Buildings use double-pane windows because _____. The air space between the panes acts as a good insulator
they only allow cooler air to enter the building
the additional glass acts as a good insulator
the air between the panes acts as a good conductor

sliding

This is the answer

The energy of the light with a wavelength of 415 nm is not sufficient to remove an electron from a silver atom in the gaseous phase.

The energy and wavelength of light are related by the formula given below:

From the data provided:

E = (6.63 × 10^-34 × 3.0 × 10^8 m/s)/4.15 × 10^-7 m

E = 4.79 × 10^-19 J

Energy of light is 4.79 × 10^-19 J

Compared with the ionization energy of silver, the energy of the light is far less.

Therefore, the energy of the light with a wavelength of 415 nm is not sufficient to remove an electron from a silver atom in the gaseous phase.

Learn more about about ionization energy and energy of light at: https://brainly.com/question/14596067

In science, a statement that can be mathematically modeled based on repeated experimental observations, that describes some phenomenon of nature, is called a scientific law. A scientific law is a descriptive statement that summarizes a pattern observed in nature, typically expressed as a mathematical equation or formula, which describes the behavior of a particular natural phenomenon under certain conditions. Scientific laws are generally considered to be well-established and reliable, based on the repeated empirical evidence and testing that supports them.

2.23 moles of propane react when 294 g of CO₂ is formed .

Moles is a unit which is equal to the molar mass of an element.

A reaction is given

C₃H₈ +50₂ → 3CO₂ + 4H₂O

Grams of CO₂ formed = 294 gm

In moles = 294 /44 = 6.68 moles.

Let x be the moles of C₃H₈ is x

Mole ratio of CO₂ to C₃H₈ = 3 : 1

so

6.68 /x = 3/1

x = 6.68 /3 = 2.23 moles

Therefore 2.23 moles of propane react when 294 g of CO₂ is formed .

To know more about Moles

https://brainly.com/question/26416088

#SPJ1

To calculate the actual heat, I'd use calorimetric to weigh a sample mass. I 'd calculate the mass of a material sample. At a specified temperature, I will heat the material. I should position the heated material inside a calorimeter for coffee cup containing an initially established mass of water. I 'd wait for the weather to stabilize and then measure the difference in weather. To assess the sum of energy consumed, I will use the increase in water temperatures. For measure real heat I will use the sum of energy per material, weight, and temperature shift.

-------------------------------

Hope this helps!

Brainliest would be great!

-------------------------------

With all care,

07x12!

Answer:

-I would use calorimetry to determine the specific heat.

-I would measure the mass of a sample of the substance.

-I would heat the substance to a known temperature.

-I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature.

-I would wait for the temperature to equilibrate, then calculate temperature change.

-I would use the temperature change of water to determine the amount of energy absorbed.

-I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.

The heat was required for his temperature change  26752 J.

given that :

volume : 100 mL

The initial temperature = 23 °C

The final temperature = 87 °C

ΔT = 87  °C - 23  °C = 64 °C

density = mass / volume

mass = density × volume

         = 1 × 100

         = 100 g

the specific heat expression is given as :

Q = m c ΔT

where,

specific heat capacity , c = 4.18 J/g °C

mass of water , m = 100 g

change in temperature , ΔT = 64 °C

Q = 100 × 4.18 × 64

Q = 26752 J

Thus, the initial temperature of 100.0 ml of water was 23 °C . the water was then heated to 87 °C .heat (in j) was required for this temperature change is 26752 J.

To learn more about specific heat here

https://brainly.com/question/21041726

#SPJ4

Answer:

D

Explanation:

Most of the fluids have some resistance to their movement due to viscosity. The gases also exhibit viscosity. The molecules that make up olive oil are larger as compared to alcohol. So olive oil has high viscosity. The correct option is D.

The viscosity of a fluid can be defined as the measure of a fluid's resistance to flow. It can also be known as the measure of a fluid's thickness or its resistance to the objects passing through it.

A fluid with high viscosity resists motion because of its strong intermolecular forces which gives high internal friction. The fluids can flow easily if they have very little intermolecular force of attraction. The SI unit of viscosity is poiseiulle (PI).

Here the molecules which make up the olive oil are found to be shorter than those which make up alcohol. So the oilve oil molecules have more resistance to sliding past one another.

Thus the correct option is D.

To know more about viscosity, visit;

https://brainly.com/question/30759211

#SPJ3

The mass of a block of ice that has the dimensions of 5cm height, 6cm long, and 10cm in width and a density of 30 grams / c m³ is 9000 g.

given that :

density = 30 g/ cm³

height of block = 5cm

length of block = 6cm

width of block = 10 cm

volume of the block is calculated by the following formula :

volume = length × width × height

volume = 6 cm × 10 cm × 5 cm

volume = 300 cm³

now, the density of the block is given by :

Density = mass / volume

mass = Density × volume

mass = 30 g/ cm³ × 300 cm³

mass = 9000 g

Thus, The mass of a block of ice that has the dimensions of 5cm height, 6cm long, and 10cm in width and a density of 30 grams / c m³ is 9000 g.

To learn more about Density here

https://brainly.com/question/10786454

#SPJ1

The resistance of the copper wire is 0.1039 Ω.

In calculating the resistance of a wire, the formula below can be used.

Resistance = (Resistivity*Length of wire)/(Cross-section Area)

The resistivity of copper wire is 1.72 x 10-8 Ωm. The length of the wire is 20.0 m and the area of the wire is 3.3103x10-6 square meters. The area of the wire is calculated by using the formula below.

Cross-section area= (π/4)(diameter)^2

Cross-section area=(π/4)(2.053 mm or 2.053x10-3 m)^2

Cross-section area= 3.3103x10-6 square meters

Calculating for the resistance of the wire:

Resistance= (1.72x10-8 Ωm * 20.0 m)/( 3.3103x10-6 m2)

Resistance=0.1039 Ω

For more information regarding resistance, please refer to the link https://brainly.com/question/17055655.

#SPJ4

The molar mass of a nonionic substance can be calculated using Raoult's law. According to the law, the vapor pressure of a solution is equal to the mole fraction of the solute multiplied by the vapor pressure of the pure solvent.

In this case, the mole fraction of the solute is 0.2 and the vapor pressure of the pure solvent (water) is 18 mm. Therefore, the vapor pressure of the solution is 0.2 x 18 = 3.6 mm. Since the vapor pressure of the solution is 6 mm lower than the vapor pressure of the pure solvent, the difference between the two is 6 - 3.6 = 2.4 mm.

According to Raoult's law, the mole fraction of the solute is equal to the mole fraction of the solvent multiplied by the difference between the vapor tension of the pure solvent and the vapor tension of the solution. Therefore, the molar mass of a nonionic substance can be calculated as follows: molar mass = 0.2 x 2.4 x 18 / 100 = 0.864 g/mol.

Learn more about   vapour pressure at:

https://brainly.com/question/2693029

#SPJ1

The diagrams show the arrangements of carbon atoms in diamond and in graphite. The diamond is sp³ hybridized and have tetrahedral shape while graphite is sp² hybridized and is hexagonal ring shaped structure.

Diamond containing carbon atoms are strongly bonded chemically with other four carbons. The carbon atoms are sp³ hybridized and make percept tetrahedral shape. Diamond used in jewelry makin g. they are used by surgeons in the cataract surgery. diamond is hard, used for cutting or drilling rock.

Graphite containing carbon atom are form the weak bond with weak forces. the carbon are sp² hybridized and make a hexagonal ring shape structure. The force in graphite in weak that makes it useful material.  it is used as lubricant. it is used in pencil. used in making electrodes.

The diagrams show the arrangements of carbon atoms in diamond and in graphite. The diamond is sp³ hybridized and have tetrahedral shape while graphite is sp² hybridized and is hexagonal ring shaped structure.

To learn more about diamond and graphite here

https://brainly.com/question/22856672

#SPJ1

The volume of the gas at standard conditions (STP) would be approximately 0.6939 L, which is equivalent to 6.939 x 10⁻¹ L as rounded to three significant figures.

The volume of a gas at standard conditions (STP), we can use the ideal gas law equation:

PV = nRT

Where:

P is the pressure of the gas

V is the volume of the gas

n is the number of moles of gas

R is the ideal gas constant (0.0821 L·atm/(mol·K))

T is the temperature of the gas in Kelvin

Standard conditions (STP) are defined as a temperature of 0°C (273.15 K) and a pressure of 1 atm (101.3 kPa).

Given:

Pressure (P) = 20.00 kPa

Temperature (T) = -40.00°C = -40.00 + 273.15 = 233.15 K

Volume (V) = 3.000 L

The volume at standard conditions, we need to convert the given pressure and temperature to the appropriate units and then calculate the volume.

Step 1: Convert pressure to atm

20.00 kPa = 20.00 kPa * (1 atm / 101.3 kPa) ≈ 0.197 atm

Step 2: Convert temperature to Kelvin

T = 233.15 K

Step 3: Apply the ideal gas law equation to find the number of moles (n)

PV = nRT

n = (PV) / (RT)

n = (0.197 atm * 3.000 L) / (0.0821 L·atm/(mol·K) * 233.15 K) ≈ 0.0038 mol

Step 4: Apply the ideal gas law equation to find the volume (V) at standard conditions (STP)

PV = nRT

V = (nRT) / P

V = (0.0038 mol * 0.0821 L·atm/(mol·K) * 273.15 K) / 1 atm ≈ 0.6939 L

To learn more about standard conditions (STP) refer here:

https://brainly.com/question/31609879#

#SPJ11

In the event that a thermometer breaks, the most important action to take is to pick up the broken glass and dispose of it properly.

You should also clean the area to ensure that there are no remaining pieces of glass. Additionally, it is important to tell the teacher about the accident right away and not try to save the red alcohol or pay for a replacement thermometer, as this is not necessary.

Calling 911 is not necessary, unless someone is injured by the broken thermometer. When cleaning up a mercury spill, it is important to use caution and protective gear, such as gloves, goggles, and a face mask, to reduce the risk of exposure to mercury vapors. You should also make sure to keep any children and pets away from the spill area.

Learn more about thermometer:

https://brainly.com/question/29503787

#SPJ4

The mass of calcium chloride (\(CaCl_{2}\)) used is 174.23 g, and the mass of water used is 323.57 g.

To prepare the solution of \(CaCl_{2}\), some amount of \(CaCl_{2}\) and water is mixed. It has a mixture with 35.0 percent calcium chloride by mass, and the total mass of the mixture is 497.8 g.

The mass percent of \(CaCl_{2}\) in the solution is:

Mass percent of \(CaCl_{2}\) = 35.0%

A solution of \(CaCl_{2}\) in water forms a mixture that is 35.0% calcium chloride by mass, which implies:

The mass percent of water = (100 - 35)% = 65%

The total mass of the mixture = 497.8 g

Thus, mass of \(CaCl_{2}\):

= Mass percent of \(CaCl_{2}\) × Total mass of the mixture/100

= 35.0/100 × 497.8 g= 174.23 g

Mass of water:

= Mass percent of water × Total mass of the mixture/100

= 65.0/100 × 497.8 g= 323.57 g

Therefore, the mass of \(CaCl_{2}\) and water used in the mixture are 174.23 g and 323.57 g, respectively.

For more information about mass of calcium chloride refers to the link: https://brainly.com/question/21091614

#SPJ11

carbon monoxide: CO

water:H2O

salt:NaCl

copper: Cu

The mass percent of NaHCO₃ in an Alka Seltzer tablet is approximately 32.15%.

To calculate the mass percent of NaHCO₃ in an Alka Seltzer tablet, we need to know the mass of NaHCO₃ and the mass of the entire Alka Seltzer tablet. Let's assume that the mass of an Alka Seltzer tablet is 3.40 g, and that it contains 1.00 g of NaHCO₃.

Using the formula for mass percent, we can calculate:

mass percent = (mass of NaHCO₃ / mass of Alka Seltzer) x 100

mass percent = (1.00 g / 3.40 g) x 100

mass percent = 29.41%

Therefore, the mass percent of NaHCO3 in an Alka Seltzer tablet is approximately 29.41%. However, this calculation assumes that the only ingredient in the tablet is NaHCO₃, which is not true. In reality, Alka Seltzer tablets contain other ingredients as well, so the actual mass percent of NaHCO₃ in a tablet may differ from this calculated value.

To know more about mass percent, refer here:

https://brainly.com/question/30400742#

#SPJ11

Gentian violet, a dye used in DNA gel electrophoresis, exhibits a yellow color in strongly acidic solutions and turns purple in solutions with higher pH levels, such as neutral or basic solutions. This color change aids in the visualization of DNA fragments during the gel electrophoresis process.

Gentian violet is a common dye used in DNA gel electrophoresis to stain DNA bands. It is a cationic dye that binds to DNA molecules, making them visible under UV light. Gentian violet appears yellow in strongly acidic solutions and purple in solutions with a higher pH. During electrophoresis, the DNA is separated by size and charge, resulting in distinct bands on the gel. Gentian violet stains these bands, allowing scientists to visualize the DNA fragments. However, excessive use of gentian violet can damage DNA, so it is important to use it in moderation. In summary, gentian violet is a vital tool for DNA analysis, but its use must be carefully controlled to prevent any negative effects on the DNA samples.
To know more about gel electrophoresis visit:

https://brainly.com/question/30791630

#SPJ11

The substance heats up relatively quickly means less energy needed for the rise in temperature. Therefore, the substance is having low specific heat.

Of all liquids, water has the highest specific heat capacity. The amount of heat that one gram of a substance needs either absorb or lose in order to change its temperature by one degree Celsius is known as specific heat. A compound with "low specific heat" will raise its temperature considerably more quickly than a compound with "high specific heat." J/kg C or J/g C are the units for specific heat. While substances with (high or low) particular heats will be more challenging to heat up, substances with (high or low) specific heats will heat up readily.

To learn more about specific heat capacity visit:https://brainly.com/question/28302909

#SPJ4

Answer:

Definition of Genetic Material

Well, your genetic material known as deoxyribonucleic acid (DNA) is the reason. DNA is the hereditary material found in the nucleus of eukaryotic cells (animal and plant) and the cytoplasm of prokaryotic cells (bacteria) that determines the composition of the organism.

Answer:

The extract is boiled with FeSO4 and acidified with concentrated H2SO4. The appearance on Prussian blue colour indicates the presence of nitrogen

Explanation:

PLS mark it brainliest

The atoms of various elements on the periodic table have different numbers of protons.

However, the atomic number of an element is equal to the number of protons it contains in the nucleus.

1. The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains.

2. If an oxygen atom with 8 electrons, 8 protons, and 9 neutrons, this means that there are 8 protons in the nucleus, the atomic number is equal to the number of protons.

Therefore the atomic number for an element oxygen with 8 protons is 8.

3. The element in the periodic table with 7 protons, 7 neutrons, and 5 electrons is nitrogen

4. The atomic composition of carbon-14 reveals that carbon-14 contains 6 protons and 8 neutrons.

An atom can be defined as the smallest particle of an element which can take part in a chemical reaction.

So therefore, the atoms of elements on the periodic table of elements have different numbers of protons.

Learn more about atomic composition ( protons, neutrons and electrons of elements):

https://brainly.com/question/1805828

#SPJ1

Answer:

fluorine its fluorine

When balancing a chemical reaction, you can only change the coefficients or numbers in front of the chemical formulas. The goal of balancing a chemical equation is to ensure that the number of atoms of each element on both sides of the equation is equal.

Coefficients are used to represent the number of molecules or moles of a substance in a chemical equation. By adjusting these coefficients, you can balance the equation by making the number of atoms of each element the same on both sides.

However, you cannot change the subscripts within a chemical formula when balancing a reaction. The subscripts represent the number of atoms of each element within a molecule or formula unit and are fixed for a given compound. Changing the subscripts would result in a different compound with different properties.

In summary, when balancing a chemical reaction, you can only change the coefficients in front of the chemical formulas to achieve the balance of atoms on both sides of the equation.

know more about balancing a reaction click here;

https://brainly.com/question/12299665

Answer: Id answer it but i think your copy and paste got corrupted!

Explanation:

Sunlight, the answer is sunlight or water. I do believe its sunlight. Hope this helps.

The value of x in the figure is

An angle is a geometric figure formed by two rays or line segments that share a common endpoint. This common endpoint is called the vertex of the angle, and the two rays or line segments that form the angle are called its sides.

Angles are measured in degrees, and a full circle contains 360 degrees. Angles can be classified based on their measure. A right angle measures exactly 90 degrees, an acute angle measures less than 90 degrees, and an obtuse angle measures more than 90 degrees but less than 180 degrees.

The figure consist of angel which is an acute angle, an acute angle are angles less than 90 hence 55 is the possible value

Learn more about angles at:

https://brainly.com/question/25770607

##SPJ1