Answer:
I know some of them...
Explanation:
1. What was the purpose of the experiment?
Type your answer here: The purpose of this experiment is to show that a cell membrane is a type of barrier, and is permeable to some substances, but may not be permeable to all substances.
2. What were the independent, dependent, and control variables in your investigation? Describe the variables used in the part of the experiment with the eggs.
Type your answer here: Independent variable / Manipulated variable: Refers to all the variables in an experiment that provoke a response in another variable. This variable is modified during the experiment to analyze how another variable responds to it. The researcher wants to study how the changes in these variables affect the dependent variable. The researcher can change these variables to see what changes it implies in an object, process, trait, or anything that depends on them.
Dependent variable / Responding variable: Its response depends on any change in the independent variable. The dependent variable is the one that is being investigated, studied, and measured. It represents a quantity of something which value depends on how the independent variable is modified. It is usually identified by the letter Y. A change in the dependent variable might be proportional or inversely proportional to the change in the manipulated variable. In the exposed example, the dependent variable is the egg circumference.
Constants / Controlled variables: Refers to those variables in an experiment that are controlled and have no influence on the results. These variables do not affect the change in the dependent variable values. In the exposed example the use of the lid to seal the jar and the amount and concentration of vinegar might be considered as a controlled variable. These elements are used but do not provoke any change in the size of the egg.
thats it... CAN SOMEONE ANSWER THE OTHERS?! I NEED ITT
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).
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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Use the equation to answer the question
CH4 + 202 + CO2 + 2H2O
If you change the 2 in front of 20, to a 3, what will be the change in the results on the right side of the equation?
(1 point)
If you change the 2 in front of 2O, to a 3, the result of the right side of the equation is [tex]3CO_2+6H_2O[/tex]
Given the chemical equation expressed as:
[tex]CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O[/tex]
From the equation, we can see that 1 mole of methane reacts with 2 moles of oxygen to form 1 mole of carbon dioxide and 2 moles of water.
If the number of moles of oxygen is replaced with 3 moles, the correct equation will be expressed as:
[tex]3CH_4 + 2(3O_2) \rightarrow3CO2 + 6H2O[/tex]
This shows that if you change the 2 in front of 2O, to a 3, the result of the right side of the equation is [tex]3CO_2+6H_2O[/tex]
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Answer:
Simple Chemical Reactions Unit Test:
1. There is an extra O2 molecule left over.
2. Covalent bonds tend to be less polar than ionic bonds.
3. PH3
4. replacement
5. Potassium is more reactive than hydrogen.
6. Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.
7. H2SO4 + 8HI → H2S + 4I2 + 4H2O
8. 2, 1, 2
9. Nitrogen and oxygen have an electronegativity difference of 0.5, so the bond is polar covalent, with oxygen pulling the electrons toward it.
10. Sodium donates an electron to chlorine.
11. selenium (Se)
12. bond type
13. six
14. K
15. indicator
Have a great day! :)
1. Write the name for the following:
a. Phosphoric acid
b. Hydroiodic acid Nitrous acid
d . Hypochlorous acid
What mass in grams (theoretical yield) of hydrogen is produced by the reaction of 31.3 g of
magnesium with 2.12 g of water?
Mg(s) + 2H20 (1) ► Mg(OH)2 (s) + H2 (g)
O 0.474
O 0.0593
2.71
O 0.119
O 0.237
The percent yield is 74.4 %.
Fe₃O₄ + 4H₂ → 3Fe + 4H₂O
First, calculate the theoretical yield of H₂O.
Theor. yield =
0.112 g H
2
×
1 mol H
2
2.016 g H
2
×
4 mol H
2
O
4 mol H
2
×
18.02 g H
2
O
1 mol H
2
O
=
1.001 g H
2
O
Now calculate the percent yield.
% yield =
actual yield
theoretical yield
×
100
%
=
0.745 g
1.001 g
×
100
%
=
74.4
%
The mass in grams (theoretical yield) of hydrogen is produced is considered to be 0.119 g H2.
Calculation of the mass:
Since
Mass of Mg = 31.3 g
Mass of H2O = 2.12 g
First, we have to determine the mole
So,
Mole of Mg = mass of Mg / molar mass of Mg
= (31.3 g ) / (24.30 g/mol )
= 1.28 mole
And,
Mole of H2O = (2.12g ) / (18.01g /mol )
= 0.117 mole
As per the chemical reaction:
2 mole of H2O react with 1 mole of Mg
So, 0.117 mole of H2O will react with mole of Mg is
Now
= ( 1 mol Mg / 2 mol H2O ) * 0.117 mol H2O
= 0.058 mole of Mg
Now
1 mole of Mg produce , 1 mole of H2
So,
0.058 mole of Mg will produce 0.058 mole of H2
Now, determine the mass of H2
= Molar mass of H2 * mole of H2
= 2 * 0.058
= 0.116 g
= 0.119
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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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Which of these determines whether a fertilized egg develops into a toad, a snake, or a lizard?
A
the sex of the egg
B.
the age of the egg
С
the size of the egg
D
the genes of the ogg
Answer:
D
the genes of the egg determine
Which of the following is a correct representation of the isotope of Sulfur that has 18 neutrons?
a. Sulfur-18
b. Sulfur-16
c. Sulfur-36
d. Sulfur-33
Answer: sulfur-36
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.If 0.250 L of a 6.00 M HNO₃ solution is diluted to 2.00 L, what is the molarity of the new solution?
Taking into accoun the definitio of dilution, if 0.250 L of a 6.00 M HNO₃ solution is diluted to 2.00 L, the molarity of the new solution is 0.75 M.
First of all, you have to know that dilution is the reduction of concentration of a chemical substance in a solution and consists of lowering the amount of solute per unit volume of solution.
In other words, dilution is the procedure followed to prepare a less concentrated solution from a more concentrated one by simply adding more solvent to the solution.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeIn this case, you know:
Ci= 6 M Vi= 0.250 LCf= ?Vf= 2 LReplacing in the definition of dilution:
6 M × 0.250 L= Cf × 2 L
Solving:
[tex]Cf=\frac{6 Mx0.250 L}{2 L}[/tex]
Cf=0.75 M
In summary, if 0.250 L of a 6.00 M HNO₃ solution is diluted to 2.00 L, the molarity of the new solution is 0.75 M.
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Answer:
A. displacement) الازاحة
B. المسافة الفعلية للسيارة distance
You will calculate speed from graph (B) because it's the real distance, but (a) is Unreal distance
(II) speed equal distance / time
Speed =(250*1000/5*60*60).
=13.9888888m/s
1-Link the concepts of mole, molar mass, number of atoms, Avogadro’s
number and mass using a flowchart or mind map.
2-Rearrange the two equations to make each variable the focus (you will end up with three variations for each equation).
3- 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.
Answer:
hope its helpful. Good luck
Why does one electron in a potassium atom go into the fourth energy level instead of squeezing into the third energy level along with the eight already there?
Answer:
Explanation:
Because the third shell is full, the rule of quantum mechanics prevent the third level from holding more than eight electrons.
The third level cannot accommodate more than eight electrons due to the fullness of the third shell and the laws of quantum physics.
What are electrons?Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. Electrons are fundamental to many physical processes, including gravity, electromagnetic interactions, weak interactions, electricity, magnetism, chemistry, and thermal conductivity.
The laws of quantum physics are every moving particle, whether microscopic or macroscopic, has a wavelength according to De Broglie's equation. According to Heisenberg's Uncertainty Principle, it is impossible to measure a particle's position and momentum with the same level of accuracy.
Thus, the third level cannot accommodate more than eight electrons due to the fullness of the third shell and the laws of quantum physics.
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Nh3 metabolism - Urea cycle
Answer:
Ammonia is a toxic product of nitrogen metabolism which should be removed from our body.
The urea cycle or ornithine cycle converts excess ammonia into urea in the mitochondria of liver cells.
The urea forms, then enters the blood stream, is filtered by the kidneys and is ultimately excreted in the urine.
What are the energy transformations in a fossil fuels power plant?
chemical energy, electricity, mechanical electricity, light energy, thermal energy, kinetic energy
please put them in order.
Answer:
In a fossil fuel power plant the chemical energy stored in fossil fuels such as coal, fuel oil, natural gas or oil shale and oxygen of the air is converted successively into thermal energy, mechanical energy and, finally, electrical energy.
How do I find the average atomic weight of an element
Answer:
To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.
hope this helps <3
The word "atom" means:
the smallest imaginable thing
that which cannot be cut
everything that is not vacuum
that which cannot be seen
Answer:
the smallest particle of a chemical element that can exist.
Answer:
the smallest imaginable thing
Explanation:
The word "atom" means:
-the smallest imaginable thing
-that which cannot be cut
-everything that is not vacuum
-that which cannot be seen
Answer:
atoms as a source of nuclear energy.
noun: the atom
"the power of the atom
that which cannot be cut or indivisible
How does acid causes tooth decay ? How to prevent it ?
Explanation:
Foods and beverages that are high in acids wear away the enamel that protects your teeth, a process known as tooth erosion. This changes the appearance of your teeth and opens the door for bacteria that can cause cavities or infection.
You can reduce tooth erosion from what you eat and drink by following these tips: Wait an hour before you brush after eating acidic foods to give your saliva a chance to naturally wash away acids and re-harden your enamel. Limit – or avoid – acidic beverages like soft drinks. If you do indulge, use a straw.
hope this helps you.
Explanation:
Tooth decay starts when pH of the mouth is lower than 5.5 .This is caused when bacteria present in the mouth produce acid by degradation of sugar and food particles remaining in the mouth after eating.
To prevent this, we should clean the mouth after eating food. Using toothpaste, which are generally basic, for cleaning the teeth can neutralise the excess acid and prevent tooth decay.
0.1 points
Which orbital-filling diagram represents the ground state of oxygen?
O [He]
11
2s
2p
1
[He]
们个个
2p
2
2s
โต | 44 |
O
[He]
11 111
2p
3
2s
O
[He] ]
们
2s
N
4
2p
5
Previous
Answer:
Abe chutiye, Question sahi se likh laude phle
Give the gradient of a graph of p against T in terms of n, R and V.
Answer:3
Explanation:
What is the difference between the mass number and the atomic mass? Why is the
mass number a good approximation for atomic mass
Answer:
The mass number is the sum of the number of protons and neutrons in an atom. It is a whole number. The atomic mass is the average number of protons and neutrons for all natural isotopes of an element
An element's mass number (A) is the sum of the number of protons and the number of neutrons. ... This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Protons and neutrons both weigh about one atomic mass unit or amu
As a projectile falls vertically, it also travels horizontally. Is the distance which it falls
vertically effected by its horizontal velocity?
no
its kinematics
the acceleration due to gravity and the initial vertical velocity are the only thing that affects vertical distance
No, the distance which it falls vertically does not affect by its horizontal velocity.
Downward acceleration of a projectile is same as downward acceleration of a free falling body due to constant gravity. Horizontal velocity ([tex]V_h[/tex]) does not affect vertical velocity ([tex]V_v[/tex]). Gravity affects vertical velocity ([tex]V_v[/tex]).The horizontal velocity of a projectile is constant. There is a vertical acceleration caused by gravity; its value is 9.8 m/s², down, The vertical velocity of a projectile changes by 9.8 m/s each second, The horizontal motion of a projectile is independent of its vertical motion.Learn more:
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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 many grams are contained in a 0.183 mol sample of ammonium phosphate?
Molar mass of ( NH₄)₃PO₄ = 14.01×3 + 1.01×12 + 30.97 + 16.00×4 = 149.12 g/mol. Mass of 0.183 mol ...
A 0.183 mol sample of ammonium phosphate contains approximately 27.289 grams.
To calculate the number of grams in a given amount of a substance, we need to use its molar mass.
The chemical formula for ammonium phosphate is (NH₄)₃PO₄. To determine the molar mass, we sum up the atomic masses of all the atoms in the formula.
The atomic masses are as follows:
N = 14.007 g/mol
H = 1.008 g/mol
P = 30.974 g/mol
O = 15.999 g/mol
Now we can calculate the molar mass of ammonium phosphate:
Molar mass = (14.007 g/mol × 3) + (1.008 g/mol × 12) + (30.974 g/mol × 1) + (15.999 g/mol × 4)
Molar mass = 149.082 g/mol
Next, we can use the formula:
Mass = Number of moles × Molar mass
Mass = 0.183 mol × 149.082 g/mol
Mass ≈ 27.289 g
Therefore, a 0.183 mol sample of ammonium phosphate contains approximately 27.289 grams.
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what does effect on the density
Answer:
Volume
Explanation:
Density of a quantity of matter is its mass divided by its volume. External pressure pushes the atoms or molecules closer together and increased temperature usually expands the volume of the material, pushing the molecules apart.
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.
A prospector panning for gold (Au) in a river collects 15.00 g of pure gold. How many Au atoms are in this quantity of gold?
Answer:
There are 4.59*10^-24 atoms in 15.00 of pure gold.
Explanation:
Molar mass of gold is 196.996g/mol
[tex]\frac{15}{196.966} =0.076 mol[/tex]
0.076*(6.022*10^-23)=4.59*10^-24
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;
Answer:
C
Explanation:
3.5 x 10^15 atoms of sodium to moles of sodium
Answer:
Explanation:
· 3.5 x 10^15 atoms of sodium to moles of sodium. Answers: 1 Show answers : ) Another question on Chemistry. Chemistry, 21.06.2019 22:30. Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u. Answers: 1. Answer. Chemistry,