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posledela
3 years ago
9

Which procedure must be completed before switching to high power objective on a microscope

Chemistry
1 answer:
Elis [28]3 years ago
7 0
1.turn  the  revolving  turret  so  that low  power  lens  come  into  position
2 place  the  microscope  slide  on  the  stage
3 look  at  the  objective  lens  and the  stage  from  the   side  as  you  turn   adjust  knob  so  that  stage   can  move  upward
4 look  through  the  eyepiece  and  move  the    focus  knob  until  image  come  into  focus
5.adjust  the   condenser   to regulate  thee  amount of  light
6 move  the  microscope  slide  around  until  the  sample  is  in  the   center of  field  of  view







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1. Why is a homogeneous mixture not considered a pure substance?

<u><em>Answer:</em></u>

  • A pure substance can be separated by chemical means, while a mixture can be separated by physical means.

2. What is true if mass is conserved in a reaction?

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3. <em>Methane reacts with oxygen then what are the products?</em>

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5. The substance is not uniform in appearance and each part of the mixture contains a combination of different ingredients in different ratios.

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6. If a solution is saturated, which of these is true?

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  • More solvent can be dissolved

7. Which of these substances are molecules?

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8. What makes a solution a homogeneous mixture?

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9. When a solute is added to a solution, why does it remain homogeneous?

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10. The chemical formula of glucose is C6H12O6, so it is classified as a(n)

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  • pure substance.

11. <em>How many chlorine (Cl) atoms would be in 4 molecules of salt (4 NaCl)?</em>

<u><em>Answer:</em></u>

  • 4

12. <em>In a solution of salt and water, which component is the solute?</em>

<u><em>Answer:</em></u>

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13. These substances are all   H2O2,   Li , NaCl , O2

<u><em>Answer:</em></u>

  • Pure Substances

14. If you have 5 grams of product after a chemical reaction, how many grams of reactants did you have at the start of the reaction?

<em>Answer:</em>

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<u><em>Answer:</em></u>

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17. If Lavoisier heated 100 grams of powdered mercuric oxide to produce 93 grams of liquid mercury, how much oxygen would be released?

Solution

                       2HgO ==> 2Hg + O2

Mass of HgO = 100 g

Molar mass of HgO = 216.59 g/mol

Moles = mass/molar mass = 0.46 moles

From balance chemcial equation

   HgO :  O2

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18. Using the Law of Conservation of Matter, determine the number of grams of iron sulfide (FeS) that will be produced in this reaction.

<em><u>Solution</u></em>

                         12g Fe + 64g S → _____ g FeS

  • According to Law of Conservation of Matter, The total mass of reactant is equal to total mass of  product , so the number of grams of iron sulfide (FeS) that will be produced in this reaction as follow.

                              12 + 64 = 76 g of FeS


Hope this Help.

 





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