Answer:
a) 0.018 ft^3
b) 55.55 lb/ft^3
Explanation:
given that mass m = 2 lb
volume = 62.6 in^3
= 0.036 ft^3
now, specific volume = volume/mass [specific volume is the reciprocal of density]
=0.036/2 = 0.018 ft^3.
b) density = mass/ volume = 2/0.036 = 55.55 lb/ft^3
The Density of pure carbon in Diamond form is 3.52 g/cm^3. How many cubic inches would 23.7 moles of pure diamond occupy?
Answer : The volume of pure diamond is [tex]0.493inch^3[/tex]
Explanation : Given,
Density of pure carbon in diamond = [tex]3.52g/cm^3[/tex]
Moles of pure diamond = 23.7 moles
Molar mass of carbon = 12 g/mol
First we have to calculate the mass of carbon or pure diamond.
[tex]\text{ Mass of carbon}=\text{ Moles of carbon}\times \text{ Molar mass of carbon}[/tex]
Molar mass of carbon = 12 g/mol
[tex]\text{ Mass of carbon}=(23.7moles)\times (12g/mole)=284.4g[/tex]
Now we have to calculate the volume of carbon or pure diamond.
Formula used:
[tex]Density=\frac{Mass}{Volume}[/tex]
Now putting all the given values in this formula, we get:
[tex]3.52g/cm^3=\frac{284.4g}{Volume}[/tex]
Volume = [tex]80.8cm^3[/tex]
As we know that:
[tex]1cm^3=0.061inch^3[/tex]
So,
Volume = [tex]0.061\times 80.8inch^3[/tex]
Volume = [tex]0.493inch^3[/tex]
Therefore, the volume of pure diamond is [tex]0.493inch^3[/tex]
Useful:
Harmful:
2. Give an example of how Bacteria can be useful and harmful to man.
Answer:
normal flora useful
Explanation:
protect the skin
A certain type of decorative lamp contains colored liquids from globs that break off and rise to the top of the liquid.the globs rise due to
Answer:
Convection.
Explanation:
Due to the heat of the lamp, the liquid increases its temperature. This increase produces an increase in the energy and volume of the globs. But it also causes a decrease in the density of the bubble. As a result, they break off and rise to the top. We can see that the globs rise owing to convection because there is a transfer of heat in the fluid caused by the movement of the fluid's molecules with more energy towards the surface, where the molecules have less energy and are colder.
How many moles of dinitrogen tetroxide (N2O4) are in 6.49 x 109 particles?
1.08 x 10–14 mol N2O4
3.091 x 1033 mol N2O4
6.02 x 1023 mol N2O4
1.08 x 10–23 mol N2O4
A molecular compound has the empirical formula XY2. Which of the following is a
possible molecular formula?
A.X2Y8
B.ХЗҮЗ
C.X2Y4
D.ХЗҮ9
Answer: C.X2Y4
Explanation:
Given that :
Compound has the empirical formula :
Empirical formula : CY2
The empirical formula expresses in Lowest term the whole ratio of the compound.
.
Empirical. Formula is usually written as :
XnYn+1
For instance, the ratio of the compound is :
n : n+1
Therefore, in the question:
XY2
Ratio :
X = 1 ; Y = 2 ; 1 /2 ;hence, the possible molecular number :
The possible moleculars are those whose XY mole ratio is 1 : 2
Comparing the ratios :
X2Y8 = 2/8 = 1 :4
ХЗҮЗ = 3/3 = 1 : 1
X2Y4 = 2 /4 = 1: 2
ХЗҮ9 = 3/9 = 1 :3
Hence, the only possible molecular formula is X2Y4
What is happening to the matter in this system?
Answer:
good luck maybe A im not smart though
Explanation:
The density of a certain type of plastic is 0.80g/cm. If a sheet of this plastic is 10.0 m long, 1.0 m wide, and 1 cm thick, what is its mass? Enter your answer in scientific notation.
Answer:
m = 8.0×10⁴ g
Explanation:
Given data:
Density of plastic = 0.80 g/cm³
Dimensions of plastic sheet = 1.0 m × 10.0 m ×1 cm
Mass of sheet = ?
Solution:
First of all we will convert the length and width into cm.
length = 10.0 ×100 = 1000 cm
width = 1.0 ×100 = 100 cm
Volume = 1000 cm × 100 cm × 1 cm
Volume = 100000 cm³
Mass of sheet:
D = m/v
0.80 g/cm³ = m / 100000 cm³
m = 0.80 g/cm³ × 100000 cm³
m = 80,000 g
m = 8.0×10⁴ g
Reaction: 2 N20 --> 2 N2 + O2, how many moles of nitrogen gas will be
produced when 9.84 moles of dinitrogen monoxide decomposes?
Answer:
Number of moles of nitrogen gas = 9.84 mol
Explanation:
Given data:
Number of moles of nitrogen gas = ?
Number of moles of dinitrogen monoxide = 9.84 mol
Solution:
Chemical equation:
2N₂O → 2N₂ + O₂
Now we will compare the moles of N₂O and N₂
N₂O : N₂
2 : 2
9.84 : 9.84
15. transition metals has ____ valence electrons
2 valence electrons
Explanation:
Most transition metals have 2 valence electrons. Valence electrons are the sum total of all the electrons in the highest energy level (principal quantum number n). Most transition metals have an electron configuration that is ns2(n−1)d , so those ns2 electrons are the valence electrons.
Studying the decay of radioactive isotopes in dead organisms helps scientists to identify fossilized remains. The ratio of C-12 to C-14 in the atmosphere is 1 x 1012. The table shows this ratio inside the body of three organisms.
C12/C14 Ratio
Organism C12/C14 Ratio
X 8 x 1012
Y 2 x 1012
Z 1 x 1012
What can most likely be concluded from the above information?
Only Organism Z is alive, and Organism X has been dead longer than Organism Y.
Only Organism Z is alive, and Organism Y has been dead longer than Organism X.
Only Organism X is alive, and Organism Y has been dead longer than Organism Z.
Only Organism X is alive, and Organism Z has been dead longer than Organism Y.
Answer:
Only Organism Z is alive, and Organism X has been dead longer than Organism Y.
Explanation:
After the death of an organism, there is radioactive disintegration of C-14 allotrope of carbon, which increases the ratio of C-12 to C-14 in a dead organism as compared to a living organism.
The study of chemistry and its bond is called chemistry.
The correct answer is A
After the death of an organism, there is radioactive disintegration occurs which leads to the breakdown of C-14 allotrope of carbon into the other isotopes,
Breakdown of these isotopes leads to the increase in the ratio of C-12 to C-14 in a dead organism as compared to a living organism.
Hence, the correct answer is A that is Only Organism Z is alive, and Organism X has been dead longer than Organism Y.
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Which of the following molecules are isomers? Please look at the picture for reference
Answer:
d
Explanation:
Isomers are molecules that have the same molecular formula(the same number of each atom), but different structural formulas
in this case both have the formula C2H5O
Silver has a resistance of 0.0198 ohms. What voltage would produce a current of 100 amps? ______________
The voltage that would produce the given current is 1.98 V.
Ohm's lawThe voltage that would produce the given current can be determined by applying Ohm's law as shown below;
V = IR
where;
V is the voltage I is the currentR is the resistanceV = 100 x 0.0198
V = 1.98 V
Thus, the voltage that would produce the given current is 1.98 V.
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How does atomic mass relate to the mole?
A: Atomic mass can be used to calculate the molar mass of a sample of a compound or element. The molar mass explains the number of particles in a single mole of the sample. Thus, the molar mass derived from the atomic masses of elements in the compound can be used to convert quantified amounts of a compound into moles.
B: Atomic mass can be used to calculate Avogadro’s number of a sample of a compound or element. Avogadro’s number explains the number of grams in a single mole of the sample. Thus, Avogadro’s number that is derived from the atomic masses of elements in the compound can be used to convert quantified masses into moles of the compound.
C: Atomic mass can be used to calculate Avogadro’s number of a sample of a compound or element. Avogadro’s number explains the number of particles in a single mole of the sample. Thus, Avogadro’s number, derived from the atomic masses of elements in the compound, can be used to convert quantified amounts of a compound into moles.
D: Atomic mass can be used to calculate the molar mass of a sample of a compound or element. The molar mass explains the number of grams in a single mole of the sample. Thus, the molar mass derived from the atomic masses of elements in the compound can be used to convert quantified masses into moles of the compound.
Please Help For Brainliest
Answer: what IS THAT bro what grade are you in
Explanation:
A certain chemical reaction 444 kj releases of heat energy per mole of reactant consumed. Suppose some moles of the reactant are put into a calorimeter (a device for measuring heat flow). It takes of heat energy to raise the temperature of this calorimeter by . Now the reaction is run until all the reactant is gone, and the temperature of the calorimeter is found to rise by . How would you calculate the number of moles of reactant that were consumed
Complete question is;
A certain chemical reaction 444 kj releases of heat energy per mole of reactant consumed. Suppose some moles of the reactant are put into a calorimeter (a device for measuring heat flow). It takes 4.68 J of heat energy to raise the temperature of this calorimeter by 6.9 °C. Now the reaction is run until all the reactant is gone, and the temperature of the calorimeter is found to rise by . How would you calculate the number of moles of reactant that were consumed
Answer:
7.27 × 10^(-5) moles
Explanation:
We are given;
Heat energy = 444 kJ/mol
Final Temperature = 6.9 °C
Heat capacity = 4.68 J/°C
Let's calculate the heat generated from the formula;
Heat generated = heat capacity × final temperature
Heat generated = 4.68 × 6.9 = 32.292 J = 32.292 × 10^(-3) KJ
Now, the number of moles of reactant that were consumed is gotten from;
No_ of moles of rctnt consumed = heat energy generated/heat energy used = (32.292 × 10^(-3))/444 = 7.27 × 10^(-5) moles
How is fluorine purified so that it is stable? If this is the same as how it was first purified, then state that it is.
Answer:
it is the same way it is purified in the state
In the photosynthetic reaction, which event normally occurs before the other three?
A) oxygen release
B) water absorption
C) PGAL synthesis
D) glucose formation
Which of the following options correctly balances the equation below? __HNO2 + __O2 --> __HNO3
Answer:
2HNO2 + O2 ------> 2HNO3
Explanation:
Which statement applies only to magnetic force instead of both electric and
magnetic forces?
A. It can push objects apart.
B. It can pull objects together.
C. It acts between objects that do not touch.
D. It acts between a north pole and a south pole.
SUBMIT
3) (Solid magnesium carbonate mixed in a solution of dilute hydrochloric acid. Assume the
specific heat capacity of the solution is 4.18 J/g°C. The enthalpy of the reaction is -23.4
kJ. If 1950 J of heat are released by this reaction, how many grams of Mgco, were
dissolved?
Answer: The mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.
Explanation:
We are given:
Amount of heat released = 1950 J = 1.950 kJ (Conversion factor: 1 kJ = 1000 J)
The chemical equation for the reaction of magnesium carbonate and hydrochloric acid follows:
[tex]MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2;\Delta H_{rxn}=-23.4kJ[/tex]
By Stoichiometry of the reaction:
If 23.4 kJ of heat is released, then 1 mole of magnesium carbonate is dissolved
So, when 1.950 kJ of heat is released, then = [tex]\frac{1mol}{23.4kJ}\times 1.950kJ=0.083mol[/tex] of magnesium carbonate is dissolved
To calculate the mass of the substance by given number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Moles of magnesium carbonate = 0.083 moles
Molar mass of magnesium carbonate = 84.3 g/mol
Putting values in above equation, we get:
[tex]0.083mol=\frac{\text{Mass of magnesium carbonate}}{84.3g/mol}\\\\\text{Mass of magnesium carbonate}=0.083mol\times 84.3g/mol=6.99g[/tex]
Hence, the mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.
A 0.02 molar solution of sodium chloride contains 0.1 mole of solute. What is the volume of the solution
Answer:
Volume of solution = 5 L
Explanation:
Given data:
Molarity of solution = 0.02 M
Moles of solute = 0.1 mol
Volume of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
by putting values,
0.02 M = 0.1 mol / volume of solution
Volume of solution = 0.1 mol / 0.02 M
Volume of solution = 5 L
Zinc + Hydrogen Chloride
What is proof of a chemical reaction?
Answer:
produces bubbles and hydrogen gas
The proof of a chemical reaction of Zinc + Hydrogen Chloride is that after reaction it produces the hydrogen gas as white fumes.
What is a chemical reaction?When two reactants react in a reaction to form any product which can also be two or three and have some bi-product in the form of fumes or precipitate or any change in color so that we can conclude the results about the reaction.
In chemical reaction of Zinc + Hydrogen Chloride the producta are the zinc chloride and produces the white fumes of hydrogen gas which is a bi-product.
Therefore, it produces the hydrogen gas as white fumes is proof of a chemical reaction of Zinc + Hydrogen Chloride is that after reaction.
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true or false
In order to calculate the relative formula mass for any compound, we sum up the products of atoms of elements multiplied by their relative atomic mass.
Answer:
TRUE
Explanation:
THE ANSWER IS TRUE
HOPE IT HELPS
A mixture is made by combining 1.49 lb of salt and 3.82 lb of water.
What is the percentage of salt (by mass) in this mixture?
Answer:
28%
Explanation:
concentration=(solute mass/solution mass)*100
C=concentration
md-solute mass
ms-solution mass
the solution mass is equal to the sum of the solute and solvent mass
ms=3.82+1.49=5.31lb
c=1.49/5.31 * 100=0.28*100=28%
How many grams of water can be heated 71 °C by the absorption of 970 Joules?
Answer:
m = 3.3 g
Explanation:
Hello!
In this case, since the specific heat of water is defined as 4.184 J(g*°C), given the temperature change and the absorbed energy, we can compute the mass of water as shown below:
[tex]Q=mC\Delta T\\\\m=\frac{Q}{C\Delta T}[/tex]
Thus, we plug in the given data to obtain:
[tex]m=\frac{970J}{4.184\frac{J}{g\°C}*71\°C}\\\\m= 3.3g[/tex]
Best regards!
Which argument best explains the charge of an atomic nucleus? NEED HELP!!!!!!!
A. An atomic nucleus is positively charged because it is composed of neutrons.
B. An atomic nucleus is positively charged because it is composed of protons.
C. An atomic nucleus is negatively charged because it is composed of electrons.
D. An atomic nucleus is negatively charged because it is composed of neutrons.
Answer:
A. An atomic nucleus is positively charged because it is composed of neutrons.
Explanation:
What is the concentration of a solution if 2.0 moles of sodium chloride is dissolved in 0.50 liter of water
4 M is the concentration of a solution if 2.0 moles of sodium chloride is dissolved in 0.50 liter of water.
What is molarity?Molarity is define as the no. of moles of solute present in per liter of solution i.e. M = n / V.
We can calculate the concentration in terms of molarity, in the question given that :
n = no. of moles of NaCl = 2 moles
V = volume of water = 0.50 L
On putting these values in the above equation, we get
M = 2 / 0.50 = 4M
Hence, 4 M is the concentration of the given solution.
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Aqueous hydrobromic acid HBr will react with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O. Suppose 4.05 g of hydrobromic acid is mixed with 2.6 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to 3 significant digits.
Answer:
.70 g of water will be formed.
Explanation:
NaOH + HBr = NaBr + H₂O
40 g 103 g 18 g
40 g of sodium hydroxide reacts with 103 g of HBr
2.6 g of sodium hydroxide reacts with 103 x 2.6 / 40 = 6.7 g of HBr
4.05 g of HBr is available so HBr is limiting reagent .
103 g of HBr reacts with NaOH to form 18 g of water
4.05 g of HBr reacts with NaOH to form 18 x 4.05 / 103 g
= .70 g of water will be formed.
Which of the following best describes an alkali?
A. Any substance with a pH above 7.
B. A soluble solid that forms H+ ions in a solution.
C. A soluble solid that has a pH above 7.
D. An insoluble solid that forms OH-ions in a solution.
Answer:
A. Any substance with a pH above 7.
Explanation:
On the pH scale substances whose value is greater than 7 and less than 14 are termed alkali.
Acids have a pH of less than 7 whereas neutral compounds such as water has pH of 7.
An alkali is any substance that produces excess hydroxyl ion in solutions. Water soluble bases are known as alkali. They are usually certain metallic oxides, metallic hydroxides and aqueous ammonia.Answer:
C A soluble solid that forms H+ ions in a solution
Explanation:
founders ed
Which of the following elements belong to the same pair?
A. Na and CI
B. Na and Li
C. Na and Cu
D. Na and Ne
Answer:
B. Na and Li
Both are group I elements.