Answer:
Chlorophyll-a/b-carotenoid complexes, known as light harvesting complexes, protect photosynthetic system from strong light. Chlorophylls are insoluble in water due to the absence of polar groups.
Explanation:
Hope this helps :)
HELP NOW Do Now 3.5 Purple
Do Now 3.5 Purple
POSSIBLE POINTS: 100
Why can I smell a chocolate bar even though it is a solid?
Read the description of the office mystery and write your prediction below.
On a warm afternoon, a Universal Space Agency office worker returned from lunch break and noticed the office smelled like chocolate.
She didn't see anything in the air, but she noticed her coworker was opening the wrapper of a solid bar of chocolate. Why can the
office worker smell the chocolate bar even though it is in solid form?
Sim
• 1. Use the Sim to determine if the molecules of a substance can be in two different phases at the same time.
• 2. Go through each substance and see if you can get it to exist in two phases at once.
Directions
Using evidence from the articles you have read as well as the Sim and other activities you have completed in this lesson, write down
your initial ideas about why this mystery occurred. Be ready to share your ideas.
В І
Answer:
The smell of a chocolate is from the presence of volatile compounds present in the chocolate bar which at room temperature readily changes phase from solid to liquid to vapor or gas
Explanation:
There are nearly 600 identified compounds present in a chocolate bar and out of these, there are volatile components which gives the chocolate bar its distinctive aroma.
These volatile chocolate contents readily change phase from solid to vapor, with very short duration liquid phase.
For example, 3 methylbutanal, vanillin, and several organic compounds which are known to be readily volatile.
what is the temperature of 0.750 of a gas stored in a 6,850 mL cylinder at 2.21 atm?
When limestone (which is principally CaCO3) is heated, carbon dioxide and quick- lime (Cao) are produced by the reaction CaCO3(s) Cao(s) + CO2(g). If 17.6 g of CO2 was produced from the ther- mal decomposition of 40.92 g of CaCO3, what is the percentage yield of the reaction? Answer in units of %.
Answer:
B.They show that the speaker’s memories come from various senses and seasons.
B.They show that the speaker’s memories come from various senses and seasons.
Explanation:
From the chemical reaction Na + Cl2 --> NaCl. How many liters are in NaCl from 2.5 mol of Cl2
Answer: The limiting reactant is
Na
. The theoretical yield is 112 g
NaCl
.
Explanation:
How many moles of aluminum are needed to react with 12 moles of hydrochloric
acid
Calculate the value of Kp at 227°C for the equilibrium: 3 A(g) ⇌ B(g) + D(g) Kc = 5.15
a. 7.52
b. 0.125
c. 96.0
d. 0.0653
e. 276
Newton's second law states that force is equal to
mass times weight
mass times acceleration
weight divided by mass
weight times acceleration
Don’t understand need explanation and answer will give brain list
Answer:
B. is the answer.
Explanation:
Hello there!
In this case, since the law of conservation of mass states that matter cannot be created nor destroyed, we infer that the correct answer must have the same number of atoms at both sides of the equation.
Therefore, we can see how B. has three white molecules as well as three black molecules at the reactants side and after the chemical reaction there are two molecules having a total of three of each molecule at the products side unlike the other choices; for that reason the correct answer is B.
Best regards!
A .60 L sample of nitrogen is heated from 27℃ to 77℃ at a constant pressure. What is the final volume of the gas?
(show work please)
Answer:
CHARLES' LAW
given:
= 600 mL = 0.6 L
= 27 °C = 300.15 L
= 77 °C = 350.15 L
conversion:
= 600 mL (1 L / 1000 mL)
= 0.6 L
= 27 °C + 273.15 K
= 300.15 K
= 77 °C + 273.15 K
= 350.15 K
solution:
= ( × ) ÷
= (0.6 L × 350.15 K) ÷ 300.15 K
= 0.7 L
What would happen if two negative charges were next to each other? What if a positive charge and a negative change were next to each other?
Answer:
if two negative charges are next to each other they repel.
But if positive and negative charges are next to each other they attract.
Explanation:
Why because like changes repel and unlike charges attract
When 2 equal forces act on and object and the object generally doesn't move is
A. interia
B. unbalanced force
C. balanced force
D. speed
Answer:
a balanced force since the object isn't moving
hope this helped
Why cant chemical changes be reversed
Answer:
Throughout the explanation section, the reason behind the given statement is described.
Explanation:
The chemicals thus produced were indeed opposite or separate from the reaction mixture, this same reaction wouldn’t change when it's more balanced than some of the reactants.Another reason is that the development of advanced organisms, as well as chemical alterations, is irreversible throughout nature cant undo the chemical modifications.what adaptation help protect a cactus against herbivores
Answer:
spines
Cacti have spines, which are also called needles or thorns. Spines are modified leaves or leaves that have changed. Spines do not dry out. Spines deter herbivores from consuming this plant.
Explanation:
hope this helps...
Answer: Tunneling underground to offer protection from predators and extreme temperatures.
Explanation: A behavioral adaptation aimed at attracting a mate. A physical adaptation that allows birds to catch prey. Modified leaves that protect a cactus from herbivores.
What type of reaction is the following?
C2H 4(g) + 30 2(g) → 2 CO 2(g) + 2 H 20(g)
Answer:
combustion reaction
Explanation:
Cos Milky Said it. Milky Smart.
What is the speed of the green line if the distance it covered is 4 m in a time of one second
40m/s
4m/s
2m/s
Answer: 40m/s
Explanation:
______ have no definite shape, but definite volume
A. solids
B. liquids
C. gases
D. plasmas
Answer:
liquids
Explaination:
Help pleaseeeeeee
Using your knowledge of alpha beta and Gamma decay and your periodic table practice using your ideas by completing the following equations
Answer:
20. ²⁴¹₉₅Am —> ²³⁷₉₃Np + ⁴₂He
21. ⁴²₁₉K —> ⁰₋₁β + ⁴²₂₀Ca
Explanation:
20. ²⁴¹₉₅Am —> __ + ⁴₂He
Let ⁿₘX be the unknown.
Thus, the equation becomes:
²⁴¹₉₅Am —> ⁿₘX + ⁴₂He
Next, we shall determine n, m and X. This can be obtained as follow:
241 = n + 4
Collect like terms
n = 241 – 4
n = 237
95 = m + 2
Collect like terms
m = 95 – 2
m = 93
Thus,
ⁿₘX => ²³⁷₉₃X => ²³⁷₉₃Np
Therefore, the complete equation is:
²⁴¹₉₅Am —> ²³⁷₉₃Np + ⁴₂He
21. __ —> ⁰₋₁β + ⁴²₂₀Ca
Let ʸₓZ be the unknown.
Thus, the equation becomes:
ʸₓZ —> ⁰₋₁β + ⁴²₂₀Ca
Next, we shall determine y, x and Z. This can be obtained as follow:
y = 0 + 42
y = 42
x = –1 + 20
x = 19
Thus,
ʸₓZ => ⁴²₁₉Z => ⁴²₁₉K
Therefore, the complete equation is:
⁴²₁₉K —> ⁰₋₁β + ⁴²₂₀Ca
4. What is the volume, in liters, of a 3.00 mole sample of carbon dioxide at STP?
Answer:
One mole of ideal gas occupies 22.4L volume at STP
Explanation:
So., we treat carbon dioxide an ideal gas:
3 mol x 22.4L •Mol-¹ ≈? ?L
HELP PLS! I NEED TO GET THIS RIGHT! Curious Carl and his lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid. They observed bubbles being produced and did a variety of tests to identify the escaping gas; it proved to be hydrogen The reaction is represented by the following equation:
Mg + 2HCL -> MgCL2 + H2(g)
Assuming STP, how many moles of hydrogen gas did Carl and his partner collect if they collected 5.6L?
Answer:
0.25 mole of H₂
Explanation:
The equation for the reaction is given below:
Mg + 2HCl —> MgCl₂ + H₂
From the question given above, we were told that the reaction produced 5.6 L of H₂.
Thus, we can obtain obtain the number of mole of H₂ that occupied 5.6 L at STP as follow:
1 mole of H₂ occupied 22.4 L at STP.
Therefore, Xmol of H₂ will occupy 5.6 L at STP i.e
Xmol of H₂ = 5.6 / 22.4
Xmol of H₂ = 0.25 mole
Therefore, 0.25 mole of H₂ were obtained from the reaction.
What is the empirical formula of C20H40
Answer:
CH2
Explanation:
The empirical formula gives the lowest whole number ratio of the elements. In this case, both subscripts can be divided by 20, hence CH2.
why does ocean water found near the poles often have a higher leaves of salinity than ocean water found near the equator
The ocean water found near the poles has a higher level of salinity because the area of rain reduces as one moves toward the poles, and as a result of less rain and more sunshine, evaporation increases.
What is salinity?Salinity is the presence of salt in the water. Freshwater bodies have very less amount of salt, but ocean water has a large amount of salt dissolved in it.
Because cold polar air cools the water and decreases its temperature, raising its salinity, water close to the poles frequently has more salinity. When fresh water freezes out of seawater to form sea ice, the salinity of the remaining water likewise rises.
Therefore, as one travels toward the poles, the area of rain decreases, and as a result of less rain and more sunshine, evaporation increases, and the ocean water there has a higher level of salinity.
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Identify the type of each reaction in the copper cycle.
C u S O 4 ( a q ) + Z n ( s ) ⟶ Z n S O 4 ( a q ) + C u ( s ) Choose...
C u ( N O 3 ) 2 ( a q ) + 2 N a O H ( a q ) ⟶ C u ( O H ) 2 ( s ) + 2 N a N O 3 ( a q ) Choose...
C u O ( s ) + H 2 S O 4 ( a q ) ⟶ C u S O 4 ( a q ) + H 2 O ( l ) Choose...
C u ( s ) + 4 H N O 3 ( a q ) ⟶ C u ( N O 3 ) 2 ( a q ) + 2 N O 2 ( a q ) + 2 H 2 O ( l ) Choose...
C u ( O H ) 2 ( s ) Δ −→ C u O ( s ) + H 2 O ( g ) Choose...
Answer:
CuSO4 (aq) + Zn ( s ) ⟶ ZnSO4 (aq) + Cu (s): single displacement.
Cu(NO3)2(aq) + 2NaOH(aq) ⟶ Cu(OH)2(s) + 2NaNO3 (aq): Double displacement.
CuO(s) + H2SO4 (aq) ⟶ CuSO4 (aq) + H2O( l ): Double displacement.
Cu(s) + 4HNO3 (aq) ⟶ Cu(NO3)2 (aq) + 2NO2(aq) + 2H2O(l): Redox
Cu(OH)2 (s) Δ −→ CuO (s) + H2O(g): Decomposition.
Explanation:
Hello!
In this case, for the given chemical reactions, we obtain:
CuSO4 (aq) + Zn ( s ) ⟶ ZnSO4 (aq) + Cu (s): single displacement as the zinc metal is displacing copper in copper (II) sulfate.
Cu(NO3)2(aq) + 2NaOH(aq) ⟶ Cu(OH)2(s) + 2NaNO3 (aq): Double displacement as sodium is getting with nitrate and copper (II) with hydroxide.
CuO(s) + H2SO4 (aq) ⟶ CuSO4 (aq) + H2O( l ): Double displacement as the oxygen in the cupper (II) oxide turns out with the hydrogen and as a result, copper (II) sulfate is formed.
Cu(s) + 4HNO3 (aq) ⟶ Cu(NO3)2 (aq) + 2NO2(aq) + 2H2O(l): Redox since the copper joins NO3 but at the same time NO2 is released (Nitrogen goes from 5+ to 4+).
Cu(OH)2 (s) Δ −→ CuO (s) + H2O(g): Decomposition as copper (II) hydroxide is separated into copper (II) oxide and water.
Regards!
Chemical reactions are classified on the basis of the sort of change taking place in the reaction.
A chemical reaction involves the conversion of reactants into products. There are several kinds of chemical reactions depending on the nature of the change that is taking place. In the question, we have several are reactions from the copper cycle.
These copper reactions are classified as follows;
C u S O 4 ( a q ) + Z n ( s ) ⟶ Z n S O 4 - Singe replacementC u ( N O 3 ) 2 ( a q ) + 2 N a O H ( a q ) ⟶ C u ( O H ) 2 ( s ) + 2 N a N O 3 ( a q ) - NeutralizationC u O ( s ) + H 2 S O 4 ( a q ) ⟶ C u S O 4 ( a q ) + H 2 O ( l ) - NeutralizationC u ( s ) + 4 H N O 3 ( a q ) ⟶ C u ( N O 3 ) 2 ( a q ) + 2 N O 2 ( a q ) + 2 H 2 O ( l ) - Single replacementC u ( O H ) 2 ( s ) Δ −→ C u O ( s ) + H 2 O ( g ) - DecompositionLearn more: https://brainly.com/question/2510654
2 CO(g) + O2(g) + 2 CO2(g)
What type of reaction is shown above?
Answer:
I'm pretty sure its a combination reaction!!
Explanation:
they generally form between metals and non metals like that^
Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose and oxygen gas. Calculate the moles of carbon dioxide needed to produce of glucose. Be sure your answer has a unit symbol, if necessary, and round it to significant digits.
Answer:
0.57 moles of carbon dioxide are required to produce 0.095 moles of glucose
Note: The question is not complete. The complete question is given below:
Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose C6H12O6 and oxygen O2 gas. Calculate the moles of carbon dioxide needed to produce 0.095 mol of glucose. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits
Explanation:
Photosynthesis is a chemical reaction in which liquid water and carbon dioxide gas chemically react to form the simple sugar glucose in aqueous form and oxygen gas using energy derived from sunlight. The balanced equation of photosynthesis is given below:
6 CO₂ + 6 H₂O ----> C₆H₁₂O₆ + 6 O₂
From the equation above, 6moles of carbon dioxide gas, CO₂ reacts with 6 moles of water molecules to produce 1 mole of glucose and 6 moles of oxygen gas. Thus, 6 moles of carbon dioxide are required to produce 1 mole of glucose.
0.095 moles of glucose will require 0.095 moles of glucose * 6 moles of CO₂/ 1 mole of glucose
Moles of CO₂ required = 0.57 moles of CO₂
A 1.250-g sample of benzoic acid, C7H6O2, was placed in a combustion bomb. The bomb was filled with an excess of oxygen at high pressure, sealed, and immersed in a pail of water which served as a calorimeter. The heat capacity of the entire apparatus (bomb, pail, thermometer, and water) was found to be 10.134 kJ/K. The oxidation of the benzoic acid was triggered by passing an electric spark through the sample. After complete combustion, the thermometer immersed in the water registered a temperature 3.256 K greater than before the combustion. What is DEcombustion per mole of benzoic acid burned
Answer:
3224 kJ/mol
Explanation:
The combustion of benzoic acid occurs as follows:
C₇H₆O₂ + 13/2O₂ → 7CO₂ + 3H₂O + dE
The change in temperature in the reaction is the change due the energy released, that is:
3.256K * (10.134kJ / K) = 33.00kJ are released when 1.250g reacts
To find the heat released per mole we have to find the moles of benzoic acid:
Moles benzoic acid -Molar mass: 122.12g/mol-:
1.250g * (1mol / 122.12g) = 0.0102 moles
The dE combustion per mole of benzoic acid is:
33.00kJ / 0.0102moles =
3224 kJ/mol
If you were sitting near a gram of protactinium-234 and a gram of uranium-234, both solid materials, which would you consider more dangerous to you?
aswer: protactinium-234 is more dang erous than uranium
There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore protactinium-234 is more dangerous than uranium-234.
What is nuclear decay?Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. Protactinium-234 and uranium-234 are radioactive element.
If we were sitting near a gram of protactinium-234 and a gram of uranium-234, both solid materials then protactinium-234 is more dangerous than uranium-234. The half-life of protactinium-234 is smaller than that of uranium-234. So, protactinium-234 is more active than uranium-234 and hence more harmful than uranium-234.
Therefore, protactinium-234 is more dangerous than uranium-234.
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The rate at which the plates move apart ______
Answer:
one to two inches (three to five centimeters) per year.
Explanation:
Answer:
1 to 2 inches (3 to 5 centimeters) per year
Explanation:
It depends on what plates your talking about, but in general, they move apart anywhere from 1 to 2 inches (3 to 5 centimeters) per year.
Specifically, though, The Arctic Ridge has the slowest rate (less than 2.5 cm/yr), and the East Pacific Rise near Easter Island, in the South Pacific about 3,400 km west of Chile, has the fastest rate (more than 15 cm/yr).
A scientist has 8.5 g of silver nitrate and needs to prepare 1.5 L of a 0.020 M solution. Will there be enough silver nitrate? If so, how much silver nitrate will be leftover?
A) Nothing leftover
B) 3.4 g
C) 0.040 g
D) 2.3 g
Answer:
is
Explanation:
the fest president is
Chemistry help will be grateful thanks
Answer:
a = double displacement(iii)
b = Single displacement (ii)
c = Synthesis reaction (i)
d = decomposition reaction (iv)
Explanation:
It's not that hard!
PLEASE HELP ASAPPPPP BRAINLEST WILL BE GIVEN!!
Answer:
CuSO + NaOH --> CuOH₂ + Na₂SO₄
Explanation: