Answer:
The heat required, to burn a hole 15 cm in diameter through the iron door is 34,370.050 kJ
Explanation:
The information given on the door are;
The thickness of the door, t = One-meter
The diameter of the hole to be burnt out, d = 15 cm = 0.15 m
The latent heat of fusion of iron, [tex]H_f[/tex] = 247 kJ/kg
The density of iron, ρ = 7.874 g/cm³ = 7874 kg/m³
The volume of the iron to be melted off, V = π·d²/4 × t
∴ V = (π × 0.15²/4) × 1 ≈ 0.01767145867
The volume of the iron to be melted off, V ≈ 0.01767145867 m³
The mass of the iron to be melted off, m = ρ × V
∴ m = 7874 kg/m³ × 0.01767145867 m³ ≈ 139.145066 kg
The mass of the iron to be melted off, m ≈ 139.15 kg
The heat required, to melt the mass of iron at the melting point temperature and burn a hole 15 cm in diameter, ΔH, is given as follows;
ΔH = [tex]H_f[/tex] × m
∴ ΔH = 139.15 kg × 247 kJ/kg = 34,370,050 J = 34,370.050 kJ
The heat required, to burn a hole 15 cm in diameter through the iron door ΔH = 34,370.050 kJ.
Explain why the difference between the wet bulb temperature and the dry bulb temperature is always 0C when the relative humidity is 100%??
HELPPP!
Answer:
The dry bulb temperature is the ambient air temperature that is measured by regular thermometers, while the wet bulb temperature is measured by thermometers that are wrapped in wicks. The greater the wet bulb depression, the greater the felt effect is on the discharge air temperature.
Explanation:
How many atoms of hydrogen are in 10.25 grams of
water?
name any two
chemical fertilizers rich in potassium
Explanation:
Fertilizers are chemically synthesized plant nutrients.
Nitrogen (N), Phosphorus (P) and Potassium (K) are macronutrients and are required in large amounts by plants. So, farmers use fertilizers in order to supply these nutrients. NPK 15:15:15 , NPK 20:20:20, NPK 15:30:15 are examples of fertilizers used to supply N, P, K to crops.
Explanation:
1.Potassium Nitrate(KNO3)
2.Potassium Sulphate(K2SO4)
They provide potassium to plants for making their roots and shoots healthy.
Select the correct answer.
Which of the following is true for a heating curve?
Ο Α.
It shows how the pressure of a substance changes when heated.
OB.
It shows how the temperature of a substance changes when heated.
OC.
It shows how the volume of a substance changes when heated.
It shows how the mass of a substance changes when heated.
OD
Reset
Next
Answer:
the answer is b: it shows how temperature of a substance changes when heated
WILL GIVE BRAINLIEST PLEASE HELPP!!!
Answer:
I think C...................
Four 22.4 samples of nitrogen are bottled at STP and placed into environments with varying temperature. Which environment yield a sample the the greatest kinetic energy?
A)100k
B) 303k
C)273 k
D)200k
Calculate the molarity of 0.060 moles of sodium bicarbonate (NaHCO3) in 1500. mL of solution.
Answer: 0.040 mol/l
Explanation: Molarity c = n/V (Concentration)
c = 0.060 mol / 1,5 l = 0,040 mol/l
are the bonds of OCl2 polar?
Answer: OCl2 is polar because the two O-Cl bond dipoles don't cancel each other.
What is the volume of 16.0 g of SO2 (g) at STP?
Answer:
Explanation:
At STP 1 mole of an ideal gas = 22.4 L.
Assuming SO2 (sulfur dioxide) acts as an ideal as, we have 16 g SO2 x 1 mol/64 g = 0.25 moles SO2
0.25 moles x 22.4 L/mole = 5.6 liters
GUYS PLEASE HELP ME
giving brainliest
2
Hope this helps :)
...............................
Match the parts of the element box as is making a periodic table key
Answer:
10 is the atomic number
Ne is the chemical symbol
Neon is the element name
20 is the atomic mass
Hello everyone, I got stumped by this question:
Do you agree or disagree with the claim, A change to any gas in the atmosphere affects energy absorbed by the surface in the same way.
a
agree
b
disagree
Could you help me figure this out?
Answer:b
Explanation:
What are some facts about Radon something that is unique and relatively unknown by the general population???? Helpppppp helpppppp
Answer: Radon is radioactive
Explanation: thats all i know
Type of reaction in NaOH + KNO3 → NaNO3 + KOH
Answer:
It is a combustion reaction
Explanation:
anybody still woke ???
Answer:
yep.. I am wide awake here.
yep
ExPlAnAtIoN:
yezs and nozs
What is the freezing point of a solution that has 5.0 moles of Nal in 1250 g of water? (K = 1.86°C/m; molar
mass of water = 18.0 g)
I need help with this Asap. Best answer gets brainiest, also how is your day.
10. Aqua means "water" or "a light blue color." Marine refers to the sea. Use this information
to determine what the gemstone aquamarine might look like.
Determine what the gemstone aquamarine might look like?
Answer:
[tex] \huge\blue{ \mid{ \underline{ \overline{ \tt ♡ AQUAMARINE ♡ }} \mid}}[/tex]
=> The colour of this stone is usually a pale greenish blue, owing to the presence of iron impurities. Stones that are treated with heat look more blue than green. On the Mohs scale of hardness, aquamarine ranges between 7.5 and 8 making it a relatively hard gemstone.
=> The best way to identify a real aquamarine stone is by looking at its colour. In its natural form, they have a pale blue colour, which is similar to seawater. They may have a slight green or yellow tint as well. Naturally occurring gems have excellent clarity and transparency.
=> The hardness of the stone is another feature you can use to identify the stone. Aquamarine stones are hard and they don’t get scratches easily. However, they can easily scratch glass and other such surfaces. So, if you find visible scratches on the stone, rethink your decision to buy it.
=> Most faceted aquamarine stones are clean to the eye and clear of any inclusions. However, translucent and opaque aquamarine is also available. These are usually fashioned into cabochons or beads. In some cases, inclusions may appear as parallel tubes. Such stones can be crafted to show a cat’s eye. Stones with cat’s eye and star effect are rare and highly priced.
What is the overall equation for the covalent bond in H2O . Is it H2 + O2=H2O OR. H2 + O = H2O
Answer:
The answer is in the photo
Explanation:
I hope that is useful for you :)
Can someone help me with this??
Answer:
A. Oil is to heavy to mix with water
HOPE THIS HELPS
-Todo <3
Explanation:
Answer:
It should be C - Water can only mix with polar molecules.
Explanation:
Oil is non-polar and water is polar.
Which solution is more concentrated show work and EXPLAIN your reasoning
Solution A
2 L of water
135.75 g of MgO
or
Solution B
2 L of water
119.6 g of CaCl2
Answer:
Solution A
Explanation:
Solution A
1 mole of MgO = 24 + 16 = 40 g
? moles of MgO = 135.75g
[tex]\frac{135.75}{75}[/tex] = 1.81 moles
1.81 moles of MgO is in 2 liters of water
? moles of MgO is in 1 liter of water
[tex]\frac{1.584}{2}[/tex] = 0.905moles/liter or 0.905M
Solution B
1 mole of CaCl₂ = 40 + 35.5 = 75.5 g
? moles of CaCl₂ = 119.6g
[tex]\frac{119.6}{75.5}[/tex] = 1.584moles
1.584 moles of MgO is in 2 liters of water
? moles of MgO is in 1 liter of water
[tex]\frac{1.584}{2}[/tex]= 0.792moles/liter or 0.792M
Isaiah rolls a tennis ball along the ground. Which of the following best explains what will happen if forces act on the ball?
Answer:
what are the following
Explanation:
what are the options?
Answer:
the ball will stop moving
Which of the following could be the hypothesis supported by an investigation that demonstrates the law of conservation of mass in relation to chemical reactions?
A. If the reaction obeys the law of conservation of mass, then mass will be the same before and after the reaction.
B. If the reaction obeys the law of conservation of mass, then mass will increase after the reaction.
C. If the reaction obeys the law of conservation of mass, then mass will be different before and after the reaction.
D. If the reaction obeys the law of conservation of mass, then mass will decrease after the reaction.
According to the law of conservation of mass, mass is neither created nor destroyed in a chemical reaction. If the reaction obeys the law of conservation of mass, the mass before and after the reaction will be the same.
What does the law of conservation of mass?Any element's mass at the start of a reaction will equal its mass at the end of the reaction. Accounting for all reactants and products in a chemical reaction results in the same total mass at any point in time in any closed system.
When coal, for example, is burned, the carbon atom transforms into carbon dioxide. The carbon atom undergoes transformation from solid to gas, but its mass remains constant.
According to the law of conservation of mass, the amount of mass that enters a chemical reaction in the form of reactants must equal the amount of mass that exits the reaction process in the form of products. This is only possible in a closed system. For example, if 2g of reactant A reacts with 32g of reactant B, the mass of the product AB formed is 34g.
To learn more about Law of conservation of mass, refer to:
brainly.com/question/24783543
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What is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days?
Answer: A- 1 day
Explanation: I really hope that helped. BYE!!
1 day is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days
Para saber si se lleva a cabo una reacción donde un metal desplaza a otro metal de su sal u otro compuesto, es preciso:
Answer:
Explanation:
¡Hola!
En este caso, dado que las reacciones de desplazamiento simple se llevan a cabo cuando un metal desplaza a otro metal de su sal u otro compuesto, es preciso tener en cuenta la serie de reactividad de los metales que se muestra en el archivo adjunto.
Así, es mandatorio que el metal con el que la sal original reacciona, sea más reactivo que el catión de la misma, de modo contrario, la reacción tendría lugar. Por ejemplo, si el sodio reacciona con cloruro de zinc, al este primero estar más arriba en la serie, quiere decir que es capaz de desplazar el zinc en el cloruro original y así se formaría zinc metálico y cloruro de sodio.
¡Saludos!
What did you know for sure after one Test? Two tests? Three tests?
Answer:
I knew that I learned something and passed that test. And that is all I want to do.
Explanation:
Answer:
vaiana and I have been working with our team since we been through
Which choices are uses of electrical energy?
Choose all that apply.
A. creates useful gases
B. supplies energy for heat
C. provides power to lights
D. creates a magnetic force
Answer:
option A,B and C.
are the options I chose.
The electrical devices include those that are needed to power appliances and those that are used in daily life. In order to make things operational, they need power or energy.
Electrical energy is taken from the movement of electronically charged particles. These when collide produce energy that can be used for heating, lighting, etc.Hence the option C is correct.
Learn more about the choices are uses of electrical energy.
brainly.com/question/20580527
PLS HELP FAST!!!! Determine the new concentration if you dilute 500mL of a 1.9M solution of NaCl to 1L.
Answer:
M2 = 0.95M
Explanation:
M1V1 = M2V2
(1.9)(0.5) = M2(1)
M2 = 0.95M
What equation is used to calculate atomic mass?
WARNING!!!! NO LINKS OR YOU WILL BE REPORTED!!!!
Answer:
Average atomic mass = f1M1 + f2M2 +… + fnMn where f is the fraction representing the natural abundance of the isotope and M is the mass number (weight) of the isotope. The average atomic mass of an element can be found on the periodic table, typically under the elemental symbol.
How would the graph differ if you were to draw a graph to compare temperature with
time taken for the reaction to take place?