Answer:
Smaller
Explanation:
I took the test
What series of decays would allow you to turn Lead, Pb-207 into Gold, Au-199?
Answer:
Two alpha particle decays and one beta particle decay.
Explanation:
If Lead Pb-207 is to turn into Gold, Au-199, there needs to be a drop in mass number from 207 to 199. That drop is 207 - 199 = 8.
Since the mass number of an alpha particle(⁴₂He) is 4, to lose 8 nuclear particles(neutron + proton), we need 8 particles/nucleus ÷ 4 particles per alpha particle nucleus = 2 alpha particles.
The nuclear equation is given below
²⁰⁷₈₂Pb → ¹⁹⁹₇₉Au + ⁴₂He + ⁴₂He
Note that the charge is not balance
82 ≠ 79 + 2 + 2 = 83
For this to be balanced, we need to lose a beta particle, ⁰₋₁e. So, our equation becomes
²⁰⁷₈₂Pb → ¹⁹⁹₇₉Au + ⁴₂He + ⁴₂He + ⁰₋₁e
So, series of decays would allow you to turn Lead, Pb-207 into Gold, Au-199 are two alpha particle decays and one beta particle decay.
What is a jet stream. in your own words but be more detailed about what you say.
(don't send a link or file)
What is the number of moles of glucose (C₆H₁₂O₆) in 0.500 L of a 0.40 M solution?
Answer:
0.20 moles
Explanation:
In order to solve this problem it is necessary to keep in mind the definition of molarity:
Molarity = moles / litersIf we input the data given by the problem we're left with:
0.40 M = moles / 0.500 LMeaning that we can proceed to calculate the number of moles:
moles = 0.40 M * 0.500 Lmoles = 0.20 molesThe number of moles of glucose ([tex]C_6H_{12}O_6[/tex]) in 0.500 Liters of a 0.40 M solution is 0.2 moles.
Given the following data:
Molarity of solution = 0.40 MVolume of solution = 0.500 LTo determine the number of moles of glucose ([tex]C_6H_{12}O_6[/tex]) in 0.500 Liters of a 0.40 M solution:
Mathematically, the molarity of a solution is given by the formula:
[tex]Molarity = \frac{number\;of\;moles}{Volume \;in\;liters}[/tex]
Making number of moles the subject of formula, we have:
[tex]Number\;of\;moles = Molarity \times Volume[/tex]
Substituting the given parameters into the formula, we have;
[tex]Number\;of\;moles = 0.40 \times 0.500[/tex]
Number of moles = 0.2 moles.
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Please help me I need help.
How many grams of sugar (C12H22011) is needed to make a 1.3 L solution that is 0.13 M?
2C2H6 + 8O2 = 4CO2 + 6H2O
My teacher wants to know how many moles are required, how many moles oaf carbon dioxide are produced and how many moles of water are produced. Can somebody please help me?
Answer:
4 moles of carbon
6 moles of water
Explanation:
I think as there no data given u have to is the numbers infront of the equation e.g 4CO2 so 4.
hope this helps :)
how are living organisms in an ecosystem linked
Answer:
An environment is a local area of living creatures existing related to the nonliving segments of their current circumstance, interfacing as a framework. These biotic and abiotic segments are connected together through supplement cycles and energy streams.
Explanation:
Answer:
Living organisms require a proper, stable ecosystem/envirornment to function
Explanation:
If some salt were accidently spilled as it was transferred from the balance to the cup would your calculated enthalpy of solution of the salt be too high or too low
Answer:
It would be to low
Explanation:
If some salt were accidently spilled as it was transferred from balance to cup calculated enthalpy of solution of salt be too low as there will be loss in mass which would lead less solubility of salt and hence less enthalpy.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Nearly ¾ of the world's surface is covered with water so most of the earth's living things live in the
Answer:
ocean
Explanation:
aavssdbvsvasgvesvdbvsvdbvv
Answer:
oceans/lakes/ponds/rivers/creeks/seas
Explanation:
How many grams are in 0.428 moles of lithium carbonate, Li3PO4?
42.7
49.6
54.8
72.3
The shape of the methane molecule(ch4) is called
Answer:
Tetrahedral
Explanation:
Why is Dalton's Gas Law a problem for people who visit high altitudes?
how many ml of 10.0 m cacl2 do we need to prepare 3.00 l of a 0.500 m cacl2 solution
Answer:
150 mL
Explanation:
From the question given above, the following data were obtained:
Molarity of stock solution (M₁) = 10 M
Volume of diluted solution (V₂) = 3 L
Molarity of diluted solution (M₂) = 0.5 M
Volume of stock solution needed (V₁) =?
The volume of stock solution needed can be obtained as follow:
M₁V₁ = M₂V₂
10 × V₁ = 0.5 × 3
10 × V₁ = 1.5
Divide both side by 10
V₁ = 1.5 / 10
V₁ = 0.15 L
Finally, we shall convert 0.15 L to mL. This can be obtained as follow:
1 L = 1000 mL
Therefore,
0.15 L = 0.15 L × 1000 mL / 1 L
0.15 L = 150 mL
Therefore, the volume of the stock solution needed is 150 mL
What happens as liquid water boils?
A) The molecules are destroyed.
B) The mass of the molecules decreases.
C) The molecules become separated from each other.
D) The molecules break down into hydrogen and oxygen atoms.
Answer:
C) The molecules become separated from each other.
Explanation:
PLESE HELP WILL GIVE BRAINLYESTY
Imagine that you are Andreas Vesalius. Write a short autobiographical statement that talks about who you are, where you’re from, and some of your important contributions.
Answer:
My name is Andreas Vesalius and I'm a 16th-century Flemish anatomist, physician, and author of one of the most influential books on human anatomy, De Humani Corporis Fabrica Libri Septem. I am often referred to as the founder of modern human anatomy. I was born in Brussels, December 31, 1514 which was then part of the Habsburg Netherlands. I was a Flemish doctor who was notable for my contribution to the science of anatomy of the human body. I was the first to perform public dissection on a human corpse, a practice that was unusual in the Middle Ages due to spiritual beliefs.
Explanation:
The pressure of a 980.0 mL sample of gas at a constant temperature is increased from 0.4620 atm to
0.6320 atm. What is the final volume of the gas?
Answer:
P
1
V
1
T
1
=
P
2
V
2
T
2
Explanation:
P
1
V
1
T
1
=
P
2
V
2
T
2
, given a constant quantity of gas.
And thus,
P
1
×
V
1
×
T
2
V
2
×
T
1
=
P
2
, even given this format, we can see the problem is dimensionally sound. We do need to use
absolute temperature.
P
2
=
1.00
⋅
a
t
m
×
250
⋅
m
L
×
313
⋅
K
500
⋅
m
L
×
293
⋅
K
≅
1
2
⋅
a
t
m
.
Explanation:
Which of these is not an organ in the
digestive system?
A. heart
B. stomach
C. intestine
Answer:
a
Explanation:
organs are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system. The small intestine has three parts.
3. Balance the chemical equations
Answer:
A) BaCl2 + 2NaOH → Ba(OH)2 + 2NaCl
B) H2SO4 + 2KOH → K2SO4 + H2O
C) K2O3 + 2HCl → 2KCl + H2O + CO2
D) 2FeSO4 → Fe2O3 + SO2 + SO3
E) 2NaNO3 → 2 NaNO2 + O2
Explanation:
Answer:
A) BaCl² + 2NaOH → _Ba(OH)² + 2NaCl
B) H²SO⁴ + 2KOH → _K²SO⁴ + H²O
C) K²CO³ + 2HCl → _KCl + H²O + CO²
D) 2FeSO⁴ → _Fe²O³ + _SO² + _SO³
E) 2NaNO³ → 2NaNO² + _O²
help me pass this test my last day of school is may 26 if you don’t mind I have more questions :)
Answer:
equal
Explanation:
Ms. Kastenberg spilled a bottle of paint outside in the sun. Over time, the paint dried. This is because:
A
The paint reflected the energy from the light
B
The light was too strong for the paint
с
The sun removed energy from the paint
D
The paint absorbed the energy from the light
Answer:
I believe that the answer is the paint absorbed the energy from the light
Explanation:
The paint dried because the paint absorbed the energy from the light and the correct option is option D.
What is absorption of light?Light absorption is the process in which light is absorbed by matter and converted into energy. In an atom, electrons vibrate at a specific frequency – this is called the natural frequency.
If a wave of light hits a material in which the electrons are vibrating at the same frequency as the wave of light, the electrons will absorb the energy and convert it into vibrational motion.
This is why objects have different colours – different materials’ electrons will vibrate at different rates, and therefore absorb different frequencies of light.
Therefore, the paint dried because the paint absorbed the energy from the light and the correct option is option D.
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HURRY PLEASE
What volume is occupied by 3.12 moles of a gas when the pressure is 88.4 kPa at a temperature of 19℃?
Answer:
The Combined Gas Law shows that the pressure of a gas is inversely proportional to volume and directly proportional to temperature. Avogadro's Law shows that volume or pressure is directly proportional to the number of moles of gas. Putting these together leaves us with the following equation:
P1×V1T1×n1=P2×V2T2×n2(11.9.1)
As with the other gas laws, we can also say that (P×V)(T×n) is equal to a constant. The constant can be evaluated provided that the gas being described is considered to be ideal.
The Ideal Gas Law is a single equation which relates the pressure, volume, temperature, and number of moles of an ideal gas. If we substitute in the variable R for the constant, the equation becomes:
P×VT×n=R(11.9.2)
The Ideal Gas Law is conveniently rearranged to look this way, with the multiplication signs omitted:
PV=nRT(11.9.3)
The variable R in the equation is called the ideal gas constant.
Explanation:
an organism that lives in or on another organism and causes harm to is a
A. host
B. parasite
C. prey
D. producer
the answer is B. Parasite.
Look at the chemical equation.
HI (aq) + LiOH (aq) → LiI (aq) + H2O (l)
a) What is the total ionic equation?
b) What is the net ionic equation?
c) What is/are the spectator ion(s)?
d) What is the salt that is formed?
Answer:
See explanation
Explanation:
a) The total ionic equation shows all the ions involved in the equation as follows;
H^+(aq) + I^-(aq) + Li^+(aq) + OH^-(aq) ----> Li^+(aq) + I^-(aq) + H2O(l)
b) The net ionic equation only involves the ions that truly participated in the reaction.
H^+(aq) + OH^-(aq) ----> H2O(l)
c) The spectator ions appear on both sides of the reaction equation. They are; I^- and Li^+.
d) The salt formed is LiI (lithium iodide)
an organism that a parasite lives in or on is a
A. prey
B. host
C. consumer
D. prey
if you can please give me the correct answer i’ll give you a brainliest only if it’s correct thanks!
The chemical name for MgCl3
Answer:
The chemical name is magnesium chloride
Answer:
Magnesium chloride
Please mark as brainliest if answer is right
Have a great day, be safe and healthy
Thank u
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a compound formed when atoms of two or more different elements share electrons
a compound formed when atoms of two or more different elements share electrons
This statement is true.
bacterial cells.
Which label belongs in the area marked animal?
nucleus
DNA
cell wall
ribosomes
Answer:
I believe it would be (nucleus)
Question: How do we read chemical formulas?
Any molecule can be represented by a formula that lists all the atoms in that molecule. Each element is represented by its atomic symbol in the Periodic Table – e.g. H for hydrogen, Ca for calcium. If more than one atom of a particular element is present, then it’s indicated by a number in subscript after the atomic symbol — for example, H2O means there are 2 atoms of hydrogen and one of oxygen.
If there is more than one of whole groups of atoms, then that’s shown with a bracket around them. For example, calcium hydroxide has one calcium (Ca) for every two hydroxides (OH), so is written as Ca(OH)2.
If a charge is present, it’s indicated in superscript, with a sign (+/-) and a number if more than one charge is present. For example, calcium ions have two positive charges so are written Ca2+.
Sometimes a formula can be written in a way that gives an indication of the structure. A chemical equation shows a reaction taking place. On the left-hand side are the reactants, the molecules that take part in the reaction. On the right-hand side are the products, the molecules that are created in the reaction. Each side must contain the same number of each kind of atom. An arrow between them indicates the direction the reaction is expected to occur:
Ca + Cl2 → CaCl2
Calcium + chlorine → Calcium chloride
If there are two or more of any molecules, that’s indicated with a number in front of the molecule:
CH4 + 2O2 → CO2 + 2H2O
One methane molecule + two oxygen molecules → one carbon dioxide molecule and two water molecules
An equation may sometimes specify which phase each molecule is in – whether it’s solid, liquid, or gas, or if it’s dissolved. This is written in brackets after the molecule – (s) for solid, (l) for liquid, (g) for gas, and (aq) for ‘aqueous’, meaning dissolved in water. For example, solid calcium carbonate reacts with carbonic acid in water to form calcium bicarbonate, which is much more soluble so becomes dissolved in water:
CaCO3 (s) + H2CO3 (aq) → Ca(HCO3)2 (aq)
Solid calcium carbonate + dissolved carbonic acid → dissolved calcium bicarbonate
All chemical reactions can actually proceed in either direction. Most of the time, one direction is expected to take place more strongly, so the arrow is written in that direction. However, many common reactions happen in both directions simultaneously, creating an equilibrium where the reactions are taking place but there is no net change in concentration from one side to the other. This is indicated with the symbol ⇌.
For example, carbonic acid in water is continually breaking down into bicarbonate and hydrogen ions – but the ions are also continually joining back together.
H2CO3 ⇌ HCO3– + H+
Carbonic acid ⇌ bicarbonate + hydrogen ions
1.0 moles of an ideal gas are held in a container under 2.0 atm of pressure and 310 K. What must be the volume of this container?
Answer:
12.7 L (3 s.f.)
Explanation:
Since it is an ideal gas, we can apply the ideal gas law:
[tex]\boxed{pV=nRT}[/tex]
☆ where p= pressure
V= volume
n= number of moles
R= ideal gas constant
T= temperature
Substitute all the given information into the formula:
2V= 1(0.08206)(310)
2V= 25.4386
V= 25.4386 ÷2
V= 12.7 L (3 s.f.)
Further explanation:
The ideal gas constant, R, has different values depending on what units are being used. Two examples are listed below:
[tex]• \: 0.08206 \: L \: atm ^{ - 1} \: mol \: K[/tex]
[tex]• \: 8.314 \: J \: {mol}^{ - 1} \: {K}^{ - 1} [/tex]
In the above question, we use the value 0.08206 because the pressure was given in atm and the temperature was given in Kelvin. Thus, the unit used for volume is L.
Answer: 12.7 L
Explanation:
P=2.0atm
V= ???
n=1.0 mol
R= 0.0821
T= 310K
PV=nRT--> (2)V=(1)(0.0821)(310)
V=12.7 L