Answer:
Over hundreds of years
Explanation:
Just did the test and got it right
Over hundreds of years is the greatest time frame in which a short-term environmental change can occur. Hence, option C is correct.
What is the environment?The environment is the surrounding in which we live.
A short-term environmental change refers to changes in the environment that happens within a short period of time, for example, flooding, drought, volcanic eruptions etc.
In contrast to short-term environmental change, long-term environmental change takes place over a long period of time hence species have a longer time to adapt to it.
Short-term environmental changes may or may not be caused by humans. An example of a short-term environmental change caused by humans is oil spillage.
Short-term environmental changes may lead to the migration of species from the ecosystem.
Short-term environmental changes usually occur within a very short time. The greatest time frame in which a short-term environmental change can occur is a matter of days.
Only long-term environmental changes span hundreds and thousands of years.
Hence, over hundreds of years is the greatest time frame in which a short-term environmental change can occur.
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Which commercial technology commonly uses plasmas?
a radio
a race car
a television
a microwave oven
The correct answer is C. A television
Explanation:
Plasma is a particular state of matter that differs from liquid, solid, and gas because plasma is a gas but contains mainly particles that have lost their electrons or ions. This makes plasma have properties other states do not have. Additionally, plasma is now widely used in technologies, including televisions, this is because plasma is used in thousands of small containers to create the images in a Tv. This leads to high quality and precise images. Therefore, the commercial technology that commonly uses plasmas is a television.
Answer:
c
Explanation:
edge
When compound A (C5H12O) is treated with HBr, it forms compound B (C5H11Br). The 1H NMR spectrum of compound A has a 1H singlet, a 3Hdoublet, a 6H doublet, and two 1H multiplets. The 1H NMR spectrum of compound B has a 6H singlet, a 3H triplet, and a 2H quartet. Identify compounds A and B.
Answer:
attached here is the diagram of the solution
Explanation:
What volume of Co2 (carbon (iv) oxide)
will be produced when 10g of Na2Co3
(sodium trioxocarbonate (iv) reacted
with excess Hcl (Hydrogen Chloride) at
STP(Na=23, C=12, O=16)
Answer:
2.1056L or 2105.6mL
Explanation:
We'll begin by calculating the number of mole in 10g of Na2CO3. This can be obtained as follow:
Molar mass of Na2CO3 = (23x2) + 12 + (16x3) = 106g/mol
Mass of Na2CO3 = 10g
Mole of Na2CO3 =.?
Mole = mass /molar mass
Mole of Na2CO3 = 10/106
Mole of Na2CO3 = 0.094 mole
Next, we shall determine the number of mole CO2 produced by the reaction of 0.094 mole of Na2CO3. This is illustrated below:
Na2CO3 + 2HCl —> 2NaCl + H2O + CO2
From the balanced equation above,
1 mole of Na2CO3 reacted to produce 1 mole of CO2.
Therefore, 0.094 mole of Na2CO3 will also react to 0.094 mole of CO2.
Next, we shall determine the volume occupied by 0.094 mole of CO2 at STP. This is illustrated below:
1 mole of a gas occupy 22.4L at STP. This implies that 1 mole CO2 occupies 22.4L at STP.
Now, if 1 mole of CO2 occupy 22.4L at STP, then, 0.094 mole of CO2 will occupy = 0.094 x 22.4 = 2.1056L
Therefore, the volume of CO2 produced is 2.1056L or 2105.6mL
Explain the three states of matter on the basis of characteristics of particles/ molecules of matter.
Answer :
Explanation For The Three States OF Matter On the Basis OF Characteristics Of Particles / Molecules OF Matter.
Solid:In solids the molecules are closely packed . There is a strong force of attraction between the molecules and the space between them is very small (almost negligible). The molecules are , therefore, not free to move . They merely vibrate their mean positions . This makes solids hard and difficult to compress , giving them a fixed shape and size.
Liquid :In the case of liquids , the molecules are not closely packed. They do not attract each other as strongly as the molecules of solids. Thus, the intermolecular spaces are larger and the molecules are able to move about more freely . This makes liquid flow and take the shape of the container into which it is poured. Thus, liquids have a fixed volume but no definite shape of their own .
Gas :In the case of gases, the molecules hardly attract each other. They lie far a part from each other and the intermolecular spaces are, therefore, very large. . The intermolecular force of attraction is so weak that the molecules have great freedom of movement . As a result , gases have neither a fixed shapenor a fixed volume . They completely full up spacw available to them. They can be easily compressed as well, thus decreasing the gaps between their molecules .
Explanation :
Hope it works out !Name each of the following binary compounds or ionic compounds with polyatomic ions: 1. LiBr 2. Cal2 3. Al203 4. Mg3N2 5. FeCl2 6. FeCl3 7. Cu3N2 8. Ni2O3 9. Al(SO4)3 10. Ca3(PO4)2 11. Fe(OH)2 12. (NH4)2S 13. Na2O 14. NH3 15. SO42-
Answer:
Explanation:
1. LiBr - Lithium bromide
2. Cal₂ - Calcium iodide
3. Al₂0₃ - Aluminium oxide
4. Mg₃N₂ - Magnesium nitride
5. FeCl₂ Ferrous chloride [ Iron(II) chloride ]
6. FeCl₃ Ferric chloride [ Iron(III) chloride ]
7. Cu₃N₂ Copper nitride
8. Ni₂O₃ Nickel(III) oxide
9. Al(SO4)₃ Aluminium sulphate
10. Ca₃(PO4)₂ Copper phosphate
11. Fe(OH)₂ Iron (II) hydroxide
12. (NH4)₂S Ammonium sulphide
13. Na₂O Sodium oxide
14. NH₃ Ammonia
15. SO₄²⁻ Sulphate ion
HELP PLEASEE 100 POINTS
The Quiver tree grows in Southern Africa. Which of the following plant adaptations is likely to prevent these trees from dying out due to rising desert temperatures?
O Releasing a black powder onto their trunk to absorb more heat from sunlight
O Shifting their growing range towards the equator
Ability to store water in leafy structures to prevent excess evaporation
O Limiting seed dispersal to nearby locations
PLEASE HELP 100 POINTS !!
Answer:
Shifting their growing range towards the equator
Explanation:
Maybe will be like that
Answer:
Ability to store water in leafy structures to prevent excess evaporation.
Explanation:
The reason why plants die in hot temperature is the excess evaporation of water, so to prevent the excess evaporation of water, the plants get adaptive to store water in their leaves.
Hope it helps.
DETAILED Description on the applications of Nanochemistry.... about 100 words for each( note: has to be detailed)
Answer:
Explanation:
Nanochemistry is a branch of nanoscience, deals with the chemical applications of nanomaterials in nanotechnology.
Nanochemistry involves the study of the synthesis and characterisation of materials of nanoscale size.
2KCIO3 -- 2KCL+3o2 is a balanced equation
a) state what is a balanced equation
b) Give a reason why the above equation is balecand
Answer:
a) Balanced equation:
An equation is called balanced if there are same number and same type of atom on both sides of the equation.
b)Reason:
2KClO3--------2KCl + 3O2
Consider this equation in the reactants there are 2KClO3 and in the product there are 2KCl+3O2 . So reactants =products which is a case of balanced chemical equation .
Explanation:
CALCULATE THE VOLUME OF 16 g OF OXYGEN GAS AT S.T.P?
Answer:
To calculate the volume we must first find the number of moles
Number of moles (n ) = mass / Molar mass (M)
Since oxygen is diatomic
M of oxygen = 16 × 2 = 32g/mol
n = 16 / 32 = 0.5mol
Next we use the formula
V = n × V(dm³)
where V is the volume
V(dm³) is the volume of 1 mole of a substance at s.t.p which is
22.4dm³
Volume of oxygen gas at s.t.p is
0.5 × 22.4dm³
= 11.20dm³
Hope this helps you
The atomic size of sodium is smaller than that of the sodium why?
In which situation would hydrogen bonding be present?
A. When hydrogen exists as an ion in solution
B. When hydrogen is attached to C, S, or P
C. When hydrogen is attached to N, F or o
D. When hydrogen atoms bond together to form H2
Answer:
C
Explanation:
hydrogen Bond exists between ammonia, hydrogen flouride and water so the answer is C
how does altitude affect climate patterens in a region
Answer:
The distance above sea level. How does latitude and altitude affect climate? The altitude affects the climate because the higher the altitude, the cooler and harsher the climate. Also, if the latitude is to 0 degrees, the hotter the temperature and the more humidity in the atmosphere.
Explanation:
Which statement Ilustrates the difference between a chemical reaction and a nuclear reaction?
A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
A nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
A nuclear reaction releases more energy per gram but does not appear to violate the law of conservation of mass.
A nuclear reaction releases less energy per gram but does not appear to violate the law of conservation of mass.
Answer:
A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
Explanation:
In nuclear reactions there arises a shift in the nucleus of the atom. This results in the production of a different element altogether. While in chemical reactions the electrons are rearrangement and there is no change in the nucleus.Factors like temperature, pressure, and catalysts do not affect the rate of nuclear reactions while they influence the chemical reactions.The change in the energy is higher in nuclear reactions. It arises out of the destruction of mass.Answer:
A
Explanation:
Edge 2021
18. An electric motor turns a belt that powers a pump. If this system is compared to the chemical reactions of the cell, which part represents
ATP?
the electric motor
the pump
the belt
Answer:
A. the electric motor
Explanation:
A cell is a biological molecule which is the basic and functional unit of life. Cells undergo series of processes to function appropriately. ATP is an acronym for adenosine triphosphate, which is the source of energy for various cell processes.
In the given mechanical system, the electric motor provides the energy required energy to drive the system. Therefore, the electric motor has the same major function of providing energy for the system as the ATP in a cell.
WILL GIVE BRAINLIEST Which effect is one likely result of a forest fire? a. extinction b. adaptation c. speciation d. forced migration
Answer:
d. forced migration
Explanation:
Certain hazardous occurrences affect living organisms in their natural habitat. One of those occurrences is forest fire. Forest fire or vegetation fire is an uncontrollable break out of fire in a vegetation, affecting the inhabitants of the area.
The occurrence of a forest fire will lead to a forced migration of organisms from their natural habitat. Animals and other mobile organisms will be forced to leave behind their devastating habitat and migrate to a less threatened area in order to survive.
Answer:
D
Explanation:
The guy above is correct but I’m saying this for those who don’t want an explanation
Indicate whether each of these reactions is endothermic or exothermic.
NH4CI(S) - NHA" (aq) + Cl(aq) AHxn = 14.7 kJ
NaOH(s) Nat(aq) + OH (aq) AHixo = -44.5 kJ
CH2(g) + 2O2(g) CO2(g) + 2H20(g) Hrxn < 0
CH3COOH(aq) + NaHCO3(s) + CO2(g) + H2O(l) + Na"(aq) + CH3COO(aq)
AHxn > 0
Answer:
1. is endothermic
2. is exothermic
3. is exothermic (less than zero)
4. is Endothermic, greater than zero
Explanation:
The key to answering this is knowing how we interpret the values of delta H when given at the side of a reaction.
To know what the value of delta H means at that point, we should understand whether it is greater than zero or less than zero.
When it is greater than zero it is endothermic, when it is negative i.e less than zero it is exothermic
So;
1. is endothermic
2. is exothermic
3. is exothermic (less than zero)
4. is Endothermic, greater than zero
Answer:
First Blank: Endothermic
Second Blank: Exothermic
Third Blank: Exothermic
Fourth Blank: Endothermic
Fifth Blank: No
Explanation:
Edge '21
Atomic mass or weights are based on a scale on which carbon had an atomic mass of 12.00. Carbon and calcium combine in the ratio of 2:1 to form calcium carbide. If 22.75 g or calcium combine with 13.62 g carbon, what is the atomic weight do calcium? Show work.
Answer:
40.088 ≈ 40
Explanation:
We'll begin by calculating the number of mole in 13.62g of carbon. This is illustrated below:
Mass of carbon = 13.62g
Atomic weight of carbon = 12
Mole of carbon =..?
Mole = mass /atomic weight
Mole of carbon = 13.62/12
Mole of carbon = 1.135 mole
Next, we shall determine the number of mole of calcium needed to react with 1.135 mole of carbon.
This is illustrated below:
2C + Ca —> CaC2.
From the balanced equation above,
2 moles of C reacted with 1 mole of Ca.
Therefore, 1.135 mole of C will react with = (1.135 x 1)/2 = 0.5675 mole of Ca.
Therefore, 0.5675 mole of calcium, Ca is needed.
Now, we can determine the atomic weight of calcium as follow:
Mass of calcium = 22.75g
Mole of calcium = 0.5675 mole
Atomic weight of calcium =..?
Mole = mass /atomic weight
0.5675 = 22.75 / atomic weight
Cross multiply
0.5675 x atomic weight = 22.75
Divide both side by 0.5675
Atomic weight = 22.75 / 0.5675
Atomic weight = 40.088
Therefore, the atomic weight of calcium is 40.088
Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule? monosaccharide disaccharide monomer starch
Explanation:
lactose is disaccharide
because it contains 1 monosaccharide galactose +
1 monosaccharide glucose
The correct answer to the question is: disaccharide
Monosaccharides are simple sugar which can not be hydrolysed into simpler or smaller molecules.
Disaccharides are sugars produced by the condensation of two monosaccharides with the elimination of a water molecule.
monosaccharide + monosaccharide <=> Disaccharide + waterA Monomer is a small molecule which can combine with other similar molecules to form a large molecule called polymer. Thus, a monomer of starch is simply a small molecule that combines together to form a polysaccharide called starch. The monomer of starch is glucose.
Glucose and galactose combined to form lactose i.e
Glucose + Galactose => LactoseThe above is simply a demonstration of how disaccharides are produced.
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in the Leclanch dry cell ,which is electrolyte substance ?
Answer:
hey there,
ammonium chloride is the electrolyte substance in the Leclanche dry cell!
Explanation:
Which could cause topsoil to be lost? a) wind and water erosion b)lack of use c)compaction d)desertification
Answer:
Which could cause topsoil to be lost?
a) wind and water erosion
Explanation:
A natural and common cause of soil erosion is Water. Water can carry away tiny soil particles.
Raindrops can impact the soil surface and can break down the aggregates in soil and scatter them.
Water runoff is another cause of soil erosion and this occurs when water on a slope isn’t absorbed into the soil or becomes trapped on the surface.
Loose particles can be picked up and carried away by the wind.
Soil surfaces can be worn down when struck by airborne particles carried by the wind.
B. Lack of use of the top soil rather helps the top soil to regain its nutrients.
c. Compaction can the topsoil from losing particles, since there are no loose particles to be picked up.
D. Desertification mostly causes the soil to lose its nutrients, not go away completely.
Hope this helps!
Answer:
The correct answer is A
Explanation:
. The four metals, Strontium(Sr), Francium (Fr), Yttrium (Y), and Europium (Eu), in separate experiments, are dipped in aqueous solutions of SrNO3, FrNO3, Y(NO3)3, and Eu(NO3)2. The following results are obtained: 1. Yttrium metal does not react with any of the solutions 2. Strontium metal reacts with all of the other metals solutions 3. Francium metal reacts in a solution of Eu(NO3)2 a) List the four oxidizing agents in order from strongest to weakest by creating a small reduction table. Explain your reasoning below b) List the four reducing agents in order from strongest to weakest
Answer:
a) Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺
b) Sr > Fr > Eu > Y
Explanation:
Y is the least reactive metal because it does not react with any of the other solutions.
Sr is the most reactive metal because it reacts with all of the other solutions.
Sr + 2Fr⁺ ⟶Sr²⁺ + 2Fr
3Sr + 2Y³⁺ ⟶ 2Sr²⁺ + 2Y
Sr + Eu²⁺ ⟶ Sr²⁺ + Eu
Fr is more reactive than Eu because it reacts with Eu(NO₃)₂.
2Fr + Eu²⁺ ⟶ 2Fr⁺ + Eu
The order of reactivity is
Sr > Fr > Eu > Y
b) Reducing agents
In each of the above reactions. the more reactive metal is acting as a reducing agent — it is donating electrons to the cation of the other metal.
Thus, the order of activity of reducing agents is
Sr > Fr > Eu > Y
a) Oxidizing agents
The metal cations are the oxidizing agents.
The order of reactivity of the oxidizing agents is the reverse order of the reducing agents
Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺
c) Standard reduction potential table
See the image below.
A sample of gas (1.9 mol) is in a flask at 21 °C and 697 mmHg. The flask is opened and more gas is added to the flask. The new pressure is 795 mmHg and the temperature is now 26 °C. There are now __________ mol of gas in the flask.
Answer:
The new moles of the gas in the flask is 2.13 moles.
Explanation:
Given;
number of moles of gas, n = 1.9 mol
temperature of the gas, T = 21 °C = 21 + 273 = 294 K
pressure of gas, P = 697 mmHg
volume of gas, V = ?
Apply ideal gas law;
PV = nRT
Where;
R is gas constant, = 62.363 mmHg.L / mol. K
V = nRT / P
V = (1.9 x 62.363 x 294) / 697
V = 49.98 L
New pressure of the gas, P = 795 mmHg
New temperature of the gas, T = 26 °C = 273 + 26 = 299 K
New moles of the gas, n = ?
Volume of the gas is constant because volume of the flask is the same when more gas was added.
n = PV / RT
n = (795 x 49.98) / (62.363 x 299)
n = 2.13 moles
Therefore, the new moles of the gas in the flask is 2.13 moles.
what causes convection in currents in the air? a. the revolution of the earth around the sun. b. the rotation of the earth around itself. c. the heat on the surface of the earth. d. conversion of solid-gas directly
Answer:
THE HEAT ON THE SURFACE OF THE EARTH
Explanation:
Answer:
Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat.
Explanation:
1. Which of these items wastes sound energy?
-car radio
-alarm clock
-washing machine
-smartphone
Answer:
washing machine
Explanation:
the sound from a washing machine is not beneficial in any way
Do you
think a colony on Mars should be nearer the northern or southern
polar cap? Explain.
Answer:Hola TvT
Explanation:When the Martian polar caps were first viewed through telescopes, most scientists believed that they were made of water ice, like the polar caps on Earth. Like Earth, Mars has a North and South Pole. But while Earth's polar ice caps consist solely of water ice, Mars' polar caps are a combination of water ice and carbon dioxide ice. As the Martian seasons change, the carbon dioxide ice sublimates (vaporizes) in summer, revealing the surface, and freezes again in winter. As fall approaches, in each respective hemisphere, clouds begin to form over the polar region and the ice cap begins to grow. In spring, the polar caps recede...........Aside from ice, Mars' polar regions have some interesting geologic features. The north polar dune field is a vast concentration of sand dunes that stretches around the entire north polar cap. In some areas, the sand measures up to 500 km (300 miles) across. When the dunes begin to thaw in spring, dark spots form on their surfaces. The north polar dunes were first seen during the 1972 mapping of Mars by Mariner 9, and they are identical to dunes in Earth's desert regions..
bye bye UnU
What is the name of the Group 17 elements ?
Answer:
Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
The name of the Group 17 elements is called halogens
What is the name of group 17 elements?The group 17 elements are very reactive elements. Members of this group include:
Fluorine (F)Chlorine (Cl)Bromine (Br)Iodine (I)Astatine (At)The group 17 element are known to produce salts as they react with metals. Hence, they are called halogens
The group 17 elements are have 7 valence electrons and they required one electron to attain the stable octet configuration of the noble gas family.
From the above, we can see that the name of group 17 elements is halogens
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why aqueous solution of ethanol does not conduct electricity while an aquoes solution of ethanoic acid conducts electricity
Answer:
Explanation:
because ethanoic acid dissocaites into H+ and actetate ion so there is positive and negative chaeges to carry the electrons while ethanol only got evenly distributed in the water.
write down the position of metals,non metals and metalloids in the modern periodic table
Answer:
the position of metal is in left side non metal in right side and metalloids are on remaining positions.
Answer:
Explanation:
When looking at the periodic table, it's important to consider that all the metals are at the left side of the periodic table (Except for Hydrogen). The right side of the periodic table are all nonmetals. The border between metals and nonmetals are the zig-zag lines you can see which contains metalloids elements (Boron, Silicon, Germanium, Arsenic, Antimony, Tellurium, Polonium, and Astatine all appear to have the zig-zag line).
Hope this helps!
Which topic is commonly used to explain activation energy and how chemical reactio
reaction rate
collision theory
velocity distribution
spontaneous reaction
Answer:
The answer is collision theory
I hope this helps you.
At 127°c,400ml of a gas exerts a pressure of 120 torr. What would be the pressure exerted by 200ml of a gas if the temperature decrease to 27°c?
Answer:
180 Torr.
Explanation:
Step 1:
Data obtained from the question. This include the following:
Initial temperature (T1) = 127 °C
Initial volume (V1) = 400 mL
Initial pressure ( P1) = 120 Torr
Final volume (V2) = 200 mL
Final temperature (T2) = 27 °C
Final pressure (P2) =..?
Step 2:
Conversion of celsius temperature to Kelvin temperature.
This is illustrated below:
Temperature (Kelvin) = Temperature (celsius) + 273
T(K) = T(°C) + 273
Initial temperature (T1) = 127 °C
Initial temperature (T1) = 127 °C + 273 = 400 K
Final temperature (T2) = 27 °C
Final temperature (T2) = 27 °C + 273 = 300 K
Step 3:
Determination of the final pressure.
This can be obtained by using the general gas equation as shown below:
Initial temperature (T1) = 400 K
Initial volume (V1) = 400 mL
Initial pressure ( P1) = 120 Torr
Final volume (V2) = 200 mL
Final temperature (T2) = 300 K
Final pressure (P2) =..?
P1V1/T1 = P2V2/T2
120 x 400/400 = P2 x 200/300
120 = P2 x 2/3
Cross multiply
P2 x 2 = 120 x 3
Divide both side by 2
P2 = (120 x 3)/2
P2 = 180 Torr.
Therefore, the new pressure exerted by the gas is 180 Torr.