Answer:
To show what they know!
Explanation:
If you're not showing how you did your experiment thoroughly, then nobody will understand what you did! For instance, if you spent 2 weeks studying really hard about how music affects different kinds of animals, and only put down that music affects animals and no showing your work. Then no one will know how much effort and work you put into it! If you put all the minor details into the presentation, then more than likely everyone will know where your coming from!
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name four methods of separating mixtures
Answer:
Chromatography
Distillation
Evaporation
Filtration
Explanation:
Chromatography involves solvent separation on a solid medium.
Distillation takes advantage of differences in boiling points.
Evaporation removes a liquid from a solution to leave a solid material.
Filtration separates solids of different sizes.
Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.
With a(n) _____, the results are analyzed as if you had separate experiments at each level of the other independent variable
With a simple main effect, the results are analyzed as if you had separate experiments at each level of the other independent variable.
What is simple main effect?In the realm of factorial ANOVA, an enlightening endeavor known as a simple main effect analysis arises. Within this statistical examination, the intricate interplay of two or more independent variables upon a dependent variable is meticulously unraveled.
When a notable interplay between these independent variables materializes, the pursuit of comprehension beckons the astute pursuit of simple main effects analyses, illuminating the essence of the interaction.
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Which of the following properties indicates the presence of weak intermolecular forces in a liquid: a .a high boiling point
b.a high surface tension
c.a low vapor pressure
d.a low heat of vaporization
e.none of the above.
A low vapor pressure indicates the presence of weak intermolecular forces in a liquid. The correct answer is: c.
The strength of intermolecular forces in a liquid determines the vapor pressure of the liquid. A liquid with strong intermolecular forces will have a low vapor pressure, while a liquid with weak intermolecular forces will have a high vapor pressure.
This is because the molecules in a liquid with weak intermolecular forces are more likely to escape from the surface of the liquid and enter the gas phase.
The other options are incorrect because they are all properties that indicate the presence of strong intermolecular forces in a liquid. A high boiling point indicates that a large amount of energy is required to overcome the intermolecular forces and vaporize the liquid.
A high surface tension indicates that the molecules in the liquid are strongly attracted to each other and to the surface of the liquid. A low heat of vaporization indicates that a small amount of energy is required to overcome the intermolecular forces and vaporize the liquid.
Therefore, the only property that indicates the presence of weak intermolecular forces in a liquid is a low vapor pressure.
Therefore, the correct option is C, a low vapor pressure.
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You have a hydrate of compound X that is 60.26g. You heat the hydrate, allow it to cool, and then remass it. The new mass is 23.0g. The molar mass of compound X as an anhydrate is 100 g/mol.
Answer:
100gmol
Explanation:
(GIVING BRAINLIEST) Which is NOT an example of a good source of complex carbohydrates?
peas
beans
whole-wheat bread
white bread
Answer: White bread
Explanation:
A piece of metal of mass 23 g at 100 ◦C is
placed in a calorimeter containing 55.4 g of
water at 25◦C. The final temperature of the
mixture is 63.4
◦C. What is the specific heat
capacity of the metal? Assume that there is
no energy lost to the surroundings.
Answer in units of J
g ·
◦ C
.
Answer:
10.58 J/g-°C
Explanation:
To find the specific heat capacity of the metal, you need to know how much heat was lost when it reacted with water.
You know that there are 55.4 g of water, the initial temp. of water is 25°C, and the final temp. (the mixture's temp.) is 63.4°C.
You should also know that the specific heat capacity of water is 4.186 J/g-°C.
Plug this into the equation the q=mcΔT.
q = (55.4 g)(4.186 J/g-°C)(63.4°C - 25°C)
q = 8905.12896 J
If 8905.12896 J was gained by the water, then 8905.12896 J must have been lost from the metal.
You know that there are 23 g of the metal and that its initial temp. is 100°C.
Plug this information into q=mcΔT.
8905.12896 J = (23 g)(C)(63.4°C - 100°C)
C = 10.58 J/g-°C
*When you plug all of this into the calculator, it will result in a negative number but keep in mind that heat was LOST by the metal so 8905.12896 J is essentially negative. So the negative cancels out.*
How are the environment of a swamp in a rain forest similar
(06.05 LC)
Why is it important to maintain records of the procedures of an experiment?
points)
Multiple Choice
Why is sublimation an effective technique for the isolation of pure caffeine?
Select one or more:
O The impurities of caffeine synthesis are expected to decompose at high temperatures.
O The purified caffeine will vaporize and can be collected as a solid, leaving impurities behind.
O When heated, caffeine will sublime at a lower temperature than it melts.
O The synthesis of caffeine tends not to produce impurities, so a more thorough purification technique is not needed.
Sublimation is an effective technique for the isolation of pure caffeine because: The purified caffeine will vaporize and can be collected as a solid, leaving impurities behind.
So, the answer is B.
Sublimation is a chemical technique that is used to isolate the pure form of a substance from impure or mixed form. It is the phase transition of a solid directly to a gas without passing through a liquid phase.
It is an effective technique for the isolation of pure caffeine due to the following reasons:During sublimation, the purified caffeine will vaporize and can be collected as a solid, leaving impurities behind.
The caffeine is heated, and the heat causes the solid to vaporize directly from the solid phase to the gas phase, skipping the liquid phase. Thus, it separates the caffeine from impurities and provides pure caffeine. Therefore, option B is correct.
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Which of the following is an example of a physical property?*
the mass
ability to rust
flammability
ability to combust
Answer: The mass
Explanation: ability to rust, flammability, and ability to combust are chemical properties.
What is the molar concentration (molarity) of 1.0 mol of KCl dissolved in 750 mL of
solution?
Answer:
Molarity is moles per liter. You have one mole in 0.750 liters
Explanation:
How many militias of 5.0 M H2SO4 (aq) stock silly toon are needed to prepare 100. Ml of 0.25 M H2SO4 (aq)
Answer:
5 mL
Explanation:
As this is a problem regarding dilutions, we can solve it using the following formula:
C₁V₁=C₂V₂Where subscript 1 refers to the initial concentration and volume, while 2 refers to the final C and V. Meaning that in this case:
C₁ = 5.0 MV₁ = ?C₂ = 0.25 MV₂ = 100 mLWe input the data:
5.0 M * V₁ = 0.25 M * 100 mLAnd solve for V₁:
V₁ = 5 mLAnswer:
5 mL of 5.0 M H₂SO₄ (aq) are needed to prepare 100 mL of 0.25 M H₂SO₄ (aq).
Explanation:
In chemistry, dilution is the reduction of the concentration of a chemical in a solution.
Then, dilution consists of preparing a less concentrated solution from a more concentrated one, and it consists simply by adding more solvent to the same amount of solute. That is, the amount or mass of the solute is not changed, but the volume of the solvent varies: as more solvent is added, the concentration of the solute decreases, since the volume (and weight) of the solution increases.
A dilution is calculated by the expression:
Ci*Vi = Cf*Vf
where:
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volumeIn this case, you know:
Ci=5 MVi= ?Cf= 0.25 MVf= 100 mLReplacing:
5 M*Vi = 0.25 M* 100 mL
Solving:
[tex]Vi= \frac{0.25 M*100 mL}{5 M}[/tex]
Vi= 5 mL
5 mL of 5.0 M H₂SO₄ (aq) are needed to prepare 100 mL of 0.25 M H₂SO₄ (aq).
What is the molarity of a solution that contains 0.202 mol KCl in 7.98 L solution?
Explanation:
molarity = no. of moles of solute/solution in litres
molarity =0.202/7.98
=0.025 M
think back to our hypotheses of chapter 12 regarding melting points (that some force kept the material together). given those hypotheses, what would you predict about the forces that hold atoms of cesium together in the solid metal compared to the forces that hold atoms of lithium together? explain why.
Based on the hypotheses discussed in Chapter 12 regarding melting points and the forces that hold materials together, we can make a prediction about the forces holding atoms of cesium and lithium together in their solid metal forms.
One hypothesis suggests that stronger forces between atoms result in higher melting points. Another hypothesis proposes that metals are held together by metallic bonds, where positively charged metal ions are surrounded by a sea of delocalized electrons.
Considering these hypotheses, we can infer that cesium atoms would be held together by stronger forces compared to lithium atoms in their solid metal forms. This is because cesium is located further down the periodic table, belonging to Group 1 (alkali metals), whereas lithium is in Group 2 (alkaline earth metals). As we move down a group in the periodic table, the atomic radius generally increases, leading to weaker forces of attraction between atoms.
Therefore, the larger atomic size of cesium compared to lithium would result in weaker interatomic forces, making cesium's solid metal form have a lower melting point compared to lithium.
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If there is a band in the W2 lane of the Western result, what could you conclude about the physical protein structure of rGFP present in this band? If so what would the MW be?
The MW of rGFP in the band can be determined by comparing the mobility of the band with that of protein standards run on the same gel.
The Western blotting technique is utilized to identify and detect specific proteins in a sample of tissue or extract. If there is a band in the W2 lane of the Western blot, one can conclude that rGFP is present in that band. The physical protein structure of rGFP could not be inferred from the presence of a band in the W2 lane of the Western blot. This requires additional analysis such as X-ray crystallography, nuclear magnetic resonance, or cryo-electron microscopy to analyze protein structure. MW is the molecular weight which can be determined using a molecular weight marker that runs in a parallel lane to the protein extract on the gel. In the Western blotting method, SDS-PAGE is typically used to separate proteins based on their size. The SDS-PAGE gel is calibrated with protein markers that have a known molecular weight. Hence, the MW of rGFP in the band can be determined by comparing the mobility of the band with that of protein standards run on the same gel.
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help me help me help me
Answer:
i dont know i do this for points
Explanation:
How do i make observations and calculate data involving metric units?
Answer:
How to make scientific observations?
Observe something through your senses or record information using scientific tools and instruments and ask questions about your scientific observations (e.g., natural phenomena).
How to calculate data involving metric units?
To convert from one unit to another within the metric system usually means moving a decimal point (e.g., 1000000mm = 100000cm = 10000dm = 1000m = 100dkm = 10hm = 1km).
Balance the following redox equations by the half-reaction method: a. Mn^2+ + H_2O_2 rightarrow MnO_2 + H_2O (in basic solution) b. Bi(OH)_3 + SnO_2^2- rightarrow SnO_3^2- + Bi (in basic solution) c. Cr_2O_7^2- + C_2O_4^2- rightarrow Cr^3+ + CO_2 (in acidic solution) d. ClO_3^-+ Cl^- rightarrow Cl_2 + Cl_O_2 (in acidic solution) e. Mn^2+ + BiO_3^- rightarrow Bi^3+ + MnO_4^- (in acidic solution)
The balanced equation is:
(a) 2Mn^2+ + 2H2O2 + 4OH^- → 2MnO_2 + 4H2O.
(b)3SnO2^2- + 6OH^- + 2Bi(OH)3 → 3SnO3^2- + 2Bi + 9H2O. (c)14Cr2O7^2- + 7C2O4^2- + 22H2O → 4Cr^3+ + 14CO2 + 28H+ + 28e^-. (d)2ClO3^- + 16H^+ + 3Cl^- → 3Cl2 + 8H2O
(e)10BiO3^- + 60H^+ + 12Mn^2+ → 10Bi^3+ + 30H2O + 12MnO4^-
a. In the balanced redox equation Mn^2+ + H_2O_2 → MnO_2 + H_2O (in basic solution), the half-reactions are:
Reduction: Mn^2+ → MnO_2
Oxidation: H_2O_2 → H_2O
To balance the reduction half-reaction, we need to add four OH^- ions to the left side: Mn^2+ + 4OH^- → MnO_2 + 2H2O + 2e^-
To balance the oxidation half-reaction, we add four OH^- ions to the right side and water molecules to balance the oxygen atoms: H2O2 + 4OH^- → 2H2O + 2e^-
Now, multiply the reduction half-reaction by two and the oxidation half-reaction by one to equalize the electrons:
2(Mn^2+ + 4OH^- → MnO_2 + 2H2O + 2e^-)
H2O2 + 4OH^- → 2H2O + 2e^-
Finally, add the two half-reactions together and cancel out the common species: 2Mn^2+ + 2H2O2 + 4OH^- → 2MnO_2 + 4H2O
b. The balanced redox equation Bi(OH)3 + SnO2^2- → SnO3^2- + Bi (in basic solution) can be balanced by following these steps:
Reduction: SnO2^2- → SnO3^2-
Oxidation: Bi(OH)3 → Bi
To balance the reduction half-reaction, add two OH^- ions to the left side: SnO2^2- + 2OH^- → SnO3^2- + H2O + 2e^-
To balance the oxidation half-reaction, add six OH^- ions to the right side: Bi(OH)3 → Bi + 3H2O + 3e^-
Multiply the reduction half-reaction by three and the oxidation half-reaction by two to equalize the electrons:
3(SnO2^2- + 2OH^- → SnO3^2- + H2O + 2e^-)
2(Bi(OH)3 → Bi + 3H2O + 3e^-)
Combine the two half-reactions and cancel out the common species:
3SnO2^2- + 6OH^- + 2Bi(OH)3 → 3SnO3^2- + 2Bi + 9H2O
c. In the acidic solution, the balanced redox equation Cr2O7^2- + C2O4^2- → Cr^3+ + CO2 can be balanced as follows:
Reduction: Cr2O7^2- → Cr^3+
Oxidation: C2O4^2- → CO2
To balance the reduction half-reaction, add seven H2O molecules to the right side: Cr2O7^2- → 2Cr^3+ + 7H2O + 14e^-
To balance the oxidation half-reaction, add eight H^+ ions to the left side:
C2O4^2- + 2H2O → 2CO2 + 4H+ + 4e^-
Multiply the reduction half-reaction by two and the oxidation half-reaction by seven to equalize the electrons:
2(Cr2O7^2- → 2Cr^3+ + 7H2O + 14e^-)
7(C2O4^2- + 2H2O → 2CO2 + 4H+ + 4e^-)
Combine the two half-reactions and cancel out the common species:
14Cr2O7^2- + 7C2O4^2- + 22H2O → 4Cr^3+ + 14CO2 + 28H+ + 28e^-
d. In the acidic solution, the balanced redox equation ClO3^- + Cl^- → Cl2 + ClO2 can be balanced as follows:
Reduction: ClO3^- → ClO2
Oxidation: Cl^- → Cl2
To balance the reduction half-reaction, add two H^+ ions to the right side:
ClO3^- + 2H^+ → ClO2 + H2O + 2e^-
To balance the oxidation half-reaction, add two H2O molecules to the left side:
2Cl^- → Cl2 + 2e^-
Multiply the reduction half-reaction by two and the oxidation half-reaction by one to equalize the electrons:
2(ClO3^- + 2H^+ → ClO2 + H2O + 2e^-)
Cl^- → Cl2 + 2e^-
Combine the two half-reactions and cancel out the common species:
2ClO3^- + 16H^+ + 3Cl^- → 3Cl2 + 8H2O
e. In the acidic solution, the balanced redox equation Mn^2+ + BiO3^- → Bi^3+ + MnO4^- can be balanced as follows:
Reduction: BiO3^- → Bi^3+
Oxidation: Mn^2+ → MnO4^-
To balance the reduction half-reaction, add six H^+ ions to the left side:
BiO3^- + 6H^+ → Bi^3+ + 3H2O + 6e^-
To balance the oxidation half-reaction, add eight H^+ ions to the right side:
Mn^2+ → MnO4^- + 8H^+ + 5e^-
Multiply the reduction half-reaction by five and the oxidation half-reaction by two to equalize the electrons:
5(BiO3^- + 6H^+ → Bi^3+ + 3H2O + 6e^-)
2(Mn^2+ → MnO4^- + 8H^+ + 5e^-)
Combine the two half-reactions and cancel out the common species:
10BiO3^- + 60H^+ + 12Mn^2+ → 10Bi^3+ + 30H2O + 12MnO4^-
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How can wind produce erosion?
Wind can cause plants to split a rock apart.
Wind can pick up rocks and then drop it into smaller pieces.
Wind blowing sand against a rock can reduce the rock's size.
Wind can roll rock near moving water.
Answer:
It would be C. Wind blowing against a rock can reduce the rock´s size.
Explanation:
Computer says I put 2 things wrong. Where I made a mistake?
Using the Lewis concept of acids and bases, identify the Lewis acid and base in each of the following reactions:
Fe(NO3)3(s)+6H2O(l)?Fe(H2O)63+(aq)+3NO3?(aq)
NH3(g)+HCl(g)?NH4Cl(s)
I put them like that:
Lewis acid: Fe(NO3)3
Lewis base: H2O
Neither: HCl, NH3
Lewis acid: Fe(NO3)3Lewis base: H2OThe Lewis acid is H+ and the Lewis base is NH3.
The Lewis concept of acids and bases, Lewis acids are those that have an incomplete valence shell and accept electrons from a Lewis base. A Lewis base has at least one electron pair available to form a covalent bond with a Lewis acid, filling its valence shell. The Lewis acid and base in each of the following reactions are given below:Fe(NO3)3(s) + 6H2O(l) ⟶ Fe(H2O)63+(aq) + 3NO3?(aq)The Lewis acid is Fe3+ and the Lewis base is H2O.NH3(g) + HCl(g) ⟶ NH4Cl(s)The Lewis acid is H+ and the Lewis base is NH3.Neither HCl nor NH3 is a Lewis acid or base in this particular reaction. Therefore, you made a mistake in your answer. The correct answers are as follows:Lewis acid: Fe(NO3)3Lewis base: H2OThe Lewis acid is H+ and the Lewis base is NH3.
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Which boundary or zone adds new material to the lithosphere (the hard outer crust of the Earth)
Answer:Divergent Boundaries(or Boundary)
Explanation:took the test and got it right
what is the chemical equation for
3fe(s)+4h2o(l)→fe3o4(s)+4h2(g)
Answer:
3fe s )+ 4h2o G )= fe3o4 s )+ 4h2 G
Explanation: 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) (i) Iron metal is getting oxidised. (ii) Water is getting reduced. (iii) Water is acting as reducing agent.
Explanation:
i make a search
50 POINTS PLEASE ANSWER CORRECTLY
Two balls collide on a pool table. Before the collision, ball 1 is traveling with a speed of 4 m/s, and ball 2 is at rest. After the collision both balls are in motion.
What has happened in this collision?
A. There was no change in ball 2's velocity, therefore momentum was not conserved.
B. Ball 2's velocity decreased, and it gained some of ball 1's momentum.
C. Ball 1's velocity decreased, and it gained momentum.
D. Ball 2's velocity increased, and it gained some of ball 1's momentum.
Answer:
D
Explanation:
With the collision, obviously Ball 2's velocity increased, while Ball 1 slowed down a little bit due to the impact. This decrease in velocity caused a decrease in Ball 1's Momentum. Satisfying both conditions, option D is right.
most modern catalytic converters in automobiles have a surface with a platinum-rhodium catalyst. for which of the following reactions is this catalyst used
The platinum-rhodium catalyst used in most modern catalytic converters in automobiles is primarily employed for the oxidation of harmful pollutants. It facilitates the conversion of carbon monoxide (CO) and unburned hydrocarbons (HC) into carbon dioxide (CO2) and water (H2O).
The platinum-rhodium catalyst in catalytic converters is specifically designed to promote the oxidation reactions of carbon monoxide (CO) and unburned hydrocarbons (HC). These reactions are crucial for reducing the emission of harmful pollutants from automobile exhaust gases.
Carbon monoxide (CO) is a toxic gas produced during incomplete combustion. The platinum-rhodium catalyst assists in the oxidation of CO, converting it into carbon dioxide (CO2). This reaction is represented by the equation:
2 CO + O2 → 2 CO2
Unburned hydrocarbons (HC) are volatile organic compounds (VOCs) that contribute to smog formation. The platinum-rhodium catalyst aids in their oxidation, transforming them into carbon dioxide (CO2) and water (H2O). The general reaction can be expressed as:
HC + O2 → CO2 + H2O
The platinum-rhodium catalyst is essential in facilitating these oxidation reactions, promoting more complete combustion of harmful pollutants and reducing their negative environmental impact.
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can we observe a lunar eclipse during a new moon phase? explain your answer.
please help me thx
subject is science
Answer: There is no eclipse. However, two or four times a year, the Moon travels through some portion of the Earth's penumbral or umbral shadows, resulting in one of the three types of eclipses mentioned above. When the Moon crosses between the Earth and the Sun, this occurs. This is only possible when the Moon is in its New Moon phase.
Explanation:
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(b) identify both of the brønsted-lowry conjugate acid-base pairs in the neutralization reaction above. for each pair, label the acid and the base.
In the neutralization reaction, the Brønsted-Lowry conjugate acid-base pairs are the acid HCl and the base OH- as well as the acid H₂O and the base Cl-.
Which species act as acid and base?The neutralization reaction involves the formation of two Brønsted-Lowry conjugate acid-base pairs. The acid-base pairs are HCl (acid) and OH⁻ (base), as well as H₂O (acid) and Cl⁻ (base). In this reaction, the acid donates a proton (H+) to the base, resulting in the formation of water and a salt. HCl donates a proton to OH- to form water, while H₂O donates a proton to Cl⁻ to form hydrochloric acid (HCl). The transfer of protons between the acid and base creates the conjugate acid-base pairs.
Brønsted-Lowry acid-base theory describes the transfer of protons (H+) between acids and bases. Acids are proton donors, while bases are proton acceptors. In a neutralization reaction, an acid reacts with a base to form a salt and water.
The acid donates a proton to the base, forming a conjugate base, while the base accepts the proton, forming a conjugate acid. In the given neutralization reaction, HCl is the acid and OH- is the base, forming water. Simultaneously, H₂O acts as an acid, donating a proton to Cl⁻, which acts as a base, forming HCl. Understanding conjugate acid-base pairs is essential in comprehending acid-base reactions and their equilibrium.
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hi does anyone know how to do chem cause I might need a tut.or or sum.
can you guys just comment if you good and ill send my sn.ap for you guys to help me id.k...
thanks anyways
Ask your parents or guardian for a tutor.
It's very dangerous to give someone your snap online that you don't know!
Have a nice day <3
what is the energy that can transform from one thing to another
Answer:
Energía geotérmica (calor → energía eléctrica) Motores térmico, como el motor de combustión interna utilizado en automóviles o el motor de vapor (calor → energía mecánica) Energía térmica oceánica (calor → energía eléctrica) Represas hidroeléctricas (energía potencial gravitacional → energía eléctrica)
Explanation:
Answer:
One type of energy can change into another type of energy. Energy transformation means the changing of energy from one type to another, e.g. from kinetic energy to electrical energy, or from potential energy to kinetic energy.
Explanation:
What is the percentage by mass of sulphur in Al2(SO4)3[A12SO4 =
342g/mol, S = 32]
Answer: The percentage by mass of sulphur in [tex]Al_2(SO_4)_3[/tex] is 9.36%
Explanation:
Mass percent of an element is the ratio of mass of that element by the total mass expressed in terms of percentage.
[tex]{\text {Mass percentage}}=\frac{\text {mass of sulphur}}{\text {Total mass}}\times 100\%[/tex]
Given: mass of sulphur = 32 g/mol
mass of [tex]Al_2(SO_4)_3[/tex] = 342 g/mol
Putting in the values we get:
[tex]{\text {Mass percentage}}=\frac{32g/mol}{342g/mol}\times 100\%=9.36\%[/tex]
The percentage by mass of sulphur in [tex]Al_2(SO_4)_3[/tex] is 9.36%
20.4 g of carbon reacts with 54.4 g of oxygen. what is the empirical formula for this compound?
To determine the empirical formula of a compound, the given masses of the elements (carbon and oxygen) are used to calculate the moles of each element. The mole ratio between the elements is then determined to find the simplest whole number ratio, which represents the empirical formula.
First, we calculate the moles of carbon and oxygen using their respective molar masses. The molar mass of carbon (C) is approximately 12.01 g/mol, and the molar mass of oxygen (O) is approximately 16.00 g/mol.
Moles of carbon = 20.4 g / 12.01 g/mol ≈ 1.70 mol
Moles of oxygen = 54.4 g / 16.00 g/mol ≈ 3.40 mol
Next, we determine the simplest whole number ratio by dividing the number of moles of each element by the smallest number of moles. In this case, the smallest number of moles is approximately 1.70 mol (carbon).
Carbon: 1.70 mol / 1.70 mol ≈ 1
Oxygen: 3.40 mol / 1.70 mol ≈ 2
Therefore, the empirical formula for this compound is C1O2, which can be simplified to CO2.
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