Answer:
id say 4
Explanation:
hope this is right!
-Jules
What is the heat of a reaction, in joules, with a total reaction mixture volume of 73.0 mL if the reaction causes a temperature change of 4.4 oC in a calorimeter
This question is incomplete, the complete question is;
What is the heat of a reaction, in joules, with a total reaction mixture volume of 73.0 mL if the reaction causes a temperature change of 4.4 °C in a calorimeter?
Assume that the reaction mixture has a density of 1.00 g/mL and a specific heat of 4.184 J/g-oC. The calorimeter has a heat capacity of 10.0 J/oC.
Answer: the heat of the reaction is 1387.9 J
Explanation:
Given that;
Volume = 73.0 mL
density = 1.00 g/mL
specific heat of solution = 4.184 J/g-oC
calorimeter has a heat capacity of 10.0 J/oC.
Temperature change ΔT = 4.4 °C
the heat of a reaction = ?
Total heat of the reaction will be equal to the amount of heat absorbed/lost by the solution and the calorimeter.
so heat of reaction q = mC_solΔT + C_alΔT
where m is mass, C_sol is specific heat capacity of the solution, ΔT temperature change and C_cal is heat capacity of calorimeter.
so first we calculate our mass;
mass = volume × density
= 73.0 mL × 1.00 g/mL
= 73.0 g
so we substitute into our equation;
q = mC_solΔT + C_alΔT
q = (73 × 4.184 × 4.4) + ( 10 × 4.4 )
q = 1343.9008 + 44
q = 1387.9 J
Therefore the heat of a reaction is 1387.9 J
Plssssssssssssssss help me
Answer:
Answer is True
I hope its help for you
have a great day
In 2011, the number of transplants in the United States was 26,745, and the number of donors was 14,146. What is most likely the reason that there were more transplants than donors? The data that were used for comparison was not compatible. O The data were not recorded accurately There were retransplants done. © Each donor gave away more than one organ.
Answer:
Each donor gave away more than one organ.
Explanation:
edge 2021
Answer: D
Explanation:
You mix 55 mL of 1.00 M silver nitrate with 25 mL of 0.84 M sodium chloride. What mass of silver chloride should you form
Answer:
mass of silver chloride (AgCl) = 3.0135 grams
Explanation:
The chemical equation is:
[tex]AgNO_{3(aq)} + NaCl_{(aq)} \to AgCl_{(s)} + NaNo_3_{aq)}[/tex]
No. of mole = molarity × volume
For AgNO3:
No. of moles = 1.00 × 0.055
= 0.055 moles
No. of moles of NaCl = 0.84 × 0.025
= 0.021 moles
From the equation:
[tex]1 \ mol e \ of \ AgNO_3 \ react \ with \ 1 \ mole \ o f \ NaCl[/tex]
Therefore, 0.055 moles of AgNO3 react with 0.055 moles of NaCl
Here;
NaCl serves as the limiting reactant
Thus,
1 mole of NaCl will react with AgNO3 to yield 1 mole of AgCl
∴
0.021 moles of NaCl react with AgNO3 to yield 0.021 moles og AgCl
mass of AgCl = no of moles × molar mass
= 0.021 × 143.5
= 3.0135 grams
What is the percent composition of oxygen in
beryllium nitrate, Be(NO3)2?
The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is 72.166%.
What is percent composition ?
Percent composition is very straightforward. Percent composition indicates the percentage of each element in a compound by mass. A chemical compound is made up of two or more elements.
Percent composition is important because it allows us to calculate the percentage of each element in a compound. Here, the quantity is measured in terms of grams of the elements present.
For example, if we know the mass and chemical composition of a substance, we can find out the number of moles and calculate the number of atoms or molecules in the sample.
In Be(NO3)2 the percent composition of Beryllium (Be) is 6.775%, Nitrogenium (N) is 21.060% and Oxygenium (O) is72.166%.
Thus, The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is 72.166%.
To learn more about the percent composition, follow the link;
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can u pls help me with this question
Answer:
C
Explanation:
Condensation
Answer:
C....... ...................
can u pls help me with this question
Answer:
I think the answer is b
Explanation:
the paragraph states, that it is an experiment to see if there is any oxygen in the water
Before the work of Albert Einstein and other prominent scientists of the early 1900's, the predominant view among
physicists was that light is:
Answer:
wave
Explanation:
Answer quick please
Answer:
In my perspective I think its D because Electrical energy is converted to light and heat
A mixture can be separated into simpler parts based on the components of the mixture's _____ properties.
volatile
reaction
physical
chemical
Answer:
Chemical is best answer
Explanation:
Mark me as brilliant and thank you
Please
Answer:
chemical is the answer
Explanation:
What was a key discovery in the advancement me up early information transfer
Answer:
The transfer was essential to understand the mutation and the possibility of new, more resistant strains in microorganisms.
Explanation:
the transfer of microorganisms is based on the transfer of genetic data through conductive pathways that penetrate the membranes, called pili or genetic bridges.
These mutated genes with higher resistance are transmitted and resistance is generated in entire populations and even species.
What is the difference between electric current and static electricity?
Answer:
In static electricity the charges are at rest and they are accumulating on the surface of the insulator. Whereas in current electricity the electrons are moving inside the conductor.
Answer: Current electricity involves a flow of electrons; static electricity involves a single transfer of electrons.
Explanation:
hopes this helps
What is true of a covalent bond? (4 points)
Answer:
44
Explanation:
Triangle K L J. Side K L is 23.1 feet, J L is 20.1 feet, J K is 16.8 feet. Angle K is 58 degrees, L is 45 degrees, J is 77 degrees. Triangle E F G. Side E F is 6.7 feet, F G is 5.6 feet, G E is blank. Angle E is 45 degrees, F is 77 degrees, G is 58 degrees.
Given these similar triangles, what is the common ratio of triangle LJK to triangle EFG?
1.5
2
3
4
the answer is 3
"C"
Answer:
The answer is C or 3
Explanation:
I took the assignment
Answer:
3 or C on edge
Explanation:
A chemist determined by measurements that 0.030 moles of barium participated in a chemical reaction. Calculate the mass of barium that participated in the chemical reaction. Round your answer to 2 significant digits.
Answer: 4.1 g of barium precipitated.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}[/tex]
Given : moles of barium = 0.030
Molar mass of barium = 137 g/mol
[tex]0.030=\frac{x}{137}[/tex]
x= 4.1 g
Thus there are 4.1 g of barium that precipitated.
What does a mountain ecosystem host?
A. one ecosystem with a variety of wildlife
B. one ecosystem with a variety of plants
C. three or more ecosystems which can’t host plant life
D. three or more distinct ecosystems
Answer: D.
Explanation: :)
Answer:
d
Explanation:
which describes where fog forms
Answer:
It is A.
Explanation:
found at ground
hope this helps
Define international system of units , where does the system originate
Answer:
The International System of Units (SI) is originated in France by frenches and originally was called a metric system of measurements. It provides definitions of various units of measurement such as weight, distance, electric current, temperature, and others which is widely accepted in the different fields of science and technology.
It is the system that is extended and derived from the french metric system of measurement is accepted in 1960 by convention 44 nation of the world to use particular unit of measurement worldwide to avoid confusion.
What volume, IN MILLILITERS, of 5.0M HCl solution is required to react with 3.00 g or magnesium metal?
The volume of HCl = 2.10⁴ mL
Further explanationGiven
5.0 M(mol/L) HCl solution
3 g of Mg
Required
Volume of HCl
Solution
Reaction
Mg + 2HCl ⇒ MgCl₂ + H₂
mol of Mg (Ar=24 g/mol) :
mol = mass : Ar
mol = 3 : 24
mol = 0.125
From the equation, mol ratio of Mg : HCl = 1 : 2, so mol HCl :
= 2/1 x mol Mg
= 2 x 0.125
= 0.25
Molarity : mol solute per liters solution
M = m x V
V = M : m
V = 5 mol/L : 0.25
V = 20 L = 2.10⁴ mL
7. Based on the conclusion in question 5, what type of leaves would be most beneficial for plants indigenous (native) to a desert?* O Wide leaves, with high surface area O Thin narrow leaves, with low surface area It wouldn't make a difference - any leaves will work in any area. PLEASE HElP ASAP PLEASEEEEEEE
Answer:
I don't know what question 5's conclusion is but if i were to take a guess here i would say wide leaves with a high surface area
Explanation:
to soak up water and maybe provide shade for the roots and dirt under the plant.
Which of the following is most likely to produce heat energy?
A
Momentum
B
Convection
C
Interaction
D
Magnetism
Answer:
B.Convection
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
Answer:
B.
Explanation:
A pressure of 125,400 pa is equal to what kPa
Answer:
125.4 kilopascals
Explanation:
wkdje
Answer:
125,400 pa = 125.4 kPa
Explanation:
1 pa = 0.001 kPa
&
1 kPa = 1,000 pa
In the Lewis symbol for a sulfur atom, there are __________ paired and __________ unpaired electrons. A) 2, 2 B) 4, 2 C) 2, 4 D) 0, 6 E) 5, 1 Answer: B
Answer:
C) 2, 4.
Explanation:
Hello!
In this case, since the sulfur atom has six electrons at its outer shell, it suggests it needs to gain two electrons in order to attain a complete octet, that is why it has 2 paired electrons.
Moreover, since two electrons are paired, then 4 electrons will remain unpaired; therefore the answer would be C) 2, 4.
Best regards!
gThe mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. What is the molarity of KNO in the solution
Answer:
0.595 M
Explanation:
The number of moles of water in 1L = 1000g/18g/mol = 55.6 moles of water.
Mole fraction = number of moles of KNO3/number of moles of KNO3 + number of moles of water
0.0194 = x/x + 55.6
0.0194(x + 55.6) = x
0.0194x + 1.08 = x
x - 0.0194x = 1.08
0.9806x= 1.08
x= 1.08/0.9806
x= 1.1 moles of KNO3
Mole fraction of water= 55.6/1.1 + 55.6 = 0.981
If
xA= mole fraction of solvent
xB= mole fraction of solute
nA= number of moles of solvent
nB = number of moles of solute
MA= molar mass of solvent
MB = molar mass of solute
d= density of solution
Molarity = xBd × 1000/xAMA ×xBMB
Molarity= 0.0194 × 1.0627 × 1000/0.981 × 18 × 0.0194×101
Molarity= 20.6/34.6
Molarity of KNO3= 0.595 M
What is the molecular formula of a compound with the empirical formula of CH2F and a gram formula mass of 66.0 g
Answer:
The molecular formula of the compound is C₂H₄F₂ or CH₃CHF₂
Explanation:
From the question given above, the following data were obtained:
Empirical formula of the compound = CH₂F
Fórmula mass of compound = 66 g/mol
Molecular formula of the compound =?
The molecular formula of the compound can be obtained as follow:
Molecular formula = [Empirical formula]ₙ
Molecular formula = [CH₂F]ₙ
[CH₂F]ₙ = 66
[12 + (2×1) + 19] n = 66
[12 + 2+ 19]n = 66
33n = 66
Divide both side by 33
n = 66/33
n = 2
Molecular formula = [CH₂F]ₙ
Molecular formula = [CH₂F]₂
Molecular formula = C₂H₄F₂
Thus, the molecular formula of the compound is C₂H₄F₂ or CH₃CHF₂
A stock solution of ammonia in water is 28 wt% NH3. The Formal Weight (FW) of NH3 is 17.03 g/mol). The solution density at room temperature is 0.90 g/mL. What is the molarity of the solution in units of mol/L
Answer:
[NH₃] = 14.7 mol/L
Explanation:
28 wt% is a type of concentration that indicates that 28 g of ammonia is contained in 100 g of solution.
Let's determine the amount of ammonia:
28 g . 1 mol / 17.03g = 1.64 moles of NH₃
You need to consider that, when you have density's data it is always referred to solution:
Mass of solution is 100 g, let's find out the volume
0.90 g/mL = 100 g /V
V = 100 g / 0.90mL/g → 111.1 mL
We convert the volume to L → 111.1 mL . 1 L/1000mL = 0.1111 L
mol/L = 1.64 mol/0.1111L → 14.7 M
mol/L = M → molarity a sort of concentration that indicates the moles of solute in 1L of solution
what statements best describe the work of marie and pierre curie? check all that apply
Answer:
Discovered two new radioactive elements They came up with the term radio activity.conducted experiments with uranium-containing
Explanation:
Analysis of a salt results in the following composition: 3.47 g of Sodium; 2.12 g of Nitrogen; and 7.27 g of Oxygen. What is the simplest formula for this salt
Answer:
NaNO₃
Explanation:
Data obtained from the question include:
Mass of sodium (Na) = 3.47 g
Mass of nitrogen (N) = 2.12 g
Mass of oxygen (O) = 7.27 g
Simplest (empirical) formula =?
The simplest formula for the salt can be obtained as follow:
Na = 3.47 g
N = 2.12 g
O = 7.27 g
Divide by their molar mass
Na = 3.47 / 23 = 0.151
N = 2.12 / 14 = 0.151
O = 7.27 / 16 = 0.454
Divide by the smallest
Na = 0.151 / 0.151 = 1
N = 0.151 / 0.151 = 1
O = 0.454 / 0.151 = 3
Simplest formula = NaNO₃
Thus, the simplest formula for the salt is NaNO₃
PLEASE HELP!! PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP’
LEWIS STRUCTURES CHEMISTRY!
Answer:
B is the answer because it doesn't matches the num of valence electrons
Answer:
No, because it doesn't match the total number of valence electrons.
Explanation:
The total valence electrons should be 10. But if you add all the valence electrons it gives you 12
what is the similaritu of chicken skin to human skin?
Answer:
Explanation:
12.9 micrograms of iodine in both
