Answer:
An unconformity is a widespread surface separating rocks above and below, which represents a gap in the rock record. Unconformities occur when either erosion wears away rocks, or rock deposits never form. Therefore, a time gap exists between when the rocks below the unconformity formed and when those above it formed.
Explanation:
what is the best "determiner" for identifying if it is a metal?
I need the answer please
Answer:
determiner is a word that introduces a noun or provides information about the quantity of a noun.
Explanation:
The metal cans are recyclable. (determiner before the adjective describing a plural noun to specify which cans)
Metal cans are recyclable. (no determiner because it's optional for plural nouns and noun phrases)
is respiration like burning?Explain your answer.
Answer:
Yes
Explanation:
The process of respiration and burning are similar in the following ways: Both respiration and burning require oxygen. Energy is released during both respiration and burning. The products produced (carbon dioxide and water) are the same for both respiration and burning.
Answer:
Yes
Both Respiration and Burning uses oxygen. Both Respiration and Burning produces energy. Both Respiration and Burning gives out carbon dioxide as the end product. The overall chemical reactions of both Respiration and Burning are the same.
Explanation:
Please mark me brainliest if correct
Two groups of students tested to compare their speed working math problems. Each group was given the same problems. One group used calculators and the other group computed without calculators.
Independent variable:
dependent variable:
controlled variable:
Answer:
The independent variable is the calculator
The dependent variable is the speed of solving the problem.
The constant variable is the same set of problems that were assigned to two groups of students.
The dependent variable is the one that is being tested by experimentation. The dependent variable depends on the independent variable.
The independent variable can b changed by the experimenter whereas the constant variable remains unchanged throughout the experiment.
Answer:
Controlled Variable: The same math problems
Dependent Variable: The amount of time taken to answer
Independent Variable: One group using calculators and the other group not using calculators.
Explanation:
The dependent variable is the variable being tested and the independent variable is what is being changed. The controlled is what is staying the same.
Which plants have a fibrous root system? (Select all that apply.) grass dandelion carrot corn
The plants which have a fibrous root system are
GrassCornWhat is a fibrous root?A fibrous root system is a root system which consists of large mass of roots of nearly equal size
Some few examples of plants with fibrous roots system are as follows:
Rice plantsSugarcane plantsOnionsPinesAsparagusMaizeIn conclusion; the plants which have a fibrous root system are grasses and corns.
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Does electronegativity affect replacement reactions
Elecetronegativity will affect the replacement reactions as it attracts the bonded electrons towards itself.
What is replacement reaction?Replacement reactions are those reactions in which replacement of any one element from any compound is done by any other element.
Electronegativity is the attracting power of any element to hold the bonded electron towards itself so that they will bear a partial negative charge on itself. If in any reaction replacement of anion is required and any compound have more electronegative element which bounded the bonded electron strictly and will not allow the formation of anion then it affects the activity of the reaction.
Hence electronegativity affect the replacement reactions.
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hello people ~
A proton donor is a chemical that
a) protongenic
b) protophilic
c) amphoteric
d) amphiprotic
Answer:
Amphiprotic
Explanation:
These chemicals are too independentThey can either donate or accept a lone pair of protons .So they can act as base and acidWhich of the following statements about minerals and ores is true?
Answer:
please give a photo I can't now to help u
Answer:
they have a crystalline structure is the correct answer <3
Explanation:
_____is the rate of change of displacement
Answer:
Velocity
Explanation:
The rate of change of displacement is velocity.
Answer:
Velocity
Explanation:
The rate of change of displacement with time is called velocity.
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Determine the ka of the weak acid ha whose conjugate base has kb 2. 9 × 10−8
Answer: [tex]3.45*10^{-7}[/tex]
Explanation:
we can use the equation Ka * Kb = Kw
Kw is the equilibrium constant and always equals to [tex]1*10^{-14}[/tex]
we plug the given numbers into the equation, [tex]Ka * (2.9*10^{-8} )=(1*10^{-14} )[/tex]
now we just solve for Ka, [tex]Ka=\frac{1*10^{-14} }{2.9*10^{-8} }[/tex]
which gives us the value, [tex]Ka=3.45*10^{-7}[/tex]
hope this helped! ♡
The ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.
What is ka value?Ka value is the equilibrium constant found by the dissociation of acid.
By the equation
[tex]\rm ka \times kb = kw[/tex]
where kb = [tex]2.9 \times 10^-^8[/tex]
kw = [tex]1 \times 10^-^4[/tex]
Now, putting the values in the equation
[tex]1 \times 10^-^1^4 = ka \times 2.9 \times 10^-^8\\\\ka = \dfrac{1 \times 10^-^1^4}{2.9 \times 10^-^8} \\\\ka = 3.45 \times 10^-^7[/tex]
Thus, the ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.
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Distinguish between the law of conservation of mass and the law of constant proportion
Help me describe air pollution and its causes.
Here is a Answer to your question:
Air pollution is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes and wildfires. The solid and liquid particles suspended in our air are called aerosols.
Here are the 8 causes of air pollution?
1: The Burning of Fossil Fuels
2: Industrial Emission
3: Indoor Air Pollution
4: Wildfires
5: Microbial Decaying Process
6: Transportation
7: Open Burning of Garbage Waste
8: Construction and Demolition
I am sorry if this was not helpful
Hope this was helpful
Definition of Tissue:
Answer:
any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products
Explanation:
Does this help you?
Given the following equation: Cu + 2 AgNO3 ---> Cu(NO3)2 + 2
Ag How many grams of Cu are needed to react with 262g moles of
AgNO3?
Given the following equation; Cu + 2AgNO3 = Cu(NO3)2 + 2Ag, 48.97 grams of Cu are needed to react with 262g of AgNO3.
How to calculate mass of substances?The mass of a substance can be calculated using the following steps:
Cu + 2AgNO3 = Cu(NO3)2 + 2Ag
1 mole of Cu react with 2 moles of AgNO3
Molar mass of AgNO3 = 169.87 g/molMolar mass of Cu = 63.5g/molmoles of AgNO3 = 262g/169.87g/mol = 1.54mol
1.54 moles of AgNO3 will react with 0.77 moles of Cu.
mass of Cu = 0.77 × 63.5 = 48.97g
Therefore, given the following equation; Cu + 2AgNO3 = Cu(NO3)2 + 2Ag, 48.97 grams of Cu are needed to react with 262g of AgNO3.
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When hydrogen is used in a fuel cell, the only waste product is/are __________
Answer:
water
Explanation:
The only by-products from combining hydrogen and oxygen in a fuel cell are water and heat, so hydrogen fuel cells do not emit greenhouse gases or other air pollutants as engines that use fossil fuels do.
You’re sitting at a car race and the cars sound differently when they approach as opposed to when they are moving away. Why might this be true? Explain in detail.
Answer:
I have no clue this qestion is kinda stumping but it a really good question it got me thinking but i don't know if there is a right answer
Explanation:
I don't know
60 points please help me i will appreciate it!
Answer:
[tex]\huge\boxed{\sf n = 7.36 \ mol}[/tex]
Explanation:
Given Data:
Volume = v = 42.19 L
Pressure = P = 428.792 kPa = 4.23 atm
Temperature = 27.871 °C + 273 = 300.871 K
R = the gas constant = 0.08206 L atm K⁻¹mol⁻¹
Required:
No. of moles = n = ?
Formula:
nRT = Pv
Solution:
Rearranging formula
[tex]\displaystyle n = \frac{Pv}{RT} \\\\n = \frac{(4.23)(42.19)}{(0.08206)(300.871)} \\\\n = \frac{181.467}{24.69} \\\\n = 7.36 \ mol\\\\\rule[225]{225}{2}[/tex]
How many moles of oxygen are required to burn in one mole of C4H8 completely?
Answer:
6 moles of oxygen is required to burn 1 mole of C4H8 completely
Explanation:
reaction is C4H8 + (6)O2 ------ (4)CO2+ (4)H2O
The video uses visual representations to show the generation and travel of radio waves. What did you learn about radio waves from these representations?
Answer: I learned that almost every technology has radio waves that spread out from their sources.
Explanation:
Why are xrays used to probe the crystal structure of a material
Answer:
Because X-rays have wavelengths similar to the size of atoms
X rays are used to probe the crystal structure of a material because this have same wavelength as atoms of crystal have.
What are x rays?X rays are the type of electromagnetic radiations and it is produced when the fast moving electron collide with the target anode and sudden deceleration takes place.
X rays have the high energy so that it easily penetrate in any crystal molecule as they also have same wavelength as atoms of the crystals have.
Hence due to high energy and same wavelength was of atoms of crystal it is used to probe the crystal.
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Carbon dioxide emissions have been linked to increased air pollution. The following table lists some possible public policies aimed at reducing the amount of carbon dioxide in the air
Some possible public policies aimed at reducing the amount of carbon dioxide in the air is that companies should make use of new emissions technology to avoid air pollution.
What is air pollution?What is air pollution?Air pollution is the release of substance that are dangerous or harmful to human health into the environment.
Excessive release of carbon dioxide into the atmosphere causes pollution and deplete our ozone layer.
One of the policy government have out in check is that all companies should purchase or make use of new emissions technology to avoid polluting the environment and causing harm to human health.
Therefore, some possible public policies aimed at reducing the amount of carbon dioxide in the air is that companies should make use of new emissions technology to avoid air pollution.
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Many policies are established to control air pollution like Tradable Permit System, Corrective Tax, Command-and-Control Policy, and Corrective Subsidy.
What are air pollution control policies?A corrective subsidy is a policy that encourages people to plant trees. Command-and-Control Policy or the regulation policy limits the emission of the particles that affect and harms the air and mandates the use of emissions-reducing technology.
Corrective Tax policy discourages negative effect behavior and imposes Pigovian tax that helps in achieving optimal pollutants. Tradable Permit System allows the figuring of the individual pollution emission.
Therefore, public policies are aimed to reduce air pollution through various means.
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Compare and contrastthe properties of the individual elements that combine to make salt with the compound salt
Answer:
I believe is the correct answer
Explanation:
NaCl made,2(NaCl)or2NaCl,Na2Cl,NaCl2 all represent compounds
are frosted flakes healthier than fruit loops?
No
Frosted flakes are rich in carbohydratesCarbohydrates are good for energy but they are life risky and can cause diabetes.Where as fruit loops are rich in several minerals and vitamins So fruit loops are healthierWhich of the following compounds would be expected to have the strongest ionic bonds?
the compound that has the largest ions with the greatest charge
the compound that has the largest ions with the least charge
the compound that has the smallest ions with the greatest charge
the compound that has the smallest ions with the least charge
Answer:
the compound that has the smallest ions with the greatest charge
The compound that has the smallest ions with the greatest charge will have the strongest ionic bonds. Therefore, option C is correct.
What are ionic compounds?Ionic compounds can be defined as solids formed by closely packed ions of opposite charge. An Ionic compound is commonly formed when metal combines with non-metal.
In ionic compounds, the ions are held together by ionic bonds. The ions are created by accepting or losing electrons in order to get their nearest noble gas configuration. In a reaction, the metals have a tendency to lose electrons to complete their octet while non-metals will gain electrons to fill their octet.
An ionic bond or electrovalent bond is a type of linkage generated from the electrostatic attraction between oppositely charged ions. Such a bond produces when the valence electrons of one atom are transferred permanently to another.
The more the charge on the ions and the smaller the ions stronger the ionic bond will be formed.
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the [-oh) in a sample of egg whites is 6.3 x 10-7 m. what is the [h3o+] in these
egg whites?
The hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.
How to calculate [H3O+]?The hydrogen ion concentration of a solution can be calculated as follows:
pOH = - log [OH-]
pOH = - log [6.3 × 10-⁷M]
pOH = - [-6.2]
pOH = 6.2
Since pOH + pH = 14
pH = 14 - 6.2
pH = 7.8
pH = - log [H3O+]
7.8 = - log [H3O+]
[H3O+] = 10-⁷:⁸
[H3O+] = 1.5 × 10-⁸M
Therefore, the hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.
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a total of 1.4 moles of sodium nitrate is dissolved in enough water to make 2.0 liters of an aqueous solution. the gram-formula mass of sodim notrate is 85 grams per mole. determine the molarity of the solution
Answer:
1.4 moles/ 2.0 L= 0.7 M
Explanation: Molarity= moles of solute/ Liters of solution
therefore just plug the numbers in and you'll find the molarity to equal. 0.7
Would the ph at the equivalence point be acidic, basic, or neutral for each given titration?.
The pH at equivalence point depends on the nature of the acid-base titration, and can either be acidic, basic, or neutral.
What is equivalence point?The equivalence point in a titration is the point at which equal amount of acid and base have reacted with each other.
The pH at equivalence point depends on the nature of the acids and bases being titrated.
pH at equivalence point will be:
neutral in a strong acid and strong base titrationacidic in a strong acid and weak base titration basic in a weak acid and strong base titrationTherefore, the pH at equivalence point depends on the nature of the acid-base titration.
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Which statement describes the BEST example of animals avoiding competition?
A.
A bee pollinates a flower.
B.
Cheetahs and lions feed on the same prey.
C.
A bird finds a spot in a tree to put a nest.
D.
A family of deer leave a crowded area of forest.
Answer:
D
Explanation:
If the deer leave the forest then they are avoiding compotation
What is the role of meteorites in the formation of life?
Answer:
Meteorites are consensually considered to be involved in the origin of life on this Planet for several functions and at different levels: (i) as providers of impact energy during their passage through the atmosphere; (ii) as agents of geodynamics, intended both as starters of the Earth’s tectonics and as activators of local hydrothermal systems upon their fall; (iii) as sources of organic materials, at varying levels of limited complexity; and (iv) as catalysts.
Explanation:
what are the advantages and diadvantages of preparing a standard solution?
Answer:
advantages:
. The error due to weighing the solute can be minimised by using concentrated stock solution that requires large quantities of solute. 2. We can prepare working standards of different concentrations by diluting the stock solution which is more efficient since consistency is maintained
3. Some of the concentrated solutions are more stable and are less likely to support microbial growth than working standards used in the experiments.
how many elements are in c17h19no3
Answer:
Morphine contains total 40 atom(s); 19 Hydrogen atom(s), 17 Carbon atom(s), 1 Nitrogen atom(s) and 3 Oxygen atom(s).
Explanation: