Calculate the mass of camphor (C₁0H₁60) that contains a billion (1.00 × 10°) hydrogen atoms.
Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.

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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Answer:

Cobalt(III) Borate CoBO3 Molecular Weight -- EndMemo.

Explanation:

The accurate measurement is 0.51s and precise one is 0.516 s to 0.524 s.

0.51 is accurate measurement because this value is more closer to 0.500 s compared to other given options.

The measurement of 0.516 and 0.524 must have taken from highly precised instrument because it is capable of making measurement upto 3 decimal place.

Hence 0.516s and 0.524s is most precise team.

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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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Answer:

Organic compound features:

Explanation:

Complex structures

High molecular weights

Depend on Carbon, Hydrogen and Water

Combustile in nature

Form covalent bonds

Low melting and boiling points

5.845 mg of table salt provides the upper safe limit  in the recommended daily requirement of sodium.

Molar mass of common table salt that is sodium chloride is         23.0+35.5=58.5 g/mole which is the addition of molar masses of sodium and chlorine,the constituents of sodium chloride.

As the common table salt is 39.3% sodium by mass therefore it has 23.01975 g or 23019.75 mg of sodium.

                      39.3/100×58.5=23019.75

As 58.5 g of sodium chloride has 23.019 g of sodium therefore 2.3 g of sodium is present in 5.845 g, which is 5.845×10[tex]^-3[/tex]mg.

                 2.3×58.5/23.019=5.845 mg.

Mass percent of any compound is usually calculated as mass of the compound divided by it's total mass and then multiplied by hundred.It is a way of expressing concentration of a component.It describes how much solute is present in 100 grams of solution.

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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 heating is done to eliminate water from the molecule, if second heating is not done it means water is present in a compound so it will show higher molecular mass. The artificial calculated mole of water is lower.

Mole is defined as a standard scientific unit  for measuring large quantity for very small unit.

Heating is done to eliminate water from the compound, if second heating is not done it means water is present in the compound. While calculating we will get higher molecular mass and moles of water is lower then the actual value.

The artificially calculated moles of water is lower, because the student consider the lower initial mass. The difference between the said value and calculated value is also lower and the student will think that less water was consumed on heating.

Thus, the heating is done to eliminate water from the molecule, if second heating is not done it means water is present in a compound so it will show higher molecular mass. The artificial calculated mole of water is lower.

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Taking into account the definition of density, the metal with a volume of 12.3 mL and a mass of 96.7 g is iron.

Density is defined as the property of matter, whether solid, liquid, or gas, that allows the amount of mass in a given volume of a substance to be measured.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

In this case, you know that:

Replacing in the definition of density:

density= 96.7 g÷ 12.3 cm³

Solving:

density= 7.86 g/cm³

On the other hand, you know that the densities of zinc, chromium and iron are 7.89, 7.20 and 7.86 g/cm³, respectively.

Finally, the metal with a volume of 12.3 mL and a mass of 96.7 g is iron.

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Luster and malleable are the properties of metals.

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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

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 density of pure water is 1 g/cm^3.

Its density is 0.98 g cm 3 at room temperature, in comparison with the handiest zero.92 g cm 3 for ice, a reality that has to be defined through atomic, and molecular concepts. If ice has been no longer much less dense than water, it might sink, having a devastating impact on lake backside ecosystems. believe it or now not, ice is honestly about 9% much less dense than water. for the reason that water is heavier, it displaces the lighter ice, causing the ice to glide to the pinnacle.

The density of ice is about 90 percent that of water, but that could range because ice can contain air, too. meaning that about 10 percent of an ice cube or iceberg will be above the water line. The density of water is maximum at four∘C, and the density of the ice is much less than the water due to its susceptible intermolecular pressure of attraction. as the density of water is more, it's miles heavier than ice. therefore ice floats on the floor of the water. Ice continually floats due to the fact it's far less dense than everyday water. because frozen water molecules shape a crystal.

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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.

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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The elements involved could be ba--rium and strontium.

We know that the ionization energy refers to the energy that must be supplied in order for an electron to leave the atom. The energy could bee supplied in the form of heat or light.

In the question, we have the first four ionization energies of the elements X and Y. The lower first and second ionization energies suggest that the electrons are removed from the outermost shells and that the two elements are divalent. That explains the quantum jump that occurs after the second ionization energy in each case.

The low first and second ionization energies implies that the elements are highly electropositive and are likely to be ba--rium and strontium.

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Answer:

7.51

×

10

24

The density

ρ

of a sample is its ratio of mass

m

to volume

V

:

ρ

=

m

V

.

To find the number of atoms in this sample, first multiply the volume by the density to get the mass. Then divide this mass by the mass of one atom.

133

c

m

3

T

a

(

17.0

g

1

c

m

3

)

(

1

atom

T

a

3.01

×

10

−

22

g

T

a

)

=

7.51

×

10

24

Ta atoms

Answer:

Atoms

Explanation:

Atoms are made of extremely tiny particles called protons, neutrons, and electrons. Protons and neutrons are in the center of the atom, making up the nucleus. Electrons surround the nucleus. Protons have a positive charge.

When atoms close in and overlap each other; atoms repel each other. When atoms lie separated from each other; atoms attract each other

According to the theory of valence bonds, a covalent bond is made up of two atoms that are joined together and produce a pair of electrons that are shared by both of their bonded atomic orbitals. When a portion of one orbital and a portion of a second orbital occupy the same region of space on two separate atoms, we say that their orbitals overlap. The valence bond theory states that a covalent bond forms when two circumstances are true:

1. orbital on one atom overlaps another, and two solitary electrons in each orbital come together to form an electron pair.

2. atoms are physically connected by a force known as a covalent bond thanks to the attraction between this negatively charged electron pair and the positively charged nuclei of the two constituents. The degree of orbital overlap determines how strong a covalent bond will be. Stronger bonds are created by orbitals with more broad orbital overlap than by those with less overlap.

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Answer:

Atomic radius is the radius of an atom. It can be attained through measuring the radius of an atom in a variety of bonds and averaging them to get it.

Explanation:

First we will balance the given equation:

NaBH4 (s) + BF3(g) B₂H6(g) + NaBF4(s)

Balanced equation:

3NaBH4 (s) + 4BF3(g) 2B₂H6(g) + 3NaBF4(s)

ii) 4 moles of BF3 reacts with 3 mole of NaBH4

1 mole of BF3 reacts with 3/4 = 0.75 mole of NaBH4

so the 1.299 moles of BF3 will react with 1.299× 0.75 = 0.974 moles of NaBH4

iii) 3 moles of NaBH4 gives 2 moles of B2H6

1 mole of NaBH4 gives 2/3 = 0.6 moles of B2H6

so, 0.893 mole of NaBH4 will give 0.893 × 0.6 = 0.535 molesof B2H6.

iv) 2 moles of B2H6 is produced with 3 moles of NaBF4

if 1 mole of B2H6 is produced then 3/2 = 1.5 moles of NaBF4 is produced with it.

so is 1.987 mol of B2H6 is obtained then 1.987 × 1.5 = 2.98 moles of NaBH4 will be obtained.

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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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Answer:

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

Hope this helps in any way :)

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:

The conclusions that can be drawn from the examination is that peanuts contain lipids and proteins.

Sudan IV is a dye used for staining of lipids ,triglycerides.The test making use of Sudan IV involves adding a few drops of Sudan IV to the solution containing lipids.

If no lipids are present in the sample ,the dye sinks at the bottom of the test tube.Positive test for Sudan IV involves the color of the reagent changing to red.

Biuret  test is a chemical test used for detection of peptide bonds that is in turn proteins present in a sample.In the presence of proteins, it forms a violet color co-ordination complexes in alkaline range.

The test can be used for testing the concentration of proteins as peptide bonds occur along the same frequency per amino acid.

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