Explanation:
The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. ... Atoms of nonmetals tend to gain electrons in order to fill their outermost principal energy level with an octet.
According to the selection, what is the main weakness of the tortoise?
Answer:
Nose
Explanation:
Because every time I touch it's nose, it will hide itself into the shell faster than other places
Hi!the main weakness of the tortoise is it's shell.The most shell of tortoise are so hard that most animals can't even make a scratch on it But flip one over and getting up will be a huge problem. They can suffer from dehydration or get picked off by predators. And even though reptiles are sun loving, they still can't regulate their body temperature and this could lead to over heating and death.
Acetic acid and water react to form hydronium cation and acetate anion, like this:
HCH3CO2(aq) + H2O(l) → H3O^+ (aq) + CH3CO2^-(aq)
Imagine 226. mmol of CH3CO2- are added to a flask containing a mixture of HCH3CO2, H2O, H3O and CH3CO2- at equilibrium, and then answer the following question.
What is the rate of the reverse reaction before any CH3CO2^- has been added to the flask?
Answer:
The answer is "Greater than zero, and greater than the rate of the reverse reaction".
Explanation:
It applies a rate of reaction to the balance, a forward response dominates until it reaches a constant. This process is balanced before 52 mmol of the reactant[tex]HC H_{3} \ CO_2[/tex], to which 3 is added. In balance, that rate of the forward reaction was its rate with forwarding reaction, both of which are higher than 0 as the response has achieved balance so that both species get a level greater than 0.
5. A sample of pure acetyl salicylic acid had a mass of 0.268 grams. It was dissolved in NaOH and diluted to 500.00mL in a volumetric flask.
a. What is the concentration of aspirin in the solution?
b. If an 8.00mL sample of this solution was pipetted into a volumetric flask and diluted to 100.00mL, what is the concentrated of aspirin after this dilution?
Answer:
a. 5.36x10⁻⁴ g/mL
b. 4.29x10⁻⁵ g/mL
Explanation:
As the units for concentration are not specified, I'll respond using g/mL.
a. We divide the sample mass by the final volume in order to calculate the concentration:
0.268 g / 500 mL = 5.36x10⁻⁴ g/mLb. We can use C₁V₁=C₂V₂ for this question:
8.00 mL * 5.36x10⁻⁴ g/mL = C₂ * 100.00 mL C₂ = 4.29x10⁻⁵ g/mL3. Which of the following statements best describes friction?
a. It is a force that occurs between solids.
b. It is a force that occurs only on rough surfaces.
c. It is a force that occurs between solids and liquids.
d. It is a force that occurs when surfaces touch each other.
pls help
Answer:
d.
Explanation:
It is a force that occurs when surfaces touch each other.
The blue colour of the sky results from the scattering of sunlight by air molecules. Blue light has a frequency if about 7.5*10^14Hz
Calculate the energy of a mole of photon associated with this frequency
Answer: The energy of a mole of photon associated with this frequency is [tex]49.5\times 10^{-20}J[/tex]
Explanation:
The energy and frequency are related by :
[tex]E=N\times h\times \nu[/tex]
E = energy of photon
N = number of moles = 1
h = planks constant = [tex]6.6\times 10^{-34}Js[/tex]
[tex]\nu[/tex] = frequency = [tex]7.5\times 10^{14}Hz[/tex]
[tex]E=1\times 6.6\times 10^{-34}Js\times 7.5\times 10^{14}s^{-1}=49.5\times 10^{-20}J[/tex]
The energy of a mole of photon associated with this frequency is [tex]49.5\times 10^{-20}J[/tex]
NEED HELP ASAP FREE BRAINLIST
Answer:
7) C. Sodium
8) G. 1 valence electron
Explanation:
Which of the following is an empirical formula? a) H2O2 b) H2O c) C2H2 d) C4H8
Answer:
The correct answer is h20
Explanation:
i got it right on an exam.
Some birds migrate 20,000 miles. If 1 mile is 1.6 kilometers, calculate the distance these birds fly in kilometers.
Answer:
32000 kilometers
Explanation:
In order to convert from miles to kilometers, we need to use a conversion factor. In other words, we put miles in the denominator and kilometers in the numerator, as follows:
20000 miles * [tex]\frac{1.6km}{1mile}[/tex] = 32000 kilometersThat way the units for miles cancel each other, leaving the equivalent amount in kilometers.
An unknown amount of water
was heated with 3.5 kJ, raising
its temperature from 26°C to
66°C. What was the mass of
the water?
Answer:
20.9grams
Explanation:
Using the formula:
Q = m × c × ∆T
Where;
Q = amount of heat (joules)
m = mass of substance (g)
c = specific heat of water (4.184 J/g°C)
∆T = change in temperature (°C)
According to the provided information;
Q = 3.5kJ = 3.5 × 1000 = 3500J
m = ?
c of water = 4.184 J/g°C
∆T = 66°C - 26°C = 40°C
Using Q = m × c × ∆T
m = Q ÷ (c × ∆T)
m = 3500 ÷ (4.184 × 40)
m = 3500 ÷ 167.36
m = 20.9
mass = 20.9grams
Calculate the morality of a 35.4% (by mass) aqueous solution of phosphoric acid (H3PO4). Molar mass of H3PO4 is 98.00g/mol
Answer:
no idea with the answer pls check with otherr
Which equation represents a redox reaction?
A. HCI + LiOH
-
LiCl + H20
B. AgNO3 + LICI
AgCl + LINO3
C. HNO3 + KOH - KCl + H20
D. 2NaBr + Cl2
-
2NaCl + Br2
SUBI
Answer:
D. [tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]
Explanation:
Hello!
In this case, for the given set of chemical reactions, it is possible to infer that D. is a categorized as redox due to the following:
Since both chlorine and bromine remain as diatomic gases, their oxidation states in such a form is 0, but as anions with lithium cations they have a charge of - according to the following reaction and half-reactions:
[tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]
[tex]Cl_2^0+2e^-\rightarrow 2Cl ^-\\\\2Br^- \rightarrow Br_2^0+2e^-[/tex]
Unlike the other reactions whereas no change in the oxidation states is evidenced.
Answer:
D. 2NaBr + Cl2
Determine whether each of the following salts will form a solution that is acidic, basic, or pH-neutral.
a. KCl
b. NaClO
c. Al(ClO4)3
d. NH4Cl
e. C5H5NHF
f. NaBr
g. Ca(NO2)2
Answer:
a) Neutral
b) Basic
c) Acidic
d) Acidic
e) Basic
f) Neutral
g)
Explanation:
a) KCl is a neutral salt because K ion in solution form produces both acid and base (KOH)
b) NaClO produces basic solution because ClO− is the conjugate base of a weak acid
c) Al(ClO4)3 will produce acidic solution because ClO4 is component of strong acid
d) NH4Cl will produce acidic solution because NH4+ ion is a strong conjugate acid of the weak base and Cl- is a weak conjugate base of the strong acid
e) Basic
f) Neutral salt
g) Acidic
How many atoms are in 7.2 MOL of Chlorine?
Answer:
7.2 mol * (6.02*10^23)= 4.3*10^24 atoms
Explanation:
The number of atoms in one mole of chlorine contains 6.022 × 10²³ . Therefore the number of Cl atoms in 7.2 moles is 4.3 × 10²⁴.
What is Avogadro number ?One mole of every substance contains 6.022 × 10²³ atoms. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.
Chlorine is 17th element in periodic table. Cl is a non-metal with high electronegativity. The atomic mass of Cl is 35.5 g. Thus, 35.5 g contains Avogadro number of Cl atoms.
One mole of Cl contains 6.022 × 10²³ atoms. Tus, number of atoms in 7.2 mol is Avogadro number times the number of moles.
no.of atoms = 6.022 × 10²³ × 7.2 = 4.3 × 10²⁴ atoms.
Therefore, 7.2 moles of Cl contains 4.3 × 10²⁴ atoms.
Find more on Avogadro number:
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PLEASE HELP :(
What most likely accounts for the difference between curve A and curve B on
the energy diagram?
A. The reaction described by curve B is under greater pressure.
B. The reaction described by curve B is at a different temperature.
C. The reaction described by curve B has higher reactant
concentrations.
D. The reaction described by curve B is occurring with a catalyst.
Answer:
D. The reaction described by curve B is occurring with a catalyst.
Explanation:
The peak in the curve is the activation energy. According to this graph, the activation energy was lowered. A catalyst is what you can use to lower the activation energy.
The most likely accounts for the difference between curve A and curve B on the energy diagram is the reaction described by curve B is occurring with a catalyst, therefore option (d) is correct.
What do you mean by the catalyst in a reaction ?A catalyst is a chemical substance which alters the rate of a reaction without itself undergoing any permanent chemical change.
A catalyst does not initiate a chemical reaction. A catalyst does not be consumed in the reaction.
Catalysts tend to react with reactants to form intermediates and at the same time facilitate the production of the final reaction product. After the whole process, a catalyst can regenerate.
Catalysts encourage molecules to react and make the whole reaction process easier and efficient.
The most likely accounts for the difference between curve A and curve B on the energy diagram is the reaction described by curve B is occurring with a catalyst, ,hence option (d) is correct.
Learn more about catalyst ,here:
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What are at least 3 pros of using solar energy ?
Answer:
Renewable Energy Source. Among all the benefits of solar panels, the most important thing is that solar energy is a truly renewable energy source
Reduces Electricity Bills
Diverse Applications
Explanation:
What is happening to the particles in a substance during evaporation?
O The particles are losing energy and slowing down.
O The particles are giving off light.
O The particles are gaining energy and speeding up.
O The particles are getting closer together.
Answer:
C
Evaporation happens when a liquid substance becomes a gas. When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor.
I NEED HELP ASAP PLEASE GIVING BRAINLIEST!
Answer: Frequency
Explanation: Without a doubt my answer is Frequency, none of the other options have nothing to do with sound waves so Frequency is my best bet.
Which of the following represents the atomic number of an element?
Answer:
The atomic number is the number of protons in the nucleus
how are atoms an example of unity?
A. All atoms have the same arrangement of electrons.
B. All atoms react with other atoms the same way.
C. All atoms of one kind share common properties.
D. All atoms have the same number of neutrons.
Answer: C. All atoms of one kind share common properties.
Explanation:
a. on the right with the long wavelengths
b. in the middle
c. on the left with the short wavelengths
d. we can see the whole thing
:)
Answer:
b. in the middle
Explanation:
your answer choice is correct!
A balloon is floating around outside your window. The temperature outside is -1 °C, and the air pressure is 0.800 atm. Your neighbor, who released the
balloon, tells you that he filled it with 5.00 moles of gas. What is the volume of gas inside this balloon?
Express your answer to three significant figures and include the appropriate units.
View Available Hint(s)
HA
?
Vballoon
Value
Units
Submit
Part B
A 14.0 L gas cylinder is filled with 5.00 moles of gas. The tank is stored at 7 °C. What is the pressure in the tank?
Express your answer to three significant figures and include the appropriate units.
View Available Hint(s)
Answer:
140 L (3 sig-figs; includes the zero)*
Explanation:
PV = nRT => V = nRT/P
P = 0.800atm
V = ?
n = 5 moles
R =0.08206 L·atm/mol·K
T = -1°C = (-1 + 273)K = 272K
V = nRT/P = (5mol)(0.08206 L·atm/mol·K)(272K)/(0.800atm) = 139.5 L
*=> 140 Liters (3 sig-figs) => zero is a sig-fig b/c it was result of rounding 139.5 Liters to obtain 140 Liters.
What is 17647.05882 rounded to 2 significant figures?
thermal energy lab report
does Al3+ gain or loose electrons?
Answer:
gain
Explanation:
when ammonium nitrate is found at a fire scene, it may undergo thermal decomposition producing which materials?
Answer:
nitrous oxide
Explanation:
An aqueous solution is produced by dissolving 1.5 g of barium hydroxide (Ba(OH)2(aq) in enough water
to make 0.250 L.
a) write the dissociation reaction of barium hydroxide
b) calculate the molar concentration of OH(aq)
13
c) calculate pH
Answer:
A. Ba(OH)₂ (aq) <==> Ba²⁺ (aq) + 2OH¯ (aq)
B. The molar concentration of OH¯ is 0.072 M
C. The pH of the solution is 12.86
Explanation:
A. Dissociation equation
Barium hydroxide Ba(OH)₂ dissolves in water by the following equation:
Ba(OH)₂ (aq) <==> Ba²⁺ (aq) + 2OH¯ (aq)
B. Determination of the molar concentration of OH¯.
We'll begin by calculating the number of mole in 1.5 g of Ba(OH)₂. This can be obtained as follow:
Mass of Ba(OH)₂ = 1.5 g
Molar mass of Ba(OH)₂ = 137 + 2(16 + 1)
= 137 + 2(17)
= 137 + 34
= 171 g/mol
Mole of Ba(OH)₂ =?
Mole = mass / Molar mass
Mole of Ba(OH)₂ = 1.5 / 171
Mole of Ba(OH)₂ = 0.009 mole
Next, we shall determine the molarity of Ba(OH)₂. This can be obtained as follow:
Mole of Ba(OH)₂ = 0.009 mole
Volume of solution = 0.250 L
Molarity of Ba(OH)₂ =?
Molarity = mole / Volume
Molarity of Ba(OH)₂ = 0.009 / 0.250
Molarity of Ba(OH)₂ = 0.036 M
Finally, we shall determine the molar concentration of OH¯.this can be obtained as follow:
Ba(OH)₂ (aq) <==> Ba²⁺ (aq) + 2OH¯ (aq)
From the balanced equation above,
1 mole of Ba(OH)₂ produced 2 moles OH¯.
Therefore, 0.036 M Ba(OH)₂ will produce = 0.036 × 2 = 0.072 M OH¯.
Therefore, the molar concentration of OH¯ is 0.072 M
C. Determination of the pH.
We'll begin by calculating the pOH of the solution. This can be obtained as follow:
Concentration of OH¯, [OH¯] = 0.072 M
pOH =?
pOH = –Log [OH¯]
pOH = –Log 0.072
pOH = 1.14
Finally, we shall determine the pH. This can be obtained as follow:
pOH = 1.14
pH =?
pH + pOH = 14
pH + 1.14 = 14
Collect like terms
pH = 14 – 1.14
pH = 12.86
How are ionic bonds like magnets??
Answer:the opposite charge attracts like magnets
Explanation:
Which type of material incorporates a variety of substances to enhance desired properties such as strength and flexibility?
Answer:
its a polymer
Explanation:
Which of the following statements best explains why the atomic radius increases from top to bottom of the periodic table? A. The electronegativity decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. B. For the atoms lower in the periodic table, there is more difference in charge between the electrons and the protons, which allows electrons to orbit farther from nucleus. C. The ionization energy decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.
Answer:
D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.
Explanation:
Atomic radius increases down the group because down the group, there an increase in the number of principle energy levels occupied. Now, these higher principal energy levels are made up of orbitals that are larger than the orbitals from the lower energy levels in size.
Therefore, the effect of this is that the greater number of principal energy levels will outweigh the increase in nuclear charge since nuclear charge also increases down the group and this in turn makes the atomic radius to increase as we go down the group.
Answer: C. For the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus.
Explanation: As the valance electrons orbit farther from the nucleus the energy level increases from the top to the bottom of the periodic table. So the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus, which result in an increase in the atomic radius.
Balancing the following chemical equation, and determine its reaction type.
LiCl +
[Br₂ -
LiBr +
_CI2
Answer:
[tex]2LiCl +Br_2 \rightarrow 2LiBr +Cl_2[/tex]
Single displacement reaction.
Explanation:
Hello!
In this case, by firstly rearranging the chemical reaction as shown below:
[tex]LiCl +Br_2 \rightarrow LiBr +Cl_2[/tex]
It is also necessary to balance it at follows:
[tex]2LiCl +Br_2 \rightarrow 2LiBr +Cl_2[/tex]
Thus, since bromine and chlorine are being exchanged as a result of the atoms rearrangement, we infer this is a single displacement reaction.
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