Some examples of evidence that support Darwin's theories of evolution and natural selection , such as fossils and similarities between related living organisms.
Darwin employed certain sorts of evidence to support his hypothesis of natural selection, and these types of evidence are still used today. Examples include fossils and similarities between related living animals. Others, like DNA analysis, were unavailable to Darwin's generation but are now employed by scientists to further our understanding of evolution. evidence supporting evolution: fossil strata, remains of extinct organisms, similarities between current-day organisms, DNA similarities, and embryonic similarity. Artificial selection, or breeding, is a crucial sort of evidence that Darwin looked at and is being looked at and employed today.
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A word used to describe if one substance can be dissolved in another
1. aqueous
2. solvent
3. solution
4. concentration
5. solute
6. soluble
7. cohesion
8. solvation
9. polarity
10. dilution
11. adhesion
12. solubility
river system smallest to largest
As stated, the Tributary, River, and River system are in order of largest to smallest.
What is the short definition of a river?A river is a part of the ocean that resembles a ribbon and flows downward under the influence of gravity. A river may be both large and deep or it may be only shallow enough to wade over. A stream, watercourse, or brook is a streaming water source that is lower than a river.
What is a river metaphor?The river flows through the landscape like a silver ribbon. The fast flowing river plunders everything in its path. The river is a seal that is attempting to return toward the tidal ways. A grizzly bear is the river, leaping to get its prey.
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The complete question is-
Place the following in order from smallest to largest.
River, River system, Tributary.
Dalton's Law: John puts 1250 PSI of Oxygen, 780 PSI of Nitrogen and 550 PSI of Helium in a SCUBA tank. What is the total pressure?
According to Dalton law total pressure will be 2580 PSI.
What is Dalton Law?The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture, according to Dalton's partial pressures law. For instance, the total pressure exerted by a mixture of two gases A and B is equal to the sum of gas A and gas B's respective partial pressures.
Total pressure =[tex]P_{1}+P_{2}..........P_{n}........(i)[/tex]
It is given that,[tex]P_{Oxygen}= 1250 PSI, P_{Nitrogen} = 780 PSI, P_{Helium} =550PSI.[/tex]
Now, put the value of given data in above equation.
[tex]P_{Total} = P_{Oxygen}+P_{Nitrogen}+P_{Helium}[/tex]
=1250 PSI +780 PSI + 550PSI=2580 PSI
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I rlly need help with my science hwk its due in tomorrow and I am stuck can any one help me plzz :)
Answer:
Sulfur dioxide relased by the industry=
25%
Explanation:
The amount of sulfur dioxide relased by the industry can be calculated by looking at the values of the other; transport and electricity generation. Since electricity generated sulfur dioxide is 69% + 6% of transport that equals 75%. Pie diagrams always equal a total of 100%.
so simply you minus 75 from 100: 100-75=25%.
The overall charge of an atom or ion is ________ if the number of electrons is ________ than the number of protons.
The overall charge of an atom or ion is negative if the number of electrons is greater than the number of protons.
What is electron?A subatomic particle with a negative charge is called an electron. It is found outside the nucleus of an atom and is one of the main constituents of matter. Electrons are responsible for the chemical properties of atoms and thus play an important role in chemical reactions. Electrons have low mass and move around the nucleus at relativistic speeds. They are also responsible for the electrical and magnetic properties of atoms, and for the transmission of light and other forms of energy. Electrons can also interact with other particles and form complex structures, such as molecules.
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Suppose that a chemist combines 231 mL of methane and 907 mL of chlorine at STP in a 2.00 L flask. The flask is then allowed to stand at 298 K. If the reaction reaches 75.9% completion, what is the total pressure in the flask
The total pressure in the flask is 1.320 times the total pressure.
What is pressure?Pressure is an important concept in chemistry, as it affects the physical behavior of gases and solids, and the rates at which reactions occur. Pressure is a measure of the force applied to an area, typically expressed in units of atmospheres (atm), or kilopascals (kPa).
Methane :
Mole fraction of methane = (231 mL / 2.00 L) = 0.1155
Partial pressure of methane = 0.1155 * Ptotal
Chlorine:
Mole fraction of chlorine = (907 mL / 2.00 L) = 0.4535
Partial pressure of chlorine = 0.4535 * Ptotal
Products:
Mole fraction of products = (75.9% com) = 0.759
Partial pressure of products = 0.759 * Ptotal
Total pressure = 0.1155*Ptotal + 0.4535*Ptotal + 0.759*Ptotal = 1.320*Ptotal
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Part A
Determine the value of Kp for the following reaction:
4HCl(g)+O2(g)⇌2Cl2(g)+2H2O(g)
Express the equilibrium constant to three significant digits.
To determine the value of Kp for a reaction, we need to know the concentrations of all the reactants and products at equilibrium.
In this case, we are not given the equilibrium concentrations, so we cannot directly calculate Kp. Instead, we can use the ideal gas law to relate the equilibrium concentrations to the partial pressures of the gases, and use those partial pressures to calculate Kp.The equation for the ideal gas law is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. If we assume that the reaction occurs at a constant volume and a constant temperature, we can use the ideal gas law to relate the equilibrium partial pressures of the gases to the concentrations of the gases.Given that we have no information about the equilibrium concentrations or partial pressures, we can not calculate Kp.
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A 6.25 g sample of magnetite (Fe 3O 4) contains 4.52 g of Fe. What are the percentages of iron and oxygen in magnetite
We used the formula percentage of iron magnetite=(Mass of Fe/Mass of Fe3O4)100%. We then calculated the percentages of iron magnetite (68%) and oxygen magnetite (32%).
Magnetite is a mineral and one of the most important iron ores, with the chemical formula Fe2+Fe3+2O4. It is a ferrimagnetic iron oxide that is attracted to a magnet and can be magnetized to become a permanent magnet. With the exception of extremely rare native iron deposits, it is the most magnetic of all naturally occurring minerals on Earth. Naturally magnetized pieces of magnetite, known as lodestone, will attract small pieces of iron, which is how ancient peoples discovered magnetism.
Magnetite is black or brownish-black with a metallic luster, has a Mohs hardness of 5-6, and leaves a black streak. Magnetite grains are very common in igneous and metamorphic rocks.
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A vitamin contains 9.2 x 10^23 iron atoms. How many moles of iron are in the tablet?
Answer:
Approx. 20 moles of iron.
Explanation:
There are approx.
6.022
×
10
23
iron atoms per mole of ion. This quantity, this number of iron atoms has a mass of
55.85⋅g . And of course, when we quote the mass of iron we say
55.85⋅g⋅mol−1 .
Diatomic elements are important. what makes them different from other elemental substances?
Diatomic elements are different from other elemental substances because they consist of two atoms of the same element bound together.
What are Diatomic elements?
Diatomic elements are elements that generally exist as molecules composed of two atoms of the same element. The seven elements that exist as diatomic molecules are hydrogen (H2), oxygen (O2), nitrogen (N2), fluorine (F2), chlorine (Cl2), bromine (Br2), and iodine (I2).
The two atoms form a covalent bond, meaning that each atom shares its outermost electrons with the other atom. This creates a strong bond between the two atoms, making the diatomic element more stable and less reactive than other elemental substances.
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What determines whether a metamorphic rock is foliated or non foliated?
- The number of remaining gas molecules
-Temperature, pressure, and the original type of rock
-The water content as a percentage of the rock volume
The presence or absence of mineral crystals
Temperature, pressure, and the original type of rock is the correct answer i PROMISE :)
In lab, a dialysis bag was filled with a 10% sucrose solution and placed in an unlabeled beaker filled with clear liquid. The dialysis bag was made of a semipermeable membrane that allowed the free passage of water, but was not permeable to sucrose. After two hours, the bag in the beaker decreased in size, lost volume, and became flaccid. Therefore, at the beginning of the experiment, the solution in the bag was ____________ compared to the solution in the beaker. g
Answer:
Of lower concentration or less concentrated
Explanation:
Osmosis is the movement of solvent from a region of lower concentration of solute to a region of higher concentration of solute through a semipermeable membrane in order to equalize the concentration of the solutions on both sides.
Since the membrane of the bag is semipermeable, then the fact that the bag in the beaker decreased in size, lost volume, and became flaccid indicates that the solution in the bag is of lower solute concentration than the solution in the beaker hence the movement of water molecules into the beaker by osmosis.
Calculate the molarity of a solution of HNO3 if 15.72 mL of the solution neutralize 28.2 mL of 0.100 M H2SO4 solution
The molarity of a solution of HNO3 if 15.72 mL of the solution neutralize 28.2 mL of 0.100 M H2SO4 solution is 0.89 x 10^-4M
Given the volume of HNO3(V1) = 15.72mL
The volume of H2SO4 (V2) = 28.2mL
concentration of H2SO4 (M2) = 0.100M
Concentration of HNO3 = M1
We know that c = n/v where n is the number of moles.
The moles of H2SO4 (n2) = V2 X M2/1000
n2 = 28.2 x 0.100 /1000 = 28. 2 x 10^-4
From the reaction: H2SO4 + HNO3 -> NO2+ + HSO4- +H2O
We can see from the equation that the number of moles of HNO3 must be half that number, so: n1 = 28. 2 x 10^-4 /2 = 14.1 x 10^-4
M1 = 14.1 x 10^-4/15.72 = 0.89 x 10^-4M
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what is the pH of water?
Answer:
7.00
Explanation:
Pure Water is the only purely neutral substance on earth so it has a neutral pH of 7
The two elements that are frequently used for making transistors are
A. boron and aluminium
B. silicon and germanium
C. iridium and tungsten
D. niobium and columbium
The two elements that are frequently used for making transistors are niobium and columbium.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
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why atoms of chlorine have no overall charge
Answer:
because I told them to do.
Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
Calculate the molarity of the following solution: 0.50 moles of MgCl2 in 150 milliliters of solution.
Answer:
3.333M
Explanation:
Basically,
Molarity=(moles of solute)/(litres of solution)
=(0.5 moles)/(150/1000)L
=3.333M
If a sample of pure hydrogen gas is ignited very carefully, the hydrogen burns gently, combining with the oxygen gas of the air to form water vapor. Write the unbalanced chemical equation for this reaction.
H₂ (g) + O₂ (g) ⇒ H₂O (g) because Hydrogen and oxygen gas both exist as diatomic molecules. The water is in gaseous state due to the heat given off by the combustion reaction.
What is combustion reaction?Combustion, often known as burning, is a high-temperature exothermic redox chemical reaction that occurs between a fuel and an oxidant, typically atmospheric oxygen, to generate oxidized, generally gaseous products in a mixture known as smoke. A combustion reaction is a type of chemical reaction that occurs when any combustible component reacts with an oxidiser to generate an oxidised product. Fires and the release of energy in the form of heat are frequently associated with combustion processes. A hydrocarbon generally combines with oxygen in most combustion processes to produce carbon dioxide and water.
Here,
Because hydrogen and oxygen gas exist as diatomic molecules, H2 (g) + O2 (g) = H2O (g). Because of the heat produced by the combustion reaction, the water is in a gaseous condition.
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Solve these 5 items in your notebook and take a clear and readable photo. PS. You need to balance the equation before u identify the type of chemical reaction.
Answer
bitly coin download
Explanation:
bitly coin download
suppose scientist have found three oxide materials that could potentially be used as a cathode to a magnesium or sodium anode in a battery for electrons plan an investigation to determine the best battery what characteristics did you test for
The sodium is the anode of the cell while the magnesium is the cathode of the cell.
How would the investigation go?We know that in the cell, we are going to have just about two electrodes in the cell and we would have the cathode and the anode. We have to know that the cathode is the point by which the current would enter the cell and the cathode is the point from which the current would leave the cell.
Having said this, we should know that the investigation would have to take into account the reduction potentials of the magnesium as well as that of the sodium as these can be used in the construction of the cell that is under study here.
Hence, by consideration of the electrode potentials, we can see that the sodium would have to act as the anode of the cell and we would keep up with the magnesium as the cathode of the cell.
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energy transfer wet table information??
The energy is produced due to the process of beak down in the chemical process or reaction.
What is energy transfer and how can energy transfer?
That energy is stored in the bonds of the chemical compounds which include molecules and atoms. The point is released in the chemical reaction and the most power produces heat as a by-product, known as an exothermic reaction.
Energy may be released in a chemical reaction in the form of heat; that reaction is called exothermic. Reactions that require an input of heat to proceed may store some of that energy as chemical energy in newly formed bonds.
So we can conclude that Energy defined as the capacity to supply heat or do work is known as energy.
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diatomic elements are important. what makes them different from other elemental substances?
Atoms follow the octet rule, which makes them more stable in pairs.
The diatomic elements oxygen and nitrogen have a slightly more complex structure. There is a double bond between the two O atoms in the O₂ dot structure. And there is a triple bond between the two N atoms in the N₂ dot structure. Diatomic elements are elements that are never found alone in nature. It is always bound to another atom. The diatomic state of this atom is much more stable than its unbonded state.
Everything around us contains energy, even if it doesn't move. All molecules and atoms have spins and vibrations, but these are all internal forces.
All atoms try to reach the lowest potential. Atom has a state of lower energy, implying maximum stability under certain external conditions.
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The type of bonding and the number of covalent bonds an atom can form with other atoms is determined by __________
The type of bonding and the number of covalent bonds an atom can form with other atoms is determined by number of unpaired electrons.
The number of unpaired electrons in the valence shell because covalent bond is equal to a chemical bond that involves sharing a pair of electrons between atoms in a molecule. When electrons are shared among atoms, they make a bond known as a covalent bond. Because atoms are sharing one pair of electrons, this covalent bond is known as a single bond. These atoms can do the equal aspect that the H atoms did; they proportion their unpaired electrons to make a covalent bond.
Thus, the number of unpaired electrons is useful in the type of bonding and the number of covalent bonds.
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In biology, a system is a collection of (blank)
(each made of multicellular tissues) that together perform a major function.
In biology, a system is a collection of organs (each made of multicellular tissues) that together perform a major function.
What is the organ about?In biology, a system refers to a collection of organs that work together to perform a specific function or set of functions. Organs are structures made of multiple types of tissues that work together to perform a specific task.
These tasks can be related to maintaining homeostasis, such as the circulatory system which transports oxygen and nutrients throughout the body, or to a specific function, such as the reproductive system which is responsible for the production of offspring.
Therefore, Organs within a system are highly specialized and have specific functions, but they also work together in concert to achieve the overall function of the system. For example, the digestive system is made up of several organs including the mouth, esophagus, stomach, small intestine, and large intestine.
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How many grams of mercury can be produced if 18.0 g of mercury (11) oxide decomposes?
Answer:
18.0 g of mercury (11) oxide decomposes to produce 9.0 grams of mercury
Explanation:
Mercury oxide has molar mass of 216.6 g/ mol. It gas a molecular formula of HgO.
The decomposition of mercury oxide is given by the chemical equation below:
2HgO ----> 2Hg + O₂
2 moles of HgO decomposes to produce 1 mole of Hg
2 moles of HgO has a mass of 433.2 g
433.2 g of HgO produces 216.6 g of Hg
18.0 of HgO will produce 18 × 216.6/433.2 g of Hg = 9.0 g of Hg
Therefore, 18.0 g of mercury (11) oxide decomposes to produce 9.0 grams of mercury
This is really easy plz help me out 25 points
Describe the difference between an endothermic reaction and an exothermic reaction.
Answer:
In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.
Please hurry and help please don’t send a link
Answer:
A for 1 and 4 B for 2 and 3 ..........
Answer:
1)A 2)B 3)B 4)A
Explanation:
An autotroph is a producer (plant) and a heterotroph is a consumer. Good luck!
what is the mass of 7.80 moles of ammonium sulfate?
Answer: The mass is 1030.692 grams (1.03 x 10^3 grams if you apply sig figs)
This is a units conversion problem, we'll first need the molar mass of ammonium sulfate: 132.14 g/mol
Then we can solve so that:
7.80 moles (132.14 g/moles) = 1030.692 grams
PLZ HELP !!!!
Will give Brainlist
Answer:
Li, Na, K
Explanation:
They are all group 1 metals