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2 years ago

8

The intermolecular forces between polymer molecules are strong, so these substances are __________ at room temperature. What wor

d completes the sentence?

1 answer:

geniusboy [140]2 years ago

8 0

Answer:

I want to say

Stronger

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How many moles are in 3.14 x 10^25 particles of tin?

lakkis [162]

Answer:

52.1409259 moles.........

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3 years ago

The exchange of carbon dioxide and oxygen takes place in the lungs. The specific site of gas exchange is the _____.

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Alveoli. I don't know what a nephron is but neurons and synapses are in the brain.

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4 years ago

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When you break an iron magnet into two pieces, you get ____.

Rudiy27

Answer:

two north poles and two south poles

Explanation:

A single magnet has a north pole and a south pole. If it is broken into two pieces, then each of the two pieces will have a north pole and a south pole.

No matter how many times or into how many pieces a magnet is broken, the resulting pieces will have two poles each.

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3 years ago

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B) How many moles of Na2O can be produced from 13.5 moles Na?

dolphi86 [110]

Answer: 6.75 moles of $Na_2O$ can be produced from 13.5 moles Na

Explanation:

The balanced chemical equation for formation of $Na_2O$ from Na is:

$4Na+O_2\rightarrow 2Na_2O$

According to stoichiometry :

4 moles of Na give = 2 moles of $Na_2O$

Thus 13.5 moles of $Na$ give = $\frac{2}{4}\times 13.5=6.75moles$ of $Na_2O$

Thus 6.75 moles of $Na_2O$ can be produced from 13.5 moles Na

3 0

3 years ago

Complete and balance each of the following equations. If no reaction occurs, enter NOREACTION.

Tatiana [17]

Answer

Part A:

Given equation:

$KI_{(aq)}+BaS_{(aq)}\rightarrow$

The above equation is an example of a double replacement reaction. A double replacement (or double displacement) reaction is a reaction in which the positive and negative ions of two ionic compounds exchange.

Note: The oxidation number of:

K = +1

I = -1

Ba = +2

S = -2

So, the complete chemical equation including phases of the given reaction is:

$2KI_{(aq)}+BaS_{(aq)}\rightarrow BaI_{2(aq)}+K_2S_{(s)}$

Part B:

Given equation:

$KCl_{(aq)}+CaS_{(aq)}\rightarrow$

Also, the equation is an example of a double replacement reaction.

Note: The oxidation number of:

K = +1

Cl = -1

Ca = +2

S = -2

The complete chemical equation including phases of the given reaction is:

$2KCl_{(aq)}+CaS_{(aq)}\rightarrow K_2S_{(s)}+CaCl_{2(aq)}$

5 0

2 years ago