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vova2212 [387]
3 years ago
8

Read the speedometer and report the speed to the proper

Chemistry
1 answer:
Dmitry [639]3 years ago
3 0

Answer:

  • In miles per hour: 82 mph
  • In km/h: 121 km/h

Explanation:

The correct number of digits to report a measure include every certain digit plus one uncertain digit.

The speedometer has marks for:

  • every 2 km per hour, km/h. Because each small tick mark on the outer circle represents 2 mph.

  • every 10 miles per hour mph. Because each small tick mark on the inner scale represents 10 mph.

As a rule you can appreciate up to half way between two small tick marks.

So, for km/h you can appreciate half of 2 km/h, i.e. 1 km/h.

The needle is marking between 120 km/h and 122 km/h, which means that the correct measure is 121 km, where the two leftmost digits are certain and the ones digit is uncertain.

For mph, you can appreciate half of 10 mph, i.e. 5 mph. A measure between 80 and 90 mph should be read as 85 mph.

Furthermore, in this last case of mph, the space between two consecutive marks is broad and equal to 10 mph but also the needle is wide, so it is difficult to appreciate less than 5 mph.

The correct measure must have two significant digits: one certain and one uncertain. So, 82 mph is as correct as 85 mph, since the 8 is certain and the next number (either 2 or 5) is uncertain.

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Hello,
nikitadnepr [17]

Answer:

a)\ 2FeSO4 \xrightarrow{\text{Heat}} SO_3+SO_2+Fe_2O_3\\b)\ Decomposition\ Reaction

Explanation:

<em>Ferrous Sulphate</em>(FeSO4)<em> is generally found as Lime-Green Crystals. On heating, these crystals almost immediately turn white-yellow. They then, break down to produce an anhydrous mixture of Sulphur Trioxide </em>(SO_3)<em>, Sulphur Dioxide </em>(SO_2)<em>  as well as Ferric Oxide </em>(Fe_2O_3)<em>.</em>

<em>We can hence, frame a skeletal equation of this reaction and try to balance it.</em>

<em>Hence,</em>

FeSO4 \xrightarrow{\text{Heat}} SO_3+SO_2+Fe_2O_3

<em>Now,</em>

<em>a)In order to balance it through the 'Hit &Trial Method', we'll follow a series of </em><em>steps</em><em>:</em>

<em>1. First, lets compare the number of  Fe (Iron) atoms on the RHS and LHS. We find that, the no. of Fe Atoms on the RHS is twice the number of Fe Atoms on the LHS. We hence, add a co-effecient 2 beside </em>FeSO_4.

<em>2. Now, Iron atoms, Sulphur Atoms and Oxygen atoms occur 2, 2, 8 respectively on both the sides:</em>

<em> Hence, As all the other elements as well as iron, balance, we've arrived upon our Balanced Equation :</em>

<em> </em>2FeSO4 \xrightarrow{\text{Heat}} SO_3+SO_2+Fe_2O_3

<em>b) We know that, decomposition reactions are [generally] endothermic reactions in which Large Compounds </em><em>decompose </em><em>into smaller elements and compounds. Here, as Ferrous Sulphate </em><em>decomposes </em><em>into Sulphur Dioxide, Sulphur Trioxide and Ferric Oxide, the reaction that occurs here is </em><em>Decomposition Reaction.</em>

7 0
3 years ago
The total volume of a soda can is 415 mL. Of this 415 mL, there is 60.0 mL of headspace(empty space aka volume) for the CO2 gas
almond37 [142]

Answer:

gay

Explanation:

6 0
2 years ago
8. Bring the balloon in contact with the wall. What happens to the charges in the wall?
Ne4ueva [31]

When the charged balloon is brought near the wall, it repels some of the negatively charged electrons in that part of the wall. Therefore, that part of the wall is left repelled.

<u>Explanation</u>:  

  • Balloons don't stick to walls. However, if you rub the balloon on an appropriate piece of material such as clothing or a wall, electrons are pulled from the other material to the balloon.
  • The balloon now as more electrons than normal and therefore has an overall negative charge. Two balloons like this will repel each other.
  • The other material now has an overall positive charge. Because opposite charges attract, the balloon will now appear to stick to the other material. If you didn't rub the balloon first, it's charge would be neutral and it wouldn't stick to the wall.
7 0
3 years ago
Why does a metal spoon left on a bowl of hot soup become warm?
irakobra [83]

Answer:

A) Metal is a conductor.

7 0
3 years ago
How is weight affected by gravity
Ira Lisetskai [31]
The higher levels of gravity put on an object the more weight the object has. For example someone who weighs say 100 lbs would weigh more if higher amounts of gravity would be applied to them. And less if less gravity was applied. But larger objects will automatically have more gravity applied to them than something smaller due to the gravitational pull needing to pull harder to keep the object to the planet's surface. Hope this helps! :)
7 0
3 years ago
Read 2 more answers
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