C because weight has the force of gravity pulling you down
Which property is not important when selecting a material to use as a light bulb filament?
Answer:
When selecting a material to use as a light bulb filament, there are several important properties to consider. However, one property that is not important in this context is color. The color of the filament does not affect its functionality or performance as a light source.
The primary function of a light bulb filament is to produce light when an electric current passes through it, and its color does not impact this process. The color of the light emitted by the bulb is determined by other factors, such as the gases or coatings inside the bulb.
When selecting a material for a light bulb filament, important properties to consider include:
1. Resistance: The material should have high electrical resistance to prevent excessive current flow and overheating.
2. Melting Point: The material should have a high melting point to withstand the high temperatures generated by the electric current passing through it.
3. Conductivity: The material should have good electrical conductivity to efficiently carry the current and produce light.
4. Durability: The material should be durable enough to withstand repeated heating and cooling cycles without breaking or deforming.
5. Cost: The material should be cost-effective to produce in large quantities, as light bulbs are commonly used in everyday applications.
By considering these properties, manufacturers can select the most suitable material for the filament, ensuring optimal performance and longevity of the light bulb.
Calculate the mass in grams of 3.94×1024 molecules of formaldehyde. The chemical formula for formaldehyde is CH2O.
Answer:
Mass in grams of formaldehyde = 196.51 g
Explanation:
No. of molecules of formaldehyde = [tex]3.94 \times 10^{24}[/tex]
Moles is related with number of molecules as:
[tex]mol=\frac{No.\ of\ molecules}{Avogadro's\ no.}[/tex]
Avogadro's no. = [tex]6.02 \times 10^{23}[/tex]
moles of formaldehyde
[tex]=\frac{3.94\times 10^{24}}{6.02\times 10^{23}} \\=6.544\ mol[/tex]
Molar mass of formaldehyde = 30.03 g/mol
Molar mass is related with mass as:
Mass = Moles × Molar mass
= 6.544 × 30.03
= 196.51 g
Your boss asks you to design a room that can be as soundproof as possible and provides you with three samples of material. The only information on each sample's label is the material's coefficient of absorption. The coefficient of absorption listed on Sample A is 30%, on Sample B is 47%, and on Sample C is 62%. When your boss asks for your choice and the reasoning behind it, what would you tell him?
sample c because it has the highest absorption
Which choice best describes the specific heat of water compared with that of metals?
A. The specific heat of water is less than the specific heat of metals.
B. The specific heat of water is about the same as the specific heat of metals.
C. The specific heat of water is greater than the specific heat of metals.
D. The specific heat cannot be measured for water.
Answer: Specific heat capacity is the measurement of how much energy (in J) has to be added to 1 kg of a substance to increase the temperature of that substance by 1 o C. Simply, substances with a low specific heat capacity heat up quickly - but then they lose their heat quickly. Substances with a high specific heat capacity require a large amount of heat to be added to change their temperature - but then they hold their heat much longer.
Explanation: Think of heating a pot of soup on the stove and stirring it with a metal spoon. If you leave the spoon sitting in the pot for even a few minutes and you return, the spoon will be hot enough to burn your hands - and the soup will feel only slightly warmer. This happens because the specific heat capacity of the metal spoon is much lower than that of the water in the soup. Water has the highest specific heat capacity of any liquid.
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The specific heat of water is greater than the specific heat of metals, which means water requires more energy to change its temperature than metals.
Explanation:The best choice to describe the specific heat of water compared to that of metals is option C. The specific heat of water is greater than the specific heat of metals. This means water requires more heat energy to change its temperature compared to metals. For example, if we have equal masses of water and metal and apply the same amount of heat, the temperature of the metal will increase more quickly than that of the water because water has higher specific heat.
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is potassium a metal, nonmetal, or metalloid?
Yes, potassium is a metal
A lead cylinder (density=11.3 g/mL) is placed in a graduated cylinder that originally had a volume of water in it equal to 73.2 mL. After addition of the lead, the volume of the water in the cylinder reads 95.6 mL. What is the mass
Density = mass/volume.
You are given the density and asked to find the mass. So, you need to find the volume. According to Archimedes Principle, the volume displaced by an object is equal to the volume of that object. So, in this problem the volume of the lead is the same as the volume of water that it displaced. That would be
95.6 ml - 73.2 ml = 22.4 ml.
Density = mass/volume
11.3 g/ml = mass/22.4 ml
mass = 11.3 g/ml x 22.4 ml = 253 g (to 3 significant figures)
The problem deals with the concept of density and requires working out the change in volume when a lead cylinder is added to water. The mass of the lead cylinder is found by multiplying the density by the change in volume, providing an answer of approximately 253.2 grams.
Explanation:The problem you've outlined can be solved using the concept of density. Density is defined as mass per unit volume. In your case, the volume changes when the lead cylinder is added to the water providing the volume of the lead cylinder. This change in volume is calculated as 95.6 mL - 73.2 mL = 22.4 mL. Now, since density is mass/volume, we can find the mass by multiplying density by volume: (11.3 g/mL) * (22.4 mL) = 253.2 grams. So the mass of the lead cylinder is approximately 253.2 grams.
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Mathematical representation of Charles law
Charles' Law is a special case of the ideal gas law. It states that the volume of a fixed mass of a gas is directly proportional to the temperature. This law applies to ideal gases held at a constant pressure, where only the volume and temperature are allowed to change.
Charles' Law is expressed as:
Vi/Ti = Vf/T f
where
Vi = initial volume
Ti = initial absolute temperature
Vf = final volume
T f = final absolute temperature
It is extremely important to remember the temperatures are absolute temperaturesmeasured in Kelvin, NOT °C or °F.
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2C(s) + 2H2(g) → C2H4(g): ΔH = +52.4 kJ/mol
Which statement about this reaction is correct?
26.2 kJ of energy are absorbed for every mole of carbon reacted
Explanation;ΔH is the enthalpy change which is given by subtracting the energy of reactants from the energy of products.That is; ΔH = energy of products - energy of reactantsIn this case, it means that C2H4 has more energy than the the reactants. 52.4 J of energy to be precise, this energy is absorbed during the reaction.However, Two moles of Carbon require that much energy, thus one mole will require only 26.2 to react.Answer: D) 26.2 kJ of energy are absorbed for every mole of carbon reacted.
there are several ways to express solution concentration dilute concentrated ppm molarity molality normality all of these have one thing in common they describe the
B: quantity of solute with a specific volome of solvent.
Have a Nice Day :)
Answer: quantity of solute dissolved in a given quantity of solvent
Explanation:-
Dilute : is defined as a solution in which amount of solvent is more than the amount of solute.
Concentrated: is defined as a solution in which amount of solute is more than the amount of solvent.
ppm: ppm is defined as the concentration when 1 part of the solute is dissolved per 1 million of the solution.
Molarity: Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
Molality : Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.
Normality: Normality of a solution is defined as the number of ram equivalents of solute dissolved per Liter of the solution.
What does LeChatelier’s principal mean
Answer: a principle stating that if a constraint (such as a change in pressure, temperature, or concentration of a reactant) is applied to a system in equilibrium, the equilibrium will shift so as to tend to counteract the effect of the constrain
What is the percent by volume concentration of 58.0 mL of water in 920 mL of an acetic acid-water solution?
Answer:
= 5.93 %
Explanation:
Volume % of a component is given by the formula;
= (Volume of the component/Total volume of the solution) x 100
Volume of the component = 920 mL
Total volume of the solution = 920 + 58 = 978 mL
Therefore;
Cvolume % = 58 mL/978 mL × 100%
= 5.93 %
Select the correct equalities for the units shown.
1 cm = 10 mm
1 ft = 3 yd
100 m = 1 cm
1 kg = 1,000 g
12 in = 1 ft
Enter the correct answer for each unit conversion.
mm = 5 cm
48 in =
ft
ft = 12 yd
2.5 m =
cm
1,000 mL =
L
Answer
1. 1cm=10mm, 1kg=1000g and 12in=1 ft
2. 50mm=5cm
48 in =4ft
36ft=12 yd
2.5m=250cm
1000mL= 1 L
Explanation
if 1cm=10mm then 5cm=?
5×10=50mm
if 12 in =1ft then 48in=?
48/12 =4 ft
if 1m=100cm, then 2.5m=?
2.5×100= 250cm
and when know from capacity that 1000mL is equivalent to 1 liter.
how much water do you need to add 10mL of a solution HCL with pH 3 to change the pH to 6
Who cares? unless you wanna be a scientist when you get older. this is pointless
10 mL more water is needed to do so...
Which equation correctly shows how you could calculate [OH-] from [H+]
Answer:
[OH⁻] = 10⁻¹⁴/[H⁺].
Explanation:
∵ [H⁺][OH⁻] = 10⁻¹⁴.
∴ [OH⁻] = 10⁻¹⁴/[H⁺].
Answer:
[tex]Kw = [H+][OH-][/tex]
Explanation:
For a given solution H+ refers to the hydrogen ion concentration and is indicative of the acidity of the solution. The more the [H+] concentration, higher is the acidity. Similarly, OH- refers to the hydroxide ion concentration and reflects the basicity of the solution. A solution with a higher OH- concentration is said to be basic.
The two are related by considering the dissociation of water:
[tex]H2O(l)\rightleftharpoons H+(aq)+ OH-(aq)[/tex]
The dissociation constant for water, Kw is:
[tex]Kw = [H+][OH-]\\\\where\ Kw = 10^{-14} \\\\10^{-14} = [H+][OH-]\\[/tex]
[tex][H+] = \frac{10^{-14}}{[OH-]}[/tex]
What is the polymer used in making car rear lights?
A. Perspex
B. Bakelite
C. Polystyrene
D. Polyacrylonitrite
D. Polyacrylonitrite
hope i help my bad if i'm wrong
Inferences are A. never made by scientists. B. questions that are made by studying conclusions or predictions. C. exactly the same as observations. D. conclusions or predictions that are made by studying observations.
The Answer Is D. Have A Great Day
Answer:
D
Explanation:
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Which two objects have stored energy?
a ball rolling on the ground
a small rock sitting on top of a big rock
a stretched rubber band
a stone lying on the ground
Answer:
a small rock sitting on top of a big rock
a stretched rubber band
Explanation:
A small rock sittin on the top of a big rock has stored energy because of the potential energy that it contains, as well as the stretched rubber band in all the kinetic energy that is stored in the streched rubber band and it is just about to free it as soon as what is keeping it stretched liberates it.
The molality of a solution is a measure of -
A - moles of solute per kilogram of solution
B - moles of solute per liter of solution
C - moles of solute per kilogram of solvent
D - moles of solute per liter of solvent
Answer: Its C
Explanation: I did the test and got it correct
The molality of a solution is defined as the number of moles of solute per kilogram of solvent .The correct option is C.
Molality is a measure of the concentration of a solution because it expresses the amount of solute in a given amount of solvent.It is different from the molarity which is defined as the number of moles of solute per liter of solution .
The primary advantage of using molality as a measure of concentration is that molality only depends on the masses of solute and solvent, which are unaffected by variations in temperature and pressure. In contrast, solutions prepared volumetrically .
Thus, the correct option is 'C'.
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How many copper atoms are in a pure copper statue with a mass of 120 kg ?
Step #1: Convert to grams.
120kg × (1000g ÷ 1kg) = 120000g of copper
Step #2: Convert sample mass of copper to moles by dividing sample mass to its atomic weight. Atomic weights could be found in periodic table.
120000g Cu × (1mol Cu ÷ 63.55g Cu) = 1888.277mol Cu
Step #3: Convert moles to atoms by multiplying moles to Avogadro's number.
1888.277mol Cu × (6.022x10^23 ÷ 1mol Cu) = 1.137x10^27 atoms Cu
*I attached a picture to help out with conversions.
There is 120000 grams in a pure copper statue.
Coefficients in a chemical formula provide
Answer:
The relative number of products and reactants
Explanation:
The numerical coefficients in chemical equations show the ratio of the molecules of each substance involved in a chemical reaction that is both reactants and products. The coefficients in a balanced chemical equation indicate the relative number of moles of reactants and products.Additionally, coefficients are important to prove the law of conservation of mass.In Chemistry, the coefficients in a chemical formula represent the number of molecules involved in a chemical reaction. These coefficients provide a quantitative relationship between the reactants and products of a reaction, which is part of a concept called stoichiometry.
Explanation:In a chemical formula, coefficients provide a quantitative assessment of the relationships between the amounts of substances consumed and produced by a reaction. They allow the representation of the relative numbers of different entities or chemical species involved in the reaction. This is a part of a concept called stoichiometry, derived from the Greek words stoicheion (meaning “element") and metron (meaning "measure”).
An example of this can be seen in a balanced chemical equation. Coefficients from the equation are used to derive stoichiometric factors that subsequently may be used for computations relating reactant and product masses, molar amounts, and other quantitative properties. In simpler terms, a chemical equation is a symbolic representation of a chemical reaction, and the coefficient signals the number of molecules involved in that reaction.
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Which of the following equations expresses the work-kinetic energy theorem?
Answer:
W = ΔKE = 1/2mv₂⁽²⁾ - 1/2mv₁⁽²⁾
Explanation:
Work means Change In Kinetic Energy.
Kinetic-Energy is equal to change in velocity multiplied by mass and divided by 2
∴ KE = 1/2m²
Change in Kinetic-Energy =KE₂ - KE₁
=1/2mv₂⁽²⁾ - 1/2mv₁⁽²⁾
The work-kinetic energy theorem is expressed by the equation: [tex]\[ W_{\text{net}} = \Delta KE \][/tex]. So, the correct option is: d) [tex]\( W_{\text{net}} = \Delta KE \)[/tex].
The work-kinetic energy theorem states that the net work done on an object is equal to the change in its kinetic energy. Mathematically, it is expressed as [tex]\(W_{\text{net}} = \Delta KE\)[/tex]. Here, [tex]\(W_{\text{net}}\)[/tex] represents the net work done on the object, and [tex]\(\Delta KE\)[/tex] is the change in kinetic energy.
This theorem is fundamental in understanding the relationship between the work done on an object and the resulting change in its motion.
When a net force is applied to an object, it performs work, transferring energy to or from the object. This work leads to a change in the object's kinetic energy, which is associated with its motion. If the net work is positive, the kinetic energy increases, implying an acceleration or an increase in speed.
Conversely, if the net work is negative, the kinetic energy decreases, resulting in deceleration or a decrease in speed. The work-kinetic energy theorem provides a crucial link between the concepts of work and energy in the dynamics of moving objects.
Complete Question:
Which of the following equations expresses the work-kinetic energy theorem?
a) [tex]$\mathrm{ME}_{\mathrm{i}}=\mathrm{ME}_{\mathrm{f}}$[/tex]
c) [tex]$\triangle W=K E$[/tex]
b) [tex]$W_{\text {net }}=P E$[/tex]
d) [tex]$W_{\text {net }}=\Delta K E$[/tex]
A chemical bond forms when the _____ of one element interact(s) with another element.
Atom
A chemical bond forms when the atom of one element interact(s) with an atom of another element.
Explanation;A chemical bond is an attraction between atoms, ions or molecules that enables the formation of chemical compounds.There are several types of chemical bonds, they include;Ionic bonding which involves the transfer of an electron, where one atom gains an electron while one atom loses an electron.Covalent bond which involves the sharing of electrons between two atoms. Polar bond and hydrogen bond among othersHow many grams of sucrose (C12H22O11) would be in 8.7 L of a 6.81M solution of sucrose
- please explain if able
= 20,280.25 g or 20.28 Kg
Explanation;Number of moles, n = Molarity × Volume
Molarity = 6.81 M
Volume = 8.7 L
Number of moles = 6.81 × 8.7
= 59.247 moles
Mass = Moles × Molar mass
= 59.247 × 34.2 g/mol
= 20,280.25 or
= 20.28 Kg
HELP ASAP
A red capital "L" over your home on a weather map probably indicates _____. A. rain B. clear skies C. freezing weather D. changing weather
307.0 mL of air is at 0 C. What is the volume (L) at 273 C
Use Charle's Law because we are dealing with volume and temperature.
[tex]\frac{v}{t} =\frac{v}{t}[/tex]
v₁= 3017.0 ml
t₂ = 0
v₂= ???
t₂= 273°C
Change all mL's to L because the question says "What is the volume (L)...".
3017.0 mL = 3.017 L
Change the temperature into Kelvins: Kelvin = Celsius + 273.15
0°C = 273.15 K
273°C = 546.15 K
Now you can plug it in the formula:
[tex]\frac{3.017}{273.15} = \frac{v}{546.15}[/tex]
Then, do cross multiplication.
(3.017) (546.15) = (273.15) v₂
1,647.73 = (273.15 K) v₂
Divide 273.15 on both sides
6.0296 L= V₂
The minimum energy required to start a reaction
The answer to that question would be Activation energy. If would like me to elaborate just let me know. :)
Answer: Activation energy
Explanation:
Activation energy is the minimum energy required to initiate a chemical reaction.
It is the minimum energy required to excite reactant to break bonds and react with each other in the system while creating new products.
Completion
Complete each statement.
Select the correct term to complete each sentence. There are extra terms in the list.
Coriolis effect El Niño Southern Oscillation
sea breeze thermal
land breeze hurricane
air mass tornado
wind jet stream
8. A __________________________ is created when warm air over the land rises and creates low pressure.
9. A __________________________ occurs when warmer air over the sea rises and creates low pressure.
10. The bending of air and water currents as a result of Earth’s rotation is known as the
_________________________.
11. A rising column of warm air that gliding birds and sailplanes ride is known as a _______________.
12. A large body of air with consistent temperature and moisture throughout is known as an
________________________.
13. The flow of air that occurs as a result of a pressure or temperature difference between two air masses is called
____________________.
14. A system of rotating winds around a low pressure center that has a small diameter and very high wind speeds
is called a ____________________.
15. The change in wind flow, air pressure, and thunderstorm activity in the Pacific Ocean that causes decreased
fish catches by Peruvian fishermen is known as ______________________________.
PLEASE HELP
These are the answers to the incomplete statements:
8) A land breeze is created when warm air over the land rises and creates low pressure.9) A sea breeze occurs when warmer air over the sea rises and creates low pressure.10) The bending of air and water currents as a result of Earth’s rotation is known as the Coriolis effect.11) A rising column of warm air that gliding birds and sailplanes ride is known as a thermal.12) A large body of air with consistent temperature and moisture throughout is known as an air mass.13) The flow of air that occurs as a result of a pressure or temperature difference between two air masses is called wind.14) A system of rotating winds around a low pressure center that has a small diameter and very high wind speeds is called a hurricane.15) The change in wind flow, air pressure, and thunderstorm activity in the Pacific Ocean that causes decreased fish catches by Peruvian fishermen is known as El Niño–Southern Oscillation (ENSO).What are these terms about?Land breeze: A land breeze is a wind that blows from land to sea during the night. This is because the land cools down faster than the sea at night, so the air over the land becomes denser and sinks, creating a low-pressure area. The air over the sea is warmer and less dense, so it rises to fill the low-pressure area, creating a wind that blows from land to sea.
Sea breeze: A sea breeze is a wind that blows from sea to land during the day. This is because the sea heats up faster than the land during the day, so the air over the sea becomes less dense and rises, creating a low-pressure area. The air over the land is cooler and denser, so it sinks to fill the low-pressure area, creating a wind that blows from sea to land.
Coriolis effect: The Coriolis effect is a phenomenon that causes moving objects on a rotating Earth to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This is because the Earth's rotation causes a force to act on moving objects, which deflects them to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
Thermal: A thermal is a rising column of warm air that is created when the sun heats the ground. The warm air rises because it is less dense than the surrounding air. Gliding birds and sailplanes can ride thermals to gain altitude.
Air mass: An air mass is a large body of air with consistent temperature and moisture throughout. Air masses are formed over large areas of land or sea, and they can travel long distances.
Wind: Wind is the flow of air that occurs as a result of a pressure or temperature difference between two air masses. Wind can be caused by the uneven heating of the Earth's surface, by the rotation of the Earth, or by differences in air pressure.
Hurricane: A hurricane is a large, rotating storm that forms over warm tropical oceans. Hurricanes are characterized by strong winds, heavy rain, and high waves. Hurricanes can cause extensive damage to coastal areas.
El Niño–Southern Oscillation (ENSO): El Niño–Southern Oscillation (ENSO) is a climate pattern that occurs in the Pacific Ocean. ENSO is characterized by changes in the ocean temperature and wind patterns, which can have a significant impact on weather patterns around the world. El Niño is a warm phase of ENSO, while La Niña is a cold phase of ENSO.
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Convert 23.92inHg to Torr.
= 607.568 Torr
Explanation;1 in of mercury is equivalent to 25.4 Torr
Therefore;
23.92 InHg will be equal to;
23.92 × 25.4
= 607.568 Torr
Sound waves generated in a classroom must _______ through an open doorway in order to propagate into the hallway.
diffract through an open doorway in order to propagate into the hallway.
Answer:
Diffract
Explanation:
The diffraction of sound waves is the description of how sound waves bend, change direction, as they travel around the edges of obstacles. The diffraction occurs as a result of the bending of sound waves as they find the path of least resistance to the travel path. The amount and magnitude of the diffraction occurs in proportion to the opening in the obstacle pathway. The diffraction is a property of sound that helps it bend around the corners and obstacles.
How many molecules are there in 24 grams of FeF(3)?
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 1.26×10²³ molecules are there in 24 grams of FeF[tex]_3[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
given mass of FeF[tex]_3[/tex]=24 grams
Molar mass of FeF[tex]_3[/tex] = 112.84 g/mol
mole =24 ÷ 112.84
=0.21 moles
number of molecules/atoms=number of moles × 6.022×10²³
number of molecules=0.21 × 6.022×10²³ molecules
= 1.26×10²³ molecules
Therefore, 1.26×10²³ molecules are there in 24 grams of FeF[tex]_3[/tex].
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