You were helping your science teacher put away lab materials. They asked you to carry sand, iron filings, and salt in cups to put away. However, a fellow student left their backpack in the middle of the floor. You fell over it and dropped all of the materials. After sweeping up the mess, all of the sand, iron filings and salt are mixed together. Your job now is to use the physical properties of these substances to separate the mixture and return the pure substances to their separate containers.
What physical property or properties might help you remove salt from the mixture? (2 points)
What process will you use to separate the salt from the mixture? (2 points)
What physical property of properties might help you remove iron from the mixture? (2 points)
What process will you use to separate the iron from the mixture? (2 points)
What physical property or properties might help you remove sand from the mixture? (2 points)
What process will you use to remove sand from the mixture? (2 points)
Now, list the steps that you will take to separate the three components of the mixture. Be specific enough that someone else could complete the mixture separation exactly as you have planned to do it. You may use bullet points and labeled diagrams to answer this question. (8 points, see rubric)

The chemical equation below shows the reaction of sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl).

2Na + Cl₂ ---->   2NaCl,     NaCl formed is an ionic compound.

Sodium is a metal and have tendency to donate an electron and form Na⁺ .The chlorine is a non metal and have tendency to accept electron and form Cl⁻ ion. The positively charged Na⁺  ion and negatively charged Cl⁻ ion form ionic bond . An ionic bond is formed by the complete transfer of electrons. The product is form is NaCl , sodium chloride.

Thus, The chemical equation below shows the reaction of sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl).

2Na + Cl₂ ---->   2NaCl,     NaCl formed is an ionic compound.

To learn more about Ionic compound here

https://brainly.com/question/9167977

#SPJ1

It emphasizes that un-electrified regions have been left behind by international advances in technology. Option A.

A central idea is the central unifying element of a story that ties together all other elements of fiction that the author uses to tell the story. The central idea is best described as the dominant impression or universal, prevalent truth found in the narrative: renewable energy sources such as wind, water, solar and geothermal.

The refrigerator or freezer may be out of power. The phone line goes down and the phone signal is lost. When the battery gets low, the phone becomes useless as there is no backup charging option. The gas central heating doesn't work and the tap stops pumping clean water quickly. Sustainable energy comes from resources that can sustain continuous operation without jeopardizing the energy needs or climate of future generations.

Learn more about The central idea here:-https://brainly.com/question/24572492

#SPJ9

Answer:

Plants perform photosynthesis in the presence of sunlight, water and carbon dioxide to produce food and oxygen. Sunlight, water and carbon dioxide are the raw materials; food and oxygen are the products of photosynthesis

Answer:

Photosynthesis is the conversion of light energy into chemical energy by living organisms.

Explanation:

The raw materials are carbon dioxide and water; the energy source is sunlight; and the end-products are oxygen and (energy rich) carbohydrates, for example sucrose and starch. This process is arguably the most important biochemical pathway, since nearly all life depends on it. It is a complex process occurring in higher plants, phytoplankton, algae, as well as bacteria sucl as cyanobacteria. Photosynthetic organisms are also referred to as photoautotrophs.

Based on the mole fraction, the mass percentage of K₂SO₃ in the  solution is 23.0%

The mass percentage of K₂SO₃ in the given solution is determined from the mole fraction as follows:

The mole fraction of K₂SO₃ = 0.0328 moles

The moles of water in the solution = 1 - 0.0328 moles

The moles of water in the solution = 0.9672 moles

The mass of K₂SO₃ = 0.0328 * 158.26 g

The mass of K₂SO₃ = 5.19 g

The mass of water in the solution = 0.9672 * 18.016

The mass of water in the solution = 17.42 g

Total mass of solution = 5.19 + 17.42

Total mass of solution = 22.61 g

Mass percent of K₂SO₃ = 5.19/22.61 * 100%

Mass percent of K₂SO₃ = 23.0%

Learn more about mass percent at: https://brainly.com/question/23856068

#SPJ1

Copper is made up of two isotopes ⁶³Cu(62.9296 amu) ⁶⁵Cu(64.9278 amu) Giving copper atomic weight of 63.546 then the percentage abundance of each isotope ⁶³Cu = 70% and  ⁶⁵Cu = 30.848%

Isotopes are the members of a family of elements that all have the same number of protons and different numbers of neutrons

Here given data is

⁶³Cu = 62.9296 amu

⁶⁵Cu = 64.9278 amu

atomic weight = 63.546

We have to calculate percentage abundance of each isotope = ?

Let the natural abundance of ⁶³Cu is x

The natural abundance of ⁶⁵Cu 100−x

atomic weight  is 63.546

Then 100×63.546 = 63x + 65(100−x)

= 6354.6 = 63x + 6500−65x = 6500−2x

= 2x = 145.4

= x = 72.7≃70

Hence the natural abundance of ⁶³Cu is is 70%

Therefore for ⁶⁵Cu the calculation the also same and  ⁶⁵Cu =  30.848%

Know more about percentage abundance

https://brainly.com/question/28295541

#SPJ1

The different types of electromagnetic radiation are: Radio waves, Microwave, Infrared waves, Visible light, Ultraviolet waves, X-rays, Gamma rays. Radio waves have the lowest frequencies, and gamma rays have the highest frequencies.

Radio waves are electromagnetic radiation with frequencies as high as 300 gigahertz (GHz) to as low as 30 hertz (Hz). At 300 GHz of frequency, the corresponding wavelength is 1 mm, and at 30 Hz it is estimated to be 10,000 km.

Microwaves are a type of electromagnetic radiation. The wavelengths of microwave ranges from about one meter to one millimeter; with frequencies between 300 MHz (1 m) and 300 GHz (1 mm).  

Infrared waves are a type of electromagnetic radiation. They are often referred to as thermal radiation because they are emitted from objects that are hot.

The visible spectrum is the portion of the electromagnetic spectrum that can be seen by the human eye. The spectrum ranges from 380 to 750 nanometers. The colors of the visible spectrum are often described as a rainbow: red, orange, yellow, green, blue, and violet.

Ultraviolet (UV) radiation is a type of electromagnetic radiation that is located before the visible range this region is invisible to the human eye. It has a shorter wavelength than visible light and is able to penetrate the atmosphere, making it harmful to living organisms.

X-rays are a type of electromagnetic radiation that is used to create images of the inside of the body. X-rays are produced by a machine called an X-ray tube.  X-rays are used to diagnose many different conditions, including broken bones, tumors, and pneumonia.

Gamma rays are much more energetic than any of those other types of radiation. In fact, gamma rays are so energetic that they can actually kill living cells.

To know more about Planck's Law, click below:

https://brainly.com/question/1673393

#SPJ9

If x = − 4,  number line shows the value of |x| is 4 tick mark to the left of zero.

given that :

x = -4

The absolute value is the distance from zero. The absolute value is always positive.

| x | = | -4 | = 4

The absolute value = distance from the zero.

a number line contains negative and positive number . number to the right side of zero is positive and to  the left side of zero is negative. Absolute value means how far the number is from zero.

Thus, If x = − 4,  number line shows the value of |x| is 4 tick mark to the left of zero.

To learn more about absolute value here

https://brainly.com/question/1301718

#SPJ1

Answer

B. Basic

Explanation

Any solution above 7.0 (from 7.1 to 14.0) is alkaline/basic. This type of solution is at 11, meaning it is alkaline/basic.

The number of electrons that hydrogen needs in order to have a full shell of valence electrons are one valence electron.

Valence shell electrons refer to the electrons that are found in the outermost shell of atoms of elements.

Valence electrons are the electrons that are involved in the chemical reactions of atoms of elements.

Atoms of elements take part in chemical reactions in order to achieve an octet or duplet structure which confers stability to the atoms.

Duplet refers to two complete valence electrons while octet refers to eight complete valence electrons.

Learn more about octet and duplet at: https://brainly.com/question/14222356

#SPJ1

Answer:

one valence electron

Explanation:

K is the symbol for potassium, and the number of valence electrons can be found through its' group on the periodic table. Hence, it has one valence electron.

C. Under these conditions, hydrogen / ethanol will release more energy in 1 second is the correct answer.

To know more about Hydrogen check the below link:

https://brainly.com/question/2079874

#SPJ1

The option (1) water supply i.e. the biotic factor that affect the human most.

An ecosystem's overall health is also influenced by biotic factors such as the diversity of consumers and the presence of autotrophs, or self-sustaining organisms like plants. Abiotic variables have an impact on an organism's capacity for survival and reproduction. Abiotic barriers prevent the formation of population .

To know more about biotic factor

https://brainly.com/question/27430655

#SPJ1

Significant figures

0.0093: Leading zeros are never significant. This number has two significant figures, nine and three.

120.9: Nonzero numbers are significant and zeros between those numbers are significant, too. This number has four significant figures.

1.000: Trailing zeros are significant if there is a decimal point. This number has four significant figures.

1.008: Nonzero numbers are significant and zeros between those numbers are significant, too. This number has four significant figures.

670: Trailing zeros are not significant. This number does not have a decimal point. So, it has two significant figures.

0.184: Nonzero numbers are significant. This number has three significant figures.

1.30: Trailing zeros are significant if there is a decimal point. This number has three significant figures.

Nuclear Model - Supported by Rutherford's gold foil experiment.

Nuclear Model - A small, dense, positively-charged nucleus surrounded by a negatively-charged electron cloud.

Quantum Mechanical Model - This is the current model of atomic structure which explains the existence of electron clouds and their discrete energy levels.

Plum Pudding Model - Was disproved by Rutherford's gold foil experiment.

Plum Pudding Model - Negatively-charged electrons randomly dispersed in a sea of positive charge.

Bohr Model - Sometimes referred to as the Planetary Model.

Bohr Model - The atom has a small positively-charged nucleus with negatively-charged electrons orbiting in different energy levels.

Learn more about atomic models:https://brainly.com/question/25534456

#SPJ1

An element that is oxidized is one that loses electrons, losing electrons increases its oxidation state. Now, the more electrons there are in the last energy level of the element, that is, valence electrons, the easier it will be for this element to lose them. We can identify valence electrons in the periodic table, the group to which the element belongs indicates how many valence electrons it has. Let's see what the oxidation state of the elements is:

F:7

Li:1

N:5

Be:2

O:6

We see that Lithium is the one with the fewest valence electrons, it has only one valence electron, so this will be the element that is most likely to be oxidized.

Answer: 2. Li

Answer: Unknown

Explanation:

In order to solve the question you would require the approximate amount of gravity upon the diver, meaning his acceleration due to gravity.

The atom's radius and mass increase from top to bottom. The density of elements from top to bottom also increases in a periodic table.

Density of Sn= Mass of Sn/Volume of Sn

                     =24.3968/7.28

                     =3.49 g/ml*ml/cm³

                     =3.49 g/cm³

It is accurate to assume that the density of Sn will fall between that of Si and lead .  the mass number and radius of the atoms increase from group to group as we move from top to bottom in a periodic table.. The density rises because the increase in mass number is greater than the increase in radius. Simply multiplying by the molar mass of the gas  allows one to derive the formula for mass density from the formula for number density. Do not forget that the mass is equal to the moles (n) times the molar mass (M).  Smaller masses can be measured in grams instead of kilograms (kg), which is the standard SI unit for mass.

To learn more about density please visit:

https://brainly.com/question/406690

#SPJ4

Answer:

Pb, Sn, Te, S, Cl

Explanation:

1) List the compounds involved in the reaction.

Lead (II) nitrate

Potassium sulfate

Lead (II) sulfate

Potassium nitrate.

2) Write the formula of every compound.

Lead (II) nitrate: Pg(NO3)2

Potassium sulfate: K2SO4

Lead (II) sulfate: PbSO4

Potassium nitrate: KNO3

3) Write the chemical equation

.

List the elements (or polyatomic ions) in the reactants.

Pb: 1

NO3: 2

K: 2

SO4: 1

List the elements (or polyatomic ions) in the products.

Pb: 1

NO3: 1

K: 1

SO4: 1

Balance K.

List the elements (or polyatomic ions) in the reactants.

Pb: 1

NO3: 2

K: 2

SO4: 1

List the elements (or polyatomic ions) in the products.

Pb: 1

NO3: 2

K: 2

SO4: 1

4) Balanced chemical equation.

.

A photon of light is released when an electron in its orbit around an atom transitions from a high energy state to a lower energy state. The statement E=hf, where h is Planck's constant.

It can be used to relate the energy of the photon to the frequency f of the photon, which is related to the color of the photon. The difference in energy between the two states is what causes the photon's varied wavelength (or, alternatively, frequency). The element's spectrum is made up of these released photons. The atomic emission spectrum of an element shows only specific colors, which indicates that only specific light frequencies are emitted. Excited electrons that revert to the ground state result in atomic emission spectra. The energy of the particular electrons are reflected in the light that is emitted. Because each element has a unique collection of electron energy levels, each element's emission spectrum is unique. The disparities between various pairs of numerous energy levels are shown by the emission lines. As electrons transition from higher energy orbitals to lower energy orbitals, lines (photons) are released. Nuclear Spectra. When atoms are stimulated, they release light at specific wavelengths that are associated with various colors.

Every element generates an own collection of spectral lines. Since no two elements produce the identical spectral lines, the line spectrum of an element can be used to identify it.

To know more about electronic transition, please refer:

https://brainly.com/question/28295405

#SPJ4

Answer: It decreases as it goes down and increases as it goes to the right.

Explanation: This is because as it goes down, the elements are becoming bigger which makes the distance from the proton and electron to become further, causing the attraction to weaken. While as it goes to the right across a period, it increases because the number of protons increase and we know that if there are more protons, the pull of the electrons from the nucleus becomes stronger.

We do not have enough information to deduce the isotope that would have nine neutrons. Option 5

The atom is composed of subatomic particles. The subatomic particles that are in the atom are such that we have the electrons that are negatively charged, the protons that are positively charged and the neutrons that are uncharged.

Now, we know that the number of neutrons is obtained as the difference between the mass number and the atomic number of the atom. In this case, we only have the mass numbers and not the atomic numbers thus we do not have sufficient information.

Learn more about neutrons:https://brainly.com/question/28992636

#SPJ1

The element is likely a member of the noble gas family, which contains elements that are generally unreactive. A particular substance is typically found in nature as a pure element.

From this, we can conclude that the element is not reactive. The noble gas family is a group of elements in the periodic table that include helium, neon, argon, krypton, xenon and radon.

They are all non-reactive and have very low reactivity. The noble gases are all found in the air and are used in a variety of ways. Helium is used in balloons and airships, while argon is used in fluorescent lights. Krypton and xenon are used in flash photography, and radon is used in cancer treatment.

Learn more about reactivity at :

https://brainly.com/question/1598581

#SPJ4

To calculate the mass of Helium, we look up in the periodic table the atomic mass. This is equal to 4.003 g/mol.

Now, we apply the following relation to doing the conversion:

The mass of a Helium sample that contains 0.448 moles of He is 1.793 g

Explanation:

Orbitals are filled according to the aufbau principle. That is, lower energy orbitals are filled before higher energy orbitals are filled. Therefore, fill each energy level before moving up

Answer:

The second last option is correct.

0.83 moles present in 15 grams of water .

moles=given mass/molar mass

given mass=15 grams

molar mass, water=18 gram

moles=given mass/molar mass

moles=15/18

moles=0.83

The mole concept is a helpful technique to quantify the amount of a material. When dealing with particles at the atomic (or molecular) level, it is recognized that even one gram of a pure element has a vast number of atoms. The mole concept is widely used in this context. The most used unit of measurement is the "mole," which is a count of a significant number of particles.

The number 6.02214076*1023, also known as the Avogadro constant, is usually denoted by the letter "NA". Among the elementary things that may be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).

To know more about  moles visit : brainly.com/question/15209553

#SPJ9

Answer:

The process of separating a metal from its ore is known as smelting.

Answer:

Explanation:

look at the periodic table to see where 8 electrons is on the table,  Oxygen is 8, so this is an Oxygen atom,  next what group does Oxygen belong to?  It's reactive non-metals,  if you didn't look at the periodic table