How has the discovery of DNA affected the classification of protists?
Answers
With the discovery of DNA and the development of molecular techniques for analyzing genetic material, scientists were able to analyze the genetic makeup of different protist species and use this information to classify them in a more accurate and meaningful way. By comparing the DNA sequences of different protist species, scientists were able to determine which species were closely related and which were more distantly related. This led to the development of new classification systems that were based on evolutionary relationships rather than just physical characteristics.
Overall, the discovery of DNA has greatly enhanced our understanding of protist evolution and has allowed for more accurate and meaningful classification of these organisms. It has also led to the discovery of many new protist species and the reclassification of previously known species into new taxonomic groups.
Related Questions
according to orwell, what does president truman say about the atomic bomb?
Answers
According to Orwell president Truman says that the bomb is incredibly expensive, and only three or four countries in the world are able to produce it due to the massive industrial effort required.
Truman said that the only factor in his decision to drop the bomb was the military. It is believed that a Normandy-style amphibious landing would have resulted in one million fatalities. Truman thought the bombs also helped save Japanese lives. The President had no intention of extending the conflict. American lives had already been lost as a result of more than 3,500 Japanese kamikaze raids. But he didn't anticipated the effect of bomb on human's.
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Where would you see Polaris if you were at the equator?
Answers
Answer:
At the equator, Polaris would appear to sit right on the horizon. So if you travel to the north, the North Star climbs progressively higher the farther north you go.
If this is correct can i get Brainliest
Answer:
on the north horizon
Explanation:
hope this helps :)
when you need to carry chemicals from one place to another in the lab, what size container is the safest to use
Answers
When transporting chemicals in the lab, it is important to use a container that is appropriate for the volume and properties of the chemical being transported. In general, smaller containers are safer because they are easier to handle and less likely to spill or break.
For liquid chemicals, it is best to use a container that is only partially filled, leaving some space for expansion due to temperature changes or other factors. Glass or plastic bottles with tight-fitting caps or stoppers are often used for liquids. For solid chemicals, a sealed plastic or glass container is appropriate, with enough space to prevent the contents from being damaged during transport. It is important to follow all safety procedures and guidelines for handling, storing, and transporting chemicals, including wearing appropriate personal protective equipment and labeling all containers clearly.
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Calculate the molar mass of a gas with a mass of 3.15 g, a pressure of 785 mmHg, and a temperature of 20 Celsius. The gas has a volume of 750 ml.
Answers
Answer:
Molar mass = 105 g/mol
Explanation:
Given data:
Mass of gas = 3.15 g
Pressure = 785 mmHg
Temperature = 20°C
Volume of gas = 750 mL
Molar mass of gas = ?
Solution:
Pressure = 785 mmHg (785/760 = 1 atm)
Temperature = 20°C (20+273 = 293 K)
Volume of gas = 750 mL (750 mL× 1 L/1000 mL = 0.75 L)
PV = nRT
R = general gas constant (0.0821 atm.L/mol.K)
1 atm× 0.75 L = n×0.0821 atm.L/mol.K × 293 K)
0.75 atm.L = n× 24.06 atm.L/mol
n = 0.75 atm.L / 24.06 atm.L/mol
n = 0.03 mol
Molar mass of gas:
Molar mass = Mass / number of moles
Molar mass = 3.15 g/ 0.03 mol
Molar mass = 105 g/mol
H2SO4 + 2 NaOH →
Na2SO4 + 2 H20
What mass of H2SO4 would be required to react with 2.25 mol of NaOH?
Answers
Answer:
110.25grams
Explanation:
The balanced chemical equation is as follows:
H2SO4 + 2NaOH → Na2SO4 + 2H20
Based on the balanced chemical equation of the reaction given above, 1 mole of sulphuric acid (H2SO4) is required to react with 2 moles of sodium hydroxide (NaOH).
Hence, if 1 mol of H2SO4 is needed to react with 2 moles of NaOH
Then, 2.25mol of NaOH will be required to react with;
= 2.25/2
= 1.125mol of H2SO4
Using the formula, mole = mass/molar mass, we can convert the molar value of H2SO4 to its mass value.
Molar mass of H2SO4 = 1(2) + 32 + 16(4)
= 2 + 32 + 64
= 34 + 64
= 98g/mol
Therefore, mole = mass/molar mass
1.125 = mass/98
mass = 98 × 1.125
mass = 110.25grams of H2SO4
in this short synthetic sequence, provide the organic structures of the missing reactant and the missing product.
Answers
The first step of the reaction, we have reaction between a nucleophile and an electrophile.
We can see that in the first step of the reaction, we have reaction between a nucleophile and an electrophile. In this case, the electrophile would have to be an alkyl halide which produces a carbocation as show in the image attached. What we have here is quite similar or like most of the organic reactions, this reaction occurs in a number of detailed or smaller steps and each step of the reaction is going to help to bring us closer to the end product of the entire steps of the reaction which is wat we target as we carry out the particular reaction.The second step involves the reduction of the alkyne with the use of a Lindlar catalyst. As such the reaction is poisoned and it stops at the alkyne stage rather than going on to obtain the alkane.
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The magnesium reacts with the hydrochloric acid to produce a gas and a salt.
Answers
Answer:
General equation = acid +metal---->salt+ hydrogen
word equation =hydrochlooric acid + magnesium ---> magnesium chloride + hydrogen gas.
Explanation:
I hope this is what you want.
Answer:
The magnesium reacts with the acid, producing visible bubbles of hydrogen gas. ... Magnesium ribbon is a flammable solid. Hydrochloric acid is a corrosive liquid. Hydrogen gas is explosive.
Summary: Magnesium, mossy zinc and copper foil are reacted with hydrochloric acid to produce hydrogen gas and a salt. The reaction rates are compared. Hazards: Hydrochloric acid is corrosive and toxic.
what other configuration information does it provide? name two.
Answers
An IP address provides information about the network location and host ID.
An IP address is a numerical label assigned to each device connected to the internet or a local network. It is used to identify and locate devices on the network so that data can be transmitted between them.
In addition to providing information about the network location and host ID, an IP address also provides information about the network class and the subnet mask.
The network class of an IP address can be determined based on its first few bits. The different classes of IP addresses (A, B, C, D, and E) are used to define different ranges of IP addresses and are used to route data on the internet.
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For the reaction below, if 6.3 g of S reacted with 10.0 g of O₂, how many grams of SO3 will be produced?
2S (s) + 30₂(g) → 2S03 (g)
Answers
2S + 302 = 2SO3
Mass of S = 6.3g
Mass of 02 = 10.0g
n = m/MM(S) = 32g/mol
n = 6.3g/32g/mol
n = 0.195mol
n(S)/n(SO3) = 2/2
Let n(SO3) = x
2(0.195) = 2x
0.39 = 2x
x = 0.195
Therefore, n(SO3) = 0.195mol
For mass of SO3m = M×nBut M(SO3) = (32×1) + (16×3)
= 80g/mol
m = 80g/mol × 0.195mol
m = 15.6g
Therefore, 15.6g of SO3 will be produced. HOPE IT HELPS. HAVE A WONDERFUL DAY.
How
fast does hydrogen break down in the atmosphere? 1 year 10 years
?
Answers
Hydrogen breaks down relatively fast in the atmosphere. In the presence of sunlight, hydrogen breaks down within a few years. However, in the absence of sunlight, it can take up to a decade (10 years) for hydrogen to break down in the atmosphere.
Hydrogen is the first element in the periodic table with the symbol H. It is the most abundant element in the universe, but it is rarely found in its elemental form on Earth. It is often found combined with other elements such as oxygen and carbon. Hydrogen is a colorless, odorless, and highly flammable gas. It is used in a variety of applications, such as fuel for vehicles, electricity production, and chemical manufacturing.
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what is the real gas pressure exerted by 1.00 mol of o2 at 300. k in 2.41 l if the ideal pressure is 10.0 atm?
Answers
the real gas pressure for above question was 91.4atm
what is van der waals equatio?
The Van der Waals equation (or Van der Waals equation of state) is an equation of state used in chemistry and thermodynamics that extends the ideal gas law to take into account the effects of interactions between molecules in a gas as well as accounting for the finite size of the molecules.
The ideal gas law views gas molecules as point particles that interact only with their surroundings and not with one another, which means that when they collide, they do not occupy any space or change their kinetic energy.
The volume V occupied by n moles of any gas has a pressure P at a temperature T determined by the following relationship, according to the ideal gas law, where R is the gas constant:
PV=nRT
(pxn2a/v2) (v-nb)=nRt
p 10x1.36/2.41x2.41-10x0.0318
p 13.6/2.41x2.092
nRt=p2.69
10x0.08206x300/2.69
=91.4atm
therefore the real gas pressure =91.4atm
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Sandra claims that invisible fairies live above the clouds where no one can see, hear or feel them. Which of the
following is true?
Sandra's claim is a hypothesis that she could test with the scientific method.
B
Sandra's claim is not scientific because it is not testable,
с
Sandra's claim is a law based on empirical evidence.
D
Sandra's claim is not scientific because no one famous would agree with her.
Answers
Answer: D
Explanation: It's not scientific. branlist plz
What is the normal boiling point of of a solution containing 64.5g of non volatile quinoline ( MW 129 ) in 500 g of benzene when the normal boiling point is 80.10 and KB = 2.50
Answers
Answer:
THE NORMAL BOILING POINT OF A SOLUTION CONTAINING 64.5 g OF QUINOLINE IN 500 g OF BENZENE IS 82.6 C
Explanation:
Boiling point = old boiling point + molarity * boiling point constant (Kb)
First, you calculate the number of moles of quinoline in the solution
number of moles = mass / molar mass
Since the molar mass of quinoline has been given as 129 g/mol
number of moles = 64.5 g / 129 g/mol
number of moles = 0.5 moles.
Next is to determine the molarity:
molarity = number of moles of solute / kilogram of solvent
molarity = 0.5 moles / 500/1000 kg
molarity = 0.5 / 0.5
molarity = 1 M
The new boiling point can then be calculated using the formula:
B. P = old B.P + Kb * molarity
B.P = 80.10 + 2.50 * 1
B.P = 80.10 + 2.50
B.P = 82.6 degree celsius
Select the correct answer. Study the image, and then choose the statement that best describes the image. A. Abiotic factors influence only certain species of organisms. B. Survival of all species of organisms depends greatly on abiotic factors. C. Only biotic factors dictate the survival of plant and animal life. D. The predators’ survival depends on biotic factors
Answers
Biotic factors are living components of an ecosystem that directly or indirectly affect the survival and behavior of organisms.
These factors include plants, animals, fungi, bacteria, and other microorganisms. Biotic interactions can have a profound impact on the population dynamics, species diversity, and overall functioning of an ecosystem.
Biotic factors play a crucial role in shaping the structure of ecosytems. For example, the presence of predators can control the populatsion size of prey species, leading to a balance in the ecosystem. Similarly, the interactions between pollinators and flowering plants are essential for the reproduction and survival of both parties.
Biotic factors can also influence the distribution and adaptations of organisms. For instance, certain plants may have specific symbiotic relationships with bacteria or fungi in their roots, aiding in nutrient absorption. Competition for resources, such as food, water, and shelter, among different species can also shape their distribution patterns.
Overall, biotic factors are integral to the functioning and sustainability of ecosystems. They interact with abiotic factors to create a complex web of relationships that determine the survival, growth, and evolution of organisms within their environments
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What happens to the number pf protons in an atom as you move across a period.
The number of protons increase
The number of protons stay the same The number of protons decrease
Answers
Answer:
A. The number of protons increase.
Explanation:
Each element rank is determined by the number of protons.
Hydrogen is #1 with 1 proton, Helium is #2 with 2 protons, Lithium is #3 with 3 protons, and so on.
cr2o72- which element is reduced in the reaction represented above, and how does its oxidation number change?
Answers
The oxidation number of chromium is +6. In the reaction, it is reduced, meaning its oxidation number decreases. The final oxidation number of chromium is +3.
In the reaction represented by the Cr₂O₇²⁻ ion, the element chromium (Cr) is reduced. Its oxidation number changes from +6 to +3.
In the Cr₂O₇²⁻ ion, each oxygen (O) atom has an oxidation number of -2. The overall charge of the ion is 2-, which means the total oxidation numbers of all the atoms should add up to -2. Since there are seven oxygen atoms, their total oxidation number is (-2) × 7 = -14.
To determine the oxidation number of chromium (Cr), we can set up the following equation;
2(Cr) + 7(-2) = -2
Simplifying the equation, we have;
2Cr - 14 = -2
By solving for Cr, we get;
2Cr = 12
Cr = 6
Initially, the oxidation number of chromium is +6. In the reaction, it is reduced, meaning its oxidation number decreases. The final oxidation number of chromium is +3.
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Which of the following students best describes an element?
Answers
Answer:
I dont see anything.
Explanation:
But an element is a substance that is made only out of one atom.
An electron has a ______ electrical charge.
Answers
Answer:
Negative
Explanation:
Electron is a subatomic particle with a negative charge of -1e unlike the proton which has a positive charge of +1e
In an atom, an electron has a net negative charge revolving in orbits around the nucleus.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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how can you blance it and make it equal on both sides
2H2+o2=2H2o blance it
Answers
Answer:
it have been already balanced
2H2 + O2 = 2H2O.
"Many of the transition metals (orange) can have more than one charge. The notable exceptions are zinc (always +2), silver (always +1) and cadmium (always +2). "
If some have set/constant ionic charges do they need roman numerals?
and my follow up question,
is it always necessary to use the Roman numeral as the assigned charge of the transition metal?(if so, why? why? do roman numeral need to be added to silver etc. If they already have set charges?)
Answers
If a transition metal has a set/constant ionic charge, it is not necessary to use Roman numerals to indicate its charge. The use of Roman numerals is to indicate the variable ionic charge of a transition metal, which can have multiple possible charges depending on the particular compound.
For example, silver is always +1 in ionic compounds, so there is no need to use a Roman numeral to indicate its charge. Similarly, zinc is always +2, and cadmium is always +2, so there is no need for Roman numerals in these cases.
However, for transition metals that have variable ionic charges, Roman numerals are necessary to indicate the charge. This is because the charge of the transition metal in a particular compound cannot be determined just from the name of the compound.
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HELP ASAP PLEASE WILL GIVE 12 points
A. Which of the following reaction mixtures will produce
hydrogen more quickly at room temperature:
(i) zinc granules + dilute nitric acid?
(ii) zinc powder + dilute nitric acid?
B. Give an explanation of your answer to a.
C. Suggest two other methods by which the speed of
this reaction can be altered.
Answers
Answer:
zinc powder + dilute nitric acid
Decrease the temperature in Exothermic reactions (Reactions that release energy, or become hot) Add a catalyst (A substance that reduces activation energy, speeding up the reaction) Increase the concentration of reactants. Increase the concentration of catalysts
Explanation:
Brainliest?
liquid homogeneous mixture
Answers
Answer:
Liquid Homogeneous Mixture ExamplesWater - another example of homogeneous mixture; all but the purest water contains dissolved minerals and gases; These are dissolved throughout the water, so the mixture presents in the same phase and is homogeneous.Explanation:
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these are the examples of homogeneous mixture
When a phosphate is transferred from ATP it can?
Answers
Energy is released and ATP is changed into adenosine diphosphate when one phosphate group is eliminated by dissolving a phosphoanhydride bond during a procedure known as hydrolysis (ADP).
Phosphorus can supply energy for cell activities when it is moved from ATP (adenosine triphosphate). It's not unexpected to allude to ATP as the "sub-atomic cash" of energy trade in cells, and the exchange of an ATP phosphate gathering to another particle can deliver energy that can be used to drive metabolic exercises or different cycles.
The association between two of the phosphates in ATP is broken in a cycle known as hydrolysis, which discharges energy and changes the particle of ATP into ADP (adenosine diphosphate).
The energy produced by this response can thusly be utilized by cell cycles to drive various organic tasks.
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what is the empirical formula of a compound that consists of 0.039 moles of iron atoms combined with 0.052 moles of oxygen atoms?
Answers
Fe3O4
Hope this helps :))
The empirical formula of a compound that consists of 0.039 moles of iron atoms combined with 0.052 moles of oxygen atoms is FeO\(\rmFeO_{2}\).
What is empirical formula?The simplest whole number ratio of atoms in a compound is the empirical formula of a chemical compound in chemistry. Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula are two straightforward examples of this idea.
The simplest whole number ratio of each type of atom in a compound is its empirical formula. It can be determined from data on the mass of each component in a compound or from the composition's proportion.
calculation:
Fe = 56/0.039 = 150
O = 16/0.052 = 300
in simplest term ratio is 1:2
Thus, empirical formula is FeO\(\rmFeO_{2}\).
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What are the Oxidation numbers for H2AsO4-
Answers
i cant understand your question define briefly
PLEASE HELP DUE IN 20 MINUTES Find the empirical formula for the following problem. Remember to show your work if you want
to earn credit.
1. One mole of an unknown compound has 36.0 g of carbon and 6.0 g of hydrogen. What
is the empirical formula of the unknown compound? (Hint: You will want to reduce to find
the empirical formula)
Given: Carbon: 36.0 grams
1 mol C = 12.0 g
Hydrogen: 6.0 g
1 mol H = 1.0 g
Unknown: empirical formula
Solve:
Answers
Answer:
CH2
Explanation:
The empirical formula is the simplest formula of a chemical compound. It shows the ratio in which constituent atoms are combined in the compound.
To obtain the empirical formula, we divide the given mass of each element by the relative atomic mass of that element.
C- 36.0 g/12.0 g H- 6.0g/1.0g
C- 3 H-6
Divide through by the lowest ratio;
C-3/3 H- 6/3
C-1 H-2
Hence the empirical formula of the compound is
CH2
I need the definition of Friction, choose one! Thank you
Answers
Answer:
the force resisting motion. it slows things down
2 03(g) → 3 0₂(8) AH=-285 kJ/mol,
The bond enthalpy of the oxygen-oxygen bond in O, is 498 kJ/mol. Based on the enthalpy of the reaction represented above, what is the average bond enthalpy, in kJ/mol, of an oxygen-oxygen bond in 03?
Please help meee
Answers
The enthalpy of formation of ozone is 142.7 kJ / mol. The bond energy of O2 is 498 kJ / mol.
What is the oxygen oxygen bond’s bond enthalpy?498 kJ/mol
The bond energy of molecular oxygen, O2, is 498 kJ/mol and is photolyzed by light of 241 nm. HOOH, which has an extremely weak O-O bond, is photolyzed by light at 845 nm. Alternatively, the usual enthalpy of production of oxygen is zero because diatomic oxygen in its gaseous phase is the most stable form compared to mono-atomic oxygen (O) and triatomic oxygen (O3).
The elements that will react to generate H2O are present in their elemental forms. Because it takes no energy to generate a naturally occurring compound, the enthalpy of formation for an element in its elemental state will always be 0.
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hydrated CoCl2 is a deep purple color. After being heated for a long time, it turns into its anhydrous form, which is sky blue. Is this a chemical or physical change
Answers
Answer:
Physical change
Explanation:
It is a physical change because a physical change involves alteration in physical properties or appearance in color, sizes e.t.c but no new substances is formed. From the question, CoCl2 undergo a physical change because it's physical property which is color changed , its composition is not altered or no new substances is formed during the reaction.
Identify the Bronsted acids and bases in the following equation (multiple choice)
Answers
Reactions according to Bronsted are those in which there is an exchange of H+ ions. The Bronsted acid will be the substance that donates H+ ions and the base will be the compound that receives them.
As a result we will have a conjugated acid and a conjugated base. The conjugate acid will be the former base that just received the H+ ions. The conjugate base will be the former acid that donated its H+ ions.
Now let's look at the reaction. On the reactants side the compound that can donate H+ ions will be HSO3- and the compound CN- will be the one that receives them. Therefore, HSO3 will be the Bronsted acid (A) and CN will be the base (B).
HSO3 ---> A
CN -----> B
Now let's look at the product side. The compound that received the H+ ions will be the compound HCN, so this will be the conjugate acid (Ac). And the compound that lost its H+ ions is SO3, so it will be the conjugate base (Bc).
HCN --->Ac
SO3 ---->Bc
Comparing the analysis that we did with the reaction we will have that:
\(\begin{gathered} HS_{}O^-_3+CN^-\rightleftarrows HCN+SO^{2-}_3 \\ A+B\rightleftarrows Ac+Bc \end{gathered}\)So, the answer will be option number 5