Which statement is true about a reversible reaction?
A. It has equal mass of all reactants.
B. It produces salts from acids and bases.
C. It has equal number of products and reactants.
D. It results in an equilibrium mixture of reactants and products.
Answer:
D. it results in an equilibrium mixture of reactants and products
Explanation:
took the test
Which foods are examples of complex carbohydrates? (Select all that apply.)
Answer:
Here all the given options are examples of complex carbohydrates.
Explanation:
As all these contains sugar, starch and fibre.
Balance the equation first.
N2 + H2 -> NH3
a) Find how many moles of NH3 are produced when 4.9 moles of N2 are completely reacted with hydrogen.
b) how many moles of H2 are required to produce 59.4 moles of NH3?
Answer:
Therefore, 12 moles of hydrogen makes 8 moles of ammonia.
Using the proportions of the amount of the molecules, we can convert from any reagent or product to any other reagent or product. In the context of this reaction, for every mole of N2 and every 3 moles of H2 we obtain 2 moles of NH3.
Explanation:
;)’ hola
How long would it take for a sound impulse to travel through an aluminum rod 1,500 meters long?
0.45 sec
4.5 sec
3.4 sec
0.29 sec
Answer:
As per Provided Information
Distance travelled by sound impulse through an aluminium rod is 1500 metres .
We have been asked to determine the time taken by the sound impulse to travel through aluminium rod .
As we know
Speed of sound in aluminium rod is 5100m/s .
Using Formulae
[tex] \boxed{\bf \: Time \: taken_{(Sound \: impulse)} = \cfrac{distance \: travelled \: by \: sound \: impulse}{speed \: of \: sound \: impluse}}[/tex]
Substituting the value and we obtain
[tex] \sf \qquad \longrightarrow \: Time \: taken_{(Sound \: impulse)} = \dfrac{1500}{5100} \\ \\ \\ \sf \qquad \longrightarrow \: Time \: taken_{(Sound \: impulse)} = \cancel\dfrac{1500}{5100} \\ \\ \\ \sf \qquad \longrightarrow \: Time \: taken_{(Sound \: impulse)} = 0.29 \: s[/tex]
Therefore ,
0.29 second sound impulse takes to travelled.So, your answer is 0.29 s .
i need help balancing the equation and number 4
Explanation:
I hope this helps answer your questions
Denatured alcohol vs isopropyl alcohol for cleaning.
Denatured alcohol and isopropyl alcohol are as similar as they as different. They are both used for cleaning and harmful to people if ingested. But isopropyl seems to be more effective than denatured alcohol. Denatured alcohol has been found to be more toxic and can harm our skin. But when it comes to cleaning, denatured alcohol can be used, but should not be used over isopropyl as it can leave behind residue, especially when it comes to electronic devices. Isopropyl, especially 70%, is more effective because it has more water, which can help it dissolve more slowly, penetrate cells, and kill bacteria.
A diverâs backup oxygen tank reads 900 mm Hg while on her boat, where the temperature is 27 degrees C. When she dives down to the bottom of an unexplored methane lake on a recently discovered moon of Neptune, the temperature will drop to -183 degrees C. What will the pressure in her backup tank be at that temperature?
Taking into account the Gay Lussac's law, the pressure in the backup tank at -183 °C is 270 mmHg.
Gay Lussac's lawGay Lussac's law establishes the relationship between the temperature and pressure of a gas when the volume is constant.
This law says that the pressure of the gas is directly proportional to its temperature: when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, gas pressure decreases.
Mathematically, Gay-Lussac's law states that the ratio between pressure and temperature has the same value:
[tex]\frac{P}{T} =k[/tex]
Studying an initial state 1 and a final state 2, it is fulfilled:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
Pressure in the backup tankIn this case, you know:
P1= 900 mmHgT1= 27 C= 300 K (being 0C= 273 K)P2= ?T2= -183 C= 90 KReplacing in the Gay-Lussac's law:
[tex]\frac{900 mH}{300 K} =\frac{P2}{90 K}[/tex]
Solving:
[tex]P2=90K\frac{900 mH}{300 K}[/tex]
P2=270 mmHg
Finally, the pressure in the backup tank at -183 °C is 270 mmHg.
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The major product of the given reaction has the molecular formula c10h16o3. Draw its structure in the most stable tautomeric form.
Tautomers are isomers composed of the same atoms but with different electronic and molecular structures. The most stable tautomeric form is attached.
What is tautomery?
Tautomery is a special case of isomery produced by the change in the position of one or more atoms in the molecule. This change in position modifies the molecular electronic distribution, and hence, the molecular structure.
In solution, isomeres called tautomers are in equilibrium, and the constant interconversion is called tautomerization. Both molecules have the same type and quantity of atoms.
In the proposed example, the product has the molecular formula C₁₀H₁₆O₃. Isomeric molecules must have 6C, 16H, and 3O. However, the distribution of these atoms varies, leading to a change in the product molecule structure.
In the attached files you will find an example. You should check if this is the same example as yours.
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Choose the correct option:
Answer:
i think your answer is d
Explanation:
sorry if it is wrong
Increasing ions in solution will decrease the pH of a solution, while increasing the. ions in solution will increase the pH of a solution. Fill the Blank
Help me!
Answer:
Increasing the H+/H3O+ will decrease the pH, while increasing the OH- ions will increase the pH
Explanation:
so pH=-log(H), which means that the smaller H gets to 0, the more the pH rises. The larger the H+ gets, the smaller the pH
if H is 1, then pH is 0
if H is 0.1, then pH is 1
if H is 0.01, then pH is 2
and so on
if H is 0.00000000000001, then the pH is 14
When OH goes up, H goes down, so
if OH is 0.00000000000001, then the ph is 0
if OH is 0.0000000000001, then the pH is 1
and so on
If the OH is 1, then the pH is 14
How many pairs of autosomal chromosomes does each person without chromosomal abnormalities have?
a)46 pairs
b)22 pairs
c)23 pairs
d)45 pairs
What is a bifurcation?
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A division into two branchesAny place where one thing divides into two.[tex]\rule{70mm}{2.2pt}[/tex][tex]\sf{\:мѕнαcкεя\: ♪...}[/tex]
What makes a light wave different from all mechanical waves?
Answer:
Light is a transverse wave.
Explanation:
Light waves are not considered mechanical waves because they don't involve the motion of matter. Most of the mathematics and properties of mechanical waves apply to light waves. Light waves are different from mechanical waves, however, because they can travel through a vacuum.
How will you use simple filter paper to demonstrate chromatography. Show with diagram.
Answer:
1. Draw a pencil line across the filter paper, 1 - 2 cm from the bottom.
2. Use a pipette or capillary tube to add small spots of each ink to the line on the paper.
3. Place the paper into a container with a suitable solvent in the bottom. For example, water. Make sure the water level is below the pencil line.
4. Allow the solvent to move through the paper, but remove the chromatogram before it reaches the top.
5. Allow the chromatogram to dry.
Extras : preferably use a lid to prevent evaporation and use a pencil or any suitable device to prop the paper in place, make sure the sides of the paper doesn't touch the sides of the beaker.
Which phrase describes a dipole moment? (1 point)
the separation of positive and negative charges
the vibration of a molecule
the imbalance of positive and negative charges
the releasing of energy from a molecule
Which statement best summarizes the presence of greenhouse gases in the atmosphere? (1 point)
The atmosphere is mostly non-greenhouse gases, so the small amount of greenhouse gases have little impact on climate
The atmosphere has recently changed and is mostly greenhouse gases, but they have little impact on climate
The atmosphere is mostly non-greenhouse gases, but the small amount of greenhouse gases have a large impact on climate
The atmosphere has recently changed and is mostly greenhouse gases, which have a large impact on climate
Which observed consequence is due to increased production of greenhouse gases? (1 point)
more glaciers
global cooling
melted ice caps
fewer floods
Are greenhouse gases and the greenhouse effect ever beneficial? Why or why not? (1 point)
No, greenhouse gases are a result of air pollution, which is detrimental to the environment.
Yes, industries need to consume greenhouse gases to help people keep their standard of living
No, too many greenhouse gases cause the planet to retain too much heat.
Yes, the greenhouse effect keeps the planet warm enough to support life.
Which molecule acts as a greenhouse gas? (1 point)
nitric oxide (NO)
oxygen (0₂)
nitrous oxide (N₂O)
nitrogen (N₂)
Answer:
1. the imbalance of positive and negative charges.
Explanation
The electric dipole moment is a measure of the separation of positive and negative electrical charges within a system, that is, a measure of the system's overall polarity.
2.The atmosphere has recently changed and is mostly greenhouse gases, which have a large impact on climate
Explanation.
They cause climate change by trapping heat, and they also contribute to respiratory disease from smog and air pollution. Extreme weather, food supply disruptions, and increased wildfires are other effects of climate change caused by greenhouse gases.
3.melted ice caps
explanation
A stronger greenhouse effect will warm the ocean and partially melt glaciers and ice sheets, increasing sea level. Ocean water also will expand if it warms overexcessively.
4.Yes, the greenhouse effect keeps the planet warm enough to support life.
Explanation
The greenhouse effect is a good thing. It warms the planet to its comfortable average of 59 degrees Fahrenheit (15 degrees Celsius) and keeps life on earth, well, livable. Without it the world would be a frozen, uninhabitable place, more like Mars.
5.nitrous oxide.
Explanation
There are several different types of greenhouse gases. The major ones are carbon dioxide, water vapor, methane, and nitrous oxide. These gas molecules all are made of three or more atoms. The atoms are held together loosely enough that they vibrate when they absorb heat.
The phrase which describes a dipole moment is the separation of positive and negative charges,the statement best summarizes the presence of greenhouse gases in the atmosphere , the atmosphere is mostly non-greenhouse gases, but the small amount of greenhouse gases in an ecosystem have a large impact on climate.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .The more glaciers is the consequence is due to increased production of greenhouse gases.The greenhouse effect keeps the planet warm enough to support life. Nitrous oxide molecule acts as a greenhouse gas.
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Calculate the concentration of solution containing :
a. 0.2 mole of sodium hydroxide, NaOH, dissolved in water and made up to 100 cm3.
b. 9.8 grams od sulfuric acid, HF, dissolved in water and made up to 500 cm3.
Answer:
the answer for a is 2mol/dm3
Explanation:
n=0.2mol of NaOH
v=100cm3
[tex]v = \frac{100}{1000} \\ v = 0.1 {dm}^{3} \\ concentration = \frac{n}{v} \\ = \frac{0.2}{0.1} \\ = 2mol {dm}^{3} [/tex]
2. Describe one way in which each of the items you listed in Part 1 could be at
least temporarily disrupted from equilibrium. Can you think of a way your body
could respond to restore homeostasis after one of these disruptions? (3 points)
An example of a temporary disruption from equilibrium is a temperature change, this would be compensated through sweating.
What is equilibrium?This refers to a constant state in which forces are balanced. Inside the body, equilibrium means certain conditions such as the level of oxygen or the temperature are constant.
How is equilibrium lost?This can be lost due to many factors, in the body, this occurs as a result of sudden changes either inside or outside the body. An example of this is sudden temperature changes, for example, if you go out of your house and it is snowing or it is very hot outside.
How is homeostasis or equilibrium restored?The body has specific mechanisms to restore the temperature. For example, if the environmental temperature is too high the body uses sweating to keep a constant temperature.
Note: This question is incomplete because the list of part 1 is not given; due to this, the answer is based on general knowledge.
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Answer: describe in general a process desert plants might need to carry out in order to maintain homeostasis
Explanation:
Explain in complete sentences why
how the oceans are fundamental to all life on Earth
Answer:
The oceans are the very foundation of human life. life itself arose from the oceans. The oceans are vast, covering about 140 million square miles, some covering 72 percent of the earth's surface.
Explanation:
What is the pressure in a 8.00 L tank with 50.5 grams of chlorine gas at 365 K?
The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.
What is pressure?Pressure can be defined as the force acting prpendicular per unit surface.
To calculate the pressure of chlorine gas, we use the formula below.
Formula:
PV = nRT.................. Equation 1Where:
P = PressureV = Volumen = number of moles of chlorine gasR = Molar gas constantT = TemperatureMake P the subject of the equation
P = nRT/V............ Equation 1From the question,
Given:
T = 365 KR = 0.0821 L.atm.K⁻¹.mol⁻¹V = 8 Ln = 50.5/(35.5×2) = 0.711 molesSubstitute these values into equation 2
P = (0.0821×365×0.711)/8P = 2.66 atmHence, The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.
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A pure sample of a monoprotic acid is dissolved in water. the sample is titrated with sodium hydroxide solution. at the point where 20.0 ml of the naoh solution has been added, the ph is 4.15. the phenolphthalein endpoint of the titration is observed when 50.0 ml of naoh have been added. what is the pka of the acid
Answer:
21 22 23 24 25 26 27 28 29 30
Explanation:
Predict the sign of delta H for water condensing. Is this reaction spontaneous?
A) + and spontaneous
B) - and uncertain
C) + and uncertain
D) - and spontaneous
Answer:
A + and spontqneous
Explanation:
i hope this helps.
The enthalpy change of condensation of water is negative and here the entropy change also negative and the process is nonspontaneous.
What is enthalpy change?The enthalpy change of a reaction or a phase change is the change in heat energy absorbed or evolved. The change in enthalpy is dependant on the nature of process as well on temperature of the system.
Condensation of water is the change of its liquid state into solid state. Thus water freezes to form ice. In this process, the system is getting more ordered structure in the solid state and thus, the entropy of the system decreases means the entropy change is negative.
Now, when converting liquid to solid heat is released by the system. Hence, enthalpy change, delta H is negative. A process becomes spontaneous only f its Gibbs energy is negative.
Here we have both negative entropy and enthalpy so make Gibbs energy negative higher temperature is needed.
Condensation of a substances is taking place at very low temperature and thus gibbs energy become positive. Therefore the process is nonspontaneous.
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At the wavelengths included in Study 1, as the
wavelength of light increases, the reflectance of
Cyanide:
A.
increases only.
B.
decreases only.
C.
increases, then decreases.
D.
decreases, then increases.
Based on the research in Study 1, as the wavelength of light increases, the reflectance of Cyanide: C. increases, then decreases.
What is wavelength?Wavelength is simply defined as the distance (in meters) between two (2) successive crests or troughs of a wave. Thus, wavelength refers to the horizontal distance between two adjacent crests or troughs of a wave.
Generally, there is a linear relationship between the wavelength of light and reflectance. Thus, as the wavelength of light increases, the reflectance of Cyanide in Study 1 increases, before it then decreases.
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Which of the following occurs when sodium and chlorine bond together to form sodium
A chlorine atom gains an electron from a sodium atom
A chlorine atom gains a proton from a sodium atom.
A chlorine atom donates a proton to a sodium atom.
A chlorine atom donates an electron to a sodium atom.
HELP FAST!! BRAINLIEST!
Boron-10 is commonly used as a control rod for nuclear reactors because it absorbs _______ and releases an alpha particle and a lithium-7 nuclide.
A. a neutron
b. a gamma ray
c. an electron
d. a protron
Your answer is A. a neutron
A rod, plate, or tube containing a material such as hafnium, boron, etc., used to control the power of a nuclear reactor. By absorbing neutrons, a control rod prevents the neutrons from causing further fissions.
Answer:
A. a neutron
Explanation:
Boron-10 is commonly used as a neutron absorber due to the high neutron cross section of isotope 10B.
hope this helps!
2H2O --> 2H2 + O2 If you begin with 20 grams of H2O, how many moles of O2 are produced?
Answer:
17.78 gm
Explanation:
2 H20 mole weight = 36 gm
which leads to 32 gm O2
36 / 32 = 20 / x x = 17.78 gm
during lanslides rock and soil are?
Answer:
Getting carried down a moutain side or a cliff and they are relocated.
Explanation:
Glaciers are responsible for moving rocks from one place to another
Imagine that you are a leaf on a plant, and you realize that you are running low on supplies to do your job. You decide to text the roots to set up a delivery. Write a text message conversation between the leaf and the roots that discusses and arranges this delivery.
Be sure to answer these questions in your conversation:
• Which supplies is the leaf running out of? • What are the supplies needed to do? • How will the roots get the supplies from outside the plant? • How will the supplies get from the roots to the leaf?
The leaves of plants primarily serve to photosynthesize and require water conducted by the root to do so.
Water conduction by the rootAs a leaf of a plant running low on supplies that the root is responsible for, what I will be needing is water.
Thus, I will have to send a text message to the root to supply me with water. The root will respond by asking its foot soldiers (the root hairs) to conduct water into the root.
Once water gets into the root, it enters special cells that are responsible for conducting water inside plants - the xylems. The root sends the water through the xylem and water travels from there to me - the leaf.
Once the water gets to me, I will use it in combination with inorganic carbon (carbon dioxide) to synthesize carbohydrates.
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."A ternary covalent compound consists of 3 types of nonmetallic elements in its chemical formula." Which is NOT an example of a ternary covalent compound ? A. Ozone (03)
B. Sucrose (C12H22011)
C. Carbonic acid (H2C03)
D. Ammonium sulfide (NH4)2s
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If the colored spheres represent different solute particles, based on the principles of osmosis, in which overall direction is water (not pictured) most likely to move?
A.
Water will move into the cell.
B.
Water will not move into or out of the cell.
C.
Water will move into and out of the cell equally.
D.
Water will move out of the cell.
Water will move into the cell because of lower concentration of water inside the cell as compared to outside.
Why water moves inside or outside of the cell?Water has a tendency to move across a membrane from a lower osmolarity to a higher osmolarity which means from higher concentration region to the lower concentrated region.
So we can conclude that water will move into the cell due to lower concentration of water inside the cell as compared to outside.
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Answer:
If you're from study island, the answer is D. Water will move out of the cell.
Explanation:
I got it on study island and this was right.
How are fluids used and controlled in manufactured devices?
Answer:
Fluid power systems perform work by a pressurized fluid bearing directly on a piston in a cylinder or in a fluid motor. A fluid cylinder produces a force resulting in linear motion, whereas a fluid motor produces torque resulting in rotary motion. Within a fluid power system, cylinders and motors (also called actuators) do the desired work. Control components such as valves regulate the system.
