Answer:
The answer is provides an impenetrable outer covering that cannot be penetrated by most pathogens :)
Explanation:
The cells line the skin so then it makes it really difficult for germs to get through. :)
Have an amazing day!!
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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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!
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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what are the products for the following equation?
NaCl + H2O ->
Answer:
NaOH + HCI
Explanation:
yesssssssssssss
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.
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:
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]
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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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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which phrase explains the apparent motions of planets in the night sky?
The east to west daily motions of stars, planets, the Moon, and the Sun are caused by the rotation of the Earth on its axis. The Earth and all the planets revolve around the Sun on circular orbits. This produces the change in constellations observed from one time of year to the next.
hope it helps..!!!
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 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.
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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Why do chemist prefer to use kipp’s apparatus for the production of hydrogen sulphide instead of woulf’s bottle??
Chemist prefer to use kipp’s apparatus for the production of hydrogen sulphide instead of woulf’s bottle because they produce gas without generating heat.
What is kipp's appratus & woulf's bottle?Kipp's appratus and woulf's bottle both are the laborartory appratus and used in the analytical process of any reactions.
Hydrogen sulphide gas will be produced in the laborartory by using both given appratus but we prefer the use of kipp's apparatus because in this apparatus small amount of gas is produced in the controlled heat condition by the reaction between the liquid sulphuric acid and solid iron sulphide.
Hence we prefer kipp's appratus as it produces gas without heat.
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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
Which term describes the molecule shown below?
H H
C=C
H
H
O A. Saturated alkene
O B. Unsaturated alkane
O C. Unsaturated alkene
O D. Saturated alkane
Answer:
The answer is C
Explanation:
unsaturated hydrocarbons have multiple carbon bonds
Unsaturated alkene describes the molecule shown below as the atoms are attached by double bonds.
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is solid,liquid , gas consists of atoms . Each atom has a nucleus which is contains protons and neutrons and shells in which the electrons revolve.
The protons are positively charged particles and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged particles and hence the atom as a whole is neutral particle and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not change the chemical properties of the substances.
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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.
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
I will mark brainlist
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.
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:
c) Which one of the following compounds will react with perrhenic acid? Tick one box.
ethane
hydrochloric acid
potassium carbonate
sodium chloride
Answer:
I believe is the correct answer
Explanation:
hydrochloric
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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Equation for the hydrolysis of glyceryl triethanoate.
The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH
What is Hydrolysis?Hydrolysis is a chemical reaction which water molecule break down one or more chemical bonds. This is use for substitution, elimination, and solubility.
Hydrolysis depend on the pH, solubility and chemical constituent of the substance.
Therefore, The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH
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NO LINKS PLEASE! Why does dye dropped into a cup of water eventually spread throughout the water?
A. The water has lattice vectors.
B. The water undergoes a phase transition.
C. The water particles and dye particles exhibit Brownian motion.
D. The water exerts pressure on the container.
Answer:
C
Explanation:
okay, you need to look at the structures of the particles of matter in the solid, liquid and gas.
particles in a solid are in fixed positions, where they can only vibrate in those positions ( take a look at ice, or rather, a brick)liquids have very small or rather, no spaces between them, but they can slide or rub against each other, like people in a really tight crowd I guessgas particles have very large spaces between them and they move randomly. these exibit what's called brownian motion.since water particles (and all other liquid particles) have negligible spacings and limited movement, that allows the dye particles to move from a region of high concentration to that of a low concentration. the aim for this is for the mixture/solution to reach an equilibrium, that is the mixture must get to a point where all regions have the same concentration of the dye.you can refer to your coursebooks :)
correct where wrong please:)
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
Choose the correct option:
Answer:
i think your answer is d
Explanation:
sorry if it is wrong
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
Giving brainiest and 55 points!
Answer:
C
Explanation:
Hot and humid weather, accompanied by thunderstorms, is generally due to maritime tropical air massoriginate in the tropical oceans of both the hemispherescharacterized by high temperatures and are rich in moisture contentair mass during winter moves towards the land areas in the form of wind breeze affecting placesexperiences hot and humid weather during the summer seasonWhat 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.
