Answer:
The factor of change is 1/4.
Explanation:
Since in this case we have a constant temperature, the changes in the pressure will affect the volume like the Boyle's Law formula explains:
[tex]\begin{gathered} P_1*V_1=P_2*V_2 \\ \end{gathered}[/tex]To find the change of the sample volume, let's replace the initial pressure (P1) with A, and let's increase the pressure (P2) 4x:
[tex]\begin{gathered} P_1*V_1=P_2*V_2 \\ A*V_1=(A*4)*V_2 \\ \frac{A*V_1}{A*4}=V_2 \\ \frac{1}{4}V_1=V_2 \end{gathered}[/tex]So, the factor of change is 1/4.
Match the reaction to the type that best describes it.NaBr + KF → NaF+ KB?Combination2Cu + MnCl2 →Mn + 2Cuci?DecompositionC + 2H2 → CH4?Single replacementCO2 + O2 + c?Double replacement
Answer:
[tex]\begin{gathered} a:\text{ Double Displacement} \\ b:\text{ Single Replacement} \\ c:\text{ Combination} \\ d:\text{ Decomposition} \end{gathered}[/tex]Explanation:
Here, we want to get the type of reactions listed
We proceed to evaluate the reactions one after the other:
a) This is a double replacement reaction. It usually occurs when molecules exchange ions in the course of their reaction leading to replacement in a molecule by an ion or a group of ions in the other molecule
b) This is a single replacement reaction which in other words could be referred to as a displacement reaction. This occurs usually when a metallic solid reacts with a solution of the salt of less reactive metal
c) This is a combination reaction. It is usually useful in the laboratory and industrial synthesis of some molecules
d) This is a decomposition reaction. It occurs when a particular molecule splits into the constituent molecules that make it up
List the following aqueous solutions in order of increasing melting point. (The lastthree are all assumed to dissociate completely into ions in water.)(a) 0.1 m sugar(b) 0.1 m NaCl(c) 0.08 m CaCl2(d) 0.04 m Na2SO4
0.1M sugar < 0.1 M NaCl < 0.08M CaCl2 < 0.04 M Na2SO4
Explanations:First we must understand that the higher thecnoncentration of a compound, the lower the melting point. This shows that 0.04 m Na2SO4 will have highest melting point followed by 0.08 M CaCl2
Since 0.1M of sBgar and 0.1M of NaCl have the same molarity, we will determine the effect of solute and ionic bonding between compound on melting point. Since common salt (NaCl) is made up of stronger ionic bonds, it will have higher melting point than sugar.
The increasing order of their melting point wile be 0.1M sugar < 0.1 M NaCl < 0.08M CaCl2 < 0.04 M Na2SO4
With all the steps please:A solution is prepared by dissolving 166.0 g of potassium iodide, Kl, in water to a total volume of 1,000 mL. Calculate the molarity of this solution.
Explanation:
Molarity, or concentration in amount of matter (mol/L), is the ratio between the amount of matter in the solute (n) and the volume of the solution in liters (V): M = n/V
Here we have:
m = 166 g of KI (solute)
V = 1000 mL = 1L (solution)
So we need to transform 166 g of KI into moles. We use the following formula:
n = m/MM
MM of KI is 166 g/mol
n = 166/166
n = 1 mol
So:
M = 1/1
M = 1 mol/L
Answer: M = 1 mol/L
What is the frequency of light having a wavelength of 843 nm?Speed of light 3.00x10^8
Explanation:
Frequency and wavelength are inversely proportional to each other. The equation that relates them is:
f = c/λ
Where f is the frequency, λ is the wavelength and c is the speed of light.
f = ? λ = 843 nm c = 3.00 * 10^8 m/s
Before we replace these values into the formula we have to convert the wavelength from nm to m.
1 m = 1 * 10^9 nm
λ = 843 nm = 843 nm * 1 m/(1 * 10^9 nm)
λ = 8.43 *10^(-7) m
Finally we can replace the values into the equation and get the answer to our problem.
f = c/λ
f = (3.00 * 10^8 m/s)/( 8.43 *10^(-7) m)
f = 3.56 * 10^14 1/s
f = 3.56 * 10^14 Hz
Answer: the frequency of the light is 3.56 * 10^14 Hz
estion 21 of 30hat types of bonds and atoms are in the molecule shown below?HH1H-C-C=C-C-H||||HHHHOA. Single bonds, double bonds, carbon atoms, and hydrogen atomSingle bonds double bonds and only carbon atoms
According to the given picture, in the molecules there are single bonds, double bonds, carbon atoms and hydrogen atoms. It means that the correct answer is A.
What amount (moles) is represented by each of these samples?b. 10.0 mg NO2c. 1.5 3 1016 molecules of BF3
To find the amount represented by 1.5x10^16 molecules of BF3 we have to use Avogadro's Number. It was stated that 1 mol of any substance contains 6.022x10^3 atoms or molecules of that substance, that is what we know as Avogadro's Number:
[tex]1.5\times10^{16}molecules\cdot\frac{1mol}{6.022\times10^{23}molecules}=2.5\times10^{-8}mol[/tex]The answer is 2.5x10^-8 moles of BF3.
You are given a bulb, one metre copper wire, a switch and a battery. How could you use them to distinguish the samples of metals and non-metals? Write the usefulness of this test in distinguishing metals and non-metals.
With the given materials following experiment can be done
Electrical conductivity test:
Metals are good conductors of electricity, therefore when you join metals with a battery, wire, and bulb, you get a bulb.
Similarly, if nonmetals are poor electrical conductors, they may not ignite the bulb when attached to a wire and a battery.
Generally, the above method can be used to identify metals and non-metals. But there are some exceptions also,. Graphite, an allotrope of non-metal carbon, is a good conductor of electricity.
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The periodic chart has many different types of elements. Some elements are metals, some are nonmetals, and yet others are metalloids. Therefore, by electrical conductivity test, we can detect metal and non metal.
What is metal ?Metals are hard, conduct electricity, are ductile, lustrous, and malleable materials.
Since metals have free electrons that's why they can conduct electricity. Since atoms in metals are very closely packed in a definite crystal solid. It is not brittle that is it can not be broken down easily.
Metals carry electricity well, therefore when you combine metals with a battery, wire, and bulb, you get a light. Similarly, if nonmetals are poor electrical conductors, when connected to a wire and a battery, they may not light the bulb.
Therefore, by electrical conductivity test, we can detect metal and non metal.
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What is the net ionic equation for the reaction between HCL(aq) and NaHCO3(aq)
We have to write the net ionic equation for the reaction between HCl and NaHCO₃.
The molecular equation will show us the products of this equation.
Molecular equation:
HCl (aq) + NaHCO₃ (aq) ------> NaCl (aq) + CO₂ (g) + H₂O (l)
Now we can split this compounds into their ions to get the total ionic equation:
Total ionic equation:
H+ (aq) + Cl- (aq) + Na+ (aq) + HCO3- (aq) ----> Na+ (aq) + Cl- (aq) + CO₂ (g) + H₂O (l)
And finally we can identify the spectator ions. The ones that we have on both sides, they are Na+ and Cl-. We can cancel them out.
Net ionic equation:
H+ (aq) + HCO3- (aq) ----> CO₂ (g) + H₂O (l)
Answer: H+ (aq) + HCO3- (aq) ----> CO₂ (g) + H₂O (l)
Naming compoundsPb3(AsO4)4
ANSWER
Lead (IV) Arsenate
STEP-BY-STEP EXPLANATION:
The compound consists of two elements which are; Lead and Arsenic, and oxygen
Combination off oxygen and Arsenic gives Arsenate
The name of the compound is Lead (VI) Arsenate
Lead is listed below zinc in the activity series.
What will most likely happen when zinc particles are placed in lead nitrate solution? (1 point)
Zinc lead will form.
Oxygen will evolve.
No reaction will occur.
Zinc nitrate will form.
zinc nitrate and solid lead most likely happen when zinc particles are placed in lead nitrate solution
[tex]Pb(NO_3)_2aq.+Zn(s)= Zn(NO_3)_2(aq.)+Pb(s)[/tex]
Without the chemical element zinc (Zn), which is one of the most extensively used metals and is a member of Group 12 (IIb, or the zinc group) of the periodic table, life would not be possible. Zinc has important business implications.
The average amount of zinc in the Earth's crust per tonne is 65 grams (2.3 ounces), which is a little more than copper. Nearly all of the world's zinc ore is composed of the principal zinc mineral sphalerite and its oxidation byproducts, smithsonite and hemimorphite. Australia, New Zealand, and the US are said to have discovered native zinc resources. China, Australia, and Peru are the top three producers of zinc in the beginning of the twenty-first century.
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Give an example of heat energy out vs. heat energy in during chemical reaction
An exothermic reaction is a reaction that releases energy. One example of this type of reaction is burning gas in a gas oven.
An endothermic reaction is a reaction that absorbs energy. One example of this type of reaction is
Solutions are:Group of answer choicesPure substancesHomogeneous mixturesHeterogeneous mixturesAlways water-based
ANSWER
Solutions are homogenous mixtures
EXPLANATION
A solution is a mixture that contains two or more substances in the right proportions.
Solution = solute + solvent
The solution is always a homogenous mixture because the substances are mixed in the right proportion
Hence, solutions are homogenous mixtures
) What is the most notable difference between particles in the solid phase and the liquid phase?
Answer: Particles in the solid phase are tightly compact and they vibrate, while particles in the liquid phase move freely, randomly, and with more room to move
Explanation:
QUESTION 16What is the empirical formula that corresponds to a compound that contains 57.69% C, 11.54% H, and 30.77% O by mass?O C5H1202O C2.5H6OC3H1202O C58H12031С6HO3
Answer
[tex]C_5H_{12}O_2[/tex]Explanation
Given:
57.69% C, 11.54% H, and 30.77% O by mass,
Meaning:
Mass of carbon = 0.5769 g
Mass of Hydrogen = 0.1154 g
Mass of Oxygen = 0.3077 g
We know:
Molar masses of:-
C = 12.0107 g/mol
H = 1.00794 g/mol
O = 15.999 g/mol
Required: Empirical formula
Solution:
Step 1: Calculate the number of moles of the 3 atoms
C : 0.5769 g/12.0107 g/mol = 0.04826 mol
H : 0.1154 g/1.00794 g/mol = 0.1145 mol
O : 0.3077 g/15.999 g/mol = 0.0192
Step 2: Divide the moles by the lowest number of moles
In this case divide by 0.0192
C: 2.5
H: 6
O:1
Step 3: multiply by 2 to remove a decimal
C: 5
H: 12
O:2
Therefore the answer is: C5H12O2
Finish the following equations and list whether they will occur need one product to be insoluble. CuSO4 + Na2CO3 -->
The reaction will occur.
[tex]CuSO_{4}+Na_{2}CO_{3}\operatorname{\rightarrow}Na_{2}SO_{4}+CuCO_{3}[/tex]Explanations:The given chemical reaction is a double displacement reaction. In this reaction, the compoiunds will react to produce two different compounds.
The balanced form of the reaction is expressed as:
[tex]CuSO_4+Na_2CO_3\rightarrow Na_2SO_4+CuCO_3[/tex]You can see that the reaction of cupper(II)sulphate and sodium carbonate produces sodium sulphate and copper(II)carbonate
Since most carbonate compounds are insoluble, hence the reaction will occur
A sample of 63.6 grams of copper completely reacted with oxygen to form 71.6 grams of a copper oxide product. How many grams of oxygen must have reacted?
Let us first illustrate the reaction of Copper and Oxygen
• 2Cu +O2 → 2CuO
ratioon > 2 : 1
step 1 : determine moles of Cu and O2 .
(i) Moles Cu = mass Cu/Molar Mass Cu
= 63.6 g/ 63.546g/mol
=1.001 mol
(ii) moles O2 = mass Oxygen/Molar Mass Oxygen
= 71.6/32
= 2.238mol
Step 2 :
Experimental moles of Cu : O2
1.001moles : 2.238moles
take note that excess reactant is O2 and limiting reactant is Cu
Therefore moles of Oxygen that reacted = 1/2 moles of Cu
= 1/2 * 1.001 = 0.5moles
Mass of Oxygen reacted =0.5* 32 (oxygen Molar mass)
=16.01g
This means that 16.01 grams of Oxygen reacted , this value is not in the options provi
if you have 3.2 moles of copper how many moles of sodium iodide are required Nal+Cu=Cul2+Na
Step 1 - "reading" the chemical equation
The given chemical equation is:
[tex]\text{NaI}_{(s)}+Cu_{(s)}\to\text{CuI}_{2(s)}+Na_{(s)}[/tex]The proportion in moles for any chemical equation is given by the "bigger" numbers, those that come before the formula of the substances. We can use them to "read" what the equation is telling us:
1 mole of NaI react with 1 mole of Cu thus producing 1 mole of CuI2 and 1 mole of Na
Since the exercise has specifically asked us about the proportion between sodium iodide (NaI) and copper (Cu), we can simplify the statement to:
1 mole of NaI react with 1 mole of Cu
Therefore, we always need the same quantitie, in moles, of NaI and Cu for this reaction to occur completely.
Step 2 - Discovering how many moles of sodium iodide are required
Since the proportion between NaI and Cu, as we saw, is 1:1 in moles, whenever we use, let's say, x moles of Cu, we will need x moles of sodium iodide as well.
Therefore, the amount needed of sodium iodide would be exactly 3.2 moles.
Arrange in order of increasing ionization energy. (Use the appropriate <, =, or > symbol to separate substances in the list.)
Explanation:
The 3 elements are As, Ga, and Se.
Please, look at the next picture:
According to the 2 pictures above, the right arrangement will be:
Ga < As < Se
Ga has the lowest ionization energy and Se has the highest ionization energy.
Answer: Ga < As < Se
.calculate amount of heat required to rais the temperature of 50 g og copper by 70 K? (specific heat of copper is 0.385 J/g.K.
To determine the heat required (Q) to increase the temperature of a substance we can apply the following equation:
[tex]Q=mCp\Delta T[/tex]where,
m is the mass of the substance, 50g
Cp is the specific heat of the substance, 0.386J/g.K
deltaT is the temperature difference, 70K
Now, we have the values we need to calculate the heat required, we replace the known data into the equation:
[tex]Q=50g\times0.385\frac{J}{g.K}\times70K=1347.5J[/tex]The heat required to raise the temperature of 50 g of copper by 70 K will be 1347.5J
Calculate the molarity of a solution made by adding 150.0 mL of water to 85.00 mL of a 0.157 M solution
Answer:
0.089 M
Explanation:
M1V1=M2V2
Total volume = 150 ml + 85 ml = 235ml
0.157(.085 L) = M2(.235L)
M2 = 0.05678723404 or 0.057 M
4. __H2SO4 + __Cr(OH)3 --> __Cr2(SO4)3 + __H2OYou have 4 moles of H2SO4. How many moles of H2O are produced?
The number of moles of H2O produced when 4 moles of H2SO4 are there is 8 moles of H2O
The reaction is __H2SO4 + __Cr(OH)3 --> __Cr2(SO4)3 + __H2O. The reaction is as follows;
2Cr(OH)3 + 3H2SO4 → Cr2(SO4)3 + 6H2O
3 moles of H2SO4 produces 6 moles of H2O
1 mole of H2SO4 produces 2 moles of H2O
4 moles of H2SO4 produces 8 moles of H2O
The unitary method is the method used to find the value of a single unit using the value.The number of moles is the given mass by molecular mass.n=m/Mn,m,M is the number of moles, given mass, molecular mass respectivelyTo learn more about moles visit:
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Need help with chemistry 52.3 g of metal at a temperature of 126.2°C are placed in 71.2 g of water which abs an into Al temperature of 24.5°C. The final temperature of the metal and water is 35.5°C. What is the specific heat of the metal in units of J/g°C? Use 4.184 J/g°C for this problem?
Answer:
The specific heat of the metal is 0.69 J/g°C.
Explanation:
The given information from the exercise is:
• Metal,:
- Mass (massmetal): 52.3g
- Initial temperature (Tinitialmetal): 126.2°C
- Final temperature (Tfinalmetal): 35.5°C
• Water,:
- Mass (masswater):71.2g
- Initial temperature (Tinitialwater): 24.5°C
- Final temperature (Tfinalwater): 35.5°C
1st) It is necesary to write the Heat formula for both materials, the metal and water. In the case of water, we can solve the formula, because we have all the nedeed information:
• Metal,:
[tex]\begin{gathered} Q_m=m_{metal}*c_{metal}*(T_{fmetal}-T_{imetal}) \\ Q_m=52.3g*c_{metal}*(35.5_\degree C-126.2\degree C) \\ Q_m=-4,743.61g\degree C*c_{metal} \\ \end{gathered}[/tex]Water:
[tex]\begin{gathered} Q_w=m_{water}*c_{water}*(T_{fwater}-T_{\imaginaryI water}) \\ Q_w=71.2g*4.184\frac{J}{g\degree C}*(35.5\degree C-24.5\degree C) \\ Q_w=3,276.9J \end{gathered}[/tex]So, the heat absorbed by the water is 3,276.9 J.
2nd) In the end both materials reach the equilibrium temperature, because the heat released by the piece of metal is absorbed by the water, this is represented as:
[tex]-Q_m=Q_w[/tex]Finally, we have to replace the heat of the metal equation (Qm) and the heat of water (Qw) to calculate the specific heat of the metal:
[tex]\begin{gathered} -Q_{m}=Q_{w} \\ -(-4,743.61g)\degree C*c_{metal}=3,276.9J \\ 4,743.61g\degree C*c_{metal}=3,276.9J \\ c_{metal}=\frac{3,276.9J}{4,743.61g\degree C} \\ c_{metal}=0.69\frac{J}{g\degree C} \end{gathered}[/tex]So, the specific heat of the metal is 0.69 J/g°C.
For a 4s orbital ,what are the possible values of n, l and ml.
In order to know the values of the quantum numbers n, l and ml for al s4 orbital we go to a quantum table:
And as we can see to de 4s orbital correspond only the values:
n=4
l=0
ml=0
Select the structure that correspondsto the name:pentanoic acidA. CH3CH₂CH₂CH₂COOHB.C. bothCOOH
Answer
C. both
Explanation
Structures in option A and option B both corresponds to the name: pentanoic acid.
The correct answer is C. both
How many grams of FeSO4 (molar mass = 151.9 g/mol) are present in a 200.0 mL sample of a 0.250 M solution? Enter your answer with 3 significant figures and do not include the unit
7.60grams
Explanations:The formula for calculating the molarity of a solution is expressed as;
[tex]molarity=\frac{mole}{volume}[/tex]Given the following parameters
molarity of solution = 0.250M
volume of sample = 200mL
Substitute to determine the mole of the solute
[tex]\begin{gathered} mole\text{ of }FeSO_4=molarity\times volume \\ mole\text{ of }FeSO_4=\frac{0.250mol}{L}\times0.2L \\ mole\text{ of }FeSO_4=0.05moles \end{gathered}[/tex]Determine the required mass of FesO4
[tex]\begin{gathered} Mass\text{ of FeSO}_4=mole\times molar\text{ mass} \\ Mass\text{ of FeSO}_4=0.05\times151.9 \\ Mass\text{ of FeSO}_4=7.595grams \\ Mass\text{ of FeSO}_4=7.60grams \end{gathered}[/tex]Hence the mass of FeSO4 is 7.60grams
Which solution has the highest boiling point?A. 0.1 m CH4N₂OB. 0.06 m HCIC. 0.05 m CaCl2D. 0.04 m (NH4)3PO4E. 0.07 m NaCl
Answer
D. 0.04 m (NH4)3PO4
Explanation
Boiling point elevation depends on the solvent, of course, but we're assuming water, and upon the concentration of the solute and how many particles into which the solute breaks. Colligative properties like boiling point elevation, depend on the total number of particles in solution. The solvent used here is water. So elevation in boiling point will be above a boiling point of water for all solutions.
ΔT= i x Kb x m,
Where i = van Hoff's factor, Kb = boiling point elevation constant of water = 0.512, m = molality
Higher ΔT will have a higher boiling point.
For 0.1 m CH4N₂O,
i = 1
ΔT = 1 x 0.512 x 0.1 = 0.0512
For 0.06 m HCI;
i = 2
ΔT = 2 x 0.512 x 0.06 = 0.06144
For 0.05 m CaCl2
i = 3
ΔT = 3 x 0.512 x 0.05 = 0.0768
For 0.04 m (NH4)3PO4;
i = 4
ΔT = 4 x 0.512 x 0.04 = 0.08192
For 0.07 m NaCl
i = 2
ΔT = 2 x 0.512 x 0.07 = 0.07168
0.04 m (NH4)3PO4 has the highest ΔT.
Therefore, the solution that has the highest boiling point would be D. 0.04 m (NH4)3PO4.
Calculate the mass of 124.50 cm³ of titanium (density = 4.540 g/cm³).
Give your answer to four significant figures
Mass=____g
Mass of titanium having density 4.540 g/cm³) is 565.2g
What are significant figures?
Significant figures are those digits in a number that are meaningful in terms of precision and accuracy. The larger the number of significant figures obtained in a measurement, greater is the accuracy of the measurement and vice-versaRules for calculating significant figures:
When adding or subtracting, round the answer to the least number of decimal placesex: 1.457 + 83.2 = 84.657 , rounds to 84.7
When multiplying or dividing , round the answer to the least number of significant figuresex: 4.36 * 0.00013 = 0.0005668 , round to 0.00057
here, density = mass/ volume
mass = density * volume
= 4.540 * 124.50
= 565.23
Value of density has 4 significant figures and value of volume has 5 significant figures. so we choose density, since it has least significant figures and round to 4 digits.
We get, 565.2g as the mass of titanium
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What is the molarity of a solution that contains 98 g of H2SO4 in 0.05 L of solution?
Answer
20 mol/L
Explanation
Given:
Mass of H₂SO₄ = 98 g
Volume = 0.05 L
From the Periodic Table; Atomic mass (H = 1.0 g, O = 16.0 g, S = 32.0 g)
What to find:
Molarity of the solution.
Step-by-step solution
Step 1: Convert the given mass of 98 g to mole.
The formula to determine the mole is given by:
[tex]\text{mole }=\frac{Mass}{Molar\text{ mass}}[/tex]Molar mass of H₂SO₄ = (2 x 1.0 g) + 32.0 g + (4 x 16.0 g) = 98 g/mol
So mole is
[tex]\text{Mole }=\frac{98\text{ g}}{98\text{ g/mol}}=1.0\text{ mol}[/tex]Step 2: Determine the molarity
The molarity formula is given by:
[tex]\text{Molarity }=\frac{Mole}{Volume\text{ in L}}=\frac{1.0\text{ mol}}{0.05\text{ L}}=20\text{ mol/L}[/tex]Which of the following is a measure of the amount of space that an object occupies?MassVolumeDensityWeight
Step 1 - Understanding the definition of each term
Mass: it measures the amount of matter of a body
Volume: it measures the space occupied by a body
Density: it's the mass divided by the volume
Weight: it is an indirect measure of the mass, since it also includes the action of gravity
Step 2 - Answering the exercise
As we can see, the definition that fits what is being asked is volume.
Answer: volume
Allen wakes up one morning to find that all of the cortical (compact) bone in his body has been replaced by trabecular (spongy)
bone. What changes will there be in the density, strength, and flexibility of his bones?
Its thickness, hardness, and flexibility of the bones will alter, becoming less dense, stronger, and more flexible.
What type of bone is trabecular bone?Trabecular or bone graft refers to the porous, spongy-appearing interior of bones, particularly vertebra and the ends of long bones. Compared to cortical bone, it has a larger surface area and undergoes more active remodeling.
Why is trabecular bone important?As the primary load-bearing bone in vertebral column and the bone that transfers stress from the joints to the cancellous bone in long bones, trabecular bone's elastic behavior must be studied. Additionally, it impacts the bone structure's strength and the fracture risk.
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