Can u please help me , I couldn’t figure it out for hours. It’s just q e not d or 6 .

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

Explanation:

Answer:

B. psi

Explanation:

Pa is Pascal

atm is atmosphere

Hg is Mercury

hope it helps.

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:

salt

Explanation:

xdcfgvh jhg

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:

b-Mg

d-Ca

Explanation:

all the group two metals have oxidation of 2

Answer:

Calcium , Magnesium

Explanation:

APEX

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:

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:

1) The full electron configuration for phosphorus is 1s²2s²2p⁶3s²3p

2) Phosphorus is paramagnetic

Explanation:

1) To write the electron configuration, we follow the electron filling order, that is starting from 1s, to 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4f, 5s, 5p, 5d, 6s till the electrons are all accounted for (up to 58)

We note that the s orbitals can each take two electrons while the p orbital can take 6 electrons and the d orbital can take 10 electrons

The electron configuration chart for phosphorus, P, is given as follows;

1s²2s²2p⁶3s²3p.

2) Diamagnetism is the temporary magnetism is the magnetism of a material that exists in the presence of a magnetic field due to a a change in the atomic electron orbital motion

Paramagnetism is a magnetism in which a material is weakly attracted by an applied external magnetic field such that there is induced magnetism in the applied magnetic field direction

Paramagnetic materials have have unpaired electrons that give them permanent magnetic moments in the absence of an applied magnetic field as such unpaired electrons are termed paramagnetic electrons and atoms that have one or more unpaired electrons are paramagnetic

Phosphorus, with the 3 partially filled p orbitals have 3 unpaired electrons in their outermost shell giving them the overall properties of a paramagnetic materials.

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.

For more information about the galvanic cell, refer to the link;

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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:

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:

i got ddoxed by skai jackson

Explanation:

it sucked

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:

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: Non Metal

Explanation: Boron. Boron is a non metallic element and the only non-metal of the group 13 of the periodic table the elements

Answer:

it is perpendicular to the surfaces that rub together

The Statement that describe friction is perpendicular to the surfaces that rub together.

Friction is the force or resistance that act on a body in motion or when one body rub against each other.

It is the gliding and sliding that occur in a body in motion.

Therefore, The Statement that describe friction is perpendicular to the surfaces that rub together.

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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:

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)

The answer is

O ionic

Answer: Polar covalent

Explanation: Gradpoint

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.

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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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:

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:

The correct answer is C. Plz mark brainiest

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:

4,3,2

Explanation:

if you balance a chemical equation that is the correct coefficients to be placed in the blank space

Answer:

Coefficients = { 4, 3, 2 }

Explanation:

The previous answer is correct, but I want to show you how to balance this chemical reaction. First take a look at the number of each element present in the reactant and product side -

Reactant                        |                         Product

Aluminum = 1                                          Aluminum = 2

Oxygen = 2                                             Oxygen = 3

As you can see, if you were to double the aluminum on the reactant side, the reactant and product side with respect to aluminum would be balanced. 2 and 3 share a least common multiple of 6, so if we were to triple the amount of oxygen on the reactant side and double the amount of oxygen on the product side - either side would be balanced!

Now there is one default in this. The number of aluminum and oxygen on the product side are present as the same compound. Let us say we were to still triple the amount of oxygen on the reactant side and double the amount of oxygen on the product side. That would satisfy the oxygens. The chemical equation would then be as such -

Al + 3O2 -----> 2Al2O3

Now let us balance the number of aluminums on either side. There is 1 aluminum on the reactant side, with respect to 4 aluminums on the product side. The coefficient of aluminum on the reactant side should thus be four -

4Al + 3O2 -----> 2Al2O3

Coefficients = { 4, 3, 2 }