Which three groups of the periodic table contain the most elements classified as metalloids (semimetals)?

Answers

Answer 1
The metalloids are mostly concentrated in groups 14, 15, and 16. (Some simpler charts will show them as 4A, 5A, and 6A - take a look at the top of the periodic table your class uses to double-check).

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Answer 2

Answer:

germanium

Explanation:

EDGE 2021

Second one on that question is

promethium


Related Questions

What are families of elements with similar chemical properties called?

Answers

It is called groups.
Final answer:

The families of elements with similar chemical properties are called groups in the periodic table.

Explanation:

The families of elements with similar chemical properties are called groups in the periodic table. Elements in the same group have the same number of valence electrons and therefore exhibit similar chemical behaviors. For example, the alkali metals in Group 1 and the halogens in Group 17 both have similar reactivity due to their respective valence electron configurations.

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A certain ore is 32.6% nickel by mass. How many kilograms of this ore would you need to dig up to have 75.0 g of nickel?

Answers

To obtain 75.0 grams of nickel from an ore that is 32.6% nickel by mass, one would need to mine approximately 0.230 kilograms of the ore.

The student is asking about the quantity of a nickel ore that would need to be processed to obtain a specific amount of pure nickel. If the ore is 32.6% nickel by mass, one needs to perform a simple calculation by setting up a proportion:

32.6 g ore contains 1 g nickel,

The calculation is as follows:

Multiply the desired quantity of nickel (75.0 g) by 100.

Divide this product by the percentage of nickel in the ore (32.6%).

This gives the mass of the ore required to be:

(75.0 g nickel) × (100/32.6) / 100% = 230 g ore (approximately, using significant figures)

To convert this to kilograms, we know that 1 kg = 1000 g, so:

230 g = 0.230 kg

Therefore, one would need 0.230 kilograms of this nickel ore to extract 75.0 grams of nickel.

Name an element or elements in the periodic table that you would expect to be chemically similar to potassium.

Answers

Potassium (K) is in Group I of the periodic table, and elements in the same column (period) are similar. Sodium (Na), or lithium (Li) are similar.
Final answer:

Potassium is chemically similar to other Group 1 elements (Alkali metals) on the Periodic Table like Lithium, Sodium, Rubidium, Cesium, and Francium due to having comparable electron configurations.

Explanation:

Elements that are chemically similar to potassium are mainly those within the same group (Group 1) on the periodic table. These elements, known as the Alkali metals, have similar chemical behavior due to having one electron in their outermost shell. Examples include Lithium (Li), Sodium (Na), Rubidium (Rb), Cesium (Cs), and Francium (Fr).

This group of elements shares similar properties, such as being silvery and soft, and being highly reactive, especially with water. They also have comparable physical properties such as low densities and low melting points when compared to other metals.

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A mixture of ethyl iodide (c2h5i, bp 72.3°c) and water boils at 63.7°c. what weight of ethyl iodide would be carried over by 1 g of steam during steam distillation?

Answers

You only need to know first is the vapor pressure of water at that boiling point which is ~ 179 mm hg.


 So the (vapor pressure of C2H5I = 760 – 179)


And since you know the molecular weight of H2O which is equal to18 g/mol and the molecular weight of C2H5I = 156 g/mol.

Just apply the equation: 


grams H2O M.W.      H2O × P H2O 


----------------------    = -------------------------- =  28.13 grams C2H5I 


grams C2H5I M.W.   C2H5I × P C2H5I

Final answer:

To determine the weight of ethyl iodide carried over by 1 g of steam during steam distillation, we need to calculate the mole fraction of ethyl iodide in the mixture and multiply it by the weight of the steam.

Explanation:

The boiling point of a solution can be determined using Raoult's law, which states that the vapor pressure of a solvent above a solution is equal to the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. In this case, we are looking for the weight of ethyl iodide carried over by 1 g of steam during steam distillation. Since the mixture of ethyl iodide and water boils at 63.7°C, we know that the vapor pressure of ethyl iodide at 63.7°C is equal to the vapor pressure of steam at that temperature.

To determine the weight of ethyl iodide carried over by 1 g of steam, we need to calculate the mole fraction of ethyl iodide in the mixture. We can use the equation:

mole fraction of ethyl iodide = weight of ethyl iodide / weight of ethyl iodide + weight of water

Once we have the mole fraction of ethyl iodide, we can multiply it by the total weight of the steam (1 g) to find the weight of ethyl iodide carried over.

What is the first quantum number of a 2s2 electron in phosphorus, 1s22s22p63s23p3?

Answers

Answer:

n = 2

Explanation:

The first quantum number of 2s2 electron in phosphorus will be 2 which is principle quantum number.

What is quantum number?

Quantum numbers are just a sequence of numbers that represent the location and momentum of a particular atom or ion.

Calculation of quantum number.

It is given that, 2s2.

Here, 2 will be the principle quantum number.

Therefore, the first quantum number of 2s2 electron in phosphorus will be 2 which is principle quantum number.

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What effect does the presence of an impurity have on the freezing point of a liquid?

Answers

When impurities are added to a liquid, the freezing point will decrease. For example, pure water at standard atmospheric pressure freezes at 0°C (32° F). If table salt (NaCl) is added to the water, the freezing point will drop to a lower temperature.

In fact, the Fahrenheit scale was developed around water fully saturated with salt. A completely salt-saturated sample of water freezes at 0° F   (-17.78 °C)

Suppose you are given a sample of a homogeneous liquid what would you do to determine whether it is a solution or a pure substance

Answers

We can determine it by distillation. Heat the sample till it starts boiling and starts vaporizing and maintain the temperature till the solution is either completely turned into vapor meaning its pure or leaves a solute behind meaning its a solution.

Final answer:

To determine if a homogeneous liquid is a solution or a pure substance, examine its composition and properties. A homogeneous mixture, such as a solution, has a uniform composition throughout, while a pure substance has a fixed and definite composition. Perform tests like measuring boiling or freezing points to confirm the nature of the liquid.

Explanation:

A sample of a homogeneous liquid can be determined to be a solution or a pure substance by examining its composition and properties.

In a homogeneous mixture, such as a solution, the composition is uniform throughout the mixture. This means that any sample of the liquid will have the same composition as any other sample. On the other hand, a pure substance, which can be either an element or a compound, has a fixed and definite composition.

To determine whether the liquid is a solution or a pure substance, you can perform tests such as measuring its boiling or freezing point. If the liquid has a consistent boiling or freezing point, it indicates that it is a pure substance. If the liquid does not have a fixed boiling or freezing point, it suggests that it is a solution since the different components may have different boiling or freezing points.

Four most common oxyanions of Iodine

Answers

HIO= Hypoiodous acid; IO-=Hypoiodite
HIO2= Iodous acid; IO2= iodite
HIO3=Iodic acid; IO3-= iodate
HIO4=Periodic acid; IO4-=Periodate

Answer:

[tex]IO_4^-= Periodate\ ion[/tex]

[tex]IO_3^-= Iodate\ ion[/tex]

[tex]IO_2^-= Iodite\ ion[/tex]

[tex]IO^-= Hypoiodite\ ion[/tex]

Explanation:

Oxyanions:

Oxyanions are anions that have one or more oxygen atoms bonded to another elements is called oxyanions.

General formula of oxyanions are : [tex]A_xO_y^{z-}[/tex]

Where, A represents an element and O represents oxygen atom.

Four most common oxyanions of Iodine are:

[tex]IO_4^-= Periodate\ ion[/tex]

[tex]IO_3^-= Iodate\ ion[/tex]

[tex]IO_2^-= Iodite\ ion[/tex]

[tex]IO^-= Hypoiodite\ ion[/tex]

obtaining scientific data from a distance is called ?????

Answers

I think it’s observation. But again I’m not sure.

Answer;

-Remote sensing

Explanation;

-Remote sensing involves obtaining information about objects or areas from a distance, typically from aircraft or satellites.

-Remote sensors collect data by detecting the energy that is reflected from Earth. These sensors can be on satellites or mounted on aircraft.Remote sensing has a wide range of applications, such as coastal applications (monitoring shoreline changes), ocean applications to monitor ocean circulation and current systems, and hazard assessments among other applications.

Which of the following is not stage in the development of a thunderstorm

Answers

The formation of thunderstorm takes place through a cycle. It has three stages. Cumulus stage, Mature stage and dissipating stage are the three stages. Strong updrafts act to build up storm in the first stage.Heavy precipitation and winds are experienced in second stage. It gets weakened in the third stage.

Answer:

updraft stage

Explanation:

Which of the following is NOT made up of atoms

Answers

What is it?
You didn't put up the questions

Answer:

i think the answer choices is

A-Heat

B-A Gas

C-A cell

D-A solid

Explanation:

Why does an increase in reaction temperature generally increase the reaction rate?

Answers

Increasing reaction temperature increased the kinetic energy in the system. In fact, the measurement of temperature indirectly relates the relative amount of kinetic energy in a system. 
An increase in kinetic energy results in more rapid and forceful molecular collisions, thereby increasing the rate of molecular interactions (and in a fixed-volume system, the pressure increases as well!). Hence, the reaction can occur more quickly.

To minimize the sharp ph shift that occurs when a strong acid is added to a solution

Answers

To minimize the sharp pH shift that occurs when a strong acid is added to a solution, IT IS PRACTICAL TO ADD A WEAK BASE.
When a strong acid is added to a solution, it usually brings about a sharp change in the pH of the concerned solution. To avoid this, one can add a  weak base to the solution first. The weak base will serves as a buffer for the strong acid and prevents the solution from experiencing sharp pH variations.

A urine sample has a mass of 147 g and a density of 1.010 g/ml. what is the volume of this sample?

Answers

Volume = Mass / Density 

Volume = 147g / 1.010 g/ml

Volume = 146 ml

Final answer:

To find the volume of a urine sample with a mass of 147 g and a density of 1.010 g/ml, divide the mass by the density. The volume is 145.54 ml.

Explanation:

The volume of the urine sample can be calculated using the formula:

Volume = Mass / Density

Given data:

Mass = 147 gDensity = 1.010 g/ml

Substitute the values and calculate:

Volume = 147 g / 1.010 g/ml = 145.54 ml

Therefore, the volume of the urine sample is 145.54 ml.

An atom has 16 protons and 17 neutrons. What is the chemical symbol for the atom? Consult the periodic table.
Question 8 options:

A.33Cl

B.32S

C.33S

D.32Cl

Answers

The answer is C.33S. I had this question as well. Hope this helps you :)

The symbol of a chemical element whose atom has 16 protons and 17 neutrons is 33S. Thus, the correct option for this question is C.

What are Protons?

Protons may be defined as the type of sub-atomic particles that are significantly present in the nucleus of an atom along with neutrons. Protons are positively charged in nature. It might be thought that protons are discovered by Ernest Rutherford.

If an atom has 16 protons, it means that it has an atomic number of 16. According to the periodic table, the atomic number 16 is occupied by the sulfur element. While chlorine elements have an atomic number of 17.

Now, the atomic mass is equal to the number of protons plus the number of neutrons. So, atomic mass = 16 + 17 = 33.

Therefore, the symbol of a chemical element whose atom has 16 protons and 17 neutrons is 33S. Thus, the correct option for this question is C.

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When 2.5 moles of oxygen gas (o2) are consumed in their reaction, _____ mol of carbon dioxide are produced?

Answers

The reaction is not given here but we take an example reaction to understand how to calculate moles.

Let the balanced equation for the reaction is
C3H8 (g) + 5 O2 (g) → 3CO2 (g) + 4 H2O (g)

From here 5 moles of oxygen produces 3 moles of carbon dioxide

So 2.5 moles of oxygen produces 2.5/5 x 3 = 0.5 x 3 = 1.5 moles of carbon dioxide

 

Final answer:

Based on the combustion reaction 2 CO(g) + O₂(g) → 2CO₂(g), 2.5 moles of oxygen gas consumed would produce 5 moles of carbon dioxide.

Explanation:

When 2.5 moles of oxygen gas (O₂) are consumed in their reaction, to determine how many moles of carbon dioxide (CO₂) are produced, we need a balanced chemical equation. A common combustion reaction is 2 CO(g) + O₂(g) → 2CO₂(g), which indicates that for every mole of O₂ consumed, two moles of CO₂ are produced. Thus, if we consume 2.5 moles of O₂, we would typically produce 5 moles of CO₂, as the mole ratio is 1:2 between O₂ and CO₂.

An atom of copper (cu) has a mass number of 63 and an atomic number of 29. how many protons does it have?

Answers

The total number of protons in Copper is 29. 

Answer:

29

Explanation:

How often do you need to make a fresh bleach solution?

Answers

A new bleach solution is prepared on a daily basis. This is also subject to the type of container in which the bleach is stored, but the problem is with the containers from which you have to pour from a bottle. Whenever the bottle is opened, air from the atmosphere comes into the bottle and causes the bleach to decompose, especially bleaches using hydrogen peroxide. This is also the reason that bleaches do not have an actual shelf-life of more than a month. After a month, they're just sterile water.

"according to the modern theory of the atom, where may an atom’s electrons be found?"

Answers

Because it is only possible to find the location OR velocity of an electron, we have to assume the location of the electron(s) is somewhere around the atom. 

Final answer:

Electrons in an atom, according to modern quantum mechanics, can be found in an electron cloud, occupying regions of space around the nucleus with probabilistically determined densities.

Explanation:

According to the modern theory of the atom, known as quantum mechanics, an atom's electrons can be found within specific regions of space around the nucleus, often referred to as the electron cloud.

Unlike the earlier Bohr model which suggested electrons travel in discrete orbits, quantum mechanics proposes that electrons exist in probabilistic distributions - the regions where electrons are most likely to be found.

These distributions are characterized by four quantum numbers, much like a home address, with the first three providing an approximation of the electron's location in the atom and the fourth describing the electron's spin direction.

The electron cloud has variable densities, indicating the likelihood of finding an electron at a given location; the closer to the nucleus, the higher the density. This concept is crucial for understanding how atoms interact and react with one another, as chemical reactions are typically a result of interactions between the valence electrons of different atoms.

In summary, electrons occupy shells and subshells that define an atom's electron configuration, which in turn influences the atom's chemical behavior.

Scientific laws explain_____. why a pattern in nature occurs how a pattern in nature occurs a pattern in nature observed over and over strong evidence in support of a hypothesis

Answers

Hi, I just submitted this, and your answer is a pattern in nature observed over and over

I hoped I helped you, 
Dawn

Answer: a pattern in nature observed over and over

Explanation:

Scientific law is the statement(s) which describes or helps in the predicting the natural phenomena. The information in the scientific law is valid and it is verified by the experimental procedures and observations. It can be used to explain the cause of a natural phenomena, conditions responsible for natural phenomena, occurrence of the natural phenomena, also gives information why a natural phenomena repeat itself over and over again.

Identify the mixture of powdered charcoal and powdered sugar and suggest a technique for separating their components

Answers

To separate powdered charcoal from powdered sugar, add water to dissolve the sugar, use gravity filtration to remove charcoal, and evaporate the water to recrystallize the sugar.

The mixture described containing powdered charcoal and powdered sugar is a heterogeneous mixture. A technique to separate these components would be filtration. Since charcoal is insoluble in water and sugar is soluble, we can add water to the mixture to dissolve the sugar.

After the sugar has dissolved, we can use gravity filtration to separate the charcoal from the sugar solution. The charcoal will stay in the filter paper while the sugar solution passes through.

To recover the sugar from the solution, we could then evaporate the water, leaving behind solid sugar. It's important to break up any clumps and use hot water to ensure efficient dissolving and filtration. If the charcoal passes through the filter paper, it might be necessary to refilter or use a filter aid like Celite.

A piece of iron 12mm by 15mm has a mass of 3.6 grams. what is the thickness of the piece of iron, in mm, given that the density of iron is 7.8 g/cc. show you work below; include units; record your answer in scientific notation to 1 digit past the decimal

Answers

Thickness = 2.6 x 10^0 mm First, determine the volume of iron you would have if the mass was 3.6 grams. 3.6 g / 7.8 g/cc = 0.4615 cc Now divide that volume by the 2 dimensions you have to determine the size of the 3rd dimension needed 0.4615 (cm)^3 / (1.2 cm * 1.5 cm) = 0.4615 (cm)^3/(1.8 cm^2) = 0.256388889 cm = 2.56388889 mm = 2.6x10^0 mm

How are structures of ionic compounds fundamentally different then covalent compounds?

Answers

The structure differs mainly because ionic compounds involves a transfer of one or more electrons from one atom to another whilst the covalent compound involves of sharing of electrons .

What is the law of conservation of mass and how is it related to the results of a chemical reaction?

Answers

mass is not created or destroyed 

A handbook gives the density of calcium as 1.54 g/cm3. based on lab measurements, what is the percentage error of a density calculation of 1.25 g/cm3? 37. what is the percentage error of a length measurement of 0.229 cm if the correct value is 0.225 cm?

Answers

Percentage error is a measure of the accuracy of a measurement or calculation, expressed as a percentage relative to the true or accepted value.

Percentage error = ( Experimental value  − True value / True value ) × 100 %

a) Percentage Error of Density Calculation:

Experimental Density = 1.25 g/cm³

True Density = 1.54 g/cm³

Percentage Error= ∣ 1.25−1.54 / 1.54 ∣  × 100 %

                            ≈ 18.83 %

b) Percentage Error of Length Measurement:

Given:

Experimental Length = 0.229 cm

True Length = 0.225 cm

Percentage Error=  ∣ 0.229  − 0.225 cm / 0.225 cm  ∣   × 100 %  

                             = 1.78 %

Therefore, The percentage error in density is 18.83 % and percentage error in length measurement is 1.78 %

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What is one goal of physical science?

Answers

The goal of science is to expand knowledge while the goal of technology is to apply that knowledge.

Which electron configuration exhibits the ground-state electron configuration for molybdenum (element 42)?

Answers

Molybdernum, Mo has atomic number 42. Hence 42 electron.


...in shorthand: [Kr] 5s2, 4d4 
...or in full: 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d4

What substance is a yellow solid and melts at 115 degrees celsius?

Answers

The substance in question that is solid during room temperature, but ultimately ends up melting when heated to the temperature of 115 degrees celsius, can be seen in the substance known as sulfur. It is also a gaseous substance when put under certain conditions that alter it.

PLEASE HELP ME ILL GIVE YOU A LOT OF POINTS

The volume of water in a graduated cylinder is 8.0 cm^3. The volume changes to 10.5 cm^3. when a 6.50 g sample of a substance is lowered into the cylinder. What is the density of the substance?

Answers

Density= mass/volume
Mass=6.50 grams
Volume=Change in volume=10.5-8.0cm^3
Volume=2.5 cm^3
Density=6.50 grams/2.5 cm^3
Density=2.6 grams/cm^3
Final answer:

The density of the substance is found by dividing its mass by its volume. The volume of the substance is determined by the change in the water level in a graduated cylinder when the substance is added. The calculated density of the substance is 2.6 g/cm³.

Explanation:

The density of a substance can be calculated by using the formula: Density = Mass / Volume. In this case, the volume of the substance can be determined by the change in water level in the graduated cylinder when the substance is added. The initial volume is 8.0 cm³, and the final volume is 10.5 cm³. So, the volume of the substance is the difference between the two volumes, which is 2.5 cm³.

The mass of the substance is given as 6.50 g. Now, we can substitute the mass and volume into the formula to find the density: Density = 6.50 g / 2.5 cm³ = 2.6 g/cm³. So, the density of the substance is 2.6 g/cm^3.

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Explain how a skateboard resting on the ground contains energy. If the skateboard were moving , would it have more energy than it did at rest? Explain.

Answers

When the skate board is resting, it has potential energy, if it started to move the energy would increase and become kinetic energy.
A resting skateboard has potential energy, meaning that it's being stored.
If it starts moving, it now has kinetic energy, meaning it has more energy.
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