Answer:
in days
Explanation:
A short term environmental change refers to changes in the environment that happens within a short period of time, for example, flooding, drought, volcanic eruptions etc. In contrast to short term environmental change, long term environmental change takes place over a long period of time hence species have a longer time to adapt to it. Short term environmental changes may or may not be caused by humans. An example of a short term environmental change caused by humans is oil spillage. Short term environmental changes may lead to the the migration of species from the ecosystem.
Short term environmental changes usually occur within a very short time. The greatest time frame in which a short term environmental change can occur is in a matter of days. Only longterm environmental changes span hundreds and thousands of years.
Answer:
it is c
Explanation:
i took the test :)
Why would it be more comfortable to walk on hot beach sand in flip-flops
than without them?
O A. Thermal insulation is blocked by the flip-flops.
B. Convection warming is blocked by the flip-flops.
C. Radiation warming is blocked by the flip-flops.
O D. Thermal conduction is blocked by the flip-flops.
Answer:
D. Thermal conduction is blocked by the flip-flops.
Explanation:
Convection is a process of heat transfer which involves fluids( liquid or gas). This however rules convection out of the answer.
Radiation involves heat transfer from the sun to bodies on earth.
Conduction involves heat transfer between two solid bodies. Hot beach sand and flip-flops are solid bodies which validates thermal(heat) conduction.
Question 11
A solution cannot dissolve any more solute even though only a small amount of solute has
been added to the solvent. This solution is
1. saturated and concentrated
2. unsaturated and dilute
3. saturated and dilute
4. unsaturated and concentrated
Answer:
Explanation:
B.) Saturated
A saturated solution is when the maximum amount of solute that could be dissolved in that solvent volume at that temperature and pressure has been dissolved, adding more solute beyond this point would lead to the additional solute not dissolving in the solvent. When the maximum solute concentration in the solution that can be dissolved has been reached the solution is said to be saturated.
Hope This Helps??
Select all statements that are true for Sn1 reactions. (a) Formation of the carbocation is the rate-determining step (RDS) (b) The reaction rate depends upon the concentration of both the nucleophile and the electrophile (c) Reactions at chiral carbons proceed with inversion of stereochemistry (d) None of these statements are true for Sn1 reactions (e) Carbocation rearrangements are never observed
Answer:
(a) Formation of the carbocation is the rate-determining step (RDS)
(c) Reactions at chiral carbons proceed with inversion of stereochemistry
Explanation:
SN1 reactions arenucleophilic substitution reactions in which the rate determining step is unimolecular.
The formation of a carbocation is the rate determining step. This depends on the electrophilicity of the leaving group. Thus the SN1 reaction mechanisms is dependent on the electrophile and not the nucleophile.
Polar and acidic solvents which can assist in the formation of the carbocation speeds up the rate determining step.
If the formation of carbocation occurs at a chiral center, both retention and inversion of stereochemistry are likely to occur.
Therefore, the correct options are A and C.
Why are prefixes not used in naming ionic compounds?
A. Two ions can combine in only one combination.
B. The number of ions is not fixed in a compound.
C. A roman numeral is used instead of a prefix
D. A subscript follows each name instead of a prefix.
Answer:
A.
Explanation: thats what i got right on the quiz lol
Prefixes are not used in naming ionic compounds because two ions can combine in only one combination.
It is common in organic chemistry and with a few other molecular species, to name the compound using a prefix such as di, tri, tetra etc to indicate the positions of moieties in the molecule. This is important because there could be several possible combinations of atoms in a molecule.
In the case of ionic compounds, the combining ions can only have one possible arrangement.
Hence, the reason why prefixes are not used in naming ionic compounds is because two ions can combine in only one combination.
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How do you solve this
Answer:
23.6°C
Explanation:
Step 1:
Data obtained from the question. This include the following:
Mass = 0.125kg = 0.125 x 1000 = 125g
Initial temperature (T1) = 22°C
Heat (Q) generated in 4.5mins = 835J
Specific heat capacity (C) of water = 4.184J/g°C
Change in temperature (ΔT) =?
Final temperature (T2) =?
Step 2:
Determination of the change in temperature, ΔT of water.
This can be obtained as shown below:
Q = MCΔT
835 = 125 x 4.184 x ΔT
Divide both side by 125 x 4.184
ΔT = 835 / (125 x 4.184)
ΔT = 1.6°C
Therefore, the change in temperature, ΔT is 1.6°C
Step 3:
Determination of the final temperature of water.
This can be obtained as follow:
Initial temperature (T1) = 22°C
Change in temperature (ΔT) = 1.6°C
Final temperature (T2) =?
Change in temperature (ΔT) = Initial temperature – Final temperature
ΔT = T2 – T1
1.6 = T2 – 22
Collect like terms
T2 = 1.6 + 22
T2 = 23.6°C
Therefore, the final temperature of the water is 23.6°C.
This is how fluorine appears in the periodic table. A green box has F at the center and 9 above. Below it says fluorine and below that 19.00. A blue arrow points to 9. What information does "9” give about an atom of fluorine? Select three options. the atomic number the atomic mass the number of protons the number of electrons the number of neutrons
Which of the following is true for a gas under conditions of very low temperature? PV ÷ nRT = 1, because all gases behave ideally at very low temperatures. PV ÷ nRT = 1, because the actual volume of the gas molecules becomes considerable. PV ÷ nRT > 1, because the low temperatures speed up the particles. PV ÷ nRT < 1, because particles are unable to overcome intermolecular attractions.
HELP MY CHEMISTRY NERDS PLEASE PLEASE PLEASE !!!!! I WILL LUV U 4EVER
Answer:
A. 40 kPa
Explanation:
P(total) = P(O2) + P(N2) + P(CO2)
300kPa = 160 kPa + 100kPa + P(CO2)
P(CO2) = 300-160-100= 40 kPa
Strontium, a group 2 element with an electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 , will form a _____ ion in a chemical bond.
+1
+2
-1
-2
Answer:
Strontium, a group 2 element with an electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² , will form a +2 ion in a chemical bond.
Explanation:
An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.
So an ion is an atom or group of atoms that have an electric charge. A cation is an ion that has a positive charge.
The alkali metals in the earth (Elements IIA) lose two electrons to form a 2+ cation. Strontium is an alkali metal that loses the two electrons belonging to 5s², forming the +2 ion.
Answer:
+2
Explanation:
What happens to the total mass of a substance undergoing a physical change
Answer: It stays the same
Explanation:
Answer: it stays the same (A)
Explanation:
did the test online got 100%
Please Help In need of chemistry help
The reaction CH4 + Br2 → CH3Br + HBr is an example of
1.Addition
2.Polymerization
3.Substitution
4.Hydrogenation
Which of the following contribute(s) to most of the mass of an atom?
O A) Protons and electrons
B) Protons only
C) Protons and neutrons
OD) Neutrons only
Answer:
C) protons and neutrons
Explanation:
im pretty sure it is c
Se construye una pila galvánica con una barra de cobre sumergida en una disolución 1M de cationes Fe+2 y una barra de plata sumergida en una disolución 1M de da cationes Ag+ , Calcular el potencial estándar de la celda teniendo en cuenta que a 25°C: Cu+2/Cu = -0.34V Ag+/Ag = 0.80V
Answer:
El potencial celular estándar, [tex]E_{cell}[/tex] is +0.46 V
Explanation:
Las reacciones de media célula son;
Media reacción del ánodo Cu²⁺ + 2e⁻ ↔ Cu, E ° = 0.34 V
Media reacción catódica 2Ag + 2e⁻ ⁻ 2Ag, E ° = 0.80 V
Sin embargo tenemos para hierro Fe²⁺ + 2e⁻ ↔ Fe, E ° -0.44 V
y Fe³⁺ + e⁻ ↔ Fe²⁺, E ° = 0.77 V
que es más alta que la del cobre presente, por lo tanto, el cobre se oxidará en el ánodo
Por lo tanto, en el ánodo, tendremos
Cu → Cu²⁺ + 2e⁻ (E ° = -0.34 V)
En el cátodo
2Ag + 2e⁻ → 2Ag (E ° = 0.80 V)
[tex]E_{cell} = E_c + E_a = -0.34 + 0.8 = +0.46 \, V[/tex]
El potencial celular estándar, [tex]E_{cell}[/tex] = +0.46 V
to the
of the substances.
DONE
Answer
what do you mean?
Explanation:
im confused
Answer:
Sorry. I don't understand
Explanation:
WILL GIVE BRANLIEST TO FIRST ANSWER!!! I know the correct answer is either a or d. Can anyone explain which one it is and why? CH3C ≡ CCH2CH2Cl is named: a. 1-chloro-3-pentyne b. 5-chloro-2-pentene c. 1-acetylenyl-3-chloropropane d. 5-chloro-2-pentyne
Answer: The IUPAC name of [tex]CH_3C\equiv CCH_2CH_2Cl[/tex] is 5-chloro-2-pentyne
Explanation:
1. First select the longest possible carbon chain. For the number of carbon atom, we add prefix as 'meth' for 1, 'eth' for 2, 'prop' for 3, 'but' for 4, 'pent' for 5, 'hex' for 6, 'sept' for 7, 'oct' for 8, 'nona' for 9 and 'deca' for 10.
2. The longest possible carbon chain should contain all the bonds and functional groups.
3. The numbering is done in such a way that the carbon containing the functional group or substituent gets the lowest number. Triple bond is given priority over substituent halogen.
4. The naming of alkane is done by adding the suffix -ane, alkene by adding the suffix -ene, alkyne.
Thus the IUPAC name of [tex]CH_3C\equiv CCH_2CH_2Cl[/tex] is 5-chloro-2-pentyne
What is the frequency of radiation emitted by a photon of light if the energy released during its transition to ground state is 3.611 × 10-15 joules? (Planck's constant is 6.626 × 10-34 joule seconds)
Answer:
5.449 x 10¹⁸ Hz
Explanation:
Energy (E) =Frequency (F) x Plancks constant (h)
F= 3.611x10⁻¹⁵J / 6.626 x 10⁻³⁴ Js⁻¹
F =5.449 x10¹⁸ s⁻¹ or 5.449 x 10¹⁸ Hz
The mass of an object is measured in _____. liters meters degrees kilograms
A balloon has a volume of 10,500 liters, and the temperature is 15°C. If the temperature were -25°C, what would the volume of the balloon be?
12,194 L
9,042 L
12,194 L is the answer!
Explanation:
Water has the maximum density at the temperature of 4°Celsius. So, it expands at temperatures higher or lower than 4°C, knowing that at the temperature of -25°C the water can't have a lower volume than the one at 15°C.
Answer:
12, 194 L
That's your answer!!!
The reaction 2 NO(g) ⇌ N2(g) + O2(g) has a value of Keq = 2400 at a temperature of 2000 K. If 0.570 mol of NO(g) is initially placed in a 3.0 L container, calculate the equilibrium concentrations of each gas
Answer:
[tex][N_2]_{eq}=0.094M[/tex]
[tex][O_2]_{eq}=0.094M[/tex]
[tex][NO]_{eq}=0.002M[/tex]
Explanation:
Hello,
In this case, for the given chemical reaction, we write the following law of mass action:
[tex]Keq=\frac{[N_2][O_2]}{[NO]^2}[/tex]
That in terms of the change [tex]x[/tex] due to the reaction extent (ICE procedure) we can write:
[tex]Keq=\frac{x*x}{([NO]_0-2x)^2}[/tex]
Thus, the initial concentration of nitrogen monoxide is:
[tex][NO]_0=\frac{0.570mol}{3.0L} =0.19M[/tex]
Thereby, we write:
[tex]2400=\frac{x*x}{(0.19-2x)^2}[/tex]
That we can solve by suing the quadratic equation formula or solver to obtain two roots:
[tex]x_1=0.094M\\x_2=0.096M[/tex]
Nevertheless, the correct answer is 0.094 M since the other root will produce a negative concentration of nitrogen monoxide at equilibrium, therefore, the equilibrium concentrations turn out:
[tex][N_2]_{eq}=x=0.094M[/tex]
[tex][O_2]_{eq}=x=0.094M[/tex]
[tex][NO]_{eq}=0.19M-2x=0.19M-2(0.094M)=0.002M[/tex]
Best regards.
D. Answer the following questions in one word or a single sentence.
1. The metal foil used for wrapping food is made up of which metal
2. Which metal is used in thermometers?
3. Which non-metal is essential for breathing?
4. What is the alloy of iron, nickel and chromium known as?
5. Name the gas released when metals react with acids.
Answer:
According to the numbers 1-5;Aluminium,Mercury,Oxygen,Stainless Steel,Hydrogen gas.
Explanation:
metallic pan is provided with a wooden plastic handle give reason
The metallic pan iis most likely going to be used on a stove.
The stove is heating something, and the conductive metallic pan will, well, conduct that heat throughout the entire body of the pan. Doing this will spread the heat to the handle, burning your hands.
Both wood and plastic are insulators, and they do not conduct heat or electricity. They will insulate your hands and protect them from the heat.
How many moles are there in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid?
Answer:
0.25moles
Explanation:
There are 1000[tex]cm^{3}[/tex] for 1[tex]dm^{3}[/tex]
Therefore in 1000[tex]cm^{3}[/tex] of 0.5 mol/[tex]dm^{3}[/tex] solution has = 0.5 moles
Therefore 500[tex]cm^{3}[/tex] contains = 0.5/1000 x 500 = 0.25moles
The number of moles of sulfuric acid in 0.5 mol/dm³ solution is equal to 0.25 mol.
What is the molarity?The concentration of the solution can be determined as the number of moles of a solute in per unit volume of a solution is known as molarity or molar concentration.
The Molarity of the solution is calculated in the following formula:
Molarity (M) = Moles (n)/Volume of the Solution (in L)
Now if we have to find the number of moles of solute in the solution, the formula becomes:
Number of moles of solute (n) = Molarity (M) × Volume of the Solution
Given, the concentration of the sulfuric acid solution = 0.5 mol/dm³
The volume of the solution, V = 500 cm³
As we know, 1 dm³ = 10³ cm³, the volume of solution = 0.5 dm³
The number of moles of the sulfuric acid = M × V
= 0.5 × 0.5 = 0.25 mol
Therefore, 0.25 moles of sulfuric acid in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid.
Learn more about molarity, here:
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Compare the wavelength and energy of ultraviolet rays to visible light
Answer:
Visible wavelengths range from 0.0007 milimeters for red light, through orange, yellow, green, and blue, to 0.0004 milimeters for violet light.
Ultraviolet is shorter wavelengths than violet.
Hope This Helps.
The atomicity of bromine is
Answer:
So, the atomicity of noble gases is 1. Example. ... So, the atomicity of hydrogen, nitrogen, oxygen, chlorine, bromine and iodine is 2 each.
Explanation:
So, the atomicity of noble gases is 1. Example. ... So, the atomicity of hydrogen, nitrogen, oxygen, chlorine, bromine and iodine is 2 each.
could help
The recommended dose of aspirin will yield approximately 100.0 micrograms/mL in the blood. How many molecules of aspirin (C9H8O4) are in a drop (0.100 mL) of blood?
Answer:
3.34x10¹⁶ molecules of aspirin are in a drop of blood
Explanation:
The recomended dose of aspirin in blood is 100.0μg/mL =
1x10⁻⁴g aspirin / mL of blood.
In a drop (0.100mL) there are:
0.100mL ₓ (1x10⁻⁴g aspirin / mL of blood) = 1x10⁻⁵g aspirin.
Molecular mass of aspirin is:
9C = 12.01g/mol ₓ 9 = 108.09g/mol
8H = 1.01g/mol ₓ 8 = 8.08g/mol
4O = 16g/mol ₓ 4 = 64g/mol
108.09 + 8.08 + 64 = 180.17g/mol
Thus, moles of aspirin in 1x10⁻⁵g are:
1x10⁻⁵g ₓ (1mol / 180.17g) = 5.55x10⁻⁸ moles of aspirin
In 1 mole, you have 6.022x10²³ molecules, thus:
5.55x10⁻⁸ moles of aspirin ₓ (6.022x10²³ molecules / 1 mole ) =
3.34x10¹⁶ molecules of aspirin are in a drop of bloodAm I correct? Because I’m kinda in between answers
Answer:
yh you are correct. the pattern is correct! :)
Answer:
Yep! :)
Explanation:
Difference between rapid combustion and spontaneous combustion.
Answer: The difference between rapid combustion and spontaneous combustion...
Explanation:
Rapid combustion is a form of combustion, otherwise known as a fire, in which large amounts of heat and light energy are released, which often results in a flame.Whereas spontaneous combustion is the ignition of organic matter (e.g. hay or coal) without apparent cause, typically through heat generated internally by rapid oxidation.
Connie was making sodium chloride by adding an acid to an alkali. She followed the progress of the reaction with a pH sensor .What else could she have used to detect when the reaction was complete?
What Connie could have used to detect when the chemical reaction was complete is an: acid-base indicator.
A chemical reaction is a chemical process that involves the continuous rearrangement (transformation) of either the ionic, atomic or molecular structure of a chemical element through the breakdown and formation of chemical bonds, in order to produce a chemical compound.
When a strong acid such as Hydrogen chloride (HCl) react with a strong alkali such as Sodium hydroxide (NaOH), it gives rise to the formation of Sodium chloride (NaCl) and Water ([tex]H_2O[/tex]);
[tex]HCl + NaOH[/tex] ----> [tex]NaCl + H_2O[/tex]
The progress of the above chemical reaction can be followed by using a pH sensor and the final pH of a strong acid and strong base is seven (7), meaning it is neutral.
However, Connie could make use of an acid-base indicator to detect when the chemical reaction is complete.
An acid-base indicator can be defined as a chemical substance that changes color with respect to the pH (hydrogen ion concentration) of a solution or chemical reaction. Some examples of an acid-base indicator are:
Litmus paper.Methyl red.Red cabbage juice.Bromothymol blue.Methyl orange.Phenolphthalein.In conclusion, an acid-base indicator is typically used for detecting when a chemical reaction between an acid and an alkali is complete.
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Answer:When a strong acid such as Hydrogen chloride (HCl) react with a strong alkali such as Sodium hydroxide (NaOH), it gives rise to the formation of Sodium chloride (NaCl) and Water ();
---->
Explanation:
Triangle W Z Y is cut by bisector Z X. The lengths of sides Z W and Z Y are congruent. ZX bisects ∠WZY. If the measure of ∠YXZ is (6m – 12)°, what is the value of m?
Answer:
m = 17
Explanation:
From the question we were given that
Triangle WZY is bisected by ZX; ZW = ZY
∠YXZ = (6m – 12)°
Based on the characteristics of the triangle, we see that triangle WYZ is an isosceles triangle (that is, triangle WXZ is equal to triangle YXZ)
<YXZ = <WXZ = 90°
Using ∠YXZ = (6m – 12)°
We have:
(6m – 12)° = 90°
6m = 90 + 12 ⇒ 6m = 102
m = 102 ÷ 6 = 17
m = 17
We therefore see that m is equal to 17
Answer:
B: 17
Explanation:
3. How much power is required to pull a sled if you use
60j of work in secound?
Answer:
The answer is 60W
Power = Work done/ time
time = 1 second
Work done = 60J
Power = 60/1
= 60W
Hope this helps.