Answer:
Below 7
Explanation:
The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of reactants have been mixed(Wikipedia).
For a strong acid-weak base titration, the pH at the equivalence point is usually below 7. This owes to the fact that a conjugate acid is produced in the course of the reaction which interacts with water to produce hydronium (H3O+) ions.
Answer:
7
Explanation:
i did my research and from what i found its 7.
117 milligrams (mg) of purified product was isolated from a chemical reaction. This experimental yield of product represents a 89.0% yield for the reaction. Calculate the theoretical yield, in milligrams (mg), for this reaction. Enter your answer as digits only, no units, using the proper number of significant figures.
Answer:
131 mg
Explanation:
Percent yield = 89%
Actual yield = 117 mg
Percent yield is given by
[tex]\text{Percent yield}=\dfrac{\text{Actual yield}}{\text{Theoretical yield}}\times 100\\\Rightarrow 89=\dfrac{117}{\text{Theoretical yield}}\times 100\\\Rightarrow \text{Theoretical yield}=\dfrac{117}{89}\times 100\\\Rightarrow \text{Theoretical yield}=131.46\approx 131\ \text{mg}[/tex]
The theoretical yield, for this reaction is 131 mg.
Choose all the answers that apply.
What does the cardiovascular system do?
transports oxygen and carbon dioxide for the respiratory system
carries nutrients for the digestive system
works with the immune system to fight infection
carries hormones for the endocrine system
sends nerve impulses to the brain and spinal cord
Answer:
All of the above. The CV system transports blood and plasma the do all 4.
please help. im freaking out rn. i have like 40 missing assignments please
Answer:
I'm pretty sure its the one that says very little at the beginning but if I get it wrong I'm sorry
I haven’t shifted before I tried like once a few months ago and I keep wanting to shift and last night I had a dream I did is that a sign? I mean where I shifted it was to my friend in Australia so not Hogwarts or Marvel
How much energy would it take to heat a section of the copper tubing that weighs about 665.0 g, from 15.71 ∘C to 27.09 ∘C ? Copper has a specific heat of 0.3850 (J/g)⋅∘C.
Answer:
2914 J
Explanation:
Step 1: Given data
Mass of the copper tubing (m): 665.0 gInitial temperature: 15.71 °CFinal temperature: 27.09 °CSpecific heat of copper (c): 0.3850 J/g.°CStep 2: Calculate the temperature change
ΔT = 27.09 °C - 15.71 °C = 11.38 °C
Step 3: Calculate the energy required (Q)
We will use the following expression.
Q = c × m × ΔT
Q = 0.3850 J/g.°C × 665.0 g × 11.38 °C
Q = 2914 J
Fill the plastic cup half full with room-temperature water, and drop in the whole tablet. Use a stopwatch to measure how long it takes the tablet to dissolve completely. Record your observation.
Answer:
it bubbles up and has a chemical reaction also releases co2
Explanation:
Hope it helps <3
What key assumption of Bohr’s model would a Solar S y stem model of the atom violate? What was the theoretical basis for this assumption?
Answer:
See explanation
Explanation:
The solar system consists of the sun at the core surrounded by all the planets in their proper order. Similarly, the Bohr model of the atom upholds Rutherford's planetary model in which the atom was said to have a positive core surrounded by electrons moving in orbits just as the planets orbit round the sun.
The difference between the two models is that electrons are able to move from one energy level to another. This assumption violates the principles of the solar system because the position of the planets are fixed in their orbits.
The theoretical basis behind this assumption is that each spectral line is produced by the transition of electrons from one energy level to another.
Convert 9.24 x 1023 molecules CO2 to moles
1.53 mol CO₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
9.24 × 10²³ molecules CO₂
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 9.24 \cdot 10^{23} \ molecules \ CO_2(\frac{1 \ mol \ CO_2}{6.022 \cdot 10^{23} \ molecules \ CO_2})[/tex]Multiply/Divide: [tex]\displaystyle 1.53437 \ mol \ CO_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.53437 mol CO₂ ≈ 1.53 mol CO₂
What is the definition of lava?
Answer:
Lava, magma (molten rock) emerging as a liquid onto Earth's surface. The term lava is also used for the solidified rock formed by the cooling of a molten lava flow.
Explanation:
Which statement is true about the speed of light? (2 points) Light travels relatively slowly. Distance in space is measured using the speed of light. Time in space is measured using the speed of light. The speed of light is unknown.
Distance in space is measured using the speed of light.
Answer:
Distance in space is measured using the speed of light.
Explanation:
I took the test
can u bang a teacher in class
Answer:
Explanation:
Feel free to bang me- your teacher
Answer:
depends lol
Explanation:
What is the name of the compound O7I9
Answer:
question not clear can u rewrite
How many grams of a nonelectrolyte (78.2 g/mol) must be dissolved in 1 kg of solvent to obtain a freezing point of solution of 1.57ºC? The freezing point of the pure solvent is 4.72ºC and the freezing point depression constant of the solvent is 3.89 ºC/m
Answer Tu mama por si acaso
Explanation:
jkand
A gas sample of 5 moles, has a volume of 95 L. How many moles of the same gas should I add to obtain a volume of 133 L at the same temperature and pressure.
1.5.2
(CST): Computer-Scored Unit Test
Question 2 of 25
What is the molality of a solution made by dissolving 6 moles of NaOH in 3 kg
of water?
A. 0.5 mol/kg
B. 3 mol/kg
C. 0.33 mol/kg
D. 2 mol/kg
The molality of a solution : m = 2 mol/kg
Further explanationGiven
6 moles of NaOH
3 kg water
Required
The molality
Solution
Molality shows the number of moles dissolved in every 1000 grams of solvent( 1 kg solvent)
m = n. (1000 / p)
m = Molality
n = number of moles of solute
p = Solvent mass (gram)
Input the value :
m = 6 moles : 3 kg
m = 2 mol/kg
5. Which model shows the progression of the movement of particles from fastest to slowest as thermal energy is removed?
Answer:
A nivel microscópico y en el marco de la Teoría cinética, es el total de la energía cinética media presente como el resultado de los movimientos aleatorios de átomos y moléculas o agitación térmica, que desaparecen en el acto.
Explanation:
esoes
Please match the correct type of reaction to its name.
what are the two main products of photosynthesis
Answer:
glucose and oxygen gas
Explanation:
oxygenglucose Photosynthesis produce carbon dioxide and water It recombine them to produce oxygen (O2) and a form of sugar called glucose (C6H12O6).A chemistry student needs 50.0ml of tetrahydrofuran for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of tetrahydrofuran is . Calculate the mass of tetrahydrofuran the student should weigh out. Be sure your answer has the correct number of significant digits.
Answer:
44.45 g of tetrahydrofuran.
Explanation:
From the question given above, the following data were obtained:
Volume of tetrahydrofuran = 50 mL
Density of tetrahydrofuran = 0.889 g/mL
Mass of tetrahydrofuran =?
Density of a substance is simply defined as the mass of the substance per unit volume of the substance. Mathematically, density is expressed as shown below:
Density = mass / volume
With the above formula, we shall determine the mass of tetrahydrofuran needed. This can be obtained as follow:
Volume of tetrahydrofuran = 50 mL
Density of tetrahydrofuran = 0.889 g/mL
Mass of tetrahydrofuran =?
Density = mass / volume
0.889 = mass / 50
Cross multiply
Mass = 0.889 × 50
Mass of tetrahydrofuran = 44.45 g
Therefore, the student should weigh out 44.45 g of tetrahydrofuran.
Ethanol, the alcohol in alcoholic beverages, has a density of 0.7893 g/mL. What is the shipping weight of a 5.0-gallon container of pure ethanol if the bottle weighs 1.82 lb and the shipping container and packaging weigh 0.76 lb
Answer:
16.09 kg
Explanation:
To solve this problem first we convert those 5.0 gallons of ethanol into liters:
5.0 gallons * [tex]\frac{3.78L}{1gallon}[/tex] = 18.9 LNow we calculate the mass of that volume of ethanol, using its density:
We convert 18.9 L ⇒ 18.9 * 1000 = 18900 mL
Mass = Density * VolumeMass = 0.7893 g/mL * 18900 mL = 14917.77 gFinally we convert the masses of the bottle and shipping container and packaging and add them to the mass of ethanol:
1.82 lb * 453.592 = 825.54 g0.76 lb * 453.592 = 344.73 gTotal Mass = 14917.77 g + 825.54 g + 344.73 g = 16088.04 gSo the shipping weight would be 16088.04 g, or 16.09 kg
At the end of the reaction, an aqueous solution of sodium bisulfite is added to the reaction mixture. The sodium bisulfite destroys the remaining bromine. Also, the fact that the sodium bisulfite is in water helps to further separate the reaction solvent from the product because the solvent is very soluble in water. What is the most important intermolecular force that allows the solvent to dissolve in wate?
Answer:
Polarity.
Explanation:
The most important intermolecular force to allow a solvent to dissolve in water is polarity. This is because water is a polar substance and there is a chemical law that states that there is only solubility between substances of equal polarity. Thus, water is only able to dissolve a polar substance, just like it. In this case, we can say that the equal polarity between the two solvents is the most important for one to be able to dissolve the other.
What is the term for the chemical reaction that makes soap?
Answer: soaps are a sodium or potassium salts of long chain fatty acids.when triglycerides in fat/oil react with aqueous NaOH or KOH,they are converted into soap and glycerol.This is called alkaline hydrolysis of esters.Since this reaction leads to formation of soap, it is called the saponification process.
Explanation:
Which of the following properties do solids and liquids have in common?
definite volume
definite temperature
definite smell
definite shape
Answer:
definite volume
Explanation:
Both solids and liquids have a definite volume: The difference is that solids have definite shape while liquids do not -liquids take the shape of their containers-.
Having a definite volume is why liquids cannot be compressed, a property that is used in hydraulic systems.
How many grams of sulfur must be burned to give 100.0 g of So2
Answer:
50 g of S are needed
Explanation:
To star this, we begin from the reaction:
S(s) + O₂ (g) → SO₂ (g)
If we burn 1 mol of sulfur with 1 mol of oxygen, we can produce 1 mol of sulfur dioxide. In conclussion, ratio is 1:1.
According to stoichiometry, we can determine the moles of sulfur dioxide produced.
100 g. 1mol / 64.06g = 1.56 moles
This 1.56 moles were orginated by the same amount of S, according to stoichiometry.
Let's convert the moles to mass
1.56 mol . 32.06g / mol = 50 g
If you combine 300.0 mL of water at 25.00 ∘C and 140.0 mL of water at 95.00 ∘C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
Answer:
[tex]T_F=47.3\°C[/tex]
Explanation:
Hello!
In this case, since we have hot and cold water, we infer that as hot water cools down, cool water heats up based on the first law of thermodynamics; thus, we can write:
[tex]Q_{hot}+Q_{cold}=0[/tex]
In such a way, we can write the expression in terms of mass, specific heat and temperature change:
[tex]m_{hot}C_{hot}(T_F-T_{hot})+m_{cold}C_{cold}(T_F-T_{cold})=0[/tex]
However, since they both have the same specific heat and the same mL are in g due to the 1.00-g/mL density, we obtain:
[tex]m_{hot}(T_F-T_{hot})+m_{cold}(T_F-T_{cold})=0\\\\T_F=\frac{m_{hot}T_{hot}+m_{cold}T_{cold}}{m_{hot}+m_{cold}}[/tex]
Now, we plug in to obtain:
[tex]T_F=\frac{140.0g*95.00\°C+300g*25.00\°C}{140.0g+300g}\\\\T_F=47.3\°C[/tex]
Best regards!
A car is traveling 100 miles per hour. How many feet does this car travel in 5 seconds?
Answer:
5280 feet per mile. 5280 feet divided 60 minutes then divide by 60 gives you the feet per second. multiply by 5.... 7 and 1/3 feet in 5 seconds.
How many grams of CO are needed to react with an excess of Fe2O3 to produce 209.7 g Fe? Equation Fe2O2(g) + 3CO(g) -> 3CO2(g) + 2Fe(g)
Answer: 157.3 g CO
Explanation:
Fe2O3 + 3CO —> 3CO2 + 2Fe [1 mol + 3 mol —> 3 mol + 2 mol]
3 mol CO —> 2 mol Fe
3*28g —> 2*56g
amt CO 3*28*209.7/(2*56) = 157.3g
Determine the chemical equation for the reaction between Fe3+ and Cu2+ with NH3
Answer:
Cu2 + 4 NH3 = Cu (NH3) 42+
so - - >
[Cu (NH3) 6] ^ 2+
Explanation:
pls help me i really need help
Answer:
13. t = 1183 min and 0.50 M.
14. [tex]t_{1/2}=2.67x10^{-8}hr[/tex]
Explanation:
Hello!
13. In this case, according to the units, we infer this is a second-order reaction which has the following integrated rate law:
[tex]\frac{1}{[A]} =\frac{1}{[A]_0} +kt[/tex]
Which can be solved for the time as shown below:
[tex]t=\frac{ \frac{1}{[A]}-\frac{1}{[A]_0}}{k}[/tex]
Thus, we plug in the given concentrations and rate constant to obtain:
[tex]t=\frac{ \frac{1}{0.250M}-\frac{1}{0.850M}}{0.002387M^{-1}min^{-1}}\\\\t= 1183min[/tex]
For the second part, we proceed by using the same rate constant and the new initial concentration as follows:
[tex]\frac{1}{[A]} =\frac{1}{[A]_0} +kt\\\\\frac{1}{[A]} =\frac{1}{0.750M} +0.680M^{-1}min^{-1}*0.996min\\\\\frac{1}{[A]} =1.99,M[/tex]
[tex][A]=0.50M[/tex]
14. In this case, according to the units of the rate constant, we infer this is a zeroth-order reaction, therefore we compute the half-life has shown below:
[tex]t_{1/2}=\frac{[A]_0}{2k}[/tex]
Thus, we plug in to obtain:
[tex]t_{1/2}=\frac{2.696x10^{-6}M}{2*50.5M*hr^{-1}}[/tex]
[tex]t_{1/2}=2.67x10^{-8}hr[/tex]
Best regards!
One mole of a metallic oxide reacts with one mole of hydrogen to produce two moles of the pure metal
and one mole of water. 5.00 g of the metallic oxide produces 2.32 g of the metal. What is the metallic
oxide? (Use molar masses)
Answer:
Lithium oxide, Li₂O.
Explanation:
Hello!
In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:
[tex]M_2O+H_2\rightarrow 2M+H_2O[/tex]
Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:
[tex]5.00gM_2O*\frac{1molM_2O}{(2*X+16)gM_2O}*\frac{2molM}{1molM_2O}*\frac{XgM}{1molM}=2.32gM[/tex]
Thus, we perform the operations in order to obtain:
[tex]\frac{10X}{(2X+16)}=2.32[/tex]
So we solve for x as shown below:
[tex]10X=2.32(2X+16)\\\\10X=4.64X+37.12\\\\X=\frac{37.12}{10-4.64}\\\\X= 6.93g/mol[/tex]
Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.
Best regards!