Explanation:
The compound with both ionic and covalent bonds is Ammonium chloride (NH4Cl).
For the reaction H2(g) + 12(g) = 2HI(g), Kc = 50.2 at 445°C. If
[H2] = [12] = [HI] = 1.75 x 10-3 Mat 445°C, which of the
following is true based on the above?
Qc < Kc, the reaction proceeds from left to right to reach equilibrium
Further explanationGiven
K = 50.2 at 445°C
[H2] = [I2] = [HI] = 1.75 × 10⁻³ M At 445ºC
Reaction
H2(g) + I2(g) ⇔2HI(g)
Required
Qc
Solution
Qc for the reaction
[tex]\tt Qc=\dfrac{[HI]^2}{[I_2][H_2]}\\\\Qc=\dfrac{(1.75.10^{-3})^2}{1.75.10^{-3}\times 1.75\.10^{-3}}=1[/tex]
Qc < Kc ⇒ reaction from left(reactants) to right (products) (the reaction will shift on the right) until it reaches equilibrium (Qc = Kc)
two examples for magnetic and nonmagnetic materials
Answer:
Magnetic: Iron and nickel
Nonmagnetic: Rubber, feathers and/or leather
Explanation:
Hope this helps!
True or False:
All stars are the same color.
Answer:
False
Explanation:
They are not the same color since they do not all have the same temperature
Temperature defines their color
What is the energy of a photon (J) that has a wavelength of 105 nm?
Answer:
3.46
⋅
10
−
19
J
The energy of a photon is proportional to its frequency, as stated by the Planck - Einstein's equation
E
=
h
⋅
ν
, where
E
- the energy of the photon
h
- Planck's constant, equal to
6.626
⋅
10
−
34
J s
ν
- the frequency of the photon
Now, notice that you are given the wavelength of the photon,
λ
. As you know, frequency and wavelength have an inverse relationship described by the equation
λ
⋅
ν
=
c
, where
c
- the speed of light in vacuum, approximately equal to
3
⋅
10
8
m s
−
1
This means that the relationship between energy and wavelength looks like this
λ
⋅
ν
=
c
⇒
ν
=
c
λ
E
=
h
⋅
c
λ
Another important thing to notice here is that the wavelength of the photon is given in nanometers,
nm
. You need to convert this to meters, the unit used for the value of the speed of light.
E
=
6.626
⋅
10
−
34
J
s
⋅
3
⋅
10
8
m
s
−
575
⋅
10
−
9
m
=
3.46
⋅
10
−
19
J
Explanation:
Brainliest please?
As the amplitude decreases in a wave, the energy increases.
Lesson 4.07
Question 6 options:
True
False
Answer:
False
Explanation:
The relationship between energy and amplitude can be written as eαa^2
This means that the energy of a wave is directly proportional to the square of the amplitude.
A football player has to run 60 meters in 5 seconds or less in order to make the all-star team. What is the slowest speed he can run in order to qualify for the all-star team?
Explanation:
It is given that,
A football player has to run 60 meters in 5 seconds or less in order to make the all-star team.
We need to find the slowest speed he run in order to qualify for the all-star team. Let it is v. It can be calculated as follows :
v = d/t
= 60 m/5 s
= 12 m/s
It means his slowest speed is 12 m/s and he should increase his speed in order to qualify for the all-star team.
bacon head chicken noob
Answer:
alright that sounds like a recipe i gota try
Answer:
cool!!!
Explanation:
WHICH DEFINTIOION GOES TO EACH LETTER/WORD. FILL IN THE BLANK
-
The place inside Earth where the energy is an earthquake is centered is the ________.
-
The instrument used to record earthquake activity is a/an __________.
-
The __________ of an earthquake is the point on the surface of Earth directly above the focus.
-
The __________ of an earthquake is based on the amplitude of the seismic waves.
-
An undersea earthquake may produce a/an _________.
-
Buildings constructed to withstand most earthquakes are said to be _________ ________.
-
_______ is magma that has flowed onto Earth's surface.
-
The __________ is divided into about 13 major plates.
-
________ are long cracks produced at divergent plate boundaries.
-
The __________ scale measures the magnitude of an earthquake.
-
The seismic waves that do the most damage to structures and property during an earthquake are _________ _________.
-
An avalanche of glowing rocks flowing on a cushion of hot gases is called a/an ___________ __________.
-
A large, broad volcano with gently sloping sides that is formed by the build-up of basaltic layers is a ________ volcano.
-
A relatively small volcano formed by moderate to explosive eruptions of tephra is a _________________ volcano.
-
A steep-sided volcano formed from alternating layers of violent eruptions of tephra and quieter eruptions of lava is a ___________ volcano.
-
The movement of the ground that occurs when rocks inside Earth pass their elastic limit, break suddenly, and experience elastic rebound is called a/an ______________.
-
A fracture that occurs when rocks break and that results in relative movement of opposing sides is called a ________.
A.
lava
B.
fault
C.
seismic safe
E.
shield
F.
cinder-cone
G.
focus
H.
tsunami
I.
rifts
J.
seismograph
K.
hot spot
L.
surface waves
M.
epicenter
N.
Richter
O.
lithosphere
P.
earthquake
R.
composite
T.
magnitude
How many grams of water can be produced when 8 g of hydrogen react with 32 g oxygen?
Answer
[tex]--------------------------------------------[/tex]
According to Toppr, [tex]2\cdot2=4g[/tex] of hydrogen reacts with [tex]1\cdot32=32g[/tex] of oxygen to form [tex]2\cdot18=36g[/tex] of water. Hence, [tex]44=1g[/tex] of hydrogen reacts with [tex]432=8g[/tex] of oxygen to form [tex]436 = 9g[/tex] of water. [tex]9[/tex] grams of water can be produced when [tex]8[/tex]g of hydrogen reacts with
[tex]--------------------------------------------[/tex]
Hope this helps! <3
[tex]--------------------------------------------[/tex]
Gas stoichiometry a sample of methane gas having a volume of 2.80 L at 25c and 1.65 atm was mixed with a sample oxygen gas having a volume 35.0L at 31c and 1.25 atm . The mixture was then ignited to form carbon dioxide and water . Calculate the volume of co2 formed at a pressure of 2.50 atm and a temperature of 125 c
Answer:
2.47 L. CO2
Explanation:
First, let's establish what we need to find. The volume of CO2 formed at a pressure of 2.50 atm and a temperature of 125 C. Now, don't let this overwhelm you. To find the volume of CO2 formed, we must first find the amount of CO2 formed.
But to find the amount of CO2 formed, we have to write out the equation for this reaction. The type of reaction depicted here is combustion, where oxygen gas reacts with a substance to form carbon dioxide and water. And we also know that this equation must be balanced, according to the Law of Conservation of Matter. It is as follows:
CH4 + 2 O2 => CO2 + 2 H2O.
Now that we have the equation of the reaction, we can now find which of the two reactants is the limiting reactant. To do this, we need to convert the volumes of methane and oxygen gas to moles. Simply use the Ideal Gas Law to do this, and you get:
Methane Gas: .189 mol | Oxygen Gas: 1.75 mol
Using the equation, we can then see that methane gas is the limiting reactant.
We know, also due to the equation that 1 mol of CO2 is produced for every mol of methane gas. This gives us the answer of .189 mol of CO2 produced. But remember, the question asks us for the volume of CO2 produced, so we must apply the Ideal Gas Law once again, getting the answer of 2.47 L. CO2.
Note: Please remember to use significant figures during your calculations, and if you have any questions, feel free to post them down below.
Is smog a pure substance
Actually, interesting enough, smog is an example of a heterogeneous mixture. So no, it's not a pure substance.
Answer:
No, smog is not a pure substance.
Explanation:
Smog is a heterogeneous mixture, heterogeneous mixtures contain two or more phases.
Hope this helped :)
Animals have to eat other things to get their food, but plants can make it themselves. Plants are known as:
A. consumers
B. producers
C. chloroplasts
D. glucose
Answer:
Producersssssssssss
6. What is (are) the product(s) in this reaction?
CO2(g) + H2O(l) → H2CO3(aq)
a.
HCO3
b. H2O only
c. CO2 only
d. CO2 and H2O
Answer:
This type of reaction almost always produces a gas. The following are examples of decomposition reactions: Heating mercury (II) oxide produces oxygen gas: 2HgO (s) → 2Hg (l) + O2 (g). Leaving the cap off the carbonated soft drink bottle allows the carbonic acid to release carbon dioxide: H2CO3 (aq) → H2O (l) + CO2 (g). Hope this helps :)
Answer:
H2CO3
the product is H2CO3 because it is on the right side of the arrow where as the others are on the left side of the arrow (making them reactants)
Why does nitrogen have stronger attractive forces between its nucleus and valence electrons than phosphorus?
Answer:
Nitrogen atom is small in size than phosphorus thus the bond between its nucleus and valence electrons are stronger than phosphorus.
Hope it helps...｡◕‿◕｡
MARKING BRAINLIEST!!
Students learned that the job of the nucleus of an animal cell is to control all of the cell's activities.
A. Which organ system has a similar function?
B. Respiratory system
C. Circulatory system
D. Nervous system
Muscular system
Which of the following statements best explains why some of the offspring
have white flowers?
Answer: C.
Explanation: These offspring inherited a DNA sequence coding for white flowers from each parent plant.
:)
PLEASEEEE I NEED HELPP
Write the reaction for the decomposition of sodium hydrogen carbonate to form sodium carbonate, water and carbon dioxide.
Answer:
Na2O + CO2 >> Na2CO3
Explanation:
Balanced. Single displacement, I think. SYNTHESIS
I think this is Right im not an expert so
Use the activity series below to predict whether the following reactions will take place.
Answer: I HAVE ATTACHED PROOF SO DONT REMOVE MY ANSWER, MODS.
1. NO
2. NO
Answer: 1. NO 2. NO
Explanation: Just did it and got it correct.
10 points Which of these is the best example of heat transfer by radiation? *
1 point
a) A satellite is warmed by sunlight.
b) A ceiling fan cools a warm room.
c) Butter melts on warm bread.
d) Puddles of water cool a warm tile floor.
Answer:
a) A satellite is warmed by sunlight.
Explanation:
Heat transfer by radiation mostly involves heat gain or heat loss from the Sun. In this case, Option A is the only option where sunlight is involved so it is the best example of heat transfer by radiation.
At which point is potential energy greatest
Answer:
W has the most potential energy
how many grams are there in 0.270 mol of lead (II) nitrate?
Answer:
67.0 g Lead (ll) Nitrate
Explanation:
first, find you mass for each element
Pb= 207 g
N=14 g
207(2)+14=428 g
now convert to grams using the standard moles conversion
0.270 moles (248 g/1 mole) = 66.96
round to the correct number of significant figures, 3.
66.96= 67.0 g
ANSWER THIS QUESTION AS QUICK AS YOU CAN YOU WILL GET BRAINLY AND PIONTS PLEASE HELP ASAP!!!!!!!!!!!!!!!!!
Which of the following is NOT true about comparisons between analog and digital signals?
Question 3 options:
Digital signals are pulses of voltage that switch currents on an off in devices like computers.
Analog signals are used to convert sound waves into electronic signals.
Digital signals are more prone to distortion.
Analog signals are more prone to distortion.
Answer:
Explanation: Analog signal is continuous in nature as it is well defined for every specific time. More specifically, it is the one defined continuously for a range of values with time. These are represented as a sinusoidal waveform. The figure below represents an analog signal:
analog signal
As we can see here that the signal is continuous in nature as its every value is specified for each particular interval of time, thus, is referred as the continuous-time signal. For the purpose of recording the analog signals, the actual signal must be preserved as only in that case we can record the accurate analog signal.
However, whenever in any application there arises a need to change an analog signal into a digital one then through sampling this can be achieved. In the sampling technique, this signal is sampled at certain fixed time intervals and the sampled voltage is converted into digital values.
Definition of Digital Signal
A type of signal which is non-continuous in nature as it is defined only for a set of discrete times is known as a digital signal. More simply, we can say, it is specified at some particular time instants only. Thus, here the information is represented as a set of discrete values. The figure given below shows the signal representation in digital form:
digital signal
Here it is clear that the data is discretely positioned in time axis thus is shown in the form of bits i.e., 0 and 1. This means that here the signal performs the sudden transition between 0 and 1 where these two values correspond to the two voltage levels. For the purpose of recording the signals, in the digital one, only the samples of the actual signal are taken and not the whole signal.
Key Differences Between Analog and Digital Signal
Analog and digital signals are differentiated mainly on the basis of their way to carry the information. Analog signals represent the information as a continuous function of time. As against, digital signals are represented discretely at specific time intervals.
Analog signals deteriorate more easily than digital one as their susceptibility towards noise is higher.
The devices that operate on an analog signal need more power for transmission and reception than the devices that work on the digital signal.
The information represented by the analog signal is comparatively more accurate than the digital signal due to its continuous range of values.
Analog signals are transmitted at a slower rate than digital signals as the information holds more values thus is precise.
An analog signal is defined by the amplitude, phase, frequency, etc. While the digital signal is mainly associated with bit rate, bit intervals, etc.
The sinusoidal representation of the analog signal makes it difficult to understand or get decoded thus encryption is not required in analog signals. But as the digital signals are in the form of square waves, thus, it can be decoded easily hence need to be encrypted for secured communication.
On the basis of processing, it is said that the continuous nature of the signal offers easy processing of the analog signal. However, the discrete nature of the signal offers difficultly in the processing of the digital signal.
Conclusion
Thus, the above discussion concludes that due to the way of representing the signal, the two are differentiated. And because of this, the two types of signals possess different properties and are used in different applications. Like analog signals are used in radio wave transmission and reception whereas digital signals are used in the field of digital electronics.
Find the volume of 200g of benzene, if the density of benzene is 0.88 g/mL.
Answer:
227.27 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{200}{0.88} \\ = 227.2727...[/tex]
We have the final answer as
227.27 mLHope this helps you
What mass of zinc will completely react with 18.9 L of oxygen gas at 15°C and 1.50 atm pressure to produce zinc oxide. Remember to write a balanced. equation and fill in what is needed to answer this question on the BCA table.
Answer:
Mass of zinc react with oxygen = 156.91 g
Explanation:
Given data:
Volume of oxygen = 18.9 L
Temperature = 15°C
Pressure = 1.50 atm
Mass of zinc react with oxygen = ?
Solution:
Chemical equation:
2Zn + O₂ → 2ZnO
Number of moles of oxygen:
PV = nRT
1.50atm ×18.9 L = n× 0.0821 atm.L / mol.K × 288 K
28.35 atm.L = n× 23.64atm.L / mol
n = 28.35 atm.L / 23.64atm.L / mol
n = 1.2 mol
Now we will compare the moles of oxygen and Zn.
O₂ : Zn
1 : 2
1.2 : 2/1×1.2 = 2.4 mol
Mass of zinc required:
Mass = number of moles × molar mass
Mass = 2.4 mol × 65.38 g/mol
Mass = 156.91 g
How many moles are equal to 12.65 grams of Al2(SO4)3?
Answer:
0.03697 mol Al₂(SO₄)₃
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
12.65 g Al₂(SO₄)₃
Step 2: Identify Conversions
Molar Mass of Al - 26.98 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Al₂(SO₄)₃ - 2(26.98) + 3(32.07) + 12(16.00) = 342.17 g/mol
Step 3: Convert
[tex]12.65 \ g \ Al_2(SO_4)_3(\frac{1 \ mol \ Al_2(SO_4)_3}{342.17 \ g \ Al_2(SO_4)_3} )[/tex] = 0.03697 mol Al₂(SO₄)₃
Step 4: Check
We are given 4 sig figs. Follow sig fig rules and round.
We already have 4 sig figs in the final answer, so no need to round.
All matter has both physical and chemical properties.
True or False
Answer:
F
Explanation:
PLEASE HELPPPP
5. When calcium carbonate is heated, it decomposes to form solid calcium oxide and carbon dioxide gas. How many grams of carbon dioxide will be produced if 23.83 g of calcium carbonate reacts completely? (5pts)
CaCO3 → CaO + CO2
100.09g 56.08g 44.01g
6. The first step in the industrial manufacture of nitric acid is the reaction of nitrogen trihydride with oxygen to produce nitrogen monoxide and water. If 824 g of nitrogen trihydride are used, how many moles of nitrogen monoxide will be produced? (4pts)
4NH3 + 5O2 → 4NO + 6H2O
17.04g 32.00g 30.01g 18.02g
7. The reaction between 64.00 g solid sodium metal and 80.00 g iron (III) oxide produces sodium oxide and metallic iron. (15 pts)
6Na + Fe2O3 → 3Na2O + 2Fe 22.99g 159.70g 61.98g 55.85g
Determine (Clearly label each answer)
the limiting reactant
the mass of solid iron produced
the mass of excess reactant that remains after the reaction is complete.
8. When excess potassium sulfate is added to a solution containing 0.500 g silver nitrate, solid silver sulfate is formed along with potassium nitrate. (7 pts)
K2SO4 + 2AgNO3 → Ag2SO4 + 2KNO3
174.27g 169.88g 311.81g 101.11g
Determine the theoretical yield of the silver sulfate precipitate.
If 0.435 g of silver sulfate is obtained in the lab, calculate the percent yield
Answer:
explain futher pls
Explanation:
Please answer this question.
Mass of Helium = 4
Helium = 55 liters
How many moles = ?
_____________________________________SOLUTION:By the equation(AT S.T.P) of,
Moles = [tex]\frac{Given\ Volume}{22.4\ dm^3}[/tex]
Substitute the values,
Moles = [tex]\frac{55}{22.4}[/tex]
Simplify the fraction,
Moles = 2.5 grams/moles
_____________________________________Best Regards,'Borz'Hey please answer this thanks.
Explanation:
Percentage composition of oxygen = (80/134) * 100% = 59.7%.
You have 0.21 moles of Al how many atoms do you have
Number of atoms : 1.26 x 10²³
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
0.21 moles of Al, so n = 0.21
Number of atoms :
[tex]\tt N=0.21\times 6.02\times 10^{23}\\\\N=1.26\times 10^{23}[/tex]