IT WILL STALK YOU IN THE WOODS AT NIGHT...
Some trees have purple leaves. The purple colour is a mixture of coloured pigments.
Plan an experiment to extract and separate the coloured pigments present in the purple leaves.
You are provided with some purple leaves, sand, ethanol and common laboratory apparatus.
Answer:
blue and red
Explanation:
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The wall of an industrial furnace is constructed from 0.15-m-thick, fireclay brick having a thermal conductivity of LZ W/m.K. Measurements made during steady state operation reveal temperatures of 1400 and 1150 K at the inner and outer sur- faces, respectively. What is the rate of Teat loss through a wall that is 0.5 m by 1.2 m on a side?
Answer:
The rate of heat loss through the wall is 1700 watts.
Explanation:
The complete statement of the problem is:
The wall of an industrial furnace is constructed from 0.15-m-thick, fireclay brick having a thermal conductivity of 1.7 W/m·K. Measurements made during steady state operation reveal temperatures of 1400 and 1150 K at the inner and outer sur- faces, respectively. What is the rate of heat loss through a wall that is 0.5 m by 1.2 m on a side?
Given that wall of the industrial furnace is under steady conditions of heat transfer and whose configuration is a flat element, we use the equation of conductive heat transfer rate ([tex]\dot Q[/tex]), measured in watts:
[tex]\dot Q = \frac{k\cdot w\cdot h}{l}\cdot (T_{i}-T_{o})[/tex]
Where:
[tex]k[/tex] - Thermal conductivity, measured in watts per meter-Kelvin.
[tex]w[/tex] - Width of the wall, measured in meters.
[tex]h[/tex] - Height of the wall, measured in meters.
[tex]l[/tex] - Thickness of the wall, measured in meters.
[tex]T_{i}[/tex] - Inner surface temperature, measured in Kelvin.
[tex]T_{o}[/tex] - Outer surface temperature, measured in Kelvin.
If we know that [tex]k = 1.7 \,\frac{W}{m\cdot K}[/tex], [tex]w = 1.2\,m[/tex], [tex]h = 0.5\,m[/tex], [tex]l = 0.15\,m[/tex], [tex]T_{i} = 1400\,K[/tex] and [tex]T_{o} = 1150\,K[/tex], the steady state heat transfer is:
[tex]\dot Q = \left[\frac{\left(1.7\,\frac{W}{m\cdot K} \right)\cdot (1.2\,m)\cdot (0.5\,m)}{0.15\,m} \right]\cdot (1400\,K-1150\,K)[/tex]
[tex]\dot Q = 1700\,W[/tex]
The rate of heat loss through the wall is 1700 watts.
The rate of heat transfer is 1700 W
Heat Transfer:Given that the wall of the industrial furnace is under steady conditions of heat transfer.
The conductive heat transfer rate is given by:
[tex]\frac{Q}{t}=\frac{kA\Delta T}{d}[/tex]
here Q/t is the rate of heat transfer
A is the area,
d is the thickness of the wall here,
ΔT is the temperature difference, and
k is the thermal conductivity
Now,
area of the wall A = 0.5×1.2 = 0.6 m²
d = 0.15 m
k = 1.7 W/mk
and ΔT = 1400 - 1150 = 250K
So,
[tex]\frac{Q}{t}=\frac{1.7\times0.6\times250}{0.15}\\\\\frac{Q}{t}=1700\;W[/tex]
Learn more about heat transfer:
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what happens Cotton socks are rubbed against a wool carpet
Answer:
Static electricity
Explanation:
Because the friction is creating heat and static.
Answer:
it generates static:)
HELPPPP If you observe a blue light emitted during the flame test, what would the wavelength of the light be?
Steven and Joey are sent to the main office to pick up materials fo science class. Steven picks up a box that contains 40.0g of styrofoam. Joey picks up a box that contains 40.0g of marbles. On the way back to class, the boys begin to argue over whose bo is heavier. Steven thinks he has the heavier box. Joey thinks his box is definitely heavier than Steven's. 1. Which boy is correct? EXPLAIN!!!!
Answer:
I NEED HELP PLZZZZZZZZZZZZZ
Explanation:
Answer: Their both 40.0g, they're the same weight bot boys are wrong
Explanation:
What always happens during a chemical change?
Answer:
In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change
LOTS OF POINTS FOR WHOEVER ANSWERS THIS
Place the elements Lithium (Li), Beryllium (Be), and Potassium (K) in order from lowest electronegativity energy to the highest. Explain with details and use the Coulomb's Law to back up your statement
You should probably rephrase this:
According to Coulomb's Law, as the number of protons in an atom increases (or atomic number), the nuclear energy of atoms will increase, pulling electrons closer.
I think the order would be Be, Li, K but feel free to check online before you submit any work with this.
An lonic compound contains a single metal cation and a single non-metal atom. What's the structure of this molecule? Is this molecule polar or non-polar?
A. Trigonal planar, polar
B. Linear, non-polar
C. Trigonal planar, non-polar
D. Linear, polar
What is the ratio between the mass of nitrogen and oxygen in N2O3?
Please explain and give the formula
Answer:
12:7
Explanation:
To Determine: To calculate the formula of the unknown binary compound of oxygen and nitrogen and to ratio in the next compound of the series using given data.Answer:The formula of the unknown compound .The ratio for atoms of oxygen to nitrogen inis .The mass ratio of oxygen to nitrogen in next member of the series of compounds is .Explanation:The mass ratio of toinis .The mass ratio of toin theunknown compound is .The atomic mass of the oxygen is .The atomic mass of the nitrogen is .The mass ratio of to in a molecule can be represented as: …… (1)Here,is the number of atoms of the oxygen in the molecule.is the mass of an atom of oxygen.is the number of atoms of the nitrogen in the molecule.is the mass of an atom of nitrogen.For unknown compound, substitutefor , for and for mass ratio in equation (1).The ratio of atoms of oxygen to nitrogen is , therefore, the expected formulas of the unknown compound is and . If the unknown compound is in a series with then the formula of the unknown compound and the formula for the next member of the series is .The ratio for atoms of oxygen to nitrogen inis .For , substitute 5 for , for , 2 for and for in equation (1).The mass ratio of oxygen to nitrogen in next member of the series of the compounds is .
How many particles are in 0.15 moles of Francium ?
How many valence electrons are in a highly reactive metal that is explosive with
water?
A).7
B).2
C).1
D).5
The combustion of magnesium in the air produces the oxide of magnesium. The name of the compound is magnesium oxide (MgO).
Write the balanced chemical equation for the combustion reaction.
Identify the number of elements and the number of atoms present in the chemical formula.
calculate the number of atoms in 52g of He.
Answer:
Number of atoms in 52g of He is 7.829X10^24.
Explanation:
Solution,
Given,
No of mole of atoms (NA) = 6.023x10^24.
Mass ogiven helium=52g
Atomic mass of helium=4
Lets do sep by step,
1) No. of atom in 52g of He.
= NAxmass/At.mass
= 6.023X10^23x52/4
= 7.829 x 10^24.
How did energy from inside of the earth cause a boat to end up on top of a building
The energy built up in the earth could have caused a tectonic plates movement. The movement could have made a tsunami and moved the boat. The impact could have caused the boat to move up to the top of a building.
Which of the following is the biggest ionic radius? Na+ or Na?
Answer:
Na
Explanation:
Which sentence best explains the observed trend in atomic radius as you
move down the periodic table?
O A. The more core electrons an atom has, the smaller the atomic
radius.
OB. The more energy levels that are occupied by electrons, the larger
the atomic radius.
C. The more paired electrons there are, the smaller the atomic radius.
O D. The more neutrons a nucleus has, the larger the atomic radius.
Answer:
B
Explanation:
The more energy levels that are occupied by electrons, the larger
the atomic radius.
The more energy levels that are occupied by electrons, the larger
the atomic radius. Hence, option B is correct.
What is the atomic radius?The atomic radius is calculated by measuring the distance between the nuclei of two identical atoms bonded together.
In general, the atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remain constant.
Hence, the observed trend in atomic radius as you move down is that the more energy levels that are occupied by electrons, the larger
the atomic radius.
Learn more about the atomic radius here:
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A certain chemical reaction releases 850 J of
energy. Convert this quantity to calories.
Help me plz.
Answer:
203.155 calories
Explanation:
Given that,
Energy released by a certain chemical reaction is 850 J.
We need to convert the energy into calories.
We must know the relationship between Joules and Calories.
1 calorie = 4.184 Joules
1 Joule = 0.239006 calorie
Now,
850 Joule = 203.155 calories
So, 850 J of energy is equivalent to 203.155 calories.
which of the following is not an indicator that a chemical change had occured?
a - color change occurs
b - the solid chemical dissolves in the liquid chemical
c - a temperature change results
d - bubbles are formed
thank you!
Explanation:
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Answer:
B - this does not indicate chemical change
What is the product of NO2+NaOH ?
Explanation:
i hope i have been useful buddy.
good luck ♥️♥️.
how many inches are in 20.12 cm
Answer:
About 7.9 inch
Explanation:
how many atoms are in FeS₂?
Surface model,we used a supercell of
16.1106×16.1106×18.0 And a model of a 3 × 3
9 atoms..
if this answer helps you plz mark as brainlist..But, don't report my answer..Didymo threatens the North Georgia trout populations. What is the best way Georgians can help prevent the spread of didymo?
Answer: Avoid wading in Georgian waters to catch trout and don't move from one body of water to the next without changing and sanitizing waders.
Explanation:
Convert 67.2 L CO at STP to moles
To Find :
The STP moles of 67.2 L CO.
Solution :
We know, molar volume at STP is used to converted into moles by :
1 moles = 22.4 L STP
So, number of moles in 67.2 L CO is :
[tex]n=\dfrac{67.2}{22.4}\\\\n = 3 \ moles[/tex]
Therefore, number of STP moles are 3.
Hence, this is the required solution.
Look at the map. Predict what will happen in Florida due to the jet stream.
A.) cooler temperature
B.) sea breeze
C.) warmer temperature
D.) land brezze
Florida's east coast climate causes its winter temperatures to remain higher and its summer temperatures to remain lower than those of other southeastern states. Therefore, option A is correct.
What is climate ?Climate is a region's averaged long-term weather pattern over a period of time, usually 30 years. More precisely, it is the average and variation of climatic variables over a period of time that can range from a few months to many millions of years.
At that height, the jet stream, which is high overhead, affects the wind and pressure. This influences elements closer to the surface, such as zones of high and low pressure, and as a result, influences the weather.
The ground is sinking all along Florida's Atlantic and Gulf coasts. Sea level along the Florida coast is anticipated to increase one to four feet in the following century if the oceans and atmosphere continue to warm. Rising sea levels inundate dry areas and marshes, degrade coastlines, and make coastal flooding worse.
Thus, option A is correct.
To learn more about climate, follow the link;
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explain why the two argon atoms are attracted
to each other.
What kind of change is burning paper
Answer:
Burning paper is a chemical change where paper burns to form ash and also CO2
Answer:
Burning paper is a chemical change
Explanation:
As when a paper is burnt its physical properties and structure completely changes . And it converts into an ashes.
When does carbon dioxide absorb the most heat energy
Answer:
Carbon dioxide absorbs the most heat energy during SUBLIMATION
Explanation:
Carbon dioxide absorbs the most heat energy during SUBLIMATION
Calculate the number of moles of gas in the following at STP: 45.6 L of H2 gas
Answer:
2.04 mol
Explanation:
At STP, 1 mole = 22.4 L
45.6 L of H2 * (1 mole of H2 / 22.4 L ) = 2.04 mol
Use the periodic table to predict which element has the most metallic character.
A) silicon
B) sodium
C) sulfur
D) thallium
Answer: A silicon
Explanation:
