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]
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.
On your first day working in a laboratory, you are told to make up 1 Liter of a 0.5 Molar Tris solution with a pH of 7.4. You measure out the appropriate amount of Tris base and dissolve it in water. You then measure the pH and find out that it has an initial pH of 11. You add some concentrated HCl, and the pH begins to drop. However, as you approach the target pH, you find that you need to add large amounts of HCl to lower the pH even a small amount. If the molecular weight of Tris base is 121.14, how many grams did you use
Answer:
60.57g of TRIS did you use
Explanation:
The concentration of the Tris solution buffer is 0.5 molar (That is, 0.5 moles per liter). As you need to make 1L, you need to have in the solution 0.5 moles of TRIS.
To convert these moles of TRIS to grams you need to use the molecular weight of TRIS base (121.14g/mol), thus:
0.5 moles TRIS * (121.14g / mol) =
60.57g of TRIS did you useWhat is a real life example of Charles’ law?
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
the liquid immiscible with water is
During a volcanic eruption, lava flows at a rate of 26m/min. At this rate how far in kilometers can lava travel in 37 minutes?
Answer:
Like stratovolcanoes, they can produce violent, explosive eruptions, but their lava generally does not flow far from the originating vent. Cryptodomes The 1980 eruption of Mount St. Helens was an example; lava beneath the surface of the mountain created an upward bulge which slid down the north side of the mountain.
Explanation:
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
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.
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
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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Which of these statements best explains why chemistry is flexible?
Answer:
It adds new evidence
Explanation:
I just took them exam
Given that the specific heat of chromium is 0.455J/g∙K find the final temperature after 35.9J of energy is removed from 11.7g of chromium at 28.5°C.
Answer:
before I tell you the answer what is your name?
Explanation:
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
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) 3x10³m³What 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.
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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Which of the following statements concerning equilibrium constants is true? The equilibrium constant of the reverse reaction is equal in magnitude but opposite in sign of the forward reaction. When related reactions are added together, their equilibrium constants are added together. When the coefficients in a balanced chemical reaction are multiplied by two, the equilibrium constant is multiplied by two. When the coefficients in a balanced chemical reaction are multiplied by two, the equilibrium constant is not affected. When the coefficients in a balanced chemical reaction are multiplied by two, the equilibrium constant is squared.
Answer:
When the coefficients in a balanced chemical reaction are multiplied by two, the equilibrium constant is not affected.
Explanation:
The equilibrium constant of a reaction is known to remain steady.
Even if all the coefficients of all the species in the reaction are multiplied by two, the value of the equilibrium constant will reamin the same because the equilibrium position will not change as a result of that.
The equilibrium constant of a chemical reaction is the value of its reaction quotient at chemical equilibrium, a state approached by a dynamic chemical system after sufficient time has elapsed at which its composition has no measurable tendency towards further change.
The equilibrium depends on the following:-
Volume PressureWhen the coefficients in a balanced chemical reaction are multiplied by two, the equilibrium constant is not affected. The equilibrium constant of a reaction is known to remain steady.
Even if all the coefficients of all the species in the reaction are multiplied by two, the value of the equilibrium constant will remain the same because the equilibrium position will not change as a result of that.
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A 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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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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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
The specific heats at constant pressure of some common gases are provided as a thirdorder polynomial: �;<<< = � + �� + ��C + ��E, with units J/(mol K). For methane (CH4) the coefficients are � = 19.89, � = 5.024 × 10NC, � = 1.269 × 10NO, � = −11.01 × 10NQ. At a production facility, the gas in a 50-liter tank is compressed to 3,600 psi (gage) during which time the temperature rises to 200°F. How much heat in J is given off as the gas cools to room temperature? Suppose the compressed gas is helium, how much heat would be given off in this case?
Answer:
1.991 kJ
Explanation:
Calculate the amount of heat ( J )
CH4 ;
coefficients are : a = 19.89 , b = 5.02 * 10^-2 , c = 1.269 * 10^-5 , d = -11.01 * 10^-9
attached below is the detailed solution
If the density of
gold is 19.3 g/cm3 .
What happens to
the density of gold
if I have double the
mass or 2 gold bars?
Doubles
Halves
Stays the same
A piece of an unknown substance has a volume of 2.5 mL and a mass of
20 grams. What is the density of this substance?
Answer:
The answer is
8 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass of substance = 20 g
volume = 2.5 mL
The density of the substance is
[tex]density = \frac{20}{2.5} \\ [/tex]
We have the final answer as
8 g/mLHope this helps you
Calculate the average atomic mass for the following element given information about the relevant isotopes: (Isotope 1) Mass = 20 amu; Isotopic abundance = 90.92% (Isotope 2) Mass = 21 amu; Isotopic abundance = 0.257% (Isotope 3) Mass = 22 amu; Isotopic abundance = 8.82%
Answer:
The average atomic mass of given element is 20.18 amu.
Explanation:
Given data:
Abundance of 1st isotope mass 20 amu = 90.92%
Abundance of 2nd isotope mass 21 amu = 0.257%
Abundance of 3rd isotope mass 22 amu = 8.82%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass = (90.92×20)+(0.257×21)+(8.82×22) /100
Average atomic mass = 1818.4 + 5.397 +194.04 / 100
Average atomic mass = 2017.819 / 100
Average atomic mass = 20.18 amu.
The average atomic mass of given element is 20.18 amu.
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?
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:
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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Billy is trying to figure out what type of wood to use for building a model boat. He has a block of wood with a volume of 8.0 cubic centimeters (cm) and a mass of 4.0 grams (g). What is the density of the block of wood in g/cmº to the nearest tenth? 0.5 2.0 4.0 32.0
Answer:
ρ = 0.5 g/cm³
Explanation:
Step 1: Given data
Volume of the block of wood (V): 8.0 cm³
Mass of the block of wood (m): 4.0 g
Density of the block of wood (ρ): ?
Step 2: Calculate the density of the block of wood
The density of the block of wood is equal to its mass divided by its volume. The mathematical expression is:
ρ = m/V
ρ = 4.0 g/8.0 cm³
ρ = 0.5 g/cm³
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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