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nikklg [1K]
3 years ago
8

Please help quick the 6th question is “What is a catalyst?” (include all three parts)

Chemistry
1 answer:
allochka39001 [22]3 years ago
4 0
1. The reaction is exothermic.

2. I know this because the delta H is a negative number. (-802.4 kJ)

3. This means that this reaction releases heat.
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Name any <br>three kinds of mixtures with example​
sleet_krkn [62]

Answer:

Here are a few more examples:

Smoke and fog (Smog)

Dirt and water (Mud)

Sand, water and gravel (Cement)

Water and salt (Sea water)

Potassium nitrate, sulfur, and carbon (Gunpowder)

Oxygen and water (Sea foam)

Petroleum, hydrocarbons, and fuel additives (Gasoline)

Heterogeneous mixtures possess different properties and compositions in various parts i.e. the properties are not uniform throughout the mixture.

Examples of Heterogeneous mixtures – air, oil, and water, etc.

Examples of Homogeneous mixtures – alloys, salt, and water, alcohol in water, etc.

Explanation:

8 0
3 years ago
Read 2 more answers
A sample of oxygen occupies a volume of 150 cm3 at 72 C. What will be volume of oxygen when the temperature drops to 2 C?
Ksenya-84 [330]

Answer:

V₂ = 119.59 cm³

Explanation:

Given data:

Initial volume = 150 cm³

Initial temperature = 72°C

Final volume = ?

Final temperature = 2°C

Solution:

Initial temperature = 72°C (72 +273.15 K = 345.15 K)

Final temperature = 2°C (2 + 273.15 k = 275.15 K)

Solution:

According to the Charles Law.

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 150 cm³ × 275.15 K /345.15 K

V₂ = 41272.5 cm³.K / 298 K

V₂ = 119.59 cm³

8 0
3 years ago
Read 2 more answers
Pls help!!
Advocard [28]

Answer: D. 1600 L

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}

\text{Number of moles of nitrogen}==\frac{1000L}{22.4L}=44.6moles

\text{Number of moles of hydrogen}==\frac{2400L}{22.4L}=107.1moles

N_2(g)+3H_2(g)\rightarrow 2NH_3(g)  

According to stoichiometry :

3 moles of H_2 require 1 mole of N_2

Thus 107.1 moles of H_2 will require=\frac{1}{3}\times 107.1=35.7moles of N_2

Thus H_2 is the limiting reagent as it limits the formation of product and N_2 is the excess reagent.

As 3 moles of H_2 give = 2 moles of NH_3

Thus 107.1 moles of H_2 give =\frac{2}{3}\times 107.1=71.4moles  of NH_3

Volume of NH_3=moles\times {\text {Molar volume}}=71.4moles\times 22.4L/mol=1600L

Thus volume of ammonia produced is 1600 L

6 0
3 years ago
How is the periodic table organized?
joja [24]

Answer:

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.

Explanation:

8 0
3 years ago
Read 2 more answers
What is the name of this hydrocarbon? <br> A: propane<br> B: pentene<br> C: butene<br> D: ethane
avanturin [10]

I don't think it's any of the above. Because there is two double carbon bonds and it belongs to an alkene, it should be an ethene molecule.

3 0
3 years ago
Read 2 more answers
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