What errors did the chemistry teacher make in planning to this demonstration and how could checking her work have made a difference?

*THERE ARE A TOTAL OF 4 ERRORS* NEED HELP ASAP BEFORE 11:59 PM

With the hope of sharing an explosive combustion reaction demonstration in class
for her students, a chemistry teacher decides to synthesize water. This process
occurs when oxygen gas (O₂) in the air is combined with hydrogen gas, H₂, in the
presence of a spark or small flame. Like the reactants, the water (H₂O) product is
also a gas.
She knew she didn't want the demonstration to create too much water product,
only 180.0 grams.
Since the oxygen reactant is abundantly present in the air, she needed only to
determine how much hydrogen gas to prepare before class.
She used the following chemical equation to make her predictions:
O2(g) + H2(g) → H₂O(g)

Answer:

5095 JULLITET LI\

Explanation:

Answer:

0.5 M

Explanation:

molarity = (moles of solute)/(liters of solution)

molarity = 2.00/4 = 0.5 M

Answer:

The periodic table

Explanation:

As you can see in the screenshot. Each element on the periodic table has an atomic number and a mass number. The atomic numbers are arranged in numerical order from right to left in the periodic table. The second number there is the atomic mass.

When doing stoichiometric ratios, you need to use the atomic mass of each element to determine the molecular/molar mass.

example. Find the molar mass of

H₂SO₄

Hydrogen (2) + sulphur (1) +oxygen (4)

= atomic mass of H(2)+ atomic mass S(1)+ atomic mass oxygen(4)

=1(2) + 32(1)+16(4)

=2+32+64

=98

N.B We do not use the co-efficient when looking for molar mass, we only use the atom and subscript

Answer:

the answer to the qustion is 0.013089701 na

Explanation:

n/a

The volume of CO2 prodiced when 12 mL of CH4 and 8 mL of C4H10 is burnt is 56 mL.

The equation of the combustion of C2H6, CH4, C4H10, and C3H8 gases are given below:

2 C2H6 + 7 O2 ---> 4 CO2 + 6 H20

C3H8 + 5 O2 ---> 3 CO2 + 4 H20

CH4 + 2 O2 ----> CO2 + 2 H2O

2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O

X moles of C2H6 will produce 2X moles of CO2

Y moles of C3H8 will produce 3Y moles of CO2

Thus;

X + Y = 20 mL

X =20 - Y ---(1)

2X + 3Y = 52 mL ---(2)

Solving for X by substituting in (2)

2 (20 - Y) + 3Y = 52

40 - 2Y + 3Y = 52

Y = 12 mL

Then X = 8 mL

Volume of CO2 produced when 12 mL of CH4 and 8 mL of C4H10 is burnt = (12 × 2 + 8 × 4) = 56 mL

Therefore, the volume of CO2 produced is 56 mL.

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Answer:

Antacids are medicines that counteract (neutralise) the acid in your stomach to relieve indigestion and heartburn. They come as a liquid or chewable tablets and can be bought from pharmacies and shops without a prescription.

The minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.

The term excitation has to do with the promotion of an electron from a lower to a higher energy level.

In this case, we are dealing with the hydrogen atom having only one electron. Thus, the minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.

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The molecular formula CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

Organic compounds are compounds that are obtained from organic materials.

The most common organic compound are the hydrocarbons,

The hydrocarbons includes the alkanes, alkenes, alkynes, etc.

The given compound CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

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Answer: 339.84 K

Explanation:

[tex]$$We are given: \\$\mathrm{n}=0.46$ moles \\$V=13.3 \mathrm{~L}$\\$\mathrm{P}=734 \mathrm{~mm} \mathrm{Hg}=0.965 \mathrm{~atm}$\\Putting these values in ideal gas equation we get:\\$0.965$ batm * $13.3 \mathrm{~L}=0.46 \mathrm{~mol} * 0.0821 \frac{\mathrm{atmL}}{\mathrm{molK}} * \mathrm{~T}$\\$\mathrm{T}=\frac{0.965 * 13.3}{0.46 * 0.0821} \mathrm{~K}$$$\mathrm{T}=339.84 \mathrm{~K}$$[/tex]

Answer:

660J/kg.°C

Explanation:

Using the fact that

∆E of metal + ∆E of water = 0

∆E of the metal = Q = m*c*(T2-T1)

Where

Q = heat lost or gained = ?

m = mass of metal in kg = 0.076kg

c = specific heat of the metal = ?

T1 = 96°C

T2=31°C

∆E of the water=Q= m*c*(T2-T1)

Where

Q = 0.120*4180*6.5 = 3260J

Therefore

3,260J + Q of the metal =0

3,260J + 0.076*C*(31.0–96.0)=0

3,260J - 4.94c = 0

3,260 = 4.94c

3,260/4.94 = c

660J/kg.°C = specific heat of the metal

hope this helps:)

The valence electron of the light metals are all in the range of 1 to 3.

Valence Electron is the number of electrons in the outer shell of an atom which participate in bond formation.

Number of Valence Electron in Boron is 3 and other light metals lighter than Boron have 1 , 2 of Lithium and Beryllium respectively,

The valence electron of the light metals are all in the range of 1 to 3.

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Answer:

convert the 25.13 g of Fe2O3 into moles by dividing by its molar mass (159.69) to get that. When looking at the stoichiometric coefficients, we can see that for every 1 mole of Fe2O3, there needs to be 3 moles of CO.

Explanation:

The elaboration likelihood model emphasizes the use of direct persuasion and peripheral persuasion methods.

What is direct persuasion and peripheral persuasion?

This theory involves a dual process which explains how attitudes are changed in individuals through persuasion.

These methods help in the formation of attitude which makes, in this case,  option use of direct persuasion and peripheral persuasion.

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Answer:

C. direct . . . peripheral

Explanation:

Because I said so.

The new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

Endothermic reactions, in general, are those that absorb (or use) energy. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products.

Normally, when a chemical bond is broken, energy is released in the process. The chemical bond formation also demands an energy input.

The energy that is supplied/released can come in varieties (such as heat, light, and electricity). The formation of chemical bonds following the absorption of heat from the environment characterizes endothermic processes.

When two chemicals react in an endothermic reaction the new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.

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Answer:

D.

Explanation:

This is because this option would allow one to see the sorroundings of the new building. The others only give perpectives on what the new building looks like, isolated from its sorroundings.

Answer:

14

Explanation:

sun normal persentage is 14

The mass of  2.75 ×   [tex]10^{-4}[/tex]moles NaOH will be 1.1 x  [tex]10^{-2}[/tex] grams

Recall that:

Mole = mass/molar mass.

Thus, mass = mole x molar mass.

In this case, the mole is  2.75 × [tex]10^{-4}[/tex] moles and the molar mass of NaOH is 40 g/mol.

Mass =  2.75 ×  [tex]10^{-4}[/tex]x 40 = 1.1 x  [tex]10^{-2}[/tex] grams

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Answer:

Answer is option B or:

1.10 x 10–2 g NaOH

Explanation:

hope this helps! (edge)

Answer:

See below ~

Explanation:

The respective pairs are :

× Ribose ⇒ The sugar of RNA

× Double helix ⇒ Structures of DNA

× Watson & Crick ⇒ Proposed the double helix model

× Base pair ⇒ Adenine - Thymine pair

× Cytosine ⇒ The nucleotide pair of Guanine

Answer:

um Im not sure what the heck that is

Answer:

B

Explanation:

i just know

Answer:

B

Explanation:

Hydrocarbons are with hydrogen and carbon only, so therefore you can immediately eliminate C and D. Therefore, we are left with A and B. Unsaturated hydrocarbons have double bonds or more, so B would be our answer (Double bond between carbon 1 and 2)

answer:

is Well-Known Member. For a 35" you should be in the 28-32 range on road.

Explanation:

your welcome make brainlist

Answer:

Ionic compounds do not exist in independent molecular form

-Lexi

Answer:

A Dendrologist! They are the type of Scientist that studie trees.

A person who eats three servings of the cereal without milk will consume about 117 percent of calories.

This is defined as  a unit of energy and is commonly used in the body system.

One serving of cereal without milk will contain 39 percent of calories while three servings will be 117 percent.

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Answer:

Y E S

Explanation:

Hibiscus tea has plenty of skin care qualities, from helping your natural levels of collagen and elastin to reducing breakouts to balancing oil production. Hibiscus is known for its rich level of antioxidants, including vitamin C and beta-carotene.

I hope this helps ✍(◔◡◔)

Answer:Methane(CH4) and dioxygen(O2) are the reactants

Carbon dioxide(CO2) and water(H2O) are the products

Explanation:

Answer:

green n yellow and white and black and white sq

Answer:

C

Explanation:

just did it