If an object loses electrons it will become negatively charged. True False

n a certain city, electricity costs $0.18 per kW·h. What is the annual cost for electricity to power a lamp-post for 6.50 hours

Bond [772]

a)

Consumption of power in one day = $100 W \times 6.5 h = 650 Wh$

Consumption of power in one year = $100 W \times 6.5 h\times 365 = 237250 Wh$

Since, $1 Wh = 0.001 kWh$ . So,

$237250 Wh = 237.25 kWh$

Given that $1 kWh$ = $$0.18$

So, for $237.25 kWh$ :

$237.25 kWh\times$ $ $0.18/ kWh$ = $ $42.705$

Hence, the annual cost is $ $42.705$ .

b)

Consumption of power in one day = $25 W \times 6.5 h = 162.5 Wh$

Consumption of power in one year = $25 W \times 6.5 h\times 365 = 59312.5 Wh$

Since, $1 Wh = 0.001 kWh$ . So,

$59312.5 Wh = 59.3125 kWh$

Given that $1 kWh$ = $$0.18$

So, for $59.3125 kWh$ :

$59.3125 kWh\times$ $ $0.18/ kWh$ = $ $10.676$

Hence, the annual cost is $ $10.676$ .

6 0

3 years ago

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Describe general characteristics of potassium

Virty [35]

Leg crams are symptoms of lack of potassium

6 0

3 years ago

The picture represents the process that produces most of the energy used by living organisms on Earth. Which process is represen

forsale [732]

Wheres the pic i cant answer without the pic

6 0

3 years ago

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Consider the cell pt | h2 (1 atm); h+ (? m) || hg2cl2(s); cl− (1 m) | hg 2 h+ + 2 e − → h2 e 0 = 0.00 v hg2cl2 + 2 e − → 2 hg +

Dmitry [639]

Answer:

1.39

Explanation:

[Hg2Cl2]= 1M

[H^+] = ????

E°cell= 0.35V

E= 0.268 V

Therefore E for the reaction must -0.082 V

n= 2 moles of electrons

From Nernst Equation:

E= E°cell- 0.0592/n log [Red]/[Ox]

0.0268= 0.35- 0.0592/2 log 1/[Ox]^2

-0.082= -0.0296 log 1/[Ox]^2

log 1/[Ox]^2= 0.082/0.0296

log 1/[Ox]^2= 2.77

1/[Ox]^2=Antilog (2.77)

[Ox]^2=1.698×10^-3

[Ox] = 0.0412 M

But pH= -log [H^+]= -log(0.0412)= 1.385

3 0

3 years ago

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If red is the color on the top of the spectrum being emitted from the prism, what is the color on the bottom?

Elan Coil [88]

Answer:

violet

Explanation:

hope this helps!

5 0

3 years ago