Bu'aan kutaa 12ffaa ba'eera; bu'aa kee eessatti akka ilaaltu

Yaadannoo boqonnaa fi gaaffii shaakalaa

Boqonnaa 2 Keemistirii kutaa 9: Safaraafi Tooftaalee Saayinsii

Wanti fuula kana irra jiru hundi boqonnaa 2 kitaaba Keemistirii kutaa 9 tiif: wanta boqonnaan haguugu, yaadannoo gabaabaa, gaaffii shaakalaa deebii isaanii waliin, fi viidiyoo barnootaa bakka jirutti.

Google Play irraa buufadhaa
5
Kaardii
10
Gaaffii shaakalaa boqonnaa 2
19–52
Fuula kitaabaa boqonnaa 2

Boqonnaan 2 maal haguuga

  1. 1.Measurements and Units in Chemistry
  2. 2.Chemistry as Experimental Science

Yaadannoo gabaabaa boqonnaa 2

Kaardiiwwan fuula Keemistirii kutaa 9 irratti boqonnaa kana jala galmaa'an. Tokko tokkoon bani.

Yoom akka itti fayyadamtu

Yeroo laaboraatoorii keessatti eessidii fi bishaan walitti maktu fayyadami.

Of eeggadhu

Yeroo hunda eessidii gara bishaaniitti naqi malee bishaan gara eessidiitti hin naqin. Bishaan gara eessidiitti naquun hoo'a guddaa uumee eessidicha facaasa.

Grade 9 Chemistry, fuula 19-52 irraa qophaa'e; osoo hin ba'in dura yeroo lama mirkanaa'e

TK=T∘C+273.15T_{\text{K}} = T_{^\circ\text{C}} + 273.15
TKT_{\text{K}}
Hoo'ina Kelvin keessattiK\text{K}
T∘CT_{^\circ\text{C}}
Hoo'ina Celsius keessatti∘C^\circ\text{C}

Yoom akka itti fayyadamtu

Gatii temperature Celsius fi Kelvin gidduutti jijjiiruuf fayyadami.

Of eeggadhu

Ho'a Kelvin irratti mallattoo digrii hin barreessin. K qofa barreessi.

Grade 9 Chemistry, fuula 19-52 irraa qophaa'e; osoo hin ba'in dura yeroo lama mirkanaa'e

d=mVd = \frac{m}{V}
dd
Rukkinakg m−3\text{kg}\,\text{m}^{-3}
mm
Hangakg\text{kg}
VV
Qabiyyeem3\text{m}^3

Yoom akka itti fayyadamtu

Wanta tokkoof density, mass, yookiin volume shallaguuf fayyadami.

Of eeggadhu

Walsimannaa yuunitii sakatta'i. Mass gara grams fi volume gara mL yookiin cm^3 yoo ta'e g/mL yookiin g/cm^3 ta'a malee kg/m^3 miti.

Grade 9 Chemistry, fuula 19-52 irraa qophaa'e; osoo hin ba'in dura yeroo lama mirkanaa'e

Hamma Bu'uuraaMaqaa YuunitiiMallattoo
DheerinaMeetiram\text{m}
HangaKiiloogiraamiikg\text{kg}
YerooSekondiis\text{s}
Yaatoo elektirikiiAmpeeriiA\text{A}
TemprecharaKeelviiniiK\text{K}
Hamma wantooMooliimol\text{mol}
Cimina ifaaKaandeelaacd\text{cd}

Yoom akka itti fayyadamtu

Safartuuwwan fiizikaalaa bu'uuraa torban adda baasuuf yookiin ibsuuf fayyadami.

Of eeggadhu

Mass qofatu yuunitii bu'uuraa SI keessatti maxxantuu duraa (kilo- kilogram keessatti) of keessaa qaba.

Grade 9 Chemistry, fuula 19-52 irraa qophaa'e; osoo hin ba'in dura yeroo lama mirkanaa'e

Yoom akka itti fayyadamtu

Shallaggii booda deebii gara baay'ina dijitoota sirriitti maruuf fayyadami.

Of eeggadhu

Ida'uu fi hir'isuun bakka dhibbantaa isa xiqqaarratti hundaa'u. Baay'isuu fi hiruun immoo lakkoofsa hiika qaban mara keessaa isa xiqqaarratti hundaa'u.

Grade 9 Chemistry, fuula 19-52 irraa qophaa'e; osoo hin ba'in dura yeroo lama mirkanaa'e

Gaaffii shaakalaa boqonnaa 2

Gaaffii filannoo 10 boqonnaa kana irratti barreeffaman, tokkoon tokkoon isaanii deebii fi sababa qabu. Deebii banuu dura yaali. Gaaffiin kun Ingiliffaa tiin.

Gaaffii 1

Which of the following is the SI base unit used to measure the amount of a substance?

  1. A.Kilogram
  2. B.Mole
  3. C.Candela
  4. D.Ampere
Deebii fi sababa agarsiisi

Deebii: B Mole

Sababa

According to the SI base units table, the mole (mol) is the base unit for the amount of substance. Kilogram measures mass, candela measures luminous intensity, and ampere measures electrical current.

Gaaffii 2

According to laboratory safety rules, what is the correct way to mix acid and water?

  1. A.Always pour water quickly into acid
  2. B.Always pour acid into water
  3. C.Heat the acid before mixing it with water
  4. D.Add equal amounts of both at the exact same time
Deebii fi sababa agarsiisi

Deebii: B Always pour acid into water

Sababa

Always pour acid into water. Pouring water into acid can cause the acid to spatter violently out of the container.

Gaaffii 3

What is the first step in the scientific method?

  1. A.Testing the hypothesis
  2. B.Observation and formulation of a question
  3. C.Analysis and conclusion
  4. D.Writing a final laboratory report
Deebii fi sababa agarsiisi

Deebii: B Observation and formulation of a question

Sababa

The scientific method begins with observation and formulation of a question about a phenomenon in the natural world.

Gaaffii 4

In chemistry laboratory work, one liter (1 L) is equal to which of the following volumes?

  1. A.1 m3
  2. B.1 dm3
  3. C.10 cm3
  4. D.100 mL
Deebii fi sababa agarsiisi

Deebii: B 1 dm3

Sababa

A liter is a unit of volume equal to 1 cubic decimeter (1 dm3), which also equals 1000 cm3 or 1000 mL.

Gaaffii 5

How many significant figures are in the measurement 0.00420 min?

  1. A.2
  2. B.3
  3. C.5
  4. D.6
Deebii fi sababa agarsiisi

Deebii: B 3

Sababa

Zeros to the left of the first nonzero digit are not significant. The trailing zero to the right of the decimal point is significant. Therefore, only the digits 4, 2, and the last 0 are significant (3 significant figures).

Gaaffii 6

Based on standard SI metric prefixes, how many meters are in 1 Megameter (Mm)?

  1. A.1 x 103 m
  2. B.1 x 106 m
  3. C.1 x 109 m
  4. D.1 x 1012 m
Deebii fi sababa agarsiisi

Deebii: B 1 x 106 m

Sababa

The prefix Mega (M) represents a multiplying factor of 106 (1,000,000). Thus, 1 Mm = 1 x 106 m.

Gaaffii 7

A temperature reading in Adama is 25.00 °C. What is this temperature on the Kelvin scale?

  1. A.248.15 K
  2. B.298.15 K
  3. C.315.00 K
  4. D.77.00 K
Deebii fi sababa agarsiisi

Deebii: B 298.15 K

Sababa

The relationship between Celsius and Kelvin is K = °C + 273.15. Substituting 25.00 gives 25.00 + 273.15 = 298.15 K.

Gaaffii 8

A student repeats a mass measurement three times and gets values that are very close to one another, but all three values are far from the true mass. These measurements are:

  1. A.Precise but not accurate
  2. B.Accurate but not precise
  3. C.Both accurate and precise
  4. D.Neither accurate nor precise
Deebii fi sababa agarsiisi

Deebii: A Precise but not accurate

Sababa

Precision refers to the closeness of repeated measurements to each other. Accuracy refers to closeness to the true value. Getting reproducible values far from the true value means the data is precise but not accurate.

Gaaffii 9

Chaltu measured a 35.1 mL sample of an unknown solvent in the laboratory and found its mass to be 30.5 g. What is the density of this liquid?

  1. A.0.869 g/mL
  2. B.1.151 g/mL
  3. C.0.785 g/mL
  4. D.0.810 g/mL
Deebii fi sababa agarsiisi

Deebii: A 0.869 g/mL

Sababa

Density is mass divided by volume: d = m / V. Dividing 30.5 g by 35.1 mL gives 0.869 g/mL.

Gaaffii 10

A student adds two mass readings: 89.332 g + 1.1 g. According to the rules of significant figures for addition, what is the correct result?

  1. A.90.432 g
  2. B.90.43 g
  3. C.90.4 g
  4. D.90 g
Deebii fi sababa agarsiisi

Deebii: C 90.4 g

Sababa

In addition and subtraction, the result cannot have more decimal places than the starting measurement with the fewest decimal places. Because 1.1 g has only one decimal place, the sum 90.432 g is rounded to 90.4 g.

Appiin boqonnaa kana irratti gaaffii 12 qaba; utuu hojjettuu ni sirreessa. Kan asii jiran 10 jalqabaa ti.

Fuula kitaabaa boqonnaa 2

Boqonnaan 2 Maxxansa Ministeera Barnootaa keessatti fuula 19 hanga fuula 52 ti.

Maxxansa Ministeera Barnootaa, Ingiliffaa, Fuula 186

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Yaadannoo gabaabaa Keemistirii kutaa 9 hunda

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