Taking a nap in the afternoon makes people more focused for the rest of the day.
is that indepedent or depedent
Answer:
dependent
Explanation:
it help them focus better
2. (Exercise 4.1.6) A liquid adhesive consists of a polymer dissolved in a solvent. The amount of polymer in the solution is important to the application. An adhesive dealer receives an order for 3000 lb of an adhesive solution containing 13% polymer by weight. On hand are 500 lb of 10% solution and very large quantities of 20% solution and pure solvent. Calculate the weight of each that must be blended together to fill this order. Use all of the 10% solution.
Answer:
800 lb of pure solvent , 1700 lb of 20% solution and 500 lb of 10% solution will be mixed to form 3000 lb of 13 % solution .
Explanation:
3000 lb of 13% solution is required .
Total adhesive in weight = 3000 x .13 = 390 lb of adhesive
Available = 500 lb of 10% solution = 50 lb of adhesive
Rest = 390 - 50 = 340 lb required .
rest mass of solution = 3000 - 500 = 2500 lb
mass of adhesive required = 340 lb
Let the mass of 20% required be V
mass of adhesive = .20 V
.20 V = 340
V = 1700
rest of the volume = 2500 - 1700 = 800 lb which will be of pure solvent
So 800 lb of pure solvent , 1700 lb of 20% solution and 500 lb of 10% solution will be mixed to form 3000 lb of 13 % solution .
To form 3000 lb of 13 % solution we need 800 lb of pure solvent, 1700 lb of 20% solution, and 500 lb of 10% solution.
Required wieghts of each solution:
The required solution is 3000 lb of 13% solution
Total adhesive = 3000 x 0.13 = 390 lb
Available adhesive = 500 lb of 10% solution = 50 lb
The required adhesive = 390 - 50 = 340 lb
The rest mass of solution is = 3000 - 500 = 2500 lb
If we assume the weight of 20% solution required to be W, then:
mass of adhesive = 0.20 W
0.20 W = 340
W = 1700 lb of 20% solution
Remaining volume = 2500 - 1700 = 800 lb
So, the pure solvent has a weight of 800 lb.
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Which of the following is not true about the field of science? (2 points)
a
It can be disproven by philosophy and religion.
b
It can change as new evidence is discovered.
c
It is based on observations about the natural world.
d
It is considered reliable because it is tested and verified.
Answer:
A. It Can be Disproven by Philosophy and Religon
Explanation:
It can be disproven by philosophy and religion is not true about the field of science. Therefore, option A is correct.
What science is, and what is it not?Science is nothing more than a method of investigation. And there are strict guidelines for this method. A specific science, such as biology or physics, has a concept structure based on the work of generations of scientists.
As a result, science and religion have opposing viewpoints on some issues. At the same time, philosophy collaborates with science and religion.
Science exists as a process of hypotheses being proposed and rejected, and the role of philosophy in this case is to investigate the criteria of science and rationality.
Thus, option A is correct.
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Warm Ocean currents, like the Gulf Stream current, will create a warmer wetter climate like the one in Northeastern United States and Western Europe.
True
or
False
The number of __________ must be equal on both sides of the ___________________. Reactions must be balanced because all things in nature need to be ___________________. There are __________________ rules that we follow when balancing reactions. The __________________ should never changed but only the __________________ can be changed when balancing the reaction. We are allowed to use __________________ or __________________ for the coefficients to balance a reaction. We must avoid _______________________ when balancing a reaction and only do ___________atom at a time.
5.In the atom, the electrons can be found in the
nucleus
neutron
isotope
electron cloud
Answer:
Probably D, Electron Cloud.
What is the volume in milliliters of 8.00 g of acetone?
Explanation:
density = mass/volume
Acetone has density 0.784 g/ml
volume = mass/ density
Volume = 8.00/0.784
= 10.204 ml
The volume of 8.00g of acetone is 10.204 ml.
How many moles of H2O are in 4.00 L of water?
Answer:
0.179 mol H₂O
Explanation:
STP - 1 atm, 0°C
Assuming we're in STP:
Step 1: Find conversions
1 mol = 22.4 L at STP
Step 2: Use Dimensional Analysis
[tex]4.00 \hspace{3} L \hspace{3} H_2O(\frac{1 \hspace{3} mol \hspace{3} H_2O}{22.4 \hspace{3} L \hspace{3} H_2O} )[/tex] = 0.178571 mol H₂O
Step 3: Simplify
We have 3 sig figs.
0.178571 mol H₂O ≈ 0.179 mol H₂O
How will you convert Aniline to Parabromo-Phenol
Answer:
Aniline is heated with acetic anhydride to form acetanilide. Treatment with bromine/acetic acid gives p-bromoacetanilide. Acid/alkaline hydrolysis gives p-bromoaniline.
Explanation:
Calculate the wavelength and frequency of an emitted photon of gamma radiation that has energy of 2.93 × 109 J/mol
Answer:
Explanation: Calculate the wavelength and frequency of an emitted photon of gamma radiation that has energy of 2.93 × 109 J/mol
What is a real life example of Charles’ law?
a guess about what will happen, not based on any previous observations or knowledge
hypothesis, theory, law
Answer:
Hypothesis
Explanation:
the percent water in ZnSO4.7H20.
Answer:
Approximately [tex]43.9\%[/tex] by mass.
Explanation:
Look up relevant relative atomic mass data on a modern periodic table:
[tex]\rm Zn[/tex]: [tex]65.38[/tex].[tex]\rm S[/tex]: [tex]32.06[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].[tex]\rm H[/tex]: [tex]1.008[/tex]Calculate the formula mass of [tex]\rm ZnSO_4[/tex], [tex]\rm H_2O[/tex], and [tex]\rm ZnSO_4\cdot 7\, H_2O[/tex]:
[tex]M(\rm ZnSO_4) \approx 65.38 + 32.06 + 4 \times 15.999 = 161.436\; \rm g \cdot mol^{-1}[/tex].
[tex]M(\rm H_2O) \approx 2 \times 1.008 + 15.999 = 18.015\rm g \cdot mol^{-1}[/tex].
[tex]M(\rm ZnSO_4\cdot 7\, H_2O) \approx 161.436 + 7 \times 18.015 \approx 287.541\; \rm g\cdot mol^{-1}[/tex].
In other words, each mole of [tex]\rm ZnSO_4\cdot 7\, H_2O[/tex] formula units has a mass of approximately [tex]287.541\; \rm g[/tex].
However, that one mole of [tex]\rm ZnSO_4\cdot 7\, H_2O[/tex] also contains seven moles of [tex]\rm H_2O[/tex] molecules, which has a mass of approximately [tex]7 \times 18.015 = 126.105\; \rm g[/tex].
Calculate the mass ratio of water in this compound:
[tex]\begin{aligned}& \%m(\text{water}) \\ &= \frac{m(\text{water})}{m(\text{compound})} \times 100\% \\ &\approx \frac{126.105\; \rm g}{287.541\; \rm g} \times 100\%\approx 43.9\%\end{aligned}[/tex].
Selma made an error while creating a chart to describe the technological design process for a new vacuum. Which best describes how Selma can correct the error in her chart? Change “Identify a need” to “Identify a problem.” Switch the descriptions for “Identify a need” and “Evaluate the solution.” Change “Implement the solution” to “Test the prototype.” Switch the stages “Evaluate the solution” and “Design a solution.”
Answer:
D
Explanation:
just did the test
Answer:
d
Explanation:
switch the stages evaluate the solution and design a solution
Which element is a halogen?
chlorine (Cl)
oxygen (O)
carbon (C)
radon (Rn)
Answer is chlorine (Cl)
The element that has been a halogen from the given elements have been Chlorine. Thus, option A is correct.
Halogen has been given as the group of metallic compounds that have been consisted of the one valence electrons in their last orbitals.
The halogens have been the most reactive elements and belong to group 18 of the periodic table. From the given set of elements, the number of valence electrons in the following has been:
Chlorine = 1 valence electronOxygen = 6 valence electronsCarbon = 4 valence electronsRadon = 8 valence electronsSince the element having 1 valence electron has been Chlorine. Thus, the element that has been a halogen from the given elements have been Chlorine. Thus, option A is correct.
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When converting from kilometers to meters, the decimal is moved _______.
a.
three places to the left
b.
two places to the left
c.
three places to the right
d.
two places to the right.
How do the prefixes in the metric system relate to the basic units?
In Parts I and II of the lab, what happened to the electrons of each element to produce the different colors of light? Explain your answers using important terms from the lesson and information provided in the laboratory.
Answer: Electrons must be heated to emitted light. When heat was added to the elements,the electrons absorbs the energy and moves to its excited state. Once the electronstarts to fall back to a lower orbit, it emits energy in the form of light. Thedifferent lights being emitted, depends on their wavelength
Explanation: I did the Quantization of Energy Lab
Lithium reacts with chlorine to form a new substance. What other element will also react with chlorine to form a new substance will similar properties?
Answer:
Sodium to form sodium chloride.
Explanation:
Hello.
In this case, since the reactivity of the elements belonging to same groups in close periods are intimately related to each other, we can infer that since lithium is able to react with chlorine to yield lithium chloride (LiCl), we can infer that the element reacting with chlorine and yielding a compound with similar properties to the LiCl should be sodium which is just below lithium in the periodic table, thus forming sodium chloride (NaCl).
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Why do nonmetals tend to gain electrons to form negative ions?
A. They have low electronegativities.
B. They gain electrons to balance the protons in their nuclei.
C. They gain the few electrons they need to form full octets.
D. They have fewer protons in their nuclei, so they attract electrons.
//APEX\\
Answer:
they gain the few electrons they need to form full octets
They gain the few electrons they need to form full octets. Hence, option C is correct.
What are electrons?Electrons are the smallest of the particles that make up an atom, and they carry a negative charge
The outer shells of non-metal atoms gain electrons when they form ions: the ions formed are negative because they have more electrons than protons. the ions formed have full outer shells.
Hence, option C is correct.
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How does energy flow from one organism to another
Answer:
A food chain shows how energy flows from one organism to another. In general, energy flows from the Sun to producers and then to consumers. The path is linear as the energy present in one step is transferred to the next. You can find specific examples of this pathway in an ecosystem
Gold is currently trading at very high price. Suppose that gold is selling for around $1860/ounce. How
many milligrams of gold could you buy with one quarter? [
Answer:
The answer is "3.81041978"
Explanation:
[tex]\to 1 \ OZ= 28.349523125 \ grams\\\\[/tex]
[tex]=28.349523125\times {1000} \ miligrams\\\\= 28349. 5231 \ miligrams\\[/tex]
In 1860 [tex]= 28349.5231 \ miligrams\\[/tex]
[tex]\to In \$ \ 1 = \frac{28349.5231}{1860} \ \ miligrams\\[/tex]
[tex]= 15.2416791 \ miligrams[/tex]
[tex]\ In \ 1 \ quarter = \$ \ 0.25[/tex]
[tex]\to \$ \ 0.25 = 15.2416791 \times 0.25 \ miligrams\\[/tex]
[tex]= 3.81041978[/tex]
The chemical formula for magnesium oxide is 2MgO. The number 2 represents the number of ___.
oxygen atoms
magnesium atoms
magnesium oxide molecules
Answer:
Magnesium oxide molecules
Explanation:
What is the mass number, symbol, and charge of an atom that contains 19 protons, 20 neutrons and 19 electrons?
Answer:
Explanation:
mass number = 19 + 20 = 39 (protons + neutrons)
The charge is 0. This is an atom
The symbol = K
Protons: 19
Electrons: 19
Neutrons: 20
What does physical science explore?
Answer:
The study of the inorganic world
Explanation:
That is, it does not study living things. (Those are studied in biological, or life, science.) The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.
Answer:
physics is matter and energy. it explores mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.
Identify each type of bond:
Answer:
The type of bond between the Oxygen atom and the hydrogen is Covalent
this is because the 2 electrons are being shared by both hydrogen and oxygen
The type of bond this molecule makes as a whole is called a Hydrogen Bond
A hydrogen bond is formed because of the partial +ve and -ve charge in a molecule
The cause of the partial +ve and -ve charge is the comparatively high electronegativity of oxygen which makes the electron get attracted towards the oxygen atom while the hydrogens try to maintain the maximum distance from the lone pairs due to repulsion
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Complete and balance the molecular equation for the reaction between aqueous solutions of strontium hydroxide and lithium phosphate, and use the states of matter to show if precipitate forms.
Answer:
Explanation:
2 Li₃(PO₄) + 3Sr(OH)₂ = Sr₃(PO₄)₂ (s) + 6LiOH
precipitate of strontium phosphate is formed.
The molecular equation for the reaction between aqueous solutions of strontium hydroxide and lithium phosphate is;
2 Li₃(PO₄) + 3Sr(OH)₂(aq) = Sr₃(PO₄)₂ (s) + 6LiOHThe Strontium phosphate, Sr₃(PO₄)₂ is precipitated out of solution and exists as a solid.First, we must identify the reactants and the products formed in the chemical reaction.
According to the question:
Aqueous solutions of strontium hydroxide, Sr(OH)₂Lithium phosphate, Li₃(PO₄)The reaction between the reactants above yields; Lithium hydroxide, LiOH and Strontium phosphate, Sr₃(PO₄)₂.
The balanced chemical equation is therefore;
2 Li₃(PO₄) + 3Sr(OH)₂(aq) = Sr₃(PO₄)₂ (s) + 6LiOHThe Strontium phosphate, Sr₃(PO₄)₂ is precipitated out of solution and exists as a solid.
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Element Name: Oxygen,
Symbol: 0
What is the Mass:
Protons:
Neutrons: 10
Electrons: 8
lon or Isotope:
Answer:
Element Name: Oxygen
Symbol: O
What is the Mass: 15.999 u
Protons: 8
Neutrons:10
Electrons: 8
Ion or Isotope: Oxide
If, as is typical, each of them breathes about 500 cm3cm3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year? Assume the typical respiratory rate for a healthy adult at rest is 15 breaths per minute. If, as is typical, each of them breathes about 500 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year? Assume the typical respiratory rate for a healthy adult at rest is 15 breaths per minute.
a) 1×108m31×108m3
b) 3×103m33×103m3
c) 1×104m31×104m3
d) 1×1010m31×1010m3
Answer:
b) 3x10³m³
Explanation:
The volume of each astronaut breathing in m³ is:
500cm³ * (1x10⁻⁶m³ / 1cm³) = 5x10⁻⁴m³
In 1 minute, the volume is:
5x10⁻⁴m³ * 15 = 7.5x10⁻³m³
In 1 hour:
7.5x10⁻³m³ /min * (60min / 1 hour) = 0.45m³/h
In 1 day:
0.45m³/h * (24h / 1 day) = 10.8m³/day
In 1 year:
10.8m³/day * (365 days / 1 year) = 3942m³ = 3.9x10³m³
That is approximately:
b) 3x10³m³A sample of gas occupies a volume of 67.1 mL . As it expands, it does 135.3 J of work on its surroundings at a constant pressure of 783 Torr . What is the final volume of the gas?
Answer:
[tex]V_2=1.363x10^{-3}m^3=1363mL[/tex]
Explanation:
Hello,
In this case, since the work done at constant pressure as in isobaric process is computed by:
[tex]W= P(V_2-V_1)[/tex]
Thus, given the pressure, initial volume and work, the final volume is:
[tex]V_2=V_1+\frac{W}{P}[/tex]
Whereas the pressure must be expressed in Pa as the work is given in J (Pa*m³):
[tex]P=783Torr*\frac{101325Pa}{760Torr} =104394Pa[/tex]
And the volumes in m³:
[tex]V_1=67.1mL*\frac{1m^3}{1x10^6mL} =6.71x10^{-5}m^3[/tex]
Thus, the final volume turns out:
[tex]V_2=6.71x10^{-5}m^3+\frac{135.3Pa*m^3}{104394Pa}\\\\V_2=1.363x10^{-3}m^3=1363mL[/tex]
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A car travels with a speed of 91.4 kilometers per hour (km/hr). Convert this speed to meters per second (m/s).
Show your work.
Round your final answer to three significant figures.
Type your answer...
Answer:
25.3889 m/s
Explanation:
We can simply write 91.4km/hr as,
91.4 km
1 hr
=91400 m
60 s × 60 s
=91400 m
3600 s
= 25.3889 m/s
