what must happen for heat to be transferred by thermal conduction?
The transfer of heat between substances by thermal conduction is only possible when they are in direct contact with each other.
What is Thermal Conduction ?The transfer of heat from the hotter end to the colder end of object is known as conduction.
The spontaneous flow of Heat from a hotter to a colder body ie, heat is conducted from the hotplate of an electric stove to the saucepan when it is in contact with it.
The better the conductor, the more rapidly heat will be transferred.
Thus, The transfer of heat between substances by thermal conduction is only possible when they are in direct contact with each other.
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What is the molarity of a solution that has 2.87 moles of NaCl in 5020 mL of solution?
9. Carbon-14 has a half-life of 5,730 years. How many years have passed after 3
half-lives?
Answer:
120 gram sample of a radioactive element, how many grams of that element will be left after 3 half-lives have passed? If you have a 300
Explanation:
Hope this helps!
25.0(g) of pentane(C5H12) is combined with excess oxygen
Answer:Hlo
Explanation:How are you?
Arrange the following lons in order
of increasing size
giving reasons
Na+, Mg2+, AL3+ (4Na,12Mg,13Al)
Answer:
na+then mg2+ then al3+
Explanation:
this is due to the distance between their nucleus and valence electron
why is there no reaction between copper and sodium chloride
remember I am talking of copper alone and not copper sulfate.
Answer:
If the solution is not in contact with air, nothing will happen. If the solution is in contact with air, it will be not a reaction between copper, water and sodium chloride..
in the end there will be no reaction
please help i need to do good in this class
Answer:
Explanation:
di) number of protons is 12 for all, number of neutrons is 13 for mg- 25 and 14 for mg-26
what is a compound?
Answer:
NOUN
a thing that is composed of two or more separate elements; a mixture
Explanation:
basically a mixture
how many grams of Ca(OH)2 are needed to produce 500ml of 1.66 M Ca(OH)2 solution
can someone help me convert these please !
help pleaseee
find the molecular formula of a compound with a molar mass of 70.0 g/mol and an empirical formula of CH2.
Answer:
In order to find the molecular formula from an empirical formula you must find the ratio of their molecular masses.
We know that the molecular mass of the molecule is 70
gmol-1
. We can calculate the molar mass of
CH2
from the periodic table:
C=12.01
gmol−1
H=1.01
gmol−1
CH2 =14.03
gmol−1
Hence we can find the ratio:
14.03
70
≈
0.2
21.Electromagnetic radiation can take the form of which of the following types of waves
a.Heat
b.Light
c.Ultraviolet
d.All of the above
A Bunsen burner usually burns methane gas (CH4) using words, write the chemical equation for this reaction.
The general chemical equation for the complete combustion (or burning) of some hydrocarbon fuel is, in words, as follows:
hydrocarbon fuel and oxygen gas react to produce carbon dioxide gas and water vapor,
or, using chemical notation,
[tex]\mathrm{C_xH_y} + z\mathrm{O_2} \rightarrow \mathit{x}\mathrm{CO_2} + \frac{\mathit{y}}{2}\mathrm{H_2O}[/tex]
where
[tex]z = x + \frac{y}{4}.[/tex]
Don't worry if that looks daunting. In our case, we are given the identity of the fuel (methane, or CH₄), so our equations will be straightforward.
In words: Methane gas and oxygen gas react to produce carbon dioxide gas and water vapor (or methane gas + oxygen gas → carbon dioxide gas and water vapor).
In chemical notation:
[tex]\mathrm{CH_4}_{\text{(g)}} + 2\mathrm{O_2}_{\text{(g)}} \rightarrow \mathrm{CO_2}_{\text{(g)}} + 2\mathrm{H_2O}_{\text{(g)}}.[/tex]
Leila made herself a cup of hot chololate weighing 150 grams. If she started with 125 grams of milk, how many grams of hot chocolate mix did she add?
Answer:
150g-125g
=25 of hot chocolate mix
4. How many electrons do each of the following kinds of matter have in each atom? a. silver 47 protons electrons b. carton: 6 protons electrons Sodium: 11 protons electrons d. neon 10 protons electrons e. iodine. 53 protons electrons
Answer:
a. 47 electrons
b. 6 electrons
c. 11 electrons
d. 10 electrons
e. 53 electrons
Explanation: If you are talking about neutral atoms (where as the number of protons in an atom is equal to the number of electrons in the atom), or are just being introduced to atoms then the number of electrons will be equal to the number of protons the atom has. Or vice versa, the number of protons will be equal to the number of protons in an atom. For example, in a neutral atom, with 51 protons, will have 51 electrons. Or an atom with 5 electrons will have 5 protons.
Which two types of rock could form after other rock melts into liquid
magma?
6 of 10 QUESTIONS
Sedimentary
Metamorphic
Intrusive igneous
Extrusive igneous
Answer:
The answer is intrusive igneous and extrusive igneous.
Explanation:
I’ve done the question on A P E X
Which action could cause a sample of liquid to boil?
A. Decreasing the temperature of the liquid
B. Decreasing the sample size of the liquid
C. Decreasing the pressure on the liquid
D. Decreasing the volume of the liquid
Hurry please
Answer:
B
Explanation:
Decreasing the sample size of the liquid
hope it helps!
Can someone please check my answer for question 2? If It’s wrong please correct me. Thank you
The new volume : V₂ = 1185.9 cm³
Further explanationGiven
V₁ = 571 cm³
T₁ = 260 K
T₂ = 540 K
Required
The new volume (V₂)
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
V₂ = V₁.T₂/T₁
V₂ = 571 x 540 / 260
V₂ = 1185.9 cm³
Answer:
V₁ = 571 cm³
T₁ = 260 K
T₂ = 540 K your right
Explanation:
The new volume will by 1185.9
what is the physical property to the temperature when a liquid begins to boil?
Answer:
The boiling point
Explanation:
The boiling point is the temperature where a liquid starts to boil.
Answer:
the boiling point.
Explanation:
Plants can provide the materials that animals use in cellular respiration, and animals can provide some of the materials that plants use for photosynthesis. The image below shows the relationship between photosynthesis and cellular respiration. According to the diagram, how does cellular respiration aid the process of photosynthesis?
It produces ATP.
It produces glucose.
It produces mitochondria.
It produces carbon dioxide
Answer:
it produce atp
Explanation:
.............
Cellular respiration is a metabolic process that occurs in the cells of an organism. Carbon dioxide from cellular respiration aids the process of photosynthesis.
What are cellular respiration and photosynthesis?Cellular respiration is a process that takes place in the organism's cell where the cellular oxygen or chemical energy gets utilized and converted to ATP and waste like carbon dioxide.
The carbon dioxide released by the organism in the atmosphere is used by plants in the process of photosynthesis. Photosynthesis is a process that utilizes carbon and water to form glucose and oxygen.
Therefore, cellular respiration supports the process of photosynthesis by option D. producing carbon dioxide.
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How does the number of protons compare to the number of
electrons in a canton
Answer: The number of protons in cation is more than the number of electrons
Explanation:
cations are positive ions that means that they lose electrons to be stable nd have electron configuration (atomic number ) equivalent to the preceding noble gas
as : sodium 11 , it loses on electron to be stable and its electron configuration is equivalent to neon 10
so ,the number of protons in cation is more than the number of electrons
i hope it helps!
How many liters are in 100g of CoCl2?
Answer:
0.77018342688495
Explanation:
I did this
While the Bohr model fails to show the true shape of the electron orbitals with in an atom, it is still used because it ?
Answer:
Is used to predict the spectra of hydrogen and hydrogen like species
Explanation:
The Bohr's model of the atom was propounded by Neis Bohr. In his theory, an atom is composed of quantized energy levels in which electrons may be found.
The transition of an electron between energy levels leads to the absorption or emission of energy in the form of a photon of visible light. The energy absorbed or emitted depends on the energy difference between the two energy levels.
The model is successful at predicting the electronic spectra of one electron species but totally fails when the specie has more than one electron. Also, the model fails to show the true shape of the electron orbitals within an atom.
How many moles of each element are in one mole of (NH4)2S? (3 points)
a
1 mole of nitrogen, 8 moles of hydrogen, 1 mole of sulfur
b
1 mole of nitrogen, 6 moles of hydrogen, 1 mole of sulfur
c
2 moles of nitrogen, 6 moles of hydrogen, 1 mole of sulfur
d
2 moles of nitrogen, 8 moles of hydrogen, 1 mole of sulfur
Answer:
2 moles of nitrogen, 8 moles of hydrogen, 1 mole of sulfur
Explanation: i took the test and got it right
The number of moles for each element in one mole of (NH₄)₂S are:
d. 2 moles of nitrogen, 8 moles of hydrogen, 1 mole of sulfur
Identification of number of moles:The number of moles can be identified by dividing the given mass by molar mass.
In one mole of (NH₄)₂S there are moles of each participating element i.e. nitrogen, oxygen, hydrogen, and sulfur.
In this molecule, there are 2 moles of nitrogen, 8 moles of hydrogen, and one mole of sulfur.
Thus, option d is correct.
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How many particles would be found in 2.38 g of (NH4)3PO4
The number of particles in 2.38 g ammonium phosphate are [tex]\rm \bold{9.0345\;\times\;10^2^1}[/tex].
The number of particles in a mole of sample is given by Avogadro law. The number of particles in a mole of a sample is equivalent to [tex]\rm 6.023\;\times\;10^2^3[/tex].
Computation for number of molecules in [tex]\rm (NH_4)_3PO_4[/tex]The given mass of ammonium phosphate is 2.38 g.
The molar mass of ammonium phosphate is 149 g/mol
The moles of the sample is given as:
[tex]\rm Moles=\dfrac{Mass}{Molar\;mass} \\\\Moles\;(NH_4)_3PO_4=\dfrac{2.38\;g}{149\;g/mol}\\\\ Moles\;(NH_4)_3PO_4=0.015\;mol[/tex]
The available moles of ammonium phosphate is 0.015 mol.
According to Avogadro's law, the number of particles in the sample is given as:
[tex]\rm 1\;mol=6.023\;\times\;10^2^3\;particles\\\\0..015\;mol=\dfrac{6.023\;\times\;10^2^3\;particles}{1\;mol}\;\times\;0.015\;mol\\\\ 0.015\;mol=9.0345\;\times\;10^2^1\;particles[/tex]
The number of particles in 2.38 g ammonium phosphate are [tex]\rm \bold{9.0345\;\times\;10^2^1}[/tex].
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what are oil and waters properties of matter?
Answer:
Two other beneficial properties of the oil include the inhibition of corrosion of metal surfaces, such as steel, and the removal of dirt and detritus via detergency.
Properties of water include its chemical formula H2O, density, melting, boiling point & how one molecule of water has two hydrogen atoms covalently bonded to one oxygen atom.
Stoichiometry :
2 AlCl3 + 3 MgSO4 --> Al2(SO4)3 + 3 MgCl2
If 633.1 g AlCl3 reacts, how many moles of MgCl2 are formed?
If the price of peaches increases, what can be expected?
More peaches will be sold.
Fewer peaches will be sold.
The number of peaches sold will be unaffected.
Peach orchards will produce less fruit.
Answer:
fewer peaches will be sold
Explanation:
if the price increases less people will want to buy it, but the orchards would still get money so they wouldnt be affected
Answer:
fewer peaches
Explanation:
When 5.0g of NH4CLO4 is added to 100mL of water in a calorimeter, the temperature of the solution formed decreases by 3.0C?
Answer:
24.7 C
Explanation:
I don't know how
The final temperature of 1000 ml water by the addition of 5 g ammonium perchlorate has been 24.7 degree Celsius.
With the addition of 5 g of ammonium perchlorate, the drop in temperature has been:
The addition of 5 g sample to 100 ml water has absorption of energy, that results in change in temperature of 3 degree Celsius.
The heat absorbed by sample has been given as:
Heat = mass × specific heat × change in temperature
Since, the same mass of sample has been added to 25 degree Celsius water, according to law of conservation, the change in density for both the changes has been equivalent.
The ratio of masses has been equivalent to the ratio of volume.
[tex]\rm \dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;=\;\dfrac{Volume\;at\;1000\;ml}{Volume\;at\;100\;ml}\\\\\\\dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;=\;\dfrac{1000\,ml}{100\;ml}\\\\\\\dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;=\;10[/tex]
Since, the mass at 100 ml and mass at 1000 ml has been equal, the heat absorbed by the sample has also been equal. Equating the values:
Mass at 100 ml × Specific heat × Change in temperature = Mass at 1000 ml × Specific heat × Change in temperature
[tex]\rm 3\;degree\;Celsius\;= \;\dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;\times\;Change\;in\;temperature\\\\3\;degree\;Celsius\;= \;10\;\times\;Change\;in\;temperature\\\\Change\;in\;temperature\;=\;\dfrac{3}{10}[/tex]
Change in temperature = 0.3 degree Celsius.
The initial temperature of water has been 25 degree Celsius. The change in temperature has been given by:
Change in temperature = Initial temperature - Final temperature
0.3 degree Celsius = 25 degree Celsius - Final temperature
Final temperature = 25 - 03 degree Celsius
Final temperature = 24.7 degree Celsius.
The final temperature of 1000 ml water by the addition of 5 g ammonium perchlorate has been 24.7 degree Celsius.
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Practice working with numbers that have exponents. In the blank provided, write greater than, less than, or equals.
a. 10–2 ____________________ 10–3
b. 10–14 ____________________ 101
c. 10–7 ____________________ 0.0000001
d. 100 ____________________ 101
Answer:
a. 10⁻² > 10⁻³
b. 10⁻¹⁴ < 10¹
c. 10⁻⁷ = 0.0000001
d. 100 > 10¹
Explanation:
a. 10⁻² > 10⁻³We can rewrite those numbers as 0.01 and 0.001. That way the answer becomes clearer.
b. 10⁻¹⁴ < 10¹Any positive number with a negative exponent will be less than 1.
c. 10⁻⁷ = 0.0000001In the decimal, the 1 is exactly 6 zeros away from the dot, meaning the 1 is in the seventh place.
d. 100 > 10¹10¹ is equal to 10.