Answer:
Chemistry can be applicable in many aspects which are
i) At school, through getting knowledge you can assess different aspect of chemistry, eg production of Chemicals.
ii) At hospital, also chemistry can be applicable in hospital because most of medicine and other materials are made up from chemistry application.
iii) Agriculture, through agricultural materials it simply because you can get more efficient through planted by using manures and fertilizer which are made up from chemistry application.
Ammonia will decompose into nitrogen and hydrogen at high temperature. Calculate the pressure equilibrium constant for the decomposition of ammonia at the final temperature of the mixture
Answer:
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
Explanation:
The reaction for the decomposition of ammonia is given by;
2NH₃ (g) ⇌ N₂ (g) + 3H₂ (g)
The pressure equilibrium constant gives the ratio of the pressure of the product over reactants for a reaction that is at equilibrium.
The pressures of the species are raised to the powers of their respective coefficients.
In this reaction;
Products = N₂ (g) + 3H₂ (g)
Reactant = 2 NH₃ (g)
The pressure equilibrium constant (Kp) is given as;
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
How many moles of zinc are there in 0.890 g of zinc?
Answer:
There are
4.517
⋅
10
23
atoms of Zn in 0.750 mols of Zn.
Explanation:
Since we know that there are
6.022
⋅
10
23
atoms in every mole of a substance (Avogadro's Number), there are
6.022
E
23
⋅
0.750
atoms of Zn in 0.750 mols of Zn.
Answer:
There are 4.517 ⋅ 10 23 atoms of Zn in 0.750 mols of Zn. have a good day:)
Explanation:
Which of the following equations demonstrates an actual chemical reaction that forms a new substance?
A1: ZN + 2HCl → 2NCl2 + H2
A2: H2O + NaCl → H2O
A3: Zn + Al + Cu → Zn + Cu + Al
A4: C12H22O11 + H2O → H2O + C12H22O11
Answer: [tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]
Explanation:
A chemical reaction is said to have occured when reactants react to form new products where the atoms undergo a change in bonding.
From the given reactions:
1. [tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]
Here Zn combines with hydrochloric acid to form zinc chloride and hydrogen.
2. [tex]H_2O+NaCl\rightarrow H_2O[/tex]
Here water remains as such as no new substance is formed.
3. [tex]Zn+Al+Cu\rightarrow Zn+Cu+Al[/tex]
Here no new substance is formed.
4. [tex]C_{12}H_{22}O_{11}+H_2O\rightarrow H_2O+C_{12}H_{22}O_{11}[/tex]
Here no new substance is formed.
Thus [tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex] demonstrates an actual chemical reaction that forms a new substance
Answer:
hope this helps you!
Explanation:
write down any four uses of solution
.I will mark him\her as brilliant
Answer:
because it will help u
because it will make u to understand the question very well
PLEASE HELP WILL GIVE BRAINLEIST ASAP Determine the fraction of an original sample of K-42 that remains unchanged after 24.72 hours.
Answer:
25% or 0.25 or 1/4
Explanation:
don't know which form you need so here you have all 3
good luck :)
you take 295.5 g of a solid at 30.0 c and let it melt in 425 g of water. the water temperature decreases from 85.1 c to 30.0 c. calculate the heat of fusion of this solid
Answer:
[tex]\Delta _{fus}H=332 \frac{J}{g}[/tex]
Explanation:
Hello!
In this case, since the heat of fusion of a solid substance stands for the energy required to melt it, which is a phase transition from solid to liquid, we can see that the heat lost by water is that gained by the solid, so we can write:
[tex]Q_{solid}=-Q_{w}[/tex]
Thus, by using the water data and its specific heat (4.184), we obtain:
[tex]Q_{solid}=-m_{w}C_{w}(T_f-T_i)\\\\Q_{solid}=-425g*4.184\frac{J}{g\°C}*(30.0-85.1)\°C\\\\ Q_{solid}=97,978.82J=98.0kJ[/tex]
Next, since the heat of fusion of a substance is usually represented in terms of energy per amount of substance, we use the mass of solid to obtain:
[tex]\Delta _{fus}H=\frac{98.0kJ}{295.5g}\\\\ \Delta _{fus}H=0.332\frac{kJ}{g}=332 \frac{J}{g}[/tex]
Best regards!
The heat of fusion of the solid is 0.332 KJ/g or 332 J/g
We'll begin by calculating the heat loss by the water. This can be obtained as follow:
Mass of water (M) = 425 g
Initial temperature of water (T₁) = 85.1 °C
Final temperature (T₂) = 30 °C
Change in temperature (ΔT) = T₂ – T₁ = 30 – 85.1 = –55.1 °C
Specific heat capacity of water (C) = 4.184 J/gºC
Heat loss (Q) =?Q = MCΔT
Q = 425 × 4.184 × –55.1
Q = –97978.82 J
Divide by 1000 to express in KJ
Q = –97978.82 / 1000
Q = –97.98 KJ Finally, we shall determine the heat fusion of the solid.Heat loss by water = –97.98 KJ
Heat gained by the solid (Q) = 97.98 KJ
Mass of solid (m) = 295.5 g
Heat of fusion (Hf) =?Q = m•Hf
97.98 = 295.5 × Hf
Divide both side by 295.5
Hf = 97.98 / 295.5
Hf = 0.332 KJ/g or 332 J/gLearn more: https://brainly.com/question/15563205
calculate the packing efficiency of simple cubic unit cell.
Answer:
52.4%
Explanation:
Since a simple cubic unit cell contains only 1 atom. The packing efficiency of the simple cubic cell is 52.4 %
What is the mass of Na2CO3∙10H2O that is needed to make 100 ml of sodium carbonate solution with the mass percentage of Na2CO3∙ equal to 2%? The density of the final solution is equal to 1 g/ml.
first we find the mass of the final solution
we know that
density=mass/volume
we know the density and volume
1=m/100
m=100g
now we calculate the mass ofNa2CO3
2% of 100 is equal with 2g of Na2CO3
The diagram represents a plant leaf cell and two different molecules used in the process of photosynthesis. Molecule 1 and 2 are most likely
A. Carbon dioxide and water
B. Nitrogen and water
C. carbon dioxide and nitrogen
D. Nitrogen and oxygen
heyyy Powerpuff girls! what advantage does globe maps have over a flat map?
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Explanation:
miss girl- you could've just looked this up
(just make it look like you typed it)
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Friend?
27. The compound having only primary hydrogen atoms is ( ).
(A) isobutene
(B) 2,3-dimethylbutene
(C) cyclohexane
(D) propyne
Answer:
The correct answer is - (a) isobutene.
Explanation:
A 1° or primary hydrogen atom is one that is bonded to a 1° carbon atom; a 2° hydrogen atom is one that is connected to a 2° carbon atom; In isobutene only among all the all option having only primary hydrogen atoms. rest have secondary or teritary hydrogen atoms in them
C1∘H3≡CH: (only 1∘ hydrogen atoms)
Please help I need this done
Answer:
they arent alcohols.
Explanation: