study Notes
Atoms and Elements
- An atom is the smallest unit of matter.
- An element is a pure substance made up of only one type of atom.
- Elements can be identified from a word list or images.
- Terms to define: atom, element.
Chemical Bonds, Molecules, and Lattices
- Atoms join together through chemical bonds to form molecules and lattices.
- Molecules and lattices can be identified using images.
- Examples of substances include atoms, molecules, and lattices.
- Terms to define: molecule, lattice.
Metals and Non-metals
- Metals have common properties such as conductivity, luster, and malleability.
- Non-metals have properties opposite to metals, such as being brittle and poor conductors.
- An element can be predicted to be a metal or non-metal based on its properties.
Element Symbols
- Correctly use upper and lower case letters to write symbols for elements (e.g., C for carbon, Na for sodium).
- A periodic table can be used to look up symbols for elements and vice versa.
- Numbers in chemical formulas indicate the quantity of elements in molecules.
Periodic Table - History and Layout
- Mendeleev first organised the elements into a periodic table based on their properties.
- The periodic table is arranged in rows (periods) and columns (groups).
- Specific groups include alkali metals, alkaline earth metals, halogens, and noble gases.
- Periods and groups can be numbered on the periodic table.
Elements in the Periodic Table
- Elements can be identified from the periodic table using their symbols and names.
- Groups and periods can be used to find elements on the periodic table.
- Metals and non-metals can be identified using the periodic table.
- Name, symbol and atomic number can be found for an element using the periodic table.
Elements, Compounds, and Mixtures
- Elements, compounds, and mixtures can be differentiated using both images and formulas.
- Elements and compounds are represented by chemical formulas, but mixtures are not.
- Examples include elements (e.g., oxygen), compounds (e.g., water), and mixtures (e.g., air).
- Terms to define: compound, mixture.
Chemical Formulas
- Chemical formulas indicate the ratio of elements in a compound (e.g., H₂O = 2 hydrogen and 1 oxygen).
- Information about the ratio of elements is used to write chemical formulas.
- Subscripts in chemical formulas must be written correctly.
Properties of Compounds
- Elements can combine in different ratios to form different compounds (e.g., H₂O vs. H₂O₂).
- The properties of a compound differ from the properties of the elements it contains (e.g., MgO vs. Mg and O₂).
Physical Changes
- Physical changes involve changes in the arrangement of particles without changing the chemical nature of the substance.
- Examples include changes of state (solid, liquid, gas) due to heating and cooling.
Chemical Reactions
- Signs of a chemical reaction include change in color, bubbles, precipitate formation, and temperature change.
- Chemical reactions involve changes to particles.
- Chemical changes can be recognized from a description of the change in particles.
Physical vs Chemical Changes
- Physical and chemical changes can be differentiated in a given scenario.
- Definition of matter.
Practical Skills
- Properties of elements and compounds can be compared, including solubility, conductivity, melting point, boiling point, hardness, and luster.
- A simple experiment can demonstrate how elements combine to form a compound using magnesium.
- Percentages can be calculated using experimental data.
- Examples of chemical and physical changes can be named.
- Signs of a chemical reaction can be identified from experimental data.
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