Answer:
The 10 kilogram ball
Explanation:
Which effect does an ocean have on the climate?
Answer:
A. ocean winds can carry moisture with them and can bring rain and fog over inland areas
Explanation:
It's "A. ocean winds can carry moisture with them and can bring rain and fog over inland areas' for K12 (OHVA to be exact)
Answer:
ocean currents regulate global climate, helping to counteract the uneven distribution of solar radiation reaching Earth's surface
The graph indicates what about the relationship between atmospheric carbon dioxide and time
A)
over time, the amount of atmospheric carbon dioxide increases
B)
over time, the amount of atmospheric carbon dioxide decreases
over time, the amount of atmospheric carbon dioxide stays the same
D)
over time, the amount of atmospheric carbon dioxide does not change
Answer:
A)
over time, the amount of atmospheric carbon dioxide increases
Explanation:
Answer: a) over time, the amount of atmospheric carbon dioxide increases
Explanation:
The third test you read about uses the apparatus shown above to test for conductivity of electricity. If the bulb lights up, then the substance dissolved in the water is likely
Answer: A.ionic
Explanation:
Got it right
Answer:
Ionic
Explanation:
a certain element xx has four isotopes. 51.45% of xx has a mass of 89.90470 amuamu . 11.22% of xx has a mass of 90.90565 amuamu . 17.15% of xx has a mass of 91.90504 amuamu . 20.18% of xx has a mass of 93.90632 amuamu . what is the average atomic mass of element xx ?
Considering the definition of atomic mass, isotopes and atomic mass of an element, the average atomic mass of element x is 91.16759 amu.
Definition of atomic massThe atomic mass is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeIsotopes of the same element are those atoms where the atomic numbers are the same, but the number of neutrons is different.
Definition of atomic massThe atomic mass of an element is the weighted average mass of its natural isotopes, taking into account the relative abundance of each of them.
Atomic mass of the element in this caseIn this case, you know:
51.45% (0.5145) of x has a mass of 89.90470 amu. 11.22% (0.1122) of x has a mass of 90.90565 amu. 17.15% (0.1715) of x has a mass of 91.90504 amu. 20.18% (0.2018) of x has a mass of 93.90632 amu.Then, the average mass of the element x can be calculated as:
average mass= 89.90470 amu×0.5145 + 90.90565 amu×0.1122 + 91.90504 amu×0.1715 + 93.90632 amu×0.2018
Solving:
average mass= 91.16759 amu
Finally, the average atomic mass of element x is 91.16759 amu.
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I just need help plz!
_______ is a nanomaterial that is often used with other compounds to desalinate and decontaminate water.
The electrical behavior of semiconductor devices and electronics can be engineered using a process called _______.
Answer:
Graphene is a nanomaterial that is often used with other compounds to desalinate and decontaminate water.
The electrical behavior of semiconductor devices and electronics can be engineered using a process called Doping
Explanation:
When ionic compounds are added to water, they dissociate or break apart into ions. In the case of table salt, salt added to water dissociates into sodium ions and chloride ions. This would seem to be a chemical change. However, scientists do not consider this to be one, because the solid table salt remains after the water is evaporated. The atoms recombine into their original arrangement once the water is removed.
Which word from the selection helps you understand that physical changes can be undone?
a added
b dissociate
c recombine.
d removed
A hydrogel is composed of crosslinked polymer chains, which are highly water absorbent. The gels are mostly (mostly>90%) water. Liesegang line patterns are precipitation patterns that appear in a gel when a chemical reaction takes place when a diffusing chemical (reactant A) in a gel reaches a concentration that is just enough to react with the reactant B (already present and homogeneously distributed in the gel) to form a precipitate. This precipitate appears as a colored line in the gel. Once the precipitate forms, reactant A is consumed all – however, diffusion of A does not stop. A ions propagate deeper into the gel and form another line of the precipitate when the A concentration again reaches the threshold concentration, just enough to react with the reactant B.
In the system shown on the right, A=Cu2+ ions, B is CrO42-. Cu2+
ions diffuse from the solution at the top into the yellow-colored
gel, which has CrO42- solution. The Cu2+ ions react with CrO42-
ions to form the CuCrO4 precipitate. There are no Cu2+ ions
present in the gel before the diffusion. Assuming that the
concentration of Cu2+ does not change at the solution/gel interface
and is 4.0 mol/L, and it is 0 mol/L at the bottom of the gel for the
duration of the precipitate formation,
1) find the depth of the first precipitate line that would appear in
the gel if the threshold concentration for the line formation is 0.05
mol/L and the time for the line to appear is 5 hrs. The temperature
is 25oC. D25= 1.2x10-8 m2/s.
2) at which temperature the line would appear at the same distance from the start, but in 75 min? Qd= 40 kJ/mol
How many moles are in 8.32 x 1024 molecules of CO2.
Answer:
13.82 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{8.32 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 13.820598...[/tex]
We have the final answer as
13.82 molesHope this helps you
3. A compound formed of CO2 and water is sour? Why?
Explanation:
it's because when CO₂ reacts with H₂O then it forms H₂CO₃ (carbonic acid), which is a acid that's why a compound formed by CO₂ and H₂O is sour.
Reaction:
CO₂ + H₂O → H₂CO₃
Calculate the pH when 25.0ml of 0.90M CH3COOH is mixed with 25.0ml of 0.45M NaOH.
pH of mixed solution = 4.3
Further explanationA buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solution consists of weak acids and their salts.
[tex]\tt \displaystyle [H^+]=Ka\times\frac{mole\:weak\:acid}{mole\:salt\times valence}[/tex]
valence according to the amount of salt anion
mol CH₃COOH = 25 ml x 0.9 = 22.5 mlmol
mol NaOH = 25 ml x 0.45 = 11.25 mlmol
ICE method :
Reaction
NaOH + CH₃COOH ---> CH₃COONa + H₂O
11.25 22.5
11.25 11.25 11.25 11.25
11.25 11.25 11.25
mol acid = 11.25, mol salt = 11.25, Ka CH₃COOH = 5.10⁻⁵
Then [H⁺]=
[tex]\tt [H^+]=5.10^{-5}.\dfrac{11.25}{11.25\times 1}\rightarrow salt~valence=1\\\\(H^+]=5.10^{-5}\\\\pH=5-log5=4.3[/tex]
Need answers to all these questions asap
Answer:
Li3PO4 + Sn(CH3COO)2 ------> LiSnPo4 + Li2(CH3COO)2
Explanation:
What is the main product of cellular
respiration?
Answer:
The main products are ATP, carbon dioxide, and water.
When ionic compounds are added to water, they dissociate or break apart into ions. In the case of table salt, salt added to water dissociates into sodium ions and chloride ions. This would seem to be a chemical change. However, scientists do not consider this to be one, because the solid table salt remains after the water is evaporated. The atoms recombine into their original arrangement once the water is removed. Which word from the selection helps you understand that physical changes can be undone? a added b dissociate c recombine. d removed
Answer:
b dissociate
Explanation:
If the value of mass doubles but the volume stays the same, the value for density will be
Answer:
if the value of volume doubles but the mass stays the same, the value for density will be 1
what is solvent and solute
Answer:
Solute=the substance which a solvent dissolve to produce homogeneous mixture
Solvent= the substance in which a solute dissolve to produce homogeneous mixture
Explanation:
solvent: The liquid in which a solute is dissolved to form a solution.
solute: The component in a solution, dissolved in the solvent.
Calculate the molar mass of B(NO3)3 ?
The molar mass of B(NO₃)₃ - Boron nitrate : 196.822 g/mol
Further explanationIn stochiometry therein includes
Relative atomic mass (Ar) and relative molecular mass / molar mass (M)
So the molar mass of a compound is given by the sum of the relative atomic mass of Ar
M AxBy = (x.Ar A + y. Ar B)
The molar mass of B(NO₃)₃ - Boron nitrate :
M B(NO₃)₃ = Ar B + 3. Ar N + 9.Ar O
M B(NO₃)₃ = 10.811 + 3. 14,0067 + 9. 15,999
M B(NO₃)₃ = 196.822 g/mol
Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen? TA B Block A has a higher temperature than block B heat flow The two blocks are the same temperature and heat flow stops Heatis transferred from the wamer block to the cooler block 2012 Encyclopædia Batannlea, Inc. B B heat flow
Answer:
Heat is transferred from the warmer block to the cooler block
Explanation:
Heat transfer by conduction involves two or more solids. The heat generally moves from a part at higher temperature to one with a lower temperature.
Heat transfer is based on the differences in temperature profile on a body. When the temperature of the body is the same, heat is not transferred. The molecules that makes up the hotter body collides with static molecules of the cold one. Through this, heat is transferred.the structure that serves as the outer boundary of the eukaryotic cell is the cell membrane
Answer:
The Plasma Membrane.
Explanation:
The eukoryotic cell is enclosed in a limiting membrane called the Plasma Membrane or Plasmalemma. ❤️
5.69 x 10
5.27 x 1014
When more than one variable is an experiment is changed at a time, the scientist
Answer:
Nepal is rich in biodiversity
Compression will lead to a reverse fault
A.True
B.False
Answer:
If the fault develops in a situation of compression, then will be a first fault due to the fact that compression causes the hanging wall to be pushed up relative to the footwall.
If a 200 kg person stands next to a 100 kg person. Which person would have a larger gravitational attraction?
Answer:
200 kg
Explanation:
the 200 kg person is heavier due to gravity's force the 100 kg person has less force than the other person
Answer:
massive one that is 200kg
Explanation:
Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.
When an atom becomes a positive
ion, the radius of the atom
(1) decreases
(2) increases
(3) remains the same
Answer: When an atom becomes a positive ion it pulls it's electrons closer, decreasing it's radius moreover, when it becomes a negative ion, it pulls it's electrons closer and decreases the radius
I hope this helps :)
How does heat differ from temperature? (Heat vs Temperature) Temperature is the measure of heat. Temperature is the measure of heat. Temperature and heat are the same thing. Temperature and heat are the same thing. Temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy. Temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy. Temperature measures the loss of energy, and heat measures the gain of energy.
Answer:
Temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.
Explanation:
The difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.
How does heat differ from temperature?Temperature is the measure of cold or heat, often measurable with a thermometer while heat is the flow of thermal energy from a substance with higher temperature to that with a lower temperature.
Temperature is a scalar quantity while heat is a vector quantity. This suggests that temperature has no direction while heat posseses direction.
Therefore, the difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.
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bigger size elements have low ionization energy and high shielding effect.why
Answer:
Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.
The ionization energy decreases as the size increases. The electrons get added to the new shell and the nuclear charge increases. But the effect of addition of new sheels overcomes the increase of nuclear charge.The valence shell moves far from the nucleus.
Thus the valence electron gets less tightly held by the nucleus and thus less energy is required to remove the valence electron.
Shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus. Thus as the size increases and the electrons move away from nucleus, the attractive forces decrease.
At 35°C and 2 atm of pressure, the volume of gas is 200 ml. If the temperature changes to
55°C and the pressure changes to 4 atm, what is the new volume of gas?
Answer:
V₂ = 106.5 mL
Explanation:
Given data:
Initial volume =200 mL
Initial pressure = 2 atm
Initial temperature = 35 °C (35 +273 = 308 K)
Final temperature = 55°C (55+273 = 328 K)
Final volume = ?
Final pressure = 4 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 2 atm ×200 mL × 328 K / 308 K ×4 atm
V₂ = 131200 atm .mL. K / 1232 K.atm
V₂ = 106.5 mL
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More mass
9 Calculate A block of wood has a mass of 120 g
and a volume of 200 cm³. What is the density of
the wood?
Answer:
Explanation:
The density is measured by: D=mV . Therefore, for the piece of wood in question the density could be calculated by: D=mV=57g125cm3=0.46gcm3 .
Determine the identity of a sample of gas at STP conditions, with a mass of 120.00 grams that occupies 67.2 L.
a) N2
b) Ar
c) He
d) Ne
explain your answer
Answer:
b) Ar
Explanation:
Given data:
Mass of sample gas = 120.00 g
Volume of gas = 67.2 L
Identity of gas = ?
Solution:
We will calculate the molar mass do identify the sample:
Number of moles of gas:
PV = nRT
1 atm×67.2 L = n×0.0821 atm.L/mol.K×273 K
67.2 atm.L = n × 22.42atm.L/mol
n = 67.2 atm.L / 22.42atm.L/mol
n = 3 mol
Molar mass of gas:
Number of moles = mass/molar mass
Molar mass = 120.00 g/3 mol
Molar mass = 40 g/mol
The given sample of a gas is Ar.
3Fe + 4H2O ‐----> Fe3O4 + 4H2
10 g of water vapour are passed on 16.8 g of iron which is heated till redness find the limiting reactant
The limiting reactant : Fe
Further explanationReaction
3Fe + 4H₂O ⇒ Fe₃O₄ + 4H₂
mass of H₂O = 10 g
mol H₂O (MW=18 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{10}{18}=0.56[/tex]
mass of Fe = 16.8 g
mol Fe(MW=56 g/mol) :
[tex]\tt mol=\dfrac{16.8}{56}=0.3[/tex]
Limiting reactant : the smallest ratio between mol : reaction coefficient
Fe :
[tex]\tt \dfrac{0.3}{3}=0.1[/tex]
H₂O :
[tex]\tt \dfrac{0.56}{4}=0.14[/tex]
Fe as limiting reactant