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3 years ago

Interactivity: Hot on the Inside

Chemistry

1 answer:

inessss [21]3 years ago

8 0

According to oxfords dictionary, another definition for this is the ability of a computer to respond to a users input.

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During an experiment, a strip of magnesium (Mg) was measured for its length. The scientists completed four trials of measurement

umka21 [38]

The only option that fits is the last one — improper and biased measurements.

A scientist should be able to estimate a measurement to a tenth of the smallest scale division. The millimetre ruler would give an uncertainty of ±0.1 mm. The inch ruler would give an uncertainty of ±0.1 in. Since 1 in = 25.4 mm, 0.1 in = 2.54 mm. Thus, the <em>millimetre ruler is more precise</em> than the inch ruler.

Converting units <em>does not</em> change the degree of precision of a measurement.

The first scientist <em>did not</em> convert the units (the second scientist did!).

BUT, having different team members make the observations could introduce uncertainties caused by improper or biased readings of the equipment.

4 0

3 years ago

Which ion will most likely form a precipitate when reacted with SO42 ?

Charra [1.4K]

<h2>Answer:Ba $^2+$ </h2>

Explanation:

option A:

$SO_{4}^{2-}$ is an anion and $Cl^{1-}$ is also an anion.So,there is no reaction.

option B:

$K^{+}$ reacts with $SO_{4}^{2-}$ to form $K_{2}SO_{4}$ .

Since $K$ is a first group element,all its salts are soluble in water.

Hence no precipitate is formed.

option C:

$Na^{+}$ reacts with $SO_{4}^{2-}$ to form $Na_{2}SO_{4}$ .

Since $Na$ is a first group element,all its salts are soluble in water.

Hence no precipitate is formed.

option D:

$Ba^{2+}$ reacts with $SO_{4}^{2-}$ to form $BaSO_{4}$ .

Solubility of sulphates of second group elements decrease down the group.

So, $BaSO_{4}$ is a precipitate.

6 0

3 years ago

What is caused by the chemical weathering that leads to the breakdown of rocks?. . . . A. ice wedging. . . . B.thermal expansion

JulsSmile [24]

I believe the correct answer among the choices listed above is option D. Rusting is caused by the chemical weathering that leads to the breakdown of rocks. This chemical weathering is caused by oxidation or the reaction with oxygen.

5 0

3 years ago

Read 2 more answers

If 20 atoms of aluminum react with 45 molecules of chlorine gas, which reactant is limiting and how many more atoms/molecules wo

saul85 [17]

Al:ch2 an molar ratio.

2:3 and an x. X is 30. 20/2 = 10 so an answer is

45/3 = 15. Both ratios are used

45 - 30 = 15 CL2 left.

Your Welcome :)

4 0

3 years ago

Read 2 more answers

Jimmy's Chemical reaction/ Recipe for making Grilled chese sandwiches is given below: 1 slice of cheese + 2 slices of bread = 1

Juli2301 [7.4K]

Answer:

See explanation

Explanation:

We have been told in the question that the equation of the reaction is; 1 slice of cheese + 2 slices of bread = 1 Grilled cheese sandwich ( mole ratio is, 1:2:1) .

Then the reagents are 10 slices of cheese 30 slices of bread. It then follows that 10 slices of cheese should be combined with 20 slices of bread according to the mole ratio.

However, we have 30 slices of bread and 10 slices of cheese so cheese is the limiting reactant while bread is the reactant in excess.

Yes, the number of glilled chese sandwishes he can make is decided by the limiting reactant because it gets used up most.

4 0

3 years ago