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Maslowich
3 years ago
7

Students mixed 20 mL of white glue and 20 mL of water in a cup. They added three drops of food coloring to the mixture. Then, 15

mL of borax solution was stirred into the mixture. Once mixed, the students observed they could take the substance out of the cup and roll it around in their hands. They concluded that –
Chemistry
1 answer:
Dmitry_Shevchenko [17]3 years ago
8 0

Hi im here to help!

Answer: a chemical reaction occurred because a new substance was formed with new properties!

Explanation: when u mix glue water and borax it forms into a new substance which is a chemical reaction

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A sample of gas has a volume of 20.0 mL at STP. What will the volume be if the temperature is changed to 546 K and the pressure
Ostrovityanka [42]

The volume did not change, it remained at 20 ml

<h3>Further explanation</h3>

Given

20 ml a sample gas at STP(273 K, 1 atm)

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Required

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Solution

Combined gas Law :

\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}

Input the value :

\tt \dfrac{1\times 20}{273}=\dfrac{2\times V_2}{546}\\\\V_2=\dfrac{1\times 20\times 546}{273\times 2}\\\\V_2=20~ml

The volume does not change because the pressure and temperature are increased by the same ratio as the initial conditions (to 2x)

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The atoms of Group 7A elements gain electrons when they form ions.<br><br> True<br> False
artcher [175]
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Explanation.

The group 7A is actually named group 17.

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