1. The chemical formula of water is:
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Half Book 2
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2. Which hydrocarbon contains a double bond?
3. Ethan is studying the effects of acid rain. He learns that acid rain can damage aquatic ecosystems. How does acid rain affect aquatic life?
4. Which parameter indicates the clarity of water?
5. Yara is studying carbon monoxide detectors. She learns that these detectors are important for safety. Why is a carbon monoxide detector important in homes?
6. A solution with pH less than 7 is:
7. Nora is studying the Bronsted-Lowry concept. She knows that an acid is a proton donor. In the reaction: H2SO4 + H2O → H3O+ + HSO4-, which species is the acid?
8. Chloe is learning about a balanced diet. She knows that a balanced diet provides all the necessary nutrients. What does a balanced diet include?
9. Nora is studying water pollution. She knows that household wastes can pollute water. Which of the following is a household waste that can pollute water?
10. Which compound is an alkene?
11. Khalid is studying the properties of bases. He knows that bases turn red litmus paper blue. What color does sodium hydroxide solution turn red litmus paper?
12. Which salt is formed by strong acid and strong base?
13. Which acid is present in vinegar?
14. The reaction of ethene with hydrogen is called:
15. Usman is learning about Le Chatelier's principle. He knows that increasing the pressure of a gaseous reaction will shift the equilibrium towards fewer gas molecules. In the reaction: N2 + 3H2 ⇌ 2NH3, what is the effect of increasing pressure?
16. Bongani is learning about indoor pollution. He understands that indoor air can be more polluted than outdoor air. Which of the following is a source of indoor air pollution?
17. Ming is analyzing data from a titration experiment. He calculates the mean volume of titrant used. What is the next step in his analysis?
18. Samir is learning about the functions of nucleic acids. He knows that nucleic acids store and transmit genetic information. Which part of the cell contains DNA?
19. Ibrahim is studying personal protective measures against pollution. He learns that masks can protect against pollutants. What is the main purpose of wearing an N95 mask during high pollution days?
20. Which instrument is used to measure mass?
21. Ibrahim is learning about alkynes. He understands that alkynes contain triple bonds. Which of the following is an alkyne?
22. Khalid is learning about the preparation of alkanes by the reduction of alkyl halides. He uses 2-bromobutane (C4H9Br) and reduces it. What alkane is formed?
23. George is studying the role of lipids in the body. He learns that lipids help in the absorption of fat-soluble vitamins. Which vitamins are fat-soluble?
24. Equilibrium constant is a measure of:
25. Which source provides natural organic compounds?
26. Yusuf is studying the halogenation of alkanes. He knows that iodine does not react readily with alkanes. Why is iodine less reactive in halogenation?
27. Ibrahim is studying ways to deal with the negative effects of water pollution. He knows that education is important. How can education help in dealing with water pollution?
28. Equilibrium can be disturbed by changing:
29. Which gas is used in welding?
30. Rania is studying photosynthesis. She understands that photosynthesis is a natural carbon sink. Which organisms are primarily responsible for photosynthesis?