1 Which organic compound is used as a solvent? A Ethanol B Sodium chloride C Calcium carbonate D Sulfuric acid
2 Tina is studying the combustion of alkanes. She knows that alkanes are used as fuels in vehicles. Which of the following is a major component of natural gas? A Propane B Butane C Methane D Octane
5 George is conducting an experiment and notices that his results vary widely. He calculates the range of his data. What is the range? A The difference between the largest and smallest values B The average of the data C The most common value D The middle value of the data
6 Khalid is learning about isomerism. He understands that isomers are compounds with the same molecular formula but different structures. Which of the following is an example of isomers? A Methane and ethane B Butane and isobutane C Ethene and ethyne D Propane and butane
7 Nucleic acids are responsible for: A Energy production B Fat storage C Genetic information D Protein digestion
8 Ahmed is learning about organic compounds in his chemistry class. He understands that organic compounds contain carbon. Which of the following is an organic compound? A Carbon dioxide B Methane C Sodium chloride D Water
9 Qasim is studying carbohydrates. He learns that carbohydrates are classified as simple or complex. Which of the following is a simple carbohydrate? A Cellulose B Fructose C Starch D Glycogen
10 Uma is studying the properties of alkanes. She knows that alkanes are non-polar and have low boiling points. Which alkane is a gas at room temperature? A Hexane B Octane C Methane D Decane
11 Laura is studying lipids. She learns that lipids are a diverse group of hydrophobic molecules. Which of the following is a function of lipids in the body? A To store energy and form cell membranes B To catalyze reactions C To store genetic information D To provide quick energy
12 Chloe is studying the halogenation of alkanes. She knows that bromine reacts with alkanes in the presence of UV light. What type of mechanism is involved in halogenation? A Free radical substitution B Nucleophilic substitution C Electrophilic addition D Elimination
13 The horizontal axis of a graph usually represents: A Dependent variable B Independent variable C Result D Conclusion
14 Ibrahim is preparing a graph to represent the relationship between temperature and solubility. Which type of graph is most appropriate for showing this relationship? A Bar graph B Pie chart C Line graph D Histogram
15 Emma is learning about incomplete combustion. She knows that when there is insufficient oxygen, carbon monoxide or carbon is produced. What is the effect of carbon monoxide on humans? A It causes headache and dizziness B It is a nutrient C It is safe to breathe D It improves health
16 Quinn is studying the reduction of alkyl halides. He knows that alkyl halides can be reduced to alkanes. What is the reducing agent for converting iodomethane (CH3I) to methane? A Zn/HCl B H2/Ni C NaBH4 D LiAlH4
17 Ahmed is conducting an experiment to determine the boiling point of water. He records the temperature every minute. What type of data is Ahmed collecting? A Qualitative data B Quantitative data C Descriptive data D Observational data
18 Xia is studying aldehydes and ketones. She learns that aldehydes contain a carbonyl group at the end of a carbon chain. Which of the following is an aldehyde? A Acetone B Acetaldehyde C Ethanol D Acetic acid
19 Lara is recording the color change of an indicator in an acid-base titration. She notes the color at the endpoint. What type of data is this? A Qualitative data B Quantitative data C Continuous data D Discrete data
20 Which hydrocarbon turns bromine water colorless? A Alkane B Alkene C Cycloalkane D Saturated hydrocarbon
22 Alkenes are hydrocarbons having: A Only single bonds B At least one double bond C At least one triple bond D No bonds
23 Rania is studying alkynes. She understands that alkynes contain a carbon-carbon triple bond. What is the functional group of alkynes? A C=C B C≡C C C-C D C=O
24 Julia is studying the properties of alkanes. She knows that alkanes are less dense than water. Which of the following alkanes is used as a solvent? A Methane B Hexane C Propane D Butane
27 Emma is learning about carbohydrates. She understands that carbohydrates are a source of energy. What is the main role of carbohydrates in the body? A To build muscles B To provide energy C To store genetic information D To catalyze reactions
28 Which improves accuracy of an experiment? A Faulty instruments B Careful measurement C Guessing values D Ignoring errors
29 Addition reaction occurs due to presence of: A Single bond B Double or triple bond C Ionic bond D Hydrogen bond