State the number of sig figs in each value:


1) 0.00004050

2) 54.7000

3) 1,000.09

4) 0.039

ANSWER

EXPLANATION:

A single replacement reaction is also called a single displacement reaction.

A single replacement reaction is a type of reaction where one element is substituted for another element in a compound during a chemical reaction.

Below reaction is an example of a single replacement reaction

From the given options, you will see that the reaction between Zn and H2SO4 is a single replacement reaction

Zn will displace H2 because it is more reactive than hydrogen

Hence, the correct option is D

Answer: m-%(Ca) = 40.08 / 110.98

Explanation: molar mass of CaCl2 is 40.08+ 2·35.45 = 110.98

Think you have one mole substance. It contains 40.08 g Ca

I am not the best at this, but im pretty sure its below cloud

Answer:

it is not cloud it is soil

Explanation:

Answer:

E 1: cyclohexene

Explanation:

This reaction is an example of the dehydration of cyclic alcohols. The reaction proceeds in the following steps;

1) The first step of the process is the protonation of the cyclohexanol by the acid. This now yields H2O^+ attached to the cyclohexane ring.

2) the water molecule, which a good leaving group now leaves yielding a carbocation. This now leaves a cyclohexane carbocation which is highly reactive.

3) A water molecule now abstracts a proton from the carbon adjacent to the carbocation leading to the formation of cyclohexene and the regeneration of the acid catalyst. This is an E1 mechanism because it proceeds via a carbocation intermediate and not a concerted transition state, hence the answer.

The Orion constellation which can be seen all around the world is positioned upon its celestial equator and it is among the noticeable and distinctive constellations in the sky. It is thought to be a Greek Mythology named after a hunter.

The Orion Nebula forms from dust, hydrogen as well as other ionized gases.

The tale and myth of Orion have various variations and explanations but one of the most popular ones is that Orion declared himself as the topmost and strongest hunter in the world.

Therefore, we can conclude that the constellation Orion made using a telescope are Myth.

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Answer:

2.282 atm

P1V1/T1 = P2V2/T2

2.70atm / (50+273) = X/ 273

make x subject of formula

:. X = 2.28 atm

or 2.28 * 1.01 *10⁵ N/m²

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Answer: For example, uranium can fission to yield strontium and krypton. Fusion joins atomic nuclei together. The element formed has more neutrons or more protons than that of the starting material. For example, hydrogen and hydrogen can fuse to form helium.

Explanation:

Hope this helped!

Answer:

Explanation:For example, uranium can fission to yield strontium and krypton. Fusion joins atomic nuclei together. The element formed has more neutrons or more protons than that of the starting material. For example, hydrogen and hydrogen can fuse to form helium.

The number of moles of CO2 produced is 0.021 moles

If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.

The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).

The equation of the reaction is;

C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

We know that;

Number of moles of glucose = 10 g/180 g/mol

= 0.056 moles

PV = nRT

n = PV/RT

n = 1 * 0.55/318 * 0.082

n = 0.021

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Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.

In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.

Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.

Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.

Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).

The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.

Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.

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To solve this problem, I'll need some additional information related to the molar mass of butane (C4H10). Please provide the molar mass of butane so that I can proceed with the calculations.

To solve this we must be knowing each and every concept related to ore and bauxite. Therefore, Bauxite is best used for making wires. The correct option is option B.

Aluminum's primary source of supply is bauxite. Due to its small weight and ease of molding into fine wire or sheets, aluminum is particularly useful.

All across the world, bauxite may be found. The greatest deposits of this ore are in Australia and Guinea, an African nation. Although bauxite was initially found in France, it may now be found all over the world, such as the Caribbean.

Therefore, Bauxite is best used for making wires. The correct option is option B.

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Answer:

Gallium (Ga)

Explanation:

Gallium (Ga) is the element which is represented by the given electron configuration since the total number electron is 31.

A material that cannot be destroyed chemically is referred to as a chemical element. Although chemical processes cannot modify an atom, nuclear reactions can create new elements. The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count. Since there are 31 total electrons in the universe, gallium (Ga) gets the element that is denoted by the specified electron configuration.

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Answer:

Carbon 3 is double bonded to an oxygen and attached to carbon 2 and carbon 4. :

Answer: Carbonyl group ( Ketone or aldehyde)

Carbon 17 is attached to an oxygen, which is attached to a hydrogen. :

Answer: Carboxyl group (Carboxylic acid)

A central carbon is attached to an amine, two hydrogens, and a carbon that is double bonded to an oxygen and single bonded to an oxygen attached to a hydrogen. :

Answer: Amide group

An amide group contains both amine and carboxyl

\(.\)

The following properties change across the periodic Table from group 1 to group 2

Group 1 are alkali metals that have one valence electron in the outermost orbit whereas alkaline earth metals are in group 2 have two valence electrons in the outermost orbit.

a) Ionic radius:

b) Ionisation enthalpy:

c) Density:

d) Melting point:

e) Electropositive character:

Thus, changes in properties are:

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The chemical elements involved are; hydrogen, fluorine, boron and lithium

There are two hydrogen atoms, five fluorine atoms, one boron atom and one lithium atom.

Chemical compounds are represented symbolically by chemical formulas, which reveal the types and amounts of atoms that make up the compound. It is a succinct approach to explain a substance's makeup.

The components of a compound are identified in a chemical formula by their corresponding chemical symbols, which are typically derived from their English or Latin names. The number of atoms of each element in a single compound molecule is indicated by the subscripts that follow each element.

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Answer:The reactions are as follows: a carbon-12 (12C) nucleus captures a hydrogen nucleus (1H, a proton) to form a nucleus of nitrogen-13 (13N); a gamma ray (γ) is emitted in the process. The nitrogen-13 nucleus emits a positive electron (positron, e+) and becomes carbon-13 (13C).

Answer

1Ca(ClO₃)₂ → 1CaCl₂ + 3O₂

Explanation

Given chemical equation:

Ca(ClO₃)₂ → CaCl₂ + O₂

The Algebraic Method of balancing chemical equation is given by the formula below:

aA + bB → cC + dD

Where; a, b, c, and d are the coefficients of the reactants A and B, and products C and D respectively

Considering the given equation:

Put unknown coefficient in front of each species

bCa(ClO₃)₂ → cCaCl₂ + dO₂

For Ca; bCa = cCa ------(i)

For Cl; 2bCl = 2cCl ------(ii)

For O; 2 x 3 x bO = 6bO = 2dO ------(iii)

Let assign b = 1

Therefore, from (i); b = c ⇒ b = c = 1

From (ii); b = c = 1

From (iii); 6b = 2d

Substitute b = 1 into (iii)

6(1) = 2d

d = 6/2 = 3

The coefficients b = 1, c = 1, and d = 3

Hence, the balanced equation is

bCa(ClO₃)₂ → cCaCl₂ + dO₂

1Ca(ClO₃)₂ → 1CaCl₂ + 3O₂

To solve this problem, we need to use the concentration of the solution (25.0 ppm) and the amount of the solution (2000 g) to calculate the amount of lead present in the solution.

First, we need to convert the concentration from parts per million (ppm) to grams per gram (g/g). We can do this by dividing the ppm value by 1,000,000:

25.0 ppm = 25.0/1,000,000 g/g

Next, we can multiply the concentration (in g/g) by the amount of solution (in grams) to get the mass of lead present in the solution:

mass of lead = concentration x amount of solution

mass of lead = (25.0/1,000,000) x 2000

mass of lead = 0.050 g

Therefore, there are 0.050 grams of lead in 2000 grams of a 25.0 ppm solution of lead water waste.

Answer:

a liquid cooling

Explanation:

Liquid cooling results in liquid (more disorder) turning to solid (less disorder).

Entropy describe disorder in our system. Going from more disorder to less disorder decreases entropy.

Rest of the options increase entropy b/c gas escaping from tire releases gas from confined shape to vast environment, snow melting turns solid (order) into liquid (less order), and salt dissolving turns solid into liquid form.

Answer:

Why might the expression "1 mole of nitrogen" be confusing? ... WebAssign will check your answer for the correct number of significant ... Calculate the moles of O atoms in 8.18 g of Mg(NO3)2. ... If the molar mass of hemoglobin is 6.8 104 g/mol, how many Fe2+ ions are ... (_) C7H16(l) + 11 O2(g) 7 CO2(g) + 8 H2O(g)

Explanation:

Answer: Double replacement reaction

Explanation:

Answer: I think the answer is Cesium (Cs)

Explanation:

A half-filled 6s subshell would be 6s^1

Answer:

The correct answer is - 46.60 mL.

Explanation:

To find the volume of the gas at its new increased temperature we need to use Charl Law that shows the direct relationship between Volume and Temperature while Pressure remains constant.

V1 = 40 ml

T1  = 30 degree C + 273 = 303 K

V2  = ?

T2  = 80 degree C + 273 = 353 K

Charl Equation is:

V 1/T 1  =  V 2/ T 2

(V1) * (T2)/ T1= V2

placing value:

40*353/303 = V2

= 14120/303

Vf = 46.60 mL

The volume of the base NaOH in the reaction is determined as 28.5 mL.

The balanced equation for the reaction between NaOH and H₂SO₄ is given as;

2NaOH + H₂SO₄ ----> Na₂SO₄ + 2H₂O

From the balanced chemical equation, the number of moles of acid in the reaction is calculated as follows;

n = 0.012 L x 0.132

n = 0.00158

The equivalent number of moles of the base is calculated as follows;

n_b = 2 x 0.00158

n_b = 0.00316

The volume of the base in the reaction is calculated as follows;

V_b = 0.00316 moles / 0.111 M

V_b = 28.5 mL.

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Answer:

1. heptane

2. octane

3. hexane

4. pentane

5. nonane

6. butane

7. propane

8. decane

Explanation:

Hydrocarbons are named based on how many carbon atoms they have.

meth - 1

eth - 2

prop - 3

but - 4

pent - 5

hex - 6

hept - 7

oct - 8

non - 9

dec - 10

Hope that helps.

Answer:

Explanation:

A student obtains a clean, dry graduated cylinder. She weighs the cylinder and finds the mass to be 32.64 g. She then fills the cylinder with a certain volume of water. She weighs the water-filled cylinder and finds the total mass to be 61.57 g. If the density of the water in the laboratory is 0.9975 g / mL , what is the volume of the water in the graduated cylinder?

Answer:

Volume of water =29.00mL

Explanation:

mass of cylinder (Mc)=32.64g

mass of water-filled cylinder (Mw+c)=61.57g

mass of water (Mw)= (Mw+c) - (Mc).

=(61.57 - 32.64)g = 28.93g

However:

Density = mass÷volume

hence Volume of water = mass of water÷density of water.

28.93g÷0.9975g/mL = 29.00mL

STEP-BY-STEP EXPLANATION:

Firstly, we need to define primary, a secondary, and tertiary alcohol

Primary alcohol: A primary alcohol in which the hydroxyl group is bonded to a primary carbon atom. Examples of primary alcohol are ethanol and 1-butanol.

The structure of a primary alcohol is given below

Secondary alcohol: A secondary alcohol has the hydroxyl group on a secondary carbon atom, which is bonded to two other carbon atoms.

Examples of secondary alcohol are propan-2-ol, butan-2-ol, pen-3-ol

The structure of a secondary alcohol is given below

Tertiary alcohol: Tertiary alcohol is a compound in which a hydroxy group, -OH, is attached to a saturated carbon atom which has three other carbon atoms attached to it.

Examples of tertiary alcohol are 2-methylpropan-2-ol, 2-methylbutan-2-ol

The structure of tertiary alcohol is given below

According to the question given,

The first structure has a single alkyl group and the functional group(OH) is attached to the primary atom. Hence, Butan-ol is a primary alcohol.

The second structure has two alkyl groups and the function group is on the second carbon atom. Hence, it belongs to the secondary alcohol group.

The third structure belongs to tertiary alcohol

The number of atoms of any element in the given chemical formula is the number that is written on the foot of the symbol of that element. Therefore, chlorine has the strongest attraction for electrons in a chemical bond.

Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.

Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus.

Electronegative element have greatest strongest attraction for electrons due to high effective nuclear charge. Among the given molecules, chlorine is the most electronegative element. Chlorine has the strongest attraction for electrons in a chemical bond.

Therefore, chlorine has the strongest attraction for electrons in a chemical bond.

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Approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

The relationship between the initial and final concentrations and volumes must be taken into account.

Given: Initial concentration \((C^1) = 1 M Initial volume (V^1) = 250 mL\)

\((C^2) = 3 M final concentration\)

We can use the equation:

\(C^1 * V^1 = C^2 * V^2\)

Where:

\(V^2\)is the final volume of the solution

Rearranging the equation to solve for V2:

\(V^2 = (C^1 * V^1) / C^2\)

Substituting the given values:

\(V^2 = (1 M * 250 mL) / 3 M\)

\(V^2 = 250 mL / 3\)

\(V^2\) ≈ \(83.33 mL\)

To find the amount of water that needs to be evaporated, we subtract the final volume from the initial volume:

Amount of water to be evaporated = \(V^1 - V^2\)

Amount of water to be evaporated = 250 mL - 83.33 mL

Amount of water to be evaporated ≈ 166.67 mL

Therefore, approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

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The mass concentration of sand in the ethanol solution is 0.299 g/dm³.

To find the concentration in grams per cubic decimeter (g/dm³), we first need to convert the volume from liters to cubic decimeters (dm³). Since 1 liter is equal to 1 cubic decimeter, we can directly convert the volume.

Given:

Mass of sand = 0.2 g

Volume of ethanol = two-thirds liter

Converting volume to dm³:

1 liter = 1 cubic decimeter

two-thirds liter = (2/3) cubic decimeter = 0.67 dm³ (rounded to two decimal places)

Now we can calculate the concentration in g/dm³ by dividing the mass of sand by the volume in dm³:

Concentration = Mass / Volume

Concentration = 0.2 g / 0.67 dm³

Concentration ≈ 0.299 g/dm³ (rounded to three decimal places)

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