3. IDENTIFY the following reactions as Oxidation / Reduction reactions ?
a) PbO + H2 --> Pb + H2O
b) ZnO + C --> Zn + CO
c) H2S + Cl2--> 2HCl + S
d) Fe203 + 3C0 --> 2Fe + 3CO2
e) PbS + 4H202 --- PbSO4 + 4H2O​

Answers

Answer 1
a) Is reduction AND oxidation
[ Reduction: since there is a loss of oxygen in Pb]
[Oxidation: since there is a gain of oxygen in H2O]

b) Reduction AND oxidation
[Reduction: since there is a loss of oxygen in Zn]
[Oxidation: since there is gain of oxygen in CO]

c) Oxidisation AND reduction
[Oxidisation: since there is a loss of electrons in S]
[Reduction: since there is a gain of electrons in Cl^-1]

d)Reduction AND oxidation
[Reduction: since there is a loss of oxygen in 2Fe]
[Oxidation: since there is a gain of oxygen in 3CO2]

e) Oxidation AND Reduction
[Oxidation: since there is a gain of oxygen in PbSO4]
[Reduction: since there is a loss of oxygen in 4H2O]

( Hope this was helpful... And I apologize if any of the answers are incorrect.... I just did this chapter as well!)

Remember: Oxidation requires—Gain of O2
—Loss of H2
—Loss of elections

Reduction requires—loss of O2
—Gain of H2
—gain of electrons


Related Questions

3.) All matter has both physical and chemical properties. A physical property is one that does not change the chemical nature of matter. Which of these choices is a physical property?
A.) height
B.) flammability
C.) ability to rust
D.) reaction with water

Answers

Answer:

D

Explanation:

It would be D because you are observing the reaction and don’t change anything

Air is trapped in a cylinder fitted with a piston that occupies 150.5 mL at 1.12 atm pressure. What is the new volume when the piston is depressed, increasing the pressure by 15%?

Answers

Answer:

New volume V2 = 120.4 ml

Explanation:

Given:

Pressure P1 = 1.12 atm

New pressure P2 = 1.12[1+0.25] = 1.4 atm

Old volume V1 = 150.5 ml

Find:

New volume V2

Computation:

P1V1 = P2V2

(1.12)(150.5) = (1.4)(V2)

V2 = 120.4 ml

New volume V2 = 120.4 ml

If a substance has a PH of 7 is it a acid, base or a neutral.

Answers

Answer:

Neutral

Explanation:

A pH below 7 is acidic and a pH above 7 is basic, and a pH of 7 is neutral.

Answer:neutral
Explanation: A substance that is neither acidic nor basic is neutral. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral

Help plz:))) I’ll mark u brainliest
ASAP!!!

Answers

Answer:

rank from lower to higher electronegativity

16)Li

   C

   N

17)Ne

  C

   O

18)Si

   P

   O

19)K

   Mg

   P

20)He

    S

    F

Heyyyyyyyy I’m smart I think I’m sorry

(Need Help ASAP) 23.5 grams of iron(III) oxide (Fe2O3) are reacted with excess carbon. What is the theoretical yield of iron metal?

2 Fe2O3 + 3 C --> 4 Fe + 3 CO2

Answers

The theoretical yield of iron metal : 16.418 g

Further explanation

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

Reaction

2 Fe₂O₃ + 3 C ⇒ 4 Fe + 3 CO₂

mol Fe₂O₃ (MW=159,69 g/mol) :

[tex]\tt \dfrac{23.5}{159.69}=0.147[/tex]

mol  Fe₂O₃ : mol Fe = 2 : 4

mol Fe :

[tex]\tt \dfrac{4}{2}\times 0.147=0.294[/tex]

mass Fe(the theoretical yield) :

[tex]\tt 0.294\times 55.845~g/mol=16.418~g[/tex]

Answer:

The correct answer with signfigs is 16.4 for the first part

The second box is 88.4

Explanation:

What igneous rock is non-vesicular and glassy in texture and has a mafic composition?

Answers

Answer:

igneous rock

Explanation:

How is the pH of an acidic substance raised?

1) Dilute it.
2) freeze it.
3) Stir it.
4) Concentrate it.

Answers

Answer: 4) Concentrate it

Explanation:

How do I graph these question
a. Explain why bicycle tires seem higher in the summer than in winter.

b. Explain why a can of soda pop explodes if left in the hot sun.

c. A rigid container filled with a gas is placed in ice (ex. nalgene bottle). What will happen to the pressure of the gas? What do you think will happen to the volume?

d. An infected tooth forms an abscess* that fills with gas. The abscess puts pressure on the nerve of the tooth, causing a toothache. While waiting to see a dentist, the person with the toothache tried to relieve the pain by treating the infected area with moist heat. Will this treatment help? Why or why not?

Answers

Number 1: I think it’s because the air inside of them expands with heat, so you could graph the expansion rate for all of them really

A very hot cube of copper metal (32.5 g) is submerged into 105.3 g of water at 15.4 0C and it reach a thermal equilibrium of 17.3 0 Calculate the initial temperature of copper (Cs = 0.385 J/g 0C for copper, and 4.18 J/g 0C for water).

Answers

Answer:

The initial temperature of the metal is 84.149 °C.

Explanation:

The heat lost by the metal will be equivalent to the heat gain by the water.  

- (msΔT)metal = (msΔT)water

-32.5 grams × 0.365 J/g°C × ΔT = 105.3 grams × 4.18 J/g °C × (17.3 -15.4)°C

-ΔT = 836.29/12.51 °C

-ΔT = 66.89 °C

-(T final - T initial) = 66.89 °C

T initial = 66.89 °C + T final

T initial = 66.89 °C + 17.3 °C

T initial = 84.149 °C.

Which is more electrically negative? 1)C 2)P or 3)S
GUYS PLEASE HELP!!! :((

Answers

Answer:

3 sulphur is more electrically –

Chemistry, please help

Answers

Answer:

Name ; Nickel(ii)Hydroxide

Formula;NI3O6

               

Explanation:

someone help me please i’ll give brainly

Answers

Answer:

D) All of the above

Explanation:

When the temperature of an object increases, the average kinetic energy and speed of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object also increases as its temperature increases.

periodic table of elements

Answers

Vertical Column is a group

Horizontal is Period

Aliki earth metals is a group

Lithium- Neon is both

Based on electrons are both

Number of electron shells is both

A 23.7 g piece of iron at 54.9°C is cooled and releases 338 J of heat. The specific heat of iron is 0.450 J/g°C.

Answers

Answer:

The heat capacity and the specific heat are related by C=cm or c=C/m. The mass m, specific heat c, change in temperature ΔT, and heat added (or subtracted) Q are related by the equation: Q=mcΔT. Values of specific heat are dependent on the properties and phase of a given substance.

Explanation:

Answer:

23.2 degrees c

Explanation:

With over 6 billion people living on Earth, it is common for two people to have the same DNA.
True
ОR
False

Answers

This answer would be false

what kind of bonds involve a transfer of electrons? what kind of bond involves sharing of electrons?

Answers

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Answer:

While covalent bonding involves sharing electrons between two atoms, ionic bonding involves the complete transfer of electrons from one atom to another, creating positive and negative ions. These ions are then held together by the attraction between their opposite charges.

Explanation:

Hope this helped!

This is due tomorrow so please help! : name a product where viscosity is important its creation or use explain why it is important

Answers

Like the other user stated, viscosity is an important property of fluid foods.it is defined and an internal friction of a liquid or it’s ability to resist flow

Can someone help? Ill give brainliest!

Directions: count each side of the reaction. Circle yes or no if it follows the law of conservation of mass

Answers

Answer:

Yes, it becomes 2 of H20 which is water

Which chemical equation is balanced?
A. CaO2 + HCl → CaCl2 + H20
B. CO2 + H2O + H2CO2
C. K+ H2O → K20 + H2
D. MgO + 2HCI – MgCl2 + H20
10 points if you answer fast

Answers

D. MgO + 2HCI – MgCl2 + H20

Further explanation

The chemical equation is said to be balanced if the number of atoms in the reactants is equal to the number of atoms in the product

A. CaO2 + HCl → CaCl2 + H20

atoms O, Cl and H are not the same

B. CO2 + H2O + H2CO2

atoms O are not the same

C. K+ H2O → K20 + H2

atoms K are not the same

D. MgO + 2HCI – MgCl2 + H20

Mg, left = 1, right=1

O, left=1, right=1

H, left=2, right=2

Cl, left=2, right=2

Chemical equation is balanced

Answer:

B. CO2 + H2O + H2CO2

Explanation:


If you have 100 particles of hydrogen and 100 particles of oxygen, how many units of water can you form? Will you use all the particles of both
elements? If not, what will remain?

Answers

Answer:

82

Explanation:

i took the assingment

How can air quality be fine on one day and hazardous on the next? What
are some things that can cause a rapid change in air quality? *

Answers

Answer:

Air Current

Explanation:

Say I am in California and there is a massive fire next to me but not close enough to me to really see the fire and the next day I see no fire but theres a ton of ash in the sky, this can be due to the wind current taking the smoke from the fire into my direction and that smoke falling in my area. So basically a wind current can take the smoke from a fire into another destination and cause a rapid change in air quality in a day.

A bus travels a distance 150km
in 5 hours where as another bus travel 200km in
6 hours which bus travel fast

Answers

Answer: The bus traveling 200km in 6 hours is traveling the fastest.

Explanation:

Bus 1

150km/5hrs

Simplify -> 30km/hr

Bus 2

200km/6hrs

Simplify -> About 33.333km/hr

{QUICK! HELP!} What is the chemical reaction when you add zinc to copper sulfate?

Answers

Answer:

the zinc strip begins to darken. If left in the solution for a longer period of time, the zinc will gradually decay due to oxidation to zinc ions.

Explanation:

6. All changes in states of matter (freezing, evaporation, condensation, etc.) are
a. physical changes
b. chemical changes

Answers

Pretty sure its Physical Changes

No chemical reaction is happening.

Answer:

Changes of states are physical changes

Explanation:

They are reversible changes that do not involve changes in matter's chemical makeup or chemical properties.

PLEASE MARK BRAINLIEST

Right Now Please <_> I really need it to level up

How did the substance oxygen change the world??

Answers

Answer: The atmosphere of Earth wasn't always full of oxygen. ... An accidental mutation would some day change the world forever as these organisms would become able to feed off of the sunlight around them, and produce oxygen in a process known as photosynthesis. This oxygen, which none of these organisms could use, was toxic.

The chemical equation below shows the amount of the reactants used and the amount of only one of the products formed. How much water (H2O) should be formed in this chemical reaction? CH4 mass 4 + 2O2 mass 16 CO2 11 + 2h2O mass ?

Answers

Answer:

CH4 + 2O2 → CO2 + 2H2O

Explanation:

This is all i could come up with im sorry.

The amount of water formed in the given chemical reaction is 9 grams.

What is Stoichiometry?

Stoichiometry is the calculation for the determination of the relative amount of reactants and products in chemical reactions. Stoichiometry is based on the law of conservation of mass where the total mass of the reactants in reaction equals the total mass of the products.

If the quantity of one reactant is known and the quantity of the product can be determined empirically, then the quantity of the other reactants can be calculated.

Given chemical equation is:

CH₄  +   2O₂  [tex]\longrightarrow[/tex]   CO₂   +   2H₂O

16g        32g         44g           32g        (from their molecular masses)

The amount of methane, oxygen, and carbon dioxide is 4g, 16g, and 32 g respectively.

16g of methane react with oxygen = 32g

4g of  methane will react with oxygen = 8g

It means here methane is the limiting reagent as the given amount of oxygen is more than reacted one.  So CH₄ will decide the amount of water.

16g of methane produces water = 32g

Then 4g of methane will produce water = (32/16) × 4 = 9 g

Therefore, 9 grams of water should be formed in this reaction.

Learn more about Stoichiometry, here:

https://brainly.com/question/11879608

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How is energy causing motion or creating a change in this image? (2 points)



Energy from fuel allows the plant to grow and make its own food.
Energy from the sun allows the plant to grow and make its own food.
Energy from the wind allows the plant to grow and make its own food.
Energy from the water allows the plant to grow and make its own food.

Answers

Answer:

Energy from the sun allows the plant to grow and make its own food.

Explanation:

From this image, we clearly see the leaves exposed to sun which supplies solar energy to the plant.

Plants are capable of producing their food from inorganic chemical sources. In the process of photosynthesis, plants takes carbon dioxide and water  in the presence of sunlight to manufacture their own food. The food provides energy that allows the plant to grow.

Answer:

Energy from the sun allows the plant to grow and make its own food

Explanation:

SOMEONE HELP ME PLEASE ILL GIVE BRAINLY

Answers

I believe that you should select all of them

it!
t
Calculate How old was the tree when it was
cut down?

Answers

Answer:

No numbers how are we supposed to know

Explanation:

Describe in your own words how the earth's layers were formed.

Answers

Answer:It starts from the centre.The inner core.The outer core.The mantle .And the crust.They formed as the building blocks of earth.Knownas planetesimals collided and collapsed under Thier own gravity around 4.5 billion years ago

The layers of the earth were formed due to the sediments that significantly flattens out beside the center of the earth. After a long duration, a new layer is spread over the older layer, and so on.

What are the different layers of the earth?

The different layers of the earth are as follows:

The Inner Core: This is the first layer from the center of the earth. The Outer Core: It is found after the inner core. The Mantle: It is the middle layer of the earth. The Crust: It is the outermost layer of the earth.

The above-mentioned layers of the earth were formed with the impact of the building blocks of the earth that are remarkably known as Planetesimals, collided, and collapsed.

During that time, the hardest elements like nickel, iron, etc. constitute the core while the lighter elements like carbon, oxygen, silicon, etc. play an essential role in the formation of crust and mantle.

Therefore, the layers of the earth were formed due to the sediments that significantly flattens out beside the center of the earth.

To learn more about The layers of the earth, refer to the link:

https://brainly.com/question/10430823

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