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Calculate the relative formula mass for KMnO4

GarryVolchara [31]

Explanation:

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4 0

2 years ago

Which atomic model propose that electrons move in specific orbits around the nucleus of an atom

tamaranim1 [39]

Answer: Bohr's

Explanation:

5 0

3 years ago

Question 1 (True/False Worth 2 points) (04.03 LC) When Pb and AlCl3 react together, lead (Pb) can replace aluminum (Al) in the c

aivan3 [116]

Answer:

For 1: The correct answer is false.

For 2: The correct answer is $Na_3PO_4+3KOH\rightarrow 3NaOH + K_3PO_4$ , because K retains the same charge throughout the reaction.

For 3: The correct answer is $Zn+H_2SO_4\rightarrow ZnSO_4 + H_2$

For 4: The correct answer is a single replacement reaction takes place because sodium is more reactive than hydrogen.

For 5: The correct answer is False.

For 6: The correct answer is it is a single replacement reaction, and the cations in the two ionic compounds are different.

Explanation:

For 1:

This type or reaction is based on the reactivity series. If the metal which lies above in the series will replace the metal which lies below in the series easily.

From the reactivity table attached below, we know that lead lies below in the series to Aluminium and hence, it will not replace in the reaction.

$Pb+AlCl_3\rightarrow \text{No reaction}$

Hence, the correct answer is False.

For 2:

A balanced equation is defined as the equation in which there are same number of atoms present on the reactant side and the product side.

The balanced equation always follow Law of Conservation of Mass.

So, from the given options, the below equation is the balanced equation because K retains the same charge throughout the reaction.

$Na_3PO_4+3KOH\rightarrow 3NaOH + K_3PO_4$

For 3:

A single displacement reaction is a type of chemical reaction in which one element replaces another element in a chemical reaction. The element which is more reactive will replace the less less reactive element.

This is explained by reactivity series as the metal which lies above in the series will replace the metal which lies below in the series easily. From the given equations, the equation which is a type of single displacement reaction is:

$Zn+H_2SO_4\rightarrow ZnSO_4 + H_2$

$Ba(OH)_2+H_2SO_4\rightarrow BaSO_4 + 2H_2O$ : This equation is a type of double displacement reaction.

$2Mg+O_2\rightarrow 2MgO$ : This equation is a type of combination reaction.

$H_2O+CO_2\rightarrow H_2CO_3$ : This equation is a type of combination reaction.

For 4:

A single displacement reaction is a type of chemical reaction in which one element replaces another element in a chemical reaction.

$A+BC\rightarrow AC+B$

A double displacement reaction is a type of chemical reaction in which exchange of ins takes place.

$AB+CD\rightarrow AD+BC$

In the question, it is asked that sodium metal is reacting with water to produce hydrogen gas and sodium hydroxide. This reaction is a type of single displacement reaction because sodium is more reactive than hydrogen as shown in the reactivity series.

$2Na+2H_2O\rightarrow H_2+2NaOH$

For 5:

A single displacement reaction is a type of chemical reaction in which one element replaces another element in a chemical reaction. This reaction will not follow when an element replaces similar element.

Hence, the statement is False.

For 6:

For the reaction:

$\text{Metal + Ionic compound}\rightarrow \text{Metal + Ionic compound}$

It is a type single replacement reaction as the cations in the two ionic compounds are different.

For Example:

$3Na+AlCl_3\rightarrow 3NaCl+Al$

Where, Sodium and Aluminium are the cations and chlorine is an anion.

6 0

3 years ago

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Calculate the amount of heat in kilojoules required to vaporize 2.58 kg of water at its boiling point.

givi [52]

Answer:

The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.

Explanation:

A substance undergoes a change in temperature when it absorbs or gives up heat to the environment around it. However, when a substance changes phase it absorbs or gives up heat without causing a change in temperature. The heat Q that is necessary for a mass m of a certain substance to change phase is equal to:

Q = m*L

where L is called the latent heat of the substance.

In this case:

m=2.58 kg
The heat of vaporization of water is L=2260*10³ J/kg

Replacing:

Q= 2.58 kg* 2260*10³ J/kg

Q= 5,830,800 J = 5,830.8 kJ (Being 1,000 J= 1 kJ)

The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.

3 0

3 years ago

Collisions of helium atoms with the walls of a closed container cause

iogann1982 [59]

1) Option b: gas pressure.

This is sustainted by the kinetic molecular theory of the gases.

2) Option c: raising the temperature of the gas will increase the pressure if the volumen of the gas and the number of particles are constant.

PV = nRT

If V and n are constant, P is proportional to T, then if T increase P will increase too.

5 0

3 years ago

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