Answer:
.757 moles of Gd is present in a sample containing 4.56x10^22 atoms of Gd.
Explanation:
Atoms --> Moles
1. Take the given number and put it over 1
(4.56x10^22 atoms/1)
2. Multiply by 6.022x10^23 to go from atoms to moles
(4.56x10^22 atoms/1) (1mol Gd/6.022x10^22 atoms)= .757223513...
3. Round by sigfigs
4.56 has three sigfigs
=.757 mols
PLEASE HELP SERIOUS ANSWERES ONLY
What weakness does the following question have? How many alligators live in the Everglades National Park?
1.The question is not answerable through observation.
2.The question cannot be answered with our current technology.
3.The question is too broad.
4.The question needs to focus more on a relationship instead of just numbers.
Answer:
4. The question needs to focus more on a relationship instead of just numbers.
Explanation:
One of the characteristic of a good research questions that the answer to that question should be able to be used to make a certain decision. Without this, the question would be considered as useless.
The answer to the question "How many alligators live in the Everglades National Park?" will not provide you with any useful information. Only non-useful fact. We need to make a little adjustment to make the answer becomes useful.
For example, Let's say that we alter the question to;
"How littering contribute to the number of Alligators that live in the Everglades National Park?'
The answer to that question will provide us with something that we can use to make a decision. Let's say we find out that littering lead to decreasing number of alligators. We can use this data to convince the legislators to increase the budget to clean up the national park.
Explanation:
What is the best method for separating food dyes
What is the maximum number of electrons possible in energy level 4?.
Answer:
I think its 32 electrons
Explanation:
im so sorry if im wrong!
Answer:
32 electrons :)
Explanation:
Choose the correct products for the double replacement reaction below. Click here to access the solubility rules to determine which product, if any, forms a solid precipitate in the reaction. PbCl2 MgSO4Upper C subscript 3 upper H subscript 8 plus upper O subscript 2 right arrow. ? Pb O2 MgCl PbMg ClSO4 PbSO4 MgCl2 Pb(SO4)2 MgCl.
MgCl₂ & PbSO₄ is the correct product for the given double replacement reaction.
What is double displacement reaction?In the double displacement reaction displacement of two substrate will take place among two reactants and formation of products takes place.
In the question, PbCl₂ reacts with MgSO₄ and displacement between the cations takes place and formation of MgCl₂ and insoluble precipitate PbSO₄ is formed.
Given reaction is represented as:
PbCl₂ + MgSO₄ → MgCl₂ + PbSO₄
According to the activity series, reactivity of Magnesium is more as compared to the lead atom. So lead is displaced by the magnesium atom and form the above given products.
Hence, option (3) is correct i.e. MgCl₂ & PbSO₄.
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Answer:
1st Question: C
2nd Question: A
Explanation:
bc i said so
In a redox reaction, which reactant is the oxidizing agent? the reducing agent?.
Answer:
An oxidizing agent is a reactant that gains electrons and that is reduced. A reducing agent is a substance that causes the reduction of another substance, meaning that the reactant is losing electrons therefore it is oxidized.
Explanation:
If a beach ball has a volume of 261 L at a temperature of 502 K, what will be the new
temperature of the balloon if the volume decreases to 176 L? Formula: V/T, -V2/T2
The new temperature of the balloon if the volume is decreased to the given amount is 338.5K.
Charles's law
Charles's law states that the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
Given the data in the question;
Initial volume; [tex]V_1 = 261L[/tex]Initial temperature; [tex]T_1 = 502K[/tex]Final volume; [tex]V_2 = 176L[/tex]Final Temperature; [tex]T_2 = \ ?[/tex]
To determine the new temperature as the volume is decrease, we substitute our given values into the expression above.
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}\\\\V_1T_2 = V_2T_1\\\\261L * T_2 = 176L * 502K\\\\261L * T_2 = 88352L.K\\\\T_2 = \frac{88352L.K}{261L}\\ \\T_2 = 338.5K[/tex]
Therefore, the new temperature of the balloon if the volume is decreased to the given amount is 338.5K.
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Explain the difference between a metal and a nonmetal
WILL GET BRAINLIEST!!!!!
Can somebody give me 2 answers and make sure there correct thx!!!
(WILL MARK BRAINLIEST)
:D
/google or whatever u can use to answer)
Answer:
The theory of Biological Evolution makes two very bold claims about living creatures: First: All living things on earth are related. They evolved from a common ancestor. Second: The evolution of living things is powered by natural processes. Things which can be studied and understood
Explanation:
In an exercise to teach students how to use an analytical balance, the instructor gives a student a one dirham coin which has been pre-weighed ( accepted value)as 4.6026 g. The weight that the student obtains for the same one dirham coin is 4.6013 g. What is the percentage error in the students' reading
Answer:
0.028%
Explanation:
From the question given above, the following data were obtained:
Accepted value = 4.6026 g
Measured value = 4.6013 g.
Percentage error =..?
Thus, we can obtain the percentage error in the student's reading as follow:
Percentage error = |measured value – accepted value|/accepted value × 100
Percentage error = |4.6013 – 4.6026| / 4.6026 × 100
Percentage error = 0.0013 / 4.6026 × 100
Percentage error = 0.13/4.6026
Percentage error = 0.028%
Therefore, the percentage error in the student's reading is 0.028%
What effect do you think boiling and freezing would have on amylase enzyme.
Answer:
boiling have an effect while freezing so not
Calculate the pOH of this solution. Round to the nearest hundredth. PH = 1. 90 pOH =.
Answer:
it's 12.10
Explanation:
pH is the potential of hydrogen ions. pOH is the potential of hydroxide ions. The pOH of this solution is 12.10.
What is pH and pOH ?pH is the potential of hydrogen ions. pOH is the potential of hydroxide ions.
It is a scale used to determine the solution's hydrogen ion ( H⁺ ) concentration. It is a scale used to determine the solution's hydroxide ion ( OH⁻ ) concentration.
The difference between the two is that [OH-] represents the concentration of [OH-] or the molarity of OH-. It basically represents the concentration of OH- that is produced when a strong base reacts with water for example. pOH is a value that represents the basicity of a solution.
pH + pOH = 14
1.90 + pOH =14
pOH = 14 - 1.90
pOH = 12.10
Thus, the pOH of this solution is 12.10.
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The bond line formula,
represents the molecular formula
A
C₂ H18
C₃H15
Answer:
C8H18
Explanation:
The end carbons have 3 hydrogen atoms each and the ones in the middle have 1 hydrogen atom each which gives. (3 x 5) + (1 x 3) = 18 hydrogen atoms
Which of these answers describes a scientific law?
A) an interesting idea based on various scientific opinions
B) a well-supported and widely accepted explanation of
nature
C) a specific relationship under given conditions in the
natural world
D) an explanation of why particular events happen in the
natural world
an explanation of why particular events happen in the natural world
What is the name of this hydrocarbon?
a) A skeletal model starts with C H 3 at the left, goes down to a valley, up to a peak, and then down again.
b) The valley and the peak have C H 3; there is also a C H 3 on a line straight down from the end of the centerline of carbons. 2,3-dimethylpentane 3,4-dimethylbutane 3,4-diethylpentane 2,3-diethylbutane
Answer:
A. 2,3-dimethylpentane
Explanation:
edge 2022
Hydrocarbons are the simplest compound containing carbon and hydrogen in their molecular structure. 2, 3 dimethyl pentane is correct.
What is hydrocarbon ?Hydrocarbons are the simplest compound containing carbon and hydrogen in their molecular structure. There are four types of hydrocarbon as follows
Alkanes, alkenes, alkynes and aromatic hydrocarbons. Alkane contai carbon carbon single bond in their structure .Alkene containing carbon carbon double bond in their structure while alkynes contain carbon carbon triple bond in their structure.
Aromatic hydrocarbon contain benzene ring in their structure. Benzene is the example of aromatic hydrocarbon. Aromatic hydrocarbons are used as paint removal and are also used as a solvents.
Thus, 2, 3 dimethyl pentane is correct . It is a hydrocarbon containing carbon and hydrogen in their structure.
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Sophia had been reading about the history of the Earth. She was surprised at the different ways geologists learn about the ages of rocks. Why is it important for geologists to use both relative and absolute ages to determine the age of rocks? A. Scientists want to learn about the age of rocks.
B. Scientists need only one way to determine the age of rocks.
C. Scientists may not be able to determine the absolute age of some rocks.
D. Scientists can tell the age of rocks using the law of superposition
Both relative and absolute ages of te rock are important because, scientists want to learn about the age of rocks.
What is rock?The rock is part of the solid part of the earth. rocks are studied by geologists in order to determine the actual age of the rock. The age of a rock can tell us a lot about the rock.
We must know that rocks tell something about the earth hence scientists want to learn about the age of rocks.
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Butane (C4H10) reacts with oxygen in the air
to form carbon dioxide and water. How many
moles of carbon dioxide can be formed from
1.25 mol butane and excess oxygen?
Taking into account the reaction stoichiometry, 5 moles of CO₂ can be formed from 1.25 mol butane and excess oxygen.
Reaction stoichiometryIn first place, the balanced reaction is:
2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₄H₁₀: 2 moles O₂: 13 moles CO₂: 8 molesH₂O: 10 molesMoles of CO₂ formedThe following rule of three can be applied: if by reaction stoichiometry 2 moles of C₄H₁₀ form 8 moles of CO₂, 1.25 moles of C₄H₁₀ form how many moles of CO₂?
[tex]moles of CO_{2} =\frac{1.25 moles of C_{4} H_{10}x8 moles of CO_{2}}{2 moles of C_{4} H_{10}}[/tex]
moles of CO₂= 5 moles
Then, 5 moles of CO₂ can be formed from 1.25 mol butane and excess oxygen.
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11. To “see” the spaces in matter, add one cup of______. The total volume is ______.two cups, since alcohol has a lot of______ between molecules, where water molecules can_______.
According to the forces of attraction, to “see” the spaces in matter, add one cup of alcohol.The total volume is less than two cups, since alcohol has a lot of spaces between molecules, where water molecules can fill.
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Is it acceptable to simply add the partial pressure of each species to determine the total pressure? why or why not?.
Can somebody please give me an answer for this question that doesn't consist of building or construction?
Answer:
to build a house you need land and people
Explanation:
How many moles are in 28.2 grams of sodium?
O 648 moles
O 1.69 moles
O 1.23 moles
O 7.38 moles
Take the given weight (28.2 g) and divide it by the atomic weight of sodium.
The atomic mass can be found under the element symbol on the periodic table. The atomic mass for sodium is 22.98 g.
28.2/22.98 = 1.23 moles
Therefore, there are 1.23 moles in sodium.
Did I do number one correctly???
Explanation:
yup you are right. The answer is 2,3- Dimethyl butane
what is the mass of an isotope with 8 protons and 7 neutrons?
Answer:
15 amu.
Explanation:
I looked it up on google.
Which element has the same electron configuration as the following:
1s22s22p63s23p64s23d104p64d25s2
The chemical equation below shows the decomposition of ammonium nitrate (NH4NO3). NH4NO3 Right arrow. N2O 2H2O A chemist who is performing this reaction starts with 160. 1 g of NH4NO3. The molar mass of NH4NO3 is 80. 03 g/mol; the molar mass of water (H2O) is 18. 01 g/mol. What mass, in grams, of H2O is produced? 9. 01 grams 18. 01 grams 36. 03 grams 72. 06 grams.
72.06 grams is the mass of produced H₂O in the given reaction.
How we calculate mass from moles?Mass of any substance can be calculated by using moles as:
n = W/M, where
W = required mass
M = molar mass
Given chemical reaction is:
NH₄NO₃ → N₂O + 2H₂O
From the stoichiometry of the reaction it is clear that:
1 mole of NH₄NO₃ = produce 2 mole of H₂O
Given mass of NH₄NO₃ = 160.1 g
Molar mass of NH₄NO₃ = 80.03 g/mole
Mole of NH₄NO₃ = 160.1 g / 80.03 g/mole = 2 moles
2 moles of NH₄NO₃ = produce 2 × 2 = 4 moles of H₂O
Molar mass of H₂O = 18.01 g/mol
So, required mass of H₂O will be calculated as:
W = 4mol × 18.01 g/mol = 72.06 grams
Hence, 72.06 grams is the mass of H₂O.
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Hey does anyone know how to find valence electrons in any periodic table element?
Answer:
Number of valence electrons = Group number of the element on the periodic table.
Explanation:
Hope that helps ^^
What is the pressure (in millimeters of mercury) inside a container of a gas connected to an open-end manometer when the level in the arm connected to the container is 203.3 mm in height lower than the level in the arm open to the atmosphere? Atmospheric pressure is 757.1 mm Hg and the density of mercury is 13.546 g/mL.
Answer:
See explanation below
Explanation:
In this case, you just need to apply the following expression:
Pc = Patm + h + d1/d2
Where:
Pc: Pressure of container
Patm: Atmospherical pressure
h: height of the arm of manometer
d1: density of gas
d2: density of mercury
You are not providing the density of the gas which is filled the container, so, let's assume we are filling this with hexane (d = 0.65 g/mL)
We have all in mm Hg so we just need to apply the above expression:
Pc = 757.1 + 203.3 * (0.65/13.546)
Pc = 757.1 + 9.7553
Pc = 766.8553 mmHg
someone please help me i dont understand how too do these
Answer:
0.55
Explanation:
When multiplying values, the number of significant figures in the answer should be the same as the number with the lowest sig figs in the problem which in this case is 2 sig figs (0.17)
3.22 * 0.17 = .5474
Rounded to 2 sig figs = 0.55
*30 POINTS*
Now build the complete circuit. Connect a wire to each end of the pair of batteries. Then add the lightbulb and the switch, using additional wires as needed. To disconnect two parts, click where they’re joined, and then click Split Junction. You can also click Reset All to start over. You’ll be successful when you can close the switch (click, hold, and drag it) and the lightbulb glows. Use the drawing tool to sketch the parts of your successful circuit.
Based on the data provided, the electric circuit is completed when the key is closed.
What is an electric circuit?An electric circuit is a complete path through which electric current flows
An electric circuit can either be:
An open circuitA closed circuit A short circuitAn electric circuit consists of :
A power source e.g. batterieswiresloads A keyTherefore, an electric circuit is completed when all the components are connected and the key closed.
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Answer:
Explanation: HAVE A GREAT DAY EVERYONE <3
i need all the answers ASAP
Answer:
explanation
Explanation:
Magnesium-
a. Solid
b. Metal
c. Natural
d. Mg
e. Alkaline earth metals
Ill answer the rest if you can mark brainliest
What is the charge
on an electron?
-1
O
+1
+2
help Sound ________ because the vibrating object makes nearby particles vibrate.
A. Intensifies
B. Travels
C. Stays still
D. Gets louder
Answer:
i think its B
Explanation:
When an object vibrates, it causes movement in surrounding air molecules. These molecules bump into the molecules close to them, causing them to vibrate as well. This makes them bump into more nearby air molecules. This “chain reaction” movement, called sound waves, keeps going until the molecules run out of energy