Question 10 of 25
Consider this reaction:
Mg(s) + 2H2O(1) ► Mg(OH)2(s) + H2(g)
What is the oxidation state of Mg in Mg(OH)2(s)?
A. +2
B. - 2
C. +1
D. 0

To determine the mass of CO₂, the following must be known :

Reaction

Decomposition of CaCO₃

CaCO₃ ⇒ CaO + CO₂

Given the mass of  CaCO₃, so to determine the mass of CO₂ :

1. Find the mol of  CaCO₃ from the molar mass of  CaCO₃

[tex]\tt n_{CaCO_3}=\dfrac{mass~CaCO_3}{MW~CaCO_3}[/tex]

2. Find the mole ratio of  CaCO₃ : CO₂(from equation = 1 : 1)

[tex]\tt n_{CaCO_3}\div n_{CO_2}=1\div 1[/tex]

3. Find the mass of CO₂ from the molar mass of CO₂

[tex]\tt mass_{CO_2}=n_{CO_2}\times MW_{CO_2}[/tex]

Answer:

1 3 and 5

Explanation:

Answer:

An organic compound (such as acetylene or butane) containing only carbon and hydrogen and often occurring in petroleum, natural gas, coal, and bitumens.

Explanation:

Iooked it up

We prepare the volume of the 8.61 M stock solution of 0.102 L, then we dilute it by adding water to 0.5 L

Given

5.00 × 10² mL of a 1.75 M H₂SO₄ solution

8.61 M stock solution

Required

The volume of stock solution

Solution

Molarity from 8.61 M to 1.75 M ⇒Dilution

We can use dilution formula :

[tex]\tt \boxed{\bold{M_1.V_1=M_2.V_2}}[/tex]

M₁=8.61 M

V₂=500 ml = 0.5 L

M₂=1.75 M

[tex]\tt V_1=\dfrac{M_2.V_2}{M_1}\\\\V_1=\dfrac{1.75\times 0.5}{8.61}\\\\V_1=0.102~L[/tex]

Answer:

24. B

25. B

26. B

Explanation:

24. As depicted in the image attached, all living organisms including animals undergo cellular respiration, which is the process whereby sugar molecule is broken down to release energy (ATP). In this process, CARBON DIOXIDE (CO2) is released as a product. The equation is as follows:

C6H12O6 + 6O2 → 6CO2 + 6H2O + energy

On the other hand, plants undergo a unique process called photosynthesis in order to synthesize their food (sugars) and hereby release oxygen gas in the process. Based on the diagram in option B, plants release oxygen using CO2, while animals release CO2 using O2.

25. The structure depicted in the image of this question is an organelle called MITOCHONDRIA. The mitochondrion is the site of cellular respiration (Krebs cycle and ETC) in eukaryotic cells.

26. Photosynthesis is a metabolic process unique to the cells of autotrophic organisms like green plants. It is the process where they synthesize their food in form of organic molecules using SUNLIGHT as a source of energy.

6CO2 + 6H2O + sunlight → C6H12O6 + 6O2

Answer:

Unit of power is watt

Explanation:

Power = rate of doing work

or

Power, P = W/t

Where

W is work done and t is time

The unit of work done is Joules and that of time is seconds.

Power, P = J/s

We know that, J/s = watts

Hence, the unit of power is watts.

Answer:For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion. For example, KCl, an ionic compound that contains K+ and Cl- ions, is named potassium chloride.

Explanation:

Answer:

the answer is

2,1,1,1

Explanation:

Answer:

its (D) Balance the half reactions based on the number of electrons.

Explanation:

Answer:

D ✔️

Explanation:

"Balance the half reactions based on the number of electrons."

Answer:

C. increase crop yields

Explanation:

Genetically modified organisms are those organisms that have been improved using genetic engineering procedures. Genetic engineering/modification is the manipulation of an organism's genome in order to get an improved organism with desirable traits.

The organisms being genetically modified or engineered is called GMO or transgenic organisms. Hence, in this case, one feature of the crops being genetically modified is to have an INCREASED YIELD.

Answer:

%Sgr = 1% (1 sig.fig.)

Explanation:

mass water = 350ml x 0.975g/ml = 341.25g

mass sugar added = 4g

solution mass = 341.25g + 4g = 345.25g

%sugar = (4g/345.25g)·100% = 1.1586% ≅ 1% (1 sig.fig)

The percent composition by the mass of the sugar solution is:

e. 1.16 %

This can be calculated by using mass of sugar.

Mass of water = 350ml x 0.975g/ml = 341.25g

Mass of sugar added = 4g

Total solution's mass = 341.25g + 4g = 345.25g

%sugar = (4g/345.25g)·100%

%sugar= 1.1586% ≅ 1.16 %

Thus, the percent composition of sugar is 1.16%. Hence, option E is correct.

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Answer:

The correct answer is HBr<NH4Br<KBr<NaCH3CO2<NaOH.

Explanation:

When salt is added to the water, the formation of acid and base takes place. The pH helps in predicting the basicity, acidity, and neutrality of a compound.

It is known that NaOH is a strong base, thus, its solution will be basic, and therefore, the pH of NaOH will be greater than 7.

The solution of HBr will be acidic as HBr is the strong acid, thus, its pH will be less than 7.

In dissolving NaCH3CO2 in water, the formation of CH3COOH, which is a weak acid, and NaOH that is, a strong base takes place. Therefore, as NaOH is the strong base, the solution will be basic, and the pH of NaCH3CO2 will be greater than 7.

On dissolving KBr in water, HBr, that is, a strong acid, and KOH, that is, a strong base is produced. Therefore, as HBr is the strong acid, and KOH is the strong base, the solution will be neutral. Thus, the pH of KBr will be equivalent to 7.

On dissolving NH4Br in water, the formation of HBr, that is, strong acid, and NH4OH, that is, the weak base takes place. Therefore, as HBr is the strong acid, the solution will be acidic, and the pH of NH4Br will be less than 7.

Hence, the increasing order of pH of 0.10 M aqueous solution will be,

HBr<NH4Br<KBr<NaCH3CO2<NaOH

The order of increasing pH of the solutions is; HBr < NH4Br < KBr < NaCH3CO2 < NaOH.

pH is a number that indicates the degree of acidity or alkalinity of a substance. The pH scale ranks from 0 - 14. 0 - 6.9 indicates acidity, 7 indicates neutrality while 8 - 14 indicates alkalinity.

The order of increasing pH of the solutions is; HBr < NH4Br < KBr < NaCH3CO2 < NaOH. Recall that NH4Br yields an acidic solution while NaCH3CO2 yields a basic solution.

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Answer:

This is the tendency for particles in suspension to settle out of fluid in which they are contained and come to rest against a barrier.

Explanation:

In sedimentation, the particles are in a fluid and under the influence of forces , for example, gravitational forces, they settle and then come to rest when faced with a barrier.

The settling process is the process in which the particles fall out of liquid and sedimentation is the end of the process.

The element will lose electrons to become stable if the valence shell contains 3 or fewer electrons. The production of cations is a sign of electron loss. The species having positive charge are called cations. As a result, the ion will get a positive charge.

An atom or molecule with a net electrical charge is known as an ion. Conventionally, the charge of an electron is thought to be negative; this charge is equal to and opposite to the charge of a proton, which is thought to be positive.

An atom will shed its valence electrons in order to become a charged ion and create an ionic bond with another atom if it lacks one to three of them.

A positive ion is created by taking electrons from a neutral atom, whereas a negative ion is created by adding electrons to a neutral atom. The quantity of protons remains constant during the formation of an ion.

Thus, the ion will get a positive charge.

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Answer:

group. hfdzybidddiklllnjjooolll

Answer:

An organ system

Explanation:

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Answer:

General formula of alkanes is: [tex]C_{n}H_{2n+2}[/tex]

General formula of alkyl: [tex]C_{n}H_{2n+1}[/tex]

Answer:

1.3×10²³ formula unit

Explanation:

Given data:

Mass of CaCl₂ = 23.8 g

Number of formula unit = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 23.8 g/110.98 g/mol

Number of moles = 0.21 mol

1 mole of any substance contain 6.022×10²³ formula unit

0.21 mol × 6.022×10²³ formula unit / 1mol

1.3×10²³ formula unit

Answer:

25% or 0.25 or 1/4

Explanation:

don't know which form you need so here you have all 3

good luck :)

Answer:

B

Explanation:

An electroplating happen when metal ions form a solid layer on a metal cathode. Therefore, option B is correct.

The term electroplating is defined as the process of aligning another metal on the metal. Electroplating is usually used to change the physical properties of an object.

An electroplating is accomplished by an electroplating apparatus that contain a brine solution, a battery, wires, and alligator clips that kept carbon rods attached to the metal to be electroplated and the metal to be layered.

This process is used to give objects increased wear resistance, corrosion protection or aesthetic appeal and greater thickness. While electroplating is like advanced technology. It is primarily used to change the physical properties of an object.

Thus, option B is correct.

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Answer:

The elements mentioned in the series are Na, Mg, Al, Si, and P. It can be seen that all these elements are located in the same period. The atomic number of the mentioned elements are Na-11, Mg-12, Al-13, Si-14, and P-15.

a) There will be an increase in the ionization energy with the increase in the element's atomic number across a period. More energy is needed to withdraw an electron from a completely occupied shell in comparison to an incompletely occupied shell.

The atomic number of Na is 11. When one electron is withdrawn from Na, it gets converted into the inert gas configuration of Ne. Thus, it will require more energy to withdraw the second electron from Na. Hence, Na exhibits the lowest second ionization energy.

b) Across the period, with an increase in the element's atomic number, the atomic radii reduces from left to right. Thus, P exhibits the smallest atomic radius.

c) The metallic nature of the elements reduces from left to right across a period in the periodic table. Thus, P is the least metallic element.

d) Diamagnetic signifies towards the element that exhibits pair electrons in its sub-shells. The electronic configuration of Mg is,

1s2 2s2 2p6 3s2

In Mg, no unpaired electrons are present, while all the remaining elements mentioned exhibit unpaired electrons in their valence shell. Thus, Mg is the diamagnetic element.

Answer:

they arent alcohols.

Explanation:

Answer:

D

Explanation:

The other three are related to

a. selling a home

b. buying a home

c. owning a home

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Answer:

b. 2.28 M

Explanation:

The reaction of neutralization of NaOH with H2SO4 is:

2NaOH + H2SO4 → Na2SO4 + 2H2O

Where 2 moles of NaOH react per mole of H2SO4

To solve the concentration of NaOH we need to find the moles of H2SO4. Using the chemical equation we can find the moles of NaOH that react and with the volume the molar concentration as follows:

Moles H2SO4:

45.7mL = 0.0457L * (0.500mol/L) = 0.02285 moles H2SO4

Moles NaOH:

0.02285 moles H2SO4 * (2moles NaOH / 1 mol H2SO4) = 0.0457moles NaOH

Molarity NaOH:

0.0457moles NaOH / 0.020L =

2.28M

Right option:

The concentration of the starting NaOH solution is:

b. 2.28 M

Neutralization reaction:

The reaction of neutralization of NaOH with H₂SO₄ is:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

We need to find the moles of H₂SO₄. Using the chemical equation we can find the moles of NaOH.

Moles of H₂SO₄:

45.7mL = 0.0457L * (0.500mol/L) = 0.02285 moles of H₂SO₄

Moles of NaOH:

0.02285 moles H₂SO₄ * (2moles NaOH / 1 mol H₂SO₄) = 0.0457moles NaOH

Molarity of NaOH:

0.0457moles NaOH / 0.020L =2.28M

Thus, the concentration of the starting NaOH solution is: 2.28 M.

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Answer:

OB

Explanation:

wat does aquire mean

Answer:

a

Explanation:

a damaged stem