Answers
The correct answer is A. The sample is not a heterogeneous mixture
Explanation:
A heterogeneous mixture includes two or more materials and these are not completely integrated. Due to this, in most cases, if a heterogeneous mixture is filtered it is possible to separate its parts. This did not occur when Ben filtered the substance, which shows it is likely the substance is not a heterogeneous mixture. Moreover, a heterogeneous mixture does not show uniformity in terms of appearance or properties, which shows this definitely not heterogenous and Ben can safely conclude this.
Related Questions
Processes are always spontaneous when ________ ( H and S refer to the system).
Answers
Answer:
Explanation:
A spontaneous chemical process is one in which product formation is favoured under the specified conditions. A spontaneous process yields the product without an external input of energy.
A spontaneous reaction will always occur when ∆H is negative and ∆S is positive. These are the signs of enthalpy and and entropy change that gives rise to a spontaneous chemical process at all temperatures. Recall that a spontaneous process is one in which ∆G<0.
A hybrid car holds 32 gallons of gas in its tank. If it travels from San Diego to Seattle in three tanks of gas, and gas costs $3.29 per gallon, about how much did the trip cost? Report your answer with three significant figures.
Answers
3 tanks of gas->32*3->96 gallons in total.
96*3.29->315.84
3 sig. figs. -> $315
Calculate the energy change when an electron moves from n=5 to n=7. Explain/show work please.
Answers
Answer: E = 1.55 ⋅ 10 − 19 J
Explanation:
The energy transition will be equal to 1.55 ⋅ 10 − 1 J .
So, you know your energy levels to be n = 5 and n = 3. Rydberg's equation will allow you calculate the wavelength of the photon emitted by the electron during this transition
1 λ = R ⋅ ( 1 n 2 final − 1 n 2 initial ) , where λ - the wavelength of the emitted photon; R
- Rydberg's constant - 1.0974 ⋅ 10 7 m − 1 ; n final - the final energy level - in your case equal to 3; n initial - the initial energy level - in your case equal to 5. So, you've got all you need to solve for λ , so 1 λ =
1.0974 ⋅10 7 m − 1 ⋅ (.... −152
)
1
λ
=
0.07804
⋅
10
7
m
−
1
⇒
λ
=
1.28
⋅
10
−
6
m
Since
E
=
h
c
λ
, to calculate for the energy of this transition you'll have to multiply Rydberg's equation by
h
⋅
c
, where
h
- Planck's constant -
6.626
⋅
10
−
34
J
⋅
s
c
- the speed of light -
299,792,458 m/s
So, the transition energy for your particular transition (which is part of the Paschen Series) is
E
=
6.626
⋅
10
−
34
J
⋅
s
⋅
299,792,458
m/s
1.28
⋅
10
−
6
m
E
=
1.55
⋅
10
−
19
J
1. Isotonic saline requires a concentration of 0.85% NaCl. How much solid NaCl must be weighed out on the balance to prepare a bottle full containing 3500 ml?
Answers
Given :
Concentration of NaCl , [tex]c=0.85 \%[/tex] .
To Find :
Th amount of solid NaCl must be weighed out on the balance to prepare a bottle full containing 3500 ml .
Solution :
Concentration of NaCl is 0.85 % .
It means , 0.85 gm of NaCl in 100 ml of water .
So , amount of solid NaCl required to prepare 3500 ml solution is :
[tex]x=\dfrac{3500\times 0.85}{100}\ gm\\\\x=29.75\ gm[/tex]
Therefore , amount of solid NaCl required is 29.75 gm .
Hence , this is the required solution .
Cobalt has the chemical symbol Co and the atomic number 27. How many protons, neutrons, and electrons would be found in an atom of cobalt-58?
Answers
Answer:
COBALT
Explanation:
CO BALT COBALT
How many particulars are present in 2 moles of water molecules?
Answers
Answer:
4 mole hydrozen and 2 mole oxyzen
Explanation:
Indicate the direction of polarity of each of the covalent bonds by placing the appropriate delta notation next to each end of the bond. C-O, O-CL, O-F, C-N, C-L, S-H, S-CL
Answers
Answer:
C→O, O→Cl, O→F, C→N, C←Li, S ←H, S→Cl
Explanation:
The general convention for indicating polarity in molecules is that of showing the direction of polarity from the positive to the negative part of the bond. This is indicated in the answer by arrows that show the direction of the dipole.
The negative end of the dipole must be the more electronegative element while the positive end of the dipole is the less electronegative element, hence the answer shown above.
The delta notation, indicating the polarity of for the presented covalent bonds are:
δ+ C-O δ-δ- O-Cl δ+δ+ O-F δ-δ+ C-N δ-δ+ C-Cl δ-δ- S-H δ+δ+ S-Cl δ-Polar bonds are those in which atoms have different electronegativities.
The delta notation is used to indicate the direction of the polarity.
The atom with the greater electronegativity acquires a partial negative charge (goes with the symbol δ-), while the atom with the lesser electronegativity acquires a partial positive charge (goes with the symbol δ+).
Let's consider the following elements with their electronegativities.
C (2.5)O (3.5)Cl (3.0)F (4.0)N (3.0)S (2.5)H (2.1)The delta notation for the presented bonds are:
δ+ C-O δ-δ- O-Cl δ+δ+ O-F δ-δ+ C-N δ-δ+ C-Cl δ-δ- S-H δ+δ+ S-Cl δ-Learn more: https://brainly.com/question/2734316
What are ions exactly?
Are atoms with an incomplete outer valence shell called ions?
Answers
Answer:
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. ... When an atom is attracted to another atom because it has an unequal number of electrons and protons, the atom is called an ION.
Explanation:
what is neutralisation reaction?
Answers
Answer:
In chemistry, neutralization or neutralisation (see spelling differences) is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.
Answer:
A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7
Explanation:
How many grams are in 160 pounds?
Answers
Answer:
72574.8
Explanation:
Thats what google says
Draw two five carbon rings that share an atom.
Answers
Draw your electron rings. The circle with the "C" is a representative nucleus, so now you'll need to indicate the electron orbitals. The number of rings you need is to tied to the number of electrons you have. Carbon has 6 electrons. Since each ring has a maximum number of electrons that can be pictured, you'll have to do some math. The first ring can have a maximum of 2 electrons, the second ring a maximum of 8, the third ring a maximum of 18, etc. Carbon has 6 electrons, so you'll need to draw two concentric rings.
Draw your electrons. You can do this a couple different ways. Some people just draw circles on the rings and fill them in. In this case, you would draw 2 on the first ring and 5 on the second ring. The best way to draw electrons is to draw them as circles with minus signs inside. This indicates not only that they are electrons, but helps remind the viewer that electrons contain a negative charge.
What is the relationship between grams and cm³?
Answers
Answer:
1 gram
Explanation:
1 gram= weight of 1 cubic centimeter of pure water at temperature 4°C = 1000 milligrams = 0.001 kilogram
Categorize each molecule according to its hydrogen-bonding characteristics.a. CH3OCH3b. CH3CH2CH3c. CH3CH2NH2d. H2Oe. CH3OH
Answers
Answer:
H2O > CH3OH > CH3CH2NH2 > CH3OCH3 > CH3CH2CH3
Explanation:
Hydrogen bonding exists in molecules in which hydrogen is bonded to a highly electronegative element such as fluorine, chlorine, oxygen, sulphur, nitrogen etc.
Water has the highest degree of hydrogen bonding among the listed substances hence its very high boiling point, stemming from intermolecular hydrogen bonding. CH3CH2NH2 has a lesser degree of hydrogen bonding because nitrogen is less electronegative than oxygen.
Alcohols show significant hydrogen bonding in solution, the same applied to amines. However, ethers do not form hydrogen bonds with each other but they can form hydrogen bonds with other molecules such as alcohols and amines. Alkanes do not form hydrogen bonds at all.
The sun supplies about 1.0 kilowatt of energy for each square meter of surface area (1.0 kW/m^2 where a watt = 1 kJ/s) Plants produce the equivalent of about 0.20g of sucrose (C_12H_22O_11) per hour per square meter. Assuming that the sucrose is produced as follows, calculate the percentage of sunlight used to produce sucrose12CO2 (g) + 11H2O (I) --> C12H22O11 + 12O2(g) deltaH = 5645 kJ
Answers
Answer:
0.092 %
Explanation:
The equation of the reaction can be computed as :
[tex]12CO_2_{(g)} + 11H_2O_{(l)} \to C_{12}H_{22}O_{11} + 12O_{2_(g)}[/tex]
[tex]\Delta H = 5645 \ kJ[/tex]
recall that; the number of moles = [tex]\dfrac{mass}{molar \ mass}[/tex]
By applying the method of enthalpy of combustion for sucrose at the same time changing the time from hours to seconds, we can determine the total energy output.
i.e
[tex]=\dfrac{0.20g \ of \ sucrose }{m^2 \ 3600 \ s}\times \dfrac{1 \ mol}{342.34 \ g}\times 5.645 kJ/mol[/tex]
[tex]= 9.16 \times 10^{-4} \ kJ/m^2 s[/tex]
Given that the sun supplies about 1.0 kilowatt, to KJ/m² s, we have:
[tex]1.0 \dfrac{kW}{m^2 }= 1.0 \dfrac{kJ}{m^2 s}[/tex]
Finally, the percentage of sunlight used to produce sucrose :
= [tex]\dfrac{9.16 \times 10^{-4} \ kJ/m^2 \ s}{1.0 \ kJ/m^2 . s} \times 100\%[/tex]
= 0.092 %
What is the pH of 500 mL of water after the addition of 1 mL of 2M NaOH?
Answers
Answer:
pH = 11.60
Explanation:
When we add a base, we are increasing [OH⁻], so the pH will be totally basic.
pH of water = 7
Basic pH > 7
We are adding 2 M . 1 mL = 2 mmoles
2 mmoles of OH⁻ are contained in 501 mL of total volume.
[OH⁻] = 2 mmol / 501 mL = 3.99×10⁻³ M
- log 3.99×10⁻³ M = 2.39 → pOH
pH = 14 - pOH → 11.61
Water equilibrium
2H₂O ⇄ H₃O⁺ + OH⁻ Kw = 1×10⁻¹⁴
NaOH → Na⁺ + OH⁻
which of the following tools can be used to measure mass? A.a graduated cylinder B. a triple beam balance C. a mercury thermometer D. a bathroom scale
Answers
Answer:
triple beam balance
Explanation:
The tool that can be used to measure mass is a triple beam balance. Therefore, the correct option is option B.
A graduated cylinder is used to determine a liquid's volume. A mercury thermometer is used to measure temperature. Weight is calculated on a bathroom scale and is a force rather than a mass. A typical scientific tool for calculating an object's mass is a triple beam balance.
It is composed of three beams with moveable weights that enable precise mass balancing and a pan on one end where the thing to be measured is placed. By comparing the placement of the weights on the beams to the appropriate scale, the mass of the object can be ascertained.
Therefore, the correct option is option B.
To know more about mass, here:
https://brainly.com/question/11954533
#SPJ6
There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. In the first step, calcium carbide and water react to form acetylene and calcium hydroxide:
CaC2(s) + 2H2O(l) → C2H2(g) + Ca(OH)2(s)ΔH = −414kJ
In the second step, acetylene, carbon dioxide and water react to form acrylic acid:
6C2H2(g) + 3CO2(g) + 4H2O(g) → 5CH2CHCO2H(g)ΔH = 132kJ
Calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water, and carbon dioxide from these reactions. Round your answer to the nearest kJ.
Answers
Answer:
ΔH = -470.4kJ
Explanation:
It is possible to sum 2 or more reactions to obtain the ΔH of the reaction you want to study (Hess's law). Using the reactions:
1. CaC2(s) + 2H2O(l) → C2H2(g) + Ca(OH)2(s)ΔH = −414kJ
2. 6C2H2(g) + 3CO2(g) + 4H2O(g) → 5CH2CHCO2H(g)ΔH = 132kJ
6 times the reaction 1.
6CaC2(s) + 12H2O(l) → 6C2H2(g) + 6Ca(OH)2(s)ΔH = −414kJ*6 = -2484kJ
This reaction + 2:
6CaC2(s) + 3CO2(g) + 16H2O(l) → + 6Ca(OH)2(s) + 5CH2CHCO2H(g) ΔH = -2484kJ + 132kJ = -2352kJ
As we want to calculate the net change enthalpy in the formation of just 1 mole of acrylic acid we need to divide this last reaction in 5:
6/5CaC2(s) + 3/5CO2(g) + 16/5H2O(l) → + 6/5Ca(OH)2(s) + CH2CHCO2H(g) ΔH = -2352kJ / 5
ΔH = -470.4kJWhich of the following amino acid functional groups will influence the pKa of an amino acid residue the least if it is on an adjacent residue?A. -OH.B. -NH3.C. -CH3.D. -COOH.
Answers
Answer:
C. -CH3
Explanation:
The pKa (acid dissociation constant) of an amino acid residue is primarily influenced by the functional groups attached to the adjacent end of the amino acid chain. The acidity of a functional group depends on how electronegative the functional group is. In the given functional groups' list, the functional group with the least influence on the pKa of the amino acid is the alkyl substituent (-CH3), because they have the least electron-withdrawing capacity.
4. In a chemical process, you need to force a compound to bond with a halogen, causing it to lose hydrogen. Which type of reaction do
you need to perform?
A. Halogenation
B. Hydrolysis
C. Reduction
D. Ammoniation
Answers
Answer:
Halogenation
Explanation:
Halogenation is a type of substitution reaction in which a hydrogen atom is replaced by a halogen atom in a molecule.
The molecule looses its hydrogen atom as the halogen is introduced into the molecule. This sort of reaction is very common in organic chemistry. Many hydrocarbons can be halogenated in the presence of light.
In order to calculate how many neutrons are in an atom, you must subtract the mass number from the number of protons? Neutrons = Mass # - Protons Question 6 options: True False
Answers
Answer:
True.
Explanation:
The mass number of an atom can be calculated using no of protons and the no of neutrons.
Mass number = no of protons + no of neutrons
We can rearrange the above formula to find the no of neutrons as follows :
no of neutrons = Mass number - no of protons
or
Neutrons = Mass - protons.
Hence, the given statement is true.
what is the name of the salt with the structure K2S
Answers
when are larger atoms least likely to be reactive
Answers
Answer:
when they have eight valence electrons.
Explanation:
When atoms do not have a full valence shell, the atoms are more likely to react with other and vice versa.
Answer:
When they have a full shell of electrons
Explanation:
and or eight valence electrons
why is the pull of gravity more at the poles than at than at the equator.
Answers
Answer:
Why the gravitational force is greater near the poles and less at equator?
Gravitational force of Earth is minimum at equator because the centrifugal force at the equator is maximum.
Centrifugal force is an outward force exerted on a body revolving in a circular path, to mantain its state of motion.
Explanation:
Here Earth revolves around its axis and the same forces act on it to enable its revolution.
Gravitational force at the equator is less because Centrifugal force, which is also acting at the equator cancels out the Gravitational force to an extent. Whereas at poles, there is no such effect of centrifugal force because earth is sphere (bulged at center; flat at poles )and hence gravitational force is maximum at poles.
The other reason is distance from any place on equator to centre of earth is more than at poles. Because Earth is bulged at centre and flat at poles. Since Gravitational force is given by
F= GMm/ r^2 ; r is the distance between two bodies.
Formulate a hypothesis about the stoichiometry of the reaction between NaCl and AgNO3.
Answers
Answer:
AgCl + NaNO3 would be the products of the reaction between sodium chloride and silver nitrate.
The stoichiometry of this reaction is written below, and it is because for this reaction to be fulfilled the products have to be in equilibrium with the reactants, since the mass in the reaction is conserved and must be balanced in the amount of molecules that they react to each other.
Explanation:
NaCl + AgNO3 -------------- AgCl + NaNO3
If a dog has a mass of 21.5kg, what is his mass in the following units?
What is the dogs mass in gram?
What is the dog mass in mg?
Answers
Answer: 21.5kg in grams is 21,500 grams
21.5kg in mg is 215,000,00
Explanation:
2-methyl-2-pentene Spell out the full name of the compound.
Answers
Answer:
METHYL PENTENE or 2-METHYL PENT-2-ENE
Explanation:
The number 2 carbon carries the methyl group and the double bone is on the 2 carbon as well.
The chemical structure of the compound has been attached.
I hope this is what you were looking for.
Which of the following is a valid conversion factor:
10m/1dm
1mL/100L
100cg/1g
1cm^3/1L
Answers
1 gram = 100 centigrams (centi means hundred).
If a 250mL beaker weighs 13.473g and the same beaker plus 2.2 mL of water weighs 15.346g. How much does the 2.2 mL of water, alone, weigh? Show your work for the calculation. Be sure to use significant figures.
Answers
Given :
A 250 ml beaker weighs 13.473 g .
The same beaker plus 2.2 ml of water weighs 15.346 g.
To Find :
How much does the 2.2 ml of water, alone, weigh .
Solution :
Now, mass of water is given by :
[tex]\text{Mass of water alone = Total mass - Mass of beaker alone}\\\\Mass =15.346-13.473\ g\\\\Mass =1.873\ g[/tex]
Therefore , mass of 2.2 ml of water alone is 1.873 g .
Hence , this is the required solution .
Why does the lack of snow in the mountains make drought cycles worse
Answers
Answer:
lack of snow in the mountains makes drought cycles worse because mountains are a natural part of the water cycle.
Explanation:
Mountains play a critical part In the water cycle by capturing moisture in the air and it precipitates as snow and when it does this the snow will melt in the warmer seasons and flow down stream then following the rest of the water cycle if we didn't have this then the streams would run less and it would greatly disrupt the water cycle.
The mass percentage of hydrochloric acid within a solution is 28.00%28.00% . Given that the density of this solution is 1.1411.141 g/mL, find the molarity of the solution.
Answers
Answer:
8.76M
Explanation:
Given that
Mass from the density = 1141g
According to the given situation the computation of molarity of the solution is shown below:-
we will took HCL solution which is 1000mL
HCl = 28% by mass
So,
Mass of HCl in 1-litre solution is
[tex]= \frac{28}{100} \times 1141[/tex]
Which gives the result of molar mass HCI is
= 319.48g /mol
Now,
Molarity is
[tex]= \frac{319.48}{36.45}[/tex]
Which gives results of molarity is
= 8.76M