Answer: an alpha particle/alpha emission
Explanation:
Read 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.
Match each renewable energy source with the correct description. solar cell converts sunlight into electricity geothermal energy turns turbines along coastlines wave water falling through dams turns turbines, generates electricity hydroelectricity o heat produced within the Earth
Answer:
Explanation:
solar cell - converts sunlight into electricity
geothermal energy - heat produced within the Earth
wave energy - turns turbines along coastlines
hydroelectricity - water falling through dams turns turbines, generates electricity
Answer:
Explanation:
The renewable energy sources are: solar cell, geothermal, wave and hydroelectricity. Their descriptions are as follows:
converts sunlight into electricity -> solar cell
energy turns turbines along coastlines -> wave
water falling through dams turns turbines, generates electricity -> hydroelectricity
heat produced within the Earth -> geothermal
What is the volume of a 0.25 M MgCl2 solution that contains 0.75 moles of MgCl2?
Answer:
The volume of the solution is 3 L.
Explanation:
Molarity is a measure of the concentration of that substance that indicates the number of moles per unit volume. In other words, molarity is the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.
[tex]Molarity=\frac{number of moles of solute}{solution}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}=M[/tex]
In this case:
Molarity= 0.25 Mnumber of moles of solute= 0.75 molesvolume= ?Replacing in the definition of molarity:
[tex]0.25 M=\frac{0.75 moles}{volume}[/tex]
volume*0.25 M= 0.75 moles
[tex]volume=\frac{0.75 moles}{0.25 M}[/tex]
volume= 3 L
The volume of the solution is 3 L.
What is the difference between chemical and physical change with respect
to behavior and fate of molecules?
Answer:
Physical changes are changes that do not alter the identity of a substance. Chemical changes are changes that occur when one substance is turned into another substance.
Explanation:
Is ivy a monocot or dicot
Answer:
dicot
Explanation:
I looked it up lmoooo
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.
Which sublevel contains valance electrons in an atom of magnesium (mg)?
A. 2s
B. 2p
C. 3s
D. 3p
• 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]
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-
Which of the following is not an amphoteric substance?
a) lead(II) oxide
b) aluminum hydroxide
C) iron(ill) oxide
d) zinc oxide
Sắt oxit
Explanation:
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 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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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
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
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)
A 800mL of gas sample at STP is compressed to a volume of 200 mL, and temperature increased to 30 °C, what will be the new pressure in kpa.
Answer:
449.7 kPa
Explanation:
We prepare the Ideal Gases Law to solve this question:
P . V = n . R . T
As moles of gas are the same, and R is constant, we can compare this two situations:
P₁ . V₁ / T₁ and P₂ . V₂ / T₂
As this remains constant we can propose:
P₁ . V₁ / T₁ = P₂ . V₂ / T₂
We convert T° to Absolute value: 30°C + 273 = 303 K
We convert the volume from mL to L
800 mL . 1L /1000 mL = 0.8 L
200 mL . 1L /1000 mL = 0.2 L
1 atm . 0.8 L / 273 K = P₂ . 0.2L / 303k
(0.8 L.atm / 273K ) . 303k = P₂ . 0.2L
0.8879 L.atm / 0.2L = 4.4 atm
We convert pressure from atm to kPa
4.4 atm . 101.3 kPa / 1 atm = 449.7 kPa
Answer:
450. kPa
Explanation:
Use the combined gas law. Solve for the unknown. Plug in the numbers, turn the crank, and out pops the answer. A typical plug-n-chug problem.
P1V1 / T1 = P2V2 / T2 …………….. combined gas law
P2 = P1V1T2 / (T1V2) ……………… solve for P2
P2 = 101.3 kPa x 800. mL x 303K / 273K / 200. mL
P2 = 450. kPa
We are assuming 3 significant digits, simply because it makes more sense than having only one significant digit. You didn’t actually specify a pressure unit, but I’m guessing you mean kilopascal, (kPa).
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.
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
What is the mass of 4.7 moles of H2O
Answer:
ans.........❣️❣️❣️❣️❣️❣️❣️❣️❣️❣️❣️
Answer:
[tex]1 \: mole \: weighs \: 18 \: g \\ 4.7 \: moles \: weigh \: (4.7 \times 18) \: g \\ = 84.6 \: g[/tex]
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.
Which of the following best summarizes what happens in a displacement reaction?
A
Two elements react to form a compound.
B
A compound breaks down into elements.
C
An element and a compound react to form a different element and compound.
D
An element and a compound react to form another compound.
Answer:
C
Explanation:
Here's an example of displacement reaction:
2 Al (s) + 3 CuSO4 (aq) -> 3 Cu (s) + Al2(SO4)3 (aq)
note that aluminium and copper are elements,
copper II sulphate and aluminium sulphate are compound
The statement that best describes displacement reaction is an element and a compound react to form a different element and compound. The correct option is C.
What is displacement reaction?When a more reactionary element displaces, or continues to push out, a less reactive element from a compound containing the less reactive element, a displacement reaction occurs.
The less reactive element is now pure and uncombined following a displacement reaction.
A single-displacement reaction occurs when a more reactive element in a compound replaces a much less reactive element.
Metal displacement, hydrogen displacement, and halogen displacement are the three types of displacement reactions.
An element as well as a compound react to form a specific component and compound, according to the best description of displacement reaction.
Thus, the correct option is C.
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(13)
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
Question 11 of 25
Which functional group does the molecule below contain?
HIT
H-C-OH
H
A. Hydroxy
B. Ether
C. Amino
O D. Carbonyl
Carbonyl functional group contain molecule H-C-OH. Hence, option D is correct.
What is a functional group?A functional group is a group of atoms responsible for the reactions of a particular compound.
A carbonyl group contains a double bond linking a carbonyl carbon atom and a carbonyl oxygen atom. The carbonyl oxygen atom shares six valence electrons with the carbonyl carbon atom.
Hence, the carbonyl functional group contain the molecule H-C-OH.
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Answer:
A, hydroxyl
Explanation:
Just took the test on apex and the other answer was wrong and hydroxyl was correct
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.
i need help answering this question on my homework, could anyone help?
What are the coefficients needed to balance this chemical reaction to show that matter is conserved?
Un método de laboratorio para preparar O 2 (g) consiste en la descomposición de KCIO 3 (s): KCIO 3 (s) KCI(s) + O 2 (g) a) ¿Cuántos moles de O 2 se producen cuando se descomponen 32,8 g de KCIO 3 ? b) ¿Cuántos gramos de KCIO 3 deben descomponerse para obtener 50 g de 02? c) ¿Cuántos gramos de KCI se forman al descomponerse KCIO 3 formándose 28,3 g de O2? 3. ¿Cuántos gramos de Ag 2 CO 3 deben haberse descompuesto si se obtuvieron 7511 g de Ag según la reacción: Ag 2 CO 3 Ag(s) + CO 2 (g) + O 2 (g)?
Answer:
2a. 0.401 moles de O2
b. 127.7g KClO3
c. 43.95g KCl
3. 9600g Ag2CO3 debieron haberse descompuesto
Explanation:
Basados en la reaccion:
2KCIO 3 (s) → 2KCI(s) + 3O 2
2 moles de KClO3 producen 3 moles de oxígeno:
a. 32.8g de KClO3 son:
Moles KClO3 -Masa molar: 122.55g/mol-
32.8g * (1mol / 122.55g) = 0.2676 moles KClO3
Moles O2:
0.2676 moles KClO3 * (3moles O2 / 2mol KClO3) =
0.401 moles de O2
b. 50g O2 son:
Moles O2 -Masa molar: 32g/mol-
50g O2 * (1mol/32g) = 1.5625 moles O2
Moles KClO3:
1.5625 moles O2 * (2mol KClO3 / 3mol O2) = 1.042 moles KClO3
Masa KClO3:
1.042 moles KClO3 * (122.55g/mol) =
127.7g KClO3
c. Las moles de O2 son:
28.3g O2 * (1mol / 32g) = 0.88 moles O2
Moles KCl:
0.88 moles O2 * (2mol KCl / 3mol O2) = 0.5896 moles KCl
Masa KCl -Masa molar: 74.55g/mol-
0.5896 moles KCl * (74,55g/mol) = 43.95g KCl
3. Basados en la reacción:
2Ag 2 CO 3 → 4Ag(s) + 2CO 2 (g) + O 2 (g)?
2 moles de Ag2CO3 reaccionan produciendo 4 moles de Ag. Las moles de Ag son:
Moles Ag -Masa molar: 107.8682g/mol-
7511g Ag * (1mol/107.8682g) = 69.63 moles Ag
Moles Ag2CO3:
69.63 moles Ag * (2moles Ag2CO3/4molesAg) = 34.82 moles Ag2CO3
Masa Ag2CO3-Masa molar: 275.7453g/mol-
34.82 moles Ag2CO3 * (275.7453g/mol) =
9600g Ag2CO3 debieron haberse descompuesto
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:
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.
