Answer:
direction
Explanation:
A P E X
How much energy is required to melt 2 kg of copper? Use the table below and
this equation: Q = mLfusion
A. 125.6 kJ
B. 9460 kJ
C. 414 kJ
D. 4730 kJ
Answer:
C. 414 kJ
Explanation:
Given parameters:
Mass of copper = 2kg
Unknown:
Amount of energy required to melt the copper = ?
Solution:
To solve this problem, we use:
Q = m L
m is the mass
L is the latent heat of fusion of copper = 207kJ/kg
So;
Q = 2 x 207 = 414kJ
Which equation is balanced in an acidic solution?
Answer:
I think C but it could be D
Explanation:
I would say go for C
The diagram represents the path of a ball that has been thrown upward. Discuss how the kinetic energy (KE), gravitational potential energy (GPE), and total mechanical energy (ME) change between points A (where the ball is thrown from), B (the highest point reached by the ball), and C (where the ball hits the ground). Ignore friction between the ball and the air. (3 points)
Answer:
Gravitational potential energy: [tex]GPE_{B}>GPE_{A}>GPE_{C}[/tex]
Kinetic energy: [tex]KE_{B}<KE_{A}<KE_{C}[/tex]
Total mechanical energy: [tex]ME_{A}=ME_{B}=ME_{C}[/tex]
Explanation:
The gravitational potential energy is directly proportional to height ([tex]GPE_{B}>GPE_{A}>GPE_{C}[/tex]). Since there are no non-conservative forces, the total mechanical energy is conserved ([tex]ME_{A}=ME_{B}=ME_{C}[/tex]) and the total mechanical energy is the sum of gravitational potential and kinetic energies. Then:
[tex]GPE_{A} + KE_{A} = GPE_{B} + KE_{B} = GPE_{C} + KE_{C}[/tex] (1)
If we know that [tex]GPE_{B}>GPE_{A}>GPE_{C}[/tex], then we conclude the following inequation for the kinetic energy:
[tex]KE_{B}<KE_{A}<KE_{C}[/tex] (2)
PLZ HELP!!!!!asapnow
Answer:
Friction of wind against the ocean surface
Balance the following chemical equation by providing the correct coefficients.
Na + H2O ———— NaOH+H2
Please help!!!!!!!!
Answer:
2, 2, 2, and 1
Explanation:
I put that in and it was correct.
how many moles of sodium are present in a sample of sodium having a mass of 137 g? (molar mass is 23.0g)
Answer:
5.95 moles
Explanation:
No of moles = given mass / molar mass
No of moles = 137/23
= 5.95 moles
1. What happens when an electric current is applied to a tube filled with a gas, like neon, electrons...
Answer:
When an electric current is passed through a gas, the gas emits light. Neon signs operate in this way; a tube having an electrode at each end is filled with a gas at low pressure and a high voltage (generally in the range of 1000 to 5000 volts) is applied to the electrodes.
Explanation:
6/14and3/7 answer 6/11and9/16answer 5:6=10:12answer
your question was incomplete.............. you haven't mentioned any required information
Give a real-world example of an energy transformation that uses two of the following forms of energy: chemical, mechanical, nuclear, gravitational, radiant, electrical, thermal (heat), and/or sound.
Answer:
Chemical Energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy. Chemical energy is converted to thermal energy when we burn wood in a fireplace or burn gasoline in a car's engine.
MARK BRAINLIST PLZ NEEDS ONE MORE
Explanation:
Dry ice placed in room temperature water causes a lot of bubbling in the
water. When the bubbles burst, you see white cloudy-looking wisps. What are the
white clouds made of?
Answer:
carbon dioxide I beleive.
Explanation:
dry ice is frozen liquid carbon dioxide and when it melts it gives off carbon dioxide gas.
Which is the most common type of precipitation?
hail
rain
sleet
snow
Answer:
rain I think
Explanation:
Precipitation mostly relies on the main source water, that is how snow hail, and other cool weather form are created. So rain I may be wrong.
,
Rain is the most common type of precipitation. Therefore, the correct option is option B among all the given options.
What is precipitation?Any liquid and frozen water which condenses in the atmosphere then falls to the ground is referred to as precipitation. Rain, sleet, as well as snow are only a few of its various manifestations. Precipitation is one of three main processes that make up the global water cycle, together with evaporation and condensation.
Water vapor in the clouds condenses into increasing-sized droplets of water, forming precipitation. The drips hit the ground when they are sufficiently hefty. The water droplets can freeze to produce ice if a cloud is colder, as it would be at higher elevations. Rain is the most common type of precipitation.
Therefore, the correct option is option B.
To learn more about precipitation, here:
https://brainly.com/question/29762381
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The percent composition of carbon in acrylonitrile is
a 5.690%
b 67.89%
С
47.90%
d 22.646%
Answer:
67.89
Explanation:it’s right
The percent composition of carbon in compound of acrylonitrile is 22.646%.
What is percent composition?Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates mass of element to mass of compound as,mass of element/mass of compound×100.
Percent composition helps in elemental analysis of compound which is useful in analysis of ores also. It helps in making solutions while performing the titrations. It helps in prediction of chemical formula which can be predicted by mass and molar mass of an element.
The compound acrylonitrile has a molar mass 53.06 g/mole and that of carbon is 12 g/mole thus, percent composition of carbon in compound of acrylonitrile is 12/53.06×100=22.646%.
Thus, the percent composition of carbon in compound of acrylonitrile is 22.646%.
Learn more about percent composition,here:
https://brainly.com/question/17505281
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A closed container is the best way to measure the volume of a
A. gas
B. liquid
C. solid
D. Both A and B are correct.
Answer:
A closed container is the best way to measure the volume of a liquid
If we react 5.4g of sodium chloride with an unknown amount of fluorine gas, we produce 4.9g of sodium fluoride and 3.7g chlorine gas. How much fluorine was consumed in the reaction?
Answer:
4.43 g
Explanation:
The reaction between sodium chloride and flourine gas is given as;
NaCl + F2 --> NaF + Cl2
From the stochiometry of the equation;
1 mol of NaCl reacts eith 1 mol of F2 to form 1 mol of NaF and Cl2
Mass of 1 mol of F2 = 38g
Mass of 1 mol of sodium flouride, NaF = 42g
This means 38g of flourine reacted with NaCl to form 42g of NaF
xg of F2 would form 4.9g of NaF
38 = 42
x = 4.9
x = 4.9 * 38 / 42
x = 4.43 g
What does the salinity of seawater represent?
The concentration of salt dissolve in the ocean
The concentration of all dissolved chemicals in the ocean
The volume of salt in the ocean
the mass of salt in the ocean
Answer:
Salinity is a measure of the 'saltiness' of seawater, or more precisely the amount of dissolved matter within seawater.
Can somebody Please Help
Answer:
5425440 μm
Explanation:
From the question given above,
Length (in ft) = 17.8 ft
Length (in μm) =?
Next, we shall convert 17.8 ft to in. This can be obtained as follow:
1 ft = 12 in
Therefore,
17.8 ft = 17.8 ft × 12 in / 1 ft
17.8 ft = 213.6 in
Next, we shall convert 213.6 in to cm. This can be obtained as follow:
1 in = 2.54 cm
Therefore,
213.6 in = 213.6 in × 2.54 / 1 in
213.6 in = 542.544 cm
Finally, we shall convert 542.544 cm to μm. This can be obtained as follow:
1 cm = 10⁴ μm
Therefore,
542.544 cm = 542.544 cm × 10⁴ μm / 1 cm
542.544 cm = 5425440 μm
Therefore, 17.8 ft is equivalent is equivalent to 5425440 μm
How many atoms of beryllium are equal to 0.39 moles of beryllium?
Answer:
2.35 x 10²³atoms
Explanation:
Given parameters:
Number of moles of Be = 0.39moles
Unknown:
Number of atoms = ?
Solution:
To solve this problem:
1 mole of a substance contains 6.02 x 10²³ atoms
0.39 mole of Be will contain 0.39 x 6.02 x 10²³ = 2.35 x 10²³atoms
The children in the class are more than 10 years old
Answer:
The children have spent 5 of there years playing and having the time of there lives and the other 5 years are spent losing and gaining brain sells!
hope this helps:)
so sorry if this is wrong!
Please help due soon fill in the blanks will give brainliest
Answer:
Proton has positive charge (+) and located in nucleus
Electron has negative charge (-) and located in electron cloud
Neutron has neutral charge (0) and located in nucleus
Lucy volunteers at an animal shelter, and she takes care of an orange tabby 1 point
cat and her kittens. Some of the kittens have orange markings, but some
have gray markings. What units of genetic material determine how living
things look?
Answer; the answer is variations
The unit of genetic material that determines how living things look is called variations, look below for more description.
What are genetic variations?Hereditary variety alludes to contrasts among the genomes of individuals from similar species. A genome is all the innate data — every one of the qualities — of a creature. Hereditary variety is the distinction in DNA successions between people inside a populace.
For example, the human genome contains somewhere close to twenty and 25 thousand qualities.
Find more information about Genetic variations here:
brainly.com/question/14926046
A student claims that a large percentage of water on Earth is immediately available to drink. Is he correct? Why or why not?
Answer:
No, the student is not correct. The earth may have a lot of water... but not every part of water is drinkable. Most water is filled with bacteria and or viruses making it not suitable to drink! :)
Explanation:
HOPE THIS HELPS! BRAINLIEST? :)
Why do scientist use the scientific method
Answer:
B
Explanation:
scientists always look for evidence
Answer:
Yea its B
Explanation: The person above me legit toke the answer out of my mouth
What is the percent composition of nitrogen in N 2 O
Answer:
28 %
Explanation:
Mass mass N2O = 28 + 16 = 44 mass nitrogen = 2 x 14 = 28 % nitrogen Chemistry.
The substance that cannot be broken down into a simpler form by ordinary chemical means is called a __ ?
Answer:
Elements
Explanation:
An element is any substance that cannot be broken down into simpler form by ordinary chemical means.
Elements are distinct substances that cannot be split up into simpler substances. .
Such substances consist of only one kind of atom. There are over hundred elements known till date. Elements are made up of unique atoms. In a chemical reaction, elements combines and rearranges.
30g of solute is dissolved in 100g of water. Calculate its % (m/m) concentration.
Answer:
23%
Explanation:
How can calcium oxide change directly to limewater?
Wants equation and observation
Answer:
Lime(Calcium Oxide) is a white solid with strongly basic properties.Lime reacts readily with water to produce slaked lime,which is the chemical compound calcium hydroxide.....
When carbon dioxide gas is passed through or over limewater,it turns milky due to the formation of calcium carbonate.
Give the name of one of the 3 common acids used in chemistry
Answer:
Common strong acids include hydrochloric acid, sulfuric acid, phosphoric acid, and nitric acid. Common weak acids include acetic acid, boric acid, hydrofluoric acid, oxalic acid, citric acid, and carbonic acid.
Which ones are elements, compounds I’ll give brainliest.
can someone please help me, i'll give you a 5 star rating and brainliest answer
Which of the following is true about the electron configurations of the noble gases?
A) The highest occupied s and p shells are completely filled.
B) The highest occupied s and p shells are partially filled.
C) The electrons with the highest energy are in a d sublevel.
D) The electrons with the highest energy are in an f sublevel.
