Answer:
mass of carbon = 0.438g
Explanation:
mass percentage = 0.00438%
Answer :
43.8% on edge
hope this helps and good luck!
What would be the mass of Iron(II) chloride obtained when 450g of Sodium Chloride is added to Iron(II) oxide?
Answer:
FeO(s)+2NaCL(aq)>FeCL2(aq)+Na2O(s)
2 moles of sodium chloride react with 1 mole of iron (II) oxide to give 1 mole of iron (II) chlorine
mole ratio NaCl :FeCl=2:1
mass of FeCl=0.5×450=225g
Explanation:
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What can you infer about the results of numerical models in 1966 for polar caps
made of water ice?
Answer:
that by living near the poles, people might be able to survive on Mars
Explanation:
Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule? monosaccharide disaccharide monomer starch
Explanation:
lactose is disaccharide
because it contains 1 monosaccharide galactose +
1 monosaccharide glucose
The correct answer to the question is: disaccharide
Monosaccharides are simple sugar which can not be hydrolysed into simpler or smaller molecules.
Disaccharides are sugars produced by the condensation of two monosaccharides with the elimination of a water molecule.
monosaccharide + monosaccharide <=> Disaccharide + waterA Monomer is a small molecule which can combine with other similar molecules to form a large molecule called polymer. Thus, a monomer of starch is simply a small molecule that combines together to form a polysaccharide called starch. The monomer of starch is glucose.
Glucose and galactose combined to form lactose i.e
Glucose + Galactose => LactoseThe above is simply a demonstration of how disaccharides are produced.
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A sample of gas (1.9 mol) is in a flask at 21 °C and 697 mmHg. The flask is opened and more gas is added to the flask. The new pressure is 795 mmHg and the temperature is now 26 °C. There are now __________ mol of gas in the flask.
Answer:
The new moles of the gas in the flask is 2.13 moles.
Explanation:
Given;
number of moles of gas, n = 1.9 mol
temperature of the gas, T = 21 °C = 21 + 273 = 294 K
pressure of gas, P = 697 mmHg
volume of gas, V = ?
Apply ideal gas law;
PV = nRT
Where;
R is gas constant, = 62.363 mmHg.L / mol. K
V = nRT / P
V = (1.9 x 62.363 x 294) / 697
V = 49.98 L
New pressure of the gas, P = 795 mmHg
New temperature of the gas, T = 26 °C = 273 + 26 = 299 K
New moles of the gas, n = ?
Volume of the gas is constant because volume of the flask is the same when more gas was added.
n = PV / RT
n = (795 x 49.98) / (62.363 x 299)
n = 2.13 moles
Therefore, the new moles of the gas in the flask is 2.13 moles.
18. An electric motor turns a belt that powers a pump. If this system is compared to the chemical reactions of the cell, which part represents
ATP?
the electric motor
the pump
the belt
Answer:
A. the electric motor
Explanation:
A cell is a biological molecule which is the basic and functional unit of life. Cells undergo series of processes to function appropriately. ATP is an acronym for adenosine triphosphate, which is the source of energy for various cell processes.
In the given mechanical system, the electric motor provides the energy required energy to drive the system. Therefore, the electric motor has the same major function of providing energy for the system as the ATP in a cell.
Which topic is commonly used to explain activation energy and how chemical reactio
reaction rate
collision theory
velocity distribution
spontaneous reaction
Answer:
The answer is collision theory
I hope this helps you.
What type of compound are carbon tetrachloride and boron trihydride?
Answer:
hydrocarbon
Explanation:
these are called hydrocarbons
1. Which of these items wastes sound energy?
-car radio
-alarm clock
-washing machine
-smartphone
Answer:
washing machine
Explanation:
the sound from a washing machine is not beneficial in any way
PLEASE HELP RIGHT AWAY!! THANK YOU :)
Copper turns a green-brown when it is exposed to oxygen in air. What chemical property of oxygen causes this effect?
A). its reactivity
B). its mass
C). its flammability
D). its volume
Answer:
The answer is option A.
its reactivity
I hope this helps you.
Answer:
A) Reactivity
Explanation:
Reactivity is one of the characteristics of a chemical property. The copper that turned color due to air, has a different chemical composition.
It wouldn't be flammability - even though it is a chemical property, but nothing is burning.
All the other answer choises: mass and volume are physical properties. Basically the PHYSICAL characteristics which doesn't change the composition.
Hope this helps!
CALCULATE THE VOLUME OF 16 g OF OXYGEN GAS AT S.T.P?
Answer:
To calculate the volume we must first find the number of moles
Number of moles (n ) = mass / Molar mass (M)
Since oxygen is diatomic
M of oxygen = 16 × 2 = 32g/mol
n = 16 / 32 = 0.5mol
Next we use the formula
V = n × V(dm³)
where V is the volume
V(dm³) is the volume of 1 mole of a substance at s.t.p which is
22.4dm³
Volume of oxygen gas at s.t.p is
0.5 × 22.4dm³
= 11.20dm³
Hope this helps you
what causes convection in currents in the air? a. the revolution of the earth around the sun. b. the rotation of the earth around itself. c. the heat on the surface of the earth. d. conversion of solid-gas directly
Answer:
THE HEAT ON THE SURFACE OF THE EARTH
Explanation:
Answer:
Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat.
Explanation:
DETAILED Description on the applications of Nanochemistry.... about 100 words for each( note: has to be detailed)
Answer:
Explanation:
Nanochemistry is a branch of nanoscience, deals with the chemical applications of nanomaterials in nanotechnology.
Nanochemistry involves the study of the synthesis and characterisation of materials of nanoscale size.
A group of students conducts an experiment to test the amount of sugar that can be dissolved in water at 50°F, 100°F, and 200°F.
Which suggestion will help increase confidence in the result?
A. Michael suggests timing each addition of sugar
B. Ali suggests using her hand to verify the temperature of the water
C. Joel suggests testing salt along with sugar to see if they dissolve at different speeds
D. Zander suggests that each student complete an experiment individually and compare results
Answer:
A. Michael suggests timing each addition of sugar
Explanation:
The experiment is about amount of sugar dissolved at different temperatures. The suggestion of Michael is best suited to record the timing of each addition of sugar. This will enable to record the timing of sugar added in the water and amount of sugar dissolved at the specified temperature.
Which could cause topsoil to be lost? a) wind and water erosion b)lack of use c)compaction d)desertification
Answer:
Which could cause topsoil to be lost?
a) wind and water erosion
Explanation:
A natural and common cause of soil erosion is Water. Water can carry away tiny soil particles.
Raindrops can impact the soil surface and can break down the aggregates in soil and scatter them.
Water runoff is another cause of soil erosion and this occurs when water on a slope isn’t absorbed into the soil or becomes trapped on the surface.
Loose particles can be picked up and carried away by the wind.
Soil surfaces can be worn down when struck by airborne particles carried by the wind.
B. Lack of use of the top soil rather helps the top soil to regain its nutrients.
c. Compaction can the topsoil from losing particles, since there are no loose particles to be picked up.
D. Desertification mostly causes the soil to lose its nutrients, not go away completely.
Hope this helps!
Answer:
The correct answer is A
Explanation:
A metal strip reacts slowly when placed in a light blue solution, and much faster when placed in a dark blue solution at the same temperature. Using the collision theory, explain this phenomenon.
Answer:
Increase in the color intensity and hence the concentration of the reacting species increases the rate of the reaction according to collision theory
Explanation:
The given parameters are;
Rate of reaction of metal strip in light blue solution lesser than rate of reaction of the metal strip in dark blue solution
Therefore, the color of the solution derives from the concentration of the reacting species involved in the reaction.
The increase in the darkness of the blue solution stems from the increase in the concentration of the reacting species which according to collision theory increases the fraction of the effective collisions, thereby increasing the reaction rate.
HURRY I'M ON A TIMER
A stovetop bumer on medium reaches 95°C. Which other object will receive a flow of heat directly from the burner?
the surrounding air
a burner at the same temperature
a pan heated to 100°C
hotter water inside a pan
Answer:the surrounding air
Explanation:
A burner at the sanem temperature would not receive a flow of heat, a pan heated to 100 degrees will transfer heat to the stovetop, and hotter water inside a pan will not take the heat either because it is hotter. the surrounding air is colder and will take heat from the burner
Answer:
surrounding air
Explanation:
taking test too
Production of synthetic fibers helps in the conservation of forests comment
Answer:
Explanation:
Synthetic fibres are made using chemicals. Hence they do not require any forest resources like wood. This helps in saving the trees from cutting down. So the production of synthetic fibers helps in the conservation of forests.
Natural fibres on the other hand require forest products like wood for its manufacture.
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Answer:
yes, they do help in conservating the forest resources.
Explanation: This is because synthetic fibers like rayon, nylon etc are made from petrochemicals which helps to substitute usage of natural resources like cotton etc. and these synthetic fibers are more durable than natural fibers, which adds to their usage and in turn, helps to conserve forest resources.
How many grams of AuCl2, if the compound has 6.3 x10^23 atoms of Cl?
Answer:
Total mass = 93.21 gram (Approx)
Step-by-step explanation:
Given:
Atoms of Cl = 6.3 × 10²³
Find:
Amount of AuCl₂
Computation:
Molecules of AuCl₂ = 6.3 × 10²³ / 2 = 3.15 × 10²³
1 mol of AuCl₂ = 6.022 × 10²³ molecules
Number of mol = 3.15 × 10²³ / 6.022 × 10²³
Number of mol = 0.523 mol
So,
Molar mass of AuCl₂ = 267.87 g/mol
Total mass = 0.348 mol × 267.87 g/mol
Total mass = 93.21 gram (Approx)
an element x atomic number 16 reacts with an element Y atomic number 20 to form a compound
i) position of the elements in the modern periodic table
ii) what type of bond will be formed between them ? give reason
iii) write the chemical formula of the compound
Answer:
Element x has an atomic number of 16, it is sulphur.
Element Y has an atomic number of 20, it is calcium.
i) Sulphur is in Group VI, period 3 in the modern periodic table,
whereas calcium is in Group II, period 4 of the modern periodic table.
ii) Ionic bonds will form between them. This is because metals and non-metals (Cacium and sulphur) usually form ionic compounds where between the ions are held by ionic bonds (which are transferred electrons so that both elements can attain a stable status).
iii) CaS
each Calcium atom can lose 2 electrons to attain 8 outermost shell electrons, while each sulphur atom can gain the 2 electrons to attain 8 outermost shell electrons, where they will most be stable (octet). Hence, the atomic ratio of Ca and S is 1:1.
i) The element with atomic number 16 is sulfur present in group 16 and period 3rd and the element with atomic number 20 is calcium present in group 2 and period 4th.
ii) The ionic bond formed between them.
ii) The chemical formula of the compound will be CaS.
What are ionic compounds?Ionic compounds can be described as crystalline solids formed by closely packed ions of opposite charge. An Ionic compound is generally formed when metal reacts with non-metal.
In ionic compounds, the ions are commonly held together by ionic bonds. The ions are formed by gaining or losing electrons in order to achieve their nearest noble gas configuration.
In a reaction, the metals usually lose electrons to complete their octet while non-metals will gain electrons to complete their octet.
The given element calcium is a metal with a valency of +2 and sulfur is a non metal with a valency of -2. Therefore, they form an ionic compound with the chemical formula CaS.
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What volume of Co2 (carbon (iv) oxide)
will be produced when 10g of Na2Co3
(sodium trioxocarbonate (iv) reacted
with excess Hcl (Hydrogen Chloride) at
STP(Na=23, C=12, O=16)
Answer:
2.1056L or 2105.6mL
Explanation:
We'll begin by calculating the number of mole in 10g of Na2CO3. This can be obtained as follow:
Molar mass of Na2CO3 = (23x2) + 12 + (16x3) = 106g/mol
Mass of Na2CO3 = 10g
Mole of Na2CO3 =.?
Mole = mass /molar mass
Mole of Na2CO3 = 10/106
Mole of Na2CO3 = 0.094 mole
Next, we shall determine the number of mole CO2 produced by the reaction of 0.094 mole of Na2CO3. This is illustrated below:
Na2CO3 + 2HCl —> 2NaCl + H2O + CO2
From the balanced equation above,
1 mole of Na2CO3 reacted to produce 1 mole of CO2.
Therefore, 0.094 mole of Na2CO3 will also react to 0.094 mole of CO2.
Next, we shall determine the volume occupied by 0.094 mole of CO2 at STP. This is illustrated below:
1 mole of a gas occupy 22.4L at STP. This implies that 1 mole CO2 occupies 22.4L at STP.
Now, if 1 mole of CO2 occupy 22.4L at STP, then, 0.094 mole of CO2 will occupy = 0.094 x 22.4 = 2.1056L
Therefore, the volume of CO2 produced is 2.1056L or 2105.6mL
why does bromine not react with sulphur?
Answer:
The thermodynamic parameter which is of significance in this case is the 'Reduction Potential' for molecular bromine which is ~ +1.1 v vs N.H.E. In other words, it is a strong oxidizing agent. The bromine will oxidize sulfur compounds in which the valence of sulfur is lower than six to sulfate.
There are many possible reactions. Here is one possible example:
Na2 S2O3 + 4Br2 + 5 H2O = 2NaHSO4 + 8 HBr
Answer:
because bromine doesn't have a reaction channel on Yootube.
Explanation:
Speaks for itself.
What was the plum-pudding atomic model? A. A description of atoms being balls of positive charge with electrons scattered outside B. A description of electrons orbiting the nucleus of the atom C. A description of electrons scattered inside the atom D. A description of negative charges being suspended between balls of positive charge
Answer:
C
Explanation:
plum- pudding atomic model is an atom that had a positively charged medium, or space, with negatively charged electrons inside the medium.
The correct answer is (A) A description of atoms being balls of positive charge with electrons scattered outside.
What is plum pudding atomic model? The plum pudding atomic model was proposed by JJ Thomson.This atomic model had electrons embedded with positive charge.The plums were negatively charged electrons the pudding were the positively-charged protons. Why other options are incorrect?
Option (A) is correct because the atom was a sphere of positive charge with negatively charged electrons scattered around the atom like plums in a pudding.
So , Rest options that are B , C and D are incorrect.
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What is cationic and anionic polymers?
Answer:
Explanation:
Anionic polymerization and cationic polymerization are two types of chain growth polymerization reactions which are used to synthesize various types of polymers. Both these reactions have the same reaction mechanism, but the reaction initiator is different. Anionic polymerization reactions are initiated by an active anionic species, whereas the cationic polymerization reactions are initiated by an active cationic species.
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What is the name of the Group 17 elements ?
Answer:
Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
The name of the Group 17 elements is called halogens
What is the name of group 17 elements?The group 17 elements are very reactive elements. Members of this group include:
Fluorine (F)Chlorine (Cl)Bromine (Br)Iodine (I)Astatine (At)The group 17 element are known to produce salts as they react with metals. Hence, they are called halogens
The group 17 elements are have 7 valence electrons and they required one electron to attain the stable octet configuration of the noble gas family.
From the above, we can see that the name of group 17 elements is halogens
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The production of water proceeds according to the following equation.
2H2(g) + O2(g) → 2H2O(g)
Which describes a way to speed up the collisions between hydrogen and oxygen molecule:
Use a less-intense source of heat on the reactants.
Maintain the same temperature of the reactants.
Place the reactants in a smaller container.
Reduce the concentration of the reactants.
Answer:
Place the reactants in a smaller container.
Explanation:
If you were to reduce the source of heat, the hydrogen and oxygen molecules would lose their kinetic energy, resulting in less collisions.
_______________________________________________________
Maintaining the same temperature of the reactants, the speed would neither increase nor decrease as temperature is directly proportional to the kinetic energy of the molecules, which in turn is directly proportional to the number of collisions. However, placing the reactants in a smaller container would result in less volume, and hence the molecules would collide with one another more often!
Hope that helps!
The primary requirement of a reaction to occur is that the reactant particles must collide and interact with each other in some way. Place the reactants in a smaller container which speed up the collisions between hydrogen and oxygen molecule. The correct option is C.
What is collision theory?The collision theory states that the rate of a chemical reaction is proportional to the number of collisions between the reactant molecules. The more often reactant molecules collide, the more often they react with one another and faster will be the reaction rate.
If we reduce the source of heat, the hydrogen and oxygen molecules would lose their kinetic energy, resulting in less collisions. The temperature is directly proportional to the kinetic energy of the molecules, which in turn is directly proportional to the number of collisions.
If we place the reactants in a smaller container it would result in less volume, and hence the molecules would collide with one another more often.
Thus the correct option is C.
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The atomic size of sodium is smaller than that of the sodium why?
HELP PLEASEE 100 POINTS
The Quiver tree grows in Southern Africa. Which of the following plant adaptations is likely to prevent these trees from dying out due to rising desert temperatures?
O Releasing a black powder onto their trunk to absorb more heat from sunlight
O Shifting their growing range towards the equator
Ability to store water in leafy structures to prevent excess evaporation
O Limiting seed dispersal to nearby locations
PLEASE HELP 100 POINTS !!
Answer:
Shifting their growing range towards the equator
Explanation:
Maybe will be like that
Answer:
Ability to store water in leafy structures to prevent excess evaporation.
Explanation:
The reason why plants die in hot temperature is the excess evaporation of water, so to prevent the excess evaporation of water, the plants get adaptive to store water in their leaves.
Hope it helps.
Name each of the following binary compounds or ionic compounds with polyatomic ions: 1. LiBr 2. Cal2 3. Al203 4. Mg3N2 5. FeCl2 6. FeCl3 7. Cu3N2 8. Ni2O3 9. Al(SO4)3 10. Ca3(PO4)2 11. Fe(OH)2 12. (NH4)2S 13. Na2O 14. NH3 15. SO42-
Answer:
Explanation:
1. LiBr - Lithium bromide
2. Cal₂ - Calcium iodide
3. Al₂0₃ - Aluminium oxide
4. Mg₃N₂ - Magnesium nitride
5. FeCl₂ Ferrous chloride [ Iron(II) chloride ]
6. FeCl₃ Ferric chloride [ Iron(III) chloride ]
7. Cu₃N₂ Copper nitride
8. Ni₂O₃ Nickel(III) oxide
9. Al(SO4)₃ Aluminium sulphate
10. Ca₃(PO4)₂ Copper phosphate
11. Fe(OH)₂ Iron (II) hydroxide
12. (NH4)₂S Ammonium sulphide
13. Na₂O Sodium oxide
14. NH₃ Ammonia
15. SO₄²⁻ Sulphate ion
how many atoms altogether make up one molecule of glucose
Answer:
24 atoms makes altogether a molecule of glucose
. The four metals, Strontium(Sr), Francium (Fr), Yttrium (Y), and Europium (Eu), in separate experiments, are dipped in aqueous solutions of SrNO3, FrNO3, Y(NO3)3, and Eu(NO3)2. The following results are obtained: 1. Yttrium metal does not react with any of the solutions 2. Strontium metal reacts with all of the other metals solutions 3. Francium metal reacts in a solution of Eu(NO3)2 a) List the four oxidizing agents in order from strongest to weakest by creating a small reduction table. Explain your reasoning below b) List the four reducing agents in order from strongest to weakest
Answer:
a) Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺
b) Sr > Fr > Eu > Y
Explanation:
Y is the least reactive metal because it does not react with any of the other solutions.
Sr is the most reactive metal because it reacts with all of the other solutions.
Sr + 2Fr⁺ ⟶Sr²⁺ + 2Fr
3Sr + 2Y³⁺ ⟶ 2Sr²⁺ + 2Y
Sr + Eu²⁺ ⟶ Sr²⁺ + Eu
Fr is more reactive than Eu because it reacts with Eu(NO₃)₂.
2Fr + Eu²⁺ ⟶ 2Fr⁺ + Eu
The order of reactivity is
Sr > Fr > Eu > Y
b) Reducing agents
In each of the above reactions. the more reactive metal is acting as a reducing agent — it is donating electrons to the cation of the other metal.
Thus, the order of activity of reducing agents is
Sr > Fr > Eu > Y
a) Oxidizing agents
The metal cations are the oxidizing agents.
The order of reactivity of the oxidizing agents is the reverse order of the reducing agents
Y³⁺ > Eu²⁺ > Fr⁺ > Sr²⁺
c) Standard reduction potential table
See the image below.