Answer:
A baseball speeds up as it falls through the air.
Yes. Forces on the balloon are unbalanced.
The balloon is speeding up, so we know that the downward force
of gravity is stronger than the upward force of air resistance.
A soccer ball is at rest on the ground.
No. The ball is not accelerating, so we know that the forces on it
are balanced.
The downward force of gravity on the ball and the upward force
of the ground are equal.
An ice skater glides in a straight line at a constant speed.
No. The skater's speed and direction are not changing, so he is not
accelerating. That tells us that the forces on him are balanced.
A bumper car hit by another car moves off at an angle.
Yes. The direction in which the car was moving changed.
That's acceleration, so we know that the forces on it are unbalanced,
at least at the moment of impact.
A balloon flies across the room when the air is released.
Yes. The balloon was not moving. But when the little nozzle was
opened, it started to zip around the room. So its speed changed.
And, as it goes bloozing around the room, its direction keeps changing too.
There's a whole lot of acceleration going on, so we know the forces on it
are unbalanced.
what role do guanacos play in the
Grasses and plants are producers, guanacos are herbivores and are primary consumers and pumas are predators and secondary consumers
Which type of rock does B represent?
A. Igneous rock
B. Metamorphic rock
C. Rock formed by compaction
D. Rock formed by heat and pressure
Answer:
A. because it came from a volcano
Explanation:
Answer: Igneous rock is formed by the melting and cooling of magma or lava.
Inside of Earth, magma slowly cools, creating rock with an irregular or rough texture and large crystals. Magma cooling inside Earth creates intrusive igneous rock.
Outside of Earth, lava cools very quickly, creating rock with a fine, grainy look or texture and small crystals. Lava cooling outside of Earth creates extrusive igneous rock.
Examples: granite, basalt, and pumice
B. The highly toxic gas phosgene is produced by the reaction CO(g) + Cl2(g) COCl2(g), ΔH = –108 kJ/mol. Use this reaction to answer the following questions.
i. How would increasing the pressure of the system affect the reaction yield? Explain your answer. (2 points)
ii. How would increasing the pressure of the system affect the reaction rate? Explain your answer. (2 points)
iii. How would increasing the temperature of the system affect the reaction yield? Explain your answer. (2 points)
iv. How would increasing the temperature of the system affect the reaction rate? Explain your answer. (2 points)
Answer:
I. Increasing pressure will allow more frequent successful collision between particles due to the particles being closer together.
II. Rate of reaction increases due to more products being made; as increased pressure favours the exothermic side of the equilibrium.
III. Increasing temperature provides particles lots of (Kinetic) energy, for more frequent successful collision due to the particles moving at a faster rate than before. However, favouring the endothermic side of the equilibrium due to lots of energy required to break and form new bonds.
IV. Rate of reaction increases due to increase temperature favouring both directions of the equilibrium - causing products to form faster.
Hope this helps!
I. Increasing pressure will allow more frequent successful collision between particles due to the particles being closer together.
II. Rate of reaction increases due to more products being made; as increased pressure favours the exothermic side of the equilibrium.
III. Increasing temperature provides particles lots of (Kinetic) energy, for more frequent successful collision.
IV. Rate of reaction increases due to increased temperature favouring both directions of the equilibrium - causing products to form faster.
What is toxic gas phosgene?Phosgene is extremely toxic by acute (short-term) inhalation exposure. Severe respiratory effects, including pulmonary edema, pulmonary emphysema, and death have been reported in humans.
I. If the pressure of gaseous reactants is increased, there are more reactant particles for a given volume. There will be more collisions and so the reaction rate is increased. The higher the pressure of reactants, the faster the rate of a reaction will be.
II. Increasing the pressure on a gas reaction shifts the position of equilibrium towards the side with fewer moles of gas molecules.
III. Increasing temperature provides particles lots of (Kinetic) energy, for more frequent successful collision due to the particles moving at a faster rate than before. However, favouring the endothermic side of the equilibrium due to lots of energy required to break and form new bonds.
IV. If the temperature is increased, the position of equilibrium moves in the direction of the endothermic reaction. if the temperature is reduced, the position of equilibrium moves in the direction of the exothermic reaction.
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A cheese puff contains 15 g of carbohydrate. If carbohydrates have a caloric value of 4 kcal/g, how many kcal are obtained from the carbohydrate in the cheese puff?
Will Mark Brainliest
Help Plss!!
hope it helps
cheese puff contains 15 g of carbohydrates
caloric value of carbohydrates=4kcal/g
1kcal=1000cal
4kcal/g= 4000cal/15g
ans. 266.6
kcal= 0.267 kcal.
At maximum, an f-subshell can hold __________ electrons, a d-subshell can hold __________ electrons, and a p-subshell can hold __________ electrons.
Explanation:
Different subshells hold a different maximum number of electrons. Any s subshell can hold up to 2 electrons; p supshell up to 6 electrons; d subshell up to 10; and f subshell up to 14.
40 POINTS!!!! PLEASE HELP
Answer:
after solving this you can get 40 points.
Consider a mixture of oil and water. What terms would you use to describe this mixture? Check all that apply. Heterogeneous homogeneous immiscible miscible.
Answer:
Its A and C
Explanation:
A mixture of oil and water is:
Heterogeneous
immiscible
What type of mixture of oil and water is?The water molecules attract each other, and the oil molecules stick together. That causes oil and water to form two separate layers. Water molecules pack closer together, so they sink to the bottom, leaving oil sitting on top of the water. The mixture can be called as Emulsion. It is an immiscible liquid and the mixture is heterogeneous as oil floats on top of water surface but do not mix with it.
Thus, correct options are Heterogeneous and immiscible.
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Hi! I’m so confused… what is the spin quantum number?? :0
Answer:
5 on k-12 that's the answer
Explanation:
Explanation:
nah so easy
it's a direction of electron spinning in the shell
+½ means electron spinning in clockwise direction
-½ means electron spinning in anticlockwise direction
What is the relationship between absorbance and transmittance of a sample in a spectrophotometer?
- indirect
- Direct
- No relationship
Plz help!! Plz!!
sodium is a metal give reason
Answer:
Because it exhibits metallic qualities, conducts electricity, and heats well, sodium is classified as a metal. Further, its structure is held together by so-called metallic bondings, which means that each atom contributes some electrons to the metal's electron cloud.
Explanation:
Answer:
Soduim is a metal because,sodium is a chemical element with the symbol Na (from Latin natrium) and atomic number 11. It is a soft, silvery-white, highly reactive metal. I hope this helps ⊙_⊙
What is the ratio between the substances in the balanced chemical equation? Start from the left and move to the right (start with the first reactant, end with the last product).
2NH3 + H2SO4 → (NH4)2SO4
Heat transfer is due to molecules colliding with neighboring molecules during _____, while heat transfer is due to molecules actually moving to another location during
Heat transfer which occurs when molecules collide with neighboring molecules is Conduction while heat transfer which is due to molecules actually moving to another location is Convection.
What is Heat transfer?This is the process in which thermal(heat) energy is moved from a hot region to a cold one.
There are three main types of heat transfer which are:
ConductionConvectionRadiationThe first two types is explained above and is the most appropriate choice.
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separate- Invertebrates and vertebrates
Snail
Earthworm
Cockroach
Butterfly
Snake
Answer:
Snail- Invertebrates
Earthworm- Invertebrates
Cockroach- Vertebrates
Butterfly-Vertebrates
Snake- Invertebrates
Explanation:
I don't know
Select all the correct answers. Which sentences describe an advantage of using a hydrogen fuel cell instead of burning fossil fuels?
Advantages:-
Fossil fuels like methane(Natural gas) on combustion releases carbon dioxide which is a major air pollutant.On the other hand hydrogen fuels don't do pollution much or in negligible amount.So hydrogen fuels are better
Answer:
The reaction of hydrogen and oxygen conveniently takes place inside a fuel cell.
Someday, it may be possible to produce hydrogen fuel using sunlight and water.
The reaction of hydrogen and oxygen doesn’t create products that negatively affect the environment.
Explanation:
PLATO
Use bond enthalpy values to calculate the enthalpy change for the following reaction. Then, label if the reaction is endothermic or exothermic. 1) CH4 (g) + Br2 (g) --> CH3Br (g) + HBr (g)
Based on the bond energies given, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.
What is the change in bond energy of a reaction?The change in bond energy of a reaction is calculated using the formula below:
change in bond energy = sum of energies of bonds broken - sum of energies of bonds formed
A reaction is exothermic if the change in bond energy is negative.
A reaction is endothermic if the change in bond energy is positive.
Given the bond enery values above:
sum of energies of bonds broken = 4 × C-H + Br-Br
sum of energies of bonds broken = 4 × 413 + 193 = 1845 kJ
sum of energies of bonds formed = 3 × C-H + C-Br + H-Br
sum of energies of bonds formed = 3 × 413 + 276 + 363 = 1878 kJ
Thus;
change in bond energy = 1845 - 1878 = -33 kJ
The reaction is exothermic because the change in bond energy is negative.Therefore, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.
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Explain the importance of organisms that convert nitrogen from its diatomic form into other compounds?
Explanation:
Bacteria play a key role in the nitrogen cycle.
Nitrogen-fixing microorganisms capture atmospheric nitrogen by converting it to ammonia— NH3start text, N, H, end text, start subscript, 3, end subscript—which can be taken up by plants and used to make organic molecules.
Based on the information shown, which of the following explains why the pressure in tank X is greater than that in tank Y ?
Tank X tank y
Ar(g) N2(g)
p=150atm p=130atm
v=70L v=70L
T=21 c T=21c
The pressure in tank X is greater than that in tank Y because the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.
What is the pressure of a gas?The pressure of a gas is the force that molecules of the gas exert per unit area of the walls of their container due the collisions of the gas molecules with themselves and with the walls of their contain.
The pressure of a gas is related to the volume (V), temperature (T) and number of moles (n) of the gas by the formula:
P = nRT/Vwhere;
R is molar gas constantn = mass/Molar mass.Since volume, temperature and R is constant for the two gases, the pressure difference will be determined by the number of moles of each gas.
Number of moles of a gas is proportional to the mass of the gas present.
Therefore, the best explanation as to why the pressure in tank X is greater than that in tank Y is that the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.
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Select the correct answer from each drop-down menu. Hydrogen can be created by [ Select ] water. If the activation energy is reduced, hydrogen can be produced with a renewable energy source. This renewable energy source is [ Select ] energy.
Answer 1) Decomposing Explanation : Hydrogen can be created by decomposing water. Electrolysis which is a method of passing electricity from the water and obtaining the products as hydrogen and oxygen is done by decomposition of water. The water molecule is broken down into its constituents.
Answer 2) Solar energyExplanation :If the activation energy is reduced, hydrogen can be produced with a renewable energy source. This renewable energy source is Solar energy.Solar energy from the sun can be used to lower the energy of activation during the decomposition of water. Solar energy is a renewable energy source as it comes from the sun and is replenish-able unlike fuels which cannot be replenished. The solar energy can be collected and utilized for production of hydrogen.
10.
What are the products of a neutralization reaction?
an acid and a base
a salt and water
a salt and an acid
water and a base
STOP DELETING THIS IT IS A CHEMISTRY QUESTION
Answer:
a salt and water is the answer.
what is the ionic equation for potassium fluoride and ammonium nitrate
Answer:
kf+Nh4 no3 --> kno3+nh4f
Consider the reaction below. HClO3 NH3 Right arrow. NH4 ClO3– Which is a base-conjugate acid pair? NH3 and ClO3– NH3 and NH4 HClO3 and NH3 HClO3 and NH4.
Bronsted-Lowry acid-base theory states about the donation or the acceptance of the protons by the chemical species. [tex]\rm NH_{3}[/tex] and [tex]\rm NH_{4}^{+}[/tex] are the base/conjugate acid pair.
What are the acid and base pairs of the lowry theory?According to this theory, the bases are the proton [tex](\rm H^{+})[/tex] acceptors and acids are proton contributors, the reaction between the species of the acids and bases results in the proton transfer.
An acid that donates or loses the proton to form an ion or molecule forms a conjugate base while the base that accepts proton are called conjugate acids. It can be shown as,
[tex]\rm acid + base \rightleftarrows conjugate\; base + conjugate \;acid[/tex]
In the reaction of [tex]\rm HClO_{3}[/tex] and [tex]\rm NH_{3}[/tex] the chloric acid acts like acid and donates proton while ammonia acts as a base because it accepts the proton.
Therefore, option B. [tex]\rm NH_{4}^{+}[/tex] is the conjugate acid of the ammonia and[tex]\rm ClO_{3}^{-}[/tex] is the conjugate base of chloric acid.
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Answer:
B.) NH3 and NH4+
Explanation:
"What can I say except your welcome" -Maui, 2016
What correctly describes the relationship between the spectrum of one atom and the spectrum of another?.
Answer:
There is an intimate connection between the atomic structure of an atom and its spectral characteristics. Atoms of individual elements emit light at only specific wavelengths, producing a line spectrum rather than the continuous spectrum of all wavelengths produced by a hot object.
Explanation:
Learning Task 2 Tract the location of Tropical Storm Sendong and plot each latitude and longitude pair on the map with the PAR below.
Philippine Map and its Vicinity
Which organism would have the most variation in the DNA of its offspring
Answer:
The organism that would have the most variation in the DNA of its offspring is the CAT (i would know). Hope this helped you!
We can measure the rate of reaction by:
-
-
system of equations You and your friend are making 30 liters of sodium water. You have liters of 10% sodium and your friend has liters of 22% sodium. How many of your liters and how many of your friend's liters should you mix to make 30 liters of 15% sodium
Answer:
X liters of 10% + (30 - x) liters of 22% = 30...
help! please! hurry! I will mark brainliest if you get it correct!! NO SPAM!!!!!!
The wavelength of green light is 522 nm. What is the frequency of this radiation
Answer: 5.747 * 10^14 Hz
Explanation:
Convert 522nm to m = 522 * 10^-9 m (since 1nm=10^-9m)
If c = wavelength * frequency, where c is the speed of light (3.0 * 10^8 m/s), then you can manipulate the equation to solve for frequency (f).
f = c / wavelength
Plug in the given numbers:
f = (3.0 * 10^8) / (10^-9)
f = 5.747 * 10^14 Hz
Answer:
The wavelength λ is the distance between successive peaks in a wave. The frequency f of a wave is the number of complete waves that pass a point in a given time. where c is the speed of light. In your case, λ = 522 nm = 522 × 10⁻⁹ m and c = 2.998 × 10⁸ m·s⁻¹
Explanation:
Identify features that are present in eukaryotic cells but not in prokaryotic cells.
Answer:
Eukaryotic cells have membrane bound organelles including:
- Nucleus
- Mitochondria
- Golgi apparatus
- Vacuoles
- Endoplasmic reticulum
- Chloroplasts
Prokaryotic cells do not have these organelles.
Many forensic scientists remain working in a lab while evidence is collected by police officers.
A.
True
B.
False
Answer:
True
Explanation:
Document and photograph the evidence. Properly secure the evidence by placing it in a paper bag or envelope. Close, seal, or tape the paper bag or envelope. The examiner must initial, date, and time across the sealed area. Label the bag or envelope with the patient's identifying information.
Also, I took the quiz :)
What temperature particles have a high kinetic energy
Particles at the same temperature have the same average kinetic energy, so argon and nitrogen, which are at 20°C, are the gases with the lowest average kinetic energy. Nitrogen and helium, at 100°C, have the highest average kinetic energy because they have the highest temperature.