Plant cell Organelles
Cell wall : The outer most covering of the plant cell is the cell wall. The main constituent of it is cellulose. The main functions of the cell wall are, to maintain the shape of the cell, support and protection of the cell.Chloroplasts : Chloroplasts are organelles that conduct photosynthesis, where the photosynthetic pigment chlorophyll captures the energy from sunlight, converts it, and stores it in the energy-storage molecules ATP and NADPH while freeing oxygen from water in plant and algal cells.How much heat, in kilocalories, is produced when 4.20 g of ethanol reacts with O2 gas?
The reaction as shown is a combustion reaction. 29.8 kCal of heat is produced when 4.20 g of ethanol reacts with O2 gas.
The equation of this reaction is shown below;
C2H5OH + 3O2 →2CO2(g)+3H2O(l)+327 kcal
From the reaction equation, we can see that 1 mole of ethanol produces 327 kcal of heat.
Now, we have to find the number of moles in 4.20 g of ethanol as follows;
Number of moles = mass/molar mass = 4.20 g/46 g/mol = 0.091 moles
If 1 mole of ethanol yields 327 kcal of heat
0.091 moles of ethanol yields 0.091 moles × 327 kcal / 1 mole
= 29.8 kCal
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What state of matter is water in a lake? Gas Liquid Solid Transitive
Answer:
Liquid
Explanation:
Solid would be made out of ice.
Explanation:
soild would be ice gas would be steam or evapiration
How does matter and energy cycle through an ecosystem?
a. Cellular respiration alone
b. The atmosphere
c. Photosynthesis and cellular respiration
d. Photosynthesis alone
Please help D;
can someone help me pls
Answer:
I dont understand what the question means
Explanation:
A liquid has a density of 270 g/L. What would its density be in kilograms per gallon?
Answer:g
Explanation:
g
Answer please I give lots of points
Answer:
4
Explanation:
30 points for you if anyone answers with an explained answer ill mark you Brainliest!
Answer:
g/kg
Explanation:
they are both a unit of weight
notice how the others have a unit of weight and then measurement? g/kg are two units of weight
PLEASE GIVE BRAINLIESTAnswer:
Grams/kg
Explanation:
a solid is 5 cm tall 3 cm wide and 2 cm stick it has a mass of 129 g what is its density
Problem:
a solid is 5 cm tall 3 cm wide and 2 cm stick it has a mass of 129 g what is its density
Answer:
[tex]\sf{4.3g/cm³}[/tex]
Solution:
To achieve a volume of 30, multiply 5,3, and 2 together. Density is defined as the ratio of mass to volume, thus divide 129 by 30. You'd obtain a mass of 4.3.
Therefore 4.3 g/cm³ would be the answer.
- Freon-12 CF-a, is commonly used as the refrigerant in cen-
sal home air conditioners. The system is initially charged to a
pressure of 4.8 atm. Express this pressure in each of the fol-
lowing units (I at =
14.7 psi).
A.mm Hg
B. Torr
c. Pa
d psi
Answer:
Step 1 of 3
To determine pressures in each of the different units, you need the below relations:
(a) To convert pressure in atmospheres to mm Hg, use the relation given by,
We have, initial pressure charged to the system is 4.8 atm. So, the pressure in mm Hg is So, the pressure in mm Hg is.Freon-12 is used as a refrigerant in central home air conditioners. The rate of effusion of Freon-12 to Freon-11 (molar mass = 137.4 g/mol) is 1.07:1. The formula of Freon-12 is one of the following:
\mathrm { CF } _ { 4 } , \mathrm { CF } _ { 3 } \mathrm { Cl }, \mathrm { CF } _ { 2 } \mathrm { Cl } _ { 2 } , \mathrm { CFCl } _ { 3 } , \text { or } \mathrm { CCl } _ { 4 }. CF 4 ,CF 3Cl,CF 2 Cl 2 ,CFCl 3 , or CCl 4
Explanation:
The system is initially charged to a pressure of 4.8 atm. 4.8 atm in mm Hg is 3648 mm Hg, 4.8 atm in torr is 3648 Torr, 4.8 atm in Pa is 486360Pa and 4.8 atm in Psi is 70.56 psi.
The force applied to a unit area of a surface is described by pressure, a fundamental concept in physics and chemistry. It describes how much force is distributed over a certain area.
A. mm Hg (millimeters of mercury):
1 atm = 760 mm Hg
So, 4.8 atm = 4.8 ×760 mm Hg
≈ 3648 mm Hg
B. Torr:
1 atm = 760 Torr
So, 4.8 atm = 4.8 ×760 Torr
= 3648 Torr
C. Pa (Pascals):
1 atm = 101325 Pa
So, 4.8 atm = 4.8 × 101325 Pa
≈ 486360Pa
D. psi (pounds per square inch):
Given: 1 atm = 14.7 psi
So, 4.8 atm = 4.8 ×14.7 psi
≈ 70.56 psi
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Give the gradient of a graph of p against T in terms of n, R and V.
Answer:3
Explanation:
What occurs when an insoluble substance is mixed with water?
It will sink to the bottom and then dissolve.
O It will instantly dissolve in the water.
O It will dissolve after a lot of stirring and mixing.
It will remain solid and not
Answer: C
Explanation:
When an insoluble substance is mixed with water, the substance will sink to the will remain solid and not dissolve (option D).
What is insolubility?Insolubility is the quality of being insoluble i.e. cannot dissolve in a solvent.
Ideally, a solid substance called a solute mixes with solvent to form a solution. This occurs when the solute is soluble i.e. can dissolve in the solvent.
However, in a case whereby an insoluble substance is mixed with water, the substance will sink to the will remain solid and not dissolve.
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i will give brainliest pls help
what chemical property is used when cooking
Answer:
Chemical properties of food are those properties that cannot be measured without altering the chemical composition of the food material.
Explanation:
Answer:
The property of chemical reactive foods is used.Let's take an example of cooking an egg.Cooking an egg is a chemical reaction because you can't change cooked egg into raw or its previous state.There are two types of reactions
Physical reactionChemical reactionSugar dissolves in water. Which statement best describes what is happening? (1 point) Sugar stays together but in a liquid form that can no longer be seen in the water. Sugar stays together but in a liquid form that can no longer be seen in the water. Sugar slowly melts, turning from a solid to a liquid and combining with the water. Sugar slowly melts, turning from a solid to a liquid and combining with the water. The water molecules in sugar will separate from each other and combine with the water, releasing the sweetness into the water. The water molecules in sugar will separate from each other and combine with the water, releasing the sweetness into the water. A large collection of sugar molecules break into individual molecules and disperse in the water.
How many grams of titanium metal can be produced if 12.5 of hydrogen gas reacts with excess titanium(IV) bromide(TiBr4)?
A. 6.25g
B. 148g
C. 47.9
D. 6.20g
The mass of titanium metal formed is 148g.
The equation of the reaction is;
TiBr4(s) + 2H2(g) ------>Ti(s) + 4HBr(g)
The number of moles of hydrogen gas = 12.5 g/2.00 g/mol = 6.25 moles of hydrogen gas
If 2 moles of hydrogen gas yields 1 mole of titanium metal
6.25 moles of hydrogen gas yields 6.25 moles × 1 mole/2 moles = 3.1 moles of titanium metal
Mass of titanium metal = 3.1 moles of titanium metal × 47.8 g/mol = 148g
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When cleaning a buret
Answer:
1. Rinse with distilled water.
2. Avoid dropping it
3. Use a stopper and fill with water and shake
4. Dry
Vehicles that are propelled by a conventional gasoline engine in tandem with an
electric motor powered by batteries are called hybridelectric vehicles (HIVs).
A.True
B.False
write all of the allowed sét of quantum numbers for a 3p orbital
Answer:
Which of the following is a possible set of quantum numbers for a 3p orbital?
Since you are dealing with a 3p-orbital, your principal and angular momentum quantum numbers will be n=3 and l=1 .
carbon dioxide+water+Adenosine Triphosphate
how do the methods of scientist lead to knowlodge
How many minutes will it take for a car to Travel 3.5 miles. If it is traveling 25km/h? (1 mile = 1.609 km) ?
Answer:
It will take the car 13.5 minutes to travel 3.5 miles.
How can you tell baking a cake produces a chemical change?
Answer: see below
Explanation:
1. Change in smell
2. Heat given off
3. New substance (cake) cannot be separated into the original ingredients
For detailed, step-by-step explanations you can visit my fiverr account: kesja_
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Connect and Apply scientific knowledge to explain the following situations:
a. Link the concepts of mole, molar mass, number of atoms, Avogadro’s
number and mass using a flowchart or mind map.
b. Rearrange the two equations to make each variable the focus (you will end up with three variations for each equation).
c. Record the equations for number of moles and number of particles (and
each equation triangle) - Annotate each symbol with what it means and definition and the units.
d. Explain mole concept using any real life example
Answer:
b.Rearrange the two equations to make each variable the focus (you will end up with three variations for each equation).
100 POINTS!!!!!!! FAST PLEASE
A
Find a room that can be made completely dark. In the room, tape a piece of white paper on the wall at eye level. Turn on the flashlight, and turn off the lights in the room. Observe what the light looks like as it hits the white paper. Next, place the clear plastic in front of the flashlight. Does the plastic affect how the light hits the paper on the wall? If so, how?
B
Now place the waxed paper in front of the flashlight instead of the plastic. Does the waxed paper affect how the light hits the paper on the wall? Explain your response.
Answer:Plastic wrap is transparent and so nearly all light passes through easily ,
Wax Paper is translucent and so light is blurred or scattered .
Explanation:
What is Reflection ?
Reflection of light occurs when light hits a smooth surface that does not absorb any of the light but instead bounces it back off the surface.
A mirror is flat, smooth, and polished. When light hits a mirror it is not absorbed but is reflected off at a very predictable angle.
The angle that the light hits the mirror is called the angle of incidence.
The angle of light that bounces off the mirror is called the angle of reflection.
The Law of Reflection states that the angle of incidence is equal to the angle of reflection.
Plastic wrap is transparent and so nearly all light passes through easily ,
Wax Paper is translucent and so light is blurred or scattered .
If 4.40 g of glucose are burned in a bomb calorimeter, the temperature of the 800 g of water in the calorimeter increases from 15.0∘C to 18.7∘C. If the heat capacity of the calorimeter is 550J∘C, what is the value of q for the combustion of the glucose sample?
Answer:
-14.4kJ
Explanation:
The value of heat energy in a bomb calorimeter with a glucose sample of mass 4.40 g if changes temperature from 15 to 18 degree celsius is 16369.54 kJ.
What is calorimeter?Calorimeter is a thermal device used to determine the heat evolved or absorbed from a reaction. From this we can also calculate the enthalpy change.
If the enthalpy is negative, then the reaction is endothermic. If enthalpy change is positive, then the reaction is exothermic. The equation for finding the heat energy q from the mass, temperature change and heat capacity of calorimeter is given below:
q = mc ΔT.
It is given that the total mass is 804.40 g and heat capacity of the calorimeter is 550 J/°C g, then the heat energy q is calculated as follows:
q = 804.40 g × 550 J/°Cg (18.7 °C - 15 °C)
= 16369540J
= 16369.54 KJ.
Hence, the value of q for the bomb calorimeter is 16369.54 KJ.
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Gravity creates stars, planets, or black holes through a process called __________?
Question 2 options:
spiral matter
accretion
intertwining
fusion
Answer:
Accretion
the process of growth or increase, typically by the gradual accumulation of additional layers or matter.
Caffeine is used commercially as a
Which hydroxide is a weak base?
RbOH
CsOH
Sr(OH)2
NaOH
None of these choices are weak bases.
Answer:
NH4OH
Explanation:
NH4OH is a weak base because it partially dissociates into NH + and OH− ions in aqueous solutions and the amount of OH− ions produced is low.
Which is the best description of a molecule?
Answer:
a molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms
Answer:
: A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.
Explanation:
i hope its right
PLEASE HELP ME WITH THISSSS!!! Okay
Answer:
1. follow
2. corellation
3.does
Explanation:
i dont know for sure but I think those are the answers cause the two lines look around the same.
The process of splitting an atom into two nuclei with smaller masses is called _____.
a. nuclear fusion
b. transmutation
c. chain reaction
d. nuclear fission
Answer:
D nuclear fission, the process where the nucleus of an atom is split into two or more smaller nuclei. Nuclear fusion is the reaction of the combination of nuclei.