Answer:
581 Joules.
Explanation:
Using the formula;
Q = m × c × ∆T
Where;
Q = amount of heat absorbed (J)
m = mass of substance (g)
c = specific heat capacity (J/g°C)
∆T = change in temperature (°C)
According to the information provided in this question;
Q = ?
mass of ice = 15.9g
initial temperature = -4°C
final temperature = 14°C
Hence, ∆T = 14 - (-4) = 14 + 4 = 18°C
specific heat capacity (c) of ice in J/g°C = 2.03 J/g°C
Using Q = m × c × ∆T
Q = 15.9 × 2.03 × 18
Q = 32 × 18
Q = 581 Joules.
Why can water birds drown if they still have detergent on their feathers?
write 2 typical properties that are only common to transition metals
Answer:
Properties of transition elements
they are all metals and that most of them are hard, strong, and lustrous, have high melting and boiling points, and are good conductors of heat and electricity.
are you chemistry because you just blew up my heart
Answer:
i needed that lol
thank you
Explanation:
Compare and contrast a driver of a car and truck, and list defensive driving no links
Answer:
These defensive driving skills can help you avoid the dangers caused by other ... being aware of the cars around you, checking your mirrors — the list goes on. ... It's not just teen drivers who are at fault: People who have been driving for a while ... car and a slow-moving truck in the same lane, it's a pretty sure bet the driver ...
Explanation:
Water cannot dissolve all substances that are made from ionic bonds. This is probably because
A.
Water needs to be stirred to dissolve all ionic substances
B.
Some ionic bonds are too strong for the attractions of water molecules to pull them apart
C.
Some water molecules are not as strong as others
Water cannot dissolve all substances that are made from ionic bonds probably because some ionic bonds are too strong for the attractions of water molecules to pull them apart.
WATER AS A UNIVERSAL SOLVENT:Water is a unique molecule often referred to as a universal solvent because it can dissolve almost all solutes. Water is capable of dissolving polar substances i.e. substances that have an unequal distribution of positive and negative ions.However, some ionic bonds formed from ions of elements are unable to be dissolved by water and this is probably attributed to the fact that those bonds are too strong to be pulled apart by water molecules.
Learn more about at ionic compounds at: https://brainly.com/question/9167977
answer truthfully:))
Answer:
b) velocity.
c) velocity, m/s²
d)change in velocity, change in direction, change in both velocity and direction.
e) increasing or decreasing
Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)
Starting with with 50.0 grams of Pb(NO3)2 and 30.0 grams of NaI:
A. What is the limiting reagent?
B. How many grams of the excess reactant remains?
C. How many grams of each product is formed?
D. If 12 grams of NaNO3 actually formed in the reaction, what is the percent yield of this reaction?
Answer:
Explanation:
Moles of Pb(NO3)2 = mass/molecular mass
= 50.0 grams/(207.20*1 + 14.01*2 + 16*6)
= 50.0 grams/331.22
= 0.15 moles
Moles of NaI
= 30/(22.99+126.9)
= 30/149.89
= 0.2 Moles
A. NaI is less 2x Pb(NO3)2 so NaI is the limiting reagent.
B. The ratio is 1 to 2 so there is 0.15 - 0.2/2 = 0.05 mole
or 16.78 grams of Pb(NO3)2 left.
C. As NaI is limiting, only 0.2 Moles of NaNO3 is formed.
Mass = Moles * Molecular Mass
Molecular Mass of NaNO3 can be calculated as:
Na - 22.99
N - 14.01
O - 3(16) = 48
23+14+48 = 85gram / mole
Thus, Mass = 0.2*85 = 17 gram of NaNO3
Mass is conserved in a chemical reaction.
Mass of PbI2 can be calculated as:
50+30-16.78-17
= 46.3 gram of PbI2
Mass =
12.75
Thus, 12.75g of Sodium Nitrate can be formed
Answer:
Explanation:
Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)
MM for each compound -
Pb(NO3): 207 + 14x2 + 16x3x2 = 331
PI2: 207 + 127x2 = 461
NaI: 23 + 127 = 150
NaNO3: 23 + 14 + 16x3 = 85
Moles of Pb(NO3)2 = 50/331 = 0.15
Moles of NaI = 30/150 = 0.2
Ratio of moles is 1:2
So NaI is limiting
Limited to 0.2/2 = 0.1 mole of Pb(NO3)2
Excess = 0.15 - 0.1 = 0.05 mole
Mass remains = 0.05x331 = 16.55 grams
Moles of NaNO3 formed = Moles of NaI reacted = 0.2
Mass = 0.2x85 = 17 grams
Moles of PbI2 formed = Moles of Pb(NO3)2 reacted = 0.1
Mass = 0.1x461 = 46.1 grams
If 12 grams of NaNO3 actually formed in the reaction,
percent yield = 12/17x100% = 70.6%
A scientist is adding oxygen to iron in a chemical reaction to create rust. At what point during
this reaction will the oxygen and iron quit making rust?
Answer: What type of chemical reaction is rusting of iron?
Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons.
Name the Following Binary Ionic Compounds:
a. AgCl
b. ZnO
c. CaBr2
d. SrF2
Explanation:
a.Silver chloride
b.zinc Oxide
c.calcium Bromide
d.strontium difluoride
Which compound is produced by a neutralization?
H2O(l)
HNO3(aq)
H3PO4(aq)
Ca(OH)2(s)
Explanation:
HNO3(aq) is the compound produced by a neutralization
I have a question for us gals, is it hard for all of you when you try to get your crushes attention and he/she just keeps ignoring you to the point where you could just give up?
Answer:
Yes it is hard. For some of us. I already gave up, but now hes coming back. Id say sometimes its useless to get his attention if he never even pays attention to you anyways. It sucks because its so hard to get then to notice you for once.
Explanation:
(b)
Magnesium sulphate can be made from magnesium and dilute sulphuric acid.
This is the equation for the reaction.
Mg
+
H2SO4
MgSO4
+
H2
Calculate the mass of magnesium sulphate that would be obtained from 4g of
magnesium
(Show your working.)
Answer:
Reaction
Mg+H2SO4 ----》MgSO4+H2
so calculate the moles of magnesium first
moles of magnesium = given mass of mg/molar mass of magnesium
moles = 4/24.30
moles = 0.1646
One mole of magnesium produces one mole of magnesium sulphate
so 0.1646 moles of mg will produce 0.1646 moles of MgSO4
Mass of MgSO4 = 0.1646× 120.366
MgSO4 = 19.81 gm
conclusion the mass of magnesium sulphate that would be obtained from 4g of
magnesium is 19.81 gm!!
I d k it's right or wrong but i tried :)
HELPPPP FASTTT! 4. Which is more electronegative?
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Explain Your Answer Choice
Answer:
D.lodine
Explanation:
Lodine is a nonsteroidal anti-inflammatory drug . It works by reducing hormones that cause inflammation and pain in the body. Lodine is used to treat mild to moderate pain, osteoarthritis, or rheumatoid arthritis.
I hope it's helpful for you......
what electrolyte is used in a lead storage battery?
A. hydrochloric acid
B. sulfuric acid
C. lead acetate
D. lead nitrate
Answer:
Hi ,
Answer :
Sulfuric acid
Which person do you agree with the most?
A Casey: The human population had been fairly constant throughout
Earth's history.
Allayna: Population size is increasing at a significant rate due to
advances in technology, medicine, and sanitation.
© Karl: Population size has been decreasing over time because people
are having fewer children.
Which of the following diatomic gases has the shortest bond between its two atoms?
A. HI
B. O2
C. CI2
D. N2
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
Which two compounds of oxygen are small molecules?
Explain why metals conduct electricity. Refer to structure and bonding in your answer
Answer:
They are electrical conductors because their delocalised electrons carry electrical charge through the metal.
Explanation:
for the second ques
not sure...
Write and balance the following reaction: Hydrogen gas reacts with oxygen gas to form water.
Answer:
[tex]2H_2 + O_2 -> 2 H_2 O[/tex]
HELP ASAP 20 OR MORE POINTS!!!!
In Brian Greene's "A Physicist Explains Why Parallel Universes May Exist", what reason does Greene give for why he believes parallel universes may exist?
Question 1 options:
Worm holes make traveling between parallel universes possible.
There are only so many ways matter can arrange itself within that infinite universe.
He has seen a parallel universe himself.
Scientists have already proven the existence of parallel universes.
Answer:
B: There are only so many ways matter can arrange itself within that infinite universe.
The idea of a parallel universe was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.
A parallel universeMatter is anything that has mass and occupy space. The universe as we know it is filled with matter. The theory of multiple universe holds that there could be another universe apart from this one that we know.
This theory was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.
Learn more about universe: https://brainly.com/question/9904853
The first asteroid to be discovered is Ceres. It is the largest and most massive asteroid is
our solar system’s asteroid belt, having an estimated mass of 3.0 x 1021 kg and an orbital
speed of 17900 m/s. Determine the amount of kinetic energy possessed by Ceres.
Answer:
kinetic energy possessed by Ceres = 4.806 × 10^(29) J
Explanation:
We are given;
Estimated mass; m = 3 × 10^(21) kg
Orbital speed; v = 17900 m/s
Formula for kinetic energy is;
K.E = ½mv²
K.E = ½ × 3 × 10^(21) × 17900²
K.E = 4.806 × 10^(29) J
Thus;
kinetic energy possessed by Ceres = 4.806 × 10^(29) J
Based on the kinetic theory, which statement is true?
Matter is made up of only charged particles.
The particles of matter are stationary.
The particles of matter have zero kinetic energy.
Matter is composed of very small particles.
Answer:Matter is made up of only charged particles.
Explanation: Took the test
1. What is the major determining factor in soil formation? Define this factor and explain how it influences soil formation.
PLEASE HELP ME PLEASE
Answer:
Temperature and precipitation
Explanation:
They determine how quickly weathering will be, and what kind of organic material may be available on the inside of the soils.
Temperature and precipitation is the major determining factor in soil formation. They define the type of organic material that can be present inside the soils as well as how rapidly weathering will occur.
What is soil?The bioactive, porous media that has grown in the top layer of the Earth's crust is known as soil. Being a source of water as well as nutrients, a filter for harmful wastes, a site for their breakdown, and a participant inside the cycle of elements such as carbon through the planet's ecosystem, soil constitutes one of the main substrates of life on Earth.
It has changed as a result of weathering processes influenced by geographical, geologic, biological, and climatic factors. A practical understanding of soils including their management has also developed out of need since the development of agriculture with forestry in the eighth millennium BCE. Temperature and precipitation is the major determining factor in soil formation. They define the type of organic material that can be present inside the soils as well as how rapidly weathering will occur.
Therefore, temperature and precipitation is the major determining factor in soil formation.
To know more about soil, here:
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1. A mixture of 3 gases (A, B, and C) has a total pressure of 240kPa. If the partial pressure of
Gas A is 107 kPa and the partial pressure of Gas B is 55 kPa, what is the partial pressure of
Gas C?
Answer:
78 kPa
Explanation:
The total pressure is the sum of the partial pressures:
240 = Pa + Pb + Pc
240 = 107 + 55 + Pc
Pc = 78 kPa
Answer:
78 kPa
Explanation:
What type of reaction is illustrated?
2S03 —> 2S02 + O2
Answer:
synthesis reaction
Explanation:
synthesis reaction where reactants unite to form a single product.
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.
im struggling and dont want to fail
Answer: Hey I am sure you will do great just try your best
Explanation:
Using the information in the passage, rank the types of galaxies by their ability to form new stars, from most to least activity.
Answer:
The correct answer is number 2. Elliptical, Spiral, Irregular.
Explanation:
Unfortunately, you did not attach the passage. Without the passage, we do not know what its content is.
So we are going to answer this question with our own knowledge.
The types of galaxies by their ability to form new stars, from most to least activity are "Elliptical, Spiral, Irregular."
That is the way astronomers classify galaxies in scientific terms. These scientists consider that the smallest galaxies or dwarf galaxies have approximately 100 million stars. On the other hand, giant galaxies have billions or trillions of stars. That immense is our universe.
Scientists still studying the universe and the galaxies to understand the way galaxies are formed.
Please help me on this!!
Answer:
OK
Explanation:
OK
The daily change from daylight to darkness is caused by:
Answer:
The daily change from daylight to darkness is caused by:the rotation of the Earth on its axis. If the Earth did not rotate as it does, the day/night cycle would be very different or possibly even nonexistent.
Explanation: