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Salsk061 [2.6K]
3 years ago
15

The nucleus is:

Chemistry
1 answer:
julsineya [31]3 years ago
8 0
The Nucleus is the center of the atom. What specifies the atom number is the amount of protons it has so it wouldn't  be B.  The number of nucleons (both protons and neutrons) in the nucleus is the atom's <span>mass number.</span>
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Scientific knowledge can withstand the test of time because A. exceptions can be made regarding scientific laws. B. it is open t
Iteru [2.4K]

B. It is open to change as new evidence or data is discovered. If scientists discover new evidence, they must modify their theories to conform with the new data.

A. is <em>incorrect</em>. Scientific laws are so well established that there can be no exceptions.

C. is <em>incorrect</em>. A scientific theory is the collective judgement of scientists as to the best explanation for a phenomenon. A new observation may require modification of the theory.

D. is <em>incorrect</em>. Advancements in technology can provide new evidence that requires new explanations.

5 0
3 years ago
Read 2 more answers
A- south<br> B- north <br> C-west<br> D- east <br> Help ASAP no links or I’m reporting
Agata [3.3K]

Answer:

east

Explanation:

5 0
3 years ago
Does anybody know how to do this if so please help !
Viktor [21]

Answer:

add x to 7 and divide by 3

Explanation:

easier formula

3 0
2 years ago
How many grams of H2O can be made from the combustion of 3.75 liters of C7H14 and an excess of O2 at STP?
Kitty [74]

Answer:

21.10g of H2O

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2C7H14 + 21O2 —> 14CO2 + 14H2O

From the balanced equation above, 2L of C7H14 produced 14L of H2O.

Therefore, 3.75L of C7H14 will produce = (3.75 x 14)/2 = 26.25L of H2O.

Next, we shall determine the number of mole of H2O that will occupy 26.25L at stp. This is illustrated below:

1 mole of a gas occupy 22.4L at stp

Therefore, Xmol of H2O will occupy

26.25L i.e

Xmol of H2O = 26.25/22.4

Xmol of H2O = 1.172 mole

Therefore, 1.172 mole of H2O is produced from the reaction.

Next, we shall convert 1.172 mole of H2O to grams. This is illustrated below:

Number of mole H2O = 1.172 mole

Molar mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O =..?

Mass = mole x molar mass

Mass of H2O = 1.172 x 18

Mass of H2O = 21.10g

Therefore, 21.10g of H2O is produced from the reaction.

3 0
3 years ago
Question 5
Stolb23 [73]

Answer:

There are 17.64% students received B+ grades.

Explanation:

It is given that,

Total number of students in chemistry class is 17

We need to find the percentage received by B+.

Number of students having B+ grades are 3 (from graph)

Required percentage = P=\dfrac{3}{17}\times 100=17.64\%

So, there are 17.64% students received B+ grades.

8 0
3 years ago
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