How many moles of na2so4 are present in 284.078 grams of na2so4?
a. 2
b. 3
c. 5
d. 6

Answers

Answer 1
There are 2 moles of NA2SO4 present in 284.078 grams of NA2SO4. Why? Well, we already know here that there are 284.078 grams of NA2SO4. To find how many moles are present in this compound, we would have to divide these grams by the molar mass of the compound. When we go to the periodic table of elements, we will find that there are two moles sodium (which represents 45.98 grams), one mole sulfur (which represents 32.06 grams), and four moles oxygen (which represents 64 grams). When combining these, we would get one mole of sodium sulfate which is representative of 142.04 grams total. That is our molar mass. Now that we have the molar mass, we can go back and divide. 284.078 divided by 142.04 is equal to about 1.99999, and that rounds up to 2 moles. Hence, there are 2 moles of NA2SO4 present in 284.078 grams of NA2SO4.

Your final answer: A is your answer.

Related Questions

How many miles of silver will be generated if 1.30 miles of zinc is placed into silver nitrate solution

Answers

2.60 moles.

Zn (s) + 2 Ag+ (aq) --> 2 Ag (s) + Zn2+ (aq), each mole of zinc gives out two moles of silver. Therefore, 1.30 moles of zinc will displace 2.60 moles of silver. ( 1.30 × 2)

More about silver nitrate:

An inorganic substance with the chemical formula AgNO3 is silver nitrate. This salt serves as a flexible base for numerous different silver compounds, including those employed in photography. Compared to halides, it is far less light-sensitive. Lunar caustic was previously the name given to it since early alchemists referred to silver as luna and connected it to the moon.

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What units are represented by the numbers marked on the meterstick.

Answers

Answer:

Centimeters

Centimeter

⇒ metric unit of length equal to 0.01 (1/100) of a meter

the volume of a 300 L sample of CO2(g) at 2.30 atm is compressed to 29.6 L, what
is the new pressure at constant temperature and moles?

Answers

Answer:

23,31 atm

Explanation:

p1v1 = p2v2

2.3 * 300  = p2 *29.6

p2=23.31 atm

Identify different hydro-meteorological hazards;

Answers

Hydrometeorological hazards are caused by extreme meteorological and climate events, similar as cataracts, famines, hurricanes, tornadoes, or landslides.

Hydrometeorology it’s a branch of meteorology and hydrology that studies the transfer of water and energy between the land face and the lower atmosphere.They regard for a dominant bit of natural hazards and do in all regions of the world, although the frequency and intensity of certain hazards and society’s vulnerability to them differ between regions. Severe storms, strong winds, cataracts, and famines develop at different spatial and temporal scales, but all can come disasters that beget significant structure damage and claim hundreds of thousands of lives annually worldwide. hourly, multiple hazards can do contemporaneously or spark slinging impacts from one extreme rainfall event.In addition to causing injuries, deaths, and material damage, a tropical storm can also affect in flooding and mudslides, which can disrupt water sanctification and sewage disposal systems, beget overflow of poisonous wastes, and increase propagation of mosquito- borne conditions

Therefore these are the hydro-meteorological hazards.

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functions of intercalary meristems​

Answers

increase stem/leaf length

Can someone help me please

Answers

Answer:D

Explanation:

Use the vertex form, y=a(x−h)2+ky=a(x-h)2+k, to determine the values of aa, hh, and kk.a=14a=14h=6h=6k=1k=1Find the vertex (h,k)(h,k).(6,1)(6,1)Find pp, the distance from the vertex to the focus.Find the distance from the vertex to a focus of the parabola by using the following formula.14a14aSubstitute the value of aa into the formula.14⋅1414⋅14Simplify.Combine 4 and 1/4 .1 /4/4Simplify by dividing numbersDivide 4 by 44.1/1Divide 1 by 1/1.Y=0 The Answer is D

Which two protests evolved from symbolic relationships of organism which resulted in eukaryotic organisms chloroplast

Answers

Red algae and euglena evolved from a symbiotic relationship of organisms, which resulted in eukaryotic organisms containing chloroplasts

Theory of endosymbiosis:


Early eukaryotes developed by the symbiotic connection of prokaryotes, in accordance with the endosymbiosis idea. Which two protists underwent symbiotic evolution, leading to the development of eukaryotic creatures with chloroplasts.

-Symbiotic relationships between two or more prokaryotic cells led to the evolution of the first eukaryotic cells. Greater prokaryotic cells invaded or devoured smaller prokaryotic cells. The connection provided a secure home and nourishment for the tiny cells. By absorbing part of the organic molecules or energy generated by the endosymbionts, the bigger cells (now referred to as hosts) profited.

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The cutoff frequency for a certain element is 1.22 x 1015 Hz. What is its work function in eV?
Hint: 1 eV 1.60 x 10-19 J
=[?] eV

someone please teach me how to solve this its gonna make me cry

Answers

The work function of the metal is obtained as 5.1 eV

What is the cutoff frequency?

The cutoff frequency is the frequency below which photo electric effect can not occur as electrons are not removed from the metal surface.

Now;

fo = 1.22 x 10^15 Hz

Wo = hfo

Wo = 6.6 * 10^-34 * 1.22 x 10^15

Wo = 8.1 * 10^-19 J

If 1 eV = 1.60 x 10-19 J

x eV = 8.1 * 10^-19 J

x = 8.1 * 10^-19/ 1.60 x 10-19

x = 5.1 eV

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Which of the following statements are true of thermal energy and kinetic
energy?
Check all that apply.
A. All the molecules or atoms in motion have kinetic energy.
B. All the molecules or atoms in motion have thermal energy.
C. Each molecule or atom in motion has thermal energy.
D. Each molecule or atom in motion has kinetic energy.

Answers

Answer:

A. All the molecules or atoms in motion have kinetic energy.

B. All the molecules or atoms in motion have thermal energy.

C. Each molecule or atom in motion has thermal energy.

D. Each molecule or atom in motion has kinetic energy.

Explanation:

A hydrate of zinc nitrate has the formula Zn(NO3)2 . xH2O. If the mass of 1 mol of anhydrous zinc nitrate is 63.67% of the mass of 1 mol of the hydrate, what is the value of x?

Answers

MM Zn(NO₃)₂ = 189.36 g/mol

mass 1 mol Zn(NO₃)₂ = 189.36 g

mass hydrate = 100 / 63.67 x 189.36 = 297.409 g

mass 1 mol hydrate = 297.409 g

MM hydrate = 297.409 g/mol

MM hydrate = MM Zn(NO₃)₂ + MM xH₂O

297.409 = 189.36 + x(18)

x = 6

what is the approximate distance from the far edge of one lobe to the far edge of the other?

Answers

The approximate distance from the far edge of one lobe to the far edge of the other is 2,100,000 light-years.

What is distance between far edge of  two lobes in solar system?

This distance measures the outer space between the edges of the two lobes in a given time.

The approximate distance from the far edge of one lobe to the far edge of the other in a solar system is about 2,100,000 light-years.

Thus, the approximate distance from the far edge of one lobe to the far edge of the other is 2,100,000 light-years.

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A syringe containing 35.0 mL of Xe gas at 298 K has a pressure of 0.980 atm. How many grams of Xe are in the syringe? Report your answer to the nearest 0.001 g

Answers

The mass of Xe present in the syringe given the data is 0.183 g

How to determine the mole of Xe Volume (V) = 35 mL = 35 / 1000 = 0.035 L Pressure (P) = 0.980 atm Temperature (T) = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?

Using the ideal gas equation, we can obtain the mole of Xe as follow:

n = PV / RT

n = (0.98 × 0.035) / (0.0821 × 298)

n = 0.0014 mole

How to determine the mass of XeMole = 0.0014 moleMolar mass of Xe = 131 g/moleMass of Xe = ?

Mass = mole × molar mass

Mass of Xe = 0.0014 × 131

Mass of Xe = 0.183 g

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The thermite reaction reacts iron (III) oxide, Fe2O3, with aluminium powder,Al, the form aluminium oxide, Al2O3 and iron, Fe.

A. a student reacted 16.0g of iron with 8.1g of aluminium powder. which of the two reactants is the limiting reagent? Show your working.

B. Calculate the maximum mass of iron of iron that could be formed using these quantities of reactants.

Answers

Answer:

This answer assumes that the strated "16.0g of iron" was meant to be 16.0 grams of iron(III) oxide.

Explanation:

To start, the thermite equation must be balanced.

I find:

1Fe2O3 + 2Al = 1Al2O3 + 2Fe

This tells us we need 2 moles of Al for every 1 mole of Fe2O3.  

Now calculate the moles of each reactant:

Moles Fe2O3:  16.0 g/159.7 g/mole = 0.100 moles Fe2O3

Moles Al:  8.1 /26.98 g/mole = 0.300 moles Al

The balanced equation says that in order to react all of the Fe2O3 we'd need twice that amount (in moles) of the Al.  (0.100 moles Fe2O3)*(2) = 0.200 moles Al.

Which of the two reactants is the limiting reagent?

We have more than enough moles of Al to react with 0.10 moles of Fe2O3.  (We have 0.300 moles Al and all we need is 0.200 moles to react with the 0.10 moles of Fe2O3.  Fe2O3 is the limiting reagent.

Calculate the maximum mass of iron of iron that could be formed using these quantities of reactants.

The balanced equation tells us that we will obtain 2 moles of Fe for every 1 mole of Fe2O3 consumed.  Since Fe2O3 is the limiting reagent, we will assume that it completely reacts.  That means 0.1 moles of Fe2O3 is reacted.  Since we expect twice that many moles of Fe, we should obtain 0.200 moles of Fe.  At 55.85 g/mole, we should obtain:

(0.200 moles Fe)*(55.85 g Fe/mole Fe) = 11.2 grams Fe

How many individual Ni atoms are contained in 1.25 grams of Ni? (Input your answer with scientific notation using "e-notation" and report your answer to two places past the decimal point.

Answers

Answer:

Ni atoms are contained in 1.25gram is 1.28e22 atoms.

Explanation:

Ni atoms are contained in 1.25gram is 1.28e22 atoms.

We have a Nickel(Ni)  atom . The atomic number of Ni is 28 .It is a silvery-white metal with a slight golden tinge. Ni belongs to the transitional metal series.

The electronic configuration of Ni = Ar4d⁸35²

Nickel is slowly oxidized by air at room temperature.

Nickel is a ferromagnetic element at approximately room temperature.

To answer the problem , we first need to divide by the molar mass of Ni to get the moles of Ni. And then we will multiply by Avogadro's number to find the number of Ni atoms.

Molar mass of Ni = 58.7gm

Given mass of Ni = 1.25gm

Avogadro’s No. = 6.022 × 10²³ atom/mole

                    Moles of Ni = Given mass/Molecular mass

                                          = 1.25/58.7 = 0.0213

                    Moles of Ni = 0.0213

Now ,

       Number of Ni atom = Avogadro’s number × Moles

So that,

                No. of Ni atom = 6.022 × 10²³× 0.0213

                                            = 0.128 ×10²³  atoms

                                           = 1.28 × 10²² atoms

                                           = 1.28e22

So there are 1.28 × 10²² individual Ni atoms are contained in 1.25 grams of Ni.

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In photosynthesis, plants use energy from the sun to produce glucose, c6h12o6 , and oxygen from the reaction of carbon dioxide and water.
6co2 + 6h2o --> c6h12o6 + 6o2
what mass, in grams, of glucose is produced when 3.00 mol of water react with carbon dioxide?

Answers

Answer: 324 g (to 3 sf)

Explanation:

Based on the coefficients of the equation, we know that when 3.00 mol of water is consumed, 3.00 mol of carbon dioxide is also consumed.

The atomic mass of carbon is 12.011 g/mol.The atomic mass of oxygen is 15.9994 g/mol.

Thus, the formula mass of carbon dioxide is:

[tex]6(15.9994)+12.011=108.0074[/tex] g/mol.

Thus, 3.00 mol has a mass of (108.0074)(3.00)=324 g (to 3 sf)

2. four bulbs connoted in parallel controlled by a single pole switch using
alternating current

Answers

Answer

I think there should be two poles, a north pole and a south pole. so this statement is wrong

Hydrogen and Oxygen will have ______ properties after they bond to become water.
A. only the dominant element’s
B. both of their original
C. the same
D. completely new

Answers

Hydrogen and oxygen will have completely new properties

A sample of gas collected at 685 mm Hg occupies 131 mL. At constant temperature, what pressure does the gas exert if the volume increases to 478 mL? a. 188 b. 1320 c. 128 d. -88.8

Answers

Answer:

a.  P=188mmHg

Explanation:

A gas undergoing a change of volume and pressure at constant temperature (and not changing the number of molecules), follows Boyle's Law:  [tex]P_1V_1=P_2V_2[/tex]

The units of these quantities can be any measure of pressure and volume, so long as long as the units are the same between beginning and ending conditions.

Substitute and solve:

[tex]P_1V_1=P_2V_2[/tex]

[tex](685[mmHg])(131[mL])=P_2(478[mL])[/tex]

[tex]\dfrac{(685[mmHg])(131[mL\!\!\!\!\!\!\!\!\!{--}])}{478[mL\!\!\!\!\!\!\!\!\!{--}]}=\dfrac{P_2(478[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}{478[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}[/tex]

[tex]187.730125523[mmHg]=P_2[/tex]

Accounting for significant figures, [tex]P_2=188[mmHg][/tex]

An exergonic reaction __________ free energy, and an endergonic reaction __________ free energy.

Answers

Answer:

An exergonic reaction releases free energy, and an endergonic reaction absorbs free energy.

Explanation:

hope it helps

1s22s²2p63s23p64s²3d104p5
Which element is this?

Answers

Answer: bromine

Explanation:

There are a total of 2+2+6+2+6+2+10+5=35 electrons, meaning there are 35 protons. The element with atomic number 35 is bromine

Compare
Ion and Radical
Atom and molecule
Organic and inorganic compounds

Answers

Answer:

'An ion has a non-zero electric charge. A radical has an atom with unfilled electron shells and so is very reactive, but is electrically neutral.'

'Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.'

'The primary difference that lies between these organic compounds and inorganic compounds is that organic compounds always have a carbon atom while most of the inorganic compounds do not contain the carbon atom in them.'

Organic and inorganic compounds:

Similarities:::---

1) In both organic and inorganic compound, the elements joining in making compound complete their octet.

2) Organic compound shows isomerism (R/S , E/Z , cis/trans, enantiomers, diastereomers, etc), just as inorganic compound do (Δ/Λ, enantiomers, R/S enantiomers, cis/trans, fac/mer isomers, etc).

3) Organic compound and inorganic compounds can be very active in chemical reactions, e.g. organolithium reagents could be flammable or even pyrophoric (generally stored under 10°C), while inorganic reagents like in this paper are quite rapid...

Differences:::---

1) Organic compound are very long in size so they can make polymer but inorganic compound are not very long but its structure might me complex.

2) The boiling,melting point of organic compound is lass than inorganic compound.

3) Organic compound always contains carbon but inorganic compounds might not.

4) Organic compound

_____________________________

Ion and Radical Atoms:

In some sense they are a bit similar. The main difference is that a neutral radical has no charge imbalance between the protons and electrons, but the cation or anion does.

Ions are written with an explicit charge because of that charge imbalance, but radicals may or may not have an imbalance of charge. Just because a molecule is a radical doesn't mean it's neutral.

For example, if you shoot 2-pentanone with an electron beam for Electron "Impact" Mass Spectroscopy, where you essentially study molecules whose structures break into smaller pieces as a result of interacting with stray electrons to identify the molecules, you get a cationic radical (middle, or far right of the following diagram).

How many atoms are present in 2.1 moles of Fe

Answers

Answer:

1.3 x 10²⁴ atoms Fe

Explanation:

To convert moles to atoms, you need to multiply your given value by Avogadro's Number. This causes the conversion to occur because Avogadro's Number exists as a ratio. It is the ratio that allows for the cancellation of units during multiplication. This is why atoms should be in the numerator of your conversion. The final answer should have 2 sig figs to reflect the given value.

Avogadro's Number:

1 mole = 6.022 x 10²³ atoms

2.1 moles Fe          6.022 x 10²³ atoms
---------------------  x  -------------------------------  =  1.3 x 10²⁴ atoms Fe
                                        1 mole

There are 4.9875 mol C, 7.9802 mol H,
and 2.00 mol O in the sample.
Divide each by the smallest number of
moles. What is the ratio for the H?

Answers

did anyone able to look up this question

the ratio for the H is 3.9901

What is the major different between the particles in a liquid and a gas of the same substance at the same temperature?
a. The particles in the gas are moving faster than the particles in the liquid
b. The particles in a liquid are still connected, but the particles in a gas have separated from each other and now fly around to fill the container
c. The particles in the liquid have higher masses than the particles in the gas
d. The particles the gas are separated, so they absorb less heat than normal, which is why gases are typically cooler than liquids

Answers

Answer: a. The particles in the gas are moving faster than the particles in the liquid

The molecular structure of water has an asymmetrical arrangement of hydrogen atoms causing.

Answers

Answer:

the asymmetrical arrangement of hydrogen atoms in a molecule of water causes the molecule to be polar, with the hydrogen atoms having a slightly positive charge, and the oxygen atom having a slightly negative charge.

A 1. 07 g sample of a noble gas occupies a volume of 363 ml at 35°c and 678 mmhg. Identify the noble gas in this sample. (r = 0. 08206 l×atm/k×mol)

Answers

The identity of the noble gas is the sample is Krypton

Ideal Gas law

From the question, we are to determine the identity of the noble gas in the sample

From the ideal gas equation, we have that

PV = nRT

∴ n = PV / RT

Where P is the pressure

V is the volume

n is the number of moles

R is the gas constant

and T is the temperature

From the given information,

P = 678 mmHg = 0.892105 atm

V = 363 mL = 0.363 L

R = 0.08206 L.atm/mol.K

T = 35 °C = 35 + 273.15 K = 308.15 K

Putting the parameters into the equation, we get

n = (0.892105 × 0.363)/ (0.08206 × 308.15)

n = 0.0128 moles

Now, we will determine the Atomic mass of the sample

Using the formula,

Atomic = Mass / Number of moles

Atomic mass of the substance = 1.07 / 0.0128

Atomic mass of the substance = 83.6 amu

The noble gas with the closest atomic mass to this value is Krypton.

Molar mass of Krypton = 83.798 amu

Hence, the identity of the noble gas is the sample is Krypton

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You mass two substances. One substance has a mass of 22.45 g and the other has a mass of 3.1 g. What is the total mass of both objects?

Answers

Answer:

25.55 g

Explanation:

To find the total mass of both objects, you need to add the masses together.

22.45 g + 3.1 g = 25.55 g

In correct significant figures (2 sig figs to match 3.1 g), the value would be 26 g.

Answer:

answer = 25.55

Explanation:

You just have to add the mass of the two objects

It is the year 2040, and you are a research scientist. The amount of sunlight that reaches the earth has been drastically reduced due to a major event like pollution, fires, or volcanoes. Farmers are asking you for help to save their failing crops.

Answers

hhfgbuugucviibygtvhgyvybubbiinubuvycyuj

What is an example of climate?

Answers

Answer:

Tropical.

Dry.

Temperate.Continental.Polar.

Explanation:

The tropical climate in the Köppen system is defined as having an average temperature in every month of above 18°C. There is no winter season, and annual rainfall is large and exceeds the annual evaporation.

The dry climate regions are characterized by evaporation surpassing the humidity of precipitation. It is represented with the letter "B" in the Köppen climate classification. Precipitation is infrequent and vegetation is scarce in these areas.

Temperate climates are generally defined as environments with moderate rainfall spread across the year or portion of the year with sporadic drought, mild to warm summers and cool to cold winters.

A relatively dry climate with very hot summers and very cold winters, characteristic of the central parts of Asia and North America.

A polar climate consists of cool summers and very cold winters, which results in treeless tundra, glaciers, or a permanent or semi-permanent layer of ice. It is identified with the letter E in the Köppen climate classification.

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0. 820 mole of hydrogen gas has a volume of 2. 00 l at a certain temperature and pressure. What is the volume of 0. 125 mol of this gas at the same temperature and pressure?

Answers

The volume of 0.125 mole of the gas at the same temperature and pressure 0.30 L

Data obtained from the question Initial mole (n₁) = 0.82 moleInitial volume (V₁) = 2 LNew mole (n₂) = 0.125 molePressure = ConstantTemperature = ConstantNew Volume (V₂) =?

How to determine the new volume

The new volume can be obtained as illustrated below

PV = nRT

Divide both side by P

V = nRT / P

Divide both side by n

V / n = RT / P = Constant

Thus,

V₁ / n₁ = V₂ / n₂

2 / 0.82 = V₂ / 0.125

Cross multiply

0.82 × V₂ = 2 × 0.125

Divide both side by 0.82

V₂ = (2 × 0.125) / 0.82

V₂ = 0.30 L

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Kate stepped into the room and everyone immediately began to cheer. She knew this was the greatest feeling she would ever experience. Write a story which includes these sentences. please help > Capital structure of a firm which of the following statements is true of equity financing less risky than deft financing. Requires forms to agree to burdensome covenants Less flexible then debt financing x2 + y2 + 42x + 38y 47 = 0. The equation of this circle in standard form is What are the solutions to the quadratic equation below in factored form?(2x - 1)(3x + 4) = 0Ox= 1/12, XOx=121X =340x = -1/, x=-1Ox= = 1/, x = -1/32 In a time when few people considered Native Americans to be worthy of equal rights, Chief Justice John Marshall was willing to stand up for the Native Americans. In the Worcester v. Georgia case, the Cherokee asked the Supreme Court to stop the state of Georgia from enforcing its laws on the Cherokee's land. In 1832, Marshall ruled that the government of Georgia did not have the right to enforce its laws on Cherokee lands. This ruling allowed Cherokees to stay on their homeland.From the passage, one can see that Chief Justice John Marshall used his authority to A. end much of the prejudice against Native Americans. B. create a treaty between whites and Cherokees. C. help Native Americans gain some rights. D. stop all of the Native Americans' problems. PLEASE HELP (not good at math) Which excerpt from I Know Why the Caged Bird Sings best justifies the inference that Bailey is a supportive brother to Marguerite? Which of the following is the difference of two squares?A. 100m^2+9n^2B.9x^2-12y^2C. 16g-49hD. 25a^2-36b^6 Two number cubes are rolled for two separate events:Event A is the eventthat the sum of numbers onboth cubes is less than 10.Event B is the event that the sum of numbers on both cubes is a multiple of 3.Complete the conditional-probability formula forevent B given that event A occurs first by writing A and B in the blanks: Parallelogram ABCD is adjacent to rhombus DEFG, as shown below, and F C intersects A D at H. image If m B = 126 and m A H C = 142 , determine and state m G F H . In an effort to duplicate the stressors involved with working at a large company, researchers go to great effort to ensure that the stressor they use and the laboratory setting they create is similar in all respects (e.g., noise, temperature, room setup) to that of a major multinational corporation. The researchers are attempting to increase: Helppppp!!!!!! Find m The residence time for the average water molecule in that water tank is seconds. Kevin is looking at two brands of washing machines. Between water and electricity, a Brand C washer uses about $0.65 per load, and a Brand D washer uses about $0.27 per load. Kevin averages about five loads of laundry per month. After one year, how much more would the utility costs for a Brand C washer be than the utility costs for a Brand D washer Because of Supreme Court decisions that invalidated New Deal programs, in 1937 President Roosevelt put forth a plan to increase the number of justices in order to swing the Court to his side. How was this situation resolved State the value of 'x' in this equation, and explain why you know this to be true without doing any calculations.[tex]5^x = 5^9[/tex] which expressions are equivalent ?? Select the correct answer from each drop-down menu.Scientific theories are always testable. A theory may be changed as a result of . Question 1:Listed below are some items found in the financial statements of ABC Bhd. (a) Service revenue (b) Trade receivables (c) Equipment (d) Effect of exchange rate (e) Cash and cash equivalent (f) Inventories (g) Fixed deposits (h) Depreciation (i) Net book value (j) Repayment of loans (k) Advertising expense (l) Dividends (m) Retained earnings (n) Salaries and wages payables (0) Finance costs (p) Taxation expenses (q) Total comprehensive income (r) Issuance of shares (s) Proceeds from disposal of plant (t) Bank Required: Indicate in which financial statements the above items would appear. Drag each tile to the correect location on the table. Not all tiles will be used. Maych each quadratic function with the attributes of its graph.