I NEED THE AWNSER RIGHT NOWWWWW Four students categorized several environmental changes as short-term or long-term changes. Which chart correctly categorizes short- and long-term changes?
Answers
Based on the duration and effect of the environmental change, the correct categorization is as follows:
Short-term changes - Fire, flood, pollution of waterways, disease Long-term changes- extinction, early frost, deforestation, desertificationWhat are environmental changes?Environmental changes refers to changes that occur in the environment either due to natural causes or by human activities.
Environmental changes can be categorized into:
short-term changes andlong-term changesShort-term changes occur over a short period of time while long-term changes occur over a long period of time.
Based on the chart, the correct categorization is as follows:
Short-term changes - Fire, flood, pollution of waterways, disease Long-term changes- extinction, early frost, deforestation, desertificationTherefore, both long-term and short-term changes occur in the environment.
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Related Questions
What are two ways continents can grow?
Answers
Answer:
What are three ways continents get bigger?
age of rocks.
fossils.
evidence of melting (subduction)
location on current continents.
glacial deposits.
Pls help A student studies the effect of an object's height on its amount of gravitational energy. This graph summarizes the data from the study. Which statement best describes what the graph shows? A. As height increases, gravitational energy decreases. B. As height increases, gravitational energy increases. C. As height increases, gravitational energy increases exponentially. D. As height increases, gravitational energy decreases exponentially.
Answers
Answer:
B, as height increases gravitational energy increases
What are the three major branches of natural science?
• Earth and space science, life science, physical science
•Earth and space science, physical science, chemistry
•Physical science, life science, chemistry
•Life science, chemistry, physics
Answers
Explanation:
The three major branches of natural science are1.Physical,the study of universe.2.Chemistry,the study of matter.3.Biology,the study of life and living or organisms.have a good day.I hope this answer can help youAnswer:
here:)
Explanation:
Natural Sciences is the core of the branches of science as studies the nature of our physical world and the universe. The three branches of Natural Sciences are:
Physics, the Study of Universe.
Chemistry, the Study of Matter.
Biology, the Study of Life and Living Organisms.
What increases the rate a solute dissolves in a solvent.
Answers
Answer:
Stirring
Explanation:
Stirring a solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent. For example, when you add sugar to iced tea and then stir the tea, the sugar will dissolve faster.
Answer:
crushing particles of solute
Explanation:
Use Lewis symbols to predict the formula for the
compound that forms between magnesium and
nitrogen
Answers
The lewis structure of Magnesium nitride places eight electrons around N. 3 of these electrons are provided by Mg to get a stable conformation.
What is the Lewis structure?The Lewis structure is a representation of electron pairs in bonds between the atoms that compose the molecule. It can also show the solitary electron pairs that remain for each atom.
Electrons
When adding the valence electrons of each atom, we get the total number of electrons in the molecule.
The valence value is the number of electrons placed in the last energetic level of the atom.
The compound that forms between magnesium and nitrogen is magnesium nitride, Mg₃N₂. This is a simple salt with an ionic bond between a metal and a non-metal element.
What are the Metalic atoms?They are elements that express a tendency to lose valence electrons to get a stable electronic configuration. When they lose electrons, they remain positively charged. These are cations with positive charges and lose the valence electrons of their last level.
Mg has 2 electrons in its last level, so to get a complete stable configuration (2e-), it needs to lose 2 electrons.
Mg has two positive charges Mg ²⁺
What are the non-metalic atoms?They are elements that gain electrons to complete their last level. These are the anions. When they get electrons, they remain negatively charged.
Because Nitrogen has 5 electrons in its last level, it needs to add 3 electrons. In this way, it gets to the complete stable configuration (8e-).
N has three negative charges N³⁻
So, to complete the Lewis structure, we need to add Mg ²⁺ and N³⁻.
We know that
Mg loses two electrons,N needs to add three electrons.According to this, N needs more than one Mg to complete its last level.
So, in our calculations, we need to have three Mg and two N.
Two N need six electrons (-3e- x 2 = -6e-) to complete their last levelThree Mg can provide six electrons (+2e- x 3 = +6e-)You will find the final Lewis structure in the attached files.
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A radioactive element has a half-life of six days. What is the approximate decay rate of the element after the first day? 0. 9% 1. 5% 8. 3% 10. 9%.
Answers
A radioactive element has a half-life of six days then the approximate decay rate of the element after the first day is 8.3%.
What is the half life time?Half life time is that time during which half of the concentration of reactant will changed into the product.
According to the question:
In 6 days = 50% of the reactant will change into product
In 1 day = 50%/6 of the reactant will change into product
So, in 1 day = 8.3% of the reactant will change into product
Hence option (3) is correct.
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what is double displacement reaction
Answers
Answer:
A salt metathesis reaction, sometimes called a double displacement reaction, is a chemical process involving the exchange of bonds between two reacting chemical species which results in the creation of products with similar or identical bonding affiliations.
Explanation:
From: Wikipedia
Calculate the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 ml solution.
Answers
Taking into account the definition of molarity, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 [tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity in this caseIn this case, you have:
number of moles= 0.2 molesvolume= 100 mL= 0.1 LReplacing in the definition of molarity:
[tex]molarity=\frac{0.2 mole}{0.1 L}[/tex]
Solving:
molarity= 2 [tex]\frac{moles}{liter}[/tex]
Finally, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 [tex]\frac{moles}{liter}[/tex].
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Water is a ______ molecule and the bond between the h-o is a __ ______ bond.
i know the last 2 is polar covalent bond but i don't know
the first blank.
Answers
Answer: polar molocule
Explanation:
What can be told about the age of the fossils in the diagram?
A.
The fossils in layer 5 are the oldest, and the fossils in layer 1 are the youngest.
B.
The fossils in layer 1 are the oldest, and the fossils in layer 5 are the youngest.
C.
All of the fossils are the same age because they were all present during the same period.
D.
Nothing about the ages of the fossils can be determined from the diagram.
Answers
What is density? (1 point) the amount of space occupied by a substance or body O the quantity of matter contained in a substance or body o the amount of heat contained in a body o the degree of compactness of a substance
Answers
Answer:
density answer IS ....
What do dark read areas indicated on the map?
Answers
Answer: Classifies cultural features, such as populated areas, main roads, and boundaries, on older maps.
Hello people ~
One of the advantages of nylon over rayon is that nylon:
A. Is wrinkle free.
B. Has low elasticity
C. Is a natural fibre
D. Is a good conductor of electricity
Answers
Answer:
I think it is D.
Explanation:
Sry if I am wrong...
Answer:
wrinkle free
Explanation:
Nylon fabric is easy to wash so it's wrinkle free.Nylon is highly elastic and waterproof fabric.So it's highly used by mountaineers .Hello people ~
Which of the following reactions can also be termed as thermal decomposition reaction?
(a) Combination Reaction
(b) Decomposition Reaction
(c) Displacement reaction
(d) Double displacement reaction
Answers
Answer:
Decomposition reaction
Explanation:
When a single reactant is decomposed into two or more products that reaction is called decomposition reaction.
Thermal decomposition usually refers to exothermic reactionA lots of amount of heat is released in thisOption B is correct
Explain what the color change indicated about the changes in the concentrations of Co(H2O) 6 2+ and CoCl 4 2- in each trial?
Answers
The color of the system will change between pink and blue depending on the concentration of species.
What is equilibrium?Equilibrium is attained in a reaction when the rate of forward reaction is equal to the rate of reverse reaction. Now consider the equilibrium;
Co(H2O)6^2+(aq) + 4Cl^-(aq) ⇄ CoCl4^2-(aq) + 6H2O(l)
We know that Co(H2O)6^2+(aq) is pink while CoCl4^2-(aq) is blue hence, if the concentration of the species are changed, the color of the system will change accordingly.
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What does an electromagnetic spectrum refer to?
Answers
Stirring iced tea mix into water is a chemical change?
Answers
Answer:
true
Explanation:
it changes the chemicals in the water and adds new ones
What type of energy is shown in the circled portion of the graph? *
Answers
Answer:
Thermal Energy
Explanation:
Energy that is dissipated or absorbed as heat is in the form of thermal energy.
Why water is known as the "universal solvent?"
A. Because of water's polarity, it is not able to dissolve or dissociate many particles.
B. Because water is a polar molecule, it is able to dissolve or dissociate many particles.
C. Because water is a nonpolar molecule, it is able to dissolve or dissociate many particles.
Answers
A. I not sure kinda. Hopefully it's correct
What color should appear when a properly cleaned nichrome wire is introduced into the flame?.
Answers
Answer: The color that will appear when the nichrome wire is properly cleaned and introduced into flame would be orange
During the course of a catalytic reaction the following occurs: 1) Substrate is covalently bound and oriented with proximity to the active site residues. 2) Negative charge builds up on the substrate and is stabilized. 3) Oxidation of the enzyme followed by reduction to complete the catalytic cycle. What type of chemical species can facilitate these reactions? A) nucleophilic amino acids B) electrophilic groups C) prosthetic phosphate groups D) transition metal anions E) transition metal cations
Answers
During the course of a catalytic reaction Substrate is covalently bound and oriented with proximity to the active site residues.
The type of chemical species which can facilitate these reactions is transition metal cations.
What is an Enzyme?These are proteins that act as biological catalysts and accelerate chemical reactions.
They function by binding to the substrate and requires the use of transition metal cations which acts as cofactors.
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Identify the equations that show ionization. check all that apply. upper n a upper c l (s) right arrow upper n a superscript plus (a q) plus upper c l superscript minus (a q). upper h upper c l (g) plus upper h subscript 2 upper o (l) right arrow upper c subscript 3 upper o superscript plus (a q) plus upper c l superscript minus (a q). upper o subscript 2 (g) right arrow upper o subscript 2 (a q). upper c upper o subscript 2 (g) plus 2 upper h subscript 2 upper o (l) right arrow upper h upper c upper o subscript 3 superscript minus (a q) plus upper h subscript 3 upper o superscript plus (a q). upper c a upper c l subscript 2 (s) right arrow upper c a superscript 2 plus (a q) plus 2 upper c l superscript minus (a q).
Answers
When an atom gains or donates electrons to form an ion is called ionization. Hydrochloric acid with water and carbon dioxide with water are the ionization reaction.
What are Ionization reactions?In ionization reactions, the chemical species undergo changes to gain or lose electrons to acquire charge.
The reaction between hydrochloric acid and water to yield hydronium ion and chloride ion, and the reaction between carbon dioxide and water to yield hydronium ion and bicarbonate ion is the example of ionization as electrons are donated and gained by the species.
Therefore, the ionization reaction results in the gain or loss of electrons.
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Answer:
B and D just did it
Explanation:
If the freezing point depression for a solution is 2. 5°c and kf = 4. 5°c/m, what is the molality of the solution?
Answers
Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.
What is the freezing-point depression?Freezing-point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.
The freezing-point depression for a solution is 2. 5 °C. We can calculate the molality of the solution using the following expression.
ΔT = Kf × b
b = ΔT / Kf = 2.5 °C / (4.5 °C/m) = 0.56 m
where,
ΔT is the freezing-point depression. Kf is the cryoscopic constant of the solvent.b is the molality of the solution.Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.
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The molality of a solution will be 0.56 m. if the freezing point depression for a solution is 2.5° C.
What is molality?Molality is the measure of the moles of any solute in a solution per unit kg of the solvent.
Given, the freezing-point depression for a solution is 2. 5 °C
The kf is 4.5° c/m
[tex]\rm \Delta T = Kf \times b\\\\b = \dfrac{\Delta T}{kf} \\\\b = \dfrac{2.5^ \circ C}{4.5 \circ C/m} = 0.56 m[/tex]
Where T is freezing point depression
kf is cryoscopic constant of the solvent
b is molality of the solution
Thus, the molality of the solution is 0.56 m.
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Perform the following operation
and express the answer in
scientific notation.
9.2x10^7 ÷ 3.7x10^9
Answers
Answer:
coefficient green : 2.4865
exponent (yellow) : 16
Explanation:
A student used 1.2 g of hydrate in the first trial and 1.6 g in the second trial. Explain fully why her mass percent of water will be the same for both trials even though she used more hydrate in the second trial. (Do not simply state that the mass percent is an intensive property ).
Answers
Both trials of 1.2 g and 1.6 g will have the same mass percent of water because the ratio of the salt to the water of hydration is always constant for any hydrated salt.
Water of hydrationFor every hydrated salt, the ratio of the salt to the water of hydration remains constant irrespective of the amount of salt taken for experimental analysis.
For example, assuming the mass percent of water in 10g of a hydrated salt is 40%, if 100g of the same salt is taken, the mass percent will remain 40%.
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Will autoionization of water be spontaneous at high temperatures
Answers
Answer:
100
Explanation:
Will autoionzation of water be spontaneous at high temperature
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When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion?
A. Random combustion
B. Rapid combustion
C. Spontaneous combustion
D. Explosion
Answers
D. explosion
When a cracker is lit, a rapid response results in the development of large amount of energy of heat, light, and sound. Explosion is the term for such a reaction.
Answer:
D. Explosion
Explanation:
Here, we want to identify the type of combustion characterized by the given properties
From what we have, there is a sudden reaction that takes place as the cracker is ignited
The type of combustion here is called Explosion
It takes place suddenly with the evolution of light, heat, and sound upon ignition.
Hope this helps!
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Place the following in order of decreasing radius.
Te2- F- O2-
Answers
Answer:
Option 2 is correct.
Name two elements that are extracted from
their compounds by electrolysis.
Answers
Answer:
Hydrogen and oxygen
Explanation:
This is the most common compound water
When water goes through electrolysis it produces two elementsH_2 and O_2The reaction is given by
H_2O-->H_2+O_2Answer:
Hydrogen and helium is the answer
Using the data below, what would be the independent variable?
Height of foam
Type of soda
Number of mentos
Color of mentos
Answers
Answer:
Number of mentos
Explanation:
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