Quick summary:
Homeostasis describes an environment that supports the survival of cells. It is achieved by making sure the temperature, pH (acidity), and oxygen levels (and many other factors) are set just right. All of your body's systems work together to maintain homeostasis inside your body.
key sentences:
-Homeostasis is a term that is used to both describe the survival of organisms in an ecosystem and to describe the successful survival of cells inside of an organism.
-Organisms and populations of organisms can maintain homeostasis in an environment when they have a steady level of births and deaths.
-It is similar to the idea of equilibrium.
-All of your body's systems work together maintain homeostasis inside of your body.
-Homeostasis is achieved by making sure the temperature, pH (acidity), and oxygen levels (and many other factors) are set just right for your cells to survive.
Summary paraphrased a bit: (Might not 100% make sense grammatically, but it can be a decent guide)
Homeostasis describes an environment which promotes cell survival. It is done by ensuring that the levels of temperature , pH (acidity), and oxygen (and several other variables) are set just right. To maintain homeostasis within your body, all of your body's systems work together.
Select the lewis structure for xeo2f2 which correctly minimizes formal charges.
Answer:
explanation and image attached
Explanation:
Our aim is to draw a structure of XeO2F2 whith the least formal charges. We must remember that the compound has 34 valence electrons.
To obtain the least formal charges then Xe must have a total of twelve electrons on its valence shell instead of eight.
The other atoms around the central Xe atom are arranged as shown in the image attached.
Image Credit: UCLA
The correct Lewis structure allows all the atoms involved in the bond to have eight electrons in the valence layer.
You can see this structure in the image attached below.
We can arrive at this answer because:
According to the Lewis structure, atoms must achieve electronic stability, by getting eight electrons in the valence layer.Therefore, covalent bonds are very important, as it allows atoms to share electrons, so that they achieve stability.Within the Lewis structure, each little ball around the atom symbol represents an electron in the valence layer and each trace represents the sharing of one more electron.In this case, we can observe the figure below and count the number of electrons that each atom reaches with the covalent bond between them. This will show us that each has eight electrons, which is the correct structure for [tex]X_eO_2F_2[/tex].
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How do the elements in each group differ? How are they similar?
Explanation:
All the elements in one group have the same number of valence electrons. The valence electrons are those on the energy level the most distant from the nucleus. These valence electrons are those involved in bonding with other atoms to form compounds.
In the periodic table elements in the same group posses similar physical and chemical property and this is due to the similarity in the number of valence electrons found in their valence shells.
While in the periodic table as we move down a group the atomic number of the elements will continue to increase because elements in the same group are located in different periods as well.
Hence we can conclude that the difference in the elements located in a group is that they have different atomic numbers while the similarities is that the posses the same number of valence electrons.
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Why is sublimation such a critical component for the water cycle in cold climates?
Answer:
Sublimation is a critical component for the water cycle in cold climates where water in the solid form or ice is prevalent because sublimation which is the transformation of a solid substance to a liquid without passing through the liquid phase including when ice transforms directly into vapors, readily takes place when the relative humidity is low and the wind is dry, which are conditions that can be found combined mainly in cold climates
Explanation:
12. What is a metal on the periodic table? What is a nonmetal? (Relative to the
metalloid staircase)
Answer:Metals are left of the Metalloid stair case and non metals are right
Explanation:
Pick any metal on the periodic table (left of the staircase). Aluminum, Calcium, Lead, anything but Hydrogen.
Non-metals are found on the right side of the staircase. Chorine, Iodine, Carbon, etc
**Keep in mind that not all solids are metalloids.
How many molecules are there in 5H20?
A.5
B.7
C.10
D.11
I really need help with this ASAP
Answer:
1) Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.
2) By collecting the hydrogen gas that is produced over water or in a syringe, rate graphs can be produced. The volume of gas produced and the time taken need to be recorded. The rate of the same reaction could be monitored by measuring the change in the mass of reactants as they react to form products.
Which of these molecules has an overall dipole moment? O A. F2 B. H2S C. CH4 D. CO2
The molecules that have an overall dipole moment are H₂S. The correct option is B.
What is a dipole moment?A dipole moment is created when the charges are separated. There are two types of dipole: one is an electric dipole, which separates the negative and positive charge of an electromagnetic system.
Dipole moment is caused between ions when there is ionic bond and between atoms when there is a covalent bond. The dipole moment is formed when there is a difference in electronegativity.
The more the electronegativity, the dipole moment increases. The dipole moment of H₂S is 0.95 D. The electronegativity between hydrogen and sulfur is very high, therefore its dipole moment is also than others.
Thus, the correct option is C, H₂S.
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What’s the definition of renewable energy
Answer:
energy from a source that is not depleted when used, such as wind or solar power.
Explanation:
Explanation:
renewable energy is energy from a source that is not depleted when used such as wind or solar power.
Hope this helps :)
What two gases are produced during the electrolysis of water?
Answer:
hydrogen and oxygen.
Explanation:
How does the mass of an oxygen nucleus
compare to the mass of the 8 protons and
8 neutrons that make up the nucleus?
Answer: The mass of the nucleus is less than the mass of the 8 protons and 8 neutrons.
Explanation:
How is light produced in an atom?
Answer:
light is the result of electrons moving between defined energy levels in an atom called shells.
Explanation:
when something exited an atom like collision with another atom or a chemical reaction, an electron may absorb energy boosting it to a higher level shell.
Which is the more energetic, a red photon or a blue photon? Explain in terms of frequency and wavelength.
Answer:
Shorter waves vibrate at higher frequencies and have higher energies. Red light has a frequency of around 430 terahertz, while blue's frequency is closer to 750 terahertz. Red photons of light carry about 1.8 electron volts (eV) of energy, while each blue photon transmits about 3.1 eV.
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How many molecules of N2O5 are there in 175 grams of N2O5?
Answer:
9.76 x 10²³molecules
Explanation:
Given parameters:
Mass of N₂O₅ = 175gram
Unknown:
Number of molecules = ?
Solution:
To find the number of molecules contained in the given mass, we need to find the number of moles of N₂O₅ first.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of N₂O₅ = 2(14) + 5(16) = 108g/mol
Number of moles = [tex]\frac{175}{108}[/tex] = 1.62moles
Now;
1 mole of a substance = 6.02 x 10²³ molecules
1.62 mole of N₂O₅ = 1.62 x 6.02 x 10²³ = 9.76 x 10²³molecules
Which of these is the correct Lewis dot structure for LiCl.
In animals. energy is produced by the:
A. endoplasmic reticulum
B. nucleus
C. mitochondria
D. chloroplast
A mole is blank objects
Answer:
Well what I found was that this was this answer
Explanation:
A mole is 6.022 x 1023 objects of any kind - atoms, electrons, molecules, cars, people, etc... . It is known as Avogadro's number after the scientist who discovered ... Blah blah I think you get it.
A student uses visible spectrophotometry to determine the concentration of CoCl2(aq) in a sample solution. First the student prepares a set of CoCl2(aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.
The original solution used to make the solutions for the standard curve was prepared by dissolving 2.60g of CoCl2 (molar mass 130.g/mol) in enough water to make 100.mL of solution. What is the molar concentration of the solution?
A) 0.200 mol
B) 0.500 mol
C) 1.00 mol
D) 5.00 mol
Answer:
A
Explanation:
2.60 g of CoCl2 was dissolved in water to make 100 mL of solution.
Number of moles of CoCl2 dissolved = mass/molar mass
= 2.60/130
= 0.02 mole
Molar concentration of solutions = number of moles/volume (dm3)
= 0.02/0.1
= 0.200 M
Hence, the molar concentration of thesolution is 0.200 molar.
Correct option = A
A student prepared a solution used to make the solutions for the standard curve by dissolving 2.60g of CoCl₂ (molar mass 130. g/mol) in enough water to make 100. mL of solution. The molar concentration of the solution is 2.00 M.
First, we will convert 2.60 g to moles of CoCl₂ using its molar mass (130. g/mol) as the conversion factor.
[tex]2.60 g \times \frac{1mol}{130. g} = 0.0200 mol[/tex]
0.0200 moles of CoCl₂ are in 100. mL (0.100 L) of solution. The molar concentration of the solution is:
[tex]M = \frac{0.200 mol}{0.100 L} = 2.00 M[/tex]
A student prepared a solution used to make the solutions for the standard curve by dissolving 2.60g of CoCl₂ (molar mass 130. g/mol) in enough water to make 100. mL of solution. The molar concentration of the solution is 2.00 M.
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is Sc2S3 polar or non polar or ionic
Answer: Ionic
Explanation:
Which Group 2A element would you expect to be the most reactive?
beryllium (Be)
calcium (Ca)
barium (Ba)
radium (Ra)
Answer:
Calcium
Explanation:
It has the largest atom
Glycerine is known as a negative catalyst.why?
Answer:
The presence of 1-2% ethanol as catalyst, suppresses the oxidation of chloroform with oxygen to give a poisonous gas called phosgene. ... Here glycerol acts as negative catalyst. Criteria or characteristics of catalysts. i. The mass and chemical composition of catalyst should remain unchanged at the end of the reaction.
Explanation:
PLEASE HELP!!!!!
What role do chemical processes play in the operation of the flashlight?
2) In a calorimetry experiment, 70.0 g of a substance was heated to
270.00 degrees Celsius and then placed in 3500.0 g of water. The water
bath's starting temperature was 15.00 degrees Celsius. If the substance's
listed specific heat is 0.890 J/gC, predict the temperature at thermal
equilibrium. *
onlar
The temperature at thermal equilibrium : 16.1 °C
Further explanationQ absorbed = Q released
Heat can be formulated :
Q = m.c.Δt
c= specific heat, J/g°C
Δt = temperature different, C°
m= mass, g
Q water=Q substance
[tex]\tt 3500\times 4.18\times (t_2-15)=70\times 0.89\times (270-t_2)\\\\14630(t_2-15)=62.3(270-t_2)\\\\14630t_2-219450=16821-62.3t_2\\\\14692.3t_2=236271\\\\t_2=16.1^oC[/tex]
What type of energy does a ball have when it rolls down a hill?
А
kinetic energy
B
light energy
magnetic energy
D
nuclear energy
N2 + 3H2 Right arrow. 2NH3 What is the percent yield of NH3 if the reaction of 26.3 g of H2 produces 79.0 g of NH3? Use Percent yield equals StartFraction actual yield over theoretical yield EndFraction times 100..
Answer:
53.4%
Explanation:
N₂ + 3H₂ → 2NH₃
Given that:
26.3 g of H₂ react with N₂ to produce 79.0 g of NH₃
Then:
The number of moles of H₂ = 26.3g of H₂ * (1 mol of H₂/ 2.02g of H₂)
= 13.05 mol of H₂
The number of moles of NH₃ = 13.05 mol of H₂ * ( 2mol of NH₃/ 3 mol of H₂)
= 8.697 mol of NH₃
The mass of NH₃ = 8.697 mol of NH₃ *( 17.04g of NH₃/ 1 mol of NH₃) = 148.1 g of NH₃
The percent yield = actual yield/ theoretical yield * 100%
The percent yield = ( 79.0 g/ 148.1 g )* 100%
The percent yield ≅ 53.4 %
Answer:
53.4
Explanation:
When an object such a a stone is dropped into water, it disturbs the surface of the water. Waves form at the surface of the water and travel outward from the point of the disturbance.
The diagram below is based on a single frame from a video of the waves that formed when a stone was dropped into water.
If a student were to measure the distance labeled as "Z," she would know the value of the _______ of the wave.
A.
radius
B.
amplitude
C.
frequency
D.
wavelength
Answer: sorry i’m late but the answer is D- wavelength :)
Explanation:
54. Copper(I) sulfide is formed when copper and sulfur are
heated together. In this reaction, 127 g of copper reacts
with 41 g of sulfur. After the reaction is complete, 9 g of
sulfur remains unreacted. What is the mass of copper
sulfide formed?
SEL
Ma
Answer:
159g
Explanation:
Copper (I) sulfide is formed by the chemical reaction between copper and sulfur. Copper is a limiting reagent that results in the formation of 190.26 grams of copper(I) sulfide.
What is a limiting reagent?A limiting reagent is defined as the reactant that gets completely utilized in the reaction and affects the amount of the product formation. On the contrary, the excess reagent is present in more amounts.
Given,
Mass of copper = 127 gm
Mass of sulfur = 41 gm
Moles of copper:
n = mass ÷ molar mass
n = 127 ÷ 63.546
n = 1.99
Moles of sulfur:
n = 41 ÷ 32.065
n = 1.27
The reaction is shown as:
Cu + S → CuS
Here, 9 g of sulfur remains unreacted and hence is an excess reagent, and copper being consumed is a limiting reagent.
Here, 1 mole of copper reacts to form 1 mole of copper sulfide hence, 1.99 moles of Cu produces, 1.99 moles of copper sulfide.
Mass of CuS is calculated as:
Mass = moles × molar mass
Mass = 1.99 mol × 95.611 g/mol
= 190.26 grams
Therefore, 127 gm of copper and 41 gm of sulfur produces 190.26 grams of copper sulfide.
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If your cannot keep your balance, what bodily structure might be responsible?
A. Ossicles
B. Semicircular canal
C. Hippocampus
D. Occipital lobe
Answer:
d
Explanation:
What is the frequency of a particular type of electromagnetic
radiation with a wavelength of 5.00 x 10-8 m?|
Answer:
f = 0.6× 10¹⁶ Hz
Explanation:
Given data:
Wavelength of radiation = 5.00 × 10⁻⁸ m
Frequency of radiation = ?
Solution:
Formula:
Speed of light = wavelength × frequency
speed of light = 3 × 10⁸m/s
Now we will put he values in formula.
3 × 10⁸m/s = 5.00 × 10⁻⁸ m × f
f = 3 × 10⁸m/s / 5.00 × 10⁻⁸ m
f = 0.6× 10¹⁶ s⁻¹
s⁻¹ = Hz
f = 0.6× 10¹⁶ Hz
The smallest particle of an element that retains the properties of that element is a(n) ____. a. atom c. proton b. electron d. neutron
Answer: proton
Explanation:
They are what give an atom it’s identity
Name the following Compound: KCI
Answer:
Potassium Chloride
Explanation:
K = Potassium
Cl = Chlorine