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4 years ago

A car slowing down for a stop sign in an example of

Chemistry

2 answers:

Helen [10]4 years ago

3 0

The answer is a hope this helps!!!!!!

Fofino [41]4 years ago

3 0

Answer: Option (b) is the correct answer.

Explanation:

Acceleration means the rate of change of velocity of an object. Negative acceleration means a decrease in the velocity of an object. Positive acceleration means an increase in the velocity of an object.

When a car slows down for a stop sign then it is an example of negative acceleration as the speed of car is decreasing on seeing the stop signal.

Speed is the magnitude of velocity vector. Therefore, speed can never be negative.

Thus, we can conclude that a car slowing down for a stop sign is an example of negative acceleration.

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Silver+oxygen formula

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3 years ago

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4 years ago

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Apresenta somente ligação iônica: a. HF b.H2O c. HBr d. O2 e. NaBr

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4 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 :

4 NH₃ (g) + 5 O₂ (g) ⇒ 4 NO(g)+ 6 H₂O(g)

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 :

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

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3 years ago