Plz Help me with this ?

Answer:

Option C

Explanation:

Litmus paper shows only whether the solution is acidic or basic, but not how strong it is.

=> Base turns the red litmus paper blue

=> Acid turns the blue litmus paper red.

Answer:

w&x

Explanation:

The planets which are likely to be gas giants are W and X

Gas giant planets are planets which constitutes of only two gases; hydrogen and helium.

However, of all the planetry solar system, there are only four planets which are the major gas giant planets:

In conclusion, the planets which are likely to be gas giants are W and X

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Answer: B: Earths tilt

Explanation:

Seasonal variation occurs because the Earth is tilted on its axis by 23.5˚. As Earth orbits the sun, its orientation to the sun changes.

Answer:

D. all of the above.

Explanation:

The kinetic-molecular theory of gases suggests that; the particles of a gas move independently of each other, the particles in a gas move rapidly, the particles in a gas are far apart.

Hope it helps.

Answer:

0° Celsius

Explanation:

The thermometer shows 0° Celsius which corresponds to 32° F.

Answer:

0 degrees celsius

Explanation:

just did the test

Answer:

0.01836 M

Explanation:

Again the reaction equation is;

Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s)

E°cell= 0.77 V

Ecell= 0.78 V

[Mn2+] = 0.040 M

[Fe2+] = the unknown

n=2

From Nernst's equation;

Ecell= E°cell- 0.0592/n log Q

0.78= 0.77 - 0.0592/2 log [Fe2+] /[0.040]

0.78-0.77= - 0.0592/2 log [Fe2+] /[0.040]

0.01/ -0.0296= log [Fe2+] /[0.040]

-0.3378= log [Fe2+] /[0.040]

Antilog(-0.3378) = [Fe2+] /[0.040]

0.459= [Fe2+] /[0.040]

[Fe2+] = 0.459 × 0.040

[Fe2+] = 0.01836 M

The Fe ion concentration in the galvanic cell has been 0.0186 M.

The Nernst equation has been used for the determination of the voltage of the galvanic cell.

It can be given as:

[tex]\rm E_c_e_l_l\;=\;E_0\;-\;\dfrac{0.059}{n}\;\times\;log\;\dfrac{[Fe^+]}{[Mn^2^+]}[/tex]

where, n = number of electrons transfer = 2

[tex]\rm E_0[/tex] = initial voltage = 0.77 V

[tex]\rm E_c_e_l_l[/tex] = cell voltage = 0.78 V

Iron ion concentration = 0.040 M

Susbstituting the values:

0.78 = 0.77 - [tex]\rm \dfrac{0.059}{2}\;\times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]

0.78 - 0.77 = -0.0296 [tex]\rm \times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]

-0.03378 = [tex]\rm log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]

antilog (-0.03378) = [tex]\rm \dfrac{[Fe^2^+]}{0.040}[/tex]

Iron ion concentration = 0.0186 M

Thus, the Fe ion concentration in the galvanic cell has been 0.0186 M.

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Answer:

8

Explanation:

Since Xe (xenon) is a noble gas, it has 8 valence electrons. It's outer shell is full and it is a stable element and doesn't like to react. Therefore, since the electron dot diagram is about valence electrons, 8 would be your answer.

Answer:

Metal

Explanation:

Lithium (Li), chemical element of Group 1 (Ia) in the periodic table, the alkali metal group, lightest of the solid elements. The metal itself—which is soft, white, and lustrous—and several of its alloys and compounds are produced on an industrial scale.

Atomic number: 3

Atomic weight: 6.941

Answer:

b-Mg

d-Ca

Explanation:

all the group two metals have oxidation of 2

Answer:

Calcium , Magnesium

Explanation:

APEX

An exothermic reaction creates heat.

The answer would be c) energy is released in the form of heat.

A chemical  reaction is classified as exothermic or endothermic based on the direction of heat flow during the reaction

The correct option for what must occur for a reaction to be classified as an exothermic reaction is option C

C) Energy is released in the form of heat

The reasons the above value is correct are;

An exothermic reaction is one in which energy in the form of light, heat or other forms because the sum of the energy in the product is less than the sum of energy contained in the reactants

Therefore, for a chemical reaction to be specifically classified as an endothermic reaction, instead of an exothermic reaction, is energy, in the form of heat (or light) must be released

The correct option is option C

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Answer:

if excess acid is added to the solution, it will be more acidic.

Explanation:

The pH of potassium hydroxide= 10 (OH- ions)

pH of hydrochloric acid= 3  (H+ ions)

  KOH + HCl → KCl + H2O  

the pH of the solution will be 7  as it is a neutralisation reaction.

But if the acid is more in amount there will be more H+ ions and the solution will have a lower pH.

(the higher the concentration of H+ ions the more the acidic the solution,

the higher the concentration of OH- ions the more alkaline a solution is. )

Answer:

A. Arsenic

Explanation:

Arsenic is a metalloid. Arsenic has properties of both metals and non-metals that is why it is a metalloid.

Potassium, chlorine, and indium do not have both properties of metals and non-metals, therefore they are not metalloids.

Answer: A

Explanation: have a nice day

Answer:

The answer is explained below

Explanation:

The question is not complete.

The correct question should be like:

Which of the measurement contain three significant figure?

500

395

0.001

0.00100

1 × 10⁻³

5 × 10²

Answer:

The following are rules applied when considering significant figures:

i) All digits are significant excluding zero. E.g of significant digits are 1,2,3,4,5,6,7,8,9

ii) Any zero that appear within or after non zero digits are significant e.g. 200, 1004, 500009

iii) Zeros before non zero digits are not significant. An example shows significant digits bolded 001,  0.0012, 001.56

iv) Zeros that come after non zero digits are significant even if the number is in decimal form. An example shows significant digits bolded 1000,  0.001200, 001.5600

Therefore:

500: It contains three significant digits

395: It contains three significant digits

0.001:  It contains only one significant digits

0.00100: It contains three significant digits

1 × 10⁻³: 1 × 10⁻³ = 0.001.  It contains only one significant digits

5 × 10²: 5 × 10² = 500. It contains three significant digits

The measurements that contain three significant figure are 500, 395, 0.00100 and 5 × 10²

Answer:

Al(s) + Fe³⁺ ----> Al³⁺(aq)  + Fe²⁺(aq)

Explanation:

The reaction between aluminium metal with an aqueous solution of Fe³⁺ ions to produce Al³⁺ ions and Fe²⁺ ions is a redox reaction in which the aluminium metal is oxidized while the Fe³⁺ ions are reduced.

Oxidation occurs if the oxidation number of an element or ionic species increases in the positive direction whereas reduction occurs when the oxidation number of the reacting species decreases.

The oxidation number of aluminium increases from 0 to +3 whereas  the oxidation number of iron reduces from +3 to =2 in the given reaction.

In a net ionic equation, only the species participating in the reaction are shown.

The equation is given below;

Al(s) + Fe³⁺ ----> Al³⁺(aq)  + Fe²⁺(aq)

Answer:

Option 3

[tex]MgCO_{3}[/tex]

Explanation:

These are the steps for empirical forumla

1) If given percentage, assume everything in grams

2) Convert those grams to moles (using specific molar mass of each unique element)

3) Divide all the moles by the smallest mole you discovered.

4) Answer will be close to a whole number for each element and that's the answer.

First step, 28.6 g Mg, 14.3 g C, 57.1 g O

Second step:

28.6/24.305 = 1.1767 Mg

14.3/12.01= 1.1907 C

57.1/16.00 = 3.5688 O

Third step:

1.1767/1.1767 = 1 Mg

1.1907//1.1767 ~ 1 C

3.5688/1.1767 ~ 3 O

Put everything together you get!

[tex]MgCO_{3}[/tex]

The empirical formula for the compound is:

C. [tex]MgCO_3[/tex].

A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule.

Given:

28.6 g Mg, 14.3 g C, 57.1 g O

In order to determine empirical formula we will divide mass of each given  element with the molar mass of the respective element.

[tex]\frac{28.6}{24.305} = 1.1767 Mg[/tex]

[tex]\frac{14.3}{12.01}= 1.1907 C[/tex]

[tex]\frac{57.1}{16.00} = 3.5688 O[/tex]

Dividing each mass with the lowest mass:

[tex]\frac{1.1767}{1.1767 } = 1 Mg[/tex]

[tex]\frac{1.1907}{1.1767 } = 1 C[/tex]

[tex]\frac{3.5688}{1.1767} =3 O[/tex]

Thus, the empirical formula for the compound is [tex]MgCO_3[/tex].

Therefore, option C is correct.

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Answer:

Mass (m) = Number of moles(n) × Molar mass (M)

A. 6.65 mol W

M (W) = 184 g/mol

n = 6.65mol

mass of W = 6.65 × 184 = 1223.6g

B. 0.588 mol Ba

M(Ba) = 137g/mol

n = 0.588 mol

mass of Ba = 0.588 × 137 = 80.556g

C. 68.4 mol Xe

M(Xe) = 131g/mol

n = 68.4 mol

mass of Xe = 68.4 × 131 = 8960.4g

D. 1.57 mol S

M(S) = 32.1 g/mol

n= 1.57 mol

mass of S = 1.57 × 32.1 = 50.397g

Hope this helps

Answer:

a. N₂(g) + O₂(g) → 2 NO(g)

b. 2 HgO(s) → 2 Hg(l) + O₂(g)

c. 4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(s)

d. 2 Na(s) + Cl2(g) → 2 NaCl(s)

e. 2 Cu₂O(s) + O₂(g)  → 4 CuO(s)

Hope this helps.

Answer:

50.45679

Explanation:

mass of 1 mole(6.02 x 10^23atoms) of copper: 63.546g

so,

63.546g x 4.78 x 10^23 / 6.02 x 10^23 = 50.45679g (you could round this to the nearest decimal if u wish so)

Answer:

B. psi

Explanation:

Pa is Pascal

atm is atmosphere

Hg is Mercury

hope it helps.

The time taken to complete the reaction is 179 seconds.

Rate of reaction is the time taken for a reaction to attain completion. From the data presented, we have;

Initial concentration  = No

Final concentration = No - (0.8No) = 0.2No

rate constant = 9.2 x 10−3 s−1

time taken = t

Given that;

N =Noe^-kt

0.2No =Noe^-( 9.2 x 10−3 t)

0.2 = e^-( 9.2 x 10−3 t)

ln(0.2) = 9.2 x 10−3 t

t = ln(0.2)/-9.2 x 10−3

t = -1.609/-0.009

t= 179 seconds

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Answer:

The correct answer is C. Plz mark brainiest

Explanation:

The answer is

O ionic

Answer: Polar covalent

Explanation: Gradpoint

Answer:

a. 1,2,and 3.

Explanation:

When something turns liquid, e.g. metal, you need to heat it. When something turns gas, e.g. water, you need to heat it. And when something goes directly from solid to gas, e.g. dry ice, carbon dioxide, you need to add heat to it. hope this helps! Please mark brainiest.

Answer:

Option D. For every mole of iron oxide consumed, two moles of iron are produced.

Explanation:

The balanced equation for the reaction is given below:

Fe2O3 + 3CO —> 2Fe + 3CO2

From the balanced equation above,

1 mole of iron oxide, Fe2O3 reacted with 3 moles of carbon monoxide, CO to produce 2 moles of iron, Fe and 3 moles of carbon dioxide, CO2.

Thus, with a careful observation of the equation, we can conclude that for every 1 mole of iron oxide, Fe2O3 consumed, 2 moles of iron, Fe are produced.

Answer:

sulfuric acid and potassium hydroxide is actually the answer, not the girls above me.

Explanation:

EDU SAID SO

The two compounds are used in batteries are sulfuric acid and potassium hydroxide.

The chemicals present in a different type of batteries are sodium chloride, sulfuric acid, hydrochloric acid, chloric acid, potassium nitrate, nitric acid, sodium hydroxide, magnesium hydroxide and sodium acetate.

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Answer:

salt

Explanation:

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Answer:therefore the oxidation state of sulphur is +6 in the compound CaSO4.

Explanation:

Answer:

No because hydrogen chloride is gas and hydrochloric acid is (as stated in the name) an acid. The formula for hydrogen chloride is HCI(g), the little g states that the compound is a gas and the formula for hydrochloric acid is HCl(aq) and the little aq means aqueous.

Answer:

no. they are not the same

Explanation: Although, they both do have the same chemical formula HCL, they differ in their states of matter. Hydrogen chloride is a gas whereas hydrochloric acid is a solution of hydrogen chloride gas and water( creates an aquaeous solution). Hydrochloric acid is highly corrossive.

Answer:

atoms are bonded with a single bond one double bond