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2 years ago

Scientists use scientific notation to represent very small or very large numbers because this notation increases the

Chemistry

2 answers:

katrin [286]2 years ago

6 0

convenience in using the numbers. is right

Tems11 [23]2 years ago

3 0

...because this notation increases the convenience in using the numbers

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What is the mass of 4.42 cm3 of platinum? The density of platinum is 22.5 g/cm3. (Sig Fig rules + units)

fgiga [73]

Answer: 99.45 g

Explanation: we have 22.5 g of Platinum in every 1cm3 of Platinum so if we take 4.42 cm3 of Platinum we will have 4.42 × 22.5 g = 99.45 g of Platinum

7 0

2 years ago

What is simple displacement reaction???give examples.

VARVARA [1.3K]

Answer:

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3 0

2 years ago

1. It is the place near the coast where sea water and fresh water mixes and is called “nurseries

lawyer [7]

Answer:

Estuaries are often called the “nurseries of the sea”

Explanation:

Because so many marine animals reproduce and spend the early part of their lives there.

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2 years ago

Method A: Does not transfer heat through solids and requires a medium for heat transfer Method B: Requires a material medium and

Paha777 [63]

Method A is Convection

Method B is Conduction

Explanation:

From the problem, we can infer that method A is convection and method B is conduction.

Conduction, convection and radiation are the three main methods of heat transfer.

Conduction and convection requires material medium to propagate.
Radiation occurs in the absence of a material medium.
Conduction mostly occurs in solid. Here, heat is transferred from one hot end to the cold end of the solid. The vibration of the particles in the hot end causes the transfer of kinetic energy to the cold end until thermal equilibrium is reached.
In convection, heat is primarily transferred in fluids as a result of density differences. Convection involves the motion of the materials of the medium. Hot air is light and it rises whereas cold air is dense and it sinks.

Learn more:

Sun brainly.com/question/1140127

#learnwithBrainly

6 0

3 years ago

Calculate the acid dissociation constant of a weak monoprotic acid if a 0.5M solution of this acid gives a hydrogen-ion concentr

RUDIKE [14]

Let the acid be HA.
The chemical formula for this acid will be the following:

$HA \rightleftharpoons H^{+}+A^{-}$

The formula for the <span>acid dissociation constant will be the following:

</span> $K_a= \dfrac{[H^+][A^-]}{[HA]}$
<span>
We know [H+]=0.0001 (it's given).
However, we must find [A-] and [HA] in order to solve for the constant.

We find that [A-]=[H+] by using a electroneutrality equation.
Also, we can create a concentration equation to find [HA].

</span> $0.5M=[A^-]+[HA]$
$[HA]=0.5M-[A^-]$
<span>
Now, we can find the acid dissociation constant.

</span> $K_a= \dfrac{[H^+][A^-]}{0.5M-[A^-]}$

$= \dfrac{0.0001*0.0001}{0.5-0.0001} = 2.0*10^{-8}$

4 0

2 years ago