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what mistake did carl make?

A) He did not multiply with calcium atoms by the subscript 2.
B) He did not add the coefficient 4 to the chlorine and oxygen atoms.
C) He did not add the subscript 2 to the calcium atoms.
D) He did not multiply the chlorine and oxygen atoms by the coefficient 4.

(pls answer question with letter choice as well as explaination)​

Answer:

Typically, the identity of a substance can be described by a: chemical name, for example, benzene; number, for example, EC number 200-753-7, and. chemical composition, for example, >99 % benzene and <1 % toluene.

Explanation:

Typically, the identity of a substance can be described as a: chemical name, for example, benzene chemical composition, for example, >99% benzene and <1% toluene. The composition is determined by chemical analysis.

I hope this helps.

Answer:

b

Explanation:

a drug problem consumes the bulk of a persons income because drugs are expensive to buy

A drug problem can quickly consume the bulk of a person income

A drug is any chemical substance that causes a change in an organism's physiology or psychology when consumed. Drug abuse or substance abuse refers to the use of certain chemicals for the purpose of creating pleasurable effects on the brain.

Drug use can have significant and damaging short-term and long-term effects. Taking some drugs can be particularly risky, especially if you take high doses or combine them with other drugs or alcohol.

People of any age, sex or economic status can become addicted to a drug. Certain factors can affect the likelihood and speed of developing an addiction.

The best way to prevent an addiction to a drug is not to take the drug at all. If your doctor prescribes a drug with the potential for addiction, use care when taking the drug and follow the instructions provided by your doctor. Thus you can save your income.

The correct answer is option B.

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Answer:

Goggles

Tie hair back

Explanation:

Can I have brainliest

Answer:

goggles and gloves

Explanation:

Answer:

The first ionization energy is defined as

Answer:

The answer to this is A. One kind of atom

Explanation:

The other options make no sense whatsoever. But enjoy.

I hope this helped.

Answer:

A. One kind of atom

Explanation:

Answer:

[tex]180^\circ[/tex] by the VSEPR theory.

Explanation:

This question is asking for the bond angle of the [tex]\rm C=C=O[/tex] bond in [tex]\rm H_2C=C=O[/tex]. The VSEPR (valence shell electron pair repulsion) theory could help. Start by considering: how many electron domains are there on the carbon atom between these two bond?

Note that "electron domains" refer to covalent bonds and lone pairs collectively.

For example, in [tex]\rm H_2C=C=O[/tex], the carbon atom at the center of that [tex]\rm C=C=O[/tex] bond has two electron domains:

In VSEPR theory, electron domains around an atom repel each other. As a result, they would spread out (in three dimensions) as far away from each other as possible. When there are only two electron domains around an atom, the two electron domains would form a straight line- with one domain on each side of the central atom. (To visualize, consider the three atoms in this [tex]\rm C=C=O[/tex] bond as three spheres on a stick. The central [tex]\rm C[/tex] atom would be between the other [tex]\rm C[/tex] atom and the [tex]\rm O[/tex] atom.)

This linear geometry corresponds to a bond angle of [tex]180^\circ[/tex].

Answer:

C

Explanation:

∆H°f means the enthalpy change of formation of one mole of substance by its constituent elements under standard conditions.

So in an equation for ∆H°f, we must see 2 or more elements as reactants combining to form a compound.

In the 4 answers, only C represents elements forming a substance (Al(s) + 3/2O2(g) + 3/2H2(g) -> Al(OH)3(s)),

while the others include compounds as one of their reactants.

The reaction Al(s) + 3/2O2(g) + 3/2H2(g) -> Al(OH)3(s) can be labeled as  standard enthalpy of formation  (∆Hf°).

In chemistry, the standard enthalpy of formation refers to the heat evolved or absorbed when a substance is formed from its constituent elements under standard conditions.

As such, we can see that the compound Al(OH)3(s) in option C was formed from its components; aluminium, oxygen and hydrogen therefore, the reaction Al(s) + 3/2O2(g) + 3/2H2(g) -> Al(OH)3(s) can be labeled as  standard enthalpy of formation  (∆Hf°).

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Answer:

B

Explanation:

Please take a look at the picture attached for the drawings and structures.

C2H4 is a alkene (C-C double bond). When steam (water) is added, it turns into an alcohol, where the double bond breaks and a (-OH) functional group is attached to one of the Carbons. In this case, C2H4 ethene is turned into ethanol.

When an alcohol undergoes oxidation, primary alcohols turn into aldehyde (-CHO) or carboxylic acids (-COOH). Secondary alcohol turns into ketone. Ethanol is a primary alcohol. And since it later reacts with propanol, it can only form carboxylic acid when it oxidizes. The product in this reaction is ethanoic acid.

Carboxylic acid reacts with alcohol to form an ester (-COO-). the -COOH group from acid combines with the -OH group from alcohol to form an ester bond -COO- while eliminating H2O. Therefore, when propanol undergoes esterification with ethanoic acid, propyl ethanoate is produced. It is the answer of B.

Answer:

Prokaryotic cells contain DNA, contain ribosomes, and lack a nucleus.

Answer:

Contains DNA

Contains Ribosomes

lacks a nucleus

Explanation: I took the quiz on edge

Answer: [tex]1.07\times 10^{23}[/tex] molecules

Explanation:

According to the ideal gas equation:

PV=nRT

P = Pressure of the gas = 1 atm ( at STP)

V= Volume of the gas  = 4.00 L

T= Temperature of the gas in kelvin = 273 K ( at STP)

R= Gas constant = 0.0821Latm/kmol

n=  moles of gas= ?

Putting in the values we get:

[tex]1atm\times 4.00L=n\times 0.0821Latm/Kmol\times 273K[/tex]

[tex]n=0.178mol[/tex]

Now 1 mole of any substance contains [tex]6.023\times 10^{23}[/tex] molecules at STP

Thus 0.178 mole of any substance contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.178=1.07\times 10^{23}[/tex] molecules at STP

Thus there are [tex]1.07\times 10^{23}[/tex] gaseous molecules in the flask.

Answer:

make reclamation compulsory after bauxite has been removed

Explanation:

Available options:

choose other infertile and uninhabited locations for bauxite mining

allow agriculture and mining to take place simultaneously in the location

ask farmers in the location to help in mining bauxite

make reclamation compulsory after bauxite has been removed

The correct option and the best plan to solve the problem of permanent dislocation of farmers would be to make reclamation compulsory after the bauxite has been removed.

Reclamation would involve restoring the agricultural land back to its original status prior to the commencement of bauxite mining. By doing this, the farmers can return to their farmland after being temporarily displaced due to the mining activities.

answer is b

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Answer:

Option B.

Kb = [CH3NH3+] [OH-] / [CH3NH2]

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

CH3NH2(aq) + H2O(l) <=> CH3NH3+(aq) + OH- (aq)?

The expression for the equilibrium constant, Kb is simply the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient.

Thus, the expression for the equilibrium constant, Kb fo th above reaction can be written as follow:

Kb = [CH3NH3+] [OH-] / [CH3NH2]

Option B gives the correct expression for Kb.

Answer:b

Explanation:AP EX

Answer:

A. It can travel through empty space

Explanation:

Unlike sound it light can travel at an empty space or vacuum.

Hope it helps <3 and Amen.

Answer:

the answer on plato / edmentum is A B and D

Explanation:

hope this helps <3

Answer:

A. Bromine

Explanation:

Bromine exists as a liquid at room temperature simply because there is more attractive force between its molecules than between those of fluorine or chlorine.

Answer:

If you know the number of protons and neutrons you have to simply subtract the number of neutrons by number of protons the answer will be number of neutron

Explanation:

Answer:

We can find the amount of electrons through its Atomic number and with the help of electronic configuration

The question's reaction is represented by the chemical equation NH3(g) + CH4(g) 3H2(g) + HCN (g).

Ammonia is created through an exothermic process. When the temperature rises, the reaction changes direction in order to cancel out the effect of the rise in temperature.

Fuel is oxidised in this reaction by combining with oxygen, which releases energy (often in the form of light and heat) as well as the creation of carbon dioxide and water (H 2 O). Consider this: Carbon dioxide is produced as a result of methane and oxygen reacting.

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Answer:

Fluorescent luminaire is the assembly that forms a lamp, called a fluorescent tube, and an armature, which contains the accessories necessary for operation. In certain places, only the lamp is known as a luminaire. The lamp is low pressure mercury vapor discharge and is normally used for domestic or industrial lighting. Its advantage over other types of lamps, such as incandescent lamps, is their energy efficiency.

The lamp consists of a thin glass tube lined internally with various compound chemicals called phosphors, although they generally do not contain the chemical element phosphorus and should not be confused with it. Those chemical compounds emit visible light when receiving ultraviolet radiation. The tube also contains a small amount of mercury vapor and an inert gas, usually argon or neon, at a pressure lower than atmospheric pressure. At each end of the tube is a filament ...

Explanation:

Answer:

89.4%

Explanation:

We'll begin by obtaining the actual yield of CO2. This can be obtained calculating the number of mole of CO2 produced from the reaction as follow:

Volume (V) = 1.44 L

Temperature (T) = 293 K

Pressure (P) = 0.984 atm

Gas constant (R) = 0.0821 atm.L/Kmol

Number of mole (n) =..?

PV = nRT

0.984 x 1.44 = n x 0.0821 x 293

Divide both side by 0.0821 x 293

n = (0.984 x 1.44) / (0.0821 x 293)

n = 0.059 mole

Therefore, the actual yield of CO2 is 0.059 mole.

Next we shall the theoretical yield of CO2. This can be obtained as follow:

First, we shall determine the number of mole in 5.97 g of glucose, C6H12O6.

Molar mass of C6H12O6 = (12x6) + (12x1) + (16x6) = 180 g/mol

Mass of C6H12O6 = 5.97 g

Mole of C6H12O6 =?

Mole = mass /molar mass

Mole of C6H12O6 = 5.97/180

Mole of C6H12O6 = 0.033 mole

Now, we can calculate the theoretical yield of CO2 as follow:

C6H12O6(s) → 2C2H5OH(l) + 2CO2(g)

From the balanced equation above,

1 mole of C6H12O6 produced 2 moles of CO2.

Therefore, 0.033 mole of C6H12O6 will produce = 0.033 x 2 = 0.066 mole of CO2.

Therefore, the theoretical yield of CO2 is 0.066 mole.

Finally, we shall determine the percentage of CO2 as follow:

Actual yield = 0.059 mole

Theoretical yield = 0.066 mole.

Percentage yield =?

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 0.059/0.066 x 100

Percentage yield = 89.4%

Therefore, the percentage yield of the reaction is 89.4%

Energy storage and transport. Chemical energy transport.

Answer:

to clean the water

Explanation:

Explanation:

Stoichiometry measures these quantitative relationships, and is used to determine the amount of products and reactants that are produced or needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry.

Answer:

B, 1.98g

Explanation:

No. of moles = mass / molar mass

no. of moles of Na2SO3 produced = 1.2 / 126.05 =0.009520031mol

From the balanced equation, the mole ratio of NaHSO3:Na2SO3 = 2:1, meaning every 2 moles of NaHSO3 reacted, gives out 1 mole of Na2SO3.

Since 0.009520031mol of Na2SO3 is produced, the no. of moles of NaHSO3 used = 0.009520031 x 2

= 0.019040063 mol

Mass = no. of moles x molar mass

Hence,

mass of NaHSO3 used = 0.019040063 x 104.07

= 1.98 g

= B

Answer:

it becomes poisonous to the body

Answer: Single replacement Reaction

Explanation:

A replacement reaction is a  chemical reaction in which an  element replaces another element  in a compound especially when it is more reactive than the former. There are two types of replacement reaction, the single and double replacement reaction.

In the former, one  element which  is usually more reactive than the other replaces it . For example in the single replacement, a more reactive metal replaces a less reactive metal and also a more reactive non metal can replace a less reactive non metal.

A + BC → B + AC

looking at the equation aove, you can see that B replaces A

Also In double replacement, the elements in the both reacting compounds are replaced or exchanged to form new compounds as can be illustrated in the equation

AB + CD —— AC + BD

In the case of Coach Kwan, she follows the Single  replacement model as she substitutes a less active and tired player with an active one.  

Answer:

This represents the single replacement model

A.)

Explanation:

The Coach replaced the tired player just like in a chemical reaction.

Answer : The net ionic equation will be,

[tex]H^{+}(aq)+OH^{-}(aq)\rightarrow H_2O(l)[/tex]

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The given balanced ionic equation will be,

[tex]HCl(aq)+NH_4OH(aq)\rightarrow NH_4Cl(aq)+H_2O(l)[/tex]

The ionic equation in separated aqueous solution will be,

[tex]H^+(aq)+Cl^-(aq)+NH_4^+(aq)+OH^-(aq)\rightarrow H_2O(l)+NH_4^+(aq)+Cl^-(aq)[/tex]

In this equation, [tex]NH_4^+\text{ and }Cl^-[/tex] are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

[tex]H^{+}(aq)+OH^{-}(aq)\rightarrow H_2O(l)[/tex]

Answer:

About 19.64 pounds of carbon dioxide are produced from burning a gallon of gasoline. On the other hand, 22.38 pounds of carbon dioxide are produced from burning a gallon of diesel. So, different fossil fuels will give different amounts of carbon dioxide to be released.

Explanation:

Tetraamminedichloridoiron(3) nitrate

Answer:

B

Explanation:

DuPont created the first acrylic fibers in 1941 and trademarked them under the name Orlon.

Answer:

Theoretical yield = 0.24 gram (Approx)

Explanation:

Given:

Butan-2-1

Molar mass(butan-2-ol) = 74.12 g/mol

Molar mass(butan-2-one) = 72.11 g/mol

Density of butan = 0.806 g/mol

Volume = 0.30 ml

Computation:

Mass of 2-butan = Density of butan × volume

Mass of 2-butan = 0.806 g/mol × 0.30 ml

Mass of 2-butan = 0.2418 g

Mass of product = Mass of 2-butan × [1 mol of butan-2-ol / 74.12] × [1 mol of butan-2-one / 1 mol of butan-2-ol] × [72.11 g/mol / 1 mol of butan-2-one]

Mass of product = 0.235 gram

Theoretical yield = 0.24 gram (Approx)

Answer:

Explanation:

Properties of metals:

1. They have a lustre ( shine )

2. They have a silvery-grey or golden-yellow colour.

3. They conduct heat and electricity.

4. They are ductile ( can be drawn into wires ) .

5.They are malleable ( can be hammered into thin sheets ).

6. They are sonorous ( make a ringing sound when hit ).

Properties of non-metals:

1. They display a variety of colours.

2. They are poor conductors of heat and electricity.

3. They are not lustrous, ductile or malleable.

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