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3 years ago

Can friction apply to wooden blocks?

Chemistry

1 answer:

qaws [65]3 years ago

8 0

Answer:

Explanation:

there is not room for atoms and no atoms = no energy ,no energy = no friction.i am sorry if you are confused

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Which statement is incorrect?

Katena32 [7]

Answer:

e. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added.

Explanation:

Which statement is incorrect?

Select one:

a. The volume of solution in the buret should be recorded when the endpoint is reached. CORRECT. At the endpoint, the titrant is expected to have completely reacted with the titrand.

b. It is good practice to place the flask over a white background to better observe the color change of the solution. CORRECT. Using a white background makes it easier to detect the changes in the color of the indicator.

c. The endpoint is when the indicator changes color. CORRECT. This is the function of an indicator.

d. Phenolphthalein will go from a colorless solution to a pink solution for the addition of NaOH to an acid solution. CORRECT. Phenolphthalein is colorless when pH < 8.3 and it is pink when pH > 10.0.

e. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added. INCORRECT. When the endpoint is reached, no more titrant should be added.

4 0

3 years ago

P+O2 → P4O10

Assoli18 [71]

The answer is B, this is a synthesis reaction. A good way to identify a synthesis reaction is when there are multiple reactants, but only one product.

6 0

3 years ago

Read 2 more answers

Group the following electron configurations in pairs that would represent similar chemical properties at their atoms;

marishachu [46]

Answer: Pairs are: (a) and (d), (b) and (f), (c) and (e)

Explanation:

In a periodic table, elements are arranged in 18 vertical columns known as groups and 7 horizontal rows known as periods.

Elements arranged in a group show similar chemical properties because of the presence of same number of valence electrons.

Valence electrons are defined as the electrons which are present in the outermost shell of an atom. Outermost shell has the highest value of 'n' that is principal quantum number.

For the given options:

For a:

The given electronic configuration is: $1s^22s^22p^63s^2$

The number of valence electrons in the given configuration are 2

For b:

The given electronic configuration is: $1s^22s^22p^63s^3$

The number of valence electrons in the given configuration are [2 + 3] = 5

For c:

The given electronic configuration is: $1s^22s^22p^63s^23p^64s^23d^{10}4p^6$

The number of valence electrons in the given configuration are [2 + 6] = 8

For d:

The given electronic configuration is: $1s^22s^2$

The number of valence electrons in the given configuration are 2

For e:

The given electronic configuration is: $1s^22s^22p^6$

The number of valence electrons in the given configuration are [2 + 6] = 8

For f:

The given electronic configuration is: $1s^22s^22p^63s^23p^3$

The number of valence electrons in the given configuration are [2 + 3] = 5

Electronic configuration of (a) and (d) will form a pair, (b) and (f) will form a pair, (c) and (e) will form a pair and will have similar chemical properties.

Hence, the pairs are: (a) and (d), (b) and (f), (c) and (e)

4 0

3 years ago

How many moles are in 8.35 g of H2O?

AlexFokin [52]

It’s is 130 that is the answer!!!!

8 0

1 year ago

What must happen in a chemical reaction?

klasskru [66]

The anwser is atoms are destroyed

6 0

3 years ago