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3 years ago

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Chemistry

2 answers:

Serjik [45]3 years ago

7 0

Answer:

we can talk here if u want

Explanation:

zhannawk [14.2K]3 years ago

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Can we talk here?
I don’t have what you want to talk on

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A sodium atom has 11 protons and 12 neutrons. What is the mass number of this sodium atom?

Jlenok [28]

Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.

3 0

3 years ago

Which polynomials, given in square inches, could represent the area of a square with whole number side lengths if x is a whole n

erica [24]

<u>Answer:</u> The correct answers are $x^2-9\text{ and }x^2-100$

<u>Explanation:</u>

To find the polynomials which could represent the are of a square having side x greater than 2, we need to find the value of 'x' for all the given polynomials.

From the given options:

1. $x^2-9$

$x^2=9\\x=\sqrt{9}\\x=3,-3$

x = -3 is ignored.

2. $x^2-100$

$x^2=100\\x=\sqrt{100}\\x=\pm10\\x=10,-10$

x = -10 is ignored

3. $x^2-4x+4$

To solve this we use the quadratic formula:

$\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

Putting values of a, b and c, we get:

$x=\frac{-(-4)\pm\sqrt{(-4)^2-4(1)(4)}}{2\times 1}\\x=2,2$

As, x comes out to be 2 and is not greater than 2. Hence, this is not considered.

4. $x^2+10x+25$

Solving for 'x' by splitting the middle term:

$\Rightarrow x^2+5x+5x+25\\\Rightarrow x(x+5)+5(x+5)\\x=-5,-5$

Hence, this is ignored.

5. $x^2+15x+36$

Solving for 'x' by splitting the middle term:

$\Rightarrow x^2+12x+3x+36\\\Rightarrow x(x+12)+3(x+12)\\x=-12,-3$

Hence, this is ignored.

So, the correct polynomials are $x^2-9\text{ and }x^2-100$

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3 years ago

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The actions described in the passage are best understood in the context of which of the following?

soldi70 [24.7K]

C
I have had this question on a test before!! Hope this helps

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4 years ago

__________ are composed of two or more covalently bonded atoms.

polet [3.4K]

Answer:

i think it is molecules.

Explanation:

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3 years ago

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What prefix should be used to name a hydrocarbon that has a six-carbon parent chain?a.hex- b.meth- c.non- d.sept-

liberstina [14]

A. hex- Normally with 6, the prefix is hex-. For example a polygon having 6 sides is known as hexagon.

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4 years ago