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3 years ago

The chemical equation, 2 Cr + 3 Fe(NO3)2 - 3 Fe + 2 Cr(NO3)3, is an

Chemistry

1 answer:

lana66690 [7]3 years ago

6 0

Answer:

Single replacement reaction (aka single displacement reaction)

Explanation:

In a single replacement reaction, one element is substituted for another in a compound to create a new compound and a new element in the products. The general form is:

A + BC --> B + AC

In the case of this question, Cr and Fe "trade places."

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Does the temperature of the solvent (water) affect the rate of dissolving?

gregori [183]

Yes. Heating up the solvent gives the molecules more kinetic energy. The more rapid motion means that the solvent molecules collide with the solute with greater frequency and the collisions occur with more force. Both factors increase the rate at which the solute dissolves.

3 0

3 years ago

How do I balance this equation? ?KNO3 → ?K2O + ?N2(g)+ ?O2(g) and what type of reaction is it?

nirvana33 [79]

Answer:

4KNO3 ==> 2K2O + 2N2 + 5O2

Explanation:

It's a decomposition, but not a simple one.

KNO3 ==> K2O + N2 + O2 I don't usually do this, but I think the easiest way to proceed is to balancing the K and N together. That will require a 2 in front of KNO3

4KNO3 ==> 2K2O + 2N2 + 5O2

Now you have (3*4) = 12 oxygens. Two are on the K2O. So the other 10 must be on the O2

That should do it.

3 0

3 years ago

When bromine water is shaken with a liquid organic compound it is rapidly

dybincka [34]

answer:

This allows us to tell alkenes apart from alkanes using a simple chemical test. Bromine water is an orange solution of bromine. It becomes colourless when it is shaken with an alkene. Alkenes can decolourise bromine water, but alkanes cannot.

explanation:

5 0

2 years ago

Calculate the specific heat in J/(g·ºC) of an unknown substance if a 2.50-g sample releases 12.0 cal as its temperature changes

Degger [83]

Answer:

$\fbox{c = - 4.01 \: joule/g°C}$

Step by step explanation:

Given:

Mass of given sample (m) = 2.50 g

Initial temperature (T1) = 25°C

Final temperature (T2) = 20°C

Heat Energy Q = 12 cal

To find:

 $Specific \: Heat \: c = \: ?$ 

Solution:

We know that,

Specific heat of any substance is directly proportional to the mass and change in temperature.

Represented by equation,

$Q = mc \triangle T$

Where,

Q = Heat Energy

m = mass of given sample

c = specific heat

∆T = change in temperature

Substituting corresponding values,

$Q = mc \triangle T \\ 12 = 2.5\times c \times (20-25) \\ c = \frac{12}{2.5 \times ( - 5)} \\ c = - 0.96 \: cal/g°C \\$

We also know that,

$1 \: cal = 4.184 \: joules$

multiplying above answer by 4.184,

$c = - 0.96 \times 4.184 \\ \fbox{c = - 4.01 \: joule/g°C}$

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6 0

3 years ago

Find the volume of hydrogen gas formed when 1.5g of aluminum reacts with aq NaOH at 27 degrees Celcius.

soldier1979 [14.2K]

Answer:

1.33litres

Explanation:

number of moles of aluminum is 1.5/27

comparing mole ratio of between aluminum and hydrogen which is 1:1, the moles of hydrogen is also 1.5/27,

volume of hydrogen at 27 degrees Celsius (room temperature) is 1.5/27*24litres= 1.33 litres

5 0

2 years ago