Answer: D is ur answer
Hope it helps chu!
Have a good day, My fellow bean UwU
About what percent of the Earth is covered in salt water oceans?
A.84%
B.71%
C.49%
D.65%
Answer:
B
Explanation:
What is electroluminescence? Give one example.
Answer:
electroluminescence is a production of light by the flow of electrons, as within certain crystals. An example is at most resataurants with a bright sign that either says open or closed.
Explanation:
_8. Which factor(s) will increase the solubility of a solid?
C. increase surface area
D. increase agitation.
A. Increase temperature B.increase pressure
TRUE or FALSE?
Science
Answer:
1 is False
2 is False
3 Is True
4 is True
5 is false
The process that is the opposite of sublimation is called deposition. Use the example of frost formation to infer why this process has this name.
Answer:
See explanation
Explanation:
Sublimation refers to the movement of molecules directly from solid into the vapor or gas phase while deposition refers to the movement of molecules directly from the gas phase into the solid phase. The two are opposite to each other.
Frost is formed in a situation where a substance cools to a temperature that is lower than its dew point. In this situation, the vapour is directly deposited on a surface to form a frost without passing through a liquid phase. Hence the name, deposition.
Group 2, Period 6
whats the answer for this please it's on the periodic table
Answer:
Group 2, Period 6
Barium (Ba)
Explanation:
A cube, with a mass of 21 g is dropped in a graduated cylinder with 10 mL
water. The water level rises to 24 mL when the cube is added. What is the
cube's density (don't forget units)
Answer:55ml
Explanation:
Photosynthesis is a process that can be performed by many autotrophic organisms within the ecosystem. Without photosynthetic organisms, the food chain would not be able to sustain the energetic needs of the ecosystem. Whic statement compares the energy transformations that occur in the ecosystem within photosynthetic organisms?
A Solar energy is converted to thermal energy, which increases food availability for the ecosystem.
B Solar energy is converted into chemical potential energy, which is found in the products like glucose.
C Chemical erlergy in carbon dioxide is converted into solar energy, which provides a mechanism to produce food for the ecosystem.
D Kinetic energy of the reactants is converted to potentia. energy in the products, which can be metabolized within the ecosystem.
Answer:
B.
Solar energy is converted into chemical potential energy, which is found in the products like glucose.
Explanation:
According to photosynthesis phenomena ,the statement which compares energy transformations in ecosystem within photosynthetic organisms is statement B.
What is photosynthesis?It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy through the process of cellular respiration.
Some of the energy which is converted is stored in molecules of carbohydrates like sugar and starches which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.
The process begins with proteins absorbing light energy which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.
Learn more about photosynthesis,here:
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Which of the following (H+) values describes a neutral solution?
O 10-1M
O 10-7M
10-14 M
O 10-12M
Answer:10-^7M
Explanation: this is a neutral solution as the [H+] and [OH-] is of same value ie,10-^7M
What volume of hydrogen is necessary to react with 6.25g of nitrogen to produce ammonia?
(Assume constant temperature and pressure.)
A. 30L
B. 15L
C. 6.2L
D. 12.5L
Calculate the amount of heat lost by 23 g of water when its temperature drops from 68.0°C to 31.0°C. The specific heat of water is 4.18 J/(g°C).
Answer:
3557J is the heat lost by the water
Explanation:
Using the equation:
Q = m*C*ΔT
Where Q is change in heat
m is mass of substance (23g of water)
C is specific heat of the substance (4.18J/g°C)
And ΔT is change in temperature (68.0°C - 31.0°C = 37.0°C)
we can find the amount of heat lost as follows:
Q = 23g*4.18J/g°C*37°C
Q =
3557J is the heat lost by the water
(b) Which solution has a higher percent ionization of the acid, a 0.10M solution of HC2H3O2(aq) or a 0.010M solution of HC2H3O2(aq) ? Justify your answer including the calculation of percent ionization for each solution.
Answer: The percent ionization is higher for 0.010 M solution of [tex]HC_2H_3O_2[/tex]
Explanation:
[tex]HC_2H_3O_2\rightarrow H^+C_2H_3O_2^-[/tex]
cM 0M 0M
[tex]c-c\alpha[/tex] [tex]c\alpha[/tex] [tex]c\alpha[/tex]
So dissociation constant will be:
[tex]K_a=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]
a) Given c= 0.10 M and [tex]\alpha[/tex] = ?
[tex]K_a=1.8\times 10^{-5}[/tex]
Putting in the values we get:
[tex]1.8\times 10^{-5}=\frac{(0.10\times \alpha)^2}{(0.10-0.10\times \alpha)}[/tex]
[tex](\alpha)=0.013[/tex]
[tex]\%(\alpha)=0.013\times 100=1.3\%[/tex]
b) Given c= 0.010 M and [tex]\alpha[/tex] = ?
[tex]K_a=1.8\times 10^{-5}[/tex]
Putting in the values we get:
[tex]1.8\times 10^{-5}=\frac{(0.010\times \alpha)^2}{(0.010-0.010\times \alpha)}[/tex]
[tex](\alpha)=0.041[/tex]
[tex]\%(\alpha)=0.041\times 100=4.1\%[/tex]
The percent ionization is higher for 0.010 M solution of [tex]HC_2H_3O_2[/tex]
What should be the first thing human try and research/solve with genetics?
Genetic disorders that are extremally dehabilitating
5. What mass of the following solutes will dissolve in 100 ml of water?
KNO3 at 50o C? ______________________________
NH4Cl at 50o C? _________________________________
NaNO3 at 50o C? _______________________________
Answer: 130g , 40g , 70g
Explanation:
Which atom is more likely to form a cation?
Ca
N
Kr
F
Answer:
Halogens always form anions, alkali metals and alkaline earth metals always form cations
Explanation:
Consider the following representation of a reaction mechanism.
Step 1: A+A → C+E (slow)
Step 2: E + B → A+D (fast)
Overall reaction: A + B → C + D
What should appear in the rate law for the reaction above?
A) only A and B because they are reactants in the overall reaction
B) only C and C because they are products in the overall reaction
C) only A because it is the reactant in the rate-determining step
D) only E and B because they are the reactants in the rate-determining step
A gas has a of 590 mi. At a temperature What volume will the gas occupy at 30.0öc.1 Which gas law is this
The given question is incomplete. The complete question is:
A gas has a volume of 590 ml at a temperature of [tex]0^0C[/tex].What volume will the gas occupy at [tex]30.0^0C[/tex]. Which gas law is this?
Answer: 655 ml , Charle's Law
Explanation:
To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where,
[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.
[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.
We are given:
[tex]V_1=590ml\\T_1=0^oC=(0+273)K=273K\\V_2=?\\T_2=30.0^0C=(30+273)K=303K[/tex]
Putting values in above equation, we get:
[tex]\frac{590}{273}=\frac{V_2}{303}\\\\V_2=655ml[/tex]
Thus the volume at [tex]30.0^0C[/tex] is 655 ml
5. Which set of coefficients will balance this chemical
equation?
_C2H4(g) +
O2(g) → 2CO2(g) + 2H2O(g)
A. 1.2
B. 1.3
C. 2.3
D. 2.5
Answer: The answer is B 1,3
Would you see more living things in a Biome or an Ecosystem?
Answer:
A Biome is way bigger than a ecosystem
Explanation:
answer: biome
because many ecosystems can make up a single biome.
The boiling point of a liquid is the temperature at which its ____________ _____________ is equal to ____________ ____________.(atmospheric pressure, vapor pressure
Answer:
vapor pressure, atmospheric pressure
Explanation:
the boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it.
(I'm not too sure if this is right but I think it is)
Dihydrogen sulfide reacts with oxygen gas to form sulfur dioxide and water. How many moles of oxygen gas will react when 0.6469 moles of water are formed?
Answer: 0.9704 moles of [tex]O_2[/tex] will react when 0.6469 moles of water are formed.
Explanation:
The balanced chemical reaction is:
[tex]2H_2S+3O_2(g)\rightarrow 2SO_2+2H_2O[/tex]
According to stoichiometry :
2 moles of [tex]H_2O[/tex] are formed from = 3 moles of [tex]O_2[/tex]
Thus 0.6469 moles of [tex]H_2O[/tex] are formed from =[tex]\frac{3}{2}\times 0.6469=0.9704moles[/tex] of [tex]O_2[/tex]
Thus 0.9704 moles of [tex]O_2[/tex] will react when 0.6469 moles of water are formed.
What is the concentration of a solution with a volume of 2.50 liters containing 630. grams of calcium phosphate, Ca3(PO4)2?
Answer:
L=0.85M
Explanation:
ca3 (po4)
66gX1mol/310.18g=2.2178mol/2.5
Which of the following statements is true about a light-year?
A) It is the distance to Alpha Centauri.
B) It is shorter than the astronomical unit.
C) It is used to measure long periods of time.
D) It is used to measure long distances in space.
Answer:
D
Explanation:
Answer:
I pretty sure its D
Explanation:
because I dont think that it measures long periods of time I could be wrong tho if I am I'm sorry
What is the definition of a Double Displacement Reaction?
Answer:
A double displacement is a type of chemical reaction that in which the reactant ions exchange places to form new products
Explanation:
I took the quiz
Answer:
When two different atoms or groups of atoms are exchanged, then it is a double displacement reaction.
How many moles are in 212.46 grams of H2SO4?
Answer:
2.16622443577839
Explanation:
Answer:
It would be 2.16622443577839.
Explanation:
What causes a repeating pattern of day and night
Answer:
Rotation of the Earth causes night and day to alternate. Since we learned that the Earth's axis is tilted and hence the equator is not facing the Sun directly, different places on Earth would experience unequal length of days and nights—not exactly 12 hours of day and 12 hours of night all the time.
Explanation:
Which of the following is the most important reason for people to carefully manage natural resources?
A.) Recycling facilities are being constructed around the world.
B.) Underground reserves of oil have not yet been discovered.
C.)Technology that uses natural resources more efficiently are being developed.
D.)The growing human population is putting increasing demands on natural resources.
Answer:
The growing human population is putting increasing demands on natural resources.
Explanation:
In an ecosystem, the most important reason for people to carefully manage natural resources is that the growing human population is putting increasing demands on natural resources.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
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what element is solid at room temperature shiny malleable and a good conductor of heat
Answer:
I believe that it would be copper because copper is all of those things.
Explanation:
why do men
thats it that’s the question
Explanation:
babe I wish I knew I would tell you
Answer:
Not all men are like this. It depends on how they were raised
When does the object change direction?
Distance vs. Time
50
40
30
20
10
c
D
2
6
8
10
Time
F
Answer:
50distance and 10minutes time
Explanation:
because it's the best object