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3 years ago

Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state

Chemistry

2 answers:

masya89 [10]3 years ago

8 0

Answer:

The temperature is always lower

Explanation:

Cloud [144]3 years ago

6 0

Answer:

The temperature is always lower.

Explanation:

The temperature is always lower at the end of the state as compared to beginning of the state. We can see in the given data, the temperature is higher at the beginning i. e. 140 degree Celsius but with the passage of time, the temperature of a state decreases constantly and the temperature at the end is lower i. e. 20 degree Celsius. So we can conclude that the temperature is always lower.

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The following data was collected when a reaction was performed experimentally in the laboratory.

REY [17]

Answer:

The answer to your question is 3 moles of AlCl₃

Explanation:

Process

1.- Write and balance the equation

Al(NO₃)₃ + 3NaCl ⇒ 3NaNO₃ + AlCl₃

2.- Determine the limiting reactant

Theoretical proportion 1 mol Al(NO₃)₃ : 3 moles of NaCl

Experimental proportion 4 moles Al(NO₃)₃ : 9 moles NaCl

From these values, we determine that the limiting reactant is NaCl because the number of moles increases three times and the number of moles of Al(NO₃)₃ increases four times.

3.- Determine the amount of AlCl₃ using proportions

3 moles of NaCl --------------- 1 mol of AlCl₃

9 moles of NaCl ---------------- x

x = (9 x 1) / 3

x = 9 /3

x = 3 moles

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3 years ago

Calculate the weight of 5 atoms of Mg.

kumpel [21]

Answer:

2.0179701e-22

Explanation:

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3 years ago

A CO2 fire extinguisher is used for which type of fire?

zlopas [31]

Answer:

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3 years ago

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When are conservation efforts most effective? a. Conservation efforts are most effective when multiple groups cooperate. b. Cons

alexandr402 [8]

Conservation efforts most effective if <span>Conservation efforts are most effective when multiple groups cooperate. The answer is letter A. The rest of the choices do not answer the question above</span>

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4 years ago

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How do you balance a chemical equation

Dominik [7]

There should be mass balance and the charge balance between the reactants and the products

Mass balance : total no of individual atoms of each type should be balanced before and after the reaction

Charge balance : Overall charge of the reactants should be balanced with the overall charge of the products

You can balance,

1)by just looking at it

2)by Algebraic method given above or

3)by the redox method

You need to know how to get the oxidation numbers in order to use the oxidation method

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3 years ago