Answer:
c) 387g
Explanation:
Water;
Mass = 250g
Specific heat = 4.184
Initial Temp, T1 = 25 + 273 = 298K
Final Temp, T2 = 35 + 273 = 308K
Heat = ?
H = mc(T2 - T1)
H = 250 * 4.184 (308 - 298)
H = 10460 J
Iron;
Initial Temp, T2 = 95 + 273 = 368K (Upon converting to kelvin temperature)
Mass = ?
Final Temp, T1 = 35 + 273 = 308
Heat = 10460 (Heat lost by iron is qual to heat gained by water)
Specific heat = 0.45
H = mc(T2-T1)
M = 10460 / [0.45 (308 - 368)]
M = 10460 / 27
M = 387g
The mass of the iron has been calculated as 387.40 grams.
Specific heat can be defined as the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree celsius.
Since in the reaction there has been no heat loss, the heat released by iron has been equivalent to heat absorbed by the water in the calorimeter.
The heat absorbed by calorimeter:Heat = mass × specific heat of water × change in temperature
Heat absorbed = 250 grams × 4.184 J/g[tex]\rm ^\circ C[/tex] × (308 K - 298 K)
Heat absorbed = 10460 J
The heat released by Iron can be given by:
Heat released = mass × specific heat of water × change in temperature
Heat released = mass × 0.45 J/g.K × (308 K - 368 K)
Heat released = mass × 27
Heat released = Heat absorbed
Mass of Iron × 27 = 10460 J
Mass of iron = 387.40 grams.
The mass of the iron has been calculated as 387.40 grams.
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I (1) Did your upper lip area feel warmer or cooler? _____________________
(2) Was the stretching process endothermic or exothermic for the rubber band? ________________
(3) Explain your reasoning.
II
(4) Amount of NaHCO3 used/measured out _______________________ teaspoons
(4a) Observations on Sodium Bicarbonate
(4b) Is sodium bicarbonate water soluble? ______________
(5) Observations on Acetic Acid (vinegar) solution
(6) Observations after the addition of the first tablespoon of vinegar to the sodium bicarbonate
(7) Total amount of HC2H3O2 solution used for the reaction to go to completion _______ tbs
(8a) Overall observations on the reaction. [How was the CO2 gas production observed?]
(8b) How did you determine when the reaction was complete?
(Give at least 2 indications/observations).
(9a). Amount of NaC2H3O2 solid produced _____________________________
(9b) Observations on Sodium Acetate:
(10) Complete the balanced equations for this reaction:
(a) HC2H3O2(aq) + NaHCO3(s)
(b) H2O(ℓ) + NaC2H3O2(aq) heat
(11) Is reaction 10a above a reaction? ___________ How do you know?
If yes, what type/classification? _____________________________
(12) Is reaction 10b above a reaction? ___________ How do you know?
If yes, what type/classification? _____________________________
III (13) Yes or no (before potato)? ____________
(14) Yes or no (after potato)? ___________________
(15) Observations (signs of a reaction occurring):
(16) Potato is ________________________________
(17) Write the reaction here
(18) Type (classification) of reaction ______________________________________
IV (19) Observations on metal (after reaction)
(20) Write the reaction here
(21) Type (classification) of reaction ______________________________________
\
Answer:
no evidence of how to do the anwsers sorrry.
Explanation:
how many grams of water are needed to form 21.8 grams of oxygen gas?
Answer:
24.5g
Explanation:
Given parameters:
Mass of oxygen gas = 21.8g
Unknown:
Mass of water = ?
Solution:
This problem deals with the decomposition of water;
Reaction equation;
2H₂O → 2H₂ + O₂
2 mole of water will produce 1 mole of oxygen gas
First find the number of mole of the oxygen gas given;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
molar mass of O₂ = 2(16) = 32g/mol
Number of moles of O₂ = [tex]\frac{21.8}{32}[/tex] = 0.68moles
1 mole of oxygen gas will be produced from 2 mole of water
0.68moles of oxygen gas will be produce from 0.68 x 2 moles of water; = 1.36moles of water
Mass of water = number of moles x molar mass
Molar mass of water = 2(1) + 16 = 18g/mol
Mass of water = 1.36 x 18 = 24.5g
A 25.00 mL sample of 0.320 M KOH is titrated with 0.750 M HBr at 25 °C.
Required:
a. Calculate the initial pH before any titrant is added.
b. What is the initial pH before any titrant was added?
c. What is the pH of the solution after 5.00mL of the titrant was added?
Given that :
Reaction equation ; [tex]HB_{r} + KOH ---> KBr + H_{2}O[/tex]
A) and B) Determine the Initial pH before addition of titrant
First step : compute the value of pOH
pOH = - log ( [OH⁻])
= -log ( 0.320 ) = 0.50
∴ Initial pH before the titrant is added = 14 - pOH
= 14 - 0.5 = 13.5
C ) Determine the pH of solution after 5 mL titrant is added
First step : determine the reacting moles of each substance
n kOH = 0.025 mL * 0.320 mol/L = 0.00800 mol
n HBr = 0.005 * 0.750 mol/L = 0.00375 mol
next step : compute the value of the concentration of OH⁻ in final solution
n kOH ( remaining ) = 0.00800 - 0.00375 = 0.00425 mol
final solution = 25.00 mL + 5.00 mL = 30.00 mL
∴ The value of the concentration of [ OH⁻] in 30.00 mL
= [ OH⁻] = ( 0.0042 mol / 0.0300 mL )
= 0.142 M
hence pOH = - log (0.142) = 0.849
Final step; The pH of the solution after 5 mL of titrant is added
= 14 - pOH
= 14 - 0.849 = 13.15
Hence we can conclude that the initial pH before titrant was added is 13.50 and the pH after is as listed above.
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Which TWO statements describe the ocean floor giving brainliest
Answer:
A & B
Explanation:
Done the Quiz
calculate the pOH of 0.0001 NaOH in water
Answer:
pOH = 4
Explanation:
NaOH is a strong base which means that it dissociates completely in water. It will break apart into Na⁺ and OH⁻ ions.
NaOH ⇒ Na⁺ + OH⁻
Because NaOH dissociates completely into its respective ions in water, the moles of NaOH is equal to the moles of hydroxide ions. So, [OH⁻] = 0.0001 M.
Now to find the pOH, use the formula pOH = -log[OH⁻].
pOH = -log[OH⁻]
= -log(0.0001)
= 4
The pOH of the solution is 4.
Hope that helps.
Density differences in different materials are able to change the of a wave. A)Amplitude B)Crest C)Speed D)Trough
Answer:
C. Speed
Explanation:
Density differences in different materials are able to change the speed of a wave.
Wave speed is dependent on the frequency and wavelength of a wave. As a wave travels from one medium to another, the speed of the wave changes. Speed of a wave is medium dependent. The denser a medium, the slower the speed of waves will be be. A less dense medium will have waves traveling through faster.Answer:
Speed
Explanation:
The speed or mass of something can totally change the direction of the wave
Which phrase best describes soil?
Answer:
unconsolidated material that contains nutrient matter and weathered rock
Explanation:
Earth's crust is made up of many layers. The top is soil, which provides the most nutrients for plants, like hummus( The organic nutrient for soil, form from the decaying of plants and animals)
The soil gets its texture from the bedrock, the bottom layer, which weathers, and goes into the soil.
-kiniwih426
What is the correct equation for the solubility product when calcium phosphate is dissolved in water
Answer:
The solubility of calcium phosphate is
2.21x10−4g/L.
Explanation:
1.8 g of ethane gas is used to
boil 200 cm' of water. What
is the number of molecules
of the ethane gas?
[Relative atomic mass of
C = 12 and H = 1, Avogadro
constant = 6.02 x 10^23 mol ]
Answer:
3.6 x 10²²molecules
Explanation:
Given parameters:
Mass of ethane gas = 1.8g
Unknown:
number of molecules of ethane gas = ?
Solution:
To solve this problem, we first find the number of moles of ethane gas.
Molar mass of ethane, C₂H₆ = 2(12) + 6(1) = 30g/mol
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Insert the parameters and solve;
Number of moles = [tex]\frac{1.8}{30}[/tex] = 0.06mole
1 mole of a substance contains 6.02 x 10²³ molecules
0.06mole of ethane will contain 0.06 x 6.02 x 10²³ = 3.6 x 10²²molecules
All bacteria contain chromosomes
True
False
Answer:
True,
Explanation:
doesn't have ends like chromosomes of eukaryotic organisms
so all bacteria contains chromosomes yes, 100%
can i have brainliest i need 2 more to get a new rank tysm
The map below shows the range of three types of grasslands in the United
States. What do tallgrass prairies have that shortgrass prairies lack?
23
Blue: Shortgrass prairie
Purple: Mixed grass prairie
Green: Tallgrass prairie
A. Infertile soil
B. Cedar breaks
C. More rainfall
D. Rain shadows
Answer:
More rainfall is the correct answer.
Explanation:
a-pe/x
For the reaction between ammonium phosphate and lead (IV) nitrate, producing ammonium nitrate and lead (IV) phosphate, how many moles of lead (IV) nitrate would be needed to produce 11.75 moles of ammonium nitrate
Answer:
2.938 mol Pb(NO₃)₄
Explanation:
Step 1: Given data
Moles of NH₄NO₃ to be produced: 11.75 molMoles of Pb(NO₃)₄: ?Step 2: Write the balanced equation
4 (NH₄)₃PO₄ + 3 Pb(NO₃)₄ = Pb₃(PO₄)₄ + 12 NH₄NO₃
Step 3: Calculate the number of moles of Pb(NO₃)₄required to produce 11.75 moles of NH₄NO₃
The molar ratio of Pb(NO₃)₄ to NH₄NO₃ is 3:12.
11.75 mol NH₄NO₃ × (3 mol Pb(NO₃)₄/12 mol NH₄NO₃) = 2.938 mol Pb(NO₃)₄
Calculate the concentrations of H3O(+) and SO4(2-) in a solution prepared by mixing equal volumes of 0.2M HCl and 0.6M H2SO4.
Answer:
[H₃O⁺] = 0.7M
[SO₄²⁻] = 0.3M
Explanation:
The HCl in solution produce 1mole of H₃O⁺ and H₂SO₄ produce 2 moles of H₃O⁺.
When two solutions are mixing in equal volumes, the concentrations of both reactants is halved regard to their initial concentrations. That is:
HCl = 0.1M
H₂SO₄ = 0.3M
And H₃O⁺ will be:
0.1M + 2*0.3M = 0.7M
And SO₄²⁻ comes just from H₂SO₄, that means:
[H₂SO₄] = [SO₄²⁻] = 0.3M
The mass number of a nucleus is the number of: protons nucleons electrons neutrons
protons
there aint rlly an explanation tbh
Answer:
Nucleons
The mass number of a nucleus is the number of protons and neutrons called the nucleons! Nucleons are the sum of protons and neutrons present in the nucleus of an atom.
What is the empirical formula for a compound which contains 80.2% zinc and the rest is oxygen
The empirical formula for a compound : ZnO
Further explanationThe empirical formula is the smallest comparison of atoms of compound =mole ratio of the components
The principle of determining empirical formula
Determine the mass ratio of the constituent elements of the compound.
Determine the mole ratio by by dividing the percentage by the atomic mass
Percentage Oxygen :
100\%-80.2%=19.8\%
mol ratio for Zn : O =
[tex]\tt \dfrac{80.2}{65.38}\div \dfrac{19.8}{16}\\\\1.227\div 1.238\rightarrow divide~by~smallest(1.227)\\\\1\div 1[/tex]
ana walked though this part of the forest when she passed under some low branches water drops fell on her head what most likely caused the water drops to form
Answer:
well gravity
Explanation:
gravity pull everything to earth
How do u draw an electron dot diagram of an aluminum atom
Answer:
you tell me
Explanation:
Identify ammonia. a. strong electrolyte, strong base b. weak electrolyte, strong base c. strong electrolyte, weak base d. nonelectrolyte e. weak electrolyte, weak base
Answer:
Ammonia is a weak electrolyte, weak base.
Option e.
Explanation:
Ammonia can take a proton from water to make ammonium.
It is a base, because it takes proton.
When a compound can take protons, we know that is base, according to Bronsted Lowry theory.
We can't describe ammonia as a base, according to Arrhenius, but we know it is base according to Lewis, because the N from the ammonia can be a donor of its electron pair.
It is weak because an small amount of ammonia, can react to produce ammonium, between the protons of water. This is the equilibrium, where the ammonia is considered as the conjugate strong acid of ammonia.
NH₃ + H₂O ⇄ NH₄⁺ + OH⁻ Kb
All the amines are considered as weak bases, because they look like ammonia, where the H of NH₃ are replaced by others chains.
------NH₂
-----NH-----
Alpha decay please help (nuclear chemisty)
Explanation:
Given reaction:
¹⁰⁸₅₃I → ⁴₂He + ?
An alpha particle decay requires that the mass number decreases by 4 and atomic number decreases by 2.
This reaction is called nuclear fission;
The unknown compound, say Y, will have mass number and atomic number shown below;
¹⁰⁸₅₃I → ⁴₂He + ᵃₙY
Mass number; 108 = 4 + a
a = 104
Atomic number ;
53 = 2 + n
n = 51
Y will be ¹⁰⁴₅₁Y
The atomic number of the new element is 51; so, it is antimony.
¹⁰⁴₅₁Sb
__________ is required to make a wave.
Answer:
The moon is required to make a wave.
Imma give 35 points cus I really need it today please.
Answer:
yes the picture is not clear
In which breaker of water will sugar dissolve fastest?
Answer: 90
Explanation: Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster.
Answer:
90 c
Explanation:
The sugar dissolve in the hottest bc of the heat it will melt in with the water i an pretty sure
A sample of krypton gas collected at a pressure of 1.31 atm and a temperature of 26.0°C is found to occupy a volume of 23.3 liters
Mol of Kr gas = 1.244
Further explanationIn general, the gas equation can be written
PV=nRTwhere
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08205 L.atm / mol K
T = temperature, Kelvin
P=1.31 atm
V=23.3 L
T=26+273=299 K
mol of sample :
[tex]\tt n=\dfrac{PV}{RT}=\dfrac{1.31\times 23.3}{0.08205\times 299}=1.244[/tex]
Methanol is an alcohol common to alcoholic beverages but toxic if it contains more than 0.4% how much methanol is present in a 750mL solution?
Answer:
Volume of methanol present in solution = less than 3 ml
Explanation:
Given:
Volume of solution = 750 ml
Find:
Volume of methanol present in solution
Computation:
Volume of methanol present in solution = Volume of solution x 0.4%
Volume of methanol present in solution = 750 ml x 0.4%
Volume of methanol present in solution = 3 ml
Volume of methanol present in solution = less than 3 ml
The amount of methanol present in the 750 mL solution is 3 mL
From the question given above, the following data were obtained:
Percentage of methanol = 0.4%
Volume of solution = 750 mL
Volume of methanol =.?The volume of methanol present in the 750 mL of solution can be obtained as follow:
Volume = Percent × Volume of solution
Volume of methanol = 0.4% × 750
Volume of methanol = 0.004 × 750
Volume of methanol = 3 mLThus, the amount of methanol present in the 750 mL solution is 3 mL
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an atom has a mass number of 41 and contains 21 neutrons. which element is it?
The element you are looking for is Scandium, the 4th element in the third group.
A typical triple bond ________. Group of answer choices consists of six shared electron pairs consists of two σ bonds and one π bond consists of one σ bond and two π bonds consists of three shared electrons is longer than a single bond
Answer:
One sigma bond and two pi bonds.
Explanation:
Triple covalent bonds between two atoms are created when they share three electron pairs. Three dashes connecting the atoms signify a triple bond. Pnictogen or the nitrogen family of atoms are those having triple valency. The correct option is C.
Two pi bonds and one sigma bond make up a triple bond. One sigma bond and one pi bond make up a double bond. Sigma bonds are usually made up of one atom. A single bond is described as a two-valence electron chemical bond between two atoms.
Covalent bonds with overlapping atomic orbitals fall under the categories of sigma and pi bonds. While pi bonds are created by the lateral overlapping of two atomic orbitals, sigma bonds are created by the head-to-head overlapping of atomic orbitals.
Thus the correct option is C.
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Maalox and Mylanta are both antacids that contain aluminum hydroxide as their active ingredient. Write the balanced equation for the neutralization of hydrochloric acid with aluminum hydroxide, Al(OH)3. Include physical states.
Answer:
3HCl(aq)+Al(OH)3(s)=AlCl3(aq)+3H2O(l)
Explanation:
This is a double replacement reaction.
Step One: Write down the compound from the name.
Aluminum Hydroxide Al(OH)3
Hydrochloric Acid HCL
Step Two: Perform the double replacement reaction.
AB+CD=AD+CB
Step Three: Balance the equation
Final step: Write in physical states.
The physical state will either be (aq), (s), (l) or (g).
What kind of change forms a new substance?
A physical change
Answer:
Chemical change
Explanation: Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.
protons
neutrons
atomic symbol
atomic number
chemical element
Atoms are tiny pieces of matter that make up all the substances around you. All atoms
contain one or more positively charged particles called
, which are
found in an atom's nucleus. In many atoms, the nucleus also contains
which have no electrical charge. There are also small, negatively
charged particles called electrons found outside the nucleus. Together, these three types
of particles make up the structure of atoms.
The number of protons in an atom is the atom's
When two atoms
have the same atomic number, they are are classified as the same
All known chemical elements are listed in the periodic table, where they are arranged by
atomic number. The periodic table contains information about each element, often
including a short version of the element's full name called its
How do I find the number of moles and molar mass of Gas A and Gas B with the information provided?
Answer:
A.
Explanation:
hope this helped sorry if its wrong!