What is the first step of the scientific method?

Which of the following specifies the correct reducing agent in the given redox reaction? View Available Hint(s) Which of the fol

padilas [110]

Answer: $NiO+CO\rightarrow Ni+CO_2$ : reducing agent is CO.

Explanation:

a) $Fe+Cu^{2+}\rightarrow Fe^{2+}+Cu$

The oxidation state of copper reduces from +2 to 0, it is getting reduced. As $Cu^{2+}$ gets reduced, it acts as an oxidising agent.

The oxidation state of iron increases from 0 to +2. Thus, it is getting oxidized. As $Fe$ gets oxidized, it acts as a reducing agent.

b. $2Na+Cl_2\rightarrow 2NaCl$

The oxidation state of chlorine reduces from 0 to -1, it is getting reduced. As $Cl_2$ gets reduced, it acts as an oxidising agent.

The oxidation state of sodium increases from 0 to +1. Thus, it is getting oxidized. As $Na$ gets oxidized, it acts as a reducing agent.

c. $C+O_2\rightarrow CO_2$

The oxidation state of oxygen reduces from 0 to -2, it is getting reduced. As $O_2$ gets reduced, it acts as an oxidising agent.

The oxidation state of carbon increases from 0 to +2. Thus, it is getting oxidized. As $C$ gets oxidized, it acts as a reducing agent.

d. $NiO+CO\rightarrow Ni+CO_2$

The oxidation state of nickel reduces from +2 to 0, it is getting reduced. As $Ni^{2+}$ gets reduced, it acts as an oxidising agent.

The oxidation state of carbon increases from +2 to +4. Thus, it is getting oxidized. As $CO$ gets oxidized, it acts as a reducing agent.

3 0

4 years ago

Convert 1.500 L to cm3. To the correct number of significant figures.

Tasya [4]

Answer:

1500 cubic centimeters or cm^3

Explanation:

1 liter is 1000 cm^3

move the decimal 3 places to right

8 0

2 years ago

A steel cylinder for scuba diving contains 11.1 L of compressed air. The pressure inside the cylinder is

Juli2301 [7.4K]

Answer:

9.28moles

Explanation:

Given parameters:

volume = 11.1L

pressure = 204atm

temperature = 24°C = 24 + 273 = 297K

Unknown:

Number of moles of air in the cylinder = ?

Solution:

To solve this problem, we apply the ideal gas equation;

PV = nRT

P is the pressure

V is the volume

n is the number of moles

R is the gas constant = 0.082atmdm³mol⁻¹K⁻¹

T is the temperature

Now insert the parameters and find n;

204 x 11.1 = n x 0.082 x 297

226.4 = 24.4n

n = 9.28moles

4 0

3 years ago

Balance the combustion reaction between propane and oxygen.<br> C ₃ H ₈+ O ₂→ CO ₂ + H ₂ O

lys-0071 [83]

Answer:

The answer is C3H8 + 5O2 → 3CO2 + 4H2O .

6 0

3 years ago

Read 2 more answers

If crystal growth does not start on its own after the solution in the flask returns to room temperature, identify the best ways

deff fn [24]

Answer: The best way to promote the process are:

--> Add a bit of solid as a seed crystal.

--> Scratch the bottom of the flask gently with a stirring rod.

Explanation:

A crystal growth is seen is SUPERSATURATED solutions which contains more solute than it can normally dissolve at that given temperature. It is usually very UNSTABLE and capable of releasing the excess solute if disturbed, either by shaking or seeding with a tiny crystals.

Crystallization can be used for the separation of two salts with different solubilities as well as for purification of a soluble salt that contains insoluble solid impurities. Recrystallization improves the validity of the process. Crystallization can be initiated by:

--> Scratching the bottom of the flask gently with a stirring rod: scratching initiates crystallization by providing energy from the high-frequency vibrations.

--> Adding a bit of solid as a seed crystal: Seed crystals create a nucleation site where crystals can begin growth.

7 0

3 years ago