how light behaves as it relates to its nature (waves or particles).
Light travels as
and interacts with matter as

To prepare 2.00 L of 0.250 M NaOH from solid NaOH, dissolve 20 g of NaOH in 2.00 L of water to form 0.250 M NaOH solution.

A stock solution is a solution with high concentration of any particular solute and it is used for obtaining moderate quantities of solute using small volumes.

Sodium hydroxide is a strong electrolyte with the molecular formula NaOH. Sodium hydroxide completely dissociates in aqueous solution to produce Na⁺ and OH⁻ ions. Hence, sodium hydroxide is considered to be a strong base. Sodium hydroxide, also called caustic soda, is highly hygroscopic in nature.

Firstly, we will prepare a stock solution, by placing n grams of NaOH in a liter volumetric flask. Then add 100 mL dilute water and make up the volume of solution to 1 liter.

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Considering the definition of STP conditions, you obtain:

A. 44 grams of N₂ will ocupy at STP 35.168 L.

B. 0.25 moles of NH₃ will ocupy at STP 5.6 L.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

In this case, you have:

You can apply the following rule of three to know the number of moles of N₂: if 28 grams of the compound are contained in 1 mole, 44 grams are contained in how many moles?

number of moles of N₂= (44 grams× 1 mole)÷ 28 grams

number of moles of N₂= 1.57 moles

Now, you can apply the following rules of three to know the volume of N₂ and NH₃:

volume of N₂= (1.57 moles× 22.4 L)÷ 1 mole

volume of N₂= 35.168 L

volume of NH₃= (0.25 moles× 22.4 L)÷ 1 mole

volume of NH₃= 5.6 L

Finally, you obtain:

A. 44 grams of N₂ will ocupy at STP 35.168 L.

B. 0.25 moles of NH₃ will ocupy at STP 5.6 L.

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The statement that correctly compares a hypothesis and a theory is that a hypothesis is a prediction for a specific situation, while a theory is used to make predictions for many similar situations (option B).

A hypothesis is a tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further observation, investigation and/or experimentation.

On the other hand, a scientific theory is a coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed.

A theory is simply a hypothesis confirmed by observation or experiment.

Therefore, the statement that correctly compares a hypothesis and a theory is that a hypothesis is a prediction for a specific situation, while a theory is used to make predictions for many similar situations.

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Temperature changes in sleeping bag is the  dependent (outcome) variable in her experiment.

Variables are the major manipulating factor which is compulsorily added to the experiment in order to get accurate results like person's eye color, its value can change from brown to blue depending  on different factors.

An independent variable can not change by the presence of other factor where as dependent variable depend on other variable and can be influenced by other components.

Control variables are the constant which only determine the accuracy of the experimental result and prevent bias from the experiment.

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The grams of iburofen does such a tablet contain 800 mg =   0.8g Ibuprofen

1 g = 10^-3g = .001g

Ibuprofen has  800 mg doses in over-the-counter analgesic

800g = 800 × .001

        = 0.8g

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All processes for which the temperature stays constant are described by Boyle's law.

Boyle's law is expressed as p1 * V1 = p2 * V2, where p1 and V1 are starting pressure and volume, respectively. The ultimate values of these gas parameters are p2 and V2.

Boyle's law formula can be stated in a variety of ways, depending on the parameter we want to estimate. Let's imagine we wish to determine the pressure that results from changing a gas' volume under isothermal conditions. The Boyle's law equation thus reads: p2 = p1 * V1 / V2 or p2 / p1 = V1 / V2.

As we can see, the final-to-initial pressure ratio is the opposite of the volume ratio.

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The number of moles in each sample will be 0.391 moles, 30.7 moles, 0.456 moles, and 1350 moles

The number of moles of a substance is the ratio of the mass of the substance to the molar mass.

In other words; mole = mass/molar mass.

Thus:

                                   = 0.391 moles

                                         = 30.7 moles

                                          = 0.456 moles

                                                 = 1350 moles

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Percent of gold and copper are 88.2 and 11.8

Red gold is a gold-copper alloy used to make jewelry .

Let the mass  of gold be m1

Let the mass of copper be m2

We are given that m1+m2 =8.97 g

We know that volume is the ratio of mass to density

Thus

m1/d1  + m2/d2 = 0.528 cm3

where d1 and d2 is the density of gold and copper

m1/19.3 + m2/8.96 = 0.528

8.96m1 +19.3 m2 = 0.528 x 19.3 x 8.96 = 91.305

putting m1 = 8.97 - m2

8.96 ( 8.97 - m2 ) + 19.3 m2 = 91.305

80.3712 - 8.96m2 + 19.3 m2 =91.305

10.34 m2 = 91.305-80.3712

m2 = 10.9338 /10.34

      =1.0537gm

m1=8.97-1.0537

    =7.91gm

Therefore, percent of gold = 7.91/8.97 x 100 =88.20%

                 percent of copper = 100-88.2=11.8%

Therefore, percent of gold and copper are 88.2 and 11.8

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The planet that would have a diameter of approximately 12 cm is Saturn.

A scale model is a model which is used to represent another object using a given scale.

Scale models can be used to make small object bigger or larger objects smaller.

Considering the scale model of the planets where  1 centimeter (cm) is equal to 10,000 kilometers (km);

1 centimeter = 10,000 kilometers

12 centimeter = 1.2 × 10⁵ kilometers

The planet with a diameter of approximately 1.2 × 10⁵ kilometers is Saturn.

In conclusion, scale models are used to model objects.

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Answer: C. Biochemistry

Explanation:

Merriam-Webster Dictionary defines Biochemistry as:

"chemistry that deals with the chemical compounds and processes occurring in organisms"

“Definition of BIOCHEMISTRY.” Merriam-Webster.com, 2018,   www.merriam-webster.com/dictionary/biochemistry.

The mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL  is 37.5g.

Density is the measurement of quantity or mass per unit of volume in a particular substance. Its units are  grams per centimeters cube (g/cm³) or kilograms per liter (kg/l)

⇒  g/cm³ can also be written as g/mL because 1cm³ = 1mL

Volume is a measure of space. When measuring the volume of a liquid which is sometimes referred to as capacity, the units liters (L) and milliliters (mL) are used.

Mass is defined as amount of matter present in a body. Gram (g) and kilogram (kg) are the common units.

density = mass / volume

mass = density × volume

         =  2.5 g/mL  ×  15 mL.

         =  37.5 g

Since density is given in g/mL and volume is given in mL, we can keep the unit of mass in grams (g).

Thus we can conclude that the mass of liquid is 37.5g

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Mole of the gas should be removed to get a volume of 2.56ml is 10.26 mol.

Given data,

Volume₁ = 5.32ml

number of moles at 5.32ml n₁ = 24.37mol

Molarity = ?

Volume₂ = 2.56ml

number of moles = ?

First to find molarity of gas using formula,

M = nV

where,

M is molarity

n is numbers of mole

V is volume

So, putting the values of volume₁,

M = 24.37mol x 5.32ml

M = 129.65 mol/ml

So again to get moles of second volume in same formula we have,

M = nV

So,

n = M / V

n₂ = 129.65 / 2.56ml

n = 50.64mol

So,

n₂ - n₁ = 50.64mol - 24.37mol

n = 26.27

So,

mole of the gas removed = 26.27 / 2.56

mole of the gas removed = 10.26mol

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Density of copper is 8.92 g/cm3.

The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol(p), although Latin letter D may also be used.

Given:

weight of copper = 12.11 g

Volume =  2.13 cm * 0.79 cm * 1.14 cm

            = 1.918 cm3

As we know that ,

Density = mass / volume

  d = m/v

 d  = 17.11 / 1.918

density = 8.92 g/cm3

Density of copper is 8.92 g/cm3.

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Answer:

Personally I think thatthr answer could be 5.38853503%, you can round it however you need.

Explanation:

There's a value of error between the noted square meters and the actual room's area. which is 4.23. Using the formula to get the percentage of error is getting the value (78.5 - 74.27 = 4.23) and dividing it by 78.5. Then just multiply it by 100 to get the percentage.

19 protons, 20 neutrons and 18 electrons.

The protons are determined by the atomic number (19).

therefore, number of proton = 19

The protons and neutrons together make up the atomic mass.

P + N = 39

19 + N = 39

number of neutrons = 39 - 19 = 20

A neutral atom has an equal number of protons and electrons. The negative charge is the same as the positive charge. The number of electrons represents the negative charge. The charge of this ion is +1. Therefore, find the negative charge.

= -19 + 1 = -18

therefore, number of electrons are 18.

Thus, no. of proton = 19

no. of neutrons = 20

no. of electrons = 18

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Considering the defintion of area of a rectangle and definition of density, you obtain the following areas and densities:

a. the area of the rectangle is 9×10⁻¹ cm².

b. the area of the rectangle is 5×10⁻²cm².

c. the density of the substance is 3×10⁶ g/cm³.

d. the density of the substance is 0.2 g/cm³.

A rectangle is a flat geometric figure with four sides, of which two sides that are opposite parallel to each other have the same length and the remaining two have another length.

The area of a rectangle is the product of the two contiguous sides of the rectangle:

Area of a rectangle= a×b

where a and b are the measures of the two sides.

Density  is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

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 the rectangle has:

Then, the area of the rectangle can be calculated as:

Area of the rectangle= 3×10¹ cm× 3×10⁻² cm

To multiply numbers in scientific notation, you multiply the numbers that are not powers of 10 and add the exponents that are powers of ten. In this case:

Area of the rectangle= (3× 3)×10¹⁻² cm²

Area of the rectangle= 9×10⁻¹ cm²

Finally, the area of the rectangle is 9×10⁻¹ cm².

In this case, you know that the rectangle has:

Then, the area of the rectangle can be calculated as:

Area of the rectangle= 1×10³ cm× 5×10⁻¹ cm

Solving

Area of the rectangle= (1× 5)×10³⁻¹ cm²

Area of the rectangle= 5×10⁻²cm²

Finally, the area of the rectangle is 5×10⁻²cm².

In this case, you know:

Replacing in the definition of density:

density= 9×10⁵ g÷ 3×10⁻¹ cm³

Solving:

density= 3×10⁶ g/cm³

Finally, the density of the substance is 3×10⁶ g/cm³.

In this case, you know:

Replacing in the definition of density:

density= 4×10⁻³ g÷ 2×10⁻² cm³

Solving:

density= 0.2 g/cm³

Finally, the density of the substance is 0.2 g/cm³.

In summary, you obtain the following areas and densities:

a. the area of the rectangle is 9×10⁻¹ cm².

b. the area of the rectangle is 5×10⁻²cm².

c. the density of the substance is 3×10⁶ g/cm³.

d. the density of the substance is 0.2 g/cm³.

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Answer:

243.60 miles

Explanation:

Multiply miles per gallon times number of gallons.  Both starting numbers are given to two decimal places so our answer is as well.

Answer:

C

Explanation:

it would be a lot more easier if you could show the animation

But nevertheless your answer would be

C Four seasons occur on Earth.

Answer: The answer is letter C.

Explanation:

There are four seasons on our planet Earth . These four seasons are, Spring, Summer, Autumn, And Winter (my personal favorite.)

These four seasons only occur, based on which side of the sun our continent is on. Yes we could literally be facing the sun, but the sun isn’t really directing heat now. (Don’t fact check that.) but anyways, hopefully this helps. And remember, the earth take 365 days to orbit the sun. Which is 12 months, and each season has 3 months each to roam the earth.

The pure gas has a pressure of 0.573 atm.

Pressure is the amount of force applied perpendicularly to an object's surface divided by the surface area across which it is applied. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.

The definition of the standard atmosphere, or atm, as a unit of pressure is 101325 Pa. It is occasionally used as a standard pressure or a reference pressure. It roughly corresponds to the average atmospheric pressure at sea level on Earth.

based on the specified value;

we know that,

P(t)=P(water)+P(pure gas)

where,

P(t)=TOTAL PRESSURE OF THE GAS

P(water)= Vapour pressure of water

P(pure gas)=Pressure of pure gas

GIVEN;

P(pure gas)=P(t)-P(water)

                  =(453.0-17.5)

                  =435.5 torr

or P(pure gas)=435.5/760

                       =0.573

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The majority of elements are found in mixtures of two or more isotopes in nature. Every element's isotope has a set mass and a natural percent abundance. These isotopes' masses in their respective abundances must be reflected in the element's mass.

These are the reasons for different values of weighted average atomic mass.

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Answer:

ddddxddddddddddddddddddddddddd

Increases in sewage waste were responsible for decreasing oxygen levels in the lake

Humans does have the impact on the environment in several ways. Common effects includes lowered water quality, elevated pollution and greenhouse gas emissions, depletion of natural resources and contribution to global climate change.

As global temperatures increasing , weather patterns on earth will dangererously change. While some areas will have longer growing seasons, others will become drought wastelands as water will decrease in vast areas, turning once floral regions into deserts. The elevation will impact weather patterns, provoking more intense hurricanes in both size and frequency, as well as intensifying and prolonging droughts and heat waves. But air pollution not only  just effect the environment . The evidence is increasing that poor air quality and rising temperatures are ruining delicate ecosystems, even led to increased asthma and cancer rates in humans.

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Answer: theoretical scientist

Explanation:

Answer:

23.1%

Explanation:

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

                                   mass of solute (g)
Weight Percent  =  ----------------------------------  x  100%
                                  mass of solution (g)

In this case, the solute is sugar and the solution is the sugar and water. You can find the weight percent by plugging the given values into the equation and solving. The final answer should have 3 sig figs like the given values.

mass of solute = 15.0 g

mass of solution = 15.0 g + 50.0 g = 65.0 g

                                   15.0 g solute
Weight Percent  =  -------------------------  x  100%
                                     65.0 g soln

Weight Percent  =  0.231  x  100%

Weight Percent  =  23.1%

If the pulling force of 225 N each is assigned a positive value, the net force of the scenario will be 50 N and the slab will move upward.

The net force acting on an object is the resultant force. It is the sum of all the forces acting on the object.

The forces acting on the slap concrete are three, namely:

These forces are acting in opposite directions. The gravitational force is acting downward while the pulling forces by the construction workers are acting upward.

Now, the pulling forces of the construction workers are assigned positive values. Since the gravitational force acts in opposition to the pulling forces, it means the gravitational force will be assigned a negative value.

Thus, the resultant force can be calculated as:

225 + 225 - 400 = 50 N

The resultant force is 50 N and positive. This means the slab will move in an upward direction.

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Answer: the last one

Explanation: it is the only one that makes sense  \

sorry if its wrong

Answer:

378.196

Explanation:

235 miles = 378.196 Kilometers