Answer:
A molecule that has only nonpolar bonds and no polar bonds cannot be polar.
Explanation:
However, a molecule that CONTAINS nonpolar bonds is different, because it can contain polar bonds. A molecule that contains nonpolar bonds can be polar as long as it also contains polar bonds.
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do all species take care of their offspring in the same way?
Answer:
No
Explanation:
not every species take care of their offspring/babies some abandon their babies and leave and some take care of them till they are older
In a chemical reaction, what are the numbers in front of an element called?
Answer:
oxidation numbers
Explanation:
chemical equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while products are the new substances that are formed. The large numbers in front of some of the formulae are called coefficients. These coefficients are used to balance the equation. Chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be equal because matter cannot be created or destroyed
2. Circle all of the following that change with the temperature of a reaction.
3. Draw an arrow on this graph of the Arrhenius equation that shows where you would find ln A (log of the frequency factor).
4. If the slope of the line in the graph above is -350 K, what is the value of Ea (in J/mol)?
Based on the effect of temperature on a reaction, a change in temperature affects the rate constant K.
Based on the Arrhenius equation, the y-intercept gives the value of ln A.
From the value of the slope, the value of Ea is 42.1 J/mol.
What is the effect of temperature on a reaction?A change in the temperature of a reaction acts to increase the rate of reaction.
Change in temperature has no effect on the ideal gas constant.Change in temperature has no effect on the activation energy.Change in temperature has no effect on the concentration of reactants.Change is temperature can either lower or increase the rate constant of a reaction.Change in temperature has no effect on the order of reaction.According to the Arrhenius equation, the y-intercept gives the value of ln A.
From the graph; slope = -Ea/R
Ea = -slope/R
Where;
Ea is activation energy R is molar gas constant = 8.314 J/K.molSlope = -350 KEa = -(-350)/8.314
Ea = 42.1 J/mol
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How many moles of sodium (Na) are there in a
sample of 5.87 x 1024 atoms of sodium?
There are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.
HOW TO CALCULATE NUMBER OF MOLES?The number of moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number. That is;
no. of moles = no. of atoms ÷ 6.02 × 10²³
According to this question, there are 5.87 x 10²⁴ atoms of sodium. The number of moles is as follows:
no. of moles = 5.87 x 10²⁴ atoms ÷ 6.02 × 10²³
no. of moles = 0.98 × 10¹
no. of moles = 9.8moles
Therefore, there are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.
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What is the molarity of a solution with 58.9 g of glucose (molar mass: 180.16 g/mol) dissolved in water to a total volume of 450.0 mL
Answer:
Molarity of solution = 0.727M
Explanation:
Molarity of solution is defined as moles solute per Liter of solution. For the posted problem use M = n/V where n = moles of solute and V = Liters of solution. That is ...
n = 58.9g/180.16g·mole⁻¹ = 0.327 mole (3 sig. figs.)
V = 450.0ml/1000ml·L⁻¹ = 0.450L (3 sig. figs.)
∴ Molarity = n/V = 0.327mole/0.450L = 0.727mol/L = 0.727M
Select which of the following are renewable resources. Select all that apply.
Question 6 options:
Sunlight
Wind
Oil
Coal
Plants
Explanation:
Sunlight
Wind
Plants
Those option are an example
of a renewable source
Which element of the third period had the highest first ionization energy?
•silicon
•sulfur
•argon
•sodium
Answer:
C.) Argon
Explanation:
This is because ionisation energy increases as we move from left to right in a period. Argon presents in the right most column and Argon is a novel gas and has 8 electrons in outermost orbital. So, it is highly stable. I hope I helped! ^-^
can guys help me to answer it
It is true
I hope it's help u
Please show work when you’re doing this! Thank you
how many grams of mgcl2 are contained in 500 grams of a 1.0% solution
The mass percentage of the solution that we have in the question is 5 g.
What is percent w/w concentration?Percent w/w (weight/weight) concentration is a way to express the concentration of a solute in a solution as a percentage by mass. It represents the mass of the solute in grams per 100 grams of the solution.
Percent w/w concentration is commonly used in industries such as pharmaceuticals, food and beverage, and cosmetics to measure the concentration of active ingredients or additives in their products.
We know that;
%w/w = weight of the solute/Weight of the solution
Let the weight of the solute be x
1 = x/500 * 100/1
1 = 100x/500
500 = 100x
x = 5 g
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4 FeS+ 7022 Fe2O3 + 4S02
How many grams sulfur dioxide are
produced if 124 grams of
iron(II) sulfide are used?
Taking into account the reaction stoichiometry, 90.33 grams of SO₂ are formed when 124 grams of iron(II) sulfide are used.
Reaction stoichiometryIn first place, the balanced reaction is:
4 FeS + 7 O₂ → 2 Fe₂O₃ + 4 SO₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
FeS: 4 moles O₂: 7 moles Fe₂O₃: 2 moles SO₂: 4 molesThe molar mass of the compounds is:
FeS: 87.85 g/moleO₂: 32 g/moleFe₂O₃: 159.7 g/moleSO₂: 64 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
FeS: 4 moles ×87.85 g/mole= 351.4 gramsO₂: 7 moles ×32 g/mole= 224 gramsFe₂O₃: 2 moles ×159.7 g/mole= 319.4 gramsSO₂: 4 moles ×64 g/mole= 256 gramsMass of sulfur dioxide formedThe following rule of three can be applied: if by reaction stoichiometry 351.4 grams of FeS form 256 grams of SO₂, 124 grams of FeS form how much mass of SO₂?
[tex]mass of SO_{2} =\frac{124 grams of FeSx256 grams ofSO_{2}}{351.4 grams of FeS}[/tex]
mass of SO₂= 90.33 grams
Then, 90.33 grams of SO₂ are formed when 124 grams of iron(II) sulfide are used.
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how many electrons are in the outermost shell of oxygen
Answer:
6
Explanation:
electronic configuration is 2,6.
From electronic configuration we can see that oxygen have 6 electrons in its outermost shell.
How many ug of nickel (Ni) are required to make 25.00 nanoliters of a 1.25 mol/L solution? Be sure to report your answer to the correct number of significant figures.
volume of Ni = 25 nL = 25 x 10⁻⁹ L
mol Ni = 25 x 10⁻⁹ L x 1.25 mol/L = 3.125 x 10⁻⁸
mass = mol x Ar Ni
mass = 3.125 x 10⁻⁸ x 59 g/mol
mass = 1.84 x 10⁻⁶ g = 1.84 μg
Answer:
Explanation:
"25.00 nanoliters of a 1.25 mol/L solution" contains
25.00*10^(-9) L * 1.25 mol/L
= 31.25*10^(-9) mol of Ni
Molar mass of Ni is 58.69 g/mol
So 31.25*10^(-9) mol of Ni
= 31.25*10^(-9) * 58.69 g
= 1834.06*10(-9) g
= 1.834*10(-6) g
= 1.834 ug of Ni
please help me, or just tell me what laws they are (Boyle's law, Charles
Law, Avogadro's Law, Ideal
Gas Law, or Combined Gas Law) please thank you!
Answer:
Boyle's law states that the volume of a fixed mass of agass at constant temperature is inversely proportional to its pressure
what is name of:
1.Ca(H2PO4)2,
2.Fe(HSO4)2,
3.(CaOH)2SO4
4.Al(OH)Cl2
1. Calcium hydrogen phosphate
2. Iron(II) Hydrogen Sulfate
3. Calcium hydroxide
4. Aluminum chloride hydroxide
Na + __CI2 → _NaCl
How many moles of Cl2 needed to make 2.5 moles NaCl?
Answer:
1.25 moles
Explanation:
You have 2.5 moles of Cl on product side and you need to make that equal on the reactant side. You can see it is Cl2 so you need to half 2.5 by 2 so both sides are equal. 2.5/2=1.25
True or False Photosynthesis and Cell Respiration are opposite reactions. Photosynthesis provides the molecules needed for cell
respiration, and cell respiration provides the molecules need for photosynthesis.
O False
True
Answer:
The answer is True.
1)
If I have 9 moles of a gas at a pressure of 1 atm and a volume of 12 liters, what is
the temperature?
ideal gas
PV=nRT
T = PV/nR
T = 1 x 12/9 x 0.08205
T = 16.25 K
What mass of H2 is needed to react with 8.75g oh O2 according to the following equation: O2(g)+H2(g)-->H2O(g)?
Answer:
1 mole Oxygen = 2 mole hydrogen0.21 mol oxygen = 0.54 mol hydrogenMass of hydrogen = moles molecularweight
Mass of hydrogen = 0.54 2 Mass of hydrogen = 1.08 grams.
Thus, for reacting with 8.75 grams of oxygen,
1.08 grams of hydrogen is required.
Explanation:
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what happens to matter when a wave travels through it?
is a disturbance which travel through a medium that enables energy to be transferred from one point to another
what reaction occurs when bleach mixed with heat
Answer:
ok im eating chips :)
Explanation:
The fumes being released are almost certainly chlorine, which as you have observed, is quite hazardous. Bleach usually contains strong warnings not to mix with any other cleaning chemical, as some of them will tend to rapidly decompose its active ingredient and release a lot of gaseous chlorine
A 5.0 L vessel has a total pressure of 5.0 atm. The partial pressure of the gases in the
vessel are 1.2 atm N2, 2.0 atm F2, and 1.0 atm H2 at 273 K.
What is the partial pressure of the remaining gas that was not measured?
10.5 atm
0.5 atm
2.0 atm
0.8 atm
The partial pressure of the remaining gas that was not measured is 0.8 atm.
Partial pressure of gasesThis is the individual pressure exacted by each gas in the containing vessel. This partial pressure of individual gases make up the total pressure.
Pt = P₁ + P₂ + P₃ + P₄
5 = 1.2 + 2 + 1 + P₄
5 = 4.2 + P₄
P₄ = 5 - 4.2
P₄ = 0.8 atm
Thus, the partial pressure of the remaining gas that was not measured is 0.8 atm.
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What is the difference between physics and chemistry laboratory (4)
Answer:A fundamental difference is that physics is more focused to finding the universal laws of general processes, whereas chemistry focuses more on details and specific phenomena, such as what is the boiling point of this substance and why.
Explanation: hope it help
Sucrose (C₁₂H₂₂O₁₁) is combusted in air according to the following reaction:
C₁₂H₂₂O₁₁(s) + O₂(g) → CO₂(g) + H₂O(l)
How many grams of carbon dioxide would be produced by the complete combustion of 2.05 moles of sucrose in the presence of excess oxygen?
The mass of carbon dioxide that would be produced by the complete combustion of 2.05 moles of sucrose is 1,082.4 g.
Complete combustion of the sucroseThe complete combustion of sucrose in excess oxygen is given as follows;
C₁₂H₂₂O₁₁(s) + O₂(g) → CO₂(g) + H₂O(l)
balanced chemical equation is below;
C₁₂H₂₂O₁₁(s) + 12O₂(g) → 12CO₂(g) + 11H₂O(l)
from the reaction above;
1 mole of sucrose ----------> 12 mole of carbon dioxide
2.05 mole of sucrose ------> ?
= 2.05 x 12
= 24.6 moles
Mass of carbon dioxide1 mole of carbon dioxide = 44 g/mole
24.6 moles = ?
= 24.6 x 44
= 1,082.4 g
Thus, the mass of carbon dioxide that would be produced by the complete combustion of 2.05 moles of sucrose is 1,082.4 g.
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17. Calculate the mass of hydrogen formed when 24 g of aluminum reacts with excess hydrochloric acid
according to the balanced equation below.***
2A1 + 6HCI - 2 AlCl3 + 3 H2
a. 1.5 g
b.2.7 g
c. 3.4g
d. 6.6 g
Answer:
c) 2.7 g
Explanation:
The first step is to find the moles of aluminum that you're reacting. To do this, you would do
24 g × molar mass of aluminum = 24 g ÷ 26.982 g/mol = 0.8895 mol Al
Then by the balanced equation, you know that every 2 moles of Al will produce 3 moles of H2. This implies that 0.8895 × (3/2) = 1.334 moles of H2 will be produced
Lastly to find the mass of H2 produced, multiply the moles of H2 produced by the molar mass of H2
1.334 mol × (2 × 1.008 g/mol) = 2.69 g ≈ 2.7 g
What word is the best description for world population growth over the past 200 years?
Question 1 options:
Arithmetic
Logarithmic
Experimental
Exponential
Answer:
Exponential
Explanation:
Exponential means of an increase or becoming more and more rapid
Why did the colors in the Wells A1 and A3 change a second time in Procedure Steps 7 and 8? Was this because of reversible reactions?
Answer:
yes is it is because of the chemical reciation
Explanation:
m
Answer:
Yes this was because of reversable reactions, they added more drops of HCI and KOH which is the steps before they had added less.
Explanation:
An electrolytic cell is set up to plate Zr(s) from a solution containing Zr4 (aq). A current of 7.92 amps is run through this solution for 6.16 hours. The mass of Zr(s) plated out during this process is
The mass of Zr deposited in the process is 41.4 g.
What is electrolytic cell?An electrolytic cell is a chemical cell which produces electrical energy by non-spontaneous chemical processes.
From the question;
Zr^4+(aq) + 4e ------> Zr(s)
We know that;
91 g of Zr is deposited by 4(96500) C
xg of Zr is deposited by (7.92 × 6.16 × 60 × 60) C
xg = 91 g × (7.92 × 6.16 × 60 × 60) C/4(96500) C
x g = 41.4 g
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