2 years ago

how often should gas appliances be checked for proper operation in order to prevent carbon monoxide poisoning?

Chemistry

1 answer:

yawa3891 [41]2 years ago

8 0

You should be checking your gas appliances every year, it should always be a qualified technician.

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What minimum volume of 0.200 m potassium iodide solution is required to completely precipitate all of the lead in 195.0 ml of a

lbvjy [14]

First, we write the reaction equation:

2KI + PbNO₃ → K₂NO₃ + PbI₂
The molar ratio of KI to PbNO₃ is 2 : 1
Moles of PbNO₃ present:
Moles = concentration (M) x volume (dm³)
= 0.194 x 0.195
= 0.038
Moles of KI required = 2 x 0.038 = 0.076 moles
concentration = moles / volume
volume = moles / concentration
= 0.076 / 0.2
= 0.38 L = 380 ml

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3 years ago

Water has a specific heat of 4.186 J/g*C. How much energy would be required to raise the temperature of 10 g of water by 10 C?

Sladkaya [172]

Energy(heat) required to raise the temperature of water : 418.6 J

<h3>Further explanation </h3>

Heat can be calculated using the formula:

Q = mc∆T

Q = heat, J

m = mass, g

c = specific heat, joules / g ° C

∆T = temperature difference, ° C / K

Specific heat of water = 4.186 J/g*C.

∆T(raise the temperature) : 10° C

mass = 10 g

Heat required :

$\tt Q=m.c.\Delta T\\\\Q=10\times 4.186\times 10\\\\Q=418.6~J$

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2 years ago

What is the lewis structure for al?

bogdanovich [222]

The abbreviation Al, with one dot on top of the abbreviation, one on the left, one on the right.

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2 years ago

Which of the following locations would experience the highest rate of sublimation?

g100num [7]

I think its the arctic ice caps

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3 years ago

Read 2 more answers

I need some chem help :(

alexandr402 [8]

Hi, can you post what you need help with??

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