Choose One Of The Following Prompts To Write About. Your Answer Must Be In Complete Sentences And Use (2024)

Answer:

A.) Beaker

B.) Watch Glass

C.) Wire Gauze

D.) Iron Ring

E.) Funnel

F.) Test Tube

G.) Eye Dropper

H.) Pipettes

I.) Tongs

J.) Thermometer

K.) Graduated Cylinder

L.) Ring Stand

M.) Bunsen Lab Burner

N.) Test Tube Holder

O.) Utility Clamp

P.) Water Bottle

Q.) Goggles

R.) Test Tube Rack

S.) Erlenmeyer Flask

T.) Evaporating Dish

U.) Hot Plate

V.) Scoopula/Spatula

The volume of krypton is 2824.213 ml

What is Volume?

Volume can be defined as a measure of occupied space of a closed container.

In the given question, the volume is gotten by dividing the mass by the density.

parameters given

Density=0.003749g/ml

mass= 3.09g

Volume= mass/density

volume=3.09/0.003749

volume= 2824.213 ml

In conclusion, volume of can be gotten by dividing mass by density.

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When 1 mole of sodium chloride is mixed with 4 mole of magnesium chloride, the number of chloride ion present will be 5.4198 x [tex]10^{24}[/tex] molecules

Number of molecules in substances

1 mole of sodium chloride contains 1 mole of chloride ion according to the following equation:

NaCl ---> [tex]Na^+[/tex] + [tex]Cl^-[/tex]

4 moles of magnesium chloride will contain moles of chloride ions according to the following equation:

[tex]4MgCl_2 --- > 4Mg^{2+} + 8 Cl^-[/tex]

The total number of moles of chloride ions in solution:

1+8 = 9 moles.

1 mole of a substance = 6.022 x [tex]10^{23}[/tex]

Thus, the total number of chloride ions present in the mixture = 9 x 6.022 x [tex]10^{23}[/tex]

= 5.4198 x [tex]10^{24}[/tex] molecules

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The building blocks of DNA (the nucleotides) are gotten from inside the nucleus of cells during replication.

What is replication?

Replication is a biological process during which copies of DNA are made in the cells of living organisms.

Double helix DNAs are first unwound and each strand forms a template for the replication of a daughter strand. Complementary nucleotide bases are added to the growing daughter strands until replication is complete.

Nucleotide bases lie freely within the nucleus of living organisms and come in handy during the replication process.

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When the thermal energy of the air around a fire is transferred to the surrounding air A. The thermal energy is spread out by the surrounding air.

Thermal energy transfers occur in 3 approaches conduction, convection, and radiation. whilst thermal power is transferred among neighboring molecules that are in touch with each other, which is referred to as conduction.

Thermal strength refers to the power contained inside a system that is liable for its temperature. heat is the go with the flow of thermal electricity. an entire department of physics, thermodynamics, offers how heat is transferred among exceptional systems and how work is accomplished in the manner.

Thermal strength also referred to as heat strength is produced when a rise in temperature reasons atoms and molecules to transport quicker and collide with each other. The energy that comes from the temperature of the heated substance is referred to as thermal strength.

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A. The patch's area in square kilometers (km²) is 1.61×10⁻⁹ km²

B. The cost of the patch to the nearest cent is 734 cents

A. How to convert 16.1 cm² to square kilometers (km²)

We can convert 16.1 cm² to km² as illustrated below:

Conversion scale

1 cm² = 1×10⁻¹⁰ km²

Therefore,

16.1 cm² = 16.1 × 1×10⁻¹⁰

16.1 cm² = 1.61×10⁻⁹ km²

Thus, 16.1 cm² is equivalent to 1.61×10⁻⁹ km²

B. How to determine the cost in cent

We'll begin by converting 16.1 cm² to in². This can be obtained as illustrated below:

1 cm² = 0.155 in²

Therefore,

16.1 cm² = 16.1 × 0.155

16.1 cm² = 2.4955 in²

Finally, we shall the determine the cost in centas fo r llow:

Cost per in² = $2.94 = 294 centCost of 2.4955 in² =?

1 in² = 294 cent

Therefore,

2.4955 in² = 2.4955 × 294

2.4955 in² = 734 cents

Thus, the cost of the patch is 734 cents

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When we convert Bilbo's shire property (i.e 108540 m²) to acres, the result obtained is 26.82 acres

Data obtained from the question

From the question given above, the following data were obtained:

Bilbo's shire property (in m²) = 108540 m²Bilbo's shire property (acres) = ?

How to convert 108540 m² to acres

We can convert 108540 m² to acres by doing the following

Conversion scale

4047 m² = 1 acre

Therefore

108540 m² = 108540 / 4047

108540 m² = 26.82 acres

Thus, 108540 m² is equivalent to 26.82 acres

Therefore, we can conclude that Bilbo's shire property in acres is 26.82 acres

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The scientific method is the method used for scientific discovery.

What is the scientific method?

The scientific method is the process or procedure which scientists follow in their discovery and explanation of natural phenomena.

The scientific method is as follows:

Observations/QuestionsHypothesisExperimentsResultsConclusions

Using the scientific method to determine if water is needed by plants to grow

Question: Is water needed for growth in plants?

Hypothesis: Plants need water

Independent variable: sunlight

Dependent variable: rate of evolution oxygen

Constant variable: sunlight and soil

Materials: Cupboard, soil, potted plant, water,

Procedure: One potted potted plant is watered, while the other is not watered. The length of the plant is measured after 10 days

Observation: The watered plant survived and grew while that which was not watered did not grow but died.

Conclusion: water is needed for growth in plants.

In conclusion, the scientific method can be used to determine if plants need water for growth.

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A challenge to food safety in an operation is the growing elderly population in the U.S. (Option B).

What is food safety?

The term food safety makes reference to strategies of a government aimed at giving the best nutrition possible to the population, which depends on its demographic features.

In conclusion, a challenge to food safety in an operation is the growing elderly population in the U.S. (Option B).

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The non-example of a pistil is anther.

What is a pistil ?

The portion of a flower that produces ovules is called pistil . The ovary frequently supports a lengthy style that is capped with a stigma. The mature ovary is a fruit, and the mature ovule is a seed. The stigma is the area of the pistil where pollen develops. The expanded basal area of the pistil where ovules are formed is the ovary.

What is a anther ?

The stamen is the name for a flower's male reproductive organ. It is made up of a filament, which is a long tube with a pollen-producing structure on the end. The anther is the name of this oval-shaped component. It is essential for blooming plants to reproduce because it creates pollen, a male gametophyte.

Thus from above conclusion we can say that the non-example of a pistil is anther.

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Answer:

when there is a group of organs that work together they are called the organ system

Explanation:

Explanation:

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The elements are in the unknown sample of emission spectrums is lithium and potassium.

What are the elements?

When light is emitted through a chemical material, it is known as an emission spectrum. An emission spectrum is a development of many types of lines in a variety of colors and wavelengths.

The red line emits light with the longest wavelength, which may be easily measured using a spectrophotometer when light passes through it.

Lithium and potassium are hence elements in the unidentified emission spectrum sample. B and E are the proper answers.

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Missing parts:

The emission spectrums are known for the elements below. Line spectra for boron, lithium, hydrogen, helium, potassium and unknown sample. Boron has 3 purple lines, 1 blue line, 2 blue-green lines and 2 orange lines. Lithium has 2 purple lines, 2 blue lines, 2 blue-green lines, 1 orange line and 1 red line. hydrogen has one line of each purple, blue, blue-green and red. helium has 3 purple lines, 3 blue lines, 3 blue-green lines 1 yellow line and 2 red lines. Potassium has 8 purple lines, 6 blue-green lines, 10 green lines, 3 yellow lines, 2 orange lines and 6 red lines. The unknown sample has Potassium has 8 purple lines, 6 blue-green lines, 10 green lines, 3 yellow lines, 2 orange lines and 6 red lines. What elements are in the unknown sample? Check all that apply. boron lithium hydrogen helium potassium

1.c. methanol unknown

2.d. glycerin unknown

3. b. ethanol unknown

4. a. syrup unknown

How to calculate concentration in mL?

The molarity (M) is the relationship between the solute matter (n1) and the volume of a solution (V), that is, M = n1/V. Since the matter of solute is given in mol and the volume is given in liters, the unit of measurement for molarity is mol/L.

1.c. methanol unknown 1. 2.d. glycerin unknown 2. 3. b. ethanol unknown 3. 4. a. syrup unknown 4.

With this information, we can conclude that Molarity, molar concentration, concentration in mol/L or concentration in amount of matter is the ratio of the amount of matter in the solute to the volume of solution, expressed in the unit mol/L. Molarity can also be expressed in mol/dm³. The solution is formed by the solute and the solvent.

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The annual production of carbon dioxide will be 95 x [tex]10^1^0[/tex] kg

Mathematical operation

1 gallon gasoline = 9.5 kg carbon dioxide

1 car = 5000 miles

1-gallon gasoline = 20 miles

40 million cars = 5000 miles

If 1 car covers a distance of 5000 miles, the mileage of 40 million cars will be:

40,000,000 x 5000 = 200,000,000,000 miles.

For every 20 miles, 1 gallon of gasoline is consumed. The total gasoline consumed by the 40 million cars will be:

200,000,000,000/20 = 10,000,000,000 gallons

1 gallon of gasoline gives off 9.5 kg of carbon dioxide.

The total amount of carbon dioxide produced by the 40 million cars will be:

9.5 x 10,000,000,000 = 95 x [tex]10^1^0[/tex] kg

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Answer:

0.92% NaCl

Explanation:

To find the weight percent (aka. mass percent), you need to use the following equation:

mass of solute (g)
Mass Percent = --------------------------------- x 100%
mass of solvent (g)

In this case, NaCl is the solute and water is the solvent. You can plug the given values into the equation and solve for the mass percent.

4.6 g NaCl
Mass Percent = ------------------------ x 100%
500 g H₂O

Mass Percent = 0.0092 x 100%

Mass Percent = 0.92%

Saline solutions, NaCl (aq), are often used in medicine, weight percent of NaCl in solution of 4.6 g of NaCl in 500g of water is 0.92 %

What is saline solution ?

Water and sodium chloride are combined to make saline. It can be used in medicine for a variety of purposes, including as cleaning wounds, removing and storing contact lenses, and treating dry eyes.

It is used intravenously to treat dehydration, including that caused by gastroenteritis and diabetic ketoacidosis.

Mass % = mass of solute in gram ÷ mass of solvent in gram × 100

NaCl is the solute in this scenario, while water is the solvent. You may solve for the mass % using the above data as inputs into the equation.

Mass % = 4.6 g of NaCl ÷ 500g of water × 100

= 0.0092 × 100 %

= 0.92 %

Thus, the weight percent of NaCl in solution of 4.6 g of NaCl in 500g of water is 0.92 %.

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We need a color key to determine the pH of a solution using pH indicator paper.

What is pH?

pH is the measure of the hydrogen ions concentration in a solution which means the measure of acidity or alkalinity of the solution.

Generally, the pH scale ranges from 0 to 14.

A solution having a pH less than 7 is said to be acidic whereas a solution having a pH more than 7 is considered basic or alkaline

A solution having a pH equal to 7 is said to be neutral

What are pH indicators?

pH indicators are weak acids that are found as natural dyes and that change color to show how many H⁺ (H3O⁺) ions are present in a solution.

The substance you are analyzing has an acidic, basic, or neutral pH value, which is calculated from the negative logarithm of H⁺ concentration.

The paper form of pH indicators is typically dipped into solutions and then removed for comparison against a color/pH key. Usually, the liquid form of pH indicators is added directly to solutions.

Thus, a color key or pH key is needed to determine the pH of a solution using pH indicator paper.

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Answer:

color key

creating a color key

have known PH values

A

Explanation:

hope this helps its all the answers in one

1. The mass in grams of Y3 present is 1152 g

2. The mass in grams of B2 present is 864 g

Description of mole

The mole of a substance is related to it's mass and molar mass according to the following equation

Mole = mass / molar mass

With the above formula, we can obtain the mass of Y3 and B2. Details below:

1. How to determine the mass of Y3Mole of Y3 = 12 moles Molar mass of Y3 = 3 × 32 = 96 g/mol Mass of Y3 =?

The mass of Y3 can be obtained as follow:

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of Y3 = 12 × 96

Mass of Y3 = 1152 g

2. How to determine the mass of B2Mole of B2 = 8 moles Molar mass of B2 = 2 × 54 = 108 g/mol Mass of B2 =?

The mass of B2 can be obtained as follow:

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of B2 = 8 × 108

Mass of B2 = 864 g

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Fossil fuels are considered non-renewable sources of energy because they cannot be replenished within a human lifetime when they are exhausted.

What are fossil fuels?

Fossil fuels are formed from the remains of dead plants and animals which died many million years ago.

Fossil fuels are considered non-renewable sources of energy.

Non-renewable energy sources are energy sources which can not replenished within a human lifetime when they are exhausted.

In conclusion, fossil fuels are non-renewable because they take a lot of time to be replenished.

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Answer:

The scientific notation for 0.000083 is 8.3 × 10-5

The 'e' notation for 0.000083 is 8.3^e-5

The number 0.000083 has 2 significant figures

Explanation:

1 - Move the decimal 5 times to right so there is one non-zero digit to the left of the decimal point, untill the resulting number, m (= 8.3), is greater than or equal to 1 and less than 10 (m is the, so called, mantissa).

Since we've moved the decimal 5 times to the right, the exponent will be a negative number n (= -5).

2 - Write in scientific notation form m × 10n,

where m = 8.3 and n = -5.

Therefore, the number 0.000083 written in scientific notation is 8.3 × 10-5 and it has 2 significant figures.

How to convert 0.000083 into "e" notation

We've already converted the number to scientific notation. So, we just need to replace the ' × 10n ' by an 'e'.

Therefore, the 'e' notation for 0.000083 is 8.3^e-5.

Taking into account the scientific notation, the result of the subtraction is -4.20689×10⁻².

Scientific notation

Scientific notation is a quick way to represent a number using powers of base ten, where the numbers are written as a product:

a×10ⁿ

where:

a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.

Subtraction in scientific notation

When the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found. In this case, the highest exponent is -2.

Then all the values ​​are expressed as a function of the base 10 exponent with the highest exponent. In this case: 3.11×10⁻⁵= 0.00311×10⁻²

Taking the quantities to the same exponent, all you have to do is subtract what was previously called the number "a". In this case:

0.00311×10⁻² - 4.21×10⁻²= (0.00311 - 4.21)×10⁻²= -4.20689×10⁻²

Finally, the result of the subtraction is -4.20689×10⁻².

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Rube Goldberg machines, follows the “law of conservation of energy as it uses a chain reaction to complete a simple task in different manner.

How to illustrate the information?

In this machine, various instant kinetic energy is transferred into potential energy and vice-versa, so the total energy remains conserved. Therefore, Rube Goldberg machines follows the law of conservation of energy.

In the machine when marble rolls down from the top it has kinetic energy, the marble hits and falls into a plastic cup, its kinetic energy is then transferred into potential energy that lifts the soda can. Then the potential energy is changed into kinetic energy.

When the marble comes in contact with the next marble, its kinetic energy is transferred to other marble.

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After precipitation falls, the water moves into the lithosphere through openings in the rock or soil. This process is called percolation.

Therefore, Option C is the correct option.

What is Evaporation?

Evaporation is defined as the process of conversion of liquid into vapours.

For example: Conversation of water into water vapours.

But int he question, there is no conversion. So this option is incorrect option.

What is Sublimation?

Sublimation is the process of conversion of solid directly into the vapour phase

Since, there is no conversion of of solid into vapours. So, this option also incorrect option.

What is Mineralization?

Mineralization is defined as the process through which chemicals which is present in organic matter are decomposed or oxidized easily in the available forms to plants.

As there is no decomposition of minerals. So, this is also incorrect option.

What is Percolation?

Percolation is defined as the process in which liquid slowly allow to pass through a filter.

So, this is correct option.

Thus, we concluded that the water moves into the lithosphere through openings in the rock or soil. This process is called percolation.

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The time taken for the reaction to produce 6.0 x 10²³ molecules is determined as 11.54 seconds.

What is chemical reaction rate?

The rate of a chemical reaction is the change in concentration over the change in time. It can also be said as, the rate at which molecules are produced.

Time taken for the reaction to produce 6.0 x 10²³ molecules

time = number of molecules / rate of reaction

time = (6 x 10²³) / (5.2 x 10²²)

time = 11.54 seconds

Thus, the time taken for the reaction to produce 6.0 x 10²³ molecules is determined as 11.54 seconds.

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Mercury is an element that has a mass number of 80 and has 45 neutrons.

What are the features of Mercury element?

Mercury is a chemical element with the symbol Hg and atomic number 80. Atomic number is 80 whereas Atomic mass: 200.59 u. Its Melting point is-38.83 °C, Boiling point is 356.7 °C and the Atomic radius is 150 pm. It is a liquid metal that belongs to Group 12 (IIb) or zinc group of the periodic table. It is metal which can be used to produce thermometers, barometers, and other tools. Mercury also conducts electricity and is used to make switches.

So we can conclude that Mercury is the element that has a mass number of 80 and has 45 neutrons.

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The correct answers to the questions are:

1. Molarity

2. Mole fraction

3. Molality

4. Solvent

5. Solute

What is molarity?

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Thus, a way to express concentration that provides the moles of solute per liter of solution is molarity

How to determine the mole of fraction of NaClMole of sodium chloride, NaCl = 5 molesMole of sucrose = 4 molesMole of water = 11 moles Total moles = 5 + 4 + 11 = 20 molesMole fraction of NaCl =?

Mole fraction = mole / total mole

Mole fraction of NaCl = 5 / 20

Mole fraction of NaCl = 0.25

Thus, the mole fraction of sodium chloride is 0.25

What is molality?

This is defined as the mole of solute per unit kilogram of solvent. It can be expressed mathematically as:

Molality = mole / mass (in Kg) of solvent

Thus, the expression of concentration that provides the moles of solute per kilograms of solvent is molality

What is a solvent?

A solvent is a substance which disolves other substance.

Thus, if 0.15 grams of sodium chloride dissolves in 1 liter of water, then, the water is called the solvent

What is a solute?

This is a substance that dissolves in solvent.

Thus, if 0.15 grams of sodium chloride dissolves in 1 liter of water, then, sodium chloride is the sloute

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The equation for the base dissociation constant, Kp, of NH3 is given as; Kp = [ NH4^+] [OH-]/[NH3]

What is the base dissociation constant?

The term base dissociation constant refers to the number that shows the extent to which a base dissociates in water. A high value of the dissociation constant implies that the base is completely dissociated in water.

Having said that, we can see that the equation for the base dissociation of NH3 is obtained as; NH3(aq) ⇄ NH4^+(aq) + OH-(aq). We also know that water is in large extent hence it does not come into the dissociation equation.

Thus the equation for the base dissociation constant, Kp, of NH3 is given as; Kp = [ NH4^+] [OH-]/[NH3]

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1. The number of mole of CO produced is 4 moles

2. The number of mole of H₂ produced is 12 moles

Balanced equation

2CH₄ + 2H₂O -> 2CO + 6H₂

From the balanced equation above,

2 moles of CH₄ reacted to produced 2 moles of CO and 6 moles of H₂

How to determine the mole of CO produced

From the balanced equation above,

2 moles of CH₄ reacted to produced 2 moles of CO

Thereffoer,

4 moles of CH₄ will also react to produce 4 moles of CO

Thus, 4 moles of CO were obtained from the reaction.

How to determine the mole of H₂ produced

From the balanced equation above,

2 moles of CH₄ reacted to produced 6 moles of H₂

Thereffoer,

4 moles of CH₄ will react to produce =(4 × 6) / 2 = 12 moles of H₂

Thus, 12 moles of H₂ were obtained from the reaction.

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Missing part of the question:

See attached photo

Davy used the same separation technique to pull apart caustic soda, or lye, and as such this would reveal another new element known as sodium.

What is a separation technique?

A separation technique can be defined as a technique that is used to separate (convert) two or more mixture and solution of chemical substances into distinct products such as solutes, chemical compounds or elements.

What is a chemical element?

A chemical element can be defined as a pure substance which comprises atoms that have the same atomic number (number of protons) in its nuclei and as such it is the primary constituent of matter.

Generally, some examples of a chemical element include the following:

Argon.Sodium.Carbon.Oxygen.Hydrogen.

In Chemistry, sodium hydroxide, caustic soda, or lye all refer to the same chemical compound which is represented by this chemical symbol, NaOH.

According to the narration, Davy used the same separation technique to pull apart caustic soda, or lye, and as such this would reveal another new element known as sodium.

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Answer:

0.25 mL

Explanation:

Since the density is a ratio comparing the mass (g) of the object per every 1 mL, you can use it to convert the given mass (3 grams) to volume. In other words, you can find the volume by multiplying the given mass by the density. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator).

Density = 12.02 g/mL

3 grams 1 mL
---------------- x ---------------------- = 0.25 mL
12.02 grams

*0.2 mL is the answer with 1 sig fig