Name: 7. You have got the mass of a sample. When there is not enough water in th

Question

Name: 7. You have got the mass of a sample. When there is not enough water in the cylino sample, the density of the substance would be A. impossible to be calculated, because the volume of the sample cannot be de too high, because the calculated volume of the sample will be too sima C.too low, because the calculated volume of the sample will be too small ll still correct using the current volume minus the volume of water 8. Adding 6M HCI into 20ml 3M NaO solution. How much HC1 need to be added to reach pll 7.0? A. 20 ml B. 10 ml C. 30 ml D. 5 ml 9. CHC00H is a weak acid and HCl is a strong acid. You will need NaOH to neutralize CH COOH than the amount to neutralize HC1. A. less amount of B. the same amount of C. more amount of If one forgot to exclude the unburned part of Magnesium ribbon and put both the burned product and unburned part into the test tube, then added diluted hydrochloric acid (HCI), he or she: A. Will see the same phenomena with that when adding HCl onto the original Mg ribbon, 10. because the unburned part contains Mg. B. Will not see the phenomena happened that when adding HCI onto the original Mg ribbon. C. Will see only solution forms, because after burning, Mg becomes Magnesium oxide (MgO) . and MgO + 2HCI MgCl2 + H2O D. Will see completely different phenomena with that when adding HCl onto the original Mg ribbon.

Explanation / Answer

Density is the mass of substance present in unit volume, or density = mass / volume

here volume is the volume of cylinder. If there is not enough water to cover the sample means, volume of water is low. So density more depends on mass. So Density will be high, So option-b is the answer. Density and volume are inversely proportional.

8. Use molarity equation M1 V1 = M2 V2

M1 = 6 M

V1 ?

M2 = 3 M

V2 = 20 ml

therefore, V1 = (M2 V2)/ M1 = (3 x 20 ) / 6 = 10 mL

9.

HCl and NaOH are strong acid and base respectively. So less amount of NaOH needed to neutralize CH3COOH than the amount required to neutralize HCl.

10.

will see solution form. Dilute hydrochloric acid itself a solution, and Mg + 2HCl ? MgCl2 + H2O and the burned product is MgO which on reaction with HCl gives a solution of MgCl2 and H2O.

So option-c is the answer.

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