Answer:
Calcium has an Atomic number of 20 and Atomic mass of 40.078 u
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Pressure is caused by __________ within the container.
comman factors that can lead to high blood pressure include.
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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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...
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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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.
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
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
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:
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.
Which of the following best explains the difference in the solubility in water of the alcohols listed in the table
Answer:i do not know can i get brainliest im broke
Explanation:
brainliest please
The solubility of the alcohols in water increases as the number of hydrogen bonds they can form with water increases.
What is solubility?A solution consists of a solute and a solvent. See the saltwater example to understand the difference between the two. Water is a solvent because it is a substance used to dissolve solutes.
Salt is a solute because it is a substance dissolved in water. Solvents tend to be more abundant in solution. Solution can exist in the form of all three states of matter.
Solubility is the ability of a solute to dissolve in a solvent to form a solution. This is the nature of dissolving sugar molecules and the like in coffee. Water is known as the "universal solvent" because it can dissolve most substances, but there are some exceptions.
Solubility forms new bonds between solute and solvent molecules. It is the maximum concentration of a solute that will dissolve in a solvent of known concentration at a given temperature.
Therefore, The solubility of the alcohols in water increases as the number of hydrogen bonds they can form with water increases.
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What is the relationship between absorbance and transmittance of a sample in a spectrophotometer?
- indirect
- Direct
- No relationship
Plz help!! Plz!!
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:
what is the ionic equation for potassium fluoride and ammonium nitrate
Answer:
kf+Nh4 no3 --> kno3+nh4f
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 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
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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Photosynthesis is the reaction by which green plants convert water and carbon dioxide into glucose and oxygen using sunlight (radiant energy).
The chemical equation for photosynthesis is below.
6CO2 + 6H2O + sunlight energy ——> C6H1206 + 602
What evidence can you provide that shows photosynthesis is an endothermic reaction?
Answer:
Photosynthesis is considered an endothermic reaction, because during the process of photosynthesis, energy from the sun or sunlight is being absorbed.
Explanation:
Any chemical reactions that absorb heat energy from the surroundings to form products is termed the endothermic reaction.
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.
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
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 ⊙_⊙
Which statement describes chromosomes? 27 points
coiled threads of DNA
a spiral molecule
simple chemicals which link the strands
none of the above
Answer:
coiled threads of DNA
Explanation:
Chromosomes are long stretches of DNA packed together by proteins.
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.
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 :)
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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We can measure the rate of reaction by:
-
-
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
40 POINTS!!!! PLEASE HELP
Answer:
after solving this you can get 40 points.
Please help 25 points!!!
Answer:
solve this and get 25 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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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.