The amount of energy required to melt a 48.9 g sample of cobalt at its normal melting point and boiling point is given below:
the amount of heat required to melt a certain amount of a solid is called the heat of fusion. It is usually expressed in Joules per gram (J/g). Cobalt's heat of fusion is 16.06 J/g.
Thus, to determine the quantity of heat needed to melt 48.9 grams of cobalt at its normal melting point, we may employ the formula
Q=m x ΔHf. (48.9 g) × (16.06 J/g)
= 784.14 J
Ans: 784.14 J or 7.84 x 10^2J.
The amount of heat required to transform a liquid into a gas is known as the heat of vaporization. It is frequently stated in J/g. Cobalt's heat of vaporization is 375 J/g.
Thus, to determine the amount of heat required to boil 48.9 grams of cobalt at its normal boiling point, we can use the formula
Q=m x Hv. (48.9 g) × (375 J/g)
= 18,337.5 J or 1.83 x 10^4 J
Ans: 1.83 x 10^4 J.
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cientific Investigations
7
Katrina finds the following passage in a science textbook
There are many ways to conserve water. One way that people can save water is to reuse it. For example, instead of pouring
the old water from a pet's bowl down the sink, use it to water a plant. Another way to cut down on water use is to collect
rainwater A large barrel can be placed under a downspout to catch the rain. The collected rainwater can be used to wash a car
or water the lawn A third way to save water is to choose outdoor water activities wisely. Instead of playing in the sprinklers, swim
in a pool The sprinklers must run water continuously, but once a pool is filled, the water can be used again and again. One last
way to prevent water waste is to stop flushing unnecessary items down the toilet. Toilets use a lot of water when they flush. Do
not flush insects or used Kleenex down toilets. Following these suggestions will save gallons of water
What is this passage suggesting about tap water?
It has more energy than hydrogen gas
B
it is not an important resource
C. It is a limited resource
It is an unlimited resource
Answer:
C, it is a limited resource.
Explanation:
What determines how fast atoms or molecules move in substances?
1- the amount of energy (heat) they have
2- the amount of light they have
3- the amount of distance between the atoms
4- the amount of space they take up
how does the metallic character of the element change
Answer:
Metallic character decreases as you move across a period in the periodic table from left to right. This occurs as atoms more readily accept electrons to fill a valence shell than lose them to remove the unfilled shell. Metallic character increases as you move down an element group in the periodic table. This is because electrons become easier to lose as the atomic radius increases, where there is less attraction between the nucleus and the valence electrons because of the increased distance between them.
How is science related to ghost hunting?
How far can you drive in 3 hours if you constantly go 120 km/h
Answer:
If you are going at 120km per hour then, you should be able to go 360km in 3 hours.
Explanation:
Okay so, just multiply 120x3 and you get 360
also, Dividing 120/60 (How many mins are in a hour) You get 2Kilometers per min
Hope this helps!
We sprayed the flowers with water. They did not turn pink.
The fact that the flowers did not turn pink is an:
inference
interpretation
experiment
observation
i need the answer now please help me
Answer:observation
Explanation:
this is the answer because they saw it they know it is there. the flowers are pink and they saw that that’s what an observation is so the answer is an OBSERVATION
Column A 1. Reproduction: Reproduction 2. offspring: offspring 3. gamete: gamete 4. Budding: Budding 5. Binary fission: Binary fission 6. zygote: zygote 7. fragmentation/regeneration: fragmentation/regeneration 8. mitosis: mitosis 9. meiosis: meiosis Column B a.Bacteria b.Egg or sperm cell/ specialized cells c.A new living organism d.Sea star/ planarian e.Female and male create mini-me by cell division f.The original cell after egg cell and sperm cell join g.One or two parents, organisms make new offspring h.Hydra i.Healling and growth occurs in budding
Answer:
1. Reproduction: One or two parents, organisms make new offspring
2. Offspring: A new living organism
3. Gamete: female and male create mini-me by cell division
4. Budding: Hydra
5. Binary fission: Bacteria
6. Zygote: The original cell after egg cell and sperm cell join
7. Fragmentation/Regeneration: Sea star / Planarian
8. Mitosis: Healling and growth occurs in budding
9. Meiosis: Egg or sperm cell/ specialized cells
Explanation:
1. Reproduction is the process by which organisms make new offspring either sexually (involving two parents) or asexually (involving one parent only).
2. An Offspring is a new living organism
3. A gamete is a mature sexual reproductive cell, as a sperm or egg, that unites with another cell to form a new organism. It formed from female and male parents by cell division known as meiosis
4. Budding is a form of asexual reproduction in which a new offspring grows out from a part of the parent. It occurs in Hydra.
5. Biinary fission is a form of asexual reproduction which involves a separation of the parent into two new offspring. It commonly occurs in Bacteria
6. Zygote is the original cell formed after egg cell and sperm cell fuse.
7. Fragmentation/Regeneration: this is a form of reproduction in which a parent splits into fragments which are then able to develop into new organisms. It occurs in Sea star and Planarians
8. Mitosis is a form of cell division which a cell divides into two identical daughter cells with the same genetic components as the parent cell. It functions in healing and growth as well as in budding
9. Meiosis is a type of cell division that results in the production of sex cells or gametes. The number of chromosomes in the parent cell is halved and four gamete cells are produced. Egg or sperm cell/ specialized cells are produced by meiosis.
What object has the least amount of atoms
Answer:
neutron stars are made out of neutrons, so there's definitely no atoms there. The sparse matter which is between stars or between galaxies, which is the majority of the mass in the universe
Explanation:
what kind of a bond do carbon and oxygen form?
Answer:
covalent bond
Explanation:
A carbon–oxygen bond is a polar covalent bond between carbon and oxygen. Oxygen has 6 valence electrons and prefers to either share two electrons in bonding with carbon, leaving the 4 nonbonding electrons in 2 lone pairs :O: or to share two pairs of electrons to form the carbonyl functional group.
Plutonium-242 (242Pu) undergoes alpha decay to form what daughter isotope and decay particle?
Answer:
Decay. Plutonium-242 primarily decays into uranium-238 via alpha decay, before continuing along the uranium series.
Explanation:
please mark as brainlist
solve the quadratic equation 2x^2+13x=15 by method of completing the square
Answer:
x = 1, -7.5
Explanation:
2x² + 13x = 15
Divide the left side of the equation by 2
2(x² + 6.5x) = 15
Divide 6.5 by 2 and square the quotient
6.5/2 = 3.25
3.25² = 10.5625
Add 10.5625 to the left side
2(x² + 6.5x + 10.5625) = 15
Since you have a 2 outside the parentheses, you will be adding 10.5625•2 to the right side.
10.5625 • 2 = 21.125
2(x² + 6.5x + 10.5625) = 36.125
To factor (x² + 6.5x + 10.5625), add b/2 to x
b/2 = 6.5/2 = 3.25
2(x + 3.25)² = 36.125
Divide by 2
(x + 3.25)² = 18.0625
Square root.
(x + 3.25) = √18.0625
x + 3.25 = ±4.25
Subtract 3.25.
x = 4.25 - 3.25 = 1
x = -4.25 - 3.25 = -7.5
x = 1, -7.5
A sample of iron occupies a volume of 10.0 cm3 . If the density of iron is 7.9 g/cm3 , what is the mass of the sample?
Answer:
The answer is 79 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 7.9 × 10
We have the final answer as
79 gHope this helps you
A bar of copper has a mass of 216g and a volume of 24cm^3. What is the density of copper?
Answer:
The answer is 9 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 216 g
volume = 24 cm³
The density is
[tex]density = \frac{216}{24} \\ [/tex]
We have the final answer as
9 g/cm³Hope this helps you
helpppppp helpppppp helppppp
where is the diagram?
without the diagram i can't help
Answer:
1. Aorta
2. Right ventricle
3. Right ventricle
4. Right ventricle
5. Left ventricle
Explanation:
i believe these are correct because i got the same answers on my test
Round each number to two sig.figs.
13) 3.948
14) 11,561.06
15) 6,789.2
16) 112.6
17)0.00048888
18) 119.999
Answer:
13) 3.9
14) 12000
15) 6800
16) 110
17) 0.00049
18) 120
Explanation:
First we will look at the second digit of given values.
we will draw a line after second digit then we will look the digit after line.
It the digit after line which is 3rd digit is 5 or more than 5 then one will be added to the second digit.
It it is less than five then second digit remain same.
After this we will add zeros to the right till decimal point.
13) 3.948
Round to two significant figures = 3.9
14) 11561.06
Round to two significant figures = 12000
15) 6789.2
Round to two significant figures = 6800
16) 112.6
Round to two significant figures = 110
17) 0.00048888
Round to two significant figures = 0.00049
18) 119.999
Round to two significant figures = 120
Question 12 (1 point)
An ice cube with food coloring is placed in a glass of room temperature water. The
cold dye molecules begin to drop down from the ice cube to the bottom of the glass.
Which type of thermal energy is shown with the purple water in this glass?
This is an example of convection
This is an example of radiation
This is an example of conduction
Answer:
the answer is this is an example of convection
Choose the atom with the larger ionization energy. Silicon (Si) or Sulfur (S)
Answer:
silicon (Si)
Explanation:
Sulfur is known to have to smallest amount of radius, therefore silicon has the largest ionization energy.
Explain why this statement is false.“Because there is no change in composition during a physical change, the appearance of the substance will not change.”
A student estimated the volume of a liquid in a beaker as 200.0 mL. When she poured the liquid into a graduated cylinder she MEASURED the volume to be 198.2 mL. What is the percent error?
Answer:
The answer is 0.91 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual volume = 198.2 mL
error = 200 - 198.2 = 1.8
So we have
[tex]P(\%) = \frac{1.8}{198.2} \times 100 \\ = 0.90817356205...[/tex]
We have the final answer as
0.91 %Hope this helps you
whenn he said yes would go
Answer: I said god bless him
Explanation:
As liquid water boils and changes into water vapor (steam), what happens
to the space between the water particles? *
A.There is no space between the water particles.
B.The space between the water particles does not change.
C.The space between the water particles becomes much smaller.
D.The space between the water particles becomes much larger.
Answer:
D.The space between the water particles becomes much larger.
Explanation:
Answer:
the space between the water particles become much larger
Find the number of atoms of each element in 180g na2so4
Answer:
Explanation:
There really are no atoms. Some are ions. However at your level, I think you are expected to answer something connected to 6.02 * 10^23
First Find the mass of one mole
Na: 2 * 23 = 46
S: 1 * 32 = 32
O: 4* 16 = 64
Total 142
Next Find the number of Moles
1 mole has a mass of 142
x mole have a mass of 180
Cross Multiply
142 * x = 180 * 1
x = 180 / 142
x = 1. 27 moles.
Next figure out the number of atoms in 1.27 moles of Na2SO4
Na: 2 * 1.27 * 6.02 * 10^23 = 1.53 * 10^24
S : 1 * 1.27 * 6.02 * 10^23 = 7.6 * 10^23
O: 4 * 1.27 * 6.02 * 10^23 =3.05 * 10^24
Total 5.34*10^24
Convert the following . Show your work for full credit.( 2pts each: 16 pts)
1. 2 inches = _______________mm
2. 7 lb = _________________g
3. 3 ft.= _________________cm
4. 16 gallons = _________________L
5. 457° C = ____________________° F
6. 104° F = ____________________° C
7. 4 inches = __________________ cm
8. 57kg = ___________________lbs.
what volume unit is greater than one liter
What is the atom in the nucleus?
Answer questions 2 and 3
Please help me I need this correct or my grade drops and thank you if you answer my the questions.
Answer:
2:a-heterogenous
b-homogenous
c-heterogenous
d-heterogenous with water
3:Filtration is used to separate insoluble particles from a solution
Distillation is used to separate liquids with close but different boiling points e.g water and ethanol
Explanation:
2: homogenous mixtures form a uniform layer meaning that a mixture containing more than one layer is heterogenous
how would You describe the jumping pattern of the green frog shown below?
What does the green frog shown below look like?
Why would two (2) chlorine atoms be stably bonded together?
Answer:
The two chlorine atoms are said to be joined by a covalent bond.
Explanation:
The reason that the two chlorine atoms stick together is that the shared pair of electrons is attracted to the nucleus of both chlorine atoms. Hydrogen atoms only need two electrons in their outer level to reach the noble gas structure of helium.
Two chlorine atoms are are said to be stably bonded together as the two atoms require 1 valence electron each to complete their octet which is achieved by formation of covalent bond.
What is a covalent bond?
Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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. Ana has two mixtures. Mixture 1: marble and salt. Mixture 2: Salt and pepper She predicts she can easily separate the ingredients from mixture-1 by sorting out using her fingers. i) Do you think that Ana's prediction was right? Give reason for your answer
Answer:
No
Explanation:
No, Ana's prediction of sorting out : mixture 1 'marble salt' with by her fingers, ie handpicking is not right.
Marble & salt particles mixture can't be sorted by handpicking. They can be seperated by the method of sieving rather, as marble particles being bigger stay in the sieve & salt particles being smaller (finer) pass through it.
aluminum has 10 electrons what is its charge
Answer:
Al3+ indicates an ion of aluminum having a charge of + 3. I.e., since an aluminum atom normally has 13 protons and 13 electrons, this ion has 10 electrons (-10 charge) and 13 protons (+ 13 charge) giving it a charge of + 3 (-10 + 13 = +3).
Explanation:
Al3+ indicates an ion of aluminum having a charge of + 3. I.e., since an aluminum atom normally has 13 protons and 13 electrons, this ion has 10 electrons (-10 charge) and 13 protons (+ 13 charge) giving it a charge of + 3 (-10 + 13 = +3). Hopefully this helps you
