Answer:
According to the following balanced reaction, how many moles of HNO3 are formed from 8.61 moles of NO2 if there is plenty of water present?
Explanation:
According to the following balanced reaction, how many moles of HNO3 are formed from 8.61 moles of NO2 if there is plenty of water present?
2. Which of these activities would most likely be carried out by a civil engineer who
specializes in environmental engineering?
A. testing steel beams for a large bridge
B. brainstorming ways to prevent landslides on steep slopes
C. designing a new system for unloading cargo from rail cars
D. developing a robot to search for survivors of natural disasters
Applying physical and scientific concepts to the design, development, and maintenance of both the artificially produced environment as well as the naturally occurring built environment is known as civil engineering. The correct option is B.
What does a civil engineer do?In both the public and private sectors, civil engineers conceptualize, design, develop, supervise, run, and maintain infrastructure projects and systems, such as highways, buildings, airports, tunnels, dams, bridges, and water supply and sewage treatment systems.
Traditionally, civil engineering has been divided into a variety of sub-disciplines. It is defined to separate non-military engineering from military engineering and is regarded as the second-oldest engineering subject after military engineering.
A civil engineer make brainstorming ways to prevent landslides on steep slopes. In some locations, a civil engineer is qualified to do land surveying; in other locations, surveying is only permitted for building purposes without a different licence.
Thus the correct option is B.
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1.Which phase of matter will maintain a constant volume, but not a constant shape?
solid
liquid
Gas
plasma
5A. Particles in a solid are closer/farther apart than they are in a liquid
or gas which are closer/farther apart.
5B. Conduction involves the collision of particles in less/more dense
materials collide less/more often than particles in less/more dense
materials. For example, solids conduct thermal energy faster/slower
than liquids or gases because the particles are closer or farther apart
and collide frequentiylrarely.
Answer:
Wait so what is the answer, before any one says any thing I knw this is Not a question so plz don't say nothing about it.
Explanation:
Particles in a solid are closer than they are in a liquid or gas which are farther apart. Conduction involves the collision of particles in more dense materials.For example, solids conduct thermal energy faster than liquids or gases because the particles are closer and collide frequently.
What is conduction?Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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Plants need sunlight to make food during the process of:
Photosynthesis
Respiration
Nuclear fusion
Digestion
the answer is photosynthesis
The structures of TeF4 and TeCl4 in the gas phase have been studied by electron diffraction (S. A. Shlykov, N. I. Giricheva, A. V. Titov, M. Szwak, D. Lentz, G. V. Girichev, Dalton Trans., 2010, 39, 3245).
a. Would you expect the Te i X (axial) distances in these molecules to be longer or shorter than than Te i X (equatorial) distances? Explain briefly.
b. Which compound would you predict to have the smaller X(axial) i Te i X(axial) angles? The smaller X(equatorial) i Te i X(equatorial) angles? Explain briefly.
Answer:
See explanation
Explanation:
Two structures are pictured in the image attached, structure 2 is a more stable structure for TeF₄ or TeCl₄ since the lone pair in the structure is present at an equatorial position. Note that the structure of the compound is based on a trigonal bipyramid but of the structure type AX4E, where the lone pair could be positioned at axial or equatorial positions as shown in the images attached.
As a result of repulsion between electron pairs, the bond distance between Te - X(axial) is greater than Te-X (equatorial). This implies that the Te - X(axial) bonds are longer than Te - X(equatorial) bonds.
In answering the question, we must take cognisance of the fact fluorine is more electronegative than chlorine. This implies that fluorine will draw more electron density towards itself than chlorine and this shortens the bond length.
The structures of the both compounds are based on a trigonal bipyramid with a bond angle of 90° for axial position and 120° for the equatorial position.
Owing to the greater electo negativity of fluorine, both the fluorine F-axial and F-equatorial bonds of TeF4 are shorter than the Cl-axial and Cl-equatorial bonds of TeCl4. Hence the axial and equatorial angles in TeF4 are smaller than the axial and equatorial bond angles in TeCl4 due to the greater electro negativity of the fluorine atom.
What are the 4 parts of cell theory???? List like
1.
2.
3.
4.
Answer:
1. Cells contain DNA that is passed cell to cell during cell divison.
2. Cells are similiar in chemical composition and reactions that maintin homeostasis.
3. All basic chemical and physiological functions are carried out inside the cell.
4. Cell activity depends on the oragnelles withen the cell.
Hope this helps!
A 2.50M solution of NaOH is diluted from a volume of 0.890L to a volume of 2.00L, What is the new molarity?
O 2.78011
O 1.11M
O 5.62M
O 4.5M
Answer:
1.11 M
Explanation:
M₁V₁ = M₂V₂
Step 1: Define
Molarity₁ = 2.50 M
Volume₁ = 0.890 L
Molarity₂ = unknown
Volume₂ = 2.00 L
Step 2: Substitute and Evaluate for M₂
(2.50 M)(0.890 L) = (M₂)(2.00 L)
2.225 = M₂(2.00 L)
M₂ = 1.1125 M
Step 3: Simplify
We are given 3 sig figs.
1.1125 M ≈ 1.11 M
40.3 degrees Fahrenheit. Each hour the temperature decreases by 2.09 What is the
temperature after 2 hours?
what is circulatory role and funcation
Answer:
Transport of gases and nutrients
Explanation:
The circulatory system includes all the vessels that transport blood around the body as well as the blood itself. Sometimes the heart and lungs are also included as part of the circulatory system.
The vessels of the circulatory system are involved in the transport of blood throughout the body. Blood carries the necessary gases to the cells (oxygen) and waste products (CO2) away. It also carries important nutrients to the cells and transports chemical messengers in the form of hormones to their sites of action.
What is an example of a poly-gastric organism?
Answer:
cow, sheep, goats, deer, elk
What is the mass of an object that has a density of 0.500 g/cm3 and a volume of 5.00 mL?
Answer:
The answer is 2.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density = 0.5 g/cm³
1 mL = 1 cm³
5 mL = 5 cm³
volume = 5 cm³
The mass is
mass = 0.5 × 5
We have the final answer as
2.5 gHope this helps you
You have an Iron atom with atomic mass 58 amu, how many neutrons
does it have?
Answer:
It has 32 neutrons
Explanation:
FAST PLEASE HELP All atoms of the same element must have the same number of
O protons.
O neutrons.
O compounds.
O electrons.
Answer: A. Protons
Explanation:
it is a way of thinking about the world, and is made up of a person's views and belief
Incomplete question. I inferred you want the term that fits this definition.
Answer:
A Worldview
Explanation:
Having a Worldview refers to an individual's perception or the way one thinks about the world, influenced by their attitudes and values.
This view of the world is made up of a person's views and beliefs which form their expectations about the world in which they live.
An organic compound of relative molecular mass 46,on analysis was found to contain 52.0% carbon, 13.3% hydrogen and 34.7% oxygen
(H=1,C=12,O=16)
calculate the empherical formulae and molecular formulae
Answer:
Empirical formula is C₂H₆O.
Explanation:
Empirical formula:
It is the simplest formula gives the ratio of atoms of different elements in small whole number
Given data:
Percentage of hydrogen = 13.3%
Percentage of carbon = 52.0%
Percentage of oxygen = 34.7%
Empirical formula = ?
Molecular formula = ?
Solution:
Number of gram atoms of H = 13.3 / 1.01 = 13 .17
Number of gram atoms of O = 34.7 / 16 = 2.17
Number of gram atoms of C = 52.0 / 12 = 4.3
Atomic ratio:
C : H : O
4.3/2.17 : 13.17/2.17 : 2.17/2.17
2 : 6 : 1
C : H : O = 2 : 6 : 1
Empirical formula is C₂H₆O.
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
n = 46 / 158
The relative molecular mass of compound is not correct.
Is oxidation an example of an extensive property or an intensive property? Explain.
Which of the following reasons explains why some cooking pors are made of metal, but their handles are made of wood? (4 points)
a
Both wood and metal have low thermal conductivity
Both wood and metal have high thermal conductivity
Wood has low thermal conductivity, and metal has high thermal conductivity
Wood has high thermal conductivity, and metal has low thermal conductivity
с
d
What is the mass number of the atom shown?
Answer:
21
Explanation:
Formula;
Mass number = number of protons + number of neutrons
= 9 + 12
= 21
Is chloroform a polar molecule? How do you know?
Answer:
A polar molecule does not have an even distribution of electrons. ... Therefore Chloroform is a polar molecule because it does not have an even distribution of molecules, and one end is more negatively charged (Cl) than another (H).
Explanation:
transport moves substances from an area of low concentration to an area of high concentration.
Answer:
Active Transport
Explanation:
In cellular biology, active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement. During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.
Answer:
active
Explanation:
i got it right
What is chromatography paper?
Answer:
paper chromatography is an analytical method used to separate colored chemicals or substances.It is primarily used as a teaching tool,having been replaced by other Chromatography methods ,such as thin layer chromatography.
to an atom.
Neutrons add only
a. mass
b.ions
C. positive charge
d. negative charge
Please select the best answer from the choices provided
A
В
С
D
Pls help fast due in 10 mins!!! :(((((((( ughhh please!
Answer:
The answer is A, Neutron adds only mass
A chemistry student is given 250.0 mL of clear aqueous solution at 42 C. He is told an unknown amount of a certain compound X is dissolved in the solution. The student allows the solution to cool to 25C. At that point, the student sees that a precipitate has formed. He pours off the remaining liquid solution, throws away the precipitate and evaporates the remaining liquid solution under vacuum. More precipitate forms. The student washes, dries, and weighs the additional precipitate. It weighs 8.75 g. Using only the information above, can you calculate the solubility of X at 25C? If yes, calculate it.
Answer:
No
Explanation:
The solubility of a solid in water refers to the amount of that solid that dissolves in water.
It is not possible to calculate the solubility of the solid because the student threw away the first precipitate that formed. We already have the volume of water, but having lost some mass of precipitate, it has become impossible to accurately determine the solubility.
Hence the answer provided above.
The Lewis structure of an oxygen atom should have _____________ dots drawn around the symbol .The Lewis structure of a calcium atom should have ____________ dots drawn around the symbol Ca. The Lewis structure of a nitrogen atom should have ___________ dots drawn around the symbol N. The Lewis structure of an aluminum atom should have ___________ dots drawn around the symbol Al. The Lewis structure of a fluorine atom should have _________ dots drawn around the symbol F.
Answer:
Oxygen- 6
Calcium-2
Nitrogen-5
Aluminum-3
Flourine-7
Explanation:
A Lewis structure or dot electron structure is a representation of an atom in which the valence electrons on the outermost shell of the atom are represented as dots.
These dots show the number of valence electrons as well as the group to which the atom belongs in the periodic table.
The Lewis structure of an oxygen atom should have 6 dots drawn around the symbol
The Lewis structure of a calcium atom should have 2 dots drawn around the symbol Ca
The Lewis structure of a nitrogen atom should have 5 dots drawn around the symbol N
The Lewis structure of an aluminum atom should have 3 dots drawn around the symbol Al
The Lewis structure of a fluorine atom should have 7 dots drawn around the symbol F
For Oxygen atomThe oxygen atom has 6 electrons in its outermost shell
Hence, the Lewis structure of an oxygen atom should have 6 dots drawn around the symbol
For Calcium atomThe calcium atom has 2 electrons in its outermost shell
Hence, the Lewis structure of a calcium atom should have 2 dots drawn around the symbol Ca
For Nitrogen atomThe nitrogen atom has 5 electrons in its outermost shell
Hence, the Lewis structure of a nitrogen atom should have 5 dots drawn around the symbol N
For Aluminum atomThe nitrogen atom has 3 electrons in its outermost shell
Hence, the Lewis structure of an aluminum atom should have 3 dots drawn around the symbol Al
For Fluorine atomThe fluorine atom has 7 electrons in its outermost shell
Hence, the Lewis structure of a fluorine atom should have 7 dots drawn around the symbol F
Hence,
The Lewis structure of an oxygen atom should have 6 dots drawn around the symbol
The Lewis structure of a calcium atom should have 2 dots drawn around the symbol Ca
The Lewis structure of a nitrogen atom should have 5 dots drawn around the symbol N
The Lewis structure of an aluminum atom should have 3 dots drawn around the symbol Al
The Lewis structure of a fluorine atom should have 7 dots drawn around the symbol F
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All of the following are evidence of a chemical change except
Change of matter
Formation of gas
Color change
Precipitate forms
Answer:
The right answer is A, "Change of matter."
Explanation:
The formation of gas, color change, and precipitate forming are the 3 main chemical changes that are evidence of a new substance being produced. A change of matter is not. Changes of state are physical changes in matter. They are reversible changes that do not involve changes in matter's chemical makeup or chemical properties.
5. A 1.1181-g sample of an alloy (a mixture) of aluminum and magnesium was treated with an
excess of sodium hydroxide solution. In the reaction, only the aluminum reacts with the sodium
hydroxide solution:
2 Al + 2 NaOH + 6 H202 Na[Al(OH)4] + 3 H2
If 0.1068 g of H2 is produced, what is the mass percent of aluminum in the alloy?
Answer : The mass percent of Al in the alloy is 85.9 %.
Explanation : Given,
Mass of sample of an alloy = 1.1181 g
Mass of [tex]H_2[/tex] = 0.1068 g
Molar mass of [tex]H_2[/tex] = 2 g/mol
Molar mass of [tex]Al[/tex] = 27 g/mol
First we have to calculate the moles of [tex]H_2[/tex].
[tex]\text{Moles of }H_2=\frac{\text{Given mass }H_2}{\text{Molar mass }H_2}[/tex]
[tex]\text{Moles of }H_2=\frac{0.1068g}{2g/mol}=0.0534mol[/tex]
Now we have to calculate the moles of [tex]Al[/tex]
The balanced chemical equation is:
[tex]2Al+2NaOH+6H_2O\rightarrow 2Na[Al(OH)_4]+3H_2[/tex]
From the reaction, we conclude that
As, 3 moles of [tex]H_2[/tex] produced from 2 moles of [tex]Al[/tex]
So, 0.0534 mole of [tex]H_2[/tex] produced from [tex]\frac{2}{3}\times 0.0534=0.0356[/tex] mole of [tex]CaCl_2[/tex]
Now we have to calculate the mass of [tex]Al[/tex]
[tex]\text{ Mass of }Al=\text{ Moles of }Al\times \text{ Molar mass of }Al[/tex]
[tex]\text{ Mass of }Al=(0.0356moles)\times (27g/mole)=0.9612g[/tex]
Now we have to calculate the mass percent of Al in the alloy.
Mass percent of Al in alloy = [tex]\frac{\text{Mass of Al}}{\text{Mass of sample of an alloy}}\times 100[/tex]
Mass percent of Al in alloy = [tex]\frac{0.9612g}{1.1181g}\times 100[/tex]
Mass percent of Al in alloy = 85.9%
Therefore, the mass percent of Al in the alloy is 85.9 %.
What is emperical formula of 62.4% C 4.19 % H 33.2% O
Answer:
[tex]C_{26}[/tex][tex]H_{21}[/tex][tex]O_{10}[/tex]
Explanation:
We are given the following percentages:
Carbon ------ 62.4%
Hydrogen ------------ 4.19%
Oxygen ---------------- 33.2%
Now, let's take a 100g sample of this compound
since percentages are calculated out of 100, you will notice that the mass of the elements in the sample is the same as their percent composition
So we have:
Carbon -------- 62.4 grams
Hydrogen ----------- 4.19 grams
Oxygen ------------ 33.2 grams
With this information, we can calculate the number of moles of the respective elements in the given compound
Moles of Carbon (mass = 12u):
Given mass / Molar mass = 62.4 / 12 = 5.2 moles
Moles of Hydrogen (mass = 1u):
Given mass / Molar mass = 4.19 / 1 = 4.2 moles (approx)
Moles of oxygen (mass = 16u):
Given mass / Molar mass = 33.2 / 16 = 2 moles
The ratio of moles of the respective elements in our compound:
(Moles of Carbon) : (Moles of Hydrogen) : (Moles of Oxygen)
5.2 : 4.2 : 2
Which can be written as: [tex]C_{5.12} H_{4.2} O_{2}[/tex]
We are almost done but there is one problem, the formulas of compounds we see have whole numbers and not decimals
So, we will multiply all 3 of the numbers by the smallest number possible to get whole number ratios
Since there are 2 numbers we need to take care of and both of them have 2 in the decimal place,
we can multiply by 5 to get whole number ratios
So we get:
26 : 21 : 10
Therefore the molecular formula of the compound:
[tex]C_{26}H_{21}O_{10}[/tex]
Match each term with its definition or description.
________ moles of solute per liter of solution
________moles of solute per kilogram of solvent
________mass of a substance per unit volume
________mass of a solute per mass of the total solution, multiplied by 100
________volume of a solute per volume of the total solution, multiplied by 100
a. molarity
b. weight percent
c. parts per billion
d. weight concentration
e. molality
f. Parts per billion
g. volume percent density
Answer:
a. molarity
e. molality
h. density
b. weight percent
g. volume percent
Explanation:
Molarity is defined as the number of moles of substance dissolved in per liter of solution (moles/Liter). It is also called molar concentration of the solution.
Molality is defined as the number of moles of substance dissolved in one kg or kilogram of solvent and its SI unit is mol/kg.
Density is defined as the mass divided by its volume.
density =mass/volume
Weight percent is defined as the division of mass of a solute to the mass of the total solution, multiplied by 100. To calculate the weight percent or mass percent, both mass of a solute and the mass of a solution is required to express the concentration of a solution.
Volume percent is defined as the ratio of the volume of the solute to the volume of the total solution multiplied by 100.
One type of atomic particle that is found in the nucleus does not contribute to
an element's atomic number. What are two characteristics of this type of
atomic particle?
A. Negative charge
B. Almost o amu
C. 1 amu
D. No charge
Answer:
In the middle of every atom is the nucleus. The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. D. No Charge
Explanation:
Answer:
C & D
Explanation:
Just took quiz and got it right! Hope this helps! <3
What is the mass of a liquid with a density of 2.12 g/mL and a volume of
53.0 mL ?
Answer:
The answer is 112.36 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of liquid = 53 mL
density = 2.12 g/mL
We have
mass = 2.12 × 53
We have the final answer as
112.36 gHope this helps you
