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2 years ago

Describe the trend (pattern) in the numbers of mobile phone owners in the Uk since 1990.

Chemistry

1 answer:

Inessa05 [86]2 years ago

4 0

Explanation:

<em><u>SMARTPHONE OWNERSHIP IS GROWING RAPIDLY AROUND THE WORLD, BUT NOT ALWAYS THE SAME.</u></em>

In emerging economies, the use of technology is still more common among the young and the educated

A farmer takes a selfie with a smartphone at a rally in Jaipur, India. (Vishal Bhatnagar/AFP/Getty Images)

The chart shows that smartphone ownership in advanced economies is higher than in emerging economies.

Mobile technology has spread rapidly around the world. Today, it is estimated that more than 5 billion people have mobile devices, and more than half of these connections are smartphones. But growth in mobile technology so far has been unequal, either nationwide or within it. People in advanced economies are more likely to have mobile phones - smartphones in particular - and more likely to use the internet and social media than people in emerging economies. For example, a median of 76% across the 18 advanced economies surveyed have a smartphone, compared to a median of only 45% in emerging economies.

Smartphone ownership can vary by country, and even across developed economies. While about nine in ten or more South Koreans, Israelis and the Netherlands own a smartphone, the ownership rate is closer to six in ten in other developed countries such as Poland, Russia and Greece. In emerging economies as well, smartphone ownership rates vary significantly, from a high of 60% in South Africa and Brazil to just around four in ten in Indonesia, Kenya and Nigeria. Among the countries surveyed, ownership was lowest in India, where only 24% reported having a smartphone.

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Caffeine is a bitter stimulant drug and is found in varying quantities in seeds, leaves, and so on. its formula is c8h10n4o2. ma

balu736 [363]

1) Answer is: there are 28 moles of hydrogen in 2.8 mol of caffeine.

Caffeine has molecular formula C₈H₁₀N₄O₂.

In one molecule of caffeine there are ten hydrogen atoms:

n(C₈H₁₀N₄O₂) : n(H) = 1 : 10.

n(C₈H₁₀N₄O₂) = 2.8 mol; amount of coffeine molecules.

2.8 mol : n(H) = 1 : 10.

n(H) = 2.8 mol · 10.

n(H) = 28 mol; amount of hydrogen atoms.

2) Answer is: there are 16 moles of carbon in 2.0 mol of caffeine.

In one molecule of caffeine (C₈H₁₀N₄O₂) there are eight carbon atoms:

n(C₈H₁₀N₄O₂) : n(C) = 1 : 8.

n(C₈H₁₀N₄O₂) = 2.0 mol; amount of the coffeine molecules.

2.0 mol : n(C) = 1 : 8.

n(C) = 2.0 mol · 8.

n(C) = 16 mol; amount of the carbon atoms.

3) Answer is: there are 1.6 moles of nitrogen in 0.4 mol of caffeine.

In one molecule of caffeine (C₈H₁₀N₄O₂) there are four nitrogen atoms:

n(C₈H₁₀N₄O₂) : n(N) = 1 : 4.

n(C₈H₁₀N₄O₂) = 0.4 mol; amount of the coffeine molecules.

0.4 mol : n(N) = 1 : 4.

n(N) = 0.4 mol · 4.

n(N) = 1.6 mol; amount of the nitrogen atoms.

4) Answer is: there are 7 moles of oxygen in 3.5 mol of caffeine.

In one molecule of caffeine (C₈H₁₀N₄O₂) there are two oxygen atoms:

n(C₈H₁₀N₄O₂) : n(O) = 1 : 2.

n(C₈H₁₀N₄O₂) = 3.5 mol; amount of the coffeine molecules.

3.5 mol : n(O) = 1 : 2.

n(O) = 3.5 mol · 2.

n(O) = 7 mol; amount of the oxygen atoms.

6 0

3 years ago

Read 2 more answers

Assume that matter does not consist of atoms. Show by example how this assumption leads to

Leviafan [203]

If matter was not composed of atoms, the law definite proportions and law of multiple proportions will not hold true because compound would have random composition.

<h3>What is the law of definite proportions and law of multiple proportions?</h3>

The law of definite proportions states that all pure samples of a compound contains the same element in a fixed mass ratio.

The law of multiple proportions states that if an element combines with another element to form more than one compound, the mass of the element combines with a fixed mass of the other element in whole number multiples ratios.

Assuming matter was not composed of atoms, the law definite proportions and law of multiple proportions will not hold true because, their will be no definite ratio or composition in compounds.

The law definite proportions and law of multiple proportions are required for the atomic theory as they help prove that matter consists of definite unique particles called atoms.

In conclusion, the existence of atoms is proved true by the law definite proportions and law of multiple proportions.

Learn more about law of multiple proportions at: brainly.com/question/2624012

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4 0

2 years ago

100 POINTS! PLEASE HELP! QUESTIONS ARE IN THE PICTURES. WILL GIVE BRAINLIEST, 5-STAR RATING, and THANKS. HALF-DONE ANSWERS WILL

Elenna [48]

Answer:

See Explanations....

Explanation:

NOTE => See attached graph.

1. 25-Turn Electromagnet

a. Strength of Batteries 1.5v vs 6.0v

6v:1.5v => 4:1 voltage ratio => That is, 6v battery is 4x voltage of 1.5v battery.

b. Ratio of Paperclips Picked Up

23clips(6v):6clips(1.5v) => 3.8clips(6v):1clip(1.5v)

That is, the 6 volt battery-EM picks up 3.8x more clips than the 1.5v battery-EM assuming constant number of coils given.

c. Empirical Relationship

From data given, an increase in voltage (V) produces a proportional increase in number of paperclips (C) picked up. Such is a Direct Relationahip between #Clips Picked Up and Battery Voltage.

Thus, C ∝ V => C = kV => k = C/V

Therefore, for k₁ = k₂ => C₁/V₁ = C₂/V₂

2. 50-Turn Electromagnet

a. Ratio of turns between electromagnets.

50-Turn EM : 25-Turn EM => 2:1 ratio of turns between electromagnets

b. Ratio of Paperclips Picked UP

Between maximum voltage and minimum voltages for 50-Turn EM

=> 47 clips (6v) : 13 clips (1.5v) => 3.6:1 ratio...

That is, the 6v battery-EM, on the average, picks up 3.6x more clips than the 1.5v battery-EM given 50-Turn EM.

3. Doubling number of coils:

Doubling the number of coils, on the average, doubles the number of clips picked up by either electromagnet.

Voltage 50-Turn EM 25-Turn EM Pick Up Ratio

1.5v 13 6 2:1

3.0v 26 12 2:1

4.5v 31 15.5 2:1

6.0v 47 23 2:1

4. Doubling Voltages:

Doubling voltage doubles the number of clips picked up by a given electromagnet regardless of the number of coils associated with magnet.

25-Turn EM Voltage Clips Pkd UP

1.5v 6

3.0v 12

Double voltage => Doubles # clips picked up*

50-Turn EM Voltage Clips Pkd UP

1.5v 13

3.0v 26

Double voltage => Doubles # clips picked up*

*Double Voltage => Double #clips picked up regardless of number of coil turns in electromagnet.

5. Predicting number of clips for 7.5v battery-EM

Using linear trendline equations shown on attached graphs...

#clips 50-Turn EM = 7.1333V + 2.5 = 7.1333(7.5) + 2.5 ≅ 56 clips

#clips 25-Turn EM = 3.6333V + 0.5 = 3.6333(7.5) + 0.5 ≅ 27 clips

Overall => 2:1 ratio of clips between 50-Turn EM and 25-Turn EM

6. Slope values based upon trendline equations shown on attached graphs are ...

25 Turn EM => slope = 3.6333

50 Turn EM => slope = 7.1333

Approximately a 2x increase upon doubling the number of coils of electromagnet.

Predicting number of clips for 1V electromagnets:

#Clips (1volt) 25-Turn EM = 3.6333(1) + 0.5 = 3.6833 ≅ 4 clips

#Clips (1volt) 50-Turn EM = 7.1333(1) + 2.5 = 9.6333 ≅ 10 clips

Shows to be consistent with double #clips with double number of coil turns.

6 0

3 years ago

Given the enthalpies of reaction below, determine the enthalpy change for the reaction: N2O (g) + NO2 (g) 3NO (g). N2 (g) + O2 (

lubasha [3.4K]

This problem applies Hess' Law to come up with the final reaction from a series of reactions given. Equation (1) stays as it is. Equation (2) should be inverted and divided by 2. Equation (3) is simply divided by 2. The energies should also correspond to the operations. Adding the net energies of each reaction, the total energy is 155.65 kJ. Hence, the answer is A.

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3 years ago

If you can smell a cleaning solution from across the room, you are experiencing the result of which liquid property?

lana [24]

The answer is D "Volatility"
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4 0

3 years ago

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