The following steps are scientific methods except
- A. experimentation
- B. problem identification
- C. Analysis
- D. Open-mindedness
Which of the following reactions represents the hydrolysis of an alkanoate?
- A. \(CH_3COOH + OH^- ⇌H^+⇌ CH_3COO^- + H_2O\)
- B. \(CH_3COOH + C_2H_5OH ⇌H^+⇌ CH_3COOC_2H_5 + H_2O\)
- C. \(CH_3COOC_2H_5 + H_2O ⇌H^+⇌ CH_3COO^- + CH_3CH_2OH\)
- D. \(CH_3COOCH_2CH_3 + H_2O ⇌H^+⇌ CH_3COOH + CH_3CH_2OH\)
The following statements are correct except
- A. energy is released when liquids change to solids.
- B. carbon atoms in gaseous methane are further apart than those in solid diamond.
- C. there is large decrease in the volume of a solid metal when pressure is applied to it.
- D. particles move faster in the gaseous state than in the liquid state.
The vapour density of an organic compound with the molecular formula \(C_2H_4O_2\), is
[H=1.0, C=12.0, O= 16.0]
- A. 40
- B. 120
- C. 65
- D. 30
Which of the following is a common laboratory indicator for bases?
- A. Methyl orange
- B. Phenolphthalein
- C. Bromothymol blue
- D. Litmus
What is the maximum number of electrons that can occupy the second energy level (n=2)?
- A. 2 electrons
- B. 18 electrons
- C. 8 electrons
- D. 32 electrons
Which of the following statements is true for strong electrolytes?
- A. They do not conduct electricity in the molten state
- B. They completely dissociate into ions in solution
- C. They are non-polar substances
- D. They partially dissociate into ions in solution
An element has an atomic number of 8 and a mass number of 16. How many neutrons does this element have?
- A. 24
- B. 16
- C. 8
- D. 32
Which of the following statements is true regarding the melting and boiling points of pure substances?
- A. The boiling point is always higher than the melting point
- B. The melting point is always higher than the boiling point
- C. The melting and boiling points are always the same for all substances
- D. The melting and boiling points can vary depending on the substance
What is the IUPAC name for the compound CCl\(_4\)?
- A. Tetrahydrochloride
- B. Tetrachloromethane
- C. Carbon tetrachloride
- D. Chloroform
The lanthanides and actinides are located in which block of the periodic table?
- A. P-block
- B. S-block
- C. F-block
- D. D-block
Which of the following is a characteristic property of acids?
- A. Turn litmus paper blue
- B. Bitter taste
- C. pH value above 7
- D. React with metals to produce hydrogen gas
Which of the following is an example of a primary cell?
- A. Alkaline battery
- B. Nickel-cadmium battery
- C. Lead-acid battery
- D. Lithium-ion battery
The process of rusting is an example of the formation of
- A. Basic oxide
- B. Acidic oxide
- C. Reducing oxide
- D. Amphoteric oxide
Chlorine gas is commonly used in the production of which of the following industrial compounds?
- A. Chlorofluorocarbons (CFCs)
- B. Methane
- C. Ammonia
- D. Ethanol
What unit of temperature should be used when applying the ideal gas law?
- A. Fahrenheit (°F)
- B. Kelvin (K)
- C. Rankine (°R)
- D. Celsius (°C)
Which halogen is a gas at room temperature and is pale yellow in color?
- A. Chlorine (Cl)
- B. Fluorine (F)
- C. Iodine (I)
- D. Bromine (Br)
The heat of reaction can be determined experimentally using a device called a
- A. Calorimeter
- B. Barometer
- C. Spectrometer
- D. Thermometer
What is the mass (in grams) of 500 mL of ethanol? (density of ethanol = 0.789 g/mL)
- A. 394.5 mL
- B. 500 mL
- C. 394.5 g
- D. 500 g
Which of the following substances is NOT hygroscopic?
- A. Salt
- B. Sugar
- C. Silica gel
- D. Aluminum
Which of the following mixtures is an example of a colloid?
- A. Milk
- B. Orange juice
- C. Saltwater
- D. Sugar dissolved in water