Answer:
Strong nuclear force
Which sublevel contains valance electrons in an atom of magnesium (mg)?
A. 2s
B. 2p
C. 3s
D. 3p
What are the two functional group present in the molecule
Answer:
carboxyl group (COOH) and amines
Explanation:
The two functional group present in the shown molecule are carboxylic acid group and amine group.
What are functional groups?Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.
The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.
Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.
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QUESTION 5
5.1
Sulphur reacts with iron according to the equation:
Fe +S → FeS
The reaction requires large amount of heat
When 2,5g sulphur and 5 g iron were placed in a test tube and heated strongly, a
reaction took place to produce a greyish black solid. After the reaction was completed
the solid was found to be magnetic.
5.1.1 Why was this greyish black solid magnetic?
5.1.2 Calculate the mass of Fos produced
Answer:
The black solid is magnetic due to the special property of iron called ferromagnetism
6.9 g
Explanation:
The substance FeS is magnetic despite of the fact Fe^2+ is spin paired due to the special magnetic property of iron called ferromagnetism.
The equation of the reaction is;
Fe(s) + S(s) ----> FeS(s)
Number of moles of Fe = 5g/56g/mol = 0.089 moles
Since the reaction is 1:1, 0.089 moles of FeS is formed
For Sulphur;
Number of moles of sulphur = 2.5g/32 g/mol = 0.078 moles
Since the reaction is 1:1, 0.078 moles of FeS is formed
Hence sulphur is the limiting reactant.
So, mass of FeS produced = 0.078 × 87.91 g/mol = 6.9 g
Dos moléculas de Clorato de Potasio en estado sólido, al aplicarle calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso ¿como se representan?
Answer:
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
Explanation:
Una ecuación de reacción química es una representación simbólica de lo que sucede en un recipiente de reacción.
Al escribir la ecuación de reacción química para una reacción particular, se utilizan los símbolos químicos de todas las especies involucradas.
Por la reacción. en el cual dos moléculas de Clorato de Potasio en estado sólido, al aplicar calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso, la ecuación de reacción se escribe así;
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
La regla para escribir ecuaciones de reacción química balanceada es que el número de átomos de cada elemento en el lado derecho de la ecuación de reacción debe ser el mismo que el número b de átomos del mismo elemento en el lado izquierdo de la ecuación de reacción.
Si realizamos un conteo de átomos simple en ambos lados de la ecuación de reacción, la regla se cumple
1. Ecosystems are composed of biotic and abiotic factors. Which of the following
represent only an abiotic factor in an ecosystem that could have an effect on
the ecosystem?
a. rivers with more dams
b. wood being taken for manufacturing
c. waste not being used by fungi
d. decomposers only taking nutrients from plants
Answer:
wood being taken for manufacturing
A sample of oxygen gas has volume 150.0 mL, at 0.947 atm, what will be the volume of the gas at 750.12 mm of Hg if temperature remain constant.
Answer:
143.9 mL
Explanation:
Applying,
PV = P'V'................. Equation 1
Where P = Initial pressure, V = Initial Volume, P' = Final pressure, V' = Final volume.
Make V' The subject of equation 1
V' = PV/P'............. Equation 2
From the question,
Given: P = 0.947 atm, V = 150 mL, P' = 750.12 mm of Hg = (750.12/760) = 0.987 atm,
Substitute these values into equation 2
V' = (0.947×150)/0.987
V' = 143.9 mL
Timed PLS help
Given the following reaction:
2 Al + 2 KOH + 4 H2SO4 + 22 H2O --> 3 H2 + 2KAl(SO4)2•12H2O
If you start with 8.3 mL of 9.9M sulfuric acid, what is the theoretical yield of alum?
Answer:
19.5g is the theoretical yield of alum
Explanation:
Based on the balanced reaction, 4 moles of sulfuric acid produce 2 moles of alum. To solve this question we need to find the moles of H2SO4. With these moles we can find the moles of alum and its mass assuming all sulfuric acid reacts producing alum.
Moles Sulfuric Acid:
8.3mL = 0.0083L * (9.9mol/L) = 0.08217 moles sulfuric acid
Moles Alum:
0.08217 moles sulfuric acid * (2mol KAl(SO4)2•12H2O / 4mol H2SO4) =
0.041085 moles KAl(SO4)2•12H2O
Mass Alum -Molar mass: 474.3884 g/mol-
0.041085 moles KAl(SO4)2•12H2O * (474.3884 g/mol) =
19.5g is the theoretical yield of alumRead the selection from the section "Molecules In Motion." The molecules in the hot soup are traveling faster overall than they did before the soup was heated. Conversely, the molecules in an ice cube are moving more slowly. Why did the author use the word "conversely"?
Answer: The author used the word "conversely" because the first statement he made is in CONTRAST to the second statement he made.
Explanation:
Matter is made up of atoms or molecules that are in constant motion. The motion of these tiny particles ( molecules) gives the object energy. The movement of these molecules depends on the state of matter which includes
--> GASEOUS STATE: Here, the particles are completely free to move and are always in motion.
--> LIQUID STATE: particles in this state slide by one another and are always in motion.
--> SOLID STATE: particles in this state are held tightly together but are always in motion.
Also, the molecules in motion are greatly affected by temperature changes. Increase in temperature will cause the particles in the liquid to move faster. Such is seen when soup is heated, the molecules travel faster than before. But the OPPOSITE is seen in an ice cube. This is because the ice cube is in solid state and of a lower temperature.
if the ima of a machine is 4 and the effort force is 6.0 newtons, then the force exerted on the resistance by the machine is
Answer:
24 N
Explanation:
Mechanical advantage is the rate of load overcome to the effort applied to overcome the load or resistance. Also, it is the quotient of the resistance force to the effort force.
i.e MA = [tex]\frac{L}{E}[/tex]
Given that, MA = 4, and L = 6.0 N, then;
4 = [tex]\frac{L}{6}[/tex]
cross multiply to have
L = 4 x 6
= 24 N
L = 24 N
Thus, the force exerted on the resistance by the machine is 24 N.
After a 4.626g sample of silver oxide is heated, 4.306g of silver metal remains. What is the empirical formula of the compound?
please help me ;(
Answer:
The empirical formula is Ag2O.
The empirical formula is Ag2O.Explanation:
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.The ratio of atoms is the same as the ratio of moles. So our job is to calculate the molar ratio of Ag to 2O.
do the steps ...
To get this into an integer ratio, we divide both numbers by the smaller value.
From this point on, I like to summarize the calculations in a table.
ElementAgMass/gXMolesXllRatiomllIntegers
—————————————————−———mAgXXXm7.96Xm0.07377Xll2.00mmm2
mlOXXXXl0.59mm0.0369Xml1mmmml1
There are 2 mol of Ag for 1 mol of O.
Answer:
Hello There!!
Explanation:
The answer is↬The empirical formula is Ag2O. It is the simplest whole-number ratio of atoms in a compound.
hope this helps,have a great day!!
~Pinky~
What are the coefficients needed to balance this chemical reaction to show that matter is conserved?
How many valence electrons does Chlorine need to GAIN to become stable?
Answer:
An atom of a group 17 element such as chlorine has seven valence electrons. It is “eager” to gain an extra electron to fill its outer energy level and gain stability. Group 16 elements with six valence electrons are almost as reactive for the same reason
Explanation:
PPE 15. What variables are you manipulating in this exercise? Identify a symbol to represent each variable.
An ionic substance is formed between a positively charged cation and a negatively charged anion. Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions. Which of the following substances are ionic? Check all that apply. Check all that apply. AlCl3 MgI2 C2H5OH NH3
Answer:
Which of the following substances are ionic?
Check all that apply.
AlCl3
MgI2
C2H5OH
NH3
Explanation:
An ionic substance is formed between a positively charged cation and a negatively charged anion.
Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions.
Among the given substances,
MgI2 is an ionic substance.
Since Mg is the metal atom. It forms a cation.
I is a nonmetal atom. It forms anion.
Hence,
MgI2 is an ionic substance.
Though AlCl3 looks like an ionic substance it is a covalent compound.
This is due to the high polarizability of [tex]Al^3+[/tex] ion.
The remaining two compounds do not contain any metal atoms.
So, ethanol and NH3 are not ionic compounds.
Answer:
MgI2
A compound contains 46.67% Silicon and 53.33% oxygen. What is the
simplest formula for this compound?
Answer:
SiO2
Explanation:
The theoretical yield of NH3 is 945 grams. You conducted the experiment and only produced 598 grams.
Answer:
Given theoretical yield of NH3 is 945g.
The actual yield is 598g.
What is the %yield?
Explanation:
%yield of a chemical reaction can be calculated by using the formula:
[tex]%yield=\frac{actual yield}{theoretical yield} * 100[/tex][tex]\frac{actual yield}{theoretical yield} * 100[/tex]
Substitute the given values in this formula to get the %yield.
[tex]\frac{598g}{945g} * 100\\=63.3[/tex]
Hence, the %yield for the formation of ammonia is ---- 63.3.
Given the reaction at equilibrium:
H2(g) + Cl2(g) → 2HCl(g) + heat
The equilibrium will shift to the right when there is an
increase in
A temperature
B pressure
C concentration of H2(g)
O concentration of HCl(g)
Determine the empirical and molecular formula of a compound composed of 18.24 g Carbon, 0.51 g Hydrogen, and 16.91 g Fluorine has a molar mass 562.0 g/mol.
Answer: the answe
Explanation: 18 cabron - c hydr3gon is is 46.20
In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. Which postulate of kinetic molecular theory best explains
how this is possible?
Attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly
O Collisions between gas particles are elastic, there is no net gain or loss of kinetic energy
Gases consist of a large number of small particles, with a lot of space between the particles
O Gas particles are in constant, random motion, and higher kinetic energy means faster movement
answer:Collisions between gas particlCollisions between gas particles or collisions with the vessel walls are perfectly elastic.
explanation:As long as an ideal gas is maintained at a constant temperature, the average kinetic energy of the molecules is said to be constant. In fact, what we call the temperature of a body at the macroscopic scale is just a representation of the kinetic energy carried by its atoms or molecules as they vibrate inside the body.
Now, if the kinetic energy of this oxygen gas is constant, it is because the collisions between the particles are assumed to be perfectly elastic. No energy is lost during the collisions. The rationale behind this assumption is that the particles are very tiny.
The answer which corresponds best to the explanation above is b. Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy.
• Determine % H2O2 decomposed in first 500 s in a first order decomposition reaction of H2O2? k=7.30x10-4 s-1
Answer:
Given rate constant of the first-order reaction is:
K=7.30x10^-4 s-1
Time t=500s
Determine % H2O2 decomposed in first 500 s in a first-order decomposition reaction of H2O2?
Explanation:
The expression for the rate constant of the first-order reaction is:
[tex]k=\frac{2.303}{t} log \frac{ao}{a-x}[/tex]
where,
k=rate constant
t=time period
ao=initial amount of the reactant
a-x=amount of a remained after time t.
Substitute the given values in the above formula to get ao/a-x value.
[tex]7.30x10^-4 s^-1 = \frac{2.303}{500s} log \frac{ao}{a-x} \\log \frac{ao}{a-x} =7.30x10^-4 s^-1 * \frac{500s}{2.303} \\log \frac{ao}{a-x} =0.158\\\frac{ao}{a-x}=10^{0.158} \\\frac{ao}{a-x}=1.438[/tex]
% of H2O2 decomposed is:
[tex]\frac{ao}{a-x} = 1.438 *100\\ =143.8[/tex]
what is the photoelectic effect
Answer:
When electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.
Explanation:
I'm assuming you mean the photoelectric effect.
Is ivy a monocot or dicot
Answer:
dicot
Explanation:
I looked it up lmoooo
Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction? O sodium hydroxide + water → Sodium + hydrogen O sodium + water → sodium hydroxide + hydrogen O sodium + hydrogen → sodium hydroxide + water O sodium + sodium hydroxide → Water + hydrogen
The word equation that represents the violent reaction between sodium and water is as follows: sodium + water → sodium hydroxide + hydrogen.
What is a chemical reaction?A chemical reaction is the process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.
According to this question, sodium (Na) and water (H2O) are involved in a chemical reaction to produce sodium hydroxide (NaOH) and hydrogen gas (H2).
Therefore, the word equation that represents the violent reaction between sodium and water is as follows: sodium + water → sodium hydroxide + hydrogen
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please help bbg'sssss
Answer:
Explanation:
from the way the trees look, i would say A: Wind from the sky, it seems B: Clouds and in the distance C:Precipitation(rain)
What happens to the electric force between two particles if the distance
between them is doubled?
Answer:
The size of the force varies inversely as the square of the distance between the two charges. Therefore, if the distance between the two charges is doubled, the attraction or repulsion become weaker, decreasing to one-fourth of the original value. ...The size of the force is proportional to the value of each charge.
Identify all of the spectator ions in the reaction below.
Zn(OH)2(s) + 2H+(aq) + 2NO3(aq) → Zn2+(aq) + 2NO3- (aq) + 2H2O
a. Zn(OH)2
b. NO3-
c. Zn2+
d. H
e. H+ and NO3-
i need help answering this question on my homework, could anyone help?
Which sentence about an ocean current is correct
Upwelling is caused by the winds that on the oceans surface is the correct answer.
What are Ocean Current ?Ocean currents are water flow patterns that have an impact on climate zones and weather patterns all around the globe.
When winds blow they push the water from an area and to replace the displaced water water rises from beneath the surface and this process is called Upwelling.
Therefore Option C , Upwelling is caused by the winds that on the oceans surface is the correct answer.
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what is the mass percentage for hydrogen
Answer:
The mass percent of hydrogen in hydrogen peroxide is 5.88
The mass percentage of hydrogen in water is 11.19 percent.
why is water so important for the ecosystem
Answer:
The main function of water is to enhance the plant growth provide a permanent for species that live within it, or provide a temporary home or breeding ground for multiple amphibians, insects and water-birthed organismsand to provide the nutrients and minerals necessary to sustain physical life.
