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Naddika [18.5K]
3 years ago
13

5. Which of the following is a synthesis reaction? (2 points)

Chemistry
2 answers:
gulaghasi [49]3 years ago
8 0
2H2 + O2 = 2H2O since two elements created a compound, in this case water.
dezoksy [38]3 years ago
7 0

<u>Answer:</u> The correct answer is 2H_2+O_2\rightarrow 2H_2O

<u>Explanation:</u>

Synthesis reaction is defined as the reaction in which two smaller substances combine together to form a large single compound.

A+B\rightarrow AB

From the given options:

<u>Option A:</u>  2H_2+O_2\rightarrow 2H_2O

This is a synthesis reaction and only one product is forming.

<u>Option B:</u>  2H_2O_2\rightarrow 2H_2O+O_2

This is a decomposition reaction.

<u>Option C:</u>  CaCO_3\rightarrow CaO+CO_2

This is a decomposition reaction.

<u>Option D:</u>  2AgNO_3+Zn\rightarrow 2Ag+Zn(NO_3)_2

This is a single displacement reaction.

Thus, the correct answer is 2H_2+O_2\rightarrow 2H_2O

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Grease is applied to the moving part of machine. <br>​
RideAnS [48]

Answer:

Explanation:

The moving part won't move on its own there's a force but the force isn't enough for something like a bike chain it need grease to move smoothly or else it will just be super stuck or slow.

6 0
2 years ago
Read 2 more answers
How much water (H2O ) would form if 4.04 g of hydrogen (H2) reacted with 31.98 g of oxygen (O2 )?
Norma-Jean [14]

Answer:

Mass = 36 g

Explanation:

Given data:

Mass of water formed = ?

Mass of hydrogen = 4.04 g

Mass of oxygen = 31.98 g

Solution:

Chemical equation:

2H₂ + O₂   →   2H₂O

Number of moles of hydrogen:

Number of moles = mass/molar mass

Number of moles = 4.04 g/ 2 g/mol

Number of moles = 2.02 mol

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 31.98 g/ 32 g/mol

Number of moles = 1.0 mol

Now we will compare the moles of water with hydrogen and oxygen.

                O₂         :         H₂O

                 1           :           2

                H₂         :         H₂O

                 2          :          2

               2.02       :      2.02

Number of moles of water formed by oxygen are less thus oxygen will limiting reactant.

Mass of water:

Mass = number of moles × molar mass

Mass = 2 mol × 18 g/mol

Mass = 36 g

8 0
2 years ago
A balloon vendor at a street fair is using a tank of helium to fill her balloons. The tank has a volume of 124.0 L and a pressur
amm1812

Answer:

She lost 50.88 moles

Explanation:

Step 1: Data given

The volume of the tank = 124.0 L

The initial pressure = 104.0 atm

The temperature = 24.0 °C = 297 K

The pressure drops to 94.0 atm

The temperature stays constant at 297 K

Step 2: Calculate the initial number of moles

p*V = n*R*T

n = (p*V)/(R*T)

⇒with p = the initial pressure = 104.0 atm

⇒with V = the initial volume = 124.0 L

⇒with n = the initial number of moles = TO BE DETERMINED

⇒with R = the gas constant = 0.08206 L*atm/mol*K

⇒ with T = the temperature= 297 K

n = (104.0*124.0)/(0.08206*297)

n = 529.14 moles

Step 3: Calculate final number of moles

p*V = n*R*T

n = (p*V)/(R*T)

⇒with p = the initial pressure = 94.0 atm

⇒with V = the initial volume = 124.0 L

⇒with n = the initial number of moles = TO BE DETERMINED

⇒with R = the gas constant = 0.08206 L*atm/mol*K

⇒ with T = the temperature= 297 K

n = (94.0*124.0)/(0.08206*297)

n = 478.26 moles

Step 4: Calculate the difference of moles

529.14 moles - 478.26 moles = 50.88 moles

She lost 50.88 moles

4 0
3 years ago
If 4.80 mol Ca mixed with 2 mol N2, which is the limiting reactant? 3Ca (s) + N2 (g) Ca3N2 (s)
Andreyy89
Nitrogen in the limiting reactant x
4 0
2 years ago
Can we create matter? Why or why not?
Ivanshal [37]

Answer:

The first law of thermodynamics doesn't actually specify that matter can neither be created nor destroyed So yes we can create matter because matter is every where buildings ,structures etc. So the answer is yes!

Explanation:

 

                         Hope this helped!ヾ(•ω•`)o❤

6 0
2 years ago
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