Answer:
ion now i jus want points sorry
Explanation:
Based on the Lewis electron-dot diagrams of n2 and n2h4, compare the length of the nitrogen-to-nitrogen bond in n2 with the length of the nitrogen-to-nitrogen bond in n2h4.
Answer:
The bond length of n2h4 is longer than n2
Explanation:
The triple bond in N2 has a pulling effect and greater force bringing the nitrogens closer than the N2H4 nitrogen bond, which has a lesser force leaving them further apart.
A sample of N2H4 has a mass of 25g. Identify the numerical quantity that is needed to convert the number of grams of N2H4 to the number of moles of N2H4. (You do not need to do the actual calculation.)
A sample of aluminum foil contains 7.90 x 10^23 atoms. What is the mass of the foil?
Answer:
35.3 g
Explanation:
Step 1: Given data
Number of atoms of aluminum: 7.90 × 10²³ atoms
Step 2: Calculate the number of moles corresponding to 7.90 × 10²³ atoms of aluminum
We will use Avogadro's number: there are 6.02 × 10²³ atoms of aluminum in 1 mole of atoms of aluminum.
7.90 × 10²³ atoms × (1 mol/6.02 × 10²³ atoms) = 1.31 mol
Step 3: Calculate the mass corresponding to 1.31 moles of aluminum
The molar mass of Al is 26.98 g/mol.
1.31 mol × 26.98 g/mol = 35.3 g
Describe how a constant volume calorimeter can be used to measure the heat transferred from a burning piece of coal to cool water. Justify your response in two or more complete sentences.
Answer:
See complete explanation.
Explanation:
Hello.
In this case since the calorimeter is known as a device designed in order to provide measurements regarding the amount of heat required or transferred during chemical or physical process via the temperature change for the measured mass recorded by the calorimeter. Thus, when exothermic chemical reactions are carried out inside calorimeters the temperature is increased as they release heat whereas endothermic chemical reactions produce a temperature decrease since heat is absorbed.
In such a way, for a burning piece of coal which is releasing heat due to its combustion, we can compute the heat transferred to the water by reasoning that the heat released by the coal is gained by the water so the following relationship can be written:
[tex]Q_{coal}=-Q_{water}[/tex]
Which can be also written by:
[tex]m_{coal}C_{coal}\Delta T_{coal}=-Q_{water}[/tex]
Whereas by knowing the mass, specific heat at constant volume and the temperature change for the coal, we can compute the transferred heat to the water.
Best regards.
Answer:
Calorimeter is a device used to measure the amount of heat involved in a chemical or physical process. For example, when an exothermic reaction occurs in solution in a calorimeter, the heat produced by the reaction is absorbed by the solution, which increases its temperature. When an endothermic reaction occurs, the heat required is absorbed from the thermal energy of the solution, which decreases its temperature. The temperature change, along with the specific heat and mass of the solution, can then be used to calculate the amount of heat involved in either case.
Explanation:
Draw what comes to mind when you think of the word "atom."
Answer:
I think of when I hear the word "atom" I think of the building block of life
Explanation:
"hope this helps"
A solution containing HCI would likely have
a high pH and a low pOH.
a low pH and a high pOH.
a high pH and a high pOH.
a low pH and a low pOH:
Plz help
Answer:
B) A low pH and a high pOH.
Explanation:
Took the quiz.
Which of these isotopic notations represents an anion?*
Answer:
a option
Explanation:
i think this..... ...
Answer:
A is correct
Hope its help you
Explanation:
Mark me as brainliest.A dialysis unit is being designed. It will consist of a large number of small hollow fibers arranged in parallel. Blood will flow inside the fibers, each of which is 30 cm long. It is desired that the hold-up volume (the volume of blood needed to fill all the fibers) should be no more than 80 ml, and that the total pressure drop across the fibers should be no more than 105 dyne/cm2 at a total flow rate of 50 ml/s. If the blood viscosity is 3.5 cP and the density of the blood is 1.05 g/cm3, how many fibers should be used, and of what diameter should they be, so as to meet the design conditions
Answer:
Explanation:
Given information:
A designed dialysis unit consists of a large no of small hollow fibers,
Considering the one fiber,
By using the volume of blood, we have :
[tex]V =\dfrac{\pi}{4}\times D^2 \times L[/tex]
where:
L = 30cm = (30× 10) mm = 300 mm
Volume = 80 ml = 80 × 10³ mm
From the above equation, making D the subject, we have:
[tex]4 V ={\pi}\times D^2 \times L[/tex]
[tex]D^2 =\dfrac{4 V }{{\pi}\times L}[/tex]
[tex]D^2 =\dfrac{4 \times 80 \times 10^3 }{ \pi \times 300}[/tex]
D² = 339.53
[tex]D = \sqrt{339.53}[/tex]
D = 18.43 mm
D = 1.843 cm
However, suppose we consider the laminar flow, the pressure loss in a single fiber can be determined as follows:
[tex]\Delta p = \rho g h_f= \dfrac{32* \mu *\overline u*l }{D^2}[/tex]
where;
[tex]\overline u = \dfrac{4 \times 50 \times 10^3}{\pi \times (18.43)^2}[/tex]
[tex]\overline u = \dfrac{200000}{1067.088755}[/tex]
[tex]\overline u =187.43 \ mm/sec[/tex]
[tex]\overline u =18.743 \ cm/sec[/tex]
Recall:
[tex]\Delta p = \dfrac{32* \mu *\overline u*l }{D^2}[/tex]
[tex]\Delta p = \dfrac{32* 3.5 \times 10^{-2} *18.743*30 }{1.843^2}[/tex]
[tex]\Delta p = \dfrac{629.7648 }{3.396649}[/tex]
[tex]\Delta p =185.41 \ dyne/cm^2[/tex]
Finally, the number of needed to be used = [tex]\dfrac{p}{\Delta p}[/tex]
= [tex]\dfrac{10^5 \ dyne /cm^2}{185.41\ dyne /cm^2}[/tex]
= 539.35
1)If I mixed salt in water I would expect the salt to:
2) If I mixed starch in water I would expect the starch to:
Answer:
1)If I mixed salt in water I would expect the salt to: dissolve.
2) If I mixed starch in water I would expect the starch to: remain undissolved.
Explanation:
Hello,
In this case, since salt, which is commonly known as sodium chloride (NaCl) is an ionic compound, it is very likely to get dissolved in water, therefore, we would expect the salt to dissolve and form a liquid solution.
Moreover, since start is mainly composed by C-C, C-O and C-H bonds which are nonpolar, it we can say it is usually insoluble in water, therefore we will expect starch to remain undissolved but undergoing a process called gelatinization in which a suspension in formed until a slightly solid consistency.
Best regards.
Which of the following is the correct calculation for determining the density of an object with a mass of 54 g and a volume of 6 mL?
Answer:
[tex]\rho =9g/mL[/tex]
Explanation:
Hello,
In this case, since the density is computed via the division of the mass by the volume:
[tex]\rho =\frac{m}{V}[/tex]
For the given mass of 54 g and volume of 6 mL, the density turns out:
[tex]\rho =\frac{54g}{6mL}\\ \\\rho =9g/mL[/tex]
Best regards.
Write this number in scientific notation
100.1
Answer:
1.001 x 10²
Explanation:
thats it broski
A certain chemical compound has a molar mass of 106.05 g/mol. Calculate the mass in grams of 2.58 moles of this compound.
Answer:
273.609
Explanation:
1 mole of a substance is equal to molar mass of the substance
1 mole of substance = 106.05
2.58 moles = x
then you cross multiply to get your answer
PSYCHOLOGYWhen one individual perceives the events of a car crash to be different than another person, which of the following will most likely be occurring? A. One individual is present in a different context or situation than the other person, causing them to have different perceptions. B. One individual is experiencing an alternate reality, which results in a distorted perception. C. Individual perceptions could be influenced by differences in prior knowledge or experience. D. The perception of one individual is distorted because one in five individuals has problems with perceptual accuracy.
Answer:
the answer is c
Explanation:
Answer:
C. Individual perceptions could be influenced by differences in prior knowledge or experience.
Explanation:
PLEASE HELP!! 100 pts! There are both public and private crime labs in the United States. In your own words, explain the difference in how these crime labs process
evidence and the benefits and drawbacks of each type. Proper spelling, grammar, and sentence structure are expected!
Answer:
The forensic laboratory system in the United States consists of private and public labs. One well-known public lab is the FBI (the Federal Bureau of Investigation) Public labs are mostly run by police officers and state employees, while private labs are organized as a fee-for-service and they are small with a few large and medium=sized operations.
Explanation:
Idk and it's not even 100 points but I hope this helps.
Migration rates, birth rates, and death rates are all ways to measure changes in __________. A. urbanization B. population C. weather D. climate
Answer:
Population
Explanation:
PLEASE HELP ASP...Patsy wants to find out that it would take her to walk a 10 K (10 km) if she maintains a
pace of 6.5 km/hr. How long will it take her?
Answer:
I tried doing the math I believe it is 0.65 min. converted is an 1 hour and 5 min
what is the atomic number of an element containing 12 neutrons and having a mass number of 24
assume an object A with a mass of 66.789 g and a volume of 10.1 mL. what is its density?
Answer: 6.61
Explanation:
Which of the following statements about compounds is true?
A- Each Compound contains only one element.
A- Each Compound contains only one element.
B- Compound can be classified as either heterogenous or homogenous.
C- A Compound has a defined ratio by mass of the elements that it contains
D- Compounds Vary in chemical composition depending on the sample size.
Explanation:
A and D is the answer
Hope the answer is right
Write the following numbers in scientific notation.
Type your answer using one of the following formats:
1.2e-3 for 0.0012
1.20e+2 for 120.
(a) 0.000 589 0
(b) 50 000.0
(c) 0.000 007 050
Answer:
for points sorry
Explanation:
How does geothermal energy differ from solar energy? (3 points)
Geothermal energy is cooler and denser than solar energy.
Geothermal energy comes from the internal heat of Earth.
Geothermal energy is transmitted through the atmosphere.
Geothermal energy results from radiation of electromagnetic waves
Answer:
B: geothermal energy comes from eternal heat of earth.
Explanation:
Can someone please help?
Answer:
C
Explanation:
Please see the attached picture for the worked solution.
*I am unable to send it as a text and thus it is attached as an image.
I need help filling out nitrogen
Which of the following statements is not true about the ways in which our bodies are able to block pain? A. The release of endorphins in the body assists in alleviating pain. B. Specific neural activity can limit incoming pain signals, alleviating pain. C. Information from other sensory systems can close the pain gate, alleviating pain. D. A neural pathway found in the frontal lobe assists in alleviating pain.
Answer:
D. A neural pathway found in the frontal lobe is not true
Explanation:
Had a psych lecture and test on this, I got the question right. If it's wrong I'm sorry.
A neural pathway found in the frontal lobe assists in alleviating pain isn't true about the ways in which our bodies are able to block pain
The body system have different characteristics and methods by which they
handle conditions encountered which may be as a result of external factors
such as introduction of foreign bodies into the blood or different forms of injuries.
The white blood cells and other hormones have different properties and
cells such as macrophages ,mast cells, endorphins which helps to ensure we
are alright and in good shape
The body releases chemicals known as endorphins to assist in alleviating
pain. Specific neural activity can limit incoming pain signals or process
information from other sensory systems to help alleviate the pain however,
there is no neural pathway in the frontal lobe which reduces pain .
Read more on https://brainly.com/question/17916563
1 point
A student is classifying a group of unknown solids by whether or not they float or sink in water.
Which property is the student using to classify the solids?
mass
solubility
density
melting point
Q1. Which one of the following has the element name and symbol incorrectly
matched?
A. Br, bromine
B. Fe, iron
C. Cu, copper
D. P, potassium
Answer:
D. P, Potassium
Explanation:
Potassium on the periodic table is actually K
science is a growing body of knowledge that often relies on previous knowledge true or false
Answer:
false
Explanation:
True or False? The following set of quantum numbers is acceptable (0, 0, 0, +1/2). Explain.
This following set of quantum numbers
Answer:
False
Explanation:
The values of the principal quantum number range from 1- infinity. This implies that there is no such thing as an energy level with n=0.
Hence this can not be an acceptable set of quantum numbers when n=0.
The force of gravity pulls down on your house with a total force of 300,000 newtons. The force of gravity pulling down on your house would be exactly twice as much if your house: a Had twice as much mass b Was twice as tall c Had twice as much volume d Covered twice as much area
Answer: B. Was twice as tall
Explanation: The strength of the gravitational force between two objects depends on two factors, mass and distance. If the distance is doubled, the force of gravity is one-fourth as strong as before.
The force of gravity pulling down on your house would be exactly twice as much if your house was twice as tall. Hence option b is correct.
What is gravity?Gravity is defined as a basic interaction that pulls everything with mass or energy in the same direction. All objects with mass, including our Earth, really bend and curve spacetime, which is what causes gravity to pull you toward the ground. The moon is maintained in its orbit around Earth by gravity, as are the planets in their orbits around the sun.
The force of gravity, which is directly dependent on the masses of the two objects, is inversely correlated with the square of the distance between two objects. This translates to an increase in gravity force with mass but a decrease in gravity force with increasing distance between objects. The force between two objects doubles if the mass of one thing doubles.
Thus, the force of gravity pulling down on your house would be exactly twice as much if your house was twice as tall. Hence option b is correct.
To learn more about gravity, refer to the link below:
https://brainly.com/question/4014727
#SPJ2
Titanium occurs in the magnetic mineral ilmenite (FeTiO3), which is often found mixed up with sand. The ilmenite can be separated from the sand with magnets. The titanium can then be extracted from the ilmenite by the following set of reactions:
FeTiO3(s)+3Cl2(g)+3C(s)→3CO(g)+FeCl2(s)+TiCl4(g)TiCl4(g)+2Mg(s)→2MgCl2(l)+Ti(s)
Suppose that an ilmenite-sand mixture contains 20.2 % ilmenite by mass and that the first reaction is carried out with a 91.6 % yield.
If the second reaction is carried out with an 86.0 % yield, what mass of titanium can be obtained from 1.40 kg of the ilmenite-sand mixture?
Answer:
.222 g
Explanation:
FeTiO3(s)+3Cl2(g)+3C(s) → CO(g)+FeCl2(s)+TiCl4(g)
TiCl4(g)+2Mg(s) → 2MgCl2(l)+Ti(s)
1.40 g of mineral will contain pure ore of .202 x 1.4 g = .2828 g
ilmenite mass = .2828 g of illemnite mass
product after first reaction = .916 x .2828 = .259 g
product after 2 nd reaction = .86 x .259 g
= .222 g
The mass of titanium that can be obtained from 1.40 kg of the ilmenite-sand mixture is 70.27 g
From the question,
We are to determine the mass of titanium can be obtained from 1.40 kg of the ilmenite-sand mixture
Also from the question, we have that
An ilmenite-sand mixture contains 20.2 % ilmenite by mass
That means,
The mass off ilmenite present in the 1.40 kg ilmenite-sand mixture is
= [tex]\frac{20.2}{100} \times 1.40 \ kg[/tex]
[tex]= \frac{20.2}{100}\times 1400 \ g[/tex]
= 20.2 × 14
= 282.8 g
∴ The mass of ilmenite present in the ilmenite-sand mixture is 282.8 g
From the first reaction
FeTiO₃(s) + 3Cl₂(g) + 3C(s) → 3CO(g) + FeCl₂(s) + TiCl₄(g)
We will calculate the mass of TiCl₄ produced
First, we will determine the number of moles of ilmenite (FeTiO₃) present
From the formula
[tex]Number\ of \ moles = \frac{Mass }{Molar\ mass}[/tex]
Molar mass of ilmenite (FeTiO₃) = 151.71 g/mol
∴ Number of moles of ilmenite = [tex]\frac{282.8}{151.71 }[/tex]
Number of moles of ilmenite = 1.864 moles
From the balanced chemical equation in the first reaction
1 mole of ilmenite (FeTiO₃) reacts to produce 1 mole of TiCl₄
∴ 1.864 moles of ilmenite (FeTiO₃) will produce 1.864 moles of TiCl₄
Now, for the mass of TiCl₄ produced
From the formula
Mass = Number of moles × Molar mass
Molar mass of TiCl₄ = 189.679 g/mol
∴ Mass of TiCl₄ = 1.864 × 189.679
Mass of TiCl₄= 353.561656 g
But, from the question,
The reaction has a yield of 91.6%
∴ Mass of TiCl₄ produced = [tex]\frac{91.6}{100} \times 353.561656[/tex]
Mass of TiCl₄ produced = 0.916 × 353.561656
Mass of TiCl₄ produced = 323.8624 g
From the second reaction
TiCl₄(g) + 2Mg(s) → 2MgCl₂(l) + Ti(s)
We will determine the mass of Titanium (Ti) produced
From the balanced chemical equation for the reaction
1 mole of TiCl₄ reacts to produce 1 mole of Titanium (Ti)
The number of moles of TiCl₄ produced in the first reaction is
= 91.6% × 1.864 moles
= 0.916 × 1.864
= 1.7074242 moles
Since
1 mole of TiCl₄ reacts to produce 1 mole of Titanium (Ti)
∴ 1.707424 moles of TiCl₄ will react to produce 1.707424 moles of Titanium (Ti)
But, from the question
The yield of the second reaction is 86.0%
∴ The number of moles of Titanium (Ti) produced is [tex]\frac{86.0}{100}\times 1.707424[/tex]
Number of moles of Ti produced = 0.86 × 1.707424
Number of moles of Ti produced = 1.468 moles
Now, we will determine the mass of Titanium (Ti) produced
From the formula
Mass = Number of moles × Molar mass
Molar mass of Titanium = 47.867 g/mol
∴ Mass of Titanium produced = 1.468 × 47.867
Mass of Titanium produced = 70.27 g
Hence, the mass of titanium that can be obtained from 1.40 kg of the ilmenite-sand mixture is 70.27 g
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(a) Which of the following atoms is smallest: vanadium, chromium or tungsten? (b) Which of these atoms has the highest ionization energy? (c) Which is the most electronegative?
Answer: (a) chromium (b) tungsten (c) tungsten
Explanation:
As we move towards the right in the periodic table, atomic sizes decreases and electronegativity increases accordingly. Similarly, atomic sizes increases down the group. Hence chromium is smaller than tungsten.
However, tungsten is more electronegative than the other metals listed, as a result of this, it also has the highest first ionization energy. Hence the answer above.
