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證育(CM
·育教 日五廿月九年未辛
代武胜保險
明德出版社出
MILL & DALE PRESS
Accounting (4)
account, this will be the balance
to be brought down:-.
報日僑華
Mr. No. Debit
20/1/89 Sales
200 25/2/89 Casn
200
(c) When having more than one entry, to
balance off the account needs to. ̇compare the two sides total first before bringing down 'the balance to the side having the greater total. *Debit Balance
̇五期星 白一月一十(一九九一)年十八國民華中( 30 )
It serves to be a summary and a list of all balances of accounts in the Jedger... Since the double entry system is employed, it follows that ̇the total of the debit balance must. be equal to the total of the credit balance. 'tf such equality is maintained, the trial balance is to
·ensure that each transaction is. accurately: posted as it appears. It is not, however, free of errors.:
the tria?......balance is Also, convenient means to prepare trading and profit and loss account, and balance sheet.
*Debit Balance
Mr. Debtor
1992 中學會考預習專欄
$
30/1/89.Sele
9/2789 Balance bld.
100| 31/1/09 Balance.c/d 100
100
Motor Van
3/1189 Bank
500 31/1/89 Balance cre 500
Cashi
1
-1/2/69 Balance via .500.
M. T. Kwok
1/1/69Capital 15/1/89Bank Loen
*Credit Balance
Mr.Creditor
1/2/89Batance b/d
1,500
900
1,000 3/1/69Motor Yan 500|10/1/asPurchases
31/1/898al anco c/d 900 1,500
400
200
(b) Form of Trial Balance
31/1/89 Balance / 700 25/1/89 Purchases.
700
1/2/89 Balance b/d 700
*Credit Balance
Capital..
31/9/898atance c/d 5,000/1/1/89 Book
Balancing off Accounts. and the Preparation of a Trial Balance.
(1) Balancing Off Accountss-
After making all the necessary. entries into the relevant sides of the accounts (this will cover and complete the posting procedures from day books to the ledger accounts),
we
periodically balance off the account in. order to get the differences (balances) between the debit side total and the credit side: total. These may: be illustrated by the following examples; - (a) When having only one entry in the
1992 中學會考預習專欄
明德出版社
"MILL & DALE PRESS
Chemistry(4)
Question 2.1.
1/2/89 Balance b/d 5,000
Examples:-
a
Trial Balance as at 31st December 1988
Name of Accounts
Debit
Credit
$
$
Capital:
5,000
Building
7,000
31/1/09 Balance c/d
400 15/1/89 Cesh
20/1/89 Mr. D
Debtors(*)
2,000
Purchases:
3,000
5,000
Sales
4,000
7/2/69 Balance bad 400
Expenses
2,000
Stock.
500
Creditors(*好
5,500
14.500
14,500
solution when blue crystals start: to appear on the glass rod cooling?
On
(b) When having equal amount entries on both sides, the accounts: will have no balance..
bubbles are seen, but the reaction rapidly stops:
Question 2.2
hydrogen
In the experiment below, chloride gas is generated ane dissolved in liquid W.
Liquid:2
HÀ LAN
Sodług
chlor: Ide
(a) write an ionic equation, giving the crystals
physical states of the substancesi
of each of the following reactions.
(1) Drop a lump
of
calcium
carbonate to some dilute hydrochloric acid.
(2) Add a piece of zinc granules to
some dilute sulphuric acid:
Some Supreme
(3) Heat a mixture of ammonium
sulphate piece of
and calcium hydroxide....
【4】:Add:a moderately concentrated potassium. hydroxide and warm the mixture.
of aluminium into
(5) Add, at first, a few drops of
sodium hydroxide solution into some
zinc(111) chloride solution and then an excess' of sodfum hydroxide.
(6) Add powdered copper(II)
hydroxide to some dilute sulphuric acid.
(b) Explain briefly, with the help of equations of each observations below:
(1) There is not any gas evolved when a copper tunning is added to dilute sulphuric acid. However, tien copper is added to some 'df Tute nitric acid, a reddish brown gas is observed.
(2) When
calcium tump carbonate is added to, some dilutė.
salphuric acid, at first, a few gas.
康樂 544 1931
(a) Name the liquid Z.
Liquid
Write an equation of the furination of hydrogen chloride in the abawg. experiment.
(b) Why is an inverted funnel used
瀑
A solution X is obtained when, is water and a solution Y is obtained when is melthy lebenzene. Several tests are performed on the solutions X and Y separately and the results are tabulated as below.
Tests
¡Place a přesp) Bar dry ph Jpaper in 14.
| Put a place
of magnes Fin
Ibbon to
JI Add caletum
Icarbonate to.
1V Pass ammonia
Solution Y
Solution X
No colour change
pH paper. turns red.
A colourlessi No gas
gai Ais
evolved
which forms
an explosive
mixture with;
alfi
bubbles.
Gas bubbles. No gas
bubbles.
A colourless
gas B 16.
avolved.
fio obvious
gas Into Itchenge.
7706155
龍祥(3樓)
牌照號碼:240470
薄利多銷
White solid.
C is seen
atthe
bottom.
(2) Preparation of a Trial Balance: (a) Furiction of a Trial Balance:
(c) Name the substances A,B and C.
equations of the (d) Write iònte
and 111 reactions in Tests II respectively.
{e} Explain the changes observed in-
Test L.
(f) Explain the result observed in Test
IV.
Question 2.3
|Malachite is a green mineral having a | chemical formula GuCOy*Cu(OH)2. Given below is the procedure for preparing some blue crystals using the malachite l as the starting ma
1. Half-fi-11 a beaken with dilute. sulphuric acid.anya 3 PA 2. Add powdered malachite, stir constantly and add more malachite until some of the solid remains undissolved.
3. Filter. But the filtrate in cam evaporating dish and heat is over a water bath.
4. At intervals, dip.a glass of into the hot filtrate, takevit out and allow it to cool. Repeat until small blue crystals start to appear at once the glass rod
cooling.ating
Con
the.
5. Stop heating and allow solution in the evaporating dish to coolBlue crystals are formed. 6. Filter off the crystals, wash them 2 to 3 times with a small amount of cold distilled water and: then press the crystals gently between filter papers.
{a} What type of sait is the malacnite? (b) Name the blue crystals obtained.
dilute
(c). What would you observe on adding
the malachite to the sulphuric acid?
Write an equation of the reaction between the malachite and dilute sulphuric acid.
(d). Why has an excess of the malachite
to be added?
(e) What is the purpose of heating the
filtrate over a water bath?
(F) What does it indicate of
ioes it indi
the
(g) How wound. the rate of capling of the solution affect the :blue -crystals obtained?
(h) Why are the crystals washed with distilled water? Why is cold water " preferred to?
(1) What is the purpose of pressing the
: crystals between filter papers?.
到
Solution to Question 2.1
(a) (1) CaCO2(s)+2H+(aq)--Ca2
(b)
+(aq) + H20{0}}
+C02(g)
(2) Zn(s)+2H+(aq) →Zn2+(aq)+H2(g)
(3) (NH4)2S04(s)+Ca(OH),($)
→2NH2{g)+Ca50 {s)+2H20(#) (4):A1{s}+20H ̄(aq)+2H2O{0}: -
Al(OH), (aq)+H2(9)
{5} Zo2+(aq)+20H ̄(aq)~~Zn{DH}2{s}
zn{Qfr)+20N (aq)-Zn(OH)2(aq) (6) Gu(OH)_{s}+2H*(aq) →→Ca2+(aq}
*+2H20(2)
(1) Copper is betőw hydrogen in the Activity Series, so, it cannot displace hydrogen from the acid: Dilute nitric acid is an oxidizing. agent: Itfoxidizes/copper and ts itself reduced to nitrogen (IV) oxide which is the brown gas.
Cui4HNO3 + Cu(NOg)2+2H2O+2NOz
(2) Calcium sulphate is formed on the surface of the Jump of calcium carbonate when storeacts with dilute sulphuric acid. Stnce calcium sulphate is only slightly soluble. in water so, it forms an insoluble coat on the lump, thus preventing any further reaction.
Solution to question. 2.2
(a) Z is concentrated sulphuric acid.
Nac)+6
NaHSO+HC1
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* The total of all debtors or creditors will be presented instead of listing all individual debtors or creditors.
(c) Common mistakes in preparing Trial
Balance
1f after listing all balances anto the trial balance and the total amount of debit and credit can't
the it agree,
reveals
·existence of some mistakes in:- (1) missing some balances
certain accounts;.or
(2) calculation; or
day
(3) forgetting to post some
book: figures to the ledger accounts.
(4) accounting errors.
However, even the totals agreed, we still may have errors. Such errors (ife. errors not affecting trial balance) and the accounting: errors mentioned
errors above (i.e. affecting the trial balance) will be discussed
the under
topic correction of errors.
(b) The Inverted funnel is to prevent,
"sucking back"
of the solutian
because HCT is very soluble in Liquid W...
(c) A is hydrogen gas.
B is carbon dioxide.
C1saipmonium chloride.
(d) Test II:"
Mg(s)+2H*(aq) → Mg2+(aq) +Hg (g) Test III:
̇CaCO3(sl+2H* (aq)
-Ca?+(aq}+H2O(p}+CO2(g)
(e) Water is a polar solvent. When HCT dissolves in water, 'it ionizes to give hydronium ions (10) which are responsible for the acidicity Thus, solution X can turn the pH paper red.
(f) Armonium chloride islan ionic solid, so, it is dissolved in water but not in methylbenzene which is a non-polar solvent.
Soultion to Question 2.3
(a) Malachite is a basic salt.
(b) Copper(II) sulphate crystals. (c) The solid dissolves and gas bubbles. are seen. A blue solution is formed.
CuCOg•Cu(OH)2+2HyS0g→2CuSOq+2H2O+CO2
(d) This is to assure that all the
: dilute sulphuric acid isureacted.. (e) This is to concentrate the solution.
by evaporating off some water. (f) It indicates that the hot solution. has become saturated with the solute..
(g) Quick cooling would give small crystals while slow cooling would give larger crystals.
(h) Washing the crystals is to remove any solution or impunities on the crystals.
Cold water is used in order to dissolution of the reduce the
crystal's in water
(1) This is to dry the wet crystals.
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