CHEMISTRY HIGH SCHOOL

Most reactions between an acid and a base form a salt and water. Which term describes an acid-base reaction?A. single-replacement reaction

B. decomposition

C. double-replacement reaction

D. synthesis

Answers

Answer 1
Answer:

Answer: Option (C) is the correct answer.

Explanation:

It is given that when an acid and a base form a salt and water.

For example, HCl + NaOH \rightarrow NaCl + H_(2)O

Therefore, in this type of reactions there is exchange of ions between the two compounds hence, it is known as double-displacement reaction.

Thus, we can conclude that out of the given options the term an acid and a base form a salt and water describes an acid-base reaction.
Answer 2
Answer: c, a double-replacement reaction

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Answers

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Help Please earth science

Answers

Use the image to determine which of the following statements is true?

1) The granite is younger than unit B.2) Unit B and the granite are the same age.3) The relative ages of teh granite and unit B cannot be determined from the information given.4) Unit B is younger than the granite.

Solutions of aluminum nitrate and sodium sulfate react to form sodium nitrate and aluminum sulfate. Classify this reaction. 2AL(NO3)3(Aq)+3Na2SO4(Aq) ---> AL2(SO4)3(s)+6NaNO3(aq)

A) synthesis
B) decomposition
C) single replacement
D) double replacement

Answers

Answer:

Double replacement.

Explanation:

In the given reaction, there is not synthesis of compound.

The decomposition reactions are those in which a compound dissociates into simpler molecules or ions.

So the given reaction is not decomposition even.

In single replacement reactions, there is replacement of one group from a compound to other compound or element or ion.

Here two groups are being replaced (sulfate and nitrate) so the given reaction will be classified as double replacement.
2 Al(NO₃)₃ + 3 Na₂SO₄ = Al₂(SO₄)₃ + 6 NaNO₃

Aluminium Nitrate + Salt Cake = Aluminium Sulfate + Sodium Nitrate

Answer D  ( double replacement )

hope this helps!

Which layer of the Epidermis contains flat dead cells filled with keratin and surrounded by lipids? (a) Stratum Spinosum (b) Stratum Squamosum (c) Stratum Lipidosum (d) Stratum Corneum

Answers

D. Stratum Corneum

The layer of the epidermis that contains flat, dead cells filled with keratin and surrounded by lipids is (d) Stratum Corneum. This layer is the outermost layer of the epidermis and serves as a protective barrier for the skin, preventing the loss of water and protecting against external pathogens and environmental factors. The accumulation of keratin and lipids in the stratum corneum gives it its characteristic properties.

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,

pH=-log[H_3O^+]
1) C
2) A
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Hope this helps you and others in the future!

What mass of a 60.0-gram sample of N-16 will remain unchanged after 28.8 seconds?

Answers

The answer is 3.75 g.

Half-life is the time required for the amount of a sample to half its value.
To calculate the fraction of the sample remained unchanged, we will use the following formulas:
1. (1/2)^(n) = x,
where:
n - a number of half-lives
x - a remained fraction of a sample

2. t_(1/2) = (t)/(n)
where:
t_(1/2) - half-life
t - total time elapsed
n - a number of half-lives

The half-life of N-16 is 7.13.
So, we know:
t = 28.8 s
t_(1/2) = 7.13 s

We need:
n = ?
x = ?

We could first use the second equation, to calculate n:
If:
t_(1/2) = (t)/(n),
Then: 
n = (t)/( t_(1/2) )
⇒ n = (28.8 s)/(7.13 s)
⇒ n=4.04
⇒ n ≈ 4

Now we can use the first equation to calculate the remained amount of the sample.
(1/2)^(n) = x
⇒ x=(1/2)^4
⇒x= (1)/(16)


If the fraction of the sample is 1/16 = 6.25%, then the mass of the sample could be calculated as:
x g : 6.25% = 60 g : 100% 
x = 
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