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Phoenix [80]
2 years ago
8

The glass hand bubbler holds a red liquid. When it heats up, do you see a chemical change or a physical change? How do you know?

Chemistry
1 answer:
Crank2 years ago
7 0

Answer:

Chemical change

Explanation:

Bubbles are usually a sign of a chemical reaction in the form of a gas so I would say this is a chemical change

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A man drove his car through the Nevada desert one day when the temperature was over 100°F. When he started the trip, the gas sta
Slav-nsk [51]
<span>The temperature in the tire increased, causing an increased tire pressure. :D</span>
7 0
3 years ago
In a lab experiment 80.0 g of ammonia [NH3] and 120 g of oxygen are placed in a reaction vessel. At the end of the reaction 72.2
valentinak56 [21]

The percent yield of the reaction : 89.14%

<h3>Further explanation</h3>

Reaction of Ammonia and Oxygen in a lab :

<em>4 NH₃ (g) + 5 O₂ (g) ⇒ 4 NO(g)+ 6 H₂O(g)</em>

mass NH₃ = 80 g

mol NH₃ (MW=17 g/mol):

\dfrac{80}{17}=4.706

mass O₂ = 120 g

mol O₂(MW=32 g/mol) :

\tt \dfrac{120}{32}=3.75

Mol ratio of reactants(to find limiting reatants) :

\tt \dfrac{4.706}{4}\div \dfrac{3.75}{5}=1.1765\div 0.75\rightarrow O_2~limiting~reactant(smaller~ratio)

mol of H₂O based on O₂ as limiting reactants :

mol H₂O :

\tt \dfrac{6}{5}\times 3.75=4.5

mass H₂O :

4.5 x 18 g/mol = 81 g

The percent yield :

\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{72.2}{81}\times 100\%=89.14\%

6 0
3 years ago
What was a Parthian battery?
timama [110]

Answer:

Scientists believe the batteries (if that is their correct function) were used to electroplate items such as putting a layer of one metal (gold) onto the surface of another (silver), a method still practiced in Iraq today.

Explanation:

8 0
3 years ago
Is this a model of an element, a compound, or a mixture? Explain your reasoning.
grandymaker [24]

Answer:

A mixture

Explanation:

Yes

6 0
3 years ago
An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level
topjm [15]
I think the answer that you are looking for is B but im not a 100% sure

4 0
3 years ago
Read 2 more answers
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