Answer:
c. water is added to coffe until the solution becomes clear
Answer:
c
Explanation:
Water is added to coffee until the solution becomes
clear.
7. A solution containing 90grams of KNO3 per 100. grams of H2O at
50.°C is considered to be
(1) dilute and unsaturated
(2) dilute and supersaturated
(3) concentrated and unsaturated
(4) concentrated and supersaturated
Answer:
(4) concentrated and supersaturated
Explanation:
At 50.°C, 90g of KNO3 lies above the solubility curve [on the Regents Reference Table G]. This indicates that the solution is supersaturated, meaning it contains more solute than will naturally dissolve, and was formed when a saturated solution cooled. Furthermore, the percent concentration of this solution is 90% KNO3 making this solution concentrated. This can be calculated using the formula for mass percent concentration.
Percent Mass = Mass of Solute (g) x 100
Mass of Solution (g)
Given solution is considered as concentrated and supersaturated.
What is supersaturated solution?Supersaturated solutions are those solutions in which no. of dissolved solute is more and added to the saturated solution of that solute.
In the question given that,
Weight of solute or KNO₃ = 90 g
Weight of solvent or water = 100 g
Temperature = 50°C
According to the solubility curve, given solution is supersaturated because it contains excess amount of solute and it is concentrated because solute in dissolve in the saturated solution at nearly high temperature and after cooling we get the consistent solution.
Hence, option (4) is correct i.e. given solution is concentrated and supersaturated.
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A student sets up a box with a flashlight that shines on a mirror located at position X. Other possible locations for objects in the box are labeled A-E.
How can the student place objects in the box to have all the light from the flashlight shine back on the flashlight?
Answer:
If all the objects are placed at the same angle.
Explanation:
If all the objects are placed at the same angle so all the light from the flashlight shine comes back to the flashlight. If the A object is placed at the specific location at which the mirror X reflects the light after hitting it, then the other E object is placed at the location where the light comes after reflecting the A object then the light comes back to the flashlight if the angle between objects placement is right.
Answer:
d
Explanation:
the third period element with the largest number of electrons
Answer:
Na
Explanation:
Methanol has the formula of CH3OH and can be produced by the reaction of carbon monoxide with hydrogen gas. CO + 2 H2 === CH3OH + heat Using the above chemical reaction, determine how each of the following actions would affect the equilibrium of the system. a. heating the mixture b. adding an excess of carbon monoxide c. removing the methanol as it is formed d. adding a substance that reacts with carbon monoxide
Answer:
See explanation below
Explanation:
Let's answer this by parts.
a) As the reaction is naturally exothermic (Exerts heat), increasing temperature means that the reaction will move forward the direction where its absorbing heat
, so the equilibrium will be favored to the reactant side.
b) In this case, the addition of CO, which is a reactant will favor the reaction to the product side. This is because putting more quantity in the reactants will cause that the equilibrium constant K, increase it's innitial value, and this favors the product side.
c) In this case, it happens something similar to case b. This will cause that the reaction will have to work to cover the loss of methanol, therefore, equilibrium will move to the product side too.
d) In this case, we are adding another substance that reacts with CO, so it means that the other reactant is being removed, therefore, the reaction will work to cover this loss but also to cover the adding of the new substance, causing that the K decrease it's value, so equilibrium will be favored to the reactants side.
Hope this helps
Starting with 5.00 g barium chloride n hydrate yields 4.26 g of anhydrous barium chloride after heating. Determine the integer n.
Answer:
BaCl₂·(H₂O)₂
Explanation:
The reaction that takes place is:
BaCl₂·(H₂O)ₙ → BaCl₂ + nH₂OThe information given by the problem tells us that 5.00 g of reactant were consumed. Of those 5.00 g, 4.26 g were converted into BaCl₂, this means that the other 0.74 g were converted into water.
We convert 0.74 g of water into moles, using its molar mass:
0.74 g H₂O ÷ 18 g/mol = 0.041 mol H₂OThen we convert 4.26 g of BaCl₂ into moles:
4.26 g BaCl₂ ÷ 208.23 g/mol = 0.0204 mol BaCl₂We can write these results as (BaCl₂)₀.₀₂·(H₂O)₀.₀₄. We multiply those coefficients by 50 in order to make them integers, and we're left with:
BaCl₂·(H₂O)₂What might an organism do if there is a change to it's ecosystem?
A. Move
B. Die
C. Survive
D. All of these
Answer:
I would say C) Survive
An organism will survive, move or die if there is a change to its ecosystem. Therefore, option (D) is correct.
What is an ecosystem?An ecosystem contains all the organisms and the physical environment with which they interact. The biotic and abiotic components are connected together through energy flows and nutrient cycles. Energy injects into the system through photosynthesis into plant tissue.
Animals play an important role by feeding the plants in the movement of matter and energy through the system. Decomposers release carbon back into the atmosphere and facilitate nutrient cycling by breaking down dead organic matter.
External and internal factors control the ecosystem. External factors such as climate control the overall structure of an ecosystem but are not influenced by the ecosystem. Internal factors are controlled such as decomposition, shading, root competition, disturbance, succession, and the types of species present.
The change in the ecosystem makes the organism to adapt the environment in order to survive, move to a new place or die.
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Solid nickel is added to aqueous iron nitrate. Using the metal activity series, which chemical equation reflects this reaction and its outcome? Question 5 options: A) 3Ni(NO3)2 (aq) + 2Fe (s) → NR B) Ni (s) + Fe(NO3)3 (aq) → NR C) 3Ni(NO3)2 (aq) + 2Fe (s) → 3Ni (s) + 2Fe(NO3)3 (aq) D) 3Ni (s) + 2Fe(NO3)3 (aq) → 3Ni(NO3)2 (aq) + 2Fe (s)
Answer:
3 Ni + Fe(NO₃)₃ --> 3 Ni(NO₃) + Fe
Explanation:
In this question, the reactants are;
Solid Nickel and Iron nitrate. This is represented as;
Ni and Fe(NO3)3
The equation of the reaction is given as;
3 Ni + Fe(NO₃)₃ --> 3 Ni(NO₃) + Fe
The option that closely matches this is;
Option D. (Although the reaction is not balanced)
An FCC iron-carbon alloy initially containing 0.20 wt% C is carburized at an elevated temperature and in an atmosphere wherein the surface carbon concentration is maintained at 1.0 wt%. If after 48 h the concentration of carbon is 0.35 wt% at a position 3.9 mm below the surface, determine the temperature at which the treatment was carried out. You will need to use data in the two tables below to solve this problem.
Answer:
Hello the table required is missing attached below is the missing table
Answer : 1299.05 k
Explanation:
Given data :
concentration of carbon ( Cx ) at a position 3.9mm below surface = 0.35
concentration of carbon ( Co ) = 0.20
surface carbon ( Cs ) = 1
Determine the temperature at which the treatment was carried out
first we will determine the value of Z in the table attached
given that the value of erf ( Z ) for Z = 0.8125 from the table
= [tex]\frac{Z- 0.9}{0.95-0.9} = \frac{0.8125-0.797}{0.8209-0.797}[/tex]
make Z subject of the equation
Z = 0.932
next calculate the diffusion coefficient using the relation below
Z = [tex]\frac{x}{2\sqrt{Dt} }[/tex] ----- ( 1 ) where ; z = 0.932 , x = 3.9 mm , t = 48h
0.932 =
x = 3.9 mm = 0.0039 m
t = 48 h = ( 48 *60* 60 ) = 172800 secs
Insert values into equation 2
0.932 = [tex]\frac{0.0039}{2\sqrt{D * 172800} }[/tex]
[tex]\sqrt{D*172800}[/tex] = (0.0039 / 0.932 ) / 2
172800 * D =( 0.0021 )^2
therefore D = 2.55 * 10^-11 m^2/s
Finally calculate the temperature at which the treatment was carried out
D = [tex]Do exp(\frac{-Qd}{RT} )[/tex] ----- ( 3 )
D = 2.55 * 10^-11 m^2/s ,
Do = 2.3*10^-5 m^2/s ( gotten from Diffusion data table )
Qd = 148000 J/mol ( gotten from Diffusion data table )
R = 8.31 J/mol k ( gotten from Diffusion data table )
back to equation 3
D / Do = exp ( -17810 / T )
1.11 * 10^-6 = exp ( -17810 / T )
therefore T = -17810 / ln( 1.11 * 10^-6 )
= - 17810 / -13.71 = 1299.05 k
which one of the following are pure substances : water,salt water,copper,brass,air,oxygen
Answer:
Copper, Water, and Oxygen
Explanation:
Because they are compounds and compounds are pure substances <3
Answer: copper
Explanation: because all of the atoms that make up copper are copper i.e its not a compound or mixture. not made od molecules
The element sulfur (S) is most likely to form covalent bonds with the element
helium (He).
magnesium (Mg).
zinc (Zn).
oxygen (O).
The element sulfur (S) is most likely to form covalent bonds with the element oxygen. Thus, the correct option for this question is D.
What do you mean by Covalent bonds?Covalent bonds may be defined as a type of chemical bond that significantly involves the mutual sharing of electrons in order to form electron pairs between atoms. This pairing of electrons is simultaneously attracted by the two atomic nuclei.
Sulfur is categorized into the category of nonmetal in group 6A, and therefore it has 6 valence electrons. In order to obey the octet rule, it needs to gain 2 electrons. It can do this by forming 2 single covalent bonds.
The sulfur atom subsequently shares four valence electrons with two oxygen atoms as two covalent double bonds, and shares its remaining two electrons with two oxygen atoms, forming two covalent single bonds.
Therefore, the element sulfur (S) is most likely to form covalent bonds with the element oxygen. Thus, the correct option for this question is D.
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Question 2 2 points)
Which of the atoms shown has an atomic number of 42
1
2
4
7
Answer:
4 is the answer
Explanation:
i am not sure for this question
100
Continue reflecting on managing the effects of tropical cyclones by a
the phrases below:
I have learned that the Philippine Area of Responsibility
The Philippine Atmospheric, Geophysical, and Astronomical Services Administration
The Philippines is prone to typhoons because
You can trace the path of typhoons using
You will then understand that landmasses and bodies of
water affect the intensity of typhoons causing it to increase when
and decrease when
We should stay informed about the weather. Public Storm Warning Signals indicate
The higher the PSWS, the
the damage felt. Hazards that may
accompany tropical cyclones are
But tropical cyclones also have benefits, such as
Great work! Now that you know more about the effect of typhoons, you can
ssen the damages by knowing what to do. Answer the next activity, to eva
nowledge on precautionary measures to lessen the risk brought about by
10
Answer:
?????
Explanation:
...? what...?
03
A force of 20 N acts upon a 5 kg block. Calculate the acceleration of the object.
How does the conflict in this passage develop a theme?
Mrs. Linde creates a conflict by promising something she cannot give to Krogstad, which develops the theme that empty promises can destroy relationships.
Krogstad continues the conflict by choosing clearing his name over having a life with Mrs. Linde, which develops the theme that you must often choose yourself over others.
Krogstad creates a conflict by deceiving Mrs. Linde about his intentions, which develops the theme that, in love, actions speak louder than words.
Mrs. Linde resolves the conflict by committing to a new life with Krogstad, which develops the theme that new beginnings are always possible.
Answer:
The answer is option D
Explanation:
This is because Mrs. Linde resolves the conflict by committing to a new life with Krogstad, which develops the theme that new beginnings are always possible.
The conflict in this passage develops a theme, as Mrs. Linde resolves the conflict by committing to a new life with Krogstad, which develops the theme that new beginnings are always possible. Option D.
What is conflict?A conflict is defined as a battle or disagreement. A dispute over parenting techniques is an example of conflict, the two parties not seeing eye to eye.
In conclusion, The passages conflict develops the theme that new beginnings are always possible.
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why is plastic a better choice for the slide than aluminum?
Answer:
Plastic is better because it doesn't melt in the microwave but aluminum burns in the microwave
Explanation:
For the following reaction, 33.7 grams of bromine are allowed to react with 13.0 grams of chlorine gas.
bromine (g) + chlorine (g)>bromine monochloride (g)
What is the maximum amount of bromine monochloride that can be formed? __________grams
What is the FORMULA for the limiting reagent?
What amount of the excess reagent remains after the reaction is complete? __________grams
Explanation:
The reaction is given as;
Br2(g) + Cl2(g) ----> 2BrCl(g)
From the equation;
1 mol of Br2 reacts with 1 mol of Cl2
Converting the masses given to moles, using the formular;
Number of moles = Mass / Molar mass
Br2;
Number of moles = 33.7 g / 159.808 g/mol = 0.21088 mol
Cl2;
Number of moles = 13.0 g / 70.906 g/mol = 0.18334 mol
From the values;
0.18334 mol of Cl2 would react with 0.18334 mol of Br2 with an excess of 0.02754 mol of Br2
What is the maximum amount of bromine monochloride that can be formed? __________grams
1 mol of Cl2 produces 2 mol of Bromine Monochloride
0.18334 mol of Cl2 would produce x
Solving for x;
x = 0.18334 * 2 = 0.36668 mol
Converting to mass;
Mass = Number of moles * Molar mass = 0.36668 mol * 115.357 g/mol
Mass = 42.299 g
What is the FORMULA for the limiting reagent?
The limiting reagent is Cl2 as it determines the amount of product formed. The moment the reaction uses up Cl2, the reaction stops.
What amount of the excess reagent remains after the reaction is complete? __________grams
The excess reagent is Br2
The number of moles left is;
0.02754 mol of Br2
Converting to mass;
Mass = Number of moles * Molar mass = 0.02754 mol * 159.808 g/mol
Mass = 4.401 g
what is the smallest substance?
1 .mixture
2 .compound
3 .element
Gas law practice problems
LE
gas
A 3.0L sample of carbon dioxide gas at 155 kPa is injected into a 5.0 L vessel. What is the new pressure of the
gas
Answer:
93 kPa
Explanation:
Step 1: Given data
Initial volume of carbon dioxide gas (V₁): 3.0 LInitial pressure of carbon dioxide gas (P₁): 155 kPaFinal volume of carbon dioxide gas (V₂): 5.0 LFinal pressure of carbon dioxide gas (P₂): ?Step 2: Calculate the final pressure of carbon dioxide gas
If we assume carbon dioxide behaves as an ideal gas, we can calculate the final pressure of carbon dioxide gas using Boyle's law.
P₁ × V₁ = P₂ × V₂
P₂ = P₁ × V₁/V₂
P₂ = 155 kPa × 3.0 L/5.0 L = 93 kPa
Is snow organic or inorganic?
Answer:
snow is made up of a variety of mostly organic matter, including dead or dying animals and phytoplankton, protists, fecal matter, sand, and other inorganic dust.
Explanation:
I hope I helped!!
Plz mark me brainliest it would really make my day!
Answer:
I think its organic unless we are talking about this snow storm then no
& Oregonians eat about 9503 metric tons of food each day. What is this consumption rate in grams
per second?
Answer:
109988 grams per second
Explanation:
To solve this problem first we convert 9503 metric tons into grams, keeping in mind that:
1 metric ton = 1000 kg1 kg = 1000 gMeaning that:
9503 metric ton * [tex]\frac{1000kg}{1metricTon}*\frac{1000g}{1kg}[/tex] = 9503x10⁶ gThen we calculate how many seconds are there in one day:
1 day * [tex]\frac{24h}{1day} *\frac{60min}{1h} * \frac{60s}{1min}[/tex] = 86400 sFinally we calculate the consumption rate:
9503x10⁶ g / 86400 s = 109988 g/sWhat is the concentration of a Kl solution of 20.68 g of solute was dissolved in enough water to form 100. ml of solution?
Answer:
1.25M
Explanation:
1. Calculate how many moles of glycine are in a 130.0-g sample of glycine.2. Calculate the percent nitrogen by mass in glycine.
Answer:
[tex]n=1.732mol[/tex]
[tex]\% N=18.7\%[/tex]
Explanation:
Hello!
In this case, since the molecular formula of glycine is C₂H₅NO₂, we realize that the molar mass is 75.07 g/mol; thus, the moles in 130.0 g of glycine are:
[tex]n=130.0g*\frac{1mol}{75.07 g}\\\\ n=1.732mol[/tex]
Furthermore, we can notice 75.07 grams of glycine contains 14.01 grams of nitrogen; thus, the percent nitrogen turns out:
[tex]\% N=\frac{14.01}{75.07}*100\% \\\\\% N=18.7\%[/tex]
Best regards!
Consider a 0.70 M solution of HOCl. If the molarity was decreased to 0.3 M, what would happen to the percent dissociation?
Answer:
The percent dissociation would increase
Explanation:
Percent dissociation is the ratio of amount dissociated to the initial concentration.
Decreasing the concentration of the solution leads to an increase in percent dissociation.
I NEED HALPPPPPP PLEASE
Question 1 options:
instant tea
water
Question 2 options:
instant tea
water
Question 3 options:
mixture
solution
question 1 water question 2 instant tea question 3 mixture
A chemistry student is given 650. mL of a clear aqueous solution at 33.°C. He is told an unknown amount of a certain compound X is dissolved in the solution. The student allows the solution to cool to 17.9 0C. At that point, the student sees that a precipitate has formed. He pours off the remaining liquid solution, throws away the precipitates, and evaporates the water from the remaining liquid solution under vacuum. More precipitate forms. The student washes, dries and weighs the additional precipitate. It weighs 0.150 kg.
1. Using only the information above, can you calculate the solubility of X in water at 17 0C.
2. If you said yes, calculate it.
Answer:
No, you can not calculate the solubility of X in water at 17 0C.
Explanation:
Solubility refers to the amount of a substance that dissolves in 1000 L of water.
To calculate the solubility of a solute in water, all the water is evaporated and the solid is carefully collected, washed, dried and weighed. The mass of solid obtained can now be used to calculate the solubility of the solute in water as long as there was no loss in mass of solid during the experiment.
In this case, the student threw away part of the solid that precipitated. As a result of this, the mass of solid obtained at the end of the experiment is not exactly the total mass of solute that dissolved in the solvent. Hence, the solubility of X in water at 17 0C can not be accurately calculated.
a log burns to ashes in a fireplace what kind of change is this
Answer:
A log burning to ashes is a chemical change.
Explanation:
Answer:
Chemical Change
Explanation:
Burning of wood is a chemical change as new substances which cannot be changed back [e.g. carbon dioxide] are formed. For example, if wood is burned in a fireplace, there is not wood anymore but ash.
which one of the following a compounds a.sugar b.rock salt c.iron d.alloy
which one of the following a
compound ?
a.sugar c.alloy
brock salt d.iron
Answer:
a
Explanation:
sugar is composed of different elements combined in a manner form
How many CaF are in a 1.7x10^25 please I need help fast!!
28 mol CaF
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 1.7 × 10²⁵ molecules CaF
[Solve] moles CaF
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 1.7 \cdot 10^{25} \ molecules \ CaF(\frac{1 \ mol \ CaF}{6.022 \cdot 10^{23} \ molecules \ CaF})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 28.2298 \ moles \ CaF[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
28.2298 mol CaF ≈ 28 mol CaF
Which of the following would NOT be a suitable solvent for organolithium and organomagnesium reagents?
a. CH3OCH2CH2OCH3
b. CH3CH2OH
c. THF (tetrahydrofuran)
d. CH3CH2OCH2CH3
Answer:
b
Explanation:
it could also be a, c, or d
What is the molecular weight of magnesium chloride?
Answer:
Magnesium chloride/Molar mass
95.211 g/mol
Explanation: