Moles and Concentration Practice Questions PDF
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This document contains a set of practice questions focused on the concepts of moles and concentration in chemistry. These questions cover topics such as calculating concentrations, the relationship between moles, concentration, and volume, and unit conversions. It's a helpful resource for students studying chemistry at the high school level, and contains multiple choice questions and answers.
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1. What is the symbol for concentration? * (A) n * (B) c * (C) V * (D) M 2. What are the standard units for concentration? * (A) mol.dm-3 * (B) g.dm-3 * (C) mol.cm-3 * (D) g.cm-3 3. What equation links moles (n), concentration (c), and volume (V)? * (A) n = cV * (B) c = nV * (C) V = nc * (D) n = V...
1. What is the symbol for concentration? * (A) n * (B) c * (C) V * (D) M 2. What are the standard units for concentration? * (A) mol.dm-3 * (B) g.dm-3 * (C) mol.cm-3 * (D) g.cm-3 3. What equation links moles (n), concentration (c), and volume (V)? * (A) n = cV * (B) c = nV * (C) V = nc * (D) n = V/c 4. What is the volume (V) in the equation n = cV *always* measured in? * (A) cm3 *(B) dm3 *(C) m3 *(D) litres 5. How many moles of solute are present in 2 dm3 of a 0.5 mol.dm-3 solution? * (A) 0.25 mol * (B) 1 mol * (C) 2 mol * (D) 4 mol 6. What is the concentration of a solution containing 0.1 moles of solute in 500 cm3 of solution? * (A) 0.05 mol.dm-3 * (B) 0.2 mol.dm-3 * (C) 0.5 mol.dm-3 * (D) 5 mol.dm-3 7. What volume of a 2 mol.dm-3 solution is needed to contain 0.4 moles of solute? * (A) 0.2 dm3 * (B) 0.8 dm3 * (C) 5 dm3 * (D) 8 dm3 8. Square brackets, [ ], around a chemical formula denote what? * (A) Moles * (B) Mass * (C) Concentration * (D) Volume 9. A solution with a low amount of substance per unit volume is described as: * (A) Concentrated * (B) Dilute * (C) Saturated * (D) Aqueous 10. A 1.0 mol.dm-3 solution of MgCl2 has what concentration of Cl- ions? * (A) 0.5 mol.dm-3 * (B) 1.0 mol.dm-3 * (C) 2.0 mol.dm-3 * (D) 3.0 mol.dm-3 11. What equation links n, c and V if the volume is given in cm3. * (A) n = cV/1000 * (B) n = cV * (C) n = 1000cV * (D) n = 1000c/V 12. Convert 25cm^3 into dm^3 * (A) 0.025dm^3 * (B) 0.25dm^3 * (C) 2.5dm^3 * (D) 25,000dm^3 13. To convert from g.dm-3 to mol.dm-3, you should: * (A) Multiply by the molar mass * (B) Divide by the molar mass * (C) Multiply by 1000 * (D) Divide by 1000 14. To convert from mol.dm-3 to g.dm-3, you should... * (A) Multiply by the molar mass * (B) Divide by the molar mass * (C) Multiply by 1000 * (D) Divide by 1000 15. How many moles are in 25cm3 of 0.100 mol.dm-3 NaOH? * (A) 0.0025 mol * (B) 0.025 mol * (C) 0.25 mol *(D) 2.5 mol 16. Rearrange n = cV to nd V. * (A) V = n/c * (B) V = c/n * (C) V = nc * (D) c = n/V 17. Rearrange n = cV to nd c. *(A) V = n/c * (B) V = c/n * (C) V = nc *(D) c = n/V 18. A solution of barium chloride contains Ba2+ ions at a concentration of 0.50 moldm-3. What is the concentration of Cl- ions? * (A) 0.25 moldm-3 * (B) 0.5 moldm-3 * (C) 1.0 moldm-3 * (D) 1.5 moldm-3 19. Concentration is... * (A) The number of moles present in 1 cm3 of solution * (B) The number of moles present in 1 dm3 of solution * (C)The number of moles in present in 100cm3 of solution *(D) The total number of moles in a solution fi fi 20. What is the concentration of 4g of NaOH in 250cm3 of solution? (Ar: Na = 23, O = 16, H = 1) * (A) 0.4 moldm-3 * (B) 0.1 moldm-3 * (C) 1.6 moldm-3 *(D) 0.2 moldm-3
