Answer:
D.) The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.
Answer
The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.
I NEED HELP PLZ HELP
Answer:
A
Explanation:
The modern continent of Africa is currently in the process of splitting into
multiple tectonic plates. The Nubian Plate is moving eastward. The Somali Plate is
also moving eastward, but at a slightly faster rate. In what way is this event like
the breakup of Pangaea?
Tectonic plates are found in the oceanic and continental lithosphere. The splitting of Africa and the plate tectonics movement is similar to Pangaea as the latter was a large continent that also split.
What is Pangaea?
Pangaea was a large continent in the early geological times that covered almost all the landmass of the earth. It was a supercontinent that underwent splitting after the continental plates started drifting apart, resulting in the formation of the now known continents.
The movement of the Nubian and the Somali plates of Africa is similar to that of the Pangaea as the continent is big and intact now but in the future, the plates will drift very apart, creating more smaller continents.
Therefore, the Pangaea event is similar to the plate tectonic movement of Africa.
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I gotta pick 4 last question to pass :,) pls help:>
whoever answers first will be marked brainliest unu
Answer:
Explanation:
heat up the solvent
increse the pressurre of the mixture
add more solute
agitate
Usually , it takes very little time for a community to develop during primary succession False True
HELPS
Describe the three steps involved in producing crystals of the salt copper sulfate.
Answer:
Add copper (II) oxide (insoluble base), a little at a time to the warm dilute sulfuric acid and stir until the copper (II) oxide is in excess (stops disappearing) Filter the mixture into an evaporating basin to remove the excess copper (II) oxide. Leave the filtrate in a warm place to dry and crystallize.
The three main steps involved in producing crystals of the salt copper sulfate is listed below.
What is the process of making Soluble Salts ?
Soluble salts can be made by reacting acids with soluble or insoluble reactants.
Titration method is used if the reactants are soluble
Insoluble salts are made by precipitation reactions.
For producing crystals of the salt Copper Sulfate from copper oxide following three steps needs to be done ,
1. Copper oxide is added continuously with a spatula to the Water Bath heated Sulfuric Acid , until it gets in excess.
2. The mixture is filtered to remove extra Copper Oxide, and then pour the filtrate (Copper sulfate solution) into an evaporating basin , where it is heated to evaporate half of the water .
3. The solution is poured into a watch glass so that all the water evaporates.
Hence we are left with blue and regularly shaped Hydrated copper sulfate crystals .
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238
U
92
+
Th
90
4
He
2
When radioactive uranium, or U-238, decays it emits an alpha particle and produces a nuclide of thorium. According to the nuclear
equation, what is the mass of the thorium produced?
A)
234
B)
238
C)
242
D)
244
Answer:
c) 242
Explanation:
you subtract 238-92= 146 then you add 146+90+4+2 that will give you 242
Calculate the pH of a 0.002M acetic acid solution if it is 2.3% ionised at this dilution, ka=1.8×10^-5.
Answer:
3.11 is the pH of the solution
Explanation:
The ionised form of the acetic acid is the acetate ion. To solve this problem we need to solve H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer
pKa = -log Ka = 4.74
[A⁻] = Concentration of acetate ion = 0.002M * 2.3% = 4.6x10⁻⁵M
[HA] = Concentration of acetic acid = 0.002M *(100-2.3)% = 0.001954M
Replacing:
pH = 4.74 + log [4.6x10⁻⁵M] / [0.001954M]
pH = 3.11 is the pH of the solution
if the Gulf Stream is warm and the air in Europe is cold, what kind of energy transfer will happen between the water and the air?
Answer:
If it weren't for the warm water of the Gulf Stream, England would have a much colder climate
Explanation:
Answer:
If it weren't for the warm water of the Gulf Stream, England would have a much colder climate
Explanation: hope it helps ^w^
100 POINTS +BRAINLIEST PLZ ANSWER ASAP
Eduardo looks at stars through his telescope. He says that the star Sirius is brighter than the star Rigel. In reality, Rigel has a greater absolute brightness than Sirius. What can explain Eduardo's observation?
A. Sirius is much closer to Earth than Rigel
B. Rigel is much closer to Earth than Sirius
C. Sirius is a hotter star than Rigel.
D. Rigel is a hotter star than Sirius,p
Answer:
answer is A. Sirus is much closer to Earth than Rigel.
Answer:
A
Explanation:
The first law of thermodynamics is observed when
Answer:
Explanation:
The first law of Thermodynamics is known as Conservation because it explains that energy is always maintained within a closed system and cannot be created or destroyed. Therefore, this is observed when there is no longer change in temperature in a system. Mainly because the energy is not being transferred to and from another system. Without this transfer of energy, the energy itself gets conserved within the system and the temperature no longer fluctuates.
Can someone help me with this please?
Molar Concentration of H2O+ lons
in Four Solutions
Solution Molar Concentration
of H3O+ lon
(M)
A 0.1
B 0.01
с 0.001
D I’m 0.0001
Which solution has the highest pH?
Answer:
d
Explanation:
because it’s moving the most spots to the left
The acidity or alkalinity of a solution depends upon its hydronium ion concentration and hydroxide ion concentration. Here among the given solutions, the solution D has the highest pH. The correct option is D.
What is pH?The pH of a solution is defined as the negative logarithm to the base 10 of the value of the hydronium ion concentration in moles per litre. The pH scale is introduced by the scientist Sorensen. It is more easy to express the concentration of H₃O⁺ using this method.
The equation used to calculate the pH of the solution is given as:
pH = -log[H₃O⁺]
For 0.1 M
pH = -log[0.1] = 1
For 0.01 M
pH = -log[0.01] = 2
For 0.001 M
pH = -log[0.001] = 3
For 0.0001 M
pH = -log[0.0001] = 4
So solution D has the highest pH which is 4.
Thus the correct option is D.
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Explain how the use of fossil fuels can cause lakes and ponds to become more acidic.
Answer:
Explained below
Explanation:
Fossil fuels which are made up of coal and oil when burnt by power-production industries, make sulfur to be released into the atmosphere where it combines with oxygen to form SO2 (sulfur Dioxide). Now, the exhausts possessed by cars could also cause the formation of nitrogen oxides in the atmosphere. Therefore, H2SO4 which is airborne sulfuric acid and HNO3 which is nitric acid can be formed and when dissolved in the water vapor in the atmosphere form what is called acid rain.
Now, as acid rain flows through the soil, it can leach aluminum from the soil clay particles and then flow into the lakes to make them more acidic.
When a gas is heated, the gas particles have more kinetic energy. Complete the following sentence: This means they move about more and have more ______ with the sides of the container. This increases the pressure.
Answer:
Contact
Explanation:
As the speed of the particles increases, they move around more, which means they hit the sides of the container more.
what is haemoglobin? Name its function.
Answer:
Haemoglobin is the red pigment which is present in our blood and helps in transporting oxygen to different parts of our body.
Hope it helps
Answer:
Haemeglobin is a red substance that has the function of transporting oxygen into the blood.
Explanation:
Graham's law states that, the rate by which a gas effuses is __________ to the square root of the molar mass of that gas
A) not related
B) directly proportional
C) inversely proportional
D) a multiple
9 Answer
Based on Table S, an atom of which element has the strongest attraction for electrons in a chemical bond
What is the answer?
1 aluminum
2 chlorine
3 magnesium
4 sulfur
Answer:
Chlorine
Explanation:
The tendency of an atom to attract electron is referred to as electronegativty. In the periodic table, electronegativity increases across the period from left to right and decreases down the group.
Following that trend, the element with the greatest electronegativty is;
Chlorine
The atom that has the strongest attraction for electrons in a chemical bond in the options is Chlorine.
The tendency of an atom to attract electrons to itself is know as electronegativity.
The most electronegative element is fluorine.
Electronegativity increases across the period in the periodic table.
Electronegativity decreases down the group in the periodic table.
Examples of electronegative elements are mostly non metals like oxygen, fluorine, chlorine, etc.
Therefore, the atom that has the strongest attraction for electrons in a chemical bond is Chlorine.
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Which describes the path of energy that a gas powered car uses to drive along a road?
A. nuclear energy to light energy to electrical energy
B. chemical energy to heat energy to mechanical energy
C. mechanical energy to electrical energy to light energy
D. gravitational energy to kinetic energy to electrical energy
Answer:
mechanical energy to electrical energy to light energy
what are some compare and contrasts between Terrestrial Planets and Gas Planets?
Jazz and Pam went to Six Flags over Texas. They had fun riding the rides at the
amusement park. Their favorite ride was the Road Runner Express roller coaster. It
made so many turns, and it was going up hills and down hills really fast. Their inertia
was always changing throughout the ride. Once the roller coaster came to a stop they
moved forward into their seatbelt. This is an example of which Newton's Law?
Answer:
newtons first law
Explanation:
an object in motion will stay in motion unless acted upon by an outside force
What is an isotope and how are they formed?
Answer:
Long story short, isotopes are simply atoms with more neutrons — they were either formed that way, enriched with neutrons sometime during their life, or are originated from nuclear processes that alter atomic nuclei. So, they form like all other atoms.
Explanation:
What’s the answer for this question
Answer:
i think it's B
Explanation:
the bus will stop here into question tag
Answer:
the bus will stop here, wouldn't it?
Think about and describe how the organism might move around and how it might eat.Required to answer.
Answer:
Organisms move and eat through their habitats. They adapt to the environment and can survive in the environment with their own behavior.
Explanation:
Organisms are of many types. Some lives on land, some lives in water while others are hybrid organisms which can survive in water as well as on land. The organisms body movement is dependent on its cell functioning. Every organism has different cell structures which help them to survive on the earth.
what is a climax community? no plagiarism.
Answer:
In scientific ecology, climax community or climatic climax community is a historic term for a boreal forest community of plants, animals, and fungi which, through the process of ecological succession in the development of vegetation in an area over time, have reached a steady state.
Explanation:
word equations- Please help ASAP
Answer:
See answer below
Explanation:
In this case, you just need to use any acid you want (Like HCl, or H₂SO₄) to do this exercise.
You are given a sample of what you have to do which is:
Acid + metal ------> Salt + hydrogen
As you can see, an acid like the ones I wrote above, have hydrogen atoms, so you should put the hydrogen there. As for the part of salt, you just need to draw the corresponding salt that is formed when the acid reacts with the metal, and write it's name.
Let's do all three equations for you to a better understanding. For all the given examples, I will use HCl as acid, and i will explain one reaction cause the other two reactions happens the same thing, only with a different metal.
1. 2HCl + Zn ------> ZnCl₂ + H₂
As you can see, we just have a displacement reaction where the metal displaces the position of the hydrogen to form the salt and the hydrogen leaves the molecule as a gaseous molecule. Written in words it would be:
Hydrochloric acid + Zinc ----> Zinc chloride + hydrogen
2. 2HCl + Pb -------> PbCl₂ + H₂
Hydrochloric acid + lead ------> Lead (II) chloride + hydrogen
3. 2HCl + Fe -------> FeCl₂ + H₂
Hydrochloric acid + iron ------> Iron (II) chloride + hydrogen
Hope this helps
pls help i have to pick 3 T-T
Answer:
Explanation:
elemant
compound
mixture
A solution of benzene is prepared by dissolving 0.32 mg of benzene to volume of 100 dm3 calculat molarity
Answer:
4.10 x 10⁻⁸ M
Explanation:
The molarity (M) of a solution is defined as the number of moles of solute per liter of solution. We have to first calculate the number of moles of solute (benzene) from the mass and the molecular weight:
Benzene has the chemical formula C₆H₆. So, its molecular weight (MW) is calculated from the molar mass of C (12 g/mol) and H (1 g/mol):
MW(C₆H₆)= (12 g/mol x 6 C) + (1 g/mol x 6 H) = 78 g/mol
Then we convert the mass of benzene (0.32 mg) from mg to grams and divide the mass into the MW:
mass = 0.32 mg x 1 g/1000 mg = 3.2 x 10⁻⁴ g
moles of benzene = mass/MW = 3.2 x 10⁻⁴ g/(78 g/mol) = 4.10 x 10⁻⁶ mol
Now, we convert the volume of solution from dm³ to L:
liters of solution = 100 dm³ x 1 L/1 dm³ = 100 L
Finally, we divide the moles of benzene into the volume of solution in liters:
M = moles of benzene/liters of solution = 4.10 x 10⁻⁶ mol/100 L = 4.10 x 10⁻⁸ mol/L = 4.10 x 10⁻⁸ M
Is PCI3 a good conductor?
Answer:
Since the ions cannot move, ionic solids are non-conductors of electricity. When the solid is melted to a liquid, however, the ions are free to migrate. Therefore, ionic liquids are good conductors of electric current. A conductor is a substance capable of transmitting electricity and/or heat.
Explanation:
:)
No, [tex]PCI_3[/tex] is not a good conductor.
What is [tex]PCI_3[/tex]?Phosphorus trichloride is an inorganic compound with the chemical formula PCl3. A colourless liquid when pure, is an important industrial chemical, being used for the manufacture of phosphates and other organophosphorus compounds.
The liquid does not conduct electricity because of the lack of ions or mobile electrons.
Hence, no, [tex]PCI_3[/tex] is not a good conductor.
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Zinc chloride + Magnesium →
Answer:
im assuming you need the balanced equation
Explanation:
Zn + MgCl2 = ZnCl2 + Mg
Answer:
it will mgcl2 + zn
Explanation:
Mg will replace zn from its salt solution
to form mgcl2
hope it helps
