Identify the number of significant figures in the examples below. Use numbers, not words, to fill in the blanks.

Answer:

There are carbon atoms in every living thing

The atomic weight of the element is 6.9408 amu.

The relative abundance of an isotope is defined as the percentage of atoms of a specific atomic mass that can be found in a naturally occurring sample of an element.

The atomic mass of the first isotope is 7.0150 amu.

The abundance of the first isotope is 92.58 %.

The atomic mass of the second isotope is 6.0150 amu.

The abundance of the second isotope is 7.42 %.

Now, abundance₁ = 92.58 % = = ( 92.58/ 100) = 0.9258

abundance₂ = 7.42 % = (7.42 / 100 ) = 0.0742

Therefore, the average atomic weight is:

Atomic mass = mass₁ × abundance₁ + mass₂ × abundance₂

Atomic mass = (7.0150) × (0.9258) + (6.0150) × (0.0742) amu

Atomic mass = 6.494487 + 0.446313 amu

Atomic mass = 6.9408 amu

The element's atomic weight is 6.9408 amu.

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The property X is an extrinsic property.

The term extensive property refers to the type of property that depends on the amount of the substance present. We must recall that an intensive property does not in any way depend on the number or the amount of the substance present in the sample.

If we have a good look at the table that is being referred to here, we would see that the mass of the substance tends to increase as a certain un named property of the substance X is increasing. This implies that the property X is affected by the mass of the object which is the quantity of matter in the object. This gives us an idea that the property that we are referring to can not be an intrinsic  property since it varies with the mass of the substance that is under study as shown.

We can then conclude that the property X is an extrinsic property.

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Missing parts;

Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table. Which of the following best describes property X?

A. X  is an intensive property because it does not vary with the size of the sample.

B. X is an extensive property because it does not vary with the size of the sample.

C. X is an extensive property because it varies directly with the size of the sample.

D. X is an intensive property because it varies directly with the size of the sample.

The error in the given measurement is determined as 0.85 g/ml.

The error in measurement is a mathematical way to show the uncertainty in the measurement.

Error in measurement is difference between the true measurement and the observed measurement.

The error in the given measurement is calculated as follows;

error = true measurement - observed measurement

error = 6.44 g/ml - 5.59 g/ml

error = 0.85 g/ml

Thus, the error in the given measurement is determined as 0.85 g/ml.

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The complete question is below:

Find the error in the measurement

Answer:

B. the number of neutrons in the nucleus

Explanation:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons

Answer:

the number of neutrons in the nucleus

Explanation:

In an exothermic reaction, the energy of the reactants is greater than the energy of the products.

The term exothermic reaction refers to a kind of reaction in which heat is given out in the system. In this type of reaction, the reaction vessel feels hot as a result of the fact that heat is given out. The energy of the reactants is greater than the energy of the products.

If we look at the enthalpies of an endothermic and exothermic reaction, we can see that the enthalpy of an endothermic reaction is positive while the value of the enthalpy change of an exothermic reaction is negative implying that heat was given out.

In the case of an endothermic reaction, energy is absorbed from this system. In this case, the reaction vessel feels cool as the energy of the products is greater than that of the reactants.

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The solubility of k2so4 at 70oCis 100ml

From the curve, at 70°C temperature 50g of K2SO4 can be dissolved in 100 ml of H2O

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Essential amino acids are the amino acids which cannot be made by the body. Therefore, (d) is the correct answer.

Out of the 20 amino acids, 9 amino acids are essential amino acids - histidine, lysine, isoleucine, methionine, leucine, phenylalanine, valine, threonine, and tryptophan.

While your body may produce non-essential amino acids, it is unable to produce essential amino acids; therefore, you must obtain them from diet.

Animal proteins including meat, dairy, and poultry are the richest providers of essential amino acids. But certain plant meals, such edamame and tofu made from soy, do contain all nine essential amino acids. In other words, they are "complete" suppliers of protein.

Your body converts protein you consume into amino acids, which it then uses for a variety of functions including controlling immune response and constructing muscle.

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The volume of the sample, given the data from the question is 97.7 mL

We'll begin by obtaining the mole of the nitrate ion, NO₃⁻ that contains 2.53×10²² ions. This can be obtained as follow:

From Avogadro's hypothesis,

6.02×10²³ ions = 1 mole of NO₃⁻

Therefore,

2.53×10²² ions = (2.53×10²² ions × 1 mole) / 6.02×10²³ ions

2.53×10²² ions = 0.042 mole of NO₃⁻

Co(NO₃)₂(aq) --> Co²⁺(aq) + 2NO₃⁻(aq)

From the equation above,

2 moles of NO₃⁻ is present in 1 mole of Co(NO₃)₂

Therefore,

0.042 mole of NO₃⁻ will be present in = 0.042 / 2 = 0.021 mole of Co(NO₃)₂

Molarity = mole / volume

Thus,

Volume = mole / molarity

Volume = 0.021 / 0.215

Volume = 0.0977 L

Multiply by 1000 to express in mL

Volume = 0.0977 × 1000

Volume = 97.7 mL

Thus, the volume of the sample is 97.7 mL

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The property of the wood that is to be needed to know to predict how fast the wood would start to burn is combustion.

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Answer:

The number of electrons in atoms determine an element's chemical properties.

Hope this helps in any way :)

Physical separation (picking out pieces or employing density to shake sand to the top), salt dissolution in water, and salt melting are the three techniques used to separate salt and sand.

What is physical separation?

The differing densities of salt and sand are the basis for another physical separation technique. Sand has a density of 2.65 g/cm3, but salt has a density of 2.16 g/cm3.

Based on solubility, one technique for distinguishing salt and sand exists. When a substance dissolves in a solvent, it is said to be soluble. An ionic chemical that is soluble in water is salt, often known as sodium chloride or NaCl.

Based on melting point, there is yet another technique to separate combination components. Sand has a melting point of 3110°F (1710°C), while salt has a melting point of 1474°F (801°C).

Therefore, Physical separation (picking out pieces or employing density to shake sand to the top), salt dissolution in water, and salt melting are the three techniques used to separate salt and sand.

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Answer:

A positive charge of +1

Explanation:

The charge carried by atom depends on the number of protons and electrons present. The neutrons are not charged hence they do not contribute to the net charge of the specie.

The specie mentioned in the question has six protons and five electrons. Hence it has an excess of one positive charge hence a net charge of +1.

ANSWER:

ABCDFGHIJKLMNOPQRSTXYZ

Equation for the Reaction is C2H2+2AgNO3+2NH4OH→C2Ag2+2NH4NO2+2H2O

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The invention of the the microscope helped scientists discover cells.

Cells are the basic unit of life from which all living organisms are built up from.

Prior to the discovery of cells, scientists did not have any instrument to properly view cells.

However, with the invention of the microscope, the English scientist Robert  Hooke was able to discover cells when he viewed plant cells through a microscope.

Today, with the help of more powerful microscopes such as the electron microscope, other structures that are found within the cell have been discovered.

In conclusion, the discovery of cells was aided by the invention of microscope.

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The number of atoms of each element in one mole of the given compound is:

The total number of atoms of each element in one mole of the compound, CH₃(CH₂)₁₂COOH is determined as follows:

Number of atoms in one mole of atoms of an element = 6.02 * 10²³ atoms.

The number of moles of atoms of each element in one mole of the given compound is;

Carbon, C = 1 + 12 + 1 = 13 moles of C atoms

Hydrogen, H = 3 + 2 * 12 + 1 = 28 moles of H atoms

Oxygen, O = 2 moles of atoms of O

Number of atoms in 13 moles of C atoms = 13 * 6.02 * 10²³ atoms.

Number of atoms in 13 moles of C atoms = 7.826 * 10²⁴ C atoms

Number of atoms in 28 moles of H atoms = 28 * 6.02 * 10²³ atoms.

Number of atoms in 28 moles of H atoms of an element = 1.685 * 10²⁵  H atoms

Number of atoms in 2 moles of O atoms = 2 * 6.02 * 10²³ atoms.

Number of atoms in 2 moles of O atoms = 1.204 * 10²⁴ O atoms

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Answer:

yes, atomic structure the center of the atom is nucleus ;

The nucleus is the positively charged centre of an atom and contains most of its mass. It is composed of protons, which have a positive charge, and neutrons, which have no charge. Protons, neutrons, and the electrons surrounding them are long-lived particles present in all ordinary, naturally occurring atoms.

ΔTf=−0.634°C

Explanation:

We're asked to find the freezing point depression of a solution.

To do this, we use the equation

ΔTf= i⋅m⋅Kf

where,

ΔTf is the change in freezing point temperature that we're trying to find.

i  is the Van't Hoff factor, which is given as 1 (and usually is 1 in the case of nonelectrolytes)

m is the molality of the solution, which is

molality = mol solute /kg solvent

Convert the given mass of sucrose to moles using its molar mass:

35.0g sucrose(1lmol sucrose342.30g sucrose)=0.102 mol sucrose

The molality is thus

molality=0.120lmol sucrose/0.3000lkg water=0.341m

K f is the molal freezing point constant for the solvent (water), which is given as −1.86°C/m

Plugging in known values, we have

ΔTf=(1)(0.341m)(−1.86l°C/m)

=−0.634l°C

This represents how much the freezing point decreases. The new freezing point of the solution is found by adding this value from the normal freezing point of the solvent ( 0.0°Cfor water):

new f.p. = 0.0°C −0.634°C

= −0.6341°C

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Answer:

D

Explanation:

the particles stick together, it can be covalent compound or ionic compound

Luster and malleable are the properties of metals.

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-1,616.7 kJ/mol

2C₂H₂(g) +50₂(g) →4CO₂(g) + 2H₂O(g)

AGC₂H₂=209.2 kJ/mol

AGE.co2=-394.4 kJ/mol

AG H2O-228.57 kJ/mol

AG 5O2 = ?

Now From the above given equation , we have got the enthalpy of no. of moles in reaction

4 moles of CO₂ contains = 4 -394.4 kJ/mol = -1577.6

2 moles of H₂O contains = 2 -228.57  kJ/mol = - 457

2 moles of C₂H₂ contains  = 2 209.2 kJ/mol = +418.4

now putting all the values in equation

50₂(g) = 4CO₂(g) + 2H₂O(g) - 2C₂H₂(g)

50₂(g) = -1577.6-457-418

50₂(g) = -1,616.7 kJ/mol

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The percent weight of the solution is 20% sugar solution.

The concentration of a solution is the amount of solute that is present in a given volume or mass of a solution

The concentration of a solution can be expressed as:

The percent weight of the solution is determined as follows:

Mass of sugar = 6.00 g

Mass of water = 9.00 g

Mass of solution = 9.00 + 6.00

Mass of solution  = 15.00 g

Weight percent of solution = 6/15 * 100

Weight percent of solution = 20% sugar solution

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Answer:

A'toms comes from the Greek language.

Hope this helps :)

Answer:

Quantum chemistry strives to accurately predict chemical and physical properties of molecules and materials, which is useful to many fields of science and engineering. Predicting chemical properties using a first principles approach at the atomic scale is a theoretical and computational challenge.

Explanation:

The value of the equilibrium constant, K of the reaction is 0.055 M

The value of the equilibrium constant, K of the reaction is determined as follows:

Equation of reaction: 2 A (aq) ⇄ 2 B (aq) + C (aq)

Initial moles of A present = 0.88 mol

Volume of solution = 3.00 L

At equilibrium,

moles of C present = 0.150 moles

moles of B present = 2 * 0.150 moles

moles of B present = 0.300 moles

moles of A present = 0.880 - (0.300 + 0.150)

moles of A present = 0.430 moles

Concentration of C = 0.15/3 = 0.050 M

Concentration of B = 0.45/3 = 0.150 M

Concentration of A = 0.43/3 = 0.143 M

K = (0.050 * 0.150²)/0.143²

K = 0.055 M

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Conversion of 7.6cm^3 to m^3 is 0.0000076m^3

Divide the volume by the conversion ratio to convert a cubic centimeter measurement to a cubic meter measurement. The cubic centimeters divided by 1,000,000 gives the volume in cubic meters.

The same attribute is expressed using a unit conversion, but in a different unit of measurement. For instance, time can be stated in minutes rather than hours, and distance can be expressed in kilometres, feet, or any other measurement unit instead of miles.

We need to convert between units in order to ensure accuracy and prevent measurement misinterpretation. For example, we do not measure a pencil's length in kilometers. In this situation, one must convert from kilometers (km) to centimeters (cm).

Conversion:

1m = 100cm

1m = 10^2cm

1cm = 10^-2m

1cm^3 = (10^-2)^3m^3

1cm^3 = 10^-6m^3

7.6cm^3 = 7.6 x 10^-6m^3

7.6cm^3 = 0.0000076m^3

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In FET colleges, there are six broad area of study: arts, business, education, engineering, management, and agricultural.

Institutions offering Further education and Training (FET) are those that offer instruction and training to students in grades 10 through 12.

It also includes training that is efficient and career-focused that is provided by technical, community, and private universities.

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