Answer:
A pure substance is a substance or an element whose impurities are extracted by concentration by chemical means.
e.g Aluminium is made pure by concentration of it's ore, bauxite by treatment with excess Sodium Hydroxide solution.
How many moles are in 1.4 x 10^21 atoms of sodium?
Answer:
devide by avogadro constant 6.02*10^23
Explanation:
By what factor does the average kinetic energy of the molecules of gas in an aerosol container increase when the temperature is raised from 300 K to 900 Κ?
Answer:
The average kinetic energy is increased by a factor of 3.
Explanation:
The average kinetic energy is given by:
[tex] \overline{E} = \frac{3}{2}kT [/tex]
Where:
k: is the Boltzmann constant
T: is the temperature
When the temperature is 300 K we have:
[tex] \overline{E_{1}} = \frac{3}{2}300k [/tex]
Now, when the temperature is 900 K:
[tex] \overline{E_{2}} = \frac{3}{2}900k = 3(\frac{3}{2}300k) = 3\overline{E_{1}} [/tex]
Therefore, when the temperature is raised from 300 K to 900 Κ, the average kinetic energy is increased by a factor of 3.
I hope it helps you!
1. Friction acts in a direction
to the
direction of an object's motion.
a. unrelated
b. opposite
c. equal
d. perpendicular
Friction acts in the opposite direction to the direction of an object's motion. Therefore, option (b) is correct.
What is Friction?Friction can be defined as the resistance provided by the surfaces that are in contact when they pass over each other. Friction offers the traction that is required to walk without slipping.
Friction can be described as a force that is dependent on external factors. Friction depends upon the nature of the two surfaces that are in contact and on the smoothness or roughness of the two contacted surfaces. When one body moves over the surface of another, these irregularities on the surface of the bodies get entangled and develop friction.
Friction depends upon the force that is exerted on these surfaces and increases when the force is applied along with the irregularities. Types of Friction are Rolling friction, Static friction, Sliding friction, and Fluid friction.
The force of friction acts in the opposite direction to the direction of an object's motion.
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The heat absorbed or released of a reaction at a constant presser is the same as the change in enthalpy
Answer:
HAT IS THE QUESTIN? hehehe
Explanation:
lol
What color is phenolphthalein in a solution that has a pH of 10?
Science and there is a picture
Answer:
c solid metal
Explanation:
it's made of iron and nickel
Answer:
D) solid metal
Explanation:
Unlike the mineral-rich crust and mantle, the core is made almost entirely of metal—specifically, iron and nickel. The shorthand used for the core's iron-nickel alloys is simply the elements' chemical symbols—NiFe. Elements that dissolve in iron, called siderophiles, are also found in the core.
The inner core is solid because it is made of very dense, or heavy, materials - like iron and nickel. Even though it is very hot, these materials don't "melt" very easily, so they stay solid.
What is the density of a block of wood with a volume of 16.5 ml and mass of 6.39g?
Answer:
0.38
Explanation:
The formula for finding density is mass/volume. So the equation becomes 6.39/16.5 which gives you 0.38
if a solution has a pOH of 5.2 the pH of the solution is
Answer: The pH of the solution is 8.8
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.pOH is calculated by taking negative logarithm of hydroxide ion concentration
[tex]pH=-\log [H^+][/tex]
[tex]pOH=-log[OH^-][/tex]
pH+pOH=14
Putting in the values:
[tex]pH+5.2=14[/tex]
[tex]pH=8.8[/tex]
Thus pH of the solution is 8.8
_AgNo3(aq) + _Na2Co3(aq) =
1. Predict the products of the reaction including the states of matter for each product.
2. Balance the equation.
Please help me.
Answer:
2AgNO3 (aq) + Na2CO3 (aq) = Ag2•CO3 (s) + 2NaNO3 (aq)
Explanation:
1) The reaction given is a precipitation reaction between Silver nitrate and Sodium carbonate to give products as Ag_2_CO3 (s) and NaNO3 (aq)
Which are solid Silver carbonate and aqueous solution of Sodium nitrate.
2) The balanced equation is;
2AgNO3 (aq) + Na2CO3 (aq) = Ag2•CO3 (s) + 2NaNO3 (aq)
When a computer or end-user uses a made-up IP address as a source address is called?
Answer:
That would be a VPN.
Explanation:
Answer:
Would be a dependant, and the IP address is the host address
Many metals react with acids to produce hydrogen gas. A certain reaction produces 32.6 L of hydrogen gas at STP. How many moles of hydrogen were produced? *
22.4 mol
1.46 mol
730 mol
16.3 mol
Answer:
1.46 mol of H₂
Explanation:
This easy question can be solved by a rule of three.
At STP conditions, we know that 1 mol of any gas is contained in 22.4L.
So let's make the operation:
22.4L is the volume for 1 mol of any gas, at STP
32.6 L may be the volume for (32.6 . 1) /22.4 = 1.46 moles.
We can also apply, the Ideal Gases Law.
At STP conditions, Temperature is 273.15 K and pressure is 1 atm
P . V = n . R . T
n = (P . V) / R. T → (1 atm . 32.6L) / (0.082 . 273.15K)
n = 1.455 mol
Nuclear Equations HELP!!! 100PTS
A nuclear equation is one, where the sum of the mass numbers and the sum of the atomic numbers balance on either side of an equation. Nuclear equation problems will often be given such that one particle is missing.
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The pressure for a tire is 123 KPa. Calculate the pressure in atmospheres (atm)?
Answer:
0.974 atm; 740 mm Hg; 98.7 kPa; 0.987 bar
What pressure, in atm, would be exerted by 0.023 grams of oxygen (O2) if it occupies 31.6 mL at 91
°C?
Answer: A pressure of 0.681 atm would be exerted by 0.023 grams of oxygen [tex](O_2)[/tex] if it occupies 31.6 mL at [tex]91^{o}C[/tex].
Explanation:
Given : Mass of oxygen = 0.023 g
Volume = 31.6 mL
Convert mL into L as follows.
[tex]1 mL = 0.001 L\\31.6 mL = 31.6 mL \times \frac{0.001 L}{1 mL}\\= 0.0316 L[/tex]
Temperature = [tex]91^{o}C = (91 + 273) K = 364 K[/tex]
As molar mass of [tex]O_2[/tex] is 32 g/mol. Hence, the number of moles of [tex]O_2[/tex] are calculated as follows.
[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{0.023 g}{32 g/mol}\\= 0.00072 mol[/tex]
Using the ideal gas equation calculate the pressure exerted by given gas as follows.
PV = nRT
where,
P = pressure
V = volume
n = number of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the value into above formula as follows.
[tex]PV = nRT\\P \times 0.0316 L = 0.00072 mol \times 0.0821 L atm/mol K \times 364 K\\P = \frac{0.00072 mol \times 0.0821 L atm/mol K \times 364 K}{0.0316 L}\\= 0.681 atm[/tex]
Thus, we can conclude that a pressure of 0.681 atm would be exerted by 0.023 grams of oxygen [tex](O_2)[/tex] if it occupies 31.6 mL at [tex]91^{o}C[/tex].
Jennifer has a jar full of stones. For one year, Jennifer shakes the jar several times each day. The illustration below shows the changes that occurred after one year. What process does this illustration show?
Jennifer has a jar full of stones. For one year, Jennifer shakes the jar several times each day. The illustration below shows the changes that occurred after one year, and this shows that because of the fragmentation, this happens.
Initially, before a year, there were many rocks, but as she continuously shrank the box, that led to the fragmentation. Due to vibration for a long time, the larger rocks break into the smaller particles as a result of the amount of rocks converted into the small particles and sands. These smaller stone fragments may then accumulate at the bottom of the jar as a result of this there is a decrease in the overall number of stones in the jar.
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How many grams of H2O is created from 60 grams of O2?
[2 H2 + O2 —> 2 H2O]
Answer:
67.5 gm H2O
Explanation:
2 H2 = 4 gm
O2 = 32 gm
2 H20 = 36 gm
so 32 gm O2 results in 36 gm H20
32/36 = 60/x x = 67.5 gm
When sewing, push the needle with a force of 10 N. its spike area is equal to 0.0001 mm2. what is the pressure of the needle in the tissue
Answer:
1×10^5
Explanation:
Pressure = Force/Area
P= 10/0.0001
P= 10000
P=1×10^5
. A green colour substance 'X' is heated strongly. Its colour changes to 'Y' and smell of burning sulphur is given out.
a. Name the substances X and Y.
b. Name the type of reaction taking place.
c. Write the balanced chemical equation for the reaction.
Answer:
_________(question)__________
. A green colour substance 'X' is heated strongly. Its colour changes to 'Y' and smell of burning sulphur is given out.
Explanation:
___(answer)___
a.
_______________
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What causes the buoyant force on an object submerged in water?
Answer:
Upthrust.
An upthrust is that outward protruding force that acts opposite to the weight of the object
- A closed container has a volume of 10 ml and a pressure inside of 20 P. If the
container is shrunk to 3 ml, what is the new pressure?
Answer: The new pressure is 66.66 mL.
Explanation:
Given : [tex]V_{1}[/tex] = 10 mL, [tex]V_{2}[/tex] = 3 mL
[tex]P_{1}[/tex] = 20 atm, [tex]P_{2} = ?[/tex]
Formula used to calculate the new pressure is as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}[/tex]
Substitute the given values into above formula as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}\\20 atm \times 10 mL = P_{2} \times 3 mL\\P_{2} = \frac{20 atm \times 10 mL}{3 mL}\\= 66.66 mL[/tex]
Thus, we can conclude that the new pressure is 66.66 mL.
At 40 degrees Celsius , 100 grams of NaClO3 is added to 100 grams of water. The solution would be ..
a.) saturated
b.)unsaturated
c.) saturated with excess
d.) supersaturated.
2. How does an atom of aluminum become an ion?
1. It gains 3 electrons
2. It loses 3 electrons
3. It gains 3 protons
4. It loses 3 neutrons
Answer:
it loses 3 electrons
Explanation:
Tell me if I’m right
Can anyone list me all the 8 groups of the periodic table , going in order of course?
Answer:
alkali metals
alkali earth metals
transition metals
non metals
noble gases
halogens
rare earth metals
Explanation:
Calculate the mass of 3.57 mol of magnesium nitrate, Mg(NO3)2.
Answer:
529.50g
Explanation:
Molar mass find by looking at the periodic table and add all the molar mass of the chemicals together
Mg=24.30g
N=14.01g
O=16.00g
Mg(NO3)2=24.30+(14.01+16.00x3)x2=148.32g/mol
148.32x3.57=529.50g
Multiple Choice
1. Think About the definition of remote sensing. Which of the following could be considered sensors?
2. When satellite images are analyzed a unit called the pixel is a key to calculating what?
3. One Pixel represents.
a temperature
a wind speed of 10 kilometers per hour
a land area of 30 by 30 meters
various colors depending on their size
Answer:
Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance (typically from satellite or aircraft). ... Cameras on satellites can be used to make images of temperature changes in the oceans.
2.The answer is Land Area. If you know the distance and scale at which the image was captured, than one pixel of the image is equal to an X amount of area. The land area is represented as one pixel in an image called Resolution.
3.A pixel is the smallest picture element addressable on a picture, it is a specific location, and at that location associated with that location, is color, intensity
a.mph (miles per hour), mph. knots, knots. m/s (meters per second), m/s. ft/s (feet per second), ft/s. km/h (kilometers per hour), km/h ...
Explanation:
7 kph 4.35 mph
8 kph 4.97 mph
9 kph 5.59 mph
10 kph
The apparatus or tools that could be considered as sensors are telecopes, probes and landsat satellites.
What is remote sensing?Remote sensing can be defined as a process that is used for the acquisition of information about a phenomenon or physical object on a planet without coming in close contact with it, especially through the use of a telecope, probe or landsat satellite.
When satellite images are analyzed by astronomers or scientists, a unit called the pixel is a key to calculating land area. Also, one pixel is a unit that represents a land area of 30 by 30 meters.
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name this compound
please helppp thank you!!!
Answer:
Sodium sulfide is the chemical compound with the formula Na 2 S, or more commonly its hydrate Na 2 S·9H 2 O. Both are colorless water-soluble salts that give strongly alkaline solutions. When exposed to moist air, Na 2 S and its hydrates emit hydrogen sulfide , which smells like rotten eggs.
I'm not sure if it's right but it's a guess because of the 2Na.
That is sodium carbonate, Na₂CO₃.
In a separate location, take notes from the sources you’ve identified. The notes will provide details for your paper. While taking notes, you may want to use these reading strategies. Use these sources if you find them helpful: Using your notes, compare the features of analog and digital signals in the table provided. Include one to three points for each feature and type of signal.
Answer:
Here is every answer for analog and digital (in order)
Analog:
Signal Shape: Smooth and continuousNumerical Values for Signal Measurements: Analog signals represent one continuous variable as the result of another continuous time-based variable. They are capable of outputting continuous information with a theoretically infinite number of possible values.Amount of Data that can be transmitted: analog circuits can conduct only fairly low-speed data communications. The maximum data rate over an analog facility is 33.6K bps when there are analog loops at either end. With 56K bps modems, only one end of the loop can be analog. The other end of the connection has to be digital. Energy requirements: light, sound, temperature, position, and pressurePrivacy and security (ability of the signal to be encoded in a secret code): not encryptedClarity of Signal: noise affects clarity and quality, noise is amplified, amplified noise causes more random information in the signal, signal bandwidth is lowDigital (in order):
Signal shape: stepping, square, and discreteNumerical Values for Signal Measurements: digital communication methods transmit a complete measured value, in other words both a numeric value and a unit of measurement Amount of data that can be transmitted: First of all, it is theoretically possible to transmit digital signals directly. Unfortunately when we use capacitors and inductors (energy storage devices) to match the impedance from the transmitter to the air (low impedance transistor say 5 ohms to 388 ohms (air)) these components introduce a bandwidth limiting match. Since all impulse functions have infinite bandwidth (transmitting a 1 and a zero) the bandwidth of the transceiver must be multi octave in order to have any reasonable efficiency. Systems engineers simplify the problem by introducing direct sequence modulation where a carrier is modulated 0/180 degrees dependent on the data rate.Energy requirements: voltage, accoustic pressure, and magnetization of a magnetic storage mediaPrivacy and security: encryptedClarity of signal: noise is lower in amplitude, electronics can ignore the noise, quality of signal is maintained, signal is highExplanation:
I did mine in bullet points, hopefully this helped!
Analog:
Signal Shape: Smooth and continuous
Numerical Values for Signal Estimations: Analog signals speak to one ceaseless variable as the result of another ceaseless time-based variable.
Amount of Information that can be transmitted: analog circuits can conduct as it were reasonably low-speed information communications.
Energy necessities: light, sound, temperature, position, and pressure Privacy and security : not encrypted
Clarity of Signal: clamor influences clarity and quality, commotion is amplified,
Digital:
Signal shape: stepping, square, and discrete
Numerical Values for Signal Measurements: digital communication methods transmit a complete measured value, in other words both a numeric value and a unit of measurement
Amount of data that can be transmitted: First of all, it is theoretically possible to transmit digital signals directly.
Energy requirements: voltage, accoustic pressure.
Privacy and security: encrypted
Clarity of signal: noise is lower in amplitude, electronics can ignore the noise, quality of signal is maintained, signal is high
Analog and digital is :Analog signal could be a continuous signal which speaks to physical estimations.
Digital signals are discrete time signals created by computerized balance.
Example :Human voice in discuss, analog electronic gadgets. Computers, CDs, DVDs, and other advanced electronic gadgets.
What is the area of ∆XYZ?
Answer:
is there an attachment to this question? i can help if u insert one :)
Explanation:
(●'◡'●)
The roots of plants are important to photosynthesis because they...
O A
remove glucose from the plant.
ОВ.
remove oxygen from the plant.
OC. provide the water needed.
D. provide the carbon dioxide needed.
Answer:
[tex]\boxed {\boxed {\sf C. \ Provide \ the \ water \ needed}}[/tex]
Explanation:
Photosynthesis is an extremely important process for plants, algae, and some bacteria. It helps create their "food", which is glucose. It is turned into energy so the organism can grow, repair damages, and carry out other processes.
The equation for photosynthesis is as follows:
[tex]H_2O+CO_2+energy \rightarrow C_6H_{12}O_6 + O_2[/tex]
Water, carbon dioxide, and light energy from the sun are converted to glucose and oxygen.
Roots are important for obtaining water. Since they reach into the soil, they can absorb the water. Then, capillary action draws the water up the stem into the xylem and then into the leaves, where photosynthesis occurs.
list 3 ways to increase the solubility of a liquid
Answer:
Three ways I can come up with are increasing the temperature, increased the amount of solvent, and using a solvent with similar polarity as the solute.
Explanation: