When you measure a volume of a liquid using a graduated cylinder, read the top p
ID: 1068663 • Letter: W
Question
When you measure a volume of a liquid using a graduated cylinder, read the top position of the meniscus of a liquid to determine the volume. Extra chemicals you sampled should be returned into the original container Report immediately any accident in the lab, even if it is minor, to the lab instructor. Wearing eye goggles is required for only when certain experiments performed in the chemistry laboratory. An organic dye phenolphthalein is used for detecting an end point of a d-base titration. The boiling, melting points and solution are physical property of a compound. The temperature 98.6 degree f is equal to 37 degree C and 320 K. It takes 18 0 ml of 0.40M NaOH solution to neutralize 20 0 mL of 3.6M HCl Solution. The color and odor are chemical properties of a compound. is a a redox reacts. All sulfides are insoluble except those of alkali and alkaline earth metals and NH_4. Hess slaw states that enthalpy of a reaction is equal to the sum of enthalpy change for individual step in sequence. The oxidation number of Mn in MnO_2 is +6. H_2S has odor of rotten eggs but it is nontoxic. Drinking and eating in the chemistry laboratory are at the discretion of each student. To obtain the accurate mass out should avoid weighing a hot object on a single. pan balance. The boiling point of a liquid will be higher than that of at 1 atm when the atmospheric pressure decreases. The definition of the density of a solid is volume/mass.Explanation / Answer
1. False if the solution is colourless, if it is colourled solution the upperminescus sholud be noted
2. FALSE
3. TRUE
4. FALSE ( AFTER ENTERING INTO THE CHEMISTRY LAB WE SHOULD WEAR ALL PPE (PERSONAL PROTECTIVE EQUIPMENT) LIKE APRON, GOGGLES AND HAND GLOUSES.
5.true, it is acid base indicator
6. TRUE
7. FALSE(37 + 273 = 310 KELVIN)
8.false , the concentration of HCl should be 0.36M
9. TRUE
10.TRUE , Mn is oxidized, chlorine is reduced
11.false, HF is weak acid
12.true
13. TRUE
14.false, 100 has only one significant figure
15.false, oxidation state is +4
16. FALSE
17. FALSE
18. TRUE
19.false, will experience lower boiling point at lower pressure
20. FALSE DENSITY = MASS / VOUME
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