Na-23 has 12 neutrons. What is it’s atomic number?

The correct answer is A. It is uniform in composition and the parts that make up the mixture can be separated from one another through physical means.

Explanation:

In a homogeneous mixture, components are completely integrated, which means the final substance is uniform and the parts that compose it are not separated. This occurs in milk because this integrates uniformly water, fat, among others, and these elements cannot be observed separately.

Moreover, in mixtures, components can be separated through physical means; for example by heating the substances. This applies to milk because if it is heated water evaporates, and therefore can be separated.

Answer:

the original concentration of A = 0.0817092  M

Explanation:

A reaction is considered to be of first order it it strictly obeys the graphical equation method.

[tex]k_1 = \dfrac{2.303}{t}log \dfrac{a}{a-x}[/tex]

where;

k = the specific rate coefficient  = 3.4 × 10⁻⁴ s⁻¹

t = time   = 5.0 h = 5.0 × 3600 = 18000 seconds

a = initial concentration = ???

a - x = remaining concentration of initial concentration at time t = 0.00018 mol L⁻¹

[tex]3.4 \times 10^{-4}= \dfrac{2.303}{18000}log \dfrac{a}{0.00018}[/tex]

[tex]3.4 \times 10^{-4}= 1.27944 \times 10^{-4} \times log \dfrac{a}{0.00018}[/tex]

[tex]\dfrac{3.4 \times 10^{-4}}{1.27944 \times 10^{-4}}= log \dfrac{a}{0.00018}[/tex]

[tex]2.657= log \dfrac{a}{0.00018}[/tex]

[tex]10^{2.657}= \dfrac{a}{0.00018}[/tex]

[tex]453.94 = \dfrac{a}{0.00018}[/tex]

[tex]a =453.94 \times 0.00018[/tex]

a = 0.0817092  M

Thus , the original concentration of A = 0.0817092  M

Answer:

The correct answer is: 1.035 x 10⁻³ M

Explanation:

The dissociation equilibrium for acetic acid (CH₃COOH) is the following:

CH₃COOH(aq) ↔ CH₃COO⁻(aq) + H⁺(aq)  Kc = 1.8 x 10⁻⁵

The expression for the equilibrium constant (Kc) is the ratio of concentrations of products over reactants. The products are acetate ion (CH₃COO⁻) and hydrogen ion (H⁺) while the reactant is acetic acid (CH₃COOH):

[tex]Kc=\frac{[CH_{3} COO^{-} ][H^{+} ]}{[CH_{3} COOH]}= 1.8 x 10^{-5}[/tex]

Given: [CH₃COOH]= 0.016 M and [CH₃COO⁻]= 0.92 M, we replace the concentrations in the equilibrium expression and we calculate [H⁺]:

[tex]\frac{(0.016 M)[H^{+} ]}{(0.92M)}= 1.8 x 10^{-5}[/tex]

⇒[H⁺]= (1.8 x 10⁻⁵)(0.92 M)/(0.016 M)= 1.035 x 10⁻³ M

Answer:

Ankara is the capital of Turkey! Hope this helped you out! :)

Explanation:

The capital of Turkey is Ankara

hopefully this helped :3

Answer:

Option B. K = 1.3×10⁴, product favored

Explanation:

Data obtained from the question include:

O2(g) + 2SO2(g) <==> 2SO3(g)

Concentration of O2, [O2] = 0.024 M

Concentration of SO2, [SO2] = 0.015 M

Concentration of SO3, [SO3] = 0.26 M

Equilibrium constant, K =..?

The equilibrium constant, K is simply defined as the ratio of the concentration of products raised to their coefficient to the concentration of the reactants raised to their coefficient.

The equilibrium constant for the above reaction can be written as

K = [SO3]² / [O2] [SO2]²

Inputing the values of [SO3], [O2] and [SO2] the equilibrium constant, K is:

K = [SO3]² / [O2] [SO2]²

K = 0.26² / 0.024 × 0.015²

K = 1.3×10⁴

Therefore, the equilibrium constant K is 1.3×10⁴.

Since the value of the equilibrium constant, K is large and positive, therefore, the reaction favours the product.

Answer:

The given hydrocarbon is Glycerol

Answer:

three electrons were transferred in the process

Explanation:

The electrode potential of the cathode is

E°cathode= E°cell + E°anode

E°cathode = 2.35V + (-0.74V)

E°cathode= 1.61 V

Let us look at the reduction half equation; the oxidation half equation must be;

Oxidation half equation;

Cr(s) ----> Cr^3+(aq) + 3e

The reduction half equation must now be

Reduction half equation;

3Ce^4+(aq) + 3e ----> 3Ce^3+(aq)

This implies that three electrons were transferred in the process as shown by the balanced half cell reaction equations.

Answer:

pH and pOH denote the negative log of the concentration of hydrogen or hydroxide ions. High pH means that a solution is basic while high pOH means that a solution is acidic. ... So here the basic definition of pH is that it's equal to negative log base 10 of the concentration of protons in your solution.

pH and pOH are inversely proportional to one another i.e. as one increases, the other decreases and vice versa.

pH and pOH are terms used to measure the level of acidity or alkalinity of a substance.

A basic solution has a pOH less than 7, while an acidic solution has a pOH greater than 7.

On the other hand, a basic solution has a pH greater than 7 while an acidic solution has a pH lesser than 7.

Therefore, it can be said that pH and pOH are related inversely i.e. as one decreases, the other increases.

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Answer:

Option A is the correct option.

Explanation:

[tex] \frac{p1 \: v1}{t1} = \frac{p2 \: v2}{t2} [/tex]

[tex]p2 = \frac{p1 \: v1 \: t2}{t1 \: v2} [/tex]

[tex]p2 = \frac{2.45 \times 8 \times 550}{273 \times 11.8} [/tex]

[tex]p2 = 3.35 \: atm[/tex]

Partial pressure of N² :

[tex]3.35 \times \frac{78.08}{100} [/tex]

[tex] = 2.61 \: atm[/tex]

Hope this helps..

Best regards!!

Answer:  2.61 atm

Option A is the correct option.

....

...

..

.

Answer:

2Ag(+1)(aq) + S(-2)(aq) --> Ag2(+1)S(-2)(aq)

Explanation:

The final equation is

2Ag(+1)(aq) + S(-2)(aq) --> Ag2(+1)S(-2)(aq)

2Ag(+1)NO3(-1)(aq) + Na2(+1)S(-2)(aq) --> Ag2(+1)S(-2)(s) + 2Na(+1)NO3(-1)(aq)

AgNO3, Na2S, and NaNO3 are all strong electrolytes, so we immediately separate those, making the new equation:

2Ag(+1)(aq) + 2NO3(-1)(aq) + 2Na(+1)(aq) + S(-2)(aq) --> Ag2(+1)S(-2)(s) + 2Na(+1)(aq) + 2NO3(-1)(aq)

After that, you cancel out all the ions that appear more than once, which in this case would leave us with a final equation of...

2Ag(+1)(aq) + S(-2)(aq) --> Ag2(+1)S(-2)(aq)

Answer:

Explanation:

C

Answer:

partly ionic and partly covalent

Answer:

(a) Total impurities = 17.5%

(b)

(i) 5 tons of ore yields 2185 kg of aluminium

(ii) 5 tons of ore contains 375 kg of sand

(c) Percentage of Al2O3 in purified ore = 825/900 = 91.7%

Explanation:

Q7. Aluminum is extracted from the ore bauxite, which is impure aluminum oxide.

1 tonne (1000 kg) of the ore was found to have this composition:

1. aluminum oxide 825 kg  (82.5%)

2.iron(III) oxide 100 kg  (10%)

3.sand 75 kg (7.5%)

(a) Since we are interested only in extracted aluminium, everything other than aluminium oxide is considered impurity, which includes Fe2O3 (10%) and sand (7.5%).  Total impurities = 10+7.5 = 17.5%

(b)  "1 tonne of the ore gives 437 kg of aluminum."

(i) 1 ton of ore : 437 kg Al  = 5 tons of ore : x kg of Al

Cross multiply

x = 5 tons * 437 kg / 1 ton = 2185 kg of aluminium

(ii) 1 ton of ore contains 75 kg of sand

5 tons of or contains x kg

x = 5*75/1 = 375 kg of sand

(c) If the ore is purified from Fe2O3, then for each ton of ore, there will be left

825 kg of aluminium oxide,

75 kg of sand

for a total of 900 kg.

Percentage of Al2O3 = 825/900 = 91.7%

Answer:

A) 17.5 %

B) 1) 2135 kg

2) 375 kg

C) 91.8%

Explanation:

Part (A):

1 tonne = 1000 kg = 100%

Aluminium oxide = 825 kg = 82.5%

Iron (III) oxide = 100 kg = 10%

Sand = 75 kg = 7.5%

That makes total of 100%

So, the percentage of impurities = Iron (III) oxide + Sand

=> 10 + 7.5 = 17.5%

Part (B):

(1) 1 tonne = 427 kg

Multiplying both sides by 5

=> 5 tonne = 427 * 5

=> 5 tonnes = 2135 kg

(2) 1 tonne contains 75 kg sand as impurity

=> 1 tonne = 75 kg

Multiplying both sides by 5

=> 5 tonnes = 75*5

=> 5 tonnes = 375 kg

Part (C):

If all of the iron oxide was removed, then only aluminium and sand are left.

Aluminium = 825 kg

Sand = 74 kg

Total of them makes it:

=> 825 + 74 = 899

So,

%age of Aluminium = [tex]\frac{825}{899} * 100[/tex]

%age of Aluminium = 0.918 * 100%

%age of Aluminium = 91.8%

Answer:

carbohydrates are energy giving foods that warm the body and could be in different forms

Answer and Explanation:

Carbohydrates are a type of biomolecule that the body uses primarily for energy and/or structure. They usually consist of the elements carbon (C), hydrogen (H), and oxygen (O) in a 1 : 2 : 1 ratio. For example, glucose, a carbohydrate, is [tex]C_6H_{12}O_6[/tex].

Monomers of carbohydrates are called monosaccharides, and polymers are called disaccharides if two monosaccharides are combined and polysaccharides if more than two monosaccharides are put together.

Examples of carbohydrates are sugars, starches, cellulose, lactose, sucrose, etc.

Answer:

 pH

 7.0 = neutral.

(7–14) =  basic

(0–6) =  acidic

Explanation:

Explanation:

pH is used to measure the concentration of H+ ions ([H+]) and therefore, whether a substance is acidic or basic (alkaline). Solutions with a pH of less than seven are acidic, while those with a pH greater than seven are basic (alkaline).

Answer:

greater than 7

Explanation:

A base is any solution with a pH greater than 7. A pH of 7 is considered neutral. For example, the pH of water. An acid is any solution with a pH less than 7.

Hope that helps.

Answer:

We don't know what solvent X and solvent Y are, but from the chart, we can see that in solvent X, hydrochloric acid can conduct electricity (bulb lights up), and react with calcium carbonate.

So, we can say the electrical conductivity when HCl is dissolved in solvent X is high, and when HCl is dissolved in solvent Y, the electrical conductivity is low (because light bulb doesn't light up).

Additionally, in solvent X, HCl ionizes, this shows the property of acids: reacts with carbonates to give CO2 (because CO2 reacts with lime water to make it cloudy).

In solvent Y, HCl does not ionize, so there is no reaction between acid and calcium carbonate.

Answer:

Depends from where the light is

Explanation:

If it is in the north pole than it will be 0°C

Answer:

You cannot freeze light.

Explanation:

Only some scientists have been able to freeze light. But, they have only been able to freeze light for about 1 minute.

Explanation:

ascorbic acid is lemon

lemon contain ascorbic acid....

it is organic acid.....

Answer:

18 electrons

Explanation:

Each electron carry a -1 charge.

Since Oxygen atom originally has 16 electrons (same no. as no. of protons, where net charge as 0), it must add 2 electrons to bring the net charge to -2. Hence, the number of electrons in this ion is 16 + 2 = 18.

Answer:

The correct option is;

decreasing entropy is a nonspontaneous

Explanation:

Recycling of aluminium beverage cans involves the process of remelting scrapped beverage after the cans were first produced and used initially

1) The cans are cut into pieces so as to make them more compact and accessible for cleaning

2) The cans are then blocked and melted by heating and the impurities and hydrogen gas are removed

3) The composition of the molten aluminium alloy is altered by the addition of the alloy composition to get the right specification of the alloy

4) The molten alloy can then be sent for usage where it will be processed into solid aluminium objects without the requirement for much energy addition

By the second law of thermodynamics, processes 1, and 2 which involve the addition of energy from the surrounding to decrease the randomness of the scrapped beer cans such that the entropy of the surrounding decreases are not spontaneous processes, while process 4 where the molten aluminium will be cooled down to form solid aluminium does not require energy input but adds energy to the surrounding in the surrounding's entropy, is therefore a spontaneous process.

Therefore, decreasing the entropy of the universe by heating aluminium to melt it is a non spontaneous process

The two terms apply to oceanic crust rather than continental crust C. Denser and D. Younger in age

Oceanic Crust Oceanic crust, extending 5-10 kilometers (3-6 kilometers) beneath the ocean floor, is mostly composed of different types of basalts. Geologists often refer to the rocks of the oceanic crust as “sima.” Sima stands for silicate and magnesium, the most abundant minerals in oceanic crust.

Oceanic crust is thin (6 km thick) and dense (about 3.3 g/cm), consisting of basalt, gabbro, and peridotite. They include oceanic sediments (e.g. radiolarites, turbidites) and oceanic crust (e.g. basalt, pillow lava).

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Answer:

2.22 x  10²³

Explanation:

first we have to find number of moles

mol = 10/27

mol= 0.37 mol

Now,

number of atoms = mole x 6 x 10²³

                             = 0.37 x 6 x 10²³

                            = 2.22 x  10²³

Answer:

The correct answer is - the second law of thermodynamics.

Explanation:

The second law of thermodynamics says that the in all heat energy exchange or transfer, and if there is no gain or lose of energy in a system, the potential energy of the particular state in that system will less than that of initial state of the system in any case.

It also suggests that the processes deals with the conversion of the heat energy are irreversible and the energy can be transfer from lower temperature system to higher temperate system without adding energy.

Thus, The fact that a heat pump requires energy to move heat from a colder object to a hotter object is a real life example of the second law of thermodynamics.

Answer:

306.6g/mol

Explanation:

To calculate molecular weight you need to know how many grams ou have in a determined amount of moles of substance. As you have the mass of the sample (1.42g), you need to find how many moles are, as follows:

The reaction of the acid HX with the base YOH is:

HX + YOH → H₂O + YX

1 mole of acid reacts per mole of base.

In a titration, the solution turned pink when moles base = moles acid.

Moles of base that the student added (Using the volume and molarity of the solution) are:

32.48mL = 0.03248L ₓ (0.1426 moles base / L) = 0.004632 moles of base

As the titration is in equivalence point, there are 0.004632 moles of the acid

Molecular weight (Ratio between grams of sample and its moles) is:

1.42g / 0.004632 moles =

Answer:

D- Assertion is false and Reason is true

Explanation:

Precipitation is said to have occurred when an insoluble product is formed from soluble ones. Let us take an instance;

BaCl2(aq) + H2SO4(aq) -------> BaSO4(s) + 2HCl(aq)

The barium sulphate so formed is an insoluble product obtained from the reaction of soluble barium chloride and sulphuric acid. This is a typical example of a double replacement reaction as the both ions exchanged partners.

Thus, the assertion is false but the reason is true.

Answer:

HC2H3O2

Explanation:

Acetic acid is a colorless organic compound liquid called ethanoic acid. It has molar mass of 60.052 g/mol. It is soluble in water. Its formula is CH3COOH. If water is combined with HC2H3O2 then it will give rise to acetic acid solution. When acetic acid is combined with water it creates hydronium and acetate ions.

Answer: the answer is B estimation

Explanation:

i just took a test

The one that is represented by the number of significant figures in a quantity is scientific notation. The correct option is D.

Scientific notation is a method of expressing numbers that are either too large or too small to be written in decimal form.

In the United Kingdom, it is known as scientific form, standard index form, or standard form.

The proper scientific notation format is an x 10b, where an is a number or decimal number with an absolute value greater than or equal to one and less than ten, or 1 |a| 10. b is the power of ten required for scientific notation to be mathematically equivalent to the original number.

Scientific notation is represented by the number of significant figures in a number.

Thus, the correct option is D.

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Answer:

5.31×10¯²³ g.

Explanation:

Data obtained from the question include:

Molar weight of O2 = 32 g/mol

Mass of 1 oxygen atom =..?

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms.

This implies that 1 mole of O2 also contains 6.02×10²³ atoms.

1 mole of O2 = 32 g

The mass of 1 atom of O2 can be obtained as follow:

32 g of O2 contains 6.02×10²³ atoms.

Therefore Xg of O2 will contain 1 atom i.e

Xg of O2 = 32/6.02×10²³

Xg of O2 = 5.31×10¯²³ g

Therefore, the mass of a single oxygen atom is 5.31×10¯²³ g.

The mass of a single oxygen atom is 5.31 x 10⁻²³ grams. Therefore, option D is correct.

The molecular weight of oxygen gas is 32 g/mol. To find the mass of a single oxygen atom, divide the molecular weight by Avogadro's number (6.022 x 10²³ atoms/mol).

Avogadro's number (6.022 x 10²³) represents the number of particles (atoms, molecules, or ions) in one mole of a substance.

To find the mass of a single oxygen atom, divide the molecular weight of oxygen gas by Avogadro's number:

Mass of a single oxygen atom = (32 g/mol) / (6.022 x 10²³ atoms/mol)

Simplifying the expression:

Mass of a single oxygen atom = 5.31 x 10⁻²³ g

Therefore, the mass of a single oxygen atom is 5.31 x 10⁻²³ grams.

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Answer:

when the coal is heat with presence of oxygen it's called combustion...