Answer:
26.96 kPa
Explanation:
Applying,
PV/T = P'V'/T'............... Equation 1
Where P = Initial pressure, V = Initial volume, T = Initial temperature, P' = Final pressure, V' = Final volume, T' = Final temperature.
make P the subject of the equation
P = P'V'T/VT'.............. Equation 2
From the question,
Given: V = 0.766 L, T = 298 K, P' = 32.6 kPa, V' = 0.644 L, T' = 303 K
Substitute these values into equation 2
P = (32.6×0.644×298)/(0.766×303)
P = 26.96 kPa
Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca^2 , Al^3 ,I^-,S^2-
Answer:
Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca^2 , Al^3 ,I^-,S^2-
Explanation:
1)Formula of calcium iodide:
The compound of Ca^2+ and I^-1:
[tex]CaI_2[/tex]
2) Formula of calcium sulfide:
[tex]CaS[/tex]
3) Formula of aluminum iodide:
[tex]AlI_3[/tex]
4) Formul aluminum sulfide:
[tex]Al_2S_3[/tex]
These are the four ionic compounds that are formed.
PLEASE ANSWER ASAP I WILL GIVE YOU BRAINLIEST AND GIVE FREEE POINTSSS AFTER
Describe each of the following types of reactions and give one example of each: combustion, synthesis, decomposition, single replacement, double replacement.
Explanation:
Combustion Reaction:-A kind of chemical reaction in which a reaction between any combustible substance and an oxidizer takes place in order to form an oxidized product.
Eg: Fuel + O2 → CO2 + H2O.
The burning of charcoal is a combustion reaction.
Synthesis Reaction:-A synthesis reaction occurs when two or more reactants combine to form a single product.
Eg: Na + Cl → NaCl
An example of a synthesis reaction is the combination of sodium (Na) and chlorine (Cl) to produce sodium chloride (NaCl).
Decomposition Reaction:-A decomposition reaction occurs when one reactant breaks down into two or more products.
Eg: NaCl → Na + Cl
An example of a decomposition reaction is the breakdown of Sodium chloride to give sodium and chloride.
Single Replacement Reaction:-A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.
Eg: Zn + 2 HCl → 2 ZnCl + H2
The reaction between zinc metal and hydrochloric acid to produce zinc chloride and hydrogen gas is an example of a single-displacement reaction.
Double Replacement Reaction:-A double replacement reaction is a type of chemical reaction that occurs when two reactants exchange cations or anions to yield two new products.
Eg: AgNO 3 + NaCl → AgCl + NaNO
The reaction between silver nitrate and sodium chloride to produce silver chloride and sodium nitrate is an example of a double-displacement reaction.
3. What do you call the process by which humans extracts stones fron the mountains for
construaction purposes
A pure copper cube has an edge length of 1.76 cm. How many copper atoms does it contain? (volume of a cube = (edge length)^3; density of copper = 8.96 g/cm^3 )
Based on the nature of the reactants in each of the equations below, which reaction at 25°C will occur at the fastest rate?
A
C(s) + O2(g) + CO2 (g)
B
NaOH(aq) + HCl(aq) + NaCl(aq) + H2O(l)
C.
CH3OH( 2) + CH3COOH(e) → CH3COOCH3 (aq) + H2O(l)
D.
CaCO3(s) - CaO(s) + CO2 (g)
Based on the nature of the reactants in each of the equations below, which reaction at 25°C will occur at the fastest rate will be-
NaOH + HCl = NaCl + H₂O and the correct option is option B.
What is reaction rate?The rate of reaction or reaction rate is the speed at which reactants are converted into products. When we talk about chemical reactions, it is a given fact that rate at which they occur varies by a great deal.
Some chemical reactions are nearly instantaneous, while others usually take some time to reach the final equilibrium.
Increasing the surface area of one or more reactants affect the reaction rate of a system will speed up the reaction.
increase the concentration of a reactant will usually speed the reaction rate of a chemical system.
Therefore, based on the nature of the reactants in each of the equations below, which reaction at 25°C will occur at the fastest rate will be-
NaOH + HCl = NaCl + H₂O and the correct option is option B.
Learn more about Reaction rate, here:
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Which of the following is an example of a natural polymer?
a) Wool
Ob) Super Glue
c) Nylon
d) Teflon
please hurry
Answer:
A
Explanation:
because it occurs in nature and all other option are synthesis.
Substance
Number of Protons
Number of
Electrons
2.
3
lithium
fluorine
9
10
19
potassium
sulfur
19
18
16
19. Which substance is electrically neutral?
A. lithium
B. fluorine
Β
C. potassium
D. sulfur
20. Which substance has an overall I'charge?
Answer:
lithium 3
Explanation:
This is because lithium has three protons
Please help
Calculate the sodium ion (Na+) concentration for a 0.812 M Na3PO4 solution.
[Na+]=____M
Explanation:
Correct option is
B
0.750 M
Na3PO4 dissociates as:
Na3PO4⇌3Na++PO43−
∴ conc. of Na+ would be =3×0.250=
hope help
3. If a gas exerts 1.2 atm of pressure at a volume of 31 liters and a temperature of 360K, how many moles of the gas are in the container.
Academic Vocabulary The schools in one area are
often called a school system. What are some of the
components of this system?
Explanation:
Standards.
Assessments.
Accountability.
Professional Development.
School Autonomy.
Parent Involvement.
Learning Readiness.
Technology.
liquid mass has a volume of 9.2 and density of 0.75
Answer:
6.9
Explanation:
Mass(m)=?
Density (D)=0.75
Volume (v)=9.2
M=D×V
M=0.75×9.2
M=6.9
How many grams of gasoline would you need to burn to move your car 2.5 miles which takes 5,375 kJ? (Hrxn= 47kJ/g)
Answer:
1.1 × 10² g
Explanation:
The combustion of gasoline releases energy that is used to move the car. The enthalpy of reaction (ΔH°rxn) of the combustion of gasoline is 47 kJ/g, that is, 47 kiloJoule are produced per gram of gasoline burned. The mass of gasoline to be burned to release 5,375 kJ is:
5,375 kJ × 1 g Gasoline/47 kJ = 1.1 × 10² g
(S)-3-Methylhexane undergoes radical bromination to yield optically inactive 3-bromo-3-methylhexane as the major product. Is the product chiral
Answer:
No, the product is not chiral
Explanation:
The compound (S)-3-Methylhexane is chiral. However, the bromination of this compound via free radical mechanism yields an achiral intermediate as shown in the image attached to this answer.
This achiral intermediate is a flat and planar tertiary radical. Attack on either face of this radical specie is possible. This leads us to obtain a 50-50 mixture of (R) and (S) - 3-bromo-3-methylhexane.
This is a racemic mixture hence it is optically inactive.
propanoyl chloride reacts with LiAlH4, what will be the product
What is exactly the pH value of distilled water?
Determine which of these properties would distinguish these two substances: (a) boiling point; (b) combustion analysis results; (c) molecular weight; (d) density at a given temperature and pressure. You can check on the properties of these two compounds
Answer:
(a) boiling point
(d) density at a given temperature and pressure.
Explanation:
Isomers are compounds that have the same molecular formula but different structural formulas. They differ in chemical and physical properties depending on the type of isomerism displayed by the compounds.
The compounds stated here are structural or constitutional isomers hence they possess different boiling points and densities at a given temperature and pressure owing to structural differences in the molecules.
Since they have the same molecular formula, they must yield the same result during combustion analysis and they must have the same molecular weight.
How many pili are in a bacterial cell
Answer: Bacterial species where observed Typical number on cell Distribution on cell surface
Escherichia coli (common pili or Type 1 fimbriae) 100-200 uniform
Neisseria gonorrhoeae 100-200 uniform
Streptococcus pyogenes (fimbriae plus the M-protein) ? uniform
Pseudomonas aeruginosa 10-20 polar
Explanation:
Pili are structures that extend from the surface of some bacterial cells.
These are hollow, non-helical, filamentous appendages.
Hope it helps you
How many atoms are in 54.4 g of carbon-12?
Answer:
12.00 g C-12 = 1 mol C-12 atoms = 6.022 × 1023 atoms • The number of particles in 1 mole is called Avogadro's Number (6.0221421 x 1023).
Explanation:
carry on learning
Please help me I need help with this questions I’m very confused fused as to what the answer is please
How much aluminum oxide in grams is produced from the reaction of 3.5 moles of oxygen with 4.5 moles of aluminum?
Answer:
The mass of 3.5 moles of Ca is 140 g to two significant figures
6CO2 + 6H20 --> C6H12O6 + 602
What is the total number of moles of CO2 needed to make 2 moles of CH1206?
Answer:
12 mol CO₂
General Formulas and Concepts:
Atomic Structure
CompoundsMolesMole RatioStoichiometry
Analyzing reactions rxnUsing Dimensional AnalysisExplanation:
Step 1: Define
Identify
[rxn] 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
[Given] 2 mol C₆H₁₂O₆
[Solve] mol CO₂
Step 2: Identify Conversions
[rxn] 6CO₂ → C₆H₁₂O₆
Step 3: Convert
[DA] Set up: [tex]\displaystyle 2 \ mol \ C_6H_{12}O_6(\frac{6 \ mol \ CO_2}{1 \ mol \ C_6H_{12}O_6})[/tex][DA] Multiply [Cancel out units]: [tex]\displaystyle 12 \ mol \ CO_2[/tex]Hydrolysis of the compound B5H9 forms boric acid, H3BO3. Fusion of boric acid with sodium oxide forms a borate salt, Na2B4O7. Part A Without writing complete equations, find the mass (in grams) of B5H9 required to form 148 g of the borate salt by this reaction sequence.
Answer:
37.09 g of B₅H₉ is required to form 148 g of borate salt( Na₂B₄O₇ )
Explanation:
Given the data in the question;
B₅H₉ → H₃BO₃ → Na₂B₄O₇
find the mass (in grams) of B5H9 required to form 148 g of the borate salt by this reaction sequence.
S M.W
B₅H₉ 63
H₃BO₃ 62
Na₂B₄O₇ 201
So, moles of Na₂B₄O₇ = 148 / 201 = 0.736
Since Boron will be conserved,
Moles of Boron atoms in Na₂B₄O₇ will be;
⇒ 4 × 0.736 = 2.944
Now, Moles of Boron in Na₂B₄O₇ = Moles of Boron in H₃BO₃ = Moles of Boron in B₅H₉
Hence,
Moles of Boron in B₅H₉ = 2.944
Moles of B₅H₉ = 2.944 / 5 = 0.5888
Mass of B₅H₉ = 0.5888 × 63 = 37.09 g
Therefore, 37.09 g of B₅H₉ is required to form 148 g of borate salt( Na₂B₄O₇ )
how many grams of zinc sulfide are used to produce 1.28 grams of zinc oxide?
Answer:
0.012288122055459
Explanation:
i might be wrong
The acid-base reaction between HCl and NaOH produces a solution with a pH of 7 at the equivalence point (NaCl H2O). Why does an acid-base indicator that changes color at pH 5 or 9 work just as well for this reaction as one that changes color at pH 7
Answer:
Answer is in the explanation.
Explanation:
Before the equivalence point, the pH of the solution of HCl that is titrated with NaOH has a pH <<< 7. When you are adding more NaOH nearing, thus, to the equivalence point the change in pH occurs quickly, and, with 1 drop of excess of NaOH after equivalence, the pH of the solution change to a pH >>> 7
That means the volume added at pH 5 or pH 9 is, almost, the same doing the indicator work just as well as an indicator with change color at pH 7
For each of the scenarios, determine if the ionic strength of the solution would increase, decrease, or not change. Ignore any effects caused by the change in volume.
1) If a solution of HNO3 were added to a solution of KOH , the ionic strength of the KOH solution would:_____.
A. Increase.
B. Decrease.
C. Not change.
2) If a dilute solution of KOH were added to a solution of CaCl2 (Ca(OH)2 (s) is formed), the ionic strength would:____.
A. Increase.
B. Decrease.
C. Not change.
3) If a dilute solution of benzoic acid were titrated with a solution of KOH the ionic strength would:____.
4) If a solution of NaOH were added to a solution of iron(II) chloride, the ionic strength would:____. A. Increase.
B. Decrease.
C. Not change.
Answer:
1) increases
2) decrease
3) increase
4) decrease
Explanation:
When ionic compounds dissolve in water, the concentration of ions in solution increases since ionic substances dissociate into ions in solution. The greater the concentration of ions in a solution, the greater the ionic strength of that solution.
Hence, if HNO3 is added to KOH solution, the ionic strength of the solution is increased due to an increase in the number of ions in the solution.
Also, when benzoic acid is titrated against KOH, potassium benzoate (an ionic substance) is formed thereby increasing the ionic strength of the solution.
However, when KOH is added to CaCl2, a precipitate (Ca(OH)2) is formed. Also, when NaOH is added to FeCl2, a precipitate (Fe(OH)2) is formed. In both cases, the formation of the precipitate decreases the concentration of ions in the solution thereby decreasing the ionic strength of the solution.
Which of the following IS TRUE for covalent bonding?
A. Covalent bonding involves the sharing of electrons
B. Covalent bonding occurs between metals
C. Covalent bonding occurs between non-metals
D. Covalent bonding occurs between atoms with a large electronegativity
difference.
E. Both A and D
F. Both A and C
G. Both C and D
What is the concentration of a solution that has a volume of 2.5 L and contains 660 g of calcium phosphate? (molar mass of calcium phosphate = 310.18 g/mol)
Answer:
0.85 M
Explanation:
Step 1: Given data
Mass of calcium phosphate (m): 660 gVolume of solution: 2.5 LMolar mass of calcium phosphate (M): 310.18 g/molStep 2: Calculate the moles (n) corresponding to 660 g of calcium phosphate (solute)
We will use the following expression.
n = m/M
n = 660 g/(310.18 g/mol) = 2.13 mol
Step 3: Calculate the molar concentration (molarity) of the solution
Molarity is equal to the moles of solute divided by the liters of solution.
M = 2.13 mol/2.5 L = 0.85 M
At 1115 degrees Celcius, where iron is still a solid (melting point 1538 degrees Celcius), the unit cell for the most stable crystal lattice of the metal is face- centered cubic (fcc) with an edge length of 362 pm. What is the atomic radius of iron at this temperature?
Answer: The atomic radius of iron is 128 pm.
Explanation:
To calculate the radius of the metal having FCC crystal lattice, the relationship between edge length and radius follows:
[tex]4r=\sqrt{2}a[/tex]
Where,
a = edge length = 362 pm
r = atomic radius of iron = ?
Plugging values in above equation, we get:
[tex]r=\frac{\sqrt{2}\times 362}{4}\\\\a=128pm[/tex]
Hence, the atomic radius of iron is 128 pm.
If one of your samples had a mass of 25.62 g and a volume of 21.9 cm3, would this sample also be the same material you have been working with
Answer:
If the density of the material is equal to the density of the material you have been working with it is possible that the samples are the samples
Explanation:
Density is an intensive property of the matter (Doesn't depends of its amount) that is widely used to identify a substance. Density is the ratio between the mass of the substance (In this case 25.62g) and the volume this amount occupies (21.9cm³). The density is:
25.62g / 21.9cm³ =
1.17g/cm³.
If the density of the material is equal to the density of the material you have been working with it is possible that the samples are the samplesUse the following balanced equation to answer the questions below.