Answer:
Some worms are nocturnal and some a diurnal
Explanation:
Variation is difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences (genotypic variation) or by the effect of environmental factors on the expression of the genetic potentials (phenotypic variation).
NOTE:these are of the same species.
Which of these is a learned behavior of a dog?
1.Begging for food
2.Drinking water
3.Panting on a hot day
4.Chewing on a bone
describe the three main concepts that make up cell theory
Explanation:
1.All living organisms are composed of one or more cells
2. The cell is the basic unit of structure and organisation in organisms
3.Cells arise from pre-existing cells
The half life of potassium 40 is approximately 1.25 billion years. An igneous rock is found to contain about 1/4 of its original mass of potassium 40. The approximate age of the rock is _____ billion years.
Answer:
2.5 billion years
Explanation:
WILL MARK BRAINLEST
Use this image of a greenhouse to help explain how the Earth gets heated through the greenhouse effect.
Answer/Explanation:
The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases.
Earth's surface warms up in the sunlight. At night, Earth's surface cools, releasing heat back into the air. But some of the heat is trapped by the greenhouse gases in the atmosphere. That's what keeps our Earth a warm and cozy 58 degrees Fahrenheit (14 degrees Celsius), on average.
Which properties are characteristic of true solutions? (Select all that apply.)
The light beam is unaffected.
The particles are larger than 10 -8 cm.
The particles are dissolved.
The particles are suspended indefinitely.
Answer:
The correct answers are
Particles are dissolved
and light beam passes through invisibility
Explanation:
Odyssey
Determine the ions of ammonium, in 870.4x10-23 grams of (NH4)3PO4. Round the results to the tenths.
Answer: if your trying to say what 4x10-23 is the answer is 17
and if ur also trying to say whats 870.4x10-23 the answer is 8681 have a nice day!
Explanation:
also and what is (NH4)3PO4 if its a file code or link your not allowed to post that
Consider the table below that summarizes the types of materials that can block the 3 different types of radiation. Based on the table, at which numbered spot in the table does each type of radiation belong. 1 = beta; 2 = alpha, 3 = gamma
Answer:
D. 1 = gamma; 2 = alpha, 3 = beta
Explanation:
I apologize if this answer is late, but I got answered the question right on my "Types of Radioactive Decay" quiz :)
Hope this is helpful for others! :D
Based on the table, the type of radiation belong from 1 is the gamma rays, from 2 is the aplha rays and from 3 is the beta rays.
What are radiations?During the radioactive decay process, some amount of energy is released in the form of particles and that radiations will known as alpha rays, beta rays and gamma rays.
Gamma ray are mare energetic rays and will shielded by only lead and thick concrete materials.Beta rays are less energetic than gamma rays and will shielded by lead, cloth, paper, wood, aluminium foil and thick concrete materials.Aplha rays have very less amount of energy in it and it will be shielded by all above mention materials.Hence 1 is the gamma rays, 2 is the aplha rays and 3 is the beta rays.
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What reaction would you expect chromium to have with water
Answer: It does not react with water, but reacts with most acids. It combines with oxygen at room temperature to form chromium oxide. Chromium oxide forms a thin layer on the surface of the metal, protecting it from further corrosion (rusting).
Explanation:
What is an action citizens can take to prevent energy waste?
Answer:
Turning the lights off when they're not needed.
How can the strength of an acid be determined using titration? (100 POINTS!)
Answer:
Explanation:
A titration in general is used to determine the concentration of something with a solution of known solution. For acid, a base solution of known concentration is added slowly. The end-point is determined by using a pH indicator. When the acid is neutralized at the end, note the amount of base solution used and the strength of acid can be calculated.
Note that the quantity of base solution utilised and the acid strength can be estimated after the acid has been neutralised.
What is titration?Titration is a method of chemical analysis where the quantity of a sample's constituents is established by adding a precisely measured amount of something else with which the component that is wanted will react in a specific, known proportion.
A burette, which is essentially a long, graded measurement tube with a stopper and a tube for injection at its bottom end, is used to gradually administer a standard solution of titrating reagent, and titrant, to a specified concentration. When the point of equal value is achieved, the addition is terminated. Note that the quantity of base solution utilised and the acid strength can be estimated after the acid has been neutralised.
Therefore, note that the quantity of base solution utilised and the acid strength can be estimated after the acid has been neutralised.
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How many formula units are in 2.0 moles of Fe(NO3)2?
Answer:
1.2 x 10>24 (2.0)(6.022 x 10>23)
Explanation:
How many formula units are in 2.0 moles of Fe(NO3)2?
Mole measure the number of elementary entities of a given substance that are present in a given sample. 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is inversely proportional to molar mass.
Mathematically,
Mole of Fe(NO₃)₂. =given number of atoms of Fe(NO₃)₂.÷ 6.022×10²³(Avogadro number)
mole of Fe(NO₃)₂= 2moles
Substituting the values
2=number of atoms of Fe(NO₃)₂.÷ 6.022×10²³
Number of atoms of Fe(NO₃)₂.=2×6.022×10²³
Number of atoms of Fe(NO₃)₂.=12.044×10²³
Therefore, 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.
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A building is found to be losing heat to the outside during the winter months. Which would be the best solution to correct this design problem?
increase amount of heating
increase surface area of walls
increase number of windows
increase thickness of insulation
no link or I will report
Answer:
increase thickness of insulation
Explanation:
don't increase amount of heating because that's difficult and not efficient.
don't increase surface area of walls because that makes heat be lost quicker.
don't increase windows because windows lose heat worse than walls.
increase thickness of insulation because it's the most effiecient and effective method of keeping heat.
PLEASE HELP!! 10 POINTS!
what could the fourth quantum number of a 2s^2 electron be?
Answer:
D. ms=+1/2.
Explanation:
Hello there!
In this case, since the quantum numbers are known as:
* Principal quantum number (n) which cannot be zero. The allowed values of n are therefore 1, 2, 3, 4, and so on.
* Angular quantum number (l) is able to be any integer between 0 and n-1. If n = 2, for example, l can be either 0 or 1.
* Magnetic quantum number (m) is able to be any integer between -l and +l. If l = 3, m can be either -3, -2, -1, 0, +1, +2 or +3.
* Spin Quantum Number (ms): ms = +½ or -½. Accounts for the orientation of the spin axis of an electron as it is able to spin in only one of two directions.
Thus, since the fourth quantum number is ms, spin, we infer that the answer is D. ms=+1/2 because it represents the positive spin on 2s^2.
Best regards!
Answer: ms = +1/2
Explanation: a pex
PLZ HELP!
Where have you seen or known of examples of waves in your life? Based on science terms of a wave.
Answer:
I answered this in your recent post of this question.
Explanation:
Hope that this helps you out! :)
If you have any questions please put them in the comment section below this answer.
Have a great rest of your day/night!
Please thank me on my profile if this answer has helped you.
When balancing chemical equations, it is okay to adjust
(3 points)
A.
coefficients.
B.
superscripts.
C.
subscripts.
D.
any of these.
Answer:
A
Explanation:
Thats the correct anwers
some plz help me make mnemonic to helpme remember the oder of the planets
Answer:
My - Mercury
Very- Venus
Excited- Earth
Mother- Mars
Just- Jupiter
Served- Saturn
Us- Uranus
Nachos- Neptune
Explanation:
Mark me Brainliest?
Answer:
My very encouraging made just us nachos
Explanation:
My stands for Mercury
Very stands for venus
Encouraging- Earth
made- Mars
just- Jupiter
Us- Uranus
Nachos- Neptune
During a tug-of-war, the rope accelerates towards the left. What is true about the forces acting on the rope?
Explanation:
Forces are given many names, such as push, pull, thrust, lift, weight, friction, and tension. Traditionally, forces have been grouped into several categories and given names relating to their source, how they are transmitted, or their effects. The most important of these categories are discussed in this section, together with some interesting applications. Further examples of forces are discussed later in this text.
Materials that allow electrons to move easily from atom to atom are called _____________.
Answer:
Explanation:
conductors
Predict what happens when tin metal is placed into
a solution of nickel(II) iodide.
A. Tin(II) iodide forms
B. Tin metal dissolves
C. Nothing
D. Both a and b happen
E. Nickel is plated onto tin
Answer:
I would say A but I'm not sure
When tin metal is placed into a solution of nickel (II) iodide then nothing will occur.
What is reactivity series?Reactivity series of the metals tells about the increasing or decreasing orders of the reactivity of the metals.
According to the reactivity series, reactivity of nickel metal is more than the tin metal. So, if we add tin metal in the solution of nickel (II) iodide then no reaction occurs. Because the reactivity of tin is less as compare to nickel metal so it is not possible for tin to replace the nickel metal and get dissolve.
Hence, option (C) is correct i.e. nothing.
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if the solution is acidic, which ion is found in greater concentration?
Answer:
An acidic solution has a high concentration of hydrogen ions (H +start superscript, plus, end superscript), greater than that of pure water.
The acidic solution indicates the highest concentration of hydrogen or the proton ion in the solution.
What is acidity?Acidity is the measure of the hydrogen ion in the solution by the pH scale and gives the acidic or basic characteristics to the solution.
The concentration of the hydronium or the hydroxide in the solution is a way to determine the acidic basic nature and the pH and pOH of the solution.
Therefore, in an acidic solution hydrogen ions are in the greatest concentration.
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Image attached 50 points!
You know the number of moles of Mg that react: 6 moles.
You don't know (yet) how many moles of Mg₃N₂ are produced when 6 moles of Mg react.
The coefficients of each substance in the chemical equation tells us the molar ratio between the substances. The coefficient of Mg is 3, and the coefficient of Mg₃N₂ is 1 (coefficients of 1 are implied and omitted). So, for every 3 moles of Mg that react, 1 mole of Mg₃N₂ is produced.
We can use the proportion set up in the image to calculate the number of moles of Mg₃N₂ produced. In the first fraction, the green-boxed numerator should be our known number of moles of Mg, that is, 6 moles Mg. In the second fraction, we insert our molar ratio. Since we want the product of these two fractions to have the units "moles Mg₃N₂," the numerator in the second fraction should be 1 mole Mg₃N₂ and the denominator should be 3 moles Mg.
Our setup should look like this:
[tex]\frac{\textrm{6 moles Mg}}{1} \times \frac{\textrm{1 mole }\mathrm{Mg_3N_2}}{{\textrm{3 moles Mg}}} = \textrm{2 moles }\mathrm{Mg_3N_2}.[/tex]
Indeed, 2 moles of Mg₃N₂ are produced.
Answer:
2 moles of Mg₃N₂ are produced.
Explanation:
Why do we not use molecular formulae for polymers?
Answer:
Polymers are long chain molecules that occur naturally in living things and can also be made by chemical processes in industry. Plastics are polymers, so polymers can be extremely useful.
Explanation:
Can someone help me ❤️❤️❤️
Answer:
i think the answer would be C
Explanation:
no matter what you do to the jar the mass will stay the same. unless you add more nails
In your own words, describe the difference between Thermal Energy and Heat.
Answer:
Heat is the flow of thermal energy between two objects of different temperature whereas the thermal energy tells about how much is the transfer of energy due to temperature difference between two bodies. Hence thermal energy in transit gives heat
1.The symbol of an atom changes when the number of _______
changes.
2.The net charge of an atom depends on ___________ and
_________.
3.The atom is neutral when ________ and _________ are equal.
4.The mass number of an atom depends on __________ and
_________.
Answer:
1. proton
2. electrons and protons
3. protons and electrons
4. protons and neutrons
Explanation:
Calcium Carbonate decomposes at 1200°C to form carbon dioxide and
calcium oxide. If 25 L of carbon dioxide are collected at 1200°C, what will
the volume of this gas be after it cools to 25°C?
This is a Charles' Law problem: V1/T1 = V2/T2. As the temperature of a fixed mass of gas decreases at a constant pressure, the volume of the gas should also decrease proportionally.
To use Charles' Law, the temperature must be in Kelvin (x °C = x + 273.15 K). We want to solve Charles' Law for V2, which we can obtain by rearranging the equation into V2 = V1T2/T1. Given V1 = 25 L, T1 = 1200 °C (1473.15 K), and T2 = 25 °C (298.15 K):
V2 = (25 L)(298.15 K)/(1473.15 K) = 5.1 L.
The volume of this gas will be "5.1 L".
Given:
[tex]V_1 = 25 \ L[/tex][tex]T_1 = (1200+ 273 )K[/tex][tex]= 1473 \ K[/tex]
[tex]T_2 = (25+ 273)K[/tex][tex]= 298 \ K[/tex]
As we know,
→ [tex]\frac{V_1}{V_2} = \frac{T_1}{T_2}[/tex]
By substituting the values, we get
→ [tex]\frac{25 \ L}{V_2} = \frac{1473 \ K}{293 \ K}[/tex]
→ [tex]V_2 = \frac{25\times 298}{1473} \ L[/tex]
→ [tex]= 5.1 \ L[/tex]
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Please answer the question for BRAINLIEST
Answer:
The Drip, The Gucci, The Swag, and The OG
Explanation:
PLEASE HELP
The theory of plate tectonics is supported by evidence that crustal plates move relative to each other. How does this observation support the theory of plate tectonics?
It suggests that plates are dragged around by ocean currents.
It suggests that plates are dragged around by air currents.
It suggests that plates can move independently of one another.
It suggests that plates cannot move independently of one another.
Answer:
non independantly
Explanation:
If 21.6 g of NO and 13.8 g of O₂ are used to form NO₂, how many moles of excess reactant will be left over? 2 NO (g) + O₂ (g) → 2 NO₂ (g)
Answer: 0.071 moles of excess reactant [tex](O_2)[/tex] will be left over.
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
a) moles of [tex]NO[/tex]
[tex]\text{Number of moles}=\frac{21.6g}{30.01g/mol}=0.720moles[/tex]
b) moles of [tex]O_2[/tex]
[tex]\text{Number of moles}=\frac{13.8g}{32g/mol}=0.431moles[/tex]
[tex]2NO(g)+O_2(g)\rightarrow 2NO_2(g)[/tex]
According to stoichiometry :
2 moles of [tex]NO[/tex] require 1 mole of [tex]O_2[/tex]
Thus 0.720 moles of [tex]NO[/tex] require=[tex]\frac{1}{2}\times 0.720=0.360moles[/tex] of [tex]O_2[/tex]
Thus [tex]NO[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess regaent.
moles of [tex]O_2[/tex] left = (0.431-0.360) = 0.071 moles
Scientists create models for all of the following reasons, EXCEPT
A - because a model can represent objects too large to comprehend
B - because a model can help to communicate their ideas
C - because a model is the only way to conduct an experiment
D - because a model is the only way to represent objects too small to see