The diagram below shows atoms that are all arranged into groups in the same way.


What does this diagram represent?

A.) two different substances

B.) three different substances

C.) a single type of substance

D.) a single type of element

Answer:

The correct answer is: 6.6 g MgO

Explanation:

First we have to write and balance the chemical reaction as follows:

2Mg(s) + O₂(g) → 2MgO(s)

That means that 2 moles of Mg(s) react with 1 mol of O₂(g) to give 2 moles of MgO(s). If Mg is totally consumed and a mass of O₂ remains unaltered after reaction, the limiting reactant is Mg. We use the limiting reactant to calculate the mass of product.

According to the balanced chemical equation, 2 moles of Mg(s) produce 2 moles of MgO(s).

2 moles Mg = 2 mol x molar mas Mg= 2 mol  x 24.3 g/mol = 48.6 g Mg

2 moles MgO= 2 mol x (molar mass Mg + molar mass O) = 2 mol x (24.3 g/mol + 16 g/mol) = 80.6 g MgO

The stoichiometric ratio is 80.6 g MgO/48.6 g Mg. So, we multiply this ratio by the mass of consumed Mg (4.0 g) in order to obtain the produced mass of MgO:

4.0 g Mg x 80.6 g MgO/48.6 g Mg = 6.63 g MgO

6.6 grams of magnesium oxide are formed.

Acetic acid will be produced by diazotizing ethylamine with HNO2 and then hydrolyzing it. Tetrahedral intermediate I is produced as the hydrocarbon part(R) of alcohol increases.

when they become increasingly crowded during esterification, which causes a corresponding decline in the esterification rate. Therefore, CH3OH C H 3 O H, the smallest alcohol, interacts at the rate that is the fastest. The process of water acting as a base to dissolve a weak acid was described to us as "acidic hydrolysis." A hydronium ion, for instance, can be created when acetic acid and water mix. The body can then receive energy from this hydronium ion through reactions with other substances, such as ATP.

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Answer:

Explanation:

We can solve this using Gay Lussac's law which states that the pressure of a given mass of gas is directly proportional to it's temperature in kelvin. This law can be illustrated using the formula below

P₁/T₁ = P₂/T₂

where P₁ = 101.3 kPa

P₂ = 191.0 kPa

T₁ = 373.15K

T₂ = ?

101.3/373.15 = 191/T₂

cross-multiply

T₂ = 373.15 x 191/101.3

T₂ = 703.57K

The temperature of the steam inside the pressure cooker is 703.57K

The temperature is  703.6 K.

The pressure of a given mass of gas is directly proportional to its  temperature at constant volume.

P1 = 101.3 kPa

P2 = 191.0 kPa

T1 = 373.15K

T2 = ?

Now;

P1/T1 = P2/T2

P1T2 = P2T1

T2 = P2T1/P1

T2 = 191.0 kPa × 373.15K/101.3 kPa

T2 = 703.6 K

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No it’s not balanced. The Na are not balanced (option A)

the given chemical equation is not balanced because It is missing some coefficients to balance the number of atoms on both sides of the equation.

The balanced chemical equation for the reaction is:

Na2SO4 + Mg(OH)2 → MgSO4 + 2NaOH

This equation shows that two molecules of sodium hydroxide (NaOH) are produced for every one molecule of magnesium hydroxide (Mg(OH)2) consumed, and that the number of sodium (Na) atoms is balanced on both sides of the equation.

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The mass of product that will form is calculated as 10.3 g.

Molar mass of a chemical compound is the ratio between the mass and the amount of substance of any sample.

4Fe + 3O₂ -> 2Fe₂O₃

The stoichiometric ratio of Fe to O₂ in the balanced equation is 4:3. This means that for every 4 moles of Fe, we need 3 moles of O₂ to react completely. If we have more Fe than O₂, then O₂ is the limiting reactant. If we have more O₂ than Fe, then Fe is the limiting reactant.

Moles of Fe = 6.3 g / 55.85 g/mol = 0.113 mol

Moles of O₂ = 3.1 g / 32 g/mol = 0.097 mol

From this, we can see that O₂ is the limiting reactant since we have fewer moles of O₂ than Fe.

To calculate the amount of product formed, we can use the stoichiometric ratio of Fe₂O₃ to O₂, which is 2:3. This means that for every 3 moles of O₂, we can produce 2 moles of Fe₂O₃. Since we have 0.097 moles of O₂, we can produce:

mass of 4 moles of Fe = 223.2 g

molar mass of Fe₂O₃ = 159.6 g/mol

mass of 2 moles of O₂ = 319.2 g.

Then, mass of Fe₂O₃ produced from 6.3 g of Fe is:

( 6.3 × 319.2)/223.2 = 9 g.

0.097 mol O₂ x (2 mol Fe₂O₃ / 3 mol O₂) x (159.69 g/mol Fe₂O₃) = 10.3 g Fe₂O₃

Therefore, the mass of product that will form is 10.3 g.

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Answer:

18.1 g

Explanation:

Step 1: Write the balanced equation

CaO + 3 C ⇒ CaC₂ + CO

Step 2: Calculate the moles corresponding to 10.2 g of C

The molar mass of C is 12.01 g/mol.

10.2 g × 1 mol/12.01 g = 0.849 mol

Step 3: Calculate the moles of CaC₂ produced from 0.849 moles of C

The molar ratio of C to CaC₂ is 3:1. The moles of CaC₂ produced are 1/3 × 0.849 mol = 0.283 mol

Step 4: Calculate the mass corresponding to 0.283 moles of CaC₂

The molar mass of CaC₂ is 64.10 g/mol.

0.283 mol × 64.10 g/mol = 18.1 g

6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

Specific heat of copper = 0.385 J/(gi°C)

Explanation:

Given:

Mass of copper (m) = 200 g =

Initial temperature (T1) = 20°C

Final temperature (T2) = 40°C

Heat needed (Q) = 1,540 J

Find:

Specific heat of copper = ?

Computation:

⇒ Change in temperature (ΔT) = T2 - T1

⇒ Change in temperature (ΔT) = 40°C - 20°C

⇒ Change in temperature (ΔT) = 20°C

⇒ Specific heat of copper = Q / [mΔT]

⇒ Specific heat of copper = 1,540 / [(200)(20)]

Specific heat of copper = 0.385 J/(gi°C)

Answer:

0.385 j/g* degrees Celsius

Explanation:

I took the quiz

The halogens are the elements of the 17th group of the periodic table, from the given choices, the elements that belong to this group are Fluorine and Chlorine.

26.8L is the volume, in liters, of 1.20 mol of C\(_3\)H\(_8\) gas at STP. A measurement of three-dimensional space is volume.

A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, like the cubic metre or litre, or different imperial or US-standard units, including the gallon, quart and cubic inch. Volume and length (cubed) have a symbiotic relationship.

The volume of an envelope is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the quantity of fluid (liquid or gas) that the container may hold.

Volume = 1.20×22.4

              =26.8L

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Answer:

D. Entropy is the measure of randomness

Explanation:

I got it right so I don't know if it's going to be right for you. All questions/answers are not the same but since I personally got it right then I wanted to help you out! I apologize if I'm late/wrong! God bless you guys!

Answer:

Entropy is a measure of randomness.

Explanation:

i just took the test on a pex.

Answer:

In an acid-base reaction, the base always receives the H+.

Explanation:

This technique has been used to identify the presence of gases such as oxygen, methane, and carbon dioxide in the atmospheres of exoplanets.  

i) To estimate the frequency of the violet (leftmost) emission, we can use the equation v = c/λ, where v is frequency, c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the emission in meters. The wavelength of the violet emission is 400 nm or 400 x 10^-9 m, so the frequency can be calculated as v = (3.00 x 10^8 m/s) / (400 x 10^-9 m) = 7.50 x 10^14 Hz.

ii) To estimate the energy of the violet emission, we can use the equation E = hv, where E is energy, h is Planck's constant (6.63 x 10^-34 Js), and v is frequency in Hz. Substituting the frequency calculated in part (i), we get E = (6.63 x 10^-34 Js) x (7.50 x 10^14 Hz) = 4.97 x 10^-19 J.

b. The spectral lines are produced by the electrons within the atoms of this element, which can absorb or emit specific amounts of energy to move between different energy levels. These energy transitions result in the emission or absorption of photons with specific wavelengths and frequencies, giving rise to the observed emission spectrum.

c. The violet emission line represents the photon with the most energy since it has the shortest wavelength (400 nm) and highest frequency (7.50 x 10^14 Hz) among the lines shown. This highest energy does not necessarily represent the energy of the valence electrons, but rather corresponds to the specific energy transitions occurring within the atoms of the element.

d. Emission spectra can be used to determine the gases present in the atmosphere of a far-away planet by analyzing the specific wavelengths of the emitted or absorbed light from the planet. Each gas has a unique emission or absorption spectrum, allowing scientists to identify the gases present in the planet's atmosphere.

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First thing we need to do is identify this element, with the number of protons we can use it to predict which element it is, since number of protons is equal to the atomic number of an atom, therefore this atom has 74 protons and 74 of atomic number, this is the atom Tungsten (chemical symbol W). Now, tungsten is in a position of the periodic table in which it is not easily possible to precit its ionic charge, as almost all transition elements, but some experimental charts give us the information that W has a +6 charge, this means that in a ionic form, Tungsten will have 68 electrons

The states of matter are solid, liquid, gas, and plasma.

Addition of heat to a substance helps the molecules break the intermolecular forces of attraction.

Elements are pure substances consisting of same type of atoms while Compounds are pure substances consisting of two or more different atoms.

The states of matter are four types namely:

Addition of heat to a substance results in phase change as the heat added to the substance helps the molecules break the intermolecular forces of attraction.

Elements are pure substances consisting of entirely the same type of atoms, for example hydrogen.

Compounds are pure substances consisting of two or more different atoms, for example water.

A pure (hom0genous) substance consists of one more elements chemically joined together while mixtures consists of two or more substances physically joined together.

Physical changes are changes that can be easily reversed such as the melting of candle wax while chemical changes are changes that cannot be easily reversed such as rusting of iron.

The modern atomic theory is the theory that atoms consists of the three fundamental particles; electrons, protons and neutrons.

Democritus stated that all matter consists of atoms which are extremely small and indestructible.

Dalton stated that all elements consists of small indivisible particles called atoms and that atoms of the same element were alike in all respects.

Atoms consists of electrons which are found in energy levels or orbits around the nucleus where the protons and neutrons are found.

Isotopes are atoms of the same element having different masses.

Atomic number of an element is the number of protons in the atom while the mass number is the sum of protons and neutrons in the atom.

The period table of elements is arranged in increasing order of atomic number of elements into groups and periods.

In conclusion, matter is the main component of materials and it exists in four different states.

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Answer:

C6H12O6

Explanation:

C6H12O6

To measure reaction heat under isochoric conditions, a bomb calorimeter is needed.

This device is designed to maintain a constant volume (isochoric) during the reaction, allowing for accurate measurement of reaction heat. To improve the accuracy of the coffee cup calorimeter for measuring reaction heat under isobaric conditions, a modification that could be made is to use a stirring device to ensure uniform mixing of the reactants and to minimize heat loss to the surroundings.

Additionally, a lid with a small hole could be placed over the top of the calorimeter to prevent heat loss while still allowing for pressure equalization. These modifications would help to minimize errors in heat measurement and improve the accuracy of the results obtained.

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Answer:

The continents are, from largest to smallest: Asia, Africa, North America, South America, Antarctica, Europe, and Australia.

Explanation:

There ya go Hope this helped

Answer:

Axel: Much of the water is in the air around us.

Explanation:

When a puddle of water forms on the ground, it indicates that much of the ground around it is saturated with water and as such, the water would not readily soak into the ground. Also, since the puddle was found in a park, it is not likely that the water has gone into a stream, river, pond, lake, or ocean.

Since, the day was a sunny, it means that the heat from the sun has caused the evaporation of the water molecules. However, the water vapor molecules do not just immediately rise up to the atmosphere to form clouds nor do they cease to exist, rather it is dispersed in the air around the surroundings and beyond. Formation of clouds by water vapor takes days to happen.

Also, the water has not changed to fog either as they form usually at cooler temperatures.

Answer:

A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.

Explanation:

The distance can be calculated using the formula: d = v * t, where d is the distance, v is the speed of sound (330 m/s), and t is the time elapsed (5 seconds).

So, the distance is: 330 m/s * 5 s = 1650 meters.

We can apply the concept of heat transmission to determine the water's final temperature. The heat acquired by the water offsets the heat lost by the metal.

Given: 200 g for the mass of water (m).

Water's initial temperature (T1) is 50 °C.

(Q) = 8400 J of heat is transferred from metal to water.

Water has a specific heat capacity (C) of 4.18 J/(g°C).

The following formula can be used to determine the heat transferred:

Q = m * C * ΔT

We may calculate the temperature change (T) by rearranging the equations as follows:

ΔT = Q / (m * C)

replacing the specified values:

T is equal to 8400 J / (200. g * 4.18 J/(g°C))

ΔT ≈ 10.048 °C

We multiply the original temperature by the temperature change to obtain the final temperature (T2):

T2 = T1 + T + 10.048 °C T2 = 50 °C + 10.048 °C

T2 ≈ 60.048 °C

As a result, the water's final temperature is around 60.048 °C.

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Answer:

H3PO4 + 3NaOH ----> Na3PO4 + 3H2O

Explanation:

The balanced equation is given below

H3PO4 + 3NaOH ----> Na3PO4 + 3H2O

Answer:

\(H_3PO_4 (aq) + 3NaOH (aq) \rightarrow 3H_2O (l) + Na_3PO_4 (aq)\)

Explanation:

Hello,

In this case, for the given reaction:

\(H_3PO_4 (aq) + NaOH (aq) \rightarrow H_2O (l) + Na_3PO_4 (aq)\)

We must assure the law of conservation of mass is respected, so we equal the number of atoms at each side of the equation by adding the stoichiometric coefficients to the left of each compound as shown below:

\(H_3PO_4 (aq) + 3NaOH (aq) \rightarrow 3H_2O (l) + Na_3PO_4 (aq)\)

So the coefficients are 1, 3, 3 and 1 respectively for each species in the chemical reaction.

Regards.

Answer:

1027.9 mL, its easy

Explanation:

2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams. Density is the mass of a specific material per unit volume.

Density is the mass of a specific material per unit volume. Density is defined as d = M/V, in which d represents density, M is weight, as well as V is volume. Density is generally expressed in grams every cubic centimetre. Water, for example, has a density of 1 gram per square centimeter, but Earth has a density of 5.51 kilograms per cubic centimetre.

Density is sometimes measured in kilos per cubic centimeter (in metre-kilogram-second or SI units). The density of air, for example, is 1.2 kilos per cubic metre. 

density = mass / volume

            =53/ 20

            =2.65g/ml

Therefore, 2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams.

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Answer:

The date when the animal was buried can be estimated by using the decay rate of Carbon-14. The half-life of Carbon-14 is 5,730 years, so the date when the animal was buried can be estimated by taking the half-life and multiplying it by the logarithm of the ratio of the 14C/12C ratio of the bone and the 14C/12C ratio of a living plant or animal. In this case, 5,730 years x log(0.477) = 45,906 years ago.

Explanation:

Answer:

THE MOLECULAR FORMULA FOR THE COMPOUND IS C2 Cl2

Explanation:

mass = 0.04380 g

Volume = 10 mL = 10 / 1000 L = 0.010 L

Pressure = 1.10 atm

R = 0.082 L atm mol^-1 K^-1

Temperature = 290.5 K

Carbon = 25.305 %

Chlorine = 74.695 %

Atomic mass of carbon = 12

Atomic mass of chlorine = 35.5

First calculate the empirical formula by following these steps:

1. Write the percentage composition of the elements involved and divide by its atomic mass

Carbon = 25.305 / 12 = 2.10875

Chlorine = 74.695 /35.5 = 2.1040

2. Divide each by the smaller value

Carbon = 2.10875 / 2.1040 = 1.002

Chlorine = 2.1040 / 2.1040 = 1

3. Round up to the whole number

The empirical formula is C Cl

Next is to calculate the molar mass of the compound using ideal gas equation

PV = mRT/ MM

Mm = mRT / PV

Mm = 0.04380 * 0.082 * 290.5 / 1.10 * 0.010

Mm = 1.0433 / 0.011

Mm = 94.845 g/mol

Mm = 94.85 g/mol

Now that we know the molar mass, we can go on to calculate the molecular formula:

(C Cl) n = Molar mass

( 12 + 35.5) n = 94.85

(47.5)n = 94.85

n = 94.85 / 47.5

n = 1.9968

n ~ 2

The molecular formula can then be written as C2Cl2.