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Andre45 [30]
3 years ago
6

At 1 atm of pressure and a temperature of 0 degrees celsius, which phases of H2O can exist?

Chemistry
1 answer:
NemiM [27]3 years ago
3 0
B, because water is changing its state from solid to liquid (it's fusion in portuguese, don't know in english), so while it's changing, water has 2 states at the same time.
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As long as narcotics are prescribed by a doctor, their use will not lead to addiction.
azamat
The correct answer is B. False. 

Narcotics have various use in the human body. No matter if the purpose of their use is killing pain, helping the patient to fall asleep easier, or helping the patient battle depression, there is always some danger in using them. Even though they have a different effect from drugs like cocaine and heroine, there are ingredients in many doctor-prescribed narcotics and medications who can lead to some sort of an addiction. In addition, lets not forget that the doctor cannot control how many pills are being taken per day. 
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2 years ago
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A 45.0 mL sample of 0.020 M acetic acid (HC2H3O2) is titrated with 0.020 M NaOH.? Determine the pH of the solution after adding
White raven [17]

Answer:

Explanation:

CH₃COOH + NaOH = CH₃COONa + H₂O .

.02M

CH₃COOH  = CH₃COO⁻ + H⁺

C                       xC             xC

Ka = xC . xC / C = x² C

1.8 x 10⁻⁵ = x² . .02

x² = 9 x 10⁻⁴

x = 3 x 10⁻²

= .03

concentration of H⁺ = xC = .03 . .02

= 6 x 10⁻⁴ M , volume =  45 x 10⁻³ L

moles of H⁺  = 6 X 10⁻⁴  x 45 x 10⁻³

= 270 x 10⁻⁷ moles

= 2.7 x 10⁻⁵ moles

concentration of NaOH = .0200 M , volume = 35 x 10⁻³ L

moles of Na OH = 2 X 10⁻²  x 35 x 10⁻³

= 70 x 10⁻⁵ moles

=  

NaOH is a strong base so it will dissociate fully .

there will be neutralisation reaction between the two .

Net NaOH remaining = (70 - 2.7 ) x 10⁻⁵ moles

= 67.3 x 10⁻⁵ moles of NaOH

Total volume = 45 + 35 = 80 x 10⁻³

concentration of NaOH after neutralisation.= 67.3  x 10⁻⁵ / 80 x 10⁻³ moles / L

= 8.4125  x 10⁻³ moles / L

OH⁻ = 8.4125  x 10⁻³

H⁺ = 10⁻¹⁴ / 8.4125  x 10⁻³

= 1.1887 x 10⁻¹²

pH = - log (  1.1887 x 10⁻¹² )

= 12 - log 1.1887

= 12 - .075

= 11.925 .

4 0
3 years ago
What is the density of an object having a mass of 16 g and a volume of 30 mL ?
Marizza181 [45]

Answer:

12

Explanation:

7 0
2 years ago
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Which of the following objects would float when placed in water? (Note: 1 mL 1 cm+3)*
liraira [26]

Only an apple will float when placed in water.

An object will float in water if its density is <em>less than that of water</em> (1.0 g/mL).

An object will sink in water if its density is <em>greater than that of water</em>.

Thus, solid objects made of <em>gold, iron, or rubber</em> will all sink in water.

6 0
3 years ago
The molar mass of H2O is 18.01 g/mol. The molar mass of O2 is 32.00 g/mol. What mass of H2O, in grams, must react to produce 50.
Annette [7]
This reaction is called the electrolysis of water. The balanced reaction is:
2H2O = 2H2 + O2
We are given the amount of O2 produced from the electrolysis reaction. This will be the starting point of our calculation.

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8 0
3 years ago
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