1 According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another?A The volume and the shape stay the same.
B The volume increases to fill the new container, but the shape stays the same.
C The volume stays the same, but the shape changes to fit the new container.
D The volume and the shape change to fill the new container.
2 Which of these correctly defines the pH of a solution?
A the negative log of the hydronium ion concentration
B the log of the hydronium ion concentration
C the negative log of the hydroxide ion concentration
D the log of the hydroxide ion concentration
Answers
Answer 1 : The correct option is C.
Explanation :
The property of liquid is, they have fixed volume but do not have fixed shape. when a liquid is transferred from one container to another then the volume remains the same, but the shape changes according to the shape of the container.
Answer 2 : The correct option is A.
Explanation :
pH : It is defined as the negative logarithm of the hydronium ion concentration.
The expression of pH is,
2) A
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Answers
Answer:
The mass of sodium reacted is 138 grams
Explanation:
Firstly, the chemical reaction should be represented with a balance chemical equation. The chemical equation can be written as follows.
Na = sodium
Cl2 = chlorine gas
Na + Cl2 → NaCl
The balanced equation is
2Na(s) + Cl2(g) → 2NaCl(aq)
Atomic mass of sodium = 23 grams per mol
Atomic mass of chlorine = 35.5 grams per mol
From the chemical equation the molar mass are as follows
Sodium = 2 × 23 = 46 grams
Chlorine = 35.5 × 2 = 71 grams
Sodium chloride = 2 × 23 + 2 × 35.5 = 117 grams
if 46 grams sodium reacted to produce 117 grams of sodium chloride
? grams of sodium react to produce 351 grams sodium chloride
grams of sodium reacted = (351 × 46)/117
grams of sodium reacted = 16146/117
grams of sodium reacted = 138 grams
Answer:
0.138 kg of Na.
Explanation:
Equation of the reaction
2Na(aq) + Cl2(g) --> 2NaCl(s)
By stoichiometry, since 2 moles of Na reacted with 1 mole of Cl2 to produce 2 moles of NaCl. Therefore,
Calculating the number of moles present,
Cl2:
Number of moles = mass/molar mass
Molar mass of Cl2 = 35.5 * 2
= 71 g/mol.
= 213 * 71
= 3 moles.
NaCl:
Molar mass = 23 + 35.5
= 58.5 g/mol.
Number of moles = mass/molar mass
= 351/58.5
= 6 moles.
Since they both have equal moles,
Mass of Na = number of moles * molar mass
Molar mass of Na = 23 g/mol
= 23 * 6 moles
= 138 g
= 0.138 kg of Na.
FALSE
Answers
b) holds less dissolved oxygen than cold water
c) is beneficial to living organisms in aquatic ecosystems
d) contains more hydrogen than cold water
Answers
Hot water holds less dissolved oxygen than cold water.
Answers
Answer is: D. substitution.
Substitution reaction or single displacement reaction is a chemical reaction in which one functional group in a chemical compound is replaced by another functional group.
Balanced chemical reaction: CH₃Br(aq) + OH⁻(aq) → CH₃OH(aq) + Br⁻(aq).
In this balanced chemical reaction hydroxy group OH⁻ replaced one atom of bromine (Br⁻) in methyl bromide (CH₃Br).
Answer : The correct option is, (D) Substitution reaction.
Explanation :
Addition reaction : It is a type of reaction in which a molecule combined with the another molecule to give a new larger molecule.
The general representation of this reaction is,
Condensation reaction : It is a type of reaction in which two molecules combine to form a larger molecule and also producing a smaller molecule such as water.
Elimination reaction : It is a type of reaction in which the loss of elements from the starting material to form a double bond in the product.
The general representation of this reaction is,
Substitution reaction : It is a type of reaction in which one functional group is replaced by the another functional group.
The general representation of this reaction is,
(B and C are the two different functional groups)
In the given reaction, Br (functional group) is replaced by the hydroxide ion (functional group). So, this reaction is a substitution reaction.
Hence, the given reaction is a substitution reaction.
Answers
The mass of Sodium hydroxide which is needed to make 2.500 L of a 2.000 M NaOH solution is 200 grams.
How do we calculate mass from moles?
Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass
Given that, molarity of NaOH = 2M
Volume of NaOH solution = 2.5L
Moles of NaOH will be calculated by using the below equation as:
M = n/V
n = (2)(2.5) = 5 moles
Now we calculate the mass of NaOH of 5 moles as:
W = (5mol)(40g/mol) = 200g
Hence option (4) is correct.
To know more about moles, visit the below link:
Answer:
d
Explanation:
Answers
The hydrogen atom has only one electron which is present in the first shell.
We know that first shell can hold a maximum of two electrons so due to incomplete valance shell hydrogen atom is reactive and make covalent bond with other reactive atoms. This bonding will complete its valance shell and finish its reactive nature. In the second shell and other shells can hold 8 electrons so we can conclude that hydrogen has one valance electron.
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