Answer:
The model cannot show how light bends.
Explanation:
Why are nonnative species a threat to biodiversity?
A. They often use up resources that other organisms need
B. They are not able to successfully breed in the wild
C. They release pollution into many environments
D. They easily contract and spread diseases to other organisms
Answer:
A. They often use up resources that other organisms need.
Explanation:
Invasive alien species are animals, plants, fungi and microorganisms entered and established in the environment from outside of their natural habitat. T
hey reproduce rapidly, out-compete native species for food, water and space, and are one of the main causes of global biodiversity loss.
A 25.0mL solution of KOH is neutralized with 30.3 mL of 0.100M HBr. What is the concentration of the original KOH solution?
Answer:
The concentration of the original KOH solution is 0.1212 M.
Explanation:
Dilution is the process to reduce the concentration of solute in solution. This is accomplished by adding more solvent to the same amount of solute. In other words, dilution is the procedure followed to prepare a less concentrated solution from a more concentrated one, and it simply consists of adding solvent to an existing solution.
As only solvent is being added, the consequence is that by not increasing the amount of solute, but if the amount of solvent, the concentration of the solute decreases.
The expression for the dilution calculation is:
Ci* Vi = Cf* Vf
where:
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volumeIn this case:
Ci= ? Vi: 25 mL Cf: 0.1 M Vf: 30.3 mLReplacing:
Ci* 25 mL= 0.1 M* 30.3 mL
Solving:
[tex]Ci=\frac{0.1 M*30.3 mL}{25 mL}[/tex]
Ci=0.1212 M
The concentration of the original KOH solution is 0.1212 M.
Which pair of elements will form an ionic bond?
a. Potassium and Oxygen
b. Iron and Barium
C. Sulfur and Nitrogen
d. Calcium and Silicon
I believe that the answer is A.
The combination of potassium (K) and oxygen (O2) produces K2O (potassium oxide). The balanced equation is 2K + O2 ==> K2O.
can anyone tell me the answer
Answer:
A. A as concentration decreases.
Explanation:
A represents a reactant and B is a product, the concentration of the latter increases at the expense of the concentration of the former. Hence, A is the reactant of the chemical reaction as its concentration decreases.
What are the two limitations of earth plates
Answer:
The tectonic style and viability of modern plate tectonics in the early Earth is still debated. Field observations and theoretical arguments both in favor and against the uniformitarian view of plate tectonics back until the Archean continue to accumulate. Here, we present the first numerical modeling results that address for a hotter Earth the viability of subduction, one of the main requirements for plate tectonics. A hotter mantle has mainly two effects: 1) viscosity is lower, and 2) more melt is produced, which in a plate tectonic setting will lead to a thicker oceanic crust and harzburgite layer. Although compositional buoyancy resulting from these thick crust and harzburgite might be a serious limitation for subduction initiation, our modeling results show that eclogitization significantly relaxes this limitation for a developed, ongoing subduction process. Furthermore, the lower viscosity leads to more frequent slab breakoff, and sometimes to crustal separation from the mantle lithosphere. Unlike earlier propositions, not compositional buoyancy considerations, but this lithospheric weakness could be the principle limitation to the viability of plate tectonics in a hotter Earth. These results suggest a new explanation for the absence of ultrahigh-pressure metamorphism (UHPM) and blueschists in most of the Precambrian: early slabs were not too buoyant, but too weak to provide a mechanism for UHPM and exhumation.
Explanation:
Li + HCl → H2 + Lici
(hurry pls)Carl plugs in a lamp that has 0.67 of resistance and 8.1 volts running through it. What is the amount of current running through the lamp? C 543 A C 0.08 A C 12.09 A C743 A
Answer:
C)12.09 Ampere
Explanation:
V= IR
Where I= current of the system
R= resistance= 0.67 ohm
V= potential difference=8.1 volts
Substitute the values
8.1= I× 0.67
I= 8.1/0.67
=12.09 Ampere
(10 POINTS!!!!!!!!!!!
What environmental change will take place when harmful substances get into the food and water supply of animals or plants?
A Climate change
B Increased predators
C Lack of food
D Pollution
need asap
Answer:
A climate change
Explanation:
the surrounding area would be effected in all ways imaginable, such as change in air, soil, water, plants, animals. and if you eat those said animals those harmful things can transfur into you
3. If a gas has a pressure of 32.1 psi at a temperature of 25°C, then what is the new pressure if the temperature is increased to 75°C?
Answer:
P2 = 37.5 psi
Explanation:
P1 = 32.1 psi
T1 = 25°C + 273 = 298K
T2 = 75°C + 273 = 348K
P2 = ?
P1/T1 = P2/T2
or
P2 = (T2/T1)P1
= (348K/298K)(32.1 psi)
= 37.5 psi
17 moles of oxygen is equals to how many grams
17 × ( 2 × 16 ) = 17 × 32 = 544 grams
___________________________
Select the correct structure that
corresponds to the name.
2,2-dimethyl-3-hexyne
A. CH3CH2C=CC(CH3)3
B. CH3CH(CH3)C = CCH(CH3)2
C. both
Answer: A
Explanation:
The correct structure of the name of the compound given is CH₃CH₂C=CC (CH₃)₃.
What is 2,2-dimethyl- 3- hexyne?Dimethyl hexyne is an organic compound. Its chemical formula is C8H14. The compound hexyne is used to make a complex compound, agrochemical, and pharmaceutical compounds.
Thus, the correct option is A, CH₃CH₂C=CC (CH₃)₃.
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why would an electric vehicle be allowed to travel in the high occupancy vehicles lands with only one driver ?
Answer:
because it could self drive
Explanation:
idrk but thats my answer
When carbon disulfide, CS2, forms from its elements. Heat is absorbed. How much heat would be required to produce 5.0 moles of carbon disulfide
Answer:
5.9 × 10² kJ
Explanation:
When carbon disulfide, CS₂, forms from its elements, heat is absorbed. The corresponding value for the standard enthalpy of formation of carbon disulfide is 117.36 kJ/mol. The thermochemical equation that represents this process is:
C(graphite) + 2 S(s, rhombic) ⇒ CS₂(g) ΔH°f = 117.36 kJ/mol
117.36 kJ of heat are absorbed when 1 mole of CS₂ is formed. The amount of heat absorbed when 5.0 moles of CS₂ are formed is:
5.0 mol × 117.36 kJ/mol = 5.9 × 10² kJ
PLEASEEEE HELP THIS IS SCIENCE
IGNORE THE QUESTIONS WHERE I ANSWERED, I GUESSED
Answer:
where is the answer??
Please do not just take the points without answering the question.
How many energy levels does an atom of carbon have?
Answer:
6
Explanation:
The H3O+ ion concentration of a solution is 1 × 10–5 mole per liter. This solution is
A. acidic and has a pH of 5
B. acidic and has a pH of 9
C. basic and has a pH of 5
D. basic and has a pH of 9
The given [tex]H_3O^+[/tex] ion concentration of a solution is an acidic solution and has a pH of 5.
How does the pH scale measure?The letters pH stand for the potential of hydrogen since pH is effectively a measure of the concentration of hydrogen ions (that is, protons) in a substance.The pH scale measures the relative acidity and alkalinity of solutions.It's a negative logarithmic scale of base ten that measures the potential of a solution to accept protons in the form of hydrogen ions.A pH scale ranges from 0 to 14 with 7 being neutral. A pH lower than 7 is considered acidic and a pH greater than 7 is considered basic (alkaline).What is the pH value of an [tex]H_3O^+[/tex] ion?pH can be calculated by using the following equation:
pH = -1(log[H3O+])
Where [H3O+] is the concentration of hydronium ions (hydrogen ions).
The concentration is given as 1 × [tex]10^-^5[/tex] mole per liter.
So, if [H3O+] = 1x[tex]10^-^5[/tex] mol/L,
then the pH = -1(log(1 × [tex]10^-^5[/tex] )) = 5
So, the pH of the given solution is 5. The value is less than 7. Hence it is considered an acidic solution.
Therefore, The given solution is an acidic solution with a pH of 5.
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A student wants to determine if a
sample of tap water contains Mg+2.
Which of the following pieces of
information are not needed to do a
titration ?
Answer:
The Density of Magnesium.
Explanation:
Oxygen has a very low boiling point and is a gas at room temperature. Water has a much higher boiling point and is a liquid at room
temperature. Which of these statements would support these facts?
A)
Oxygen is an element while water is a compound.
B)
Oxygen is diatomic and exist as O2 in nature.
Water has a higher attraction between its molecules than oxygen.
D)
Water is a molecule with 3 atoms and oxygen exists in groups of 2.
Answer is C
can someone answer dis:
3) When you take the atomic weight and subtract the atomic number, you are finding the number of __________ in the atom.
Answer:
If we subtract the atomic number from the atomic mass: atomic mass - atomic number = number of protons + number of neutrons - number of protons. Thus we get the number of neutrons present in an atom when we subtract the atomic number from the atomic mass.
Explanation: hope this helps???
name 3 common acids that you use in your home
Answer:
vinegar, soft drinks, seltzer water , citrus fruits
Explanation:
At 20°c solubility of sugar is 179.How much gram of sugar is needed to prepare saturated solution with 40gm of water
Answer: Volume is 22,3 ml
Explanation: I assume solubility is expressed to 100 ml water
You can use proportion : 179 g / 100 ml water = 40 gm/ V
Multiplying the proportion gives 179 g · V = 100 ml · 40 g | : 179 g
V = 4000 ml / 179 = 22,3 ml
If an element forms a 1- ion, in which group of the periodic table would you
expect to find it?
O A. 18
B. 2
C. 1
O D. 17
Answer:
D. 17
Explanation:
Halogens (group 17) are most likely to form a -1 ion. This is because they want to complete their octet. A prime example of this is sodium chloride. Sodium chloride is an ionic compound. Sodium gives up its valence electron, therefore, recieving a +1 charge, and Chlorine takes it, giving it a -1 charge. Chlorine is also in group 17, halogens.
Answer: the answer is D.17
Explanation:
Calculate the new temperature when a container of
gas has a pressure of 795 mm Hg at 273 K and the
pressure is lowered to 358 mm Hg.
(Gay Lussac's Law) P1T2/P2T1
- 0.00165
- 246
- 123
- 606
Answer: The new temperature of container is 123 K.
Explanation:
Given: [tex]P_{1}[/tex] = 795 mm Hg, [tex]T_{1}[/tex] = 273 K
[tex]P_{2}[/tex] = 358 mm Hg, [tex]T_{2}[/tex] = ?
Formula used to calculate the new temperature is as follows.
[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\\\frac{795 mm Hg}{273 K} = \frac{358 mm Hg}{T_{2}}\\T_{2} = 123 K[/tex]
Thus, we can conclude that the new temperature of container is 123 K.
Use the given Nernst equation and reaction to solve this problem. What is the potential of this cell with the given conditions?
2Li (aq) + F2(g) 2Li+(aq) + 2F- (aq)
E° = +5.92 volts
T = 200°C
[Li+] = 10.0 molar
[F-] = 10.0 molar
Answer:
The 2nd one is the one
Explanation:
and it isn't writen out all the way
What is the oxidation state of Carbon in CaC2O4?
Answer:
The oxidation state of carbon in CaC204 is 3
What is the number of moles in 10.62 L of H2S gas at STP?
Answer:
0.474 moles
Explanation:
divide 10.62 by 22.4.
What is a galvanic cell made of
Answer: A galvanic cell consists of two different metals (electrodes) connected through a conducting solution (an electrolyte) and also connected externally completing a circuit.
if an atom has 4 protons, 5 neutrons, and 4 electrons, what would its atomic mass be?
Answer:
4
Explanation:
If I remember correctly, the atomic # will always be the same as the # of electrons
La suma de los números de masa de tres isótopos es 126 y la suma de los números de neutrones es 60. Hallar la configuración electrónica de uno de los isótopos, si su carga eléctrica es 1- . b) Determine grupo y periodo para dicho elemento. c) Determine los cuatro números cuánticos para el ultimo electrón. d) Si el elemento que hallaron se une con el elemento flúor que tipo de enlace formará.
A. The electronic configuration for the isotope we want is as follows:
[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex].
B. The element belongs to period 3 and group 18.
C.The last electron's four quantum numbers are:
m_s = +1/2 or -1/2 (since the electron can spin up or spin down)
D. With fluorine, the element will develop an ionic connection.
What is an Electronic configuration?The positioning of electrons within an atom, molecule, or other physical structure, such as a crystal, is referred to as electronic configuration. It is typically represented by an array of numbers, letters, or superscripts that denote the number of electrons in each atom or molecule's shell or subshell.
Let the first isotope's mass number be x, the second isotope's mass number be y, and the third isotope's mass number be z. Also, let the first isotope's neutron number be a, the second isotope's neutron number be b, and the third isotope's neutron number be c. Using the information provided, we can construct two equations:
126 = x + y + z (equation 1)
a+b+c=60 (equation 2)
Because all three isotopes contain the same amount of protons, we can infer that their electrical configurations are the same. As a result, all that remains is to determine the electrical structure of one of the isotopes.
We can use the fact that the total of the mass numbers is equal to the amount of protons plus the number of neutrons. Let m be the isotope's mass number and z be the number of protons (the atomic number). Then:
m = z + n, where n is the number of neutrons.
The electrical arrangement of an element can also be used to calculate the atomic number. Assume if the isotope we're seeking for is a periodic table element. The element's electrical configuration can be written as:
[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex]
The configuration's last electron is in the (n+1)s or (n+1)p orbital. As a result, we may calculate the atomic number by counting the number of electrons in the arrangement. For example, the atomic number for the aforementioned electrical configuration is 18 (2 + 8 + 8).
Let's look for the electrical configuration of the isotope we're after. Because the element's electrical configuration is not specified, we can presume it is a noble gas. As an example, consider argon (Ar), which has the electrical configuration:
[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex]
Because argon belongs to period 3 and group 18 (also known as group 8A), the isotope we seek belongs to period 3 and group 18. This is due to the fact that atoms in the same class have the same amount of valence electrons and chemical characteristics.
As a result, the electrical configuration of the isotope we seek is:
[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex]
b) The element belongs to period 3 and group 18.
c) The last electron's four quantum numbers are:
Because the electron is in the 3p orbital, n = 3 l = 1.
Because there are three 3p orbitals, m_l = -1, 0, or 1.
m_s = +1/2 or -1/2 (since the electron can spin up or spin down)
d) With fluorine, the element will develop an ionic connection. Because the element belongs to group 18, it has 8 valence electrons, making it a stable noble gas configuration. It may gain one electron to make a 1- ion or lose eight electrons to form an 8+ ion to obtain this state. Fluorine has seven valence electrons and can gain one electron to produce.
Therefore, the electronic configuration for the isotope we want is as follows:
[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex]
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Your question is in Spanish, but the English translation of the question is:
The sum of the mass numbers of three isotopes is 126 and the sum of the neutron numbers is 60. Find the electronic configuration of one of the isotopes if its electric charge is
1- b) Determine group and period for said element.
c) Determine the four quantum numbers for the last electron.
d) If the element they found joins with the fluorine element, what type of bond will it form?
Name of compound 6T ?
Answer:
Explanation:
I serched for it i found name is :sexithiophene