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3 years ago

What is an ""acid""? What is a ""base""?

Chemistry

1 answer:

pantera1 [17]3 years ago

5 0

Answer:

There are two definitions for acid and base in chemistry.

Explanation:

There are different definitions of Acid and Base:

The Arrhenius definition sais that acid is every substance that increases the concentration of protons in water. Thus, a base is a substance that increase the concentration of oxydriles in water.

On the other hand, the Bronsted definition sais that an acid is a substance with the ability to give protons and a base is a substance with the ability to accept protons.

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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]

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

Explanation:

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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4 years ago

Some fossils provide clues to the ....

chubhunter [2.5K]

Some fossils provide clues to the environment and climate of the time the organism lived.

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4 years ago

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What is the molarity of a solution with a volume of 974 mL containing 17 g of CuSO4

liberstina [14]

Answer : The correct option is, (A) 0.109 M $CuSO_4$

Solution : Given,

Mass of $CuSO_4$ = 17 g

volume of solution = 974 ml

Molar mass of $CuSO_4$ = 159.609 g/mole

Molarity : It is defined as the number of moles of solute present in one liter of solution.

Formula used :

$Molarity=\frac{w\times 1000}{M\times V_s}$

where,

w = mass of $CuSO_4$ (solute)

M = molar mass of $CuSO_4$

$V_s$ = volume of solution in liter

Now put all the given values in the above formula, we get the molarity of solution.

$Molarity=\frac{(17g)\times 1000}{(159.609g/mole)\times (974ml)}=0.109mole/L=0.109M$

Therefore, the molarity of the solution is, 0.109 M

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4 years ago

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What are three functions of the excretory system

Maru [420]

Answer:

Helps eliminate waste products such as urea, uric acid ammonia, and other products via urine.

It helps maintain the osmotic level of blood and plasma.

It helps maintain the electrolyte balance in the body.

And it also helps in the metabolism of those drugs that do not get metabolized in the liver.

Explanation:

"The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage to the body. The dual function of excretory systems is the elimination of the waste products of metabolism and to drain the body of used up and broken down components in a liquid and gaseous state"

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3 years ago