Answer:
D. all of the above
Explanation:
edg 2021
A way that human modification of limiting factors causes unbalances in ecosystems. are habitat loss, pollution, and climate change. Option D. This is further explained below.
What is an ecosystem.?Generally, An ecosystem is a geographical region in which plants, animals, and other species, as well as weather and topography, coexist to produce a circle.
In conclusion, habitat loss, pollution, and climate change are all human modification of limiting factors causes unbalance in ecosystems.
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CQ
which of the following is a way that human modification of limiting factors causes unbalance in ecosystems? a. habitat loss b. pollution c. climate changes d. all of the above
In which direction is this wave traveling?*
(1 Point)
A. up
B. down
C. to the left
D. to the right
Answer:up
Explanation:
Please help ..
What is the molarity of a 0.30-liter solution containing 0.50 moles of H2SO4?
A 1.7M
B 0.6M
C 0.8M
D 0.15M
Answer:
1.7M
Explanation:
Given parameters:
Volume of solution = 0.3L
Number of moles = 0.5moles
Unknown:
Molarity = ?
Solution:
The molarity of a substance is the number of moles of solute that can be found in the volume of a solution.
Molarity = [tex]\frac{number of moles }{volume}[/tex]
Insert the parameters and solve;
Molarity = [tex]\frac{0.5}{0.3}[/tex] = 1.7M
mass in grams of 3.32 mol k
Answer:
129.8 grams
Explanation:
Im a bit confused of what your are asking but if your are asking the mass in grams of K (Potassium) it is very easy dont worry
You multiply mols x Molecular weight.
So
3.32x 39.1= 129.8 grams
. For the reaction 2HNO3 + Mg(OH), → Mg(NO3)2 + 2H20, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO,?
Mass of Magnesium nitrate produced : 593.2 g
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
2HNO₃ + Mg(OH)₂ → Mg(NO₃)₂ + 2H₂0
mol HNO₃ = 8
From the equation, mol ratio of HNO₃ : Mg(NO₃)₂ = 2 : 1, so mol Mg(NO₃)₂ :
[tex]\tt \dfrac{1}{2}\times 8=4~moles[/tex]
Mass Mg(NO₃)₂(MW=148,3 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=4\times 148,3 g/mol\\\\mass=593.2~g[/tex]
You need 150g of pure lithium for an experiment you're doing. You have 675g of lithium oxide (Li2O). Can you extract all the lithium you need from the amount of compound you have? Show your reasoning.
Answer: Yes we can extract all the lithium from the amount of compound we have.
Explanation:
To calculate the moles :
[tex]moles=\frac{\text {given mass}}{\text {Molar mass}}[/tex]
[tex]\text{Moles of} Li=\frac{150g}{7g/mol}=21.4moles[/tex]
[tex]\text{Moles of} Li_2O=\frac{675g}{30g/mol}=22.5moles[/tex]
[tex]2Li_2O\rightarrow 4Li+O_2[/tex]
According to stoichiometry :
2 moles of [tex]Li_2O[/tex] produce 4 moles of [tex]Li[/tex]
Thus 22.5 moles of [tex]Li_2O[/tex] will produce=[tex]\frac{4}{2}\times 22.5=45moles[/tex] of Li
As 21.4 moles is a lesser quantity than 45 moles, thus it can be produced
Yes, you can extract all the lithium you need from the compound
We'll begin by calculating the mass of lithium, Li in 1 mole of Li₂O. This can be obtained as described below:
1 mole of Li₂O = (2×7) + 16
1 mole of Li₂O = 14 + 16 = 30 g
SUMMARY
30 g of Li₂O contains 14 g of Li.
With the above information in mind, we can determine the mass of Li in 675 g of lithium oxide, Li₂O. This can be obtained as follow:30 g of Li₂O contains 14 g of Li.
Therefore,
675 g of Li₂O Will contain = (675 × 14)/30 = 315 g of Li.
From the calculation made above, we can see that there are 315 g of Li in 675 g of Li₂O. Thus, we can conclude that 150 g of Li can be extracted from the compound (i.e 675 g of Li₂O)Learn more: https://brainly.com/question/15381525
The name for the ionic compound CoHPO4
Answer:
Dicalcium phosphate. (I'm sure meant for the "o" to be an "a" for Calcium).
Explanation:
I hope this helps! :D Have a nice night!
I will mark brainliest
Answer:
d
Explanation:
it's the only one that seems to make sense
Match each type of mass movement to its description.
the rapid downhill flow of a mixture of rock,
soil, and water
slump
mudflow
the slow downhill movement of rock and soil
creep
the rapid downhill movement of a mass of
rock, debris, or soil
landslide
a loosely connected mass of rock and soil
that moves a short distance
Answer: np
Explanation:
Correctly matched are :
landside - rapid movement of rock, debris, and soil. mudflow - mixture of rocks, soil, water. slump - loosely mass of rocks and soil.What is a landslide?A landslide is also called a land slip. It refers to several forms of mass wasting and may include a wide range of ground movements. They occur in a variety of environments characterize by gentle and steep slope gradients.
The mudflow is a mixture of rocks and soil along with water. While a creep is a slow downloads movement of rocks and soil.
Find out more information about the mass movement.
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How do the number of protons, rumber of neutrons, and the mass number relate to each other
Answer:
Protons are the atomic number and for each element they never change.
Electrons are equal to the atomic number unless it is an Ion (Positive charge means it has less negative means it has more)
Mass number is Protons+Nuetrons
Explanation:
calculate the percentage of iron in iron (III) sulphate
Answer:
28.01 percent
Explanation:
Iron (III) sulphate, [tex]Fe_2(SO_4)_3[/tex], has 2 atoms of Fe.
One atom of Fe has a molar weight of 56. Hence, 2 atoms of Fe would have a total molar weight of 56 x 2 = 112 g/mol
Molar weight of [tex]Fe_2(SO_4)_3[/tex] = 399.88 g/mol
Percentage Fe in [tex]Fe_2(SO_4)_3[/tex] = 112/399.88 x 100%
= 28.01%
The percentage of iron is iron (III) sulphate is, therefore, 28.01 percent.
What volume (liters) of aqueous 0.325 M nitric acid is required to react completely with 3.68 g barium hydroxide?
Volume (liters) of aqueous 0.325 M nitric acid is 0.132 L
Further explanationReaction
2HNO₃ + Ba(OH)₂ → Ba(NO₃)₂ + 2H₂O
mass of Ba(OH)₂ = 3.68 g
mol Ba(OH)₂(MW=171,34 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{3.68}{171,34 g/mol}\\\\mol=0.0215[/tex]
From the equation, mol ratio of HNO₃ : Ba(OH)₂ = 2 : 1, so mol HNO₃:
[tex]\tt mol~HNO_3=\dfrac{2}{1}\times 0.0215=0.043[/tex]
Molarity of HNO₃ = 0.325, then the volume of HNO₃ :
[tex]\tt V=\dfrac{n(mol)}{M(molarity)}\\\\V=\dfrac{0.043}{0.325}\\\\V=0.132~L[/tex]
Marcel conducts an experiment to test which stain remover works best on mustard stains. He wants to make sure that he does not make mistakes and has correct data in his experiment. What should Marcel do to make sure that his data are correct? conduct a similar experiment with a different washing machine ask other students to conduct related experiments at their homes ask his sibling to conduct the same experiment using his washing machine repeat the experiment several times with the same variable and constants
Answer: Repeat the experiment several times with the same variable and constants.
Explanation: The experimental procedure should be performed many times so as to determine the effect of the stain remover on mustard stain in different conditions and while using different variables such as water and type of machine used. This will tell how useful the stain remover in all conditions provided to check the accuracy of the stain remover.
Hope this help!!! :)
Answer:
C
Explanation:
if his brother does the expire end it is replication if he was to do the same expirement with the same variables then the same outcome would come out
Elena makes the table below to determine the number of atoms of each element in the chemical formula 3(NH4)2SO4. A table with 3 columns and 4 rows. The first column labeled element has entries nitrogen, hydrogen, sulfur, oxygen. The second column labeled calculation has entries 1 times 2 times 3 , 4 times 2 times 3, 1 times 4 times 3, 4 times 3. The third column labeled total atoms has entries 6, 24, 12, 12. What mistake did Elena make? She should not have multiplied the sulfur atoms by the subscript 4. She should not have multiplied the nitrogen atoms by the subscript 2. She should not have multiplied the oxygen atoms by the coefficient 3. She should not have multiplied the hydrogen atoms by the coefficient 3.
Answer:
c
Explanation:
because i got 100 on the quiz
Answer: A) She should not have multiplied the sulfur atoms by the subscript 4
Explanation: got an 100 on the quiz:)
The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character. Which group has the greatest metallic character?
Answer:
Group 1 metals or the alkali metals
Explanation:
The group 1 elements are all metals except for hydrogen, the first element in the group. Group 1 metals have one valence electron in their outermost shell. The metallic character increases as one goes down the group.
The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character. Group 1 metals have the greatest metallic character due to the ease with which they donate or lose their one valence electron. As the atomic radius increases on going down the group, their metallic character increases. Also, due to screening effect of the inner electrons on the valence electron from the positive nuclear charge of the nucleus, metallic property increases on going down the group.
What is the order of complexity of solids from least to greatest?
Explanation:
The solids can be classified on the basis of bond they are joined with. There are four types of solids on the basis of bond. There are four type of crystalline solids: namely, molecular solids, network solids, ionic solids, and metallic solids. The molecular and the structure of the solid determines its properties likes conductivity, solibility, heat conductivity, and density. Solids are incompressible and rigid as there molecules are fixed in place.
Answer:
Atoms, Molecules, Extended Structures, and Substances
Explanation:
High arky of solids
Which element has the smallest atomic radius?
A-Na
B-H
C-Li
D-K
Answer:
B Hydrogen
Explanation: Hydrogen is the smallest element.
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.
Explain why, in a balanced chemical equation C + O2 CO2, we know that 1 gram of C will not react exactly with 1 gram of O2.
Answer:
See the answer below
Explanation:
From the equation, 1 mole of C requires 1 mole of O2 for a balanced reaction.
1 g of C will not exactly react with 1 g of O2 because the 1 g of each of the reactants contain different amounts of the substance.
The amount (in moles) of a substance is the mass of that substance divided by the molar mass.
Hence, 1 g of C will contain 1/12 moles of the substance while 1 g of O2 will contain 1/32 moles of the substance.
A 1.87 mol sample of Ar gas is confined in a 45.5 liter container at 23.6 °C.
If the temperature of the gas sample is raised to 46.1 °C holding the volume constant, the average kinetic energy will
a. increase
b. remain the same
c. not enough information to answer the question
d. decrease
Answer:
a. increase
Explanation:
Based on the kinetic molecular theory of gases, the average kinetic energy of the system will increase.
The average kinetic energy is heat If temperature increases, heat of a system will also rise. According the kinetic molecular theory "the temperature of the gas is a measure of the average kinetic energy of the molecules"Therefore, due to the increase in temperature, the average kinetic energy of the system increases.
Write one equation each for the decomposition reactions where energy is supplied in the form of (a) electricity and
Answer:
Electrolysis of water
Explanation:
The electrolysis of water is a decomposition reaction in which electricity is used to break down a compound into simpler molecules.
Decomposition of water is carried out in the Hofman Voltameter.
This process is achieved by passing current through an acidified water.
The expression is given as:
2H₂O → 2H₂ + O₂
CHOOSE ONE AND I WILK GIEV YOU BRAINLIEST AND DONT GUESS PLEASE!!!..
Answer:
c
Explanation:
Which order shows decreasing wavelength?
gamma → ultraviolet → infrared → radio
infrared → gamma → radio → ultraviolet
radio → infrared → ultraviolet → gamma
ultraviolet → radio → infrared → gamma
Answer:
The answer is c radio --> infrared --> ultraviolet --> gamma
Explanation:
I just did it
Answer:
C
Explanation:
just did it
1-calculate the mass of 4 moles of Na
2-what is the mass of 0.3 moles of water H2o H:1 O:16
3-compute the number of moles found in 10g of ethanol C2H5OH C:12 O:16
please help me as fast you can
1. 92 g
2. 5.4 g
3. 0.217 moles
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt n=\dfrac{m}{MW}[/tex]
1. the mass of 4 moles of Na(MW= 23 g/mol)
[tex]\tt mass=mol\times MW\\\\mass=4\times 23\\\\mass=92~g[/tex]
2. the mass of 0.3 moles of water(MW=18 g/mol)
[tex]\tt mass=mol\times MW\\\\mass=0.3\times 18\\\\mass=5.4~g[/tex]
3. the number of moles found in 10g of ethanol C2H5OH(MW=46 g/mol) :
[tex]\tt mol=\dfrac{10}{46}\\\\mol=0.217[/tex]
Write the names of the following covalent compounds: no2
Answer:
nitrogen dioxide
Explanation:
this was on my chemistry test
A pH of 1 there are a lot of ______ in a solution. 2.A pH of 14 there are a lot of ______ in a solution.
Answer:
Hydrogen or hydroxonium ions in the solution
Hydroxyl ions in the solution
Explanation:
A pH of 1 shows there is a lot of hydroxonium ions in the solution and a pH of 14 shows there is a lot of hydroxyl ions in the solution.
The pH scale ranges from 1 to 14 As the values tends towards 1, the acidity increases due to concentration of hydroxonium ions in the solution. As the pH tends towards 14, the basicity increases due to the concentration of hydrogen ions in the solution.40 POINTS PLS HELP!
1. A description of what genetically modified foods are.
2. A list of crops that are typically genetically modified.
3. An explanation of why crops are genetically modified.
4. A description of how crops are genetically modified.
5. A list of how genetically modified crops affect society and the environment.
___________________________________
Same as top but these are questions:
1. What are genetically modified foods?
2. What crops are typically genetically modified?
3. Why are crops genetically modified.
4. How are crops genetically modified?
5. how do genetically modified foods affect society in the environment.
___________________________________
And PLS, don't use this just for points!
Thank you!
Answer:
1. Foods that have changes that are chemically introduced.
2. corn soybeans apples etc
3. sot they last longer or look better
4. new dna is placed in them and their seeds
5. they are not as good for humans
Explanation:
Complete Symbols
Find each of these:
a) number of protons
b) number of neutrons
c) number of electrons
d) atomic number
e) mass Number
80Br35
Answer: a) 35 , b) 45 , c) 35 , d) 35 , e) 80
Explanation:
a) - protons equal to atomic number of element , b) - subtract atomic number by number of protons to get neutrons (80 - 35 = 45) , c) - protons same as electrons unless its an ion , d) - atomic number is equal to protons , e) - protons plus neutrons equal mass number (35 + 45 = 80). :)
What is the name of cells that have the ability to develop into different
kinds of cells?
Answer:
stem cells
Explanation:
hope it helps
Explain why Ra is larger than Be. With 2 points.
Explanation:
Radium(Ra)=>atomic number=88
BERYLLIUM (Be)=>atomic number =4
why is Ra larger than Be
1. since the atomic number of Ra is greater than Be, the number of electrons is more, which means there are more number of shells present in Ra than Be. (atomic Radius)2. the more the valence electron (excluding fully filled ones) the less is the nuclear attraction forcesince Ra has more valence electron in its outermost shell, the nuclear attraction force is less which means that Ra 's size is greater than Be.hope it helps:)
Why does the reaction proceed more quickly when the surface area is increased?
The reaction proceed more quickly when the surface area is increased because the frequency of collision increases.
What is Collision theory?Collision theory states that for a chemical reaction to proceed, it should achieve these conditions-
Molecules/atoms must collideThe particles must collide in right orientationThe particles must collide with enough energyIncreasing the surface area increases the probability of effective collisions. It thus increases the probability of the three conditions being achieved and results into increase in the frequency of collision and thus increases the rate of reaction.
Therefore, the reaction proceed more quickly when the surface area is increased because the frequency of collision increases.
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