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WorksheetsCÁC DẠNG BÀI TẬP HÓA 9
Total questions: 107
Worksheet time: 4hrs 31mins
Given the metals aluminum, iron, and gold reacting with oxygen. Identify the phenomena that occur corresponding to which metal.
Burns brightly in the air forming a white solid.
Does not react with oxygen.
Burns in the air producing brown-red smoke.
Heat the metals sodium, iron, and copper and successively put them into a container of chlorine gas. The products after the reaction dissolve in water to obtain solutions of the following colors:
Brown-yellow.
Blue.
Colorless.
Given the experimental diagram described in Figure 18.1. Clamp an object made of copper, plastic, wood, rubber, glass, steel, and ceramic with two clamps. Turn on the switch and observe the light bulb.
Predict the phenomenon that occurs with the object made of copper, plastic, wood, rubber, glass, steel, and ceramic in the above experiment.
What property of metals does this experiment demonstrate?
Given the experimental diagram described in Figure 18.2. Pour hot water (about 90 °C) into a bowl. Place metal, plastic, wood, and porcelain spoons into the bowl of water. After about 2-3 minutes, hold the handle of each spoon and observe the temperature change of the different types of spoons. Repeat the experiment with a bowl of cold water with some ice cubes.
Predict the phenomenon that occurs in the above experiment.
What property of metals does this experiment demonstrate?
What does this experiment prove about metals?
In the experiment: When a piece of sodium is added to a basin of water, it is observed that the sodium melts and then catches fire. Write the chemical equation for the reaction between sodium and water. Explain why the sodium melts. Explain why there is fire from the sodium piece. Write the chemical equation for the reaction.
A copper plate weighing 4 g is placed in 100 mL of 0.5 M silver nitrate solution. After about 15 minutes, the metal plate is taken out, gently washed, dried, and weighed 7.04 g (assuming all the silver produced adheres to the copper plate). Calculate the concentrations of the substances in the solution after the reaction.
A mixture of iron and copper. Please describe how to separate each metal in this mixture using chemical methods.
A mixture of aluminum and iron.
A mixture of aluminum and iron reacts with Cu(NO3)2 solution to produce solution A and solid B consisting of two metals. When solid B reacts with HCl solution, bubbles are observed. Which metal is not present in solid B?
Fe and Al
Cu
Al
Fe
A sample is contaminated with aluminum and iron. To determine the percentage of impurities in the sample, 5 g of the sample is dissolved in 100 mL of 2 M HCl solution. After the reaction is complete, the amount of undissolved solid is found to be 4.45 g, and the concentration of the remaining HCl solution is 1.6 M. Calculate the percentage of aluminum and iron in the sample.
To identify a metal, a student completely dissolves 0.9 g of the metal in 2.5 M HCl solution and uses 40 mL of the solution. Determine the metal (knowing the valence of the metal is between I and III).
Why does the surface of sodium lose its shiny appearance quickly?
To preserve sodium metal, it is necessary to immerse a piece of sodium in kerosene without exposing it to air. Please explain.
When handling sodium, it is only allowed to use tweezers and not to hold it directly with hands. Please explain.
A solution A contains CuSO4 and FeSO4. When an aluminum wire is immersed in solution A, the following cases are observed: a) After the reaction, the solution has 3 soluble salts. b) After the reaction, the solution has 2 soluble salts. c) After the reaction, the solution has 1 soluble salt. Please explain each case using the chemical reaction equations.
What are the physical properties of metals?
Ductility
Thermal conductivity
Electrical conductivity
Luster
Based on the different physical properties of metals, please state the applications of some metals in life and production?
Which metal is used as a material to produce utensils or construct buildings? Why?
Iron
Copper
Aluminum
Zinc
Predict the chemical properties of that metal and propose experiments to verify the prediction?
Write the chemical equations of the reactions that occur (if any) when the metals Zn, Al, Cu react with: Oxygen (O2); Chlorine (Cl2); Dilute H2SO4 solution; FeSO4 solution.
Which metal is used as the filament of light bulbs?
What metal is used for the filament of incandescent bulbs, and why is that metal chosen?
Copper
Tungsten
Aluminum
Iron
Why are incandescent bulbs less commonly used today compared to LED bulbs?
They are cheaper
They have a longer lifespan
They are more energy-efficient
They produce more heat
Fill in the blanks to complete the following chemical equations:
Describe the phenomena observed in experiment 15.1. What can be concluded about the reactivity of metals with acid solutions (HCl, diluted H2SO4), and arrange the reactivity in descending order.
What is the chemical equation for the reaction that produces H2 gas by displacing air?
Why must the test tube be inverted to collect H2 gas by displacing air?
What is the chemical equation for the reaction that occurs?
Why must we invert the test tube to collect H2 gas by pushing air?
Is there another way to collect H2 gas? If so, state and explain that method.
When a hammer strikes an aluminum wire, the wire flattens. This proves that aluminum has
A. ductility.
B. hardness.
C. toughness.
D. durability.
Copper is used to make lightning rods because it has
A. durability.
B. luster.
C. electrical conductivity.
D. ductility.
A friend observes a surface of an object shining under sunlight. Which of the following could be the surface of that object?
A. Plastic marble.
B. Aluminum foil.
C. Clay bar.
D. Paper.
Which metal reacts with water under normal conditions, releasing hydrogen gas?
A. Cu.
B. Au.
C. Fe.
D. K.
Which metal does not react with HCl solution?
A. Na.
B. Mg.
C. Ag.
D. Al.
Which metal reacts with steam at high temperatures to form metal oxide?
A. Zn.
B. Cu.
C. Ag.
D. Au.
When a piece of calcium is added to HCl solution, the observed phenomenon is
A. calcium does not react.
B. calcium does not dissolve but bubbles form.
C. calcium dissolves and bubbles form.
D. calcium dissolves, no bubbles form.
The metal with the lowest melting point is
A. gold.
B. aluminum.
C. tungsten.
D. mercury.
Previously, tungsten was used to make light bulb filaments due to its advantage of
A. high ductility.
B. being light and durable.
C. good electrical conductivity.
D. very high melting point.
Which of the following statements about the physical properties of metals is incorrect?
Which of the following statements about the physical properties of metals is incorrect?
Melting point: Hg < Al < W
Ductility: Al < Au < Ag
Hardness: Cs < Fe < W < Cr
Electrical conductivity and temperature: Fe < Al < Au < Cu < Ag
The general physical properties of metals are
ductility, luster, very hard.
ductility, electrical conductivity, high melting point.
thermal conductivity, luster.
thermal conductivity, electrical conductivity, high density, luster.
Which metal is ductile, silvery white, conducts heat well, and has wide applications in life?
Al
Fe
Ag
Cu
A metal can be drawn into wires, easily flattened or bent due to
electrical conductivity.
luster.
ductility.
thermal conductivity.
Which two metals are commonly used as electrical conductors?
Iron, gold
Aluminum, lead
Aluminum, silver
Aluminum, copper
Under normal conditions, which series of metals has decreasing electrical conductivity from left to right?
Ag, Cu, Fe, Al, Au
Ag, Cu, Au, Al, Fe
Au, Ag, Cu, Al, Fe
Al, Cu, Fe, Au, Ag
The shiny appearance of metals under normal conditions is called
electrical conductivity.
luster.
thermal conductivity.
ductility.
Tungsten (W) is used to make light bulb filaments because this metal has the characteristic physical property of
high hardness.
high melting point.
luster.
good electrical conductivity.
Which metal is liquid at normal conditions, silvery white, and is commonly used in thermometers and barometers?
Silver
Aluminum
Mercury
Copper
Aluminum is a metal used to make kitchen utensils (pots, pans, kettles, etc.). This application is due to aluminum being durable, non-toxic, and having superior physical properties of
good electrical conductivity.
soft, ductile.
luster.
What is the application of aluminum in making kitchen utensils?
Good conductor of electricity.
Soft and ductile.
Has a metallic luster.
Good conductor of heat.
Which metal has the highest hardness among the metals used to make stainless steel?
Chromium.
Aluminum.
Iron.
Copper.
At normal conditions, the density of water is 1.00 g/cm3. The densities of metals K, Na, Mg, Fe are 0.86 g/cm3; 0.97 g/cm3; 1.74 g/cm3; 7.90 g/cm3 respectively. How many of these metals will float on water?
1.
2.
3.
4.
Which pair of metals reacts with water at normal temperature?
Na, Al.
Al, Cu.
K, Na.
Mg, K.
In the following experiments: (1) Add Zn to H2SO4 solution. (2) Add Ag to H2SO4 solution. (3) Add Fe to CuSO4 solution. (4) Add Cu to FeSO4 solution. How many of these experiments will have a reaction?
1.
2.
3.
4.
Write the chemical equations for the reactions that occur in the experiments.
When left in the air for a long time, steel (mainly composed of iron) rusts while gold remains shiny. Which of the following statements is true or false?
Iron reacts with oxygen in the air, while gold does not react.
Iron is more chemically active than gold.
Gold is inert chemically.
Gold has a metallic luster, while steel does not.
Indicate whether the following statements are true or false by marking the table below:
Determine whether the following statements are true or false by marking the table as follows: a) Different metals have different electrical conductivity. b) Different metals will have different melting points. c) The thermal conductivity of metals increases in the order Ag, Cu, Al, Zn, Fe,... d) Metals with a specific gravity less than 5 g/cm3 are light metals, such as Na, K, Mg, Al,... e) Most metals react with dilute acid solutions HCl, H2SO4 and release hydrogen gas. g) Only when heated to high temperatures do metals react with oxygen.
In the metals sodium, zinc, copper, silver, magnesium, which metal has the following properties? a) Reacts violently with water under normal conditions, releasing heat and hydrogen gas. b) Reacts with HCl solution releasing hydrogen gas. c) Displaces iron from its salt in solution.
Sodium
Sodium, Zinc, Magnesium
Zinc, Magnesium
Fill in the appropriate words in the blanks below: Metal ...(1)... in the activity series can displace ...(2)... behind it from ...(3)... of metal ...(4)...
comes before
metal
salt
comes after
Given a piece of metal A, B, C in water at room temperature, the following phenomenon is observed: Metal A slowly reacts with water after a few seconds.
Given a metal A, B, C in water at normal temperature, observe the following phenomena: Metal A reacts slowly with water, small bubbles appear on its surface. Metal B reacts very quickly, the reaction heat causes it to burn brightly with small sparks, and gas produced ignites. Metal C reacts quickly, the reaction heat causes it to melt, and the gas produced ignites. Arrange metals A, B, C in order of decreasing chemical activity.
Knowing that A is a metal with valence II and B is a metal with valence I. Write the chemical equations for the reactions of A and B with water.
Potassium reacts with water at normal temperature. Meanwhile, zinc and iron do not react with water at normal temperature but react with steam at high temperature. Write the chemical equations for the reactions of these metals with water. Specify the reaction conditions (if any).
Compare the chemical activity of potassium with zinc and iron. From the given data, can the chemical activity of zinc and iron be compared?
Propose an experiment to compare the chemical activity of zinc and iron.
Based on the activity series, which metal is more chemically active, zinc or iron? Write a chemical equation to illustrate.
If experiment (1) shows a reaction, then Zn is more reactive than Fe. If experiment (2) shows a reaction, then Fe is more reactive than Zn. In reality, Zn is more reactive than Fe. Write the chemical equation for the reaction: Zn + FeSO4 -> ZnSO4 + Fe.
Given a piece of potassium in a CuSO4 solution, bubbles of gas are observed and a blue precipitate appears. Write the chemical equations to explain the observed phenomena.
Arrange the metals X, Y, Z, T in order of decreasing reactivity based on their reactions with distilled water and HCl solution.
T > Y > X > Z
Y > T > X > Z
X > Y > Z > T
Z > Y > T > X
Indicate the position of the metals relative to H in the reactivity series.
Propose a method to prepare Ag from AgNO3 solution.
To weld two pieces of metal, one can use the aluminum thermal welding method. In this method, a mixture of metal oxide powder and aluminum powder is ignited to cause a reaction (thermite reaction). This reaction releases a large amount of heat, producing molten metal and aluminum oxide (Al2O3). The molten metal will fill the welding gap.
Write the chemical equation for the thermite reaction in the case: - Iron(III) oxide powder reacts with aluminum powder. - Copper(II) oxide powder reacts with aluminum powder.
Choose the mixture in column (A) suitable for welding the two metal bars in column (B) in the table below: A: Mixture B: Two metal bars (1) Aluminum powder and Fe2O3 (x) Aluminum (2) Aluminum powder and CuO (y) Zinc (3) Aluminum powder and ZnO (z) Iron (t) Copper
(1) - (z)
(2) - (t)
(3) - (y)
Based on the activity series, explain why aluminum powder can be used to react with many metal oxides?
Explain why metals K, Na, Ca,... when reacting with salt solutions do not displace metals behind them from the salt solution?
Predict and explain the following cases: a) Can aluminum metal react with CuSO4 solution? Why? b) Can silver metal react with HCl solution? Why?
In nature, aluminum exists in what forms?
What is the main raw material for aluminum production?
Why is cryolite (3NaF-AlF3) added to aluminum oxide during aluminum production?
Write the chemical equation for the reaction that occurs when a mixture of two metals Cu and Zn is added to dilute H2SO4.
Calculate the mass of the solid remaining in the solution after the reaction.
Write 2 chemical equations illustrating the following cases: a) A metal reacts with oxygen to form a basic oxide. b) A metal reacts with a non-metal to form a salt. c) A metal reacts with an acid solution to form a salt and release hydrogen gas. d) A metal reacts with a salt solution to form a new salt.
According to the plan, a company producing aluminum intends to use 2 tons of bauxite ore (the content of AI2O3 in the ore is 48.5%) to produce aluminum. With the efficiency of the entire process being 90%, what is the mass of aluminum produced by the company?
Figure 16.1 shows the trend of chemical activity levels of some metals. a) What is the direction of the arrow indicating the trend of increasing or decreasing chemical activity of metals?
Increase
Decrease
b) Which metal needs to be stored in kerosene?
Sodium
Calcium
Copper
Silver
c) In the air, which metal is least likely to change into another substance?
Sodium
Calcium
Copper
Silver
d) Which metal can react with water at room temperature?
Sodium
Calcium
Copper
Silver
e) Which substance can react with many metals in Figure 16.1 to produce gas?
Acid
Water
Oxygen
Chlorine
Which substance can react with many metals to produce gas?
Sodium, Calcium
Copper, Silver
Sodium, Calcium, Magnesium
Acid, Water
Among the metals Pb, Zn, Al, Fe, Ag, and K, which metal reacts with water to produce a base solution?
Among the metals Pb, Zn, Al, Fe, Ag, and K, which metal reacts with dilute sulfuric acid to produce hydrogen gas?
Among the metals Pb, Zn, Al, Fe, Ag, and K, which metal reacts with copper(II) sulfate solution to produce metal?
Among the metals Pb, Zn, Al, Fe, Ag, and K, which metal reacts with copper(II) sulfate solution to produce hydrogen gas?
To compare the reactivity of Li, Na, K, small pieces of each metal are placed in separate cups of water with a few drops of phenolphthalein. What observations can be made?
Write the chemical equations for the reactions that occur when Li, Na, and K react with water.
How can it be confirmed that the bubbles produced are hydrogen gas?
From the observations in the table, arrange the metals Li, Na, K in order of decreasing reactivity.
Magnesium, calcium, strontium (Sr) are three elements in group IIA of the periodic table. What observations can be made when equivalent pieces of magnesium, calcium, and strontium are placed in water at room temperature?
Predict the phenomenon and provide appropriate information to fill in the ? in table 16.2.
Write the chemical equation for the reactions that occur.
Predict the observed phenomenon and write the chemical equation for the reactions that occur when a small piece of Na is added to a beaker containing excess copper(II) sulfate solution.
Can K be used to displace Cu from the salt solution? Explain.
When heated, many carbonate salts decompose into basic oxide and carbon dioxide. What is the decomposition temperature?
