Answers
Dichotomous keys for the above can be:
Organism has legs only.... Organism has both legs and wings?They possess an antenna....do not possess an antennaDo they possess, claws?....Absence of claws?Do they have toxins( presence of stingers).... absence of stingers?How to create a dichotomous key?A dichotomous key is a tool used to identify species of plants, animals, or other objects based on a series of choices between pairs of contrasting characters.
To create a dichotomous key, follow these steps:
Familiarize yourself with the objects or organisms you wish to identify. Study their features and differences in detail.Choose the most important distinguishing characters of the objects or organisms and write down each pair of contrasting characters.Create the first split by choosing the most important contrasting character and writing it down as the first choice in the key.For each choice in the key, write down the possible outcomes and the next pair of contrasting characters.Continue making choices and creating new pairs of contrasting characters until you have identified all the objects or organisms.Learn more on dichotomous key here: https://brainly.com/question/24807939
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Related Questions
If 99.7632 g of boiling water are added at a temperature of 100.79°C. how much heat (in J) will have been released to the solution in the calorimeter when the solution reaches equilibrium at 64.4°C? (5 sf) (Hint: I'm asking you to calculate qhot for this exothermic process).
Answers
The reaction is exothermic and the heat that is released is exothermic reaction.
What is the heat that is released?We have to note that we can say that the reaction is an exothermic reaction when there is the release of heat in the system and then we know that the release of the heat would determine the equilibrium temperature.
We know that;
H = mcdT
m = mass of the water
c = Heat capacity of the water
dT = temperature change
We then have that;
H = 99.7632 * 4.2 * (64.4 - 100.79)
H = -15.2 kJ
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NEED HELP WITH CHEMISTRY ASAP
Answers
Answer:
Below
Explanation:
a) From the equation every 2 moles of (CuNo3)2 results in ONE mole of O2
starting with 5 moles you would get 2 1/2 moles of O2
each mole of O2 weighs ( 2 * 15.99) = 31.98 g ( from periodic table)
2 1/2 of these would weigh 79.95 g
b) each mole of Cu(NO3)2 produces the same number of moles of Cu O
how many moles of Cu (NO3)2 are in 87.49 g
again from periodic table Cu = 63.546 gm N = 14.007 O=15.999
total mole weight of Cu(No3)2 would then be 187.554 g
87.49 g / 187.554 g / mole = .466 moles the same amount of Cu O
c) Want to try this one yourself?
HELPPP PLEASEEEEE!!!!!!!
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The evidence in figure 2 and table 1 which describes the changes in the rock after a year is the presence of a round edge.
What is Weathering?This is referred to as the breaking down or dissolving of rocks and minerals on Earths surface through elements such as wind, water etc.
In the diagram given, the rock previously had a sharp edge but as time went on there was breakdown of the edges which resulted in it becoming round and is therefore the evidence that weathering most likely occurred in the rock.
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A particular frost-free refrigerator uses about 795 kWh of electrical energy per year. Express this amount of energy in J, kJ , and Cal.
Answers
The amount of energy used by the refrigerator is given in J, kJ, and Cal as follows:
In J = 2.862 * 10⁹ JIn kJ = 2.862 * 10⁶ KJIn cal = 6.86 * 10⁸ calWhat is the conversion factor from kilowatt-hour (kWh) to Joules (J)?The conversion factor from kilowatt-hours to joules is given below:
1 kWh = 1000 * 3600 J
1 kWh = 3600000 J
The energy used by the frost-free refrigerator is given below as follows:
795 kWh = 795 * 3600000 J
795 kWh = 2.862 * 10⁹ J
795 kWh = 2.862 * 10⁹ J / 1k/J
795 kWh = 2.862 * 10⁶ KJ
1 Joule = 0.24 Cal
2.862 * 10⁹ J = 2.862 * 10⁹ J * 0.24 cal/J
2.862 * 10⁹ J = 6.86 * 10⁸ cal
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Balsa wood has a typical density of 140kg/m^3 . What is the volume of a piece of balsa wood weighing 50lbs?
Answers
The volume of the balsa wood weighing 50lbs is approximately 0.162 cubic meters.
What is volume?Volume is defined as the space occupied within the boundaries of an object in three-dimensional space.
To find the volume of a piece of balsa wood weighing 50lbs, we need to first convert the weight to kilograms and then divide by the density of balsa wood.
1 lb = 0.45359237 kg
So, 50 lbs = 50 * 0.45359237 = 22.6796185 kg
The volume of the balsa wood can then be calculated as follows:
Volume = 22.6796185 kg / (140 kg/m^3) = 0.162 m^3
Therefore, The volume of the balsa wood weighing 50lbs is approximately 0.162 cubic meters.
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A sample of trifluoroacetic acid, C2HF3O2, contains 47.3 g of oxygen. Calculate the mass of the trifluoroacetic acid sample.
Answers
Based on the percentage mass of oxygen in trifluoroacetic acid, the mass of the trifluoroacetic acid sample is 168.5 grams.
What is the percentage mass of oxygen in trifluoroacetic acid?The percentage mass of oxygen in trifluoroacetic acid is determined as follows:
The molar mass of trifluoroacetic acid = 12 * 2 + 1 + 19 * 3 + 16 * 2
The molar mass of trifluoroacetic acid = 114 g
The percentage mass of oxygen in trifluoroacetic acid = (16 * 2)/114 * 100%
The percentage mass of oxygen in trifluoroacetic acid = 28.07%
The mass of the trifluoroacetic acid sample will be 47.3/ 28.07% = 168.5 grams
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Gaseous iodine pentafluoride, IF₅, can be prepared by the reaction of solid iodine and gaseous fluorine: I₂(s) + 5F₂(g) → 2IF₅(g) A 10.00 L flask is charged with 15.0 grams of I₂ and 2.00 atm of F₂ at 25 °C. The flask is heated to 100 °C until one of the reagents is completely consumed. What will be the percentage of IF₅ (by mole) in the final product mixture? (Assume ideal gas behavior).
Answers
Answer:
The percentage of IF₅ (by mole) in the final product mixture will be 50%. This is determined by the stoichiometry of the reaction, the given molar mass of the reactants, and the ideal gas law.
Explanation:
what volume of water should be added to 150cm3 of 0.5M NaOH to produce 0.1M solution
Answers
Taking into account the definition of dilution, the volume of water added to 150cm³ of 0.5 M NaOH to produce 0.1 M solution is 600 cm³.
Definition of dilutionA dilution is a procedure whose purpose is to decrease the amount of solute per unit volume of dilution. This procedure is accomplished by adding a specified amount of diluent to a specified amount of solute.
The amount of solute does not change. As more solvent is added, the concentration of the solute decreases and the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where:
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeVolume of water addedIn this case, you know:
Ci= 0.50 MVi= 150 cm³Cf= 0.10 MVf= ?Replacing in the definition of dilution:
0.50 M× 150 cm³= 0.10 M× Vf
Solving:
(0.50 M× 150 cm³)÷ 0.10 M= Vf
750 cm³= Vf
If the initial volume is 150 cm³, the amount of volume of water added is calculated as:
Volume of water= Vf - Vi
Volume of water= 750 cm³ - 150 cm³
Volume of water= 600 cm³
In summary, the volume of water added is 600 cm³.
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HELP PLEASEEE!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answers
Answer:
weathering
Explanation:
This is typical erosion of rocks / soil etc caused by wind/rain/ice etc
5.6 mol N₂O.
Express your answer using two significant figures.
Answers
5.6 mol N₂O is equal to 5.6 mol. (Note: The chemical formula N₂O already specifies the number of moles, so including "mol" after the number is redundant.) The answer, rounded to two significant figures, is 5.6 mol.
What is 1 Mole?A mole is a unit of measurement in chemistry that represents an amount of a substance. One mole is defined as the amount of a substance that contains Avogadro's number of entities, where Avogadro's number is defined as 6.02214076 x 10²³ particles. This number is used to convert between mass, number of particles, and moles of a substance.
For example, one mole of a pure substance contains 6.022 x 10²³atoms, molecules, or ions, depending on the nature of the substance. The mole is a useful way to measure large amounts of chemical substances while avoiding the use of cumbersome numbers.
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118Sn 117.90 47.%
119Sn 118.90 53.%
Use these measurements to complete the entry for tin in the Periodic Table that would be used on 98765 ALEKS. Round your entry for the atomic mass to 3 significant digits.
___
Sn
___
Answers
The average atomic mass of tin is 118.
What is the relative atomic mass of tin?The average atomic mass of an element can be calculated by taking into account the isotopic composition of the element and the atomic masses of its isotopes. The average atomic mass is found by weighting the atomic masses of each isotope with its relative abundance, and then summing these values.
Average atomic mass = (mass of isotope 1 * abundance of isotope 1) + (mass of isotope 2 * abundance of isotope 2) + ... + (mass of isotope n * abundance of isotope n)
For the average atomic mas of tin;
(117.9 * 0.47) + (118.9 * 0.53) =
55.4 + 63.0
= 118.4
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A 76.00 pound flask of mercury costs $142.00. The density of mercury is 13.534 g/cm3. Find the price of one cubic inch of mercury by calculating intermediate values. What is the price of one pound of mercury?
Answers
The cost of 1 pound flask of mercury is $1.86. One of the most commonly used units for determining the mass or substance of an item or a body is the pound.
What is pound?You really must understand what pounds signify when referring to weight. One of the most commonly used units for determining the mass or substance of an item or a body is the pound.
Scales are used in several ways to determine a body's weight or mass. To measure various items of various sizes, many sorts of scales are utilized. As the measure of an object's weight, pounds are used. In Britain, this style of measuring in pounds is typical.
cost of 76.00 pound flask of mercury =$142.00
cost of 1 pound flask of mercury=$142.00/ 76.00 =$1.86
Therefore, the cost of 1 pound flask of mercury is $1.86.
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A reaction has a rate constant of 0.0017/s at 400.0 K and 0.689/s at 450.0 K.
a. Determine the activation barrier for the reaction.
b. What is the value of the rate constant at 425 K?
Answers
The molecules mix more slowly in a low-rate reaction than they do in an elevated reaction. Therefore, the activation barrier for the reaction is 122 kJ.
What is rate of reaction?The change in concentration of each of the products or reactants each unit of time is referred to as the rate of reaction. The pace that a chemical reaction takes place is known as the reaction rate. The molecules mix more slowly in a low-rate reaction than they do in an elevated reaction.
log(k[tex]_2[/tex] / k[tex]_1[/tex])=(-Ea/R)×(1/T[tex]_1[/tex]-1/T[tex]_2[/tex])
Where,
k[tex]_1[/tex] = 0.0117 s-1
k[tex]_2[/tex]= 0.689 s-1
T[tex]_1[/tex] = 400.0 k
T[tex]_2[/tex] = 450.0 k
R is the ideal gas constant
R = 8.314 KJ / (Kmol * K)
Substituting all the given values, we get
ln (0.0117/0.689)=-Ea/(8.314)*((1/400)-(1/450))
Ea = 122 kJ
Therefore, the activation barrier for the reaction is 122 kJ.
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What are some hazards to be aware of in this lab?
flammable substances
sharps (equipment that can cut or puncture skin)
natural gas
electricity
fire
extreme cold
distilled (aka de-ionized or DI) water
acid
Answers
Some of the hazards that we should be aware of in the laboratory include the following: flammable substances, sharps (equipment that can cut or puncture skin) and fire. That is option A, B and E.
What are laboratory hazards?Laboratory hazards are those substances or equipments that are found in the laboratory which can cause harm to an individuals working in the laboratory.
Some of the hazards in the laboratory include chemical, biological, physical and radioactive hazards, as well as, musculoskeletal stresses.
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Some of the hazards to be aware of in this lab include;
flammable substancessharps (equipment that can cut or puncture skin)fireacidWhat are the hazards in a laboratory?A Laboratory hazard is anything that has the potential to cause damage or harm.
Chemical, biological, physical, radioactive, and other possible risks are all present for those working in a laboratory, in addition to musculoskeletal strains. Many employees are more likely to sustain injuries because they are not aware of the dangers that could exist at work.
Some laboratory hazards include:
PoisoningFire HazardsSharp ObjectsStovesLearn more about laboratory hazards at: https://brainly.com/question/30369561
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The amount of energy required to change 20g of water to steam is +150 KJ/mol. Calculate the standard heat of vaporization of water.
Answers
The amount of energy required to change 20g of water to steam is +150 KJ/mol. The standard heat of vaporization of water is 7.5 KJ/mol.
What is heat of vaporization ?The amount of energy required to convert a liquid to a vapour at constant temperature and pressure is known as latent heat. The heat of fusion is the energy required to convert a solid to a liquid, and the heat of sublimation is the energy required to convert a solid to a gas.
Given:
q = 150 KJ/mol.
m = 20gram
The standard heat of vaporization of water is calculated by given formula
Hv = q / m
Where,
Hv is heat of vaporization of water
q is heat energy
m is mass
By substituting given value in equation we get,
Hv = 150 / 20
= 7.5 KJ/mol
Thus, the standard heat of vaporization of water is 7.5 KJ/mol.
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Explain the relationships between mass % of sugar and density
Answers
The mass percent of the sugar would increase as the density is increasing.
What is the relationships between mass % of sugar and density?There is a positive relationship between the mass percent of sugar and the density of a sugar solution. As the mass percent of sugar in a solution increases, the density of the solution also increases
. This occurs because sugar molecules have mass, and when more sugar is added to a solution, the total mass of the solution increases, resulting in a higher density. However, it is important to note that the relationship between the mass percent of sugar and density is not linear and is influenced by the temperature and pressure of the solution.
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More molecules in a fixed volume means
pressure.
less
more
Answers
More molecules in a fixed volume means more pressure.
What is a Molecule?According to the context, the term may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms held together by attractive forces known as chemical bonds.
Hence, it can be seen that an increase in the number of gas molecules, while container volume stays constant, increases pressure.
A decrease in container volume increases gas pressure. An increase in the temperature of a gas in a rigid container increases the pressure
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which of the following cannot be a chemical symbol of an element
Answers
Cf cannot be a chemical symbol of an element. Therefore, option B is correct.
What is an element ?The term an element is defined as a substance that cannot be broken down into a simpler format. They are separate by a unequaled atomic number. The elements are formed by their atomic number in the periodic table, which highlights elements with similar properties.
Cf cannot be a chemical symbol of an element. CO is the symbol of element cobalt. B is the symbol of element boron and Cu is the symbol of an element copper.
Thus, option B is correct.
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Your question is incomplete, most probably your answer was
Which of the following cannot be the chemical symbol for an element
a. co
b. cf
c. b
d. cu
3. Record your observations for each simulation test trial in the tables below and write 3-4 sentences describing your observations.
(Hint: Simulation is in lesson 1.16)
Choose a different starting number of carnivores, herbivores, and producers for each trial you conduct.
Table 1: Test Trial 1
Organisms in Simulation Start (number you added of each) End (number you ended with)
Carnivore
Herbivore
Producer
Table 2: Test Trial 2
Organisms in Simulation Start (number you added of each) End (number you ended with)
Carnivore
Herbivore
Producer
Table 3: Test Trial 3
Organisms in Simulation Start (number you added of each) End (number you ended with)
Carnivore
Herbivore
Producer
Write 3-4 sentences describing your observations in the three tables above.
4. What conclusions can you draw about how resource availability affects populations of organisms in an ecosystem? Write an evidence-based claim. (Hint: This means you state whether your hypothesis/prediction is correct or incorrect. You then need to provide evidence from your observation tables to support your claim of it being correct/incorrect.)
Answers
The abundance of resources means that there would be more individuals in the ecosystem.
What is the effect of availability of resources on the ecosystem?When resources are abundant, competition for those resources is less intense. However, when resources become scarce, competition for them increases, and some species may become extinct or be displaced by more competitive species.
Again, availability of resources can also affect population growth. For example, if resources are abundant, populations of organisms may increase, leading to overcrowding and competition for limited resources. On the other hand, if resources are scarce, population growth may be limited.
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chemical name of this formula Na2SO4.
Answers
Na is for sodium and SO4 is sulfate...
Answer: The chemical compound name for Na₂SO₄ is Sodium Sulfate.
HElppppppp!!!!!!!!!!!!!!!!!!!!!!!
Answers
Answer:
The edges changes quite drastically and the size went down by a millimeter. The color and hardness didn't change at all. The most noticeable difference was the edges.
Pls answer the question OR ELSE... You will step in a huge pile of gum, thereby ruining your shoes!
This is what you call a reactant that you have enough of. The one that DOES NOT run out.
Question 2 options:
Excess Reactant
Limiting Reactant
Answers
Answer:
Excess Reactant
Explanation:
Limiting Reactant is the reactant the runs out first.
Calculate the velocity of these electrons. The mass of an electron is equal to 9.10938 × 10e–31 kg, the speed of light (c) is equal to 3.00 × 10e8 m/s, and Planck's constant is h = 6.626 × 10e–34 J•s.
Answers
The mass of an electron is equal to 9.10938 × 10e–31 kg, the speed of light (c) is equal to 3.00 × 10e8 m/s, and Planck's constant is h = 6.626 × 10e–34. The velocity of these electrons is 297,196,680.87m/s
What is velocity ?The term velocity is defined as the direction of the movement of the body or the object. Speed is primarily a scalar quantity. Velocity is essentially a vector quantity.
We know the equation connecting potential and velocity of electrons is as follows,
eV=12mv2
Where eV is the kinetic energy
Also, we know
According to Einstein equation and de broglie equation we can write
mc2=hc
So,
mc = h
Given
me = 9.10938 × 10e
c = 3.00 × 10e8 m/s
h = 6.626 × 10e–34
λ = h / mc
= 2.45 × 20 ⁻¹²m
λ = h / mv
v = 297,196,680.87m/s
Thus, the velocity of these electrons is 297,196,680.87m/s
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4. Which formula represents the binary molecular compound dinitrogen tetroxide?
O N₂0
ON₂04
O NO4
O N₂02
Answers
N₂0₄ is the formula represents the binary molecular compound dinitrogen tetroxide. Therefore, option B is correct.
What is the binary molecular compound ?Binary molecular compounds are made up of exactly two nonmetal elements. HF, NO2, and P2O5 are a few examples. It is extremely simple to name binary molecular compounds. The first element is given its element name, followed by ide; the second element is given its root (hydr, bor, carb, ox, fluor, etc.).
In N₂0₄ molecule there are two nitrogen atoms at the suffix so, it is binary and in oxygen atom its suffix is 4 so, it is tetroxide. Therefore, N₂0₄ is the formula represents the binary molecular compound dinitrogen tetroxide.
Thus, option B is correct.
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The pressure of a gas sample at 37.0 °C is increased from 1.10 atm to 2.30 atm by heating at a constant volume. What is the temperature (in °C) of the gas at 2.30 atm?
Answers
Considering the Gay Lussac's Law, the the temperature of the gas at 2.30 atm is 375.18 °C.
Definition of Gay Lussac's LawGay Lussac's Law establishes the relationship between the pressure and temperature of a gas when the volume is constant.
This law establishes that the pressure of the gas is directly proportional to its temperature because as the temperature increases the gas molecules move faster and therefore the number of collisions against the walls increases. In other words, the pressure increases since the container has fixed walls.
Mathematically, Gay Lussac's Law says that the ratio between pressure and temperature is constant:
P÷T=k
where
P is the pressure.T is the temperature.k is a constant.Analyzing an initial state 1 and a final state 2, it is fulfilled:
P₁÷T₁=P₂÷T₂
Temperature at 2.30 atmIn this case, you know:
P₁= 1.10 atmT₁= 37 °C= 310 K (being 0°C= 273 K)P₂= 2.30 atm T₂= ?Replacing in Gay Lussac's law:
1.10 atm÷ 310 K= 2.30 atm÷T₂
Solving:
(1.10 atm÷ 310 K)×T₂= 2.30 atm
T₂= 2.30 atm÷ (1.10 atm÷ 310 K)
T₂= 648.18 K= 375.18 °C
Finally, the final temperature is 375.18 °C.
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How do I draw the Lewis structure ?
Answers
Find out how many valence electrons there are in total. Step 2: Write down the molecule's skeleton structure. Step 3: Each bond in the skeleton structure is formed by using two valence electrons.
How should I depict the Lewis structure?First, the sum of the valencies of each atom determines the total number of valence electrons in the molecule.
The Lewis dot structure gains electrons (number of electrons added equals magnitude of negative charge) if the molecule is an anion.
A Lewis electron dot diagram, also known as an electron dot diagram, Lewis diagram, or Lewis structure, is a way to show the valence electrons in an atom by placing dots around the symbol for the element. The number of valence electrons in the atom is depicted by the diagram's number of dots. The atom symbol is surrounded by dots that represent the electrons in the outer shell. These symbols are referred to as Lewis symbols and electron dot symbols.
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What are the molecular weights of the following compounds? 1. MgCl₂ 2. (NH4)SO4
Answers
The molar mass of compound of magnesium chloride is 95.211 g/mole while that of ammonium sulfate is 132.14 g/mole.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
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