the answer is Te because O is oxygen.
Answer:
O
Explanation:
this is because it is oxygen
One mole of Beryllium weighs 9.0122 grams. How many atoms of Beryllium are
there?
4
9.0122
6.022 x 10^23
18
Answer:
4
Explanation:
cause 1 mole of beryllium weighs 4gram
the electrolyte does not need heating to keep it in its molten state; why?
Answer:
Because an electrolyte already has mobile molecules.
Plzzzz someone Help fasttt
Answer:
1,181 g
Explanation:
143.091 × 8.250 = 1,180.5 round up to 1,181
A se ion has a mass number of 77
and a charge of −2
. Determine the number of neutrons, protons, and electrons in this ion.
Answer:
1. Neutron number = 43
2. Proton number = 34
3. Electron number = 36
Explanation:
From the question given above, the following data were obtained:
Mass number = 77
Charge of ion = –2
1. Determination of the number of neutron.
Mass number of Se = 77
Atomic number = 34
Neutron number =?
NOTE: Atomic number = proton number
Mass number = Proton + Neutron
77 = 34 + Neutron
Collect like terms
77 – 34 = Neutron
Neutron number = 43
2. Determination of the proton number.
The atomic number of an element is simply defined as the number of protons in the atom of the element. Mathematically,
Atomic number = Proton number
Atomic number of Se = 34
Therefore, the proton number of Se²¯ is 34.
NOTE: The atomic number does not change be it atom, ion or molecule. It remains the same.
3. Determination of electron number.
Charge of ion = –2
Proton number = 34
Electron number =?
Proton – Electron = Charge
34 – Electron = –2
Rearrange
34 + 2 = Electron
36 = Electron
Electron number = 36
There are 43 neutrons, 34 protons, and 36 electrons in the given selenium ion with a (-2) charge.
Explanation:
Given:
A selenium ion with a mass number of 77 and a charge of (-2).
To find:
The number of neutrons, protons, and electrons in selenium ion
Solution:
Charge on the selenium ion = -2
The atomic number of selenium = 34
Number of protons = Atomic number
Number of protons in selenium atom = 34
Number of protons in selenium ion = 34
Number of electrons in selenium atom = 34
Number of electrons in selenium ion= 34+2 = 36
(anion is formed by gaining of electrons that is why adding two electrons )
The mass number of selenium = 77
Mass number = Number of protons + Number of neutrons
77 = 34 + Number of neutrons in selenium
Number of neutrons in selenium ion = 77 - 34 = 43
There are 43 neutrons, 34 protons, and 36 electrons in the given selenium ion with a (-2) charge.
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Cu+2 + 2e- ———> Cu E*= 0.52 V
Ag+1 + 1e- ———> Ag E*= 0.80 V
Using the two cell reduction potential shown for the corresponding reaction calculate the cell potential for a voltaic cell made from these two metals.
A. 1.32 V
B. -0.28 V
C.0.28 V
D. -1.32 V
Answer:
C.0.28 V
Explanation:
Using the standard cell potential we can find the standard cell potential for a voltaic cell as follows:
The most positive potential is the potential that will be more easily reduced. The other reaction will be the oxidized one. That means for the reactions:
Cu²⁺ + 2e⁻ → Cu E° = 0.52V
Ag⁺ + 1e⁻ → Ag E° = 0.80V
As the Cu will be oxidized:
Cu → Cu²⁺ + 2e⁻
The cell potential is:
E°Cell = E°cathode(reduced) - E°cathode(oxidized)
E°cell = 0.80V - (0.52V)
E°cell = 1.32V
Right answer is:
C.0.28 V
Please answer. Brainliest!
Answer:
the equation is unbalanced
What is the phase of water at 1.0 atm and 50°C?
A. Liquid and gas
B. Solid
C. Liquid
D. Gas
50 ml of 0.2 M acetic acid is shaken with 10 g activated charcoal. The concentration of acetic acid is reduced to 0.5 times the original molarity. The amount of solute (in g) adsorbed per gram of the adsorbent is approximately
Answer:
[tex] 0.03 g_{acid}/g_{charcoal} [/tex]
Explanation:
The amount adsorbed (solute) is the acetic acid, and the adsorbent is the activated charcoal. The mass of the adsorbent is 10 g.
So, we need to calculate the mass of the acetic acid as follows:
[tex] m = n*M = C*V*M [/tex]
Where:
n: is the number of moles = C*V
M: is the molecular mass = 60.052 g/mol
C: is the final concentration of the acid = 0.5*0.2 mol/L = 0.10 mol/L
V: is the volume = 50 ml = 0.050 L
[tex] m_{acid} = C*V*M = 0.10 mol/L*0.050 L*60.052 g/mol = 0.30 g [/tex]
Now, the amount of solute adsorbed per gram of the adsorbent is:
[tex] \frac{m_{acid}}{m_{charcoal}} = \frac{0.30 g}{10 g} = 0.03 g_{acid}/g_{charcoal} [/tex]
Therefore, the amount of solute adsorbed per gram of the adsorbent is 0.03 g/g.
I hope it helps you!
PLEASE HELP! Will give BRAINLIEST——List two possible steps where copper yield may be lost (why you may not get all the copper back at the end). Be specific about the steps and how they might lose the copper.
Answer:
Throughout the below section of explanation, the two possible steps are provided.
Explanation:
The CuO produced by that of the Cu(OH)2 heat treatment might cause reduced copper output, It's because of the technique of decanting. Following this Cu(OH)2, this would be translated into filtered parchment which causes certain contaminants to be added in the specimen and therefore doesn't decant throughout warming.When H2SO4 would be added to that same CuO that has been produced throughout the ending phase, CuSO4 has been accumulated that is transmitted as a way to solve something else that might reduce or lose copper content.heyoo I need help pleaseeeeee
c) Current cannot flow
Reason: Because the switch is not closed.
Answer:
current can't flow
Explanation:
by the way of explanation it is open circuit in which the current flow whereas in closed circuit the current flow.
if you like my answer please mark as brainlist.
it will be too much help for me.
The image shows two siblings with their grandparents.
Which best explains why the siblings look more like each other and less like their grandparents?
The siblings are more closely related to each other than they are to their grandparents.
Each sibling is more closely related to the grandparents than to the other sibling.
The grandparents do not have any shared characteristics in common with the siblings.
The grandparents do not have any shared characteristics with one another.
Answer:
the siblings are more closely related to eachother than they are to their grandparents
Answer:
a
Explanation:
The hydrogen emission spectrum is shown below. What is the energy of the
486 nm emission line? (The speed of light in a vacuum is 3.00 x 10^8 m/s, and Planck's constant is 6.626 x 10^-34 Jos.)
A. 2.44 x 10^18 J
B. 7.33 x 10^26 J
C. 6.17 x 10^14 J
D. 4.09 x 10^-19 J
Answer:
D
Explanation:
answer is in photo above
tfttvvrggvcfdtyiuhouiug
Consider the two facts below:
Fact 1: Dissolved oxygen is one of the most
important nutrients needed by fish in the aquatic
environment to survive.
Which scenarios may be explained by the facts on
the left? Check all that apply.
ID There is more dissolved oxygen in colder
waters than in warm water.
IM
Fact 2: Unlike solids, whose solubility increases
with increasing temperature, the solubility of gases
generally decreases with increasing temperature.
IND
There is less dissolved oxygen in colder
waters than in warm water.
Fish life in the ocean is more abundant during
the seaons with warmer water than seasons
with cooler water
HII
If ocean temperatures rise, then the risk to
the fish population increases.
DONE W
Answer:
A. There is more dissolved oxygen in colder waters than in warm water.
D. If ocean temperature rise, then the risk to the fish population increases.
Explanation:
Conclusion that can be drawn from the two facts stated above:
*Dissolved oxygen is essential nutrient for fish survival in their aquatic habitat.
*Dissolved oxygen would decrease as the temperature of aquatic habit rises, and vice versa.
*Fishes, therefore, would thrive best in colder waters than warmer waters.
The following are scenarios that can be explained by the facts given and conclusions arrived:
A. There is more dissolved oxygen in colder waters than in warm water (solubility of gases decreases with increase in temperature)
D. If ocean temperature rise, then the risk to the fish population increases (fishes will thrive best in colder waters where dissolved oxygen is readily available).
Answer: the answers are A and D
Explanation:
i got it right
what is the pound mole of co2
Se puede inferir que el órgano de los sentidos que contiene un mayor número de terminaciones nerviosas debido a su extensión es *
Answer:
La piel.
Explanation:
La piel es el órgano que forma el límite del cuerpo con el mundo exterior. La piel sirve para varios propósitos. Protege al cuerpo de influencias externas como el calor, el frío, la radiación o las bacterias y ayuda a mantener un ambiente interno estable. La piel está fuertemente atada a los huesos y tejidos. Por lo general, la piel alberga más de 100 especies bacterianas diferentes y algunas investigaciones sugieren que la mayoría de estas bacterias son beneficiosas y aumentan la probabilidad de que se evite la infestación de parásitos.
HELP ME PLEASEEE ILL MARk u the brainliest
Answer:
3rd or 4th answer is correct
OPTION B is the correct answer
Which of the following would be expected to have the lowest boiling point?
CH3CH2CH2CH3, CH3CH2NHCH3, NH2CH2CH2NH2, CH3CH2CH2NH2
O CH3CH2NHCH3
O NH2CH2CH2NH2
O CH3CH2CH2NH2
O CH3CH2CH2CH3
Answer:
CH3CH2CH2CH3
Explanation:
The boiling point of a compound depends on the nature of intermolecular interaction between the molecules of the compound.
If a molecule is nonpolar and has a low molecular mass, then its molecules are most likely held together only by weak intermolecular bonds such as dispersion forces. These forces are easily broken and the molecules move apart hence the molecule possess a low boiling point.
Polar molecules and molecules having higher molecular mass tend to have higher boiling points.
Among all the compounds listed, CH3CH2CH2CH3 is non polar and has the lowest molecular mass hence it exhibits the least boiling point.
please show step by step and I will mark you as brainliest answer ❤️
Answer: The pH of the solution is 13.
Explanation:
pOH is defined as the negative logarithm of hydroxide ion concentration present in the solution.
[tex]pOH=-\log [OH^-][/tex]
We are given:
Concentration of [tex]Ca(OH)_2=0.05mol/dm^3=0.5mol/L[/tex] (Conversion factor: [tex]1L = 1dm^3[/tex] )
1 mole of calcium hydroxide produces 1 mole of calcium ions and 2 moles of hydroxide ions
Concentration of [tex]OH^-=(2\times 0.05)=0.1mol/L[/tex]
Putting values in above equation, we get:
[tex]pOH=-\log (0.1)\\\\pOH=1[/tex]
We know:
[tex]pH+pOH=14\\\\pH=14-1\\\\pH=13[/tex]
Hence, the pH of the solution is 13.
⬆️= you need to come up with investigation question, to help inform your decision.
Think about how land, water, and air absorb and release
Thermal energy and then formulate your hypothesis
I need some Investigation questions about how land, water, and air absorb and release
Thermal energy :,)
Subject: science
Answer:
1. how dense is the land and what matreal
2. what is the humidity and is there any wind
3.how pure is the water if it full of minarils
Explanation:
How many electron containing orbitals are in an atom of tin ?
Answer:
10
Explanation:
how many electron-containing d orbitals are there in an atom of tin? name the element in the 4th period whose atoms have the same number of highest-energy-level elctrons as tin
10, germanium
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the total number of orbitals containing electrons in an atom of tin are 10 orbitals.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The electronic configuration of tin is 1s² 2s² 2p⁶ 3s²3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²4d¹⁰ 5p² or [Kr] 5s² 4d¹⁰ 5p². The total number of orbitals containing electrons in an atom of tin are 10 orbitals. tin an element that belongs to p block of periodic table.
Therefore, the total number of orbitals containing electrons in an atom of tin are 10 orbitals.
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why is polyester hard to decompose
Polyester is not biodegradable
A gas volume of 800.0 litres at _23.00 Celsius and 300.0 torr what would the volume of the gas be at 227.0 Celsius and 600.0 torr of pressure
Answer:
676 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 800 L
Initial temperature (T₁) = 23 °C = 23 + 273 = 296 K
Initial pressure (P₁) = 300 torr
Final temperature (T₂) = 227 °C = 227 + 273 = 500 K
Final pressure (P₂) = 600 torr
Final volume (V₂) =?
The final volume of the gas can be obtained as follow:
P₁V₁/T₁ = P₂V₂/T₂
300 × 800 / 296 = 600 × V₂ / 500
240000 / 296 = 600 × V₂ / 500
Cross multiply
296 × 600 × V₂ = 240000 × 500
177600 × V₂ = 12000000
Divide both side by 177600
V₂ = 12000000 / 177600
V₂ = 675.68 L
V₂ ≈ 676 L
Thus, the final volume of gas is 676 L
How many places after the decimal should your measurements contain?
Answer:
Minimum 2. ( Thats how I do, and till now there is no probs)
Thank You'
Hope it helps u
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While molecules such as glucose move freely in the blood, triglycerides are carried in the blood by very low density lipoproteins (VLDLs) in the form of chylomicrons. A chylomicron resembles a droplet, with phospholipid heads and VLDLs facing water, the solvent of blood, while triglycerides are found within. The outer surface resembles that of a regular phospholipid bilayer. If the contents of a chylomicron are all lipids
A. then they should be soluble in blood plasma.
B. an inner layer is needed because phospholipids always form bilayers,
C. there is no need for an inner phospholipid layer in a chylomicron
Answer:
B. an inner layer is needed because phospholipids always form bilayers.
Explanation:
Lipids are organic compounds which are not soluble in water but they are soluble in organic compounds. They are formed in body by combination of various molecules. The inner layer of phospholipids always form bilayers.
How many meters are in 37 cm?
0.37 m
0.037 m
3700 m
370 m
Answer:
the correct answer is 0.37m
Explanation:
37/100 = 0.37m
Answer:
How many meters are in 37 cm?
In 37 cm - 0.37 m
>3
What happens in nuclear fission?
A. Electrons fall to lower energy levels, emitting photons.
B. Two separate nuclei join together to form one nucleus.
C. A nucleus gains neutrons by emitting an alpha particle.
D. A nucleus is divided into more than one nucleus.
Answer: D
Explanation:
I just did it
can someone pls tell me if this is correct? and also if possible, pls explain the difference between fractional and simple distillation, thank you sm <3
Explanation:
everything can be found in the picture
The formation of a gaseous product is usually indicated by a/an______________ in a chemical reaction.
Answer: The formation of a gaseous product is indicated by an UPWARD ARROW in a chemical reaction.
Explanation:
A chemical reaction is defined as the process whereby chemical bonds between atoms of
substances known as reactants are either formed or broken leading to the formation of products. New substances are usually formed during a chemical reaction. The following are features of chemical reaction:
--> Evolution of gas
--> Formation of a precipitate
--> Change in color
--> Change in temperature
--> Change in state and
--> Formation of new substances.
Some chemical reactions takes place with the evolution of gas. This can be seen in the reaction of Zinc metal with hydrochloric acid. Hydrogen gas is EVOLVED with the formation of zinc chloride.
UPWARD ARROW in a chemical reaction indicates the evolution of a gas. It appears only on the product side and is written next to the gaseous product.
Equation balancing a. S(s) + O2(g) → SO3(8) b. 2Al(s) + 3C12(8) ► 2AICI,(s) E. 2NaOH(s) + H2SO,(ac) —Na,SO (ac) + H2O(1) d. CHg(8) + 50(8) - A 3C02(8) + 4H2O(g)
Answer:
a. S(s) + 3/2 O₂(g) → SO₃(g)
b. Al(s) + 3/2 Cl₂(g) → AICI₃(s)
c. 2 NaOH(s) + H₂SO₄(ac) → Na₂SO₄(ac) + 2 H₂O(l)
d. C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(g)
Explanation:
We will balance the equation using the trial and error method.
a. S(s) + O₂(g) → SO₃(g)
1. We will balance O atoms by multiplying O₂by 3/2.
S(s) + 3/2 O₂(g) → SO₃(g)
b. Al(s) + Cl₂(g) → AICI₃(s)
1. We will balance Cl atoms by multiplying Cl₂ by 3/2.
Al(s) + 3/2 Cl₂(g) → AICI₃(s)
c. NaOH(s) + H₂SO₄(ac) → Na₂SO₄(ac) + H₂O(l)
1. We will balance Na atoms by multiplying NaOH by 2.
2. We will balance H and O atoms by multiplying H₂O by 2.
2 NaOH(s) + H₂SO₄(ac) → Na₂SO₄(ac) + 2 H₂O(l)
d. C₃H₈(g) + O₂(g) → CO₂(g) + H₂O(g)
1. We will balance C atoms by multiplying CO₂ by 3.
2. We will balance H atoms by multiplying H₂O by 4.
3. We will balance O atoms by multiplying O₂ by 5.
C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(g)