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11 Nov 2019
1. What type of gas is formed when NazCOs react with an acid a. COs b. CO2 c. N20 d. NO2 2. Thousands of years ago, yeast was used to bake but the problem they encountered was: a. Sour milk was needed to make it work b. It has to be heated by itself for a long time to work c. It has to be carefully mixed with the dough to make it rise d. It needed to be kept alive for it to work 3. Evidence that a reaction has taken place when reactants react together could be a. formation of gas b. formation of fire c. formation of heat/energy d. all of the above 4. When a reaction produces fire, such a reaction is called: a. decomposition reaction b. combustion reaction c. displacement reaction d. acid-base reaction 5. How many protons does 3s2 have? b. 32 a. 18 c. 16 d. 2 6. Cations are formed when atoms: a. lose electrons b. gain electrons c. share electrons d. keep their electrons 7. The electrons in the outermost shell of atoms are called a. representative electrons b. valence electrons c. core electrons d. covalent electrons 8. Which particles play the most active role in chemical bonding? a) electrons c) neutrons b) isotopes d) protons 9. The attraction betweer positive and negative ions is known as: a) covalent bonds c) ionic bonds b) crystal bonds d) molecular bonds
1. What type of gas is formed when NazCOs react with an acid a. COs b. CO2 c. N20 d. NO2 2. Thousands of years ago, yeast was used to bake but the problem they encountered was: a. Sour milk was needed to make it work b. It has to be heated by itself for a long time to work c. It has to be carefully mixed with the dough to make it rise d. It needed to be kept alive for it to work 3. Evidence that a reaction has taken place when reactants react together could be a. formation of gas b. formation of fire c. formation of heat/energy d. all of the above 4. When a reaction produces fire, such a reaction is called: a. decomposition reaction b. combustion reaction c. displacement reaction d. acid-base reaction 5. How many protons does 3s2 have? b. 32 a. 18 c. 16 d. 2 6. Cations are formed when atoms: a. lose electrons b. gain electrons c. share electrons d. keep their electrons 7. The electrons in the outermost shell of atoms are called a. representative electrons b. valence electrons c. core electrons d. covalent electrons 8. Which particles play the most active role in chemical bonding? a) electrons c) neutrons b) isotopes d) protons 9. The attraction betweer positive and negative ions is known as: a) covalent bonds c) ionic bonds b) crystal bonds d) molecular bonds
Keith LeannonLv2
6 May 2019