The amount of heat (in J) required for the temperature change is 26752 J.
What is the amount of heat required to raise the temperature of water from 25°C to 89°C?The amount of heat required to raise the temperature of water from 25°C to 89°C is calculated as follows:
Heat required = mass * specific heat capacity * temperature changeMass of water = volume * density
density of water = 1 g/mL
volume of water = 100 mL
mass of water = 100 mL * 1 g/mL
mass of water = 100 g
heat capacity of water = 4.18 J/g°C
Temperature change = 89 - 25 = 64 °C
Heat required = 100 * 4.18 * 64
Heat required = 26752 J
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HELP ME PLEASEEE WITH CHEMISTRY HOMEWORK
Answer:
Explanation:
11- d
12- dont know
13- c
14- d = 30
15- b =64
16- c = 34
17- positive= 19 protons , negative= 19electrons , neutral = 39 - 19 = 20 notrons
18- chlorine-35
because atomic mass (35.453) is close to (35)
Graphite is a solid form of carbon that is commonly used in pencils. graphite breaks easily. What property of graphite makes it break easily.
The graphite is brittle in nature and this property makes the graphite to be break very easily or to make the graphite weak.
Graphite is a solid form of carbon that is commonly used in pencils. graphite breaks easily. What property of graphite makes it break easily?
Actually the graphite is naturally very brittle compound and the graphite can not be used as a material structure on its own due to its sheer planes.
The fact that why graphite is brittle is that the carbon atoms in the graphite are only bounded by the three strong covalent bonds in a two-dimensional 'layer lattice'.
The bonds inside the atoms of the carbon which is present in the layers of the graphite maybe strong but but the bonds that are formed by carbon atoms between layers are very weak, so that's why the graphite can be broken easily.
So we can conclude that the graphite is brittle in nature and this property makes the graphite to be break very easily or to make the graphite weak.
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How to balance NH3+NO=N2+H2O
Explanation:
NH₃+NO=N₂+H₂O;
NH₃+NO=N₂+6H₂O;
NH₃+6NO=N₂+6H₂O;
4NH₃+6NO=N₂+6H₂O;
4NH₃+6NO=5N₂+6H₂O.
How many kilograms of HNO3 are consumed to produce 112kg Ca(H2PO4)2 in this reaction?
Ca3(PO4)2 + 4HNO3 → Ca(H2PO4)2 + 2Ca(NO3)2 (Balanced equation)
Taking into account the reaction stoichiometry, 120.615 kg of HNO₃ are consumed to produce 112 kg Ca(H₂PO₄)₂.
Reaction stoichiometryIn first place, the balanced reaction is:
Ca₃(H₂PO₄)₂ + 4 HNO₃ → Ca(H₂PO₄)₂ + 2 Ca(NO₃)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Ca₃(H₂PO₄)₂: 1 moleHNO₃: 4 molesCa(H₂PO₄)₂: 1 moleCa(NO₃)₂: 2 molesThe molar mass of the compounds is:
Ca₃(H₂PO₄)₂: 314 g/moleHNO₃: 63 g/moleCa(H₂PO₄)₂: 234 g/moleCa(NO₃)₂: 164 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction (being 1000 g= 1 kg):
Ca₃(H₂PO₄)₂: 1 mole ×314 g/mole= 314 grams= 0.314 kgHNO₃: 4 moles ×63 g/mole= 252 grams= 0.252 kgCa(H₂PO₄)₂: 1 mole ×234 g/mole= 234 grams= 0.234 kgCa(NO₃)₂: 2 moles ×164 g/mole= 328 grams= 0.328 kgMass of HNO₃ requiredThe following rule of three can be applied: If by reaction stoichiometry 0.234 kg of Ca(H₂PO₄)₂ is produced from 0.252 kg of HNO₃, 112 kg of Ca(H₂PO₄)₂ is produced from how much mass of HNO₃?
mass of HNO₃= (112 kg of Ca(H₂PO₄)₂× 0.252 kg of HNO₃)÷ 0.234 kg of Ca(H₂PO₄)₂
mass of HNO₃= 120.615 kg
Finally, 120.615 kg of HNO₃ are consumed to produce 112 kg Ca(H₂PO₄)₂.
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How many grams of gold will fill up 5.00 cm3 of space if the density of gold is 19.3 g/cm3?
Round to the correct number of significant figures. Do not include the unit in the answer.
The gold will fill up 5.00 cm³of space if the density of gold is 19.3 g/cm³. Then the amount of gold filled in 5.00 cm³ of space is 96.5g.
What is density?Density is defined as the measurement of how tightly the material is packed together.
Density is defined as mass/volume.
The SI unit of density is gram/cubic centimeter.
Density can be expressed as
Density = mass/volume
As density is given as 19.3 gm/cm³ and volume is 5.00 cm³, then the mass can be calculated as
Mass = density x volume
= 19.3 x 5.00 = 96.5g
Thus, the amount of gold filled in 5.00 cm³ of space is 96.5g.
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Which of the following are physical changes?
Making a shirt from cloth (physical)
ice melting (physical)
baking a cake (chemical)
burning wood (chemical)
theres two physical ones but i can only pick one answer
Answer: I believe its ice melting
Explanation: it would be ice melting because it can turn back into ice by itself with out any human doing anything to it.
Calculate the molarity of 143 grams of sucrose, C12H22O11, in 4.20 liters of solution.
Answer:
0.0996 M (3 s.f.)
Explanation:
Molarity is the number of moles per litre.
Let's find the number of moles of sucrose.
[tex]\boxed{\text{Moles= Mass}\div\text{Mr}}[/tex] , where Mr is the molecular weight of the compound.
[tex]\text{Mr of C}_{12}\text{H}_{22}\text{O}_{11}[/tex]
= 12(12)+22(1)+11(16)
= 342
Moles of sucrose
= 143 ÷342
= 0.41813 mol (3 s.f.)
This means that in 4.20L of solution, we have approximately 0.41813 moles of sucrose. We can now calculate the amount of sucrose in 1L of solution.
Molarity
= 0.41813 ÷4.2
= 0.099555 mol/L (5 s.f.)
= 0.0996 M (3 s.f.)
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How many atoms are in 5.00 moles of Mn?
Answer:
3.01 x 10²⁴ atoms Mn
Explanation:
To find the number of manganese (Mn) atoms, you need multiply the given mole value by Avogadro's Number. Avogadro's number is a ratio which represents the number of atoms per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the denominator to cancel the units of the given value). The final answer should have 3 sig figs like the given value (5.00 = 3 sig figs).
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
5.00 moles Mn 6.022 x 10²³ atoms
------------------------- x -------------------------------- = 3.01 x 10²⁴ atoms Mn
1 mole
How many hydrogen atoms are present in this molecule?
A: 6
B: 8
C: 9
D: 10
E: 13
what is the final temperature of an 18.0 g aluminum sample if it is initially at 22.0 C and it absorbs 48.0 calories of heat energy? Note: The specific heat value for aluminum is 0.210 cal/g C.
The final temperature of an 18.0 g aluminum sample if it is initially at 22.0 C and it absorbs 48.0 calories of heat energy is 34.7°C.
How to calculate final temperature?The temperature of a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of the substancec = specific heat capacity∆T = change in temperatureAccording to this question, an 18.0 g aluminum sample is initially at 22.0 C and it absorbs 48.0 calories of heat energy. The final temperature can be calculated as follows:
48 = 18 × 0.210 × {X - 22}
48 = 3.78x - 83.16
3.78x = 131.16
X = 34.7°C
Therefore, the final temperature of an 18.0 g aluminum sample if it is initially at 22.0 C and it absorbs 48.0 calories of heat energy is 34.7°C.
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Hello- is anyone available to help me?
If the concentration inside the cell is 5% and the concentration outside the cell is 6%, this solution will be hypertonic.
If the concentration inside the cell is 3% and the concentration outside the cell is 1%, this solution will be hypotonic.
What is hypertonic solution?Hypertonic solution is a solution that contains more dissolved particles (such as salt and other electrolytes) than is found in normal cells and blood.
A solution will be hypertonic to a cell if the outside concentration is higher than that inside the cell, and the solutes cannot cross the membrane.
What is hypotonic solution?Hypotonic solution is a solution that contains fewer dissolved particles (such as salt and other electrolytes) than is found in normal cells and blood.
A solution will be hypotonic to a cell if the outside concentration is lower than that inside the cell, and the solutes can cross the membrane.
Thus, if the concentration inside the cell is 5% and the concentration outside the cell is 6%, this solution will be hypertonic.
if the concentration inside the cell is 3% and the concentration outside the cell is 1%, this solution will be hypotonic.
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Which atoms in the table are the same element and with what reasoning?
Atoms 2 and 3, because they have the same number of electrons.
All atoms are the same because they have the same number of neutrons.
Atoms 1 and 3, because the sum of all subatomic particles are equal.
Atoms 1 and 2, because they have the same number of protons.
The atoms that are the same element are atoms 1 and 2, because they have the same number of protons (option D).
What is an element?Element is one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
The atoms of an element have the same number of protons, which is the atomic number.
According to the table given above, three atoms and their respective proton, electron and neutron number are given.
It can be said that atoms 1 and 2 are of the same element, because they have the same number of protons.
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Ayo who can answer this with one hundred ayo's you a real one if you can cuh
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Find the value of x and y
Which option best describes the outer shell of the atoms in
Group 17 on this illustration of the Periodic Table?
O They have 7 protons.
OThey have 17 protons.
OThey have 7 electrons.
OThey have 17 electrons.
The option that best describes the outer shell of the atoms in Group 17 is they have 7 electrons.
What are the basic characteristics of group 17 elements?Group 17 elements such as chlorine, fluorine, etc have low bond dissociation energy due to their small atomic radius.
Basic characteristics include:
All the elements of group 17 have 7 electrons in its valence shell. These elements require one electron to finish their octet. They can complete their octet either by picking up an electron or sharing an electron.Thus, the option that best describes the outer shell of the atoms in Group 17 is they have 7 electrons.
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The old, depressed house moaned as the wind blew.
Alliteration
Allusion
Assonance
Hyperbole
Metaphor
Onomatopoeia
Oxymoron
Personification
Simile
How much water is in this cylinder?
Answer:
It's about 13 mL, read it where the lowest point is,
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day :)
Answer:
About 12.7mL
Explanation:
You always have to count the dip portion of the liquid. It's okay if the number is an estimate. There won't be an exact answer. My chemistry teacher says to not round the answer. Hope this helps!
Using the data in the table, determine the rate constant of the reaction and select the appropriate units.
A+2B⟶C+D
TRIAL---[A] (M)--- [B] (M)---RATE (M/s)
1 ---------0.360 ---0.360----0.0224
2 --------0.360----0.720----0.0224
3 --------0.720 ----0.360----0.0896
Order:
k=
Observation:
The rate is unaffected with respect to the concentration of B.
Answer:
k=0.0224 M/s
Explanation:
Give me Brainliest if that helped! :)
The rate constant of the reaction is 0.0224 m/s. the rate constant is denoted by symbol k. The velocity and direction of a chemical reaction are quantified in chemical kinetics by the reaction rate constant, or reaction rate coefficient, k.
What is rate constant ?The proportionality constant in the equation that defines the link between the rate of a chemical reaction and the concentrations of the reacting chemicals is known as the rate constant, also known as the specific rate constant.
The rate constant provides insight into the variables that affect a reaction's rate. The dependence of the molar concentration of the reactants on the rate of reaction may be determined by knowing the rate constant.
The rate constant provides insight into the variables that affect a reaction's rate. The dependence of the molar concentration of the reactants on the rate of reaction may be determined by knowing the rate constant.
Thus, option 2 is correct.
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The pressure exerted by 0.25mol of carbon monoxide in 10dm3 flask is 120kPa. Calculate the temperature in the flask in kelvin.
The temperature in the flask in kelvin is 577.3 K.
What is the relationship between volume, temperature, moles and pressure of a gas?The relationship between volume, temperature, moles and pressure of a gas is given by the ideal gas equation written below:
PV = nRTwhere;
P is pressureV is volumen is number of moles of the gasR is molar gas constantT is temperatureFor the gas:
P = 120 kPa
n = 0.25 moles
V = 10 dm³
R = R = 8.314 dm³.kPa/mol.K
T = ?
T = PV/nR
T = 120 * 10/8.314 * 0.25
T = 577.3 K
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naturally occuring strontium consists of four isotopes, Sr-84, Sr-86,Sr-87 and ser-88 what is the average atomic mass of stronium
The average atomic mass of naturally occurring strontium which consists of four isotopes, Sr-84, Sr-86, Sr-87, and Sr-88 is 87.1 amu.
To determine average atomic mass,
we take average of weight of all of the isotopes of that element.
Molecular weight of -
Sr-84 = 83.9 amu
Sr-86 = 85.9 amu
Sr-87 = 86.9 amu
Sr-88 = 87.9 amu
Average = 83.9 + 85.9 + 86.9 + 87.9 = 86.15
4
We'll see the abundance of each isotope of strontium. Since the most abundant isotope of strontium is Sr-88 with 82.6% abundance. Therefore, the average atomic mass of strontium is closest to the mass of Sr-88, and the other isotopes are less than this mass.
Hence, the atomic mass of strontium is, 87.1 amu.
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An analytical chemist measures the amount of Elements and in four samples of an unknown Substance :
An analytical chemist measures the amount of Elements and in four samples of an unknown Substance ;
as per the samples :
we have mass % of
[tex]E_1[/tex] in Sample 1 = 8.2g x 100/ 8.29 +18.99
= 30%
mass % [tex]E_1[/tex] in sample2 = 6.19 x 100/ 6.1 g +13.9 g
=30%
Similasly mass % of [tex]E_1[/tex]in sample 3 and sample are also 30%
Hence mass % [tex]E_2[/tex] in all samples are 70%
:. X is a pure substance
mass of sample x = 10.0g
mass of Element El = 30% of x
= 30 x 100g/ 100
= 3.og
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Why is it difficult to precisely date samples from after the 1940's?
A. It is too close to the present to get an accurate reading from a half-life.
B. There aren't any radioactive isotopes that have a half-life short enough to date something that recent.
C. A major solar flare in the 1940's contaminated everything on the surface at that time with extra radioactivity.
D. Nuclear bombs contaminated the samples with more radioactivity.
It is difficult tp precisely date samples from after the 1940's is Nuclear bombs contaminated the samples with more radioactivity.
We use radioactive method to date the samples by using various radioisotopes and it gives a high degree of accuracy but this radioactive method may not work in future because of Nuclear bombs , nuclear reactors test started changing environment and this will lead to the difficulties in dating sample precisely.
Radiocarbon dating or carbon - 14 dating uses natural occurring radioisotope carbon - 14,It is used to determine the age of object from bones to plant fibers and wood, by the radiocarbon properties.
Thus , It is difficult tp precisely date samples from after the 1940's is Nuclear bombs contaminated the samples with more radioactivity.
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Why does copper have a high thermal and electrical conductivity
Answer:
because it is good conductor of electricity
In the following Isotope Table, how would one find the letter J?
Add 40 and 44
Subtract 40 from 44
Multiply 40 by 44
Add 40 to the isotope's atomic numer
Answer:
A. Add 40 and 44
Explanation:
mass number = protons + neutrons
protons = electrons
so mass number = 40 + 44
Which statement describes a step in the formation of an ionic bond?
Answer:
Which statement describes a step in the formation of an ionic bond? An attraction occurs between two ions that have the same charge.
Explanation:
what is equivalent to 2ATM
Complete the balanced dissociation equation for the compound below in aqueous solution. If the compound does not dissociate, write NR after the reaction arrow. Be sure to include the proper phases for all species within the reaction.
ZnCl2-
The balanced dissociation equation of the ionic compound ZnCl₂ is given below:
ZnCl₂ (aq)→ Zn²⁺ (aq) + 2 Cl⁻ (aq) What is a dissociation equation of a chemical reaction?A dissociation equation of a chemical reaction is a n equation which shows the products formed when an ionic substance is dissolved in an aqueous solution to produce ions.
A dissociation reaction results in the formation of ions and occurs only in ionic compounds
The dissociation of the ionic compound ZnCl₂ is shown below:
ZnCl₂ (aq)→ Zn²⁺ (aq) + 2 Cl⁻ (aq)From the equation above, the ionic compound zinc chloride is dissolved in water. The dissolution of the compound inn water results in the free dissociation or separation of the ions present in the crystal structure of the compound.
The compound dissociates to produce two moles of chloride ions and one mole of zinc (ii) ions. This is because the charge on the zinc ion is +2 while that on the chloride ion is -1.
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Write the balanced NET ionic equation for the reaction when AICI3 and Na₂S are mixed in aqueous solution. If no reaction occurs, simply write only NR. Be sure to include the proper phases for all species within the reaction.
Answer:
2AlCl3(aq) + 3Na2S(aq) = Al2S3(aq) + 6NaCl(aq)
Explanation:
First, you have to write down a complete equation as shown below:
AlCl3 + Na2S → Al2S3 + NaCl.
When you at the above equation is not balanced.
To balance the equation, we have to identify the number of products and reactants.
Al: 1a + 0b = 2c + 0d, we have 2 Al
Cl: 3a + 0b = 0c + 1d, we have 3Cl
Na: 0a + 2b = 0c + 1d, we have 2Na
S: 0a + 1b = 3c + 0d, we have 3S
Then we simplify to obtain the lowest whole integer value:
a = 2 (AlCl3)
b = 3 (Na2S)
c = 1 (Al2S3)
d = 6 (NaCl)
Substitute the values to our first equation giving us,
2AlCl3 + 3Na2S = Al2S3 + 6NaCl,
We then include the states. Since the reaction is in aqueous solution, we insert (aq)
2AlCl3(aq) + 3Na2S(aq) = Al2S3(aq) + 6NaCl(aq)
Since there is an equal number of each element in the reactants and products of 2AlCl3(aq) + 3Na2S(aq) = Al2S3(aq) + 6NaCl(aq), the equation is balanced.
Thus our required equation is
2AlCl3(aq) + 3Na2S(aq) = Al2S3(aq) + 6NaCl(aq)
Would acetaminophen give a positive phenol test?
Since it contains a phenol group, acetaminophen will give a positive phenol test when ferric chloride is added. Salicylic acid remains unreacted and causes a color change when it reacts with ferric chloride.
What is phenol?Phenol is primarily used in the manufacture of phenolic resins as well as nylon and other synthetic fibers.
It is also used as a disinfectant and antiseptic, as well as in medicinal preparations such as mouthwash and sore throat lozenges.
Acetaminophen will give a positive phenol test when ferric chloride is added because it contains a phenol group. When salicylic acid reacts with ferric chloride, it remains unreacted and causes a color change.
Thus, it can be concluded that yes, positive phenol test can be taken in case of acetaminophen.
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Convert a length of 22.0 m to inches
Answer:
866.142 inches
Explanation:
By formula
