Can you give me the answers to questions 28 and 29 please?

Answer:

70 moles is an Alluminium

2265 g Fe₃O₄

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced] Fe₃O₄ + 4H₂ → 3Fe + 4H₂O

[Given] 705.0 g H₂O

Step 2: Identify Conversions

[RxN] 4 mol H₂O → 1 mol Fe₃O₄

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Fe - 55.85 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Molar Mass of Fe₃O₄ - 3(55.85) + 4(16.00) = 231.55 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 4 sig figs.

2264.74 g Fe₃O₄ ≈ 2265 g Fe₃O₄

Answer: CONDENSATION When steam is cooled, it releases thermal energy and turns into its liquid state. This process is called condensation. reversed if the liquid is cooled. The change from the liquid state to the solid state is called freezing

Answer:

a. ½O2

b. O2

c. 3O2

d. 6O2

Explanation:

Hello!

In this case, since balancing chemical reactions can be attained by adding coefficients prior to each species in the chemical equation, we infer that the following representations are correct because they have a coefficient and the molecule O2 as diatomic oxygen:

a. ½O2

b. O2

c. 3O2

d. 6O2

It means that e. and f. are wrong because even when they have the coefficient, the molecule O2 is not properly written.

Best regards!

The correct representations of O2 and its coefficient are: ½O2, O2, 3O2, 6O2.

Oxygen molecule O2 exists as a diatomic molecule that comprises two atoms chemically bonded together.

When oxygen undergoes a chemical reaction with other compounds, the diatomicity of oxygen O2 is still usually maintained.

The coefficient of oxygen O2 varies depending on the reaction in which oxygen undergoes such as:

An oxygen molecule does not exist as 3O and 5O3 represent a reaction of ozone.

Therefore, we can conclude that the correct representations of O2 and its coefficient are: ½O2, O2, 3O2, 6O2.

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Answer: The Eurasian Plate or both the Eurasian and Pacific Plate.

Explanation:

Answer:

One way is through fossil fuels. When people burn fossil fuels it enters the atmosphere as carbon dioxide gas. Another way is through animals. Most animals exhale carbon dioxide as a waste product which gets into the atmosphere.

Answer:

Option 2, 3, and also 6 btw

Explanation:

The other guy was wrong

Answer:

Explanation

Boron (B)

Silicon (Si)

Germanium (Ge)

Arsenic (As)

Antimony (Sb)

Tellurium (Te)

Polonium (Po

Answer:C. They can be produced easily in areas with geothermal activity.

D. The land can be used for other purposes while supplying energy.

Explanation:

Both c and d are correct

It is easier to switch to solar and wind energy as compared to other alternative energy sources because they can be produced easily in areas with geothermal activity and can be used for other purposes while supplying energy.

Solar energy is any type of energy generated by the sun. Solar energy can be harnessed directly or indirectly for human use.

Generating energy that produces no greenhouse gas emissions from fossil fuels and reduces some types of air pollution.

Diversifying energy supply and reducing dependence on imported fuels. Creating economic development and jobs in manufacturing, installation, and more.

Hence, options C and D are correct.

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Answer: d. Glaciers moving revealing bare rock underneath

Explanation:

Primary succession is what happens when living things colonise an area that was previously uncolonized because it had been destroyed or hadn't been created yet.

When glaciers move on from areas and expose the bare rock underneath, these areas are new and so primary succession will take place as living things begin to colonize this new area.

Answer: Coefficient 0

subscript for V 2

subscript for O 5

Explanation: yes

There is no coefficient in V₂O₅ and the subscript of vanadium V is 2 and the subscript of oxygen is 5.

Vanadium pentoxide is an ionic compound formed by donating electrons from the vanadium metal to oxygen.  The chemical formula of vanadium pentoxide is V₂O₅.

The chemical formula of a compound is written in terms of the chemical symbol of each constituent elements and the number of their atoms. The number of atoms is written as subscript for the chemical symbols.

In V₂O₅, there are are 2 vanadium atoms and 5 oxygen atoms. Coefficients are numbers prior to the formula in reaction. Here there is no coefficient and the subscript for V is 2 and that of O is 5.

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Answer:

V = 172.28 mL

Explanation:

density is mass divided by volume

p = density

m = mass

V = volume

p = m/v

V = m/p

V = 392.8/2.28

V = 172.28 mL

H2O as an oxidant only

Given

Reaction

2 Na + 2 H2O → 2 NaOH + H2

Required

The function of water in the equation

Solution

Water : oxidizing agent

Na : reducing agent

Na⁰ → Na⁺ (oxidation)

H⁺- → H⁰ (reduction)

Acids and bases according to Bronsted-Lowry

Acid = donor (donor) proton (H⁺ ion)

Base = proton (receiver) acceptor (H⁺ ion)

If water is acting as an acid it should only give 1 H +, so that becomes:

H₂O (l) ⇔ OH⁻ (aq) not H₂

Answer:

mechanical energy

Explanation:

Answer:

Something or someone you can see invisibility is the opposite of something you cannot see or some thing you cannot see

Explanation:

Answer:

B. One or more phase change occur

C. the final state of substance is liquid

D. the sample initially gas

Explanation:

The pressure p = 1.00 atm

The temperature t = 149.2K

The temperature > 119.8K

119.8K being the normal boiling point.

This shows that the krypton is a gas

After it has cooled the pressure = 1.00 atm

The temperature T dropped to 107.8K

T < 115.9K

The melting point has been put as 115.9K

This is a liquid. The final state of the substance is a liquid. Since the temperature is less than the melting point and the pressure is 1.00 atm

Answer:

New kinds of products forms and the reaction is not easily reversible.

Explanation:

The only way to be certain that a chemical change has occurred is by finding out if new kinds of products have been formed.

A chemical change is a change in which new kinds of matter is formed. It is always accompanied by energy changes.

The process is not easily reversible.

Examples of chemical changes are combustion, rusting of iron, precipitation and souring of milk.

Answer:

How fast the magnet in the generator is moving through the coiled wire

Explanation:

Another name for an electric generator is the electric motor. It is a device that is used to convert mechanical energy into electrical energy.

It comprises of a rectangular coil of insulated wire called armature which rotates about a fixed axis. Powerful magnets provides the required  magnetic field. A commutator made of split ring copper and two carbon brushes are attached to it.

The voltage produced by the electric motor depends on;

i) The strength of the magnetic field.

ii) The number of turns of the coil

iii) The current across the armature

Answer:

2HgO <---- 2Hg + O2

Explanation:

Explanation:

We have 2CO + O2 => 2CO2.

Moles of CO = 28.6g / (28g/mol) = 1.021mol.

Moles of CO2 = Moles of CO = 1.021mol.

Answer:

the effluent concentration of the CMFR is 150 mg/L

Explanation:

Given that;

flowrate of first water Q₁ = 1 m³/min

benzene concentration C₁ = 150 mg/L

flowrate of second water Q₂ = 0.5 m3/min

benzene concentration C₂ =  150 mg/L

To Calculate the effluent concentration of the CMFR, we use the expression;

[tex]C_{effluent}[/tex] = (Q₁C₁ + Q₂C₂) / Q₁ + Q₂

we substitute

[tex]C_{effluent}[/tex] = (1 × 150 + 0.5 × 150) / 1 + 0.5

[tex]C_{effluent}[/tex] = 225 / 1.5

[tex]C_{effluent}[/tex] = 150 mg/L

Therefore, the effluent concentration of the CMFR is 150 mg/L

Answer:

Mass =  799971.50 g

Explanation:

Given data:

Mass of ethene = 560 Kg (560 Kg ×1000 g/1 Kg= 560000 g)

Mass of ethanol produced = ?

Solution:

Chemical equation:

C₂H₄ + H₂O      →     C₂H₅OH

Number of moles of ethene:

Number of moles = mass/molar mass

Number of moles = 560000 g / 28.05 g/mol

Number of moles = 19964.35 mol

Now we will compare the moles of ethene and ethanol.

            C₂H₄        :         C₂H₅OH

               1            :            1

       19964.35      :         19964.35

Mass of ethanol:

Mass = number of moles × molar mass

Mass =  19964.35 mol × 46.07 g/mol

Mass =  799971.50 g

Answer: The SI unit of force is the newton, symbol N.

Explanation:

Answer:

the SI unit of force is newton

Answer:

CsNO₃

Explanation:

The reactants are:

         Cesium chloride  = CsCl

          Silver nitrate  = AgNO₃

Products:

           Silver chloride  = AgCl

The other product:

 Now;

        CsCl  +    AgNO₃  →  AgCl  + ?

The other product is CsNO₃

So;

      CsCl  +    AgNO₃  →  AgCl  +    CsNO₃

Answer:

2K   +   2H₂O   →   2KOH  + H₂

Explanation:

The reactants are:

    Potassium metal  = K

    Water  = H₂O

 The products are:

  Potassium hydroxide  = KOH

  Hydrogen gas  = H₂  

The reaction equation is given as;  

                Reactants   →   Products

        2K   +   2H₂O   →   2KOH  + H₂

The reaction is a single displacement reaction

Answer:

8.50095 x 10^5

Explanation:The purpose of scientific notation is for scientists to write very large, or very small, numbers with ease.

Calculating scientific notation for a positive integer is simple, as it always follows this notation:

a x 10b

Follow the steps below to see how 850,095 is written in scientific notation.

Step 1

To find a, take the number and move a decimal place to the right one position.

Original Number: 850,095

New Number: 8.50095

Step 2

Now, to find b, count how many places to the right of the decimal.

New Number: 8 . 5 0 0 9 5

Decimal Count:   1 2 3 4 5

There are 5 places to the right of the decimal place.

Step 3

Building upon what we know above, we can now reconstruct the number into scientific notation.

Remember, the notation is: a x 10b

a = 8.50095

b = 5

Now the whole thing:

8.50095 x 105

Step 4

Check your work:

105 = 100,000 x 8.50095 = 850,095

Answer:

c thats just what i do

Explanation: