Question 1
Question
What is chemistry?
Answer
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Chemistry is the central science that connects Physics to Biology
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Chemistry is the science that represents the world through math
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Chemistry is the science that describes all living things
Question 2
Question
Bucky balls are carbon lattice structures that contain [blank_start]______[blank_end] carbons.
Question 3
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The IUPAC is an organization that regulates the physical laws of chemistry.
Question 4
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Chemistry is the study of [blank_start]_________[blank_end] and its interactions.
Question 5
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Around [blank_start]_______[blank_end], early Greek philosophers argued that [blank_start]_________[blank_end] could be subdivided into tiny indivisible particles called [blank_start]_________[blank_end].
Answer
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400 BCE
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matter
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atomos
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200 BCE
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protons
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quarks
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atomns
Question 6
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Democritus stated that atoms have different sizes, are never in motion and are separated by empty space.
Question 7
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In around the 17th century, alchemists explored the nature of matter intensely. They searched for exclusive prizes such as the alchemy of life.
Question 8
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Dalton proposed that...
- all mater is made up of tiny [blank_start]indivisible particles[blank_end] called [blank_start]atoms[blank_end]
- all atoms of the of an element are [blank_start]identical[blank_end]
- atoms of different elements are [blank_start]different[blank_end]
- atoms are rearranged from [blank_start]new substances[blank_end] in chemical reactions, but they are never created nor [blank_start]destroyed[blank_end].
Answer
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indivisible particles
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atoms
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identical
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different
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new substances
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destroyed
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atoms
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indivisible particles
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identical
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different
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identical
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new substances
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indivisible particles
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different
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different
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identical
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indivisible particles
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new substances
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atoms
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energy
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destroyed
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bombarded
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constructed
Question 9
Question
Thompson created the [blank_start]plum pudding model[blank_end] from his experiment with a cathode ray and as a result discovered [blank_start]electrons[blank_end]. Ernest Rutherford performed the [blank_start]gold foil experiment[blank_end] and from this he deduced that there was a [blank_start]positively charged nucleus[blank_end]. Chadwick discovered the [blank_start]neutral neutron[blank_end] and Bohr proposed energy levels from his observation of photon emission.
Question 10
Question
Bohr Rutherford diagrams look as follows.
Question 11
Question
Z represents the [blank_start]atomic number[blank_end]. A represents the [blank_start]atomic mass[blank_end]. X represents the [blank_start]element symbol[blank_end].
Answer
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atomic number
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atomic mass
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element symbol
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atomic mass
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atomic number
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element symbol
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element symbol
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atomic number
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atomic mass
Question 12
Question
Valence electron are electron on the second outermost shell.
Question 13
Question
All atoms are in the search of a full octet to some extent.
Question 14
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Noble gases are highly reactive as they constantly search to fill their octet.
Question 15
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Ions are formed when...
Answer
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there is a loss or gain of electron
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a nuclear fusion event occurs
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a nuclear fission event occurs
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an atoms is bombarded with protons
Question 16
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Positive ions are [blank_start]cations[blank_end] and negative ions are [blank_start]anions[blank_end].
Question 17
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Anions and Cations come together to form a molecular compound.
Question 18
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Element with multiple ion charges...
Question 19
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Polyatomic ions are ions that consist of more than one atom.
Question 20
Question
Magnesium ion [blank_start]Na^(2+)[blank_end], Sodium ion [blank_start]Na^(+)[blank_end], Ammonium [blank_start]NH4^(+)[blank_end], Sulphate [blank_start]SO4^(2-)[blank_end], Chlorate [blank_start]ClO3^(-)[blank_end], Carbonate [blank_start]CO3^(2-)[blank_end], Phosphate [blank_start]PO4^(3-)[blank_end], Cyanide [blank_start]CN^(-)[blank_end], Hydroxide [blank_start]OH^(-)[blank_end], Bicarbonate [blank_start]HCO3^(-)[blank_end], Nitrate [blank_start]NO3^(-)[blank_end]
Answer
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Mg^(2+)
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Na^(+)
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NH4^(+)
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SO4^(2-)
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ClO3^(-)
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PO4^(3-)
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CO3^(2-)
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CN^(-)
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OH^(-)
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HCO3^(-)
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NO3^(-)
Question 21
Question
99% of the human body is made of only 6 elements (oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus).
Question 22
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Isotopes are atoms of the same element that have different numbers of protons.
Question 23
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How are isotopes distinguished?
Answer
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atomic mass
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number of protons
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charge
Question 24
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Isotopic abundance is the percentage of an isotope in a sample of an element.
Question 25
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What do scientists use to find the isotopic abundance of a given isotope?
Question 26
Question
Alpha particles have the same structure as a [blank_start]helium atom nucleus[blank_end] and can be blocked by [blank_start]paper[blank_end]. Beta particles are [blank_start]negatively charged electrons[blank_end] that can pass through paper but not through [blank_start]aluminium[blank_end]. [blank_start]Gamma rays[blank_end] are a high-energy electromagnetic radiation but it cannot pass through [blank_start]lead[blank_end].
Question 27
Question
Radioactive isotopes are isotopes that decay to form nuclear radiation.
Question 28
Question
Element X has isotopes X-200 (80%) and X-201(20%),. Calculate the atomic mass of element X.[blank_start]________[blank_end] amu
Question 29
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The periodic table contains almost all of the known elements.
Question 30
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Hydrogen does not belong to a specific group of elements as it is an exception.
Question 31
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What are the properties of alkali metals?
Answer
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Soft, sliver coloured element that is solid at room temperature and is highly reactive with water
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Light, very reactive metal that is solid at room temperature and reacts with oxygen to form oxides
Question 32
Question
Transition metals are the metals that are found near the center of the periodic table. They are strong , hard metals with high melting points as well as good conductors of electricity. Many react with oxygen to form oxides. Some are multivalent.
Question 33
Question
Metalloids are found along the staircase.
Question 34
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Transuranic metals are those that have an atomic number greater then [blank_start]_________[blank_end].
Question 35
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Noble gases are gases at room temperature with high melting and boiling points. They are extremely unreactive.
Question 36
Question
Halogens may be solid liquid or gas at room temperatures and are extremely reactive. They also exhibit non-metallic properties such as no lustre and non-conduction.