a mixture of caco₃ and cao has a mass of 2.500 g. after heating, the mass of the sample is reduced to 2.016 g. what is the mass percent of caco₃ in the mixture? caco₃(s) → cao(s) co₂(g)

The ideal gas equation can be used to determine the molar mass of the substance with the help of the moles. The molar mass of the gas having a mass of 0.458 grams is 9.15g/mol.

Ideal gas law gave the relation between the moles, pressure, temperature, volume, and the gas constant. The moles of the ideal hypothetical gas can be used to calculate the molar mass.

An ideal gas equation is given as:

PV =nRT

Given,

Mass = 0.458 gm

Pressure (P) = 0.98 atm

Volume (V) = 1.2 L

Temperature (T) = 287 K

Gas constant (R) = 0.0821

Substituting values in ideal gas as:

0.98 × 1.2 = n × 0.0821 × 287

n = 1.18 ÷ 23.56

n = 0.05moles

Now, moles are used to calculate molar mass as:

molar mass = mass ÷ moles

= 0.458 ÷ 0.05

= 9.15g/mol

Therefore, 9.15g/mol is the molar mass of the unknown gas.

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Taking into account the definition of atomic number and mass number, the three true statements are:

All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).

The atomic number of a chemical element is the total number of protons that each atom of that element has.

Atoms in nature are electrically neutral, so the number of positive and negative particles is the same. That is, in an atom that has no charge, the atomic number also indicates the number of electrons.

The mass number indicates the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:

Mass number = (number of protons) + (number of neutrons)

So, If you know the number of protons and the mass number, the number of neutrons can be calculated as:

Number of neutrons= mass number - number of protons

Considering the definition of atomic and mass number, you can know:

Finally, the three true statements are:

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Chemical Formula : It is the method of showing the information about the chemical proportion of atoms of a given element.

Types of Chemical Formula : There are three types namely

1. Molecular

2. Empirical

3. Structural

a.  The chemical formula of the given compound asked in the problem are :

i. Copper (II) oxide - CuO

ii. Iron (III) Carbonate - Fe2(CO3)3

iii. Magnesium Sulphate - MgSO4

b. The proportion by mass of the given compound are :

i. CuO = Atomic mass of copper and oxygen are = 64 and 16

so, mass proportion = 64 / 16 = 4 : 1

ii. Iron Carbonate :  = 14 :1

iii. Magnesium Suphate - 24 / 32 = 3:4

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From the question, the point at which the heating curve does plateau is the boiling point of water.

The heating curve is used tool that we use to see how the temperature change by the addition of heat affects the state of matter in which the material is obtained. The vertical axis could be used to plot the temperature while the horizontal axis could be used to plot the changes in the state of matter.

There are three states of matter namely;

Liquid

Solid

Gas

Water can be able to exist in all the states of matter that have been mentioned but there is a temperature range at which each state of matter can be observed. Thus we have the solid range, liquid range and the gaseous range of water.

Looking at the graph, when we begin to heat the water, the water is liquid at the start but the temperature increases rapidly. This increase would continue until the temperature  of the water begins to plateau. The point of plateau is the boiling point of water.

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This state at a specific temperature is called phase change.

For example, evaporization is phase change process in which the water changes from a liquid to a gas (water vapor).

Other example, condensation is phase change process in which the water changes from a gas to a liquid.

Heating curve of water show how the temperature changes as water is heated up. A heating curve for water that shows transition zones (see the picture below).

The first phase change is melting, the temperature stays the same while an ice melts.

The second phase change is boiling, the temperature stays the same while a water boils.

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Answer:

Explanation:

The isotope Al-27 has 13 protons and 14 neutrons. Aluminium's average atomic mass is 26.981539 AMU

Answer:

Entropy generally increases when a reaction produces more molecules than it started with.

Explanation:

a. The jigsaw puzzle is taken apart and put back in the box.  entropy decreases

b. Clothes are folded and put away. entropy decreases

c. Ice turns into steam​. entropy increases

Entropy is the measurement of the amount of heat energy per unit of temperature in a system that cannot be used for productive labor. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.

Entropy theory offers profound understanding of both the direction underlying spontaneous development for many commonplace events.

a. The jigsaw puzzle is taken apart and put back in the box.  entropy decreases

b. Clothes are folded and put away. entropy decreases

c. Ice turns into steam​. entropy increases

Therefore,

a. The jigsaw puzzle is taken apart and put back in the box.  entropy decreases

b. Clothes are folded and put away. entropy decreases

c. Ice turns into steam​. entropy increases

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Answer: 2(B)

Explanation: It's a little confusing to read but from my understanding it's 2 because the atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons

When looking for a mathematical relationship between two variables use a line graph.

A mathematical variable is one that can be found by the use of algebra or by a the use of graph. We know that a line graph involves plotting the independent variable on the horizontal axis and the dependent variable on the vertical axis.

The relationship between the two variables can be determined by studying how much the data set suits a particular equation of line of best fit or by considering the correlation coefficient of the scatter plot.

Hence, when looking for a mathematical relationship between two variables use a line graph.

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Missing parts;

When looking for a mathematical relationship between two variables, use a _____.

A. line graph

B. circle graph

C. bar graph

D. data table

A covalent bond is likely to be polar when one of the atoms sharing electrons is more electronegative than the other atom.

When the electronegativity difference is greater, the bond polarity is increasing.

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.

Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.

For example, water (H₂O) is a polar molecule. Atom of oxygen has higher electronegativity and negative charge, while atom of hydrogen has lower electronegativity and positive charge. Atoms of hydrogen and oxygen are connected by polar covalent bonds.

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The distance between the two points ( 8 , − 5 ) and ( 1 , 1 ) is determined as 9.2 units.

The distance between two points is calculated using the following equation.

for a given points (x1, y1), (x2, y2), the distance, d is;

d = √[(x2-x1)² + (y2 - y1)²]

From the given question;

x1 = 8, y1 = -5

x2 = 1, y2 = 1

distance = √[(1-8)² + (1 - -5)²]

distance = √[(-7)² + (16)²]

distance = 9.22 units

Thus, the distance between the two points ( 8 , − 5 ) and ( 1 , 1 ) is determined as 9.2 units.

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Answer:

Determine the weight of an object. For example, a glass of water weights 200 grams net (not including the glass).

Find out the volume of an object. In our example, it's 200 cm3 .

Divide weight by volume. 200 g / 200 cm3 = 1 g/cm3

Optionally, change the unit.

Explanation:

The metals are malleable and ductile, which means that they can be beaten into sheets and can be given any desired shape while the nonmetals are brittle and soft. Metallic elements are considered as good conductors of electricity and heat while nonmetallic elements are poor conductors. Metals are lustrous while nonmetals are nonlustrous.

A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically ductile (can be drawn into wires) and malleable (they can be hammered into thin sheets).

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Sodium has more protons, neutrons, and electrons than Lithium.

The nuclei of atoms consist of protons and neutrons. Both component form the bulk of the mass of atoms.

Outside the nucleus, electrons are found in the orbitals surrounding the nucleus.

The atomic number of an atom is the number of protons in the nucleus of the atom. For neutral atoms, the number of protons and electrons is the same.

The atomic number of Lithium is 2, while that of Sodium is 11. This means Lithium has 2 protons while sodium has 11.

The atomic mass of Lithium is 7 while that of sodium is 23. This means that sodium has more neutrons than lithium.

Thus, sodium has more neutrons, electrons, and protons, than lithium.

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The empirical formula of the compound is CH₃

The empirical formula is determined as follows:

Given the general equation of the combustion of hydrocarbons as follows:

CxHy + O₂ → x CO₂ + y H₂O

mass of CO₂ produced = 3.54 g

molar mass of CO₂ = 44 g/mol

moles of C in the sample = 3.54/44  = 0.08 moles

molar mass of C = 12 g/mol

mass of C in the sample =  0.08  * 12 = 0.96 g

mass of H₂O produced  = 1.09 g

molar mass of water = 18 g/mol

moles of H in the sample = 1.09 /18  * 2

moles of H in the sample = 0.12 moles

Ratio of C : H = 0.08 : 0.12

Ratio of C : H = 1 : 3

Therefore, the empirical formula of compound = CH₃

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Answer:

A

Explanation:

eg digestive system consists of ma y organs working towarss the break down of large insoluble food molecules

Answer:

A is the answer

Explanation:

When cytosine reacts with NaNO2 and HCl to form Diazonium salt.

Diazonium salt or diazonium compounds are defined as the group of the organic compounds which sharing a common functional group [R−N⁺≡N]X⁻ where R is any organic group, like an alkyl or an aryl, and X can be an organic or inorganic anion, like a halide.

As we know that, Cytosine is a 6 membered ring consisting of

Thus, we concluded that the cytosine reacts with NaNO2 and HCl to form Diazonium salt.

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The balanced chemical equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide is :

                     FE2O3 + 3CO → 2FE +3CO2

Two moles of iron with three moles of carbon dioxide gas are produced when one mole of iron(iii) oxide reacts with three moles of carbon monoxide

A balanced chemical equation is defined as the number of atoms of each type in the reaction being equal to the reactants and product sides.

The mass and charge is equal in a balanced chemical reaction.

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cell is a basic unit of all living things.

Explanation:

because all the metabolic activities performed by the body are outcome of cellular activities

Pyramid of energy has not an advantage: B. Assigning the decomposers and detritivores to a particular trophic level.

Pyramid of energy is a graphical representation of the amount of energy at each trophic level of a food chain (see the picture below).

The bottom level represents the producers, followed by primary, secondary and tertiary consumers.

The decomposers and detritivores do not have a particular trophic level.

Decomposers break down dead plants and animals into simpler inorganic substances.

Detritivores are organisms, for example a fungus or an earthworm, that are decomposing organic matter.

Decomposers have very important role in the circle of life.

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Answer:

b. Assigning the decomposers and detritivores to a particular trophic level.

Explanation:

Answer:

oil & mining are big in earth sciences

Answer:

false

Explanation:

there are lot of aspects of Mars that they are disconcerting still like scientists get paid a lot because of that astronomers get paid a lot because of that also.

Answer:

A gene

Explanation:

A gene because you carry those traits from your parents and you keep passing those to your offsprings.

[tex] \: 1.237 \times 10^{23} molecules \: of \:I _{2} \: are[/tex]

[tex]are\: produced \: and \: 53.74 \: g \: of \: I _{2} \: are[/tex]

produced from the reaction.

The overall balanced equation for the reaction is,

[tex]2CuCl_{2} + KI→2CuI + 4KCl + I_{2}[/tex]

[tex]Number \: of \: moles \: ofCuCl_{2}=0.4235 \: mol [/tex]

[tex]2 \: moles \: of \: CuCl_{2} \: produce \: \: 1 \: mole \: [/tex]

[tex]of \: I_{2}.[/tex]

[tex]2 \: mole \: of \: CuCl_{2} = 1 \: mole \: of \: I_{2}[/tex]

[tex]1 \: mole \: of \: I_{2} \: = 6.022 \times 10 ^{23} \: molecules \: of I_{2}[/tex]

So, the number of molecules produced in the reaction of

[tex] I_{2} \: are[/tex]

[tex] = \frac{0.4235 \times 6.022 \times 10 ^{23} }{2 } [/tex]

[tex] = 1.237 \times 10^{23} \: molecules \: [/tex]

[tex]1.237 \times 10^{23} \: molecules \: of \: I_{2} \: are \:[/tex]

produced from the reaction.

[tex]Mass \: of \: I _{2} \: produced \: are \: is ,[/tex]

[tex] = \frac{0.4235 \times 253.8}{2} [/tex]

[tex] = 53.74 \: g[/tex]

[tex] 53.74 \: g \: of \: I _{2} \: produced \: in \: the \:[/tex]

reaction.

[tex]Therefore , \: 1.237 \times 10^{23} molecules[/tex]

[tex]of \: I_{2} \: are\: produced \: and \: 53.74 \: g \: of[/tex]

are produced in the reaction.

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Answer:

erosion

Explanation:

erosion is when the top layer of the earth gets slowly worn away bhy water and ither stuff.

Answer:

Yes. As soon as acceleration disappears, the object just continues with whichever speed it has. The acceleration changes speed; is there no acceleration, then speed is constant.

Explanation:

It forms the basic building blocks of organic molecules this is the carbon's unique bonding ability

Carbon is an essential building block of organic molecules. this is because it has a unique molecular structure that allows it to form many strong bonds with itself and other crucial elements and it is typically combined with hydrogen to form hydrocarbons and hydrocarbons can have single, double, or triple bonds between carbon atoms. carbon atoms can form four covalent bonds and it make strong bond because any molecule are formed with carbon so is does't found rarely in molecule and only one carbon is not present in molecule at a time there are so many carbons are present

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The density in g/cm³ is 0.2095 g/cm³.

The mass of a material substance per unit volume is known as density. The equation for density is d = M/V, where d represents density, M is mass, and V is volume. Density is often measured in grams per cubic centimeter. The weight of an object can be calculated by dividing its mass by the acceleration of gravity; this value is often more significant practically than the mass.

Other tables include information on the weight of various materials per unit volume; this quantity is also known as weight density, specific weight, and unit weight. also take a look at specific gravity. The most popular way to indicate particle density is as n, which instead of referring to the number of particles per unit volume

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The one with higher temperature is the one with NaOH as heatis given off during the neutralization reaction that occurs.

Volume can be defined as the amount of space a substance or an objects occupies usually in a closed container.

Volume is measures in litres.

When water is added to dilute acid like HCl, they become more dilute.

When NaOH is added to HCl, a neutralization reaction occurs.

The student will determine the contents of the flasks by adding 10 ml of hcl to each flask. If the NaOH reacts with the Hcl, there will be an increase in temperature.

The increase in temperature is due to the heat of neutralization of the reaction between NaOH and HCl.

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Explanation:

................easy ngl

Answer:

for protons going down it is:

(already given)

6

6

8

8

17

17

for neutrons going down it is:

6

7

8

(already given)

10

18

20

for electrons going down it is:

6

6

8

8

(already given)

17

Explanation:

bascially the number of protons is the bottom number to the left and the number of electrons is the same as the number of protons and the number of neutrons is basically the mass number (the top right one) minus the proton number

hope this helps:)

Starting with solid argon at room temperature, we need to cool it to -189.2 c to convert it into the liquid state.

Then, we need to heat it slightly till it reaches a temperature of -185.7 c. At this temperature, the liquid argon will convert into gaseous argon.

There are three states of matter i.e, solid state, liquid state, and gaseous state. These states are interconvertible which means that we can convert a substance from one state to another.

The conversion from solid to liquid and then gas or vice versa happens at specific temperatures that are known as boiling point, melting point, freezing point, etc.

The melting point is the temperature at which a solid gets converted into a liquid.

The boiling point is the temperature at which a liquid gets converted into a gas.

The melting and boiling points of Argon are -189.2 °C and -185.7 °C respectively.

Thus, starting with solid argon at room temperature, we need to cool it to   -189.2 °C to convert it into the liquid state.

Then, we need to heat it slightly till it reaches a temperature of -185.7 °C. At this temperature, the liquid argon will convert into gaseous argon.

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