1) Covalent bonds are usually formed between which type of atom? a) Metal and metal b) Metal and non-metal c) Non-metal and non-metal 2) How are electrons arranged in a covalent bond? a) By sharing pairs of electrons between two atoms b) By transferring electrons to form oppositely charged ions c) By delocalising outer electrons in a lattice of positive ions 3) What does this diagram of hydrogen chloride show about the bond being formed? a) The atoms share all eight electrons, one from the hydrogen atom and seven from the chlorine atom b) The bond is formed by sharing a pair of electrons, one from the hydrogen atom and one from the chlorine atom c) An electron is transferred from the hydrogen atom onto the chlorine atom to form ions 4) How many covalent bonds will phosphorous (in group 5) usually form? a) 1 b) 2 c) 3 d) 4 e) 5 f) 6 5) Which of the following have molecules which are held together by three covalent bonds? a) Water - H2O b) Carbon dioxide - CO2 c) Ammonia - NH3 6) How many atoms are in a molecule of methane? a) Two b) Four c) Five 7) How many shared pairs of electrons are there in a water molecule, formula H2O? a) Two b) One c) Three 8) How can you (usually) determine how many bonds will form for an element? a) the number of missing electrons to get 8 b) the total number of valence electrons c) the number of protons 9) How many electrons form a covalent double bond? a) 1 b) 2 c) 4 d) 6 10) How many pair(s) of electrons form a covalent double bond? a) 1 b) 2 c) 4 d) 6 11) How many covalent bonds does carbon usually form? a) 1 b) 2 c) 3 d) 4 e) 5 f) 6 12) Which is the correct dot-cross diagram for ethene? C2H4? a) A b) B c) C d) D 13) Which atom usually goes in the middle and why? a) Carbon b) The halogens (F, Cl, Br) c) Nitrogen d) because it can make the most bonds e) because they are the most reactive elements f) because it has a lone pair of electrons 14) What are some common mistakes students forget to do when drawing dot-cross diagrams? a) forgetting the lone pairs (electrons that aren't bonding) b) forgetting to use both dot and crosses c) Nothing, I am perfect. d) not knowing how many valence electrons are in each atom e) forgetting to make double bonds! f) not knowing which atom goes in the middle 15) Students tend to draw this for their exam when they don't practice drawing dot-crosses in class. What is wrong with this student's drawing? a) They used X and Os when it should be a dot b) They used two of the same elements, when it should be different elements c) They used too little Xs d) The chlorine atoms don't have a full outer shell! e) The chlorine atoms look way too chill.

Y10 iG Chem U8 - Simple Covalent Bonds Concept Check

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