1. The mole is a unit used to measure:
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2. Nora is making a saltwater solution. She adds 10 grams of salt to 100 grams of water and stirs. In this solution, what is the salt considered?
3. Nora is learning about the effect of temperature on gas solubility. She opens a cold soda can and it is more fizzy than a warm one. What is the relationship between gas solubility and temperature?
4. Fatima is studying endothermic reactions. She knows that photosynthesis is an endothermic process. What happens to the enthalpy (ΔH) in an endothermic reaction?
5. Vera is studying symbols for atoms and ions. She sees the symbol Cl-. What does the '-' sign indicate?
6. Yara is learning about the definition of chemistry. She reads that chemistry is also called the 'central science' because it connects physics with other natural sciences. Which of the following best supports this statement?
7. Chemical property is observed when a substance:
8. Usman is learning about oxidation and reduction in terms of electron transfer. He knows that in a redox reaction, one substance is oxidized and another is reduced. In the reaction: 2Na + Cl2 → 2NaCl, which substance is oxidized?
9. Which quantity links mass and number of particles?
10. The substance that dissolves the solute is called:
11. Rania is studying the structure of diamond. She learns that diamond has a rigid three-dimensional structure. What type of bonding is present in diamond?
12. Atomic number is equal to the number of:
13. Which component maintains electrical neutrality in a voltaic cell?
14. A supersaturated solution is:
15. Emma is studying exothermic reactions. She knows that burning methane is an exothermic reaction. Which of the following is a characteristic of exothermic reactions?
16. Ethan is studying the chemistry of plastic bags. He learns that plastic bags are made from polymers like polyethylene. Which branch of chemistry is most closely related to the production of plastics?
17. Which of the following is an intensive property?
18. Fatima has a beaker of water and a beaker of honey. She notices that honey pours much slower than water. She is comparing the fluidity of the two liquids. Which liquid has higher viscosity?
19. Ming is preparing a concentrated solution of sodium chloride. He adds more solute to the solvent. How does the concentration of the solution change?
20. Bilal is doing an experiment with a substance that takes the shape of its container but has a definite volume. He pours it from a beaker into a graduated cylinder, and it flows easily. What state of matter is Bilal working with?
21. Which of the following is a mixture?
22. Which bond is formed due to electrostatic attraction?
23. Chloe is mixing oil and water. After shaking, she notices that tiny droplets of oil are dispersed throughout the water but they do not settle out easily. This mixture is best classified as:
24. Inorganic chemistry mainly studies:
25. George is reading about biochemistry. He learns that it studies the chemical processes within living organisms. Which of the following is a key molecule studied in biochemistry?
26. Fatima is learning about the formula of ionic compounds. She knows that the charges of the ions must balance. What is the formula of the ionic compound formed between aluminum (Al3+) and oxygen (O2-)?
27. The modern atomic model explains:
28. Qasim is learning about electroplating. He understands that electroplating is a process that uses an electric current to coat a metal with another metal. Which of the following is a common application of electroplating?
29. One mole of any substance contains:
30. Lara is looking at a diamond ring and a pencil lead. She knows both contain carbon but have very different properties. The pencil lead contains which allotrope of carbon?