Chemical Equations & Reactions

" The crucible and its contents were thus measured and the throng recorded.

a) mass of empty crucible =53.200g

b) mass of crucible plus 2g Mg =55.200g

c) mass of crucible plus "unknown" product

d) mass of "unknown" product after warmth = 3.316g

2. Where did the extra mass come from? The extra mass came

3. The balance equation for the synthesis reaction that occurred is:

2Mg (s) + 02 (g) ? 2MgO (s) (The Reactivity, 2005)

To a 150 mL Erlenmeyer flaskful was added 5g pig (II) carbonate hydroxide hydrate (Cu2CO3(OH)2* weewee, and the flask and contents weighed. The flask was vexed with a Bunsen burner until the green entangled turned dispirited. The flask was then removed from the heat and the mass of the flask and its contents determined.

molecular(a) weight of Cu2Co3(OH)2 =221.116g

Molecular weight of H2O = 18.015g

Weight of flask and contents after heating =

1. A hydrate is a compound that has body of water molecules attached to it by electrostatic forces, and these water molecules are released when the compound is heated (Gormley, 2004). The formula of copper carbonate hydroxide hydrate, Cu2CO3(OH)2*H2O has one water molecule bound to each copper carbonate hydroxide molecule.

From the ratio of the mass of the blac

k product to the initial 5g copper carbonate hydroxide hydrate placed in the flask, the remaining black compound could be the anhydrous copper carbonate hydroxide.

15 mL of sodium hydroxide (NaOH) was added to one 50 mL beaker and 6 mL nickel (II) chloride was added to another 50 mL beaker. The two solutions were observed and then the entire contents on one beaker were poured into the other, and observations made.

then there is a reaction with group O:

1. The ions present in the aqueous solution of Naoh were:

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