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3 years ago

Base your answers to questions 66 through 68 on the information below.

1 answer:

5 0

Atoms are divisible and can be broken down into smaller particles. We know these particles as protons, neutrons and electrons.

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What is 8.3 x 10^4 in standard form

seraphim [82]

Explanation:

83,000 is 8.3x10^4 in standard form

when it's a positive move decimal to the right as many as exponent say

if it's negative move decimal to left and and zeros till you move what exponent says

8 0

2 years ago

Describe what the specific heat capacity (c) tells us about a substance. *<br> Your answer

NeX [460]

Answer:

it tells us of the specific amount of energy required to change the state of one mole of a substance either from solid to liquid or liquid to gas and vice versa without change in temperature

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3 years ago

1 Copy and complete using the words below:

Aleks [24]

Answer:

The elements in__Group_ 0 of the Periodic Table are called the_noble__gases. They are generally __unreactive_. because they have a__full_outer shell of electrons. So they do not need to gain__lose_or share _electrons_ with other atoms.

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3 years ago

3. When substances cross cell membranes by simple diffusion, they

poizon [28]

Answer:B

Explanation:due to osmosis and osmoregulation of the cell membrane

3 0

3 years ago

Salicylic acid (C7H6O3) reacts with acetic anhydride (C4H6O3) to form acetylsalicylic acid (C9H8O4).

zavuch27 [327]

Answer : The correct option is, (B) Salicylic acid

Solution :

First we have to calculate the moles of salicylic acid and acetic anhydride.

$\text{Moles of }C_7H_6O_3=\frac{\text{Mass of }C_7H_6O_3}{\text{Molar mass of }C_7H_6O_3}=\frac{70g}{138.121g/mole}=0.507moles$

$\text{Moles of }C_4H_6O_3=\frac{\text{Mass of }C_4H_6O_3}{\text{Molar mass of }C_4H_6O_3}=\frac{80g}{102.09g/mole}=0.783moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$2C_7H_6O_3(aq)+C_4H_6O_3(aq)\rightarrow 2C_9H_8O_4(aq)+H_2O(l)$

From the balanced reaction we conclude that

As, 2 moles of salicylic acid react with 1 mole of acetic anhydride

So, 0.507 moles of salicylic acid react with $\frac{0.507}{2}=0.2535$ mole of acetic anhydride

The excess of acetic anhydride = 0.783 - 0.2535 = 0.5295 moles

That means the in the given balanced reaction, salicylic acid is a limiting reagent because it limits the formation of products and acetic anhydride is an excess reagent.

Hence, the limiting reagent is, salicylic acid.

7 0

2 years ago