A total of 607 226 candidates registered for the November 2020 NSC examination in SA, while 578 468 candidates wrote the examination calculatetthe number of candidates who did not write and provide a possible reason why

Chemical bonding explains the properties of chemical and biological polymers by forming strong covalent bonds or flexible hydrogen bonds, which give the polymer its unique characteristics.

Chemical bonding is a fundamental concept that explains the properties of chemical and biological polymers. Chemical bonds are formed when atoms interact with each other to form molecules or particles. In a polymer, the atoms are linked together in a repeating pattern, forming a long chain. These bonds give the polymer its unique properties, such as strength, flexibility, and the ability to interact with other molecules. The type of chemical bond formed between the atoms will determine the properties of the polymer.

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Answer:

The coffee has a higher temperature because a pool is so you can have fun and relax in while coffee can warm you up by drinking it.

Explanation:

Hope it helps   :)

Answer:

1.583 moles

Explanation:

Rounded Atomic Mass of Au = 197 grams

\(\frac{312}{197} =1.5837, 1.584\)

The volume in liters of the given copper(II) fluoride solution is 30.3 L.To calculate the volume in liters of the given copper(II) fluoride solution.

We need to use the formula:

moles = concentration x volume

First, we need to convert the mass of copper(II) fluoride from milligrams to grams:

800. mg = 0.8 g

Next, we can calculate the number of moles of copper(II) fluoride:

moles = 0.0026 mol/L x V (where V is the volume in liters)
moles = (0.0026 mol/L) x V

We can now set up an equation to solve for V:

(0.0026 mol/L) x V = 0.8 g / 101.55 g/mol (the molar mass of copper(II) fluoride)

Simplifying the equation, we get:

V = (0.8 g / 101.55 g/mol) / 0.0026 mol/L
V = 30.29 L

Finally, we round our answer to three significant digits, giving us:

Volume = 30.3 L

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Answer:

1935J

Explanation:

Answer:

\(\boxed {\boxed {\sf C. \ 1935 \ J}}\)

Explanation:

The equation for this problem is:

\(q=mc\Delta T\)

where m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

The mass is 3 kilograms, but the specific heat capacity includes grams in the units. Convert kilograms to grams. There are 1000 grams in 1 kilogram.

The specific heat capacity for lead is found on the table. It is 0.129 J/g°C.

Let's find the change in temperature. It is raised from 15 °C to 20 °C.

Now we know every value.

Substitute the values into the formula.

\(q= (3000 \ g)( 0.129 \ J/g \textdegree C)(5 \textdegree C)\)

Multiply the first 2 numbers together. The units of grams cancel.

\(q= (387 \ J/ \textdegree C )(5 \textdegree C)\)

Multiply again. This time the units of degrees Celsius cancel.

\(q= 1935 \ J\)

1935 Joules of energy are required and choice C is correct.

The hydroxides of the elements in the third period of the periodic table can exhibit varying acidity or basicity. Here are some general conclusions that can be drawn:

1. Sodium (Na) and magnesium (Mg) hydroxides: Sodium hydroxide (NaOH) and magnesium hydroxide (Mg(OH)2) are both strong bases and highly alkaline in nature.

2. Aluminum (Al) hydroxide: Aluminum hydroxide (Al(OH)3) can act as both an acid and a base, depending on the conditions. It is amphoteric, meaning it can react with both acids and bases. In acidic solutions, aluminum hydroxide can accept protons and act as a base.

3. Silicon (Si), phosphorus (P), sulfur (S), chlorine (Cl), and argon (Ar) hydroxides: These elements in the third period do not readily form hydroxides under typical conditions. Instead, they form oxides.

Thus, the hydroxides of elements in the third period can exhibit a range of acidity or basicity. Some are strong bases, some are amphoteric, and others do not readily form hydroxides.

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A strong covalent bond between amino acids that functions in maintaining a polypeptide's specific three-dimensional shape is a disulfide bond.

Disulfide bonds are covalent bonds formed between the sulfur atoms of two cysteine residues in a polypeptide chain. These bonds play a crucial role in stabilizing the tertiary structure of proteins by holding specific regions together. Cysteine is an amino acid with a unique property; it contains a sulfur atom within its side chain. When two cysteine residues come close to each other in the protein's three-dimensional structure, the sulfur atoms can undergo oxidation, resulting in the formation of a covalent disulfide bond (S-S bond). This bond is relatively strong and can withstand the harsh conditions within the cell, contributing to the protein's stability.

Disulfide bonds are essential for maintaining the proper folding and structural integrity of many proteins. They help stabilize the protein's tertiary structure by forming bridges between distant parts of the polypeptide chain. These bonds are particularly important in proteins secreted outside the cell or proteins that are exposed to the extracellular environment, as they provide resistance against denaturation and proteolytic degradation.

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It is dangerous to heat a liquid in a closed distilling apparatus without a vent to the atmosphere because pressure builds up as the liquid vaporizes. This can lead to an explosion or equipment failure.

When a liquid is heated, its molecules gain energy and eventually transform into vapor. In a closed system, the vapor has nowhere to escape, causing an increase in pressure within the apparatus. As the pressure continues to rise, it can exceed the capacity of the equipment, leading to potential hazards such as an explosion or damage to the apparatus.
Regarding the boiling points of cyclohexanol and cyclohexene, cyclohexanol is expected to have a higher boiling point due to the presence of hydrogen bonding. Cyclohexanol has an OH group which can form hydrogen bonds, while cyclohexene lacks this functional group and can only form weaker London dispersion forces.
A molecular-level picture of cyclohexanol would show its molecules interconnected by hydrogen bonds between the oxygen atom of the OH group in one molecule and the hydrogen atom of the OH group in another molecule. In contrast, a molecular-level picture of cyclohexene would show its molecules interacting through weaker London dispersion forces, with no specific bond formation between them.

It is crucial to have a vent in a distilling apparatus to avoid dangerous pressure buildup. Based on intermolecular interactions, cyclohexanol has a higher boiling point due to hydrogen bonding, while cyclohexene has a lower boiling point due to weaker London dispersion forces.

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Since the actual value of the atomic radius of platinum  atoms was not given in the problem, I chose 175 pm which gives an error of 18.28%.

The actual atomic radius of platinum atoms is 175 pm

We can see from the question that the measured value of the  atomic radius of platinum  atoms was determined to be 143 pm.

Recall that;

Percent error = Absolute value of (measured value - actual value)/actual value * 100

Since the actual value of the atomic radius was not given, let us take it to be 175 pm for the purpose of this problem

Percent error = Absolute value of (143 - 175)/175 * 100

Percent error = 18.28%

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The percent error of this measured value ; ( D ) approximately 13%

The percent error of a measured value

= [ ( actual value - measured value ) / ( actual value ) ]  * 100

= [ ( 175 pm - 143 pm ) / ( 175 pm ) ]  * 100

=  18.29%

From the options given the closest value to the calculated value is 13%

Hence we can conclude that the percent error of this measured value is approximately 13%.

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Although some data related to the question is missing the actual value of the atomic radius of platinum is 175 pm

Water has a much higher specific heat, than air, because it takes more energy to heat water than it does to heat air.

This is a term which is referred to as the quantity of heat which is required to raise the temperature of one gram of a substance by one Celsius degree.

Water has a higher specific heat because it requires more energy to heat water than it does to heat air and an example is result of the specific heat  of the two variables from various studies by scientists in various parts of the world.

Water has a specific heat of 4.186 J/g degrees celsius, versus air, which has a specific heat of 1.005 J/g degrees celsius which is therefore the reason why water was chosen as the correct choice and the one which has a higher specific heat.

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The amount of chemical contained in 90% of all packages can vary depending on the type of package and the specific type of chemical that is being used.

Generally speaking, when referring to chemicals, the majority of the time the concentration of the chemical in a package will be around 90%. This means that 90% of of the contents of the package will be the chemical itself.

However, it is important to remember that the exact amount of chemical contained in a package may not be 90%. This is because the type of chemical that is being used, the concentration of the chemical mixture, and the type of package itself can all have an effect on the exact amount of chemical contained in a package. In some cases, a package may contain as little as 75% of the chemical while in other cases, it may be as high as 99%.

Therefore, while it is generally safe to assume that 90% of a package will contain a chemical, it is important to take into consideration other factors in order to determine the exact amount of chemical contained in a package.

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Answer:

where is the photo

Explanation:

where is it???

Answer:

Your hypothesis is an educated guess of what the end results of an experiment will be, using what you already know about your experiment you are going to conduct. So when you receive your final results, if your hypothesis is correct, or even somewhat correct then you know that it is supported by your results. For example, if I were to conduct the Coca-Cola and Mentos experiment, I could make a hypothesis that the Coca-Cola will have a bigger eruption when I add more than one Mento to the bottle due to a higher amount of a chemical with the addition of each mento. When I receive my results that the eruption was bigger each time, I know that my results supported my hypothesis.

Explanation:

-Hope this helped

Answer:

Nanowires can be made from a wide variety of materials, including silicon, germanium, carbon, and various conductive metals, such as gold and copper. Their small size makes them good conductors, with electrons passing easily through them, a property that has allowed for important advances in computer science.

The temperature of 2.0 L of water is 42 °C removing thermal energy from the water cause the temperature of the water to increase to 50 °C.

Thermal energy is defined as the internal energy of a system that controls its temperature. Thermal energy is a type of kinetic energy, which is energy brought on by motion, and is brought on by the motion of particles. Solar power plants generate energy through the use of thermal energy.

Q = c × m × Δ T

ΔT = The system's temperature has changed.

The three different processes that lead to heat transmission are described here. When substances are heated, their volume rises, and when they are cooled, it falls.

Thus, the temperature of 2.0 L of water is 42 °C removing thermal energy from the water cause the temperature of the water to increase to 50 °C.

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Answer:

space,mass

Explanation:

Answer:

theres no picture

Explanation:

Answer:

Warming it would make it come out. On a cold day the honey is frozen and atoms will not move as fast and are close toghether. When you warm it the atoms will move faster and the honey will come out of the bottle

Explanation:

Answer:Electrolysis is a process of passing electric current through water thereby splitting water molecules into hydrogen and oxygen.It is a process of breaking apart water molecules using electric current.In electrolysis of water, we use two copper wires, one twelve-volt battery, and some drinking water to do the tests.

Explanation:

Answer: The electrolysis of water will result in two hydrogen atoms and one oxygen atom.

Explanation: Hope this helps you :)

#a

Molar mass of CO2=44g/mol

given mass=4.4g

\(\\ \sf\longmapsto No\:of\;moles=\dfrac{Given\:Mass}{Molar\;Mass}=\dfrac{4.4}{44}=0.1mol\)

#b

0.1mol weigh:-

\(\\ \sf\longmapsto 22.4(0.1)=2.24L\)

#c

No of molecules=Moles×Avagradro No

\(\\ \sf\longmapsto 0.1\times 6.023\times 10^{22}=6.023\times 10^{21}molecules\)

#d

No of molecules=

\(\\ \sf\longmapsto 3\times 6.023\times 10^{21}=18.069\times 10^{21}molecules\)

#e

\(\\ \sf\longmapsto No\:of\:molecules=6.023\times 10^{21}molecules\)

#f

Lets write balanced equation

\(\\ \sf\longmapsto C+O_2=CO_2\)

#g

It has 2oxygen atoms

\(\\ \sf\longmapsto No\:of\:molecules=2(6.023\times 10^{21})=12.046\times 10^{21}\)

Answer:

The primary principle at work in a laser printer is static electricity, the same energy that makes clothes in the dryer stick together or a lightning bolt

Explanation:

Dissolve a sugar cube in water and you still have sucrose, not oxygen, carbon, and hydrogen. This does not mean that sucrose or water cannot be broken down into simpler substances.

But methods must involve a chemical change.

The change in which the molecular composition is completely altered and a new product is formed is called a chemical change.

Chemical changes create a new product.

The changes in chemical change are irreversible and permanent.

A chemical change occurs when the substance's composition is changed. When bonds are broken and new ones are formed a chemical change occurs.

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Explanation:

You have two gases, A and B, each in its own container of equal volume, pressure, and temperature. As a result, each gas must contain the same number of moles.

Because the two temperatures are the same, the two samples' average kinetic energies are also the same.

Kinetic energy is a type of energy that a moving object or particle possesses. When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and acquires kinetic energy. A moving object or particle's kinetic energy, which depends on both mass and speed, is one of its properties. The type of motion could be vibration, rotation on an axis, translation (or travel along a path from one place to another), or any combination of these.

A body's translational kinetic energy, or 1/2mv2, is equal to one-half the product of its mass, m, and the square of its velocity, v. In chemistry, the moles, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles. The mole represents 6.02214076 1023 units, which is a very huge number.

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Answer:

On Sept. 15, 2020, NASA, in partnership with Future Engineers, launched the Artemis Moon Pod Essay Contest. The contest, which is open to all (public, private, and home school) students in grades K-12, asks participants to imagine they are leading a one-week expedition to the Moon’s South Pole. In the essay, students will need to describe to NASA what (and who) they would bring to help make their expedition a success.

The Moon Pod Essay Contest is presented in support of NASA’s Artemis program. The student challenge is part of NASA’s efforts to engage the public in its missions to the Moon and Mars. NASA is returning to the Moon for scientific discovery, economic benefits, and inspiration for a new generation. Working with its partners throughout the Artemis program, the agency will fine-tune precision landing technologies and develop new mobility capabilities that allow robots and crew to travel greater distances and explore new regions of the Moon.

Explanation:

Answer:

I would bring some warm clothes to keep me warm through the night because South Pole is cold. I would also bring blankets and sticks to make a fire. I would bring my bestfriend to keep me company.

Explanation:

Explanation:

It's none of these.

Cr- 1s2 2s2 2p6 3s2 3p6 4s1 3d5

Mg- 1s2 2s2 2p6 3s2

Mn - 1s2 2s2 2p6 3s2 3p6 4s2 3d5

Fe- 1s2 2s2 2p6 3s2 3p6 4s2 3d6

I think there's a mistake in the question.

Answer:

Question 4 is 291.0346

Explanation:

Answer:

I hope this will help you and Please mark me as Brilliant

Explanation:

Consider this balanced chemical equation:

2 H2 + O2 → 2 H2O

We interpret this as “two molecules of hydrogen react with one molecule of oxygen to make two molecules of water.” The chemical equation is balanced as long as the coefficients are in the ratio 2:1:2. For instance, this chemical equation is also balanced:

100 H2 + 50 O2 → 100 H2O

This equation is not conventional—because convention says that we use the lowest ratio of coefficients—but it is balanced. So is this chemical equation:

5,000 H2 + 2,500 O2 → 5,000 H2O

Again, this is not conventional, but it is still balanced. Suppose we use a much larger number:

12.044 × 1023 H2 + 6.022 × 1023 O2 → 12.044 × 1023 H2O

These coefficients are also in the ratio of 2:1:2. But these numbers are related to the number of things in a mole: the first and last numbers are two times Avogadro’s number, while the second number is Avogadro’s number. That means that the first and last numbers represent 2 mol, while the middle number is just 1 mol. Well, why not just use the number of moles in balancing the chemical equation?

2 H2 + O2 → 2 H2O

is the same balanced chemical equation we started with! What this means is that chemical equations are not just balanced in terms of molecules; they are also balanced in terms of moles. We can just as easily read this chemical equation as “two moles of hydrogen react with one mole of oxygen to make two moles of water.” All balanced chemical reactions are balanced in terms of moles.

Example 8

Interpret this balanced chemical equation in terms of moles.

P4 + 5 O2 → P4O10

Solution

The coefficients represent the number of moles that react, not just molecules. We would speak of this equation as “one mole of molecular phosphorus reacts with five moles of elemental oxygen to make one mole of tetraphosphorus decoxide.”

Test Yourself

Interpret this balanced chemical equation in terms of moles.

N2 + 3 H2 → 2 NH3

Answer

One mole of elemental nitrogen reacts with three moles of elemental hydrogen to produce two moles of ammonia.

Answer:

Mitochondria are known as the powerhouses of the cell. They are organelles that act like a digestive system which takes in nutrients, breaks them down, and creates energy rich molecules for the cell. In cellular respiration sugar with the help of oxygen is broken down into ATP (energy molecule).