BTEC Applied Science Unit One Chemistry Exam 2025 With Correct Answers

BTEC Applied Science Unit One
Chemistry Exam 2025 With Correct
Answers




How many electrons can each orbital hold? - correct answer Two
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How many electrons can be held in each sub shell? - correct answer S - 2
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P-6 l l




D - 10 l l




F - 18
l l




Put the sub shells in order do their energy, lowest to highest - correct answer S, p, d and f
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How do we fill the p and d subshells - correct answer singly first and then doubly
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What is an orbital? - correct answer A region of space around the nucleus where there is a 95% chances of
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finding an electron l l

,What is the Aufbau principle? - correct answer An electron occupies the lowest-energy orbital that can receive
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it



What happens when an electron absorbs radiation? - correct answer It moves from the ground state energy
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level to a higher energy level
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What happens when an electron moves from the higher energy levels to a lower energy level? - correct answer
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Emits radiation l




Define Ionic bonding - correct answer The electrostatic attraction between oppositely charged ions
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Where does ionic bonding occur?l - correct answer between metals and non-metal
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What is electron spin? - correct answer Electrons have two states, spin up and spin down. In an orbital each
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electron will be in a different spin state l l l l l l l




How do we form an ion? - correct answer Positive ions - cation - lose electrons
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Negative ions - anion - gains electrons l l l l l l




What is an ionic lattice? - correct answer A regular arrangement of positive and negative ions
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What does the strength of an ionic bond depend on? - correct answer Ionic change ( the higher the charge the
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stronger the electrostatic force, however this force gets weaker as the radius of the ion increases)
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Ionic radii ( the more shells the bigger the radius of the ion)
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Explain why ionic compounds are electrically neutral. - correct answer Total positive charge of cations equals
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the total negative charge of anions
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Explain why ionic compounds can conduct electricity when molten or dissolved but not when solid - correct
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answer In solids the ions cannot move l l l l l l

, In molten or dissolved states the ions are free to move and carry a current
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Why do ionic compounds have high melting and boiling points? - correct answer Because of the strong
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electrostatic attraction between ions, it takes a lot of energy to separate the positive and negative ions in a
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crystal lattice l




Why does ionic radius increase down a group? - correct answer increasing number of energy levels
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What happens to the function the ionic radius of metals across a period? - correct answer The ionic radius
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decreases for metals forming actions as the metals lose their outer elections
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What happens to the ionic radius of non metals across a period? - correct answer The ionic radius increases for
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non metals as the effective nuclear charge decreases due to the number of electrons exceeding the number of
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protons



Define covalent bond - correct answer A shared pair of electrons between two atoms
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There is a strong electrostatic attraction between the nuclei and the electrons being shared
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Where do covalent bonds form? - correct answer Between two non-metal atoms.
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How many electrons are shared between atoms in
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1. Single bonds
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2. Double bonds
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3. Triple bonds - correct answer 1. Two
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2. Four
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3. Six
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What is the relationship between home length and bond strength? - correct answer The longer the bond the
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weaker it is l l




Single bonds are longer than double or triple bonds this makes them weaker
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