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Đề Kiểm Tra Khoa Học Tự Nhiên 8

Total questions: 152

Worksheet time: 5hrs 1mins

Name
Class
Date
1.

Mục đích của các công cụ và thiết bị được sử dụng trong Khoa học Tự nhiên 8 là gì?

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2.

Phản ứng hóa học trong Chủ đề 1 là gì?

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3.

Các tính chất của Axit, Bazơ, pH, Oxit và Muối là gì?

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4.

What is the significance of the force's rotational effect?

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5.

Các công cụ và hóa chất nào được sử dụng trong việc giảng dạy Khoa học Tự nhiên lớp 8?

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6.

Khái niệm về sự thay đổi vật lý và sự thay đổi hóa học là gì?

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7.

Khái niệm về phản ứng hóa học, chất phản ứng và sản phẩm là gì?

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8.

Các sắp xếp khác nhau của các nguyên tử trong các chất phản ứng và sản phẩm là gì?

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9.

Khái niệm về phản ứng tỏa nhiệt và phản ứng thu nhiệt là gì?

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10.

State the law of conservation of mass.

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11.

Khái niệm về phương trình hóa học là gì và các bước để viết một phương trình hóa học?

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12.

Khái niệm về mol (nguyên tử, phân tử) là gì?

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13.

Khái niệm về mật độ là gì và làm thế nào để tính mật độ của một khí?

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14.

Khái niệm về thể tích mol của một khí ở 1 bar và 25 độ C là gì?

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15.

Khái niệm về hiệu suất phản ứng là gì?

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16.

What is a solution?

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17.

What is the definition of solubility, percentage concentration, and molarity?

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18.

Trình bày các ứng dụng phổ biến của phản ứng tỏa nhiệt (đốt than, xăng, dầu).

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19.

Giải thích tầm quan trọng của một phương trình hóa học.

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20.

Phân biệt giữa sự thay đổi vật lý và sự thay đổi hóa học. Cung cấp ví dụ về sự thay đổi vật lý và sự thay đổi hóa học.

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21.

Thực hiện một số thí nghiệm về sự thay đổi vật lý và sự thay đổi hóa học.

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22.

Identify some signs that indicate a chemical reaction has occurred.

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23.

Cung cấp một ví dụ minh họa cho các phản ứng tỏa nhiệt và thu nhiệt.

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24.

Chứng minh rằng khối lượng được bảo toàn trong một phản ứng hóa học.

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25.

Tính toán lượng chất trong một phương trình hóa học dựa trên số mol, khối lượng hoặc thể tích ở 1 bar và 25°C.

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26.

Tạo một sơ đồ của một phản ứng hóa học dưới dạng từ ngữ và phương trình hóa học (sử dụng công thức hóa học) cho các phản ứng hóa học cụ thể.

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27.

Tính khối lượng mol (M); Chuyển đổi giữa số mol (n) và khối lượng (m).

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28.

So sánh xem khí này nặng hơn hay nhẹ hơn một khí khác dựa trên công thức mật độ.

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29.

Sử dụng công thức để chuyển đổi giữa số mol và thể tích khí ở điều kiện tiêu chuẩn: áp suất 1 bar ở 25°C.

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30.

Tính độ tan, nồng độ phần trăm; molarity theo công thức.

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31.

Tính toán hiệu suất của một phản ứng dựa trên sản lượng lý thuyết và sản lượng thực tế.

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32.

Tiến hành một thí nghiệm để chuẩn bị một dung dịch có nồng độ nhất định.

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33.

Tiến hành một thí nghiệm và quan sát thực tế: So sánh tốc độ của một số phản ứng hóa học; Nêu các yếu tố thay đổi tốc độ phản ứng.

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34.

Trình bày khái niệm về axit (sản xuất ion H+).

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35.

Các yếu tố nào thay đổi tốc độ phản ứng?

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36.

Định nghĩa axit và cung cấp một ví dụ.

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37.

Định nghĩa cơ sở và cung cấp một ví dụ.

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38.

Thang pH là gì và nó được sử dụng như thế nào?

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39.

What is an oxide?

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40.

Các ứng dụng phổ biến của axit là gì?

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41.

Phương trình hóa học cho phản ứng của axit hydrochloric là gì?

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42.

Làm thế nào để xác định xem một hydroxide có tan hay không?

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43.

Phương trình hóa học cho phản ứng của một bazơ với một axit là gì?

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44.

Phương trình hóa học cho phản ứng của oxit kim loại với axit là gì?

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45.

Phương trình hóa học cho phản ứng của oxit phi kim với bazơ là gì?

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46.

Làm thế nào để đo pH trong thực phẩm?

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47.

Viết phương trình hóa học cho sự hình thành một oxit từ một kim loại.

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48.

Phân loại oxit dựa trên độ phản ứng của chúng với axit và bazơ.

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49.

pH có mối liên hệ như thế nào với dạ dày, máu, nước mưa và đất?

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50.

Định nghĩa của pH trong dạ dày, máu, nước mưa và đất là gì?

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51.

What is the concept of salt?

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52.

What are some common salts and their properties?

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53.

What are the basic components and effects of some chemical fertilizers on crops?

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54.

What are some methods for preparing salts?

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55.

What is the relationship between acid, base, oxide, and salt?

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56.

What is the role of fertilizers in providing essential nutrients to soil and crops?

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57.

What is the impact of using chemical fertilizers incorrectly on the environment?

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58.

What measures can be proposed to reduce fertilizer pollution?

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59.

What is the definition of specific gravity?

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60.

What is the effect of liquid on an object placed in it?

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61.

What is pressure?

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62.

What is the relationship between pressure, force, and area?

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63.

What are the conditions for floating and sinking objects?

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64.

What is the definition of density?

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65.

What are some common units of measurement for density?

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66.

What is the Archimedes' principle?

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67.

What is the effect of atmospheric pressure?

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68.

What is the moment of force?

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69.

What is the lever?

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70.

When using chemicals, we need to

a)

smell and taste the chemicals

b)

use our hands to directly touch the chemicals

c)

after taking the chemicals, we need to tightly close the containers

d)

pour the chemicals directly into the drainage or dispose of them into the environment

71.

Among the types of reactions: rusting of metals, photosynthesis, thermal decomposition, combustion. How many of these reactions require energy supply during the reaction process?

a)

1

b)

2

c)

3

d)

4

72.

A chemical reaction is

a)

the process of combining elements into compounds

b)

the process of transforming one substance into another

c)

the exchange of two or more initial substances to create a new substance

d)

the process of decomposing the initial substance into many new substances

73.

The base solution turns litmus paper blue. What color does it change to?

a)

Blue

b)

Red

c)

Purple

d)

Yellow

74.

Fill in the blank: "Acids are those ... in the molecule that have ... bonded to the acid group. When dissolved in water, acids produce the ion ..."

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75.

Fill in the blank: "Acid are ... in the molecule with ... atom linked to the acid group. When dissolved in water, acids produce ion ..."

a)

Elements, hydrogen, OH−.

b)

Compounds, hydroxide, H+.

c)

Elements, hydroxide, OH−.

d)

Compounds, hydrogen, H+.

76.

What is the chemical formula of acid found in gastric juice?

a)

CH3COOH.

b)

H2SO4.

c)

HNO3.

d)

HCl.

77.

In the salts NaCl, CaCO3, KNO3, BaSO4, CuSO4, AgCl, MgCO3, how many salts are soluble in water?

a)

3.

b)

4.

c)

5.

d)

6.

78.

What is the name of the salt of hydrochloric acid?

a)

Chloride salt.

b)

Phosphate salt.

c)

Carbonate salt.

d)

Sulfate salt.

79.

Which of the following is a salt?

a)

K2O.

b)

HCl.

c)

K2SO4.

d)

H2SO4.

80.

Which salt does not dissolve in water?

a)

KCl.

b)

NaCl.

c)

AgCl.

d)

CuCl2.

81.

Which statement is correct?

a)

All carbonate salts are soluble.

b)

All salts of metals K, Na are soluble.

c)

All salts of metals Cu, Ag are soluble.

d)

All sulfate salts are insoluble.

82.

Chemical fertilizers are chemicals that contain:

a)

nutrients necessary for plants.

b)

nitrogen and some other elements.

c)

phosphorus and some other elements.

d)

potassium and some other elements.

83.

Chemical fertilizers are divided into types:

a)

macro, micro, trace.

b)

macro, micro, medium.

c)

macro, medium, micro.

d)

medium, micro, single.

84.

Which nutrient is not contained in macro fertilizers?

a)

N.

b)

P.

c)

S.

d)

K.

85.

What is the chemical formula of Urea?

a)

NH4NO3.

b)

NH4Cl.

c)

(NH2)2CO.

d)

(NH4)2SO4.

86.

What element does nitrogen fertilizer provide for plants?

a)

P.

b)

K.

c)

N.

d)

Ca.

87.

What is the relationship between mass m and volume V?

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88.

What is chemical fertilizer?

a)

NH4NO3

b)

NH4Cl

c)

(NH2)2CO

d)

(NH4)2SO4

89.

What element does nitrogen fertilizer provide for crops?

a)

P

b)

K

c)

N

d)

Ca

90.

What is the formula relating mass m, volume V, and density D of an object?

a)

D = m.V

b)

m = D.V

c)

V = m.D

d)

m = D/V

91.

What is the unit of pressure?

a)

N

b)

Pa

c)

m/s

d)

kg

92.

What is pressure?

a)

Force applied perpendicular to the surface being pressed.

b)

Force applied parallel to the surface being pressed.

c)

Force applied at any angle to the surface being pressed.

d)

Force applied coinciding with the surface being pressed.

93.

What is the relationship between pressure F, area S, and pressure p?

a)

p = F.S

b)

S = p.F

c)

p = F/S

d)

F = p/S

94.

Pressure at a point in a liquid depends on what?

a)

It increases with the depth of the liquid from that point to the surface.

b)

It increases with the decrease in depth of the liquid from that point to the surface.

c)

It does not depend on the depth of the liquid compared to the surface.

d)

It only depends on the nature of the liquid.

95.

What happens to pressure when?

a)

Area S is constant, pressure applied on area S increases.

b)

Area S increases, pressure applied on area S is constant.

c)

Area S is constant, pressure applied on area S decreases.

d)

If pressure increases by a certain amount, area S also increases by the same amount.

96.

Why does a life jacket not sink in water?

a)

Because the mass of the life jacket is less than the mass of water.

b)

Because the density of the life jacket is less than the density of water.

c)

Because the life jacket is light.

d)

Because the volume of the life jacket is greater than that of water.

97.

The magnitude of Archimedes' force depends on what?

a)

The amount of liquid in the tank and the mass of the object.

b)

The volume of the liquid displaced by the object and the nature of the liquid.

c)

The depth of the object submerged compared to the bottom of the tank.

d)
98.

What does the magnitude depend on?

a)

The amount of liquid in the jar and the mass of the object.

b)

The volume of the liquid displaced by the object and the nature of the liquid.

c)

The depth of the submerged object compared to the bottom of the jar.

d)

The density of the object.

99.

In which case will the object rotate?

a)

Using a knife to cut a birthday cake.

b)

Using hands to open the faucet lever.

c)

Using hands to swipe the phone screen.

d)

Using a hammer to nail into the wall.

100.

The moment of a force with respect to an axis is characterized by?

a)

The pulling effect of the force.

b)

The compressive effect of the force.

c)

The bending effect of the force.

d)

The rotating effect of the force.

101.

What is the axis of rotation of the scissors when used for cutting?

a)

The tip of the scissors.

b)

The blade of the scissors.

c)

The handle.

d)

The screw that connects the two blades.

102.

Which of the following is an application of the lever?

a)

Nail clippers.

b)

Pushing a car up a ramp.

c)

The wheel at the top of the flagpole.

d)

The slide.

103.

Calculate the efficiency of the reaction?

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104.

Write the formula to determine the density of a substance? Explain the significance of each variable in the formula?

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105.

Explain why rubbing a glass rod with silk makes the glass rod positively charged while the silk becomes negatively charged?

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106.

What does the percentage concentration of a solution tell us?

a)

The number of moles of solute in one liter of solution.

b)

The number of moles of solute in 150 grams of solution.

c)

The number of grams of solute in 100 grams of solution.

d)

The number of grams of solute in the solution.

107.

What is the substance formed after a chemical reaction?

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108.

What is the number of moles of solute in 150 grams of solution?

a)

Number of moles of solute in 150 grams of solution.

b)

Number of grams of solute in 100 grams of solution.

c)

Number of grams of solute in the solution.

d)

Number of grams of solute in the solution.

109.

What is the substance formed after a chemical reaction?

a)

Product.

b)

Liquid.

c)

Reactant.

d)

Gas.

110.

At 25 °C and 1 bar, how much volume does 1.5 moles of gas occupy?

a)

31.587 l.

b)

35.187 l.

c)

38.175 l.

d)

37.185 l.

111.

What is the mass of 0.25 moles of NaCl?

a)

13.235g.

b)

14.625g.

c)

6.1975g.

d)

25g.

112.

Which of the following processes is a chemical change?

a)

Gasoline in an open container evaporates.

b)

Heating a stainless steel spoon.

c)

Dissolving quicklime (CaO) in water.

d)

Opening a carbonated drink bottle releases gas.

113.

What is the specific gravity of sulfur dioxide (SO2) compared to chlorine (Cl2)?

a)

0.9

b)

0.19

c)

1.5

d)

1.7

114.

In the salts NaCl, CaCO3, KNO3, BaSO4, CuSO4, AgCl, MgCO3, how many salts are soluble in water?

a)

3.

b)

4.

c)

5.

d)

6.

115.

What is the name of the salt of hydrochloric acid?

a)

Chloride salt.

b)

Phosphate salt.

c)

Carbonate salt.

d)

Sulfate salt.

116.

Which of the following is a salt?

a)

K2O.

b)

HCl.

c)

K2SO4.

d)

H2SO4.

117.

Which salt does not dissolve in water?

a)

KCl.

b)

NaCl.

c)

AgCl.

d)

CuCl2.

118.

Which statement is correct?

a)

All carbonate salts are soluble.

b)

All salts of metals K, Na are soluble.

c)

All salts of metals Cu, Ag are soluble.

d)

All sulfate salts are insoluble.

119.

What do chemical fertilizers contain?

a)

Essential nutrients for plants.

b)

Nitrogen and some other elements.

c)

Phosphorus and some other elements.

d)

Potassium and some other elements.

120.

Chemical fertilizers are divided into types:

(a)  

121.

What are the types of chemical fertilizers?

a)

macro, micro, trace

b)

macro, micro, medium

c)

macro, medium, trace

d)

medium, trace, micro

122.

Which nutrient element is not contained in macronutrients?

a)

N

b)

P

c)

S

d)

K

123.

What is the chemical formula of Urea?

a)

NH4NO3

b)

NH4Cl

c)

(NH2)2CO

d)

(NH4)2SO4

124.

What nutrient does nitrogen fertilizer provide to plants?

a)

P

b)

K

c)

N

d)

Ca

125.

Which statement about density is correct?

a)

The density of a substance is the mass of one unit volume of that substance.

b)

The density of iron is 7800kg/m3 meaning 1cm3 of iron has a mass of 7800kg.

c)

The formula for calculating density is D = m.V.

d)

Density equals specific weight.

126.

What is pressure?

a)

Force applied at an angle to the surface being pressed.

b)

Force applied parallel to the surface being pressed.

c)

Force applied perpendicular to the surface being pressed.

d)

Force applied coinciding with the surface being pressed.

127.

What is the unit of pressure?

a)

N

b)

N/m3

c)

kg/m3

d)

N/m2

128.

What is an ammeter used for?

a)

Measuring voltage

b)

Measuring current

c)

Measuring current direction

d)

Checking for electrical presence

129.

What does the effect of pressure depend on?

a)

Direction of force.

b)

Magnitude of force.

c)

Point of application of force.

d)

Magnitude of pressure and area of the surface being pressed.

130.

In which case is the pressure exerted by a person on the floor the highest?

a)

Wearing high heels and standing on both feet.

b)

Wearing high heels and standing on one foot.

c)

Wearing flat shoes and standing on both feet.

d)

Wearing flat shoes and standing on one foot.

131.

Why does a life jacket not sink in water?

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132.

Why does the life jacket not sink in water?

a)

Because the mass of the life jacket is less than the mass of water.

b)

Because the specific mass of the life jacket is less than the specific mass of water.

c)

Because the life jacket is light.

d)

Because the volume of the life jacket is greater than water.

133.

The buoyant force of Archimedes depends on

a)

the amount of liquid in the tank and the mass of the object.

b)

the volume of the liquid displaced by the object and the nature of the liquid.

c)

the depth of the submerged object compared to the bottom of the tank.

d)

the specific mass of the object.

134.

Under which of the following conditions will an object rotate?

a)

Using a knife to cut a birthday cake.

b)

Using your hand to open the faucet lever.

c)

Using your hand to swipe the phone screen.

d)

Using a hammer to drive a nail into the wall.

135.

The moment of a force with respect to an axis is a quantity characteristic of?

a)

The pulling effect of the force.

b)

The compressive effect of the force.

c)

The bending effect of the force.

d)

The rotating effect of the force.

136.

Which of the following is an application of the lever?

a)

Paper clip.

b)

Slide.

c)

Lifting a cart onto a platform with a plank.

d)

Wheel at the top of the flagpole.

137.

An object in a liquid will float when

a)

P ≥ FA

b)

P > FA

c)

P = FA

d)

P < FA

138.

Calculate the efficiency of the reaction?

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139.

Write the formula to determine the density of a substance? Explain the significance of each variable in the formula?

4 lines
140.

What is the meaning of each quantity in the formula?

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141.

A water tank has internal dimensions of 80 cm x 20 cm x 25 cm. What is the mass of water in the tank when it is full, given that the density of water is 1.0 g/cm3?

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142.

Explain why rubbing a glass rod with silk causes the glass rod to become positively charged while the silk becomes negatively charged?

4 lines
143.

What is the balanced equation for the reaction of 2KClO3?

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144.

What is the theoretical mass of O2 produced in the reaction?

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145.

What is the actual mass of O2 obtained in the reaction?

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146.

What is the efficiency of the reaction if the theoretical mass is 7.68g and the actual mass is 5.76g?

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147.

What is the density of the substance (kg/m3; g/cm3; g/mL)?

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148.

What is the mass of the substance (kg; g)?

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149.

What is the volume of the substance (m3; cm3; mL)?

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150.

What is the internal volume of the water tank?

(a)  

151.

What is the mass of water in the tank when it is full?

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152.

When rubbing a glass rod with silk, what happens to the electrons?

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