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Questions and Answers
What is the chemical property that describes how readily a substance combines chemically with other substances?
What is the chemical property that describes how readily a substance combines chemically with other substances?
What did Rutherford's experiment demonstrate about the charge of an alpha particle?
What did Rutherford's experiment demonstrate about the charge of an alpha particle?
Which of the following is NOT an indicator of a chemical change?
Which of the following is NOT an indicator of a chemical change?
In the chemical formula $ ext{Na}_2 ext{HPO}_4$, what does the subscript '2' represent?
In the chemical formula $ ext{Na}_2 ext{HPO}_4$, what does the subscript '2' represent?
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Why did Rutherford's experiment involve using gold foil?
Why did Rutherford's experiment involve using gold foil?
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How did Rutherford conclude that atoms are mostly empty space?
How did Rutherford conclude that atoms are mostly empty space?
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Which of the following is a compound?
Which of the following is a compound?
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What is the coefficient in the chemical formula $3 ext{H}_2 ext{O}$?
What is the coefficient in the chemical formula $3 ext{H}_2 ext{O}$?
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What was the primary outcome when alpha particles hit the gold foil in Rutherford's experiment?
What was the primary outcome when alpha particles hit the gold foil in Rutherford's experiment?
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Which of the following is a physical property of a substance?
Which of the following is a physical property of a substance?
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How did Rutherford deduce that the nucleus of an atom is positively charged?
How did Rutherford deduce that the nucleus of an atom is positively charged?
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In Niels Bohr's model of the atom, electrons move around the nucleus like planets around the sun. What determines how many electrons can occupy each energy level?
In Niels Bohr's model of the atom, electrons move around the nucleus like planets around the sun. What determines how many electrons can occupy each energy level?
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What property describes non-metals that causes them to break easily?
What property describes non-metals that causes them to break easily?
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Which non-metal is described as the most reactive in its group?
Which non-metal is described as the most reactive in its group?
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Which of the following properties do metalloids share with metals?
Which of the following properties do metalloids share with metals?
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What is the significance of elements in the same group having the same number of valence electrons?
What is the significance of elements in the same group having the same number of valence electrons?
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Which property distinguishes metalloids from non-metals?
Which property distinguishes metalloids from non-metals?
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Which of the following is true about elements in the first period of the periodic table?
Which of the following is true about elements in the first period of the periodic table?
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What is the key difference between a compound and a mixture?
What is the key difference between a compound and a mixture?
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Which of the following is a uniform mixture, also known as a solution?
Which of the following is a uniform mixture, also known as a solution?
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Which diagram represents a pure element?
Which diagram represents a pure element?
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Which of the following is classified as a compound?
Which of the following is classified as a compound?
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Which diagram represents a mixture of two compounds?
Which diagram represents a mixture of two compounds?
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Which of the following is classified as a mixture?
Which of the following is classified as a mixture?
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What is the atomic number of Bromine?
What is the atomic number of Bromine?
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According to Dalton's Atomic Theory, which of the following statements is true?
According to Dalton's Atomic Theory, which of the following statements is true?
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Which subatomic particle is located in the nucleus of an atom?
Which subatomic particle is located in the nucleus of an atom?
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Which model of the atom suggested the existence of a positively charged nucleus?
Which model of the atom suggested the existence of a positively charged nucleus?
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What is the symbol for the element Tungsten?
What is the symbol for the element Tungsten?
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Which statement best describes the electron cloud in the modern Quantum Model of the atom?
Which statement best describes the electron cloud in the modern Quantum Model of the atom?
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Study Notes
Chemical Properties and Reactions
- A substance's ability to combine chemically with other substances is described by its reactivity.
- Rutherford's experiment demonstrated that alpha particles have a positive charge.
Chemical Formulae
- In the chemical formula Na₂HPO₄, the subscript '2' represents the number of sodium atoms present.
- The coefficient in the chemical formula 3H₂O represents the number of molecules of water present.
Atomic Structure
- Rutherford's experiment involved using gold foil to demonstrate that atoms are mostly empty space.
- Rutherford concluded that atoms are mostly empty space because most alpha particles passed through the gold foil without being deflected.
- Rutherford deduced that the nucleus of an atom is positively charged because the alpha particles were deflected by the positive charge.
Compounds and Mixtures
- A compound is a substance formed by the chemical combination of two or more different elements.
- The key difference between a compound and a mixture is that the components of a compound are chemically bonded, whereas the components of a mixture are not.
- A uniform mixture, also known as a solution, is a type of mixture in which the components are evenly distributed.
Periodic Table
- Elements in the same group have the same number of valence electrons.
- Elements in the first period of the periodic table have a specific number of valence electrons.
Properties of Elements
- Non-metals are typically brittle and break easily.
- Metalloids share some properties with metals, but not all.
- The most reactive non-metal in its group is fluorine.
Atomic Models
- Niels Bohr's model of the atom suggests that electrons move around the nucleus like planets around the sun.
- The modern Quantum Model of the atom features an electron cloud, which is a region where electrons are likely to be found.
Atomic Theory
- According to Dalton's Atomic Theory, elements are composed of small, indivisible particles called atoms.
- The atomic number of bromine is 35.
- The symbol for the element tungsten is W.
- The nucleus of an atom contains protons and neutrons.
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Description
Prepare for your Grade 9 Chemistry class at Windsor Park Collegiate by mastering the periodic table elements and their symbols. Test your knowledge on elements such as Hydrogen, Oxygen, Sodium, and more!
