Answer:
C. The atomic number increase caused by two beta decays is the same as the decrease caused by one alpha decay.
Answer:
c. The atomic number increase caused by two beta decays is the same as the decrease caused by one alpha decay.
Explanation:
got it correct on quiz
Calculate the mass of aluminum that would have the same number of atoms as 6.35 g of cadmium
Answer:
1.62 g of Al contain the same number of atoms as 6.35 g of cadmium have.
Explanation:
Given data:
mass of cadmium = 6.35 g
Number of atoms of aluminum as 6.35 g cadmium contain = ?
Solution:
Number of moles of cadmium = 6.35 g/ 112.4 g/mol
Number of moles of cadmium = 0.06 mol
Number of atoms of cadmium:
1 mole = 6.022×10²³ atoms of cadmium
0.06 mol × 6.022×10²³ atoms of cadmium/ 1mol
0.36×10²³ atoms of cadmium
Number of atoms of Al:
Number of atoms of Al = 0.36×10²³ atoms
1 mole = 6.022×10²³ atoms
0.36×10²³ atoms × 1 mol /6.022×10²³ atoms
0.06 moles
Mass of aluminum:
Number of moles = mass/molar mass
0.06 mol = m/ 27 g/mol
m = 0.06 mol ×27 g/mol
m = 1.62 g
Thus, 1.62 g of Al contain the same number of atoms as 6.35 g of cadmium have.
Order the steps required to extract a dichloromethane solution with aqueous hydrochloric acid.
Transfer the "Organic Layer" back to the empty separatory funnel.
b. Add an equivalent volume of aqueous acid to the dichloromethane layer in the separatory funnel.
h. Label this beaker "Aqueous Layer".
Remove the cap.
Label the beaker "Organic Layer".
Make sure the stopcock is closed.
Repeat all steps. Drain the bottom layer into a labeled beaker.
C. Cap the separatory funnel with a glass or Teflon stopper.
e. Place the separatory funnel back in the Iron ring.
Remove the funnel from the iron ring and shake vigorously to mix the layers, periodically venting to release pressure. Drain the remaining liquid into a labeled beaker. Suspend a separatory funnel using an iron ring and ring stand. g.
Allow the layers to physically separate in the funnel. Transfer the organic (dichloromethane) layer to the funnel.
The formatting of the question is a bit scrambled: I'm not sure if there are separate steps that have been unintentionally consolidated into a seemingly discrete step, nor am I sure which letters actually correspond with which step(s). So, for clarity's sake, I treated every sentence as its own step and arranged all of them accordingly. Hopefully, you can then reorganize them according to the labeled steps as you have been provided.
Suspend a separatory funnel using an iron ring and ring stand. Make sure the stopcock is closed. Transfer the organic (dichloromethane) layer to the funnel. Add an equivalent volume of aqueous acid to the dichloromethane layer in the separatory funnel. Cap the separatory funnel with a glass or Teflon stopper. Remove the funnel from the iron ring and shake vigorously to mix the layers, periodically venting to release pressure. Place the separatory funnel back in the Iron ring. Allow the layers to physically separate in the funnel. Remove the cap.Drain the bottom layer into a labeled beaker. Label the beaker "Organic Layer". Drain the remaining liquid into a labeled beaker. Label this beaker "Aqueous Layer". Transfer the "Organic Layer" back to the empty separatory funnel. Repeat all steps.Notes:
The letters have been replaced with numbers only to clarify the order of the steps. No changes were made to the steps themselves, including any stylistic errors.A very few set of sequential steps might be interchangeable, but the steps as separated and organized above is in accordance with standard liquid-liquid extraction protocol.Determining which layers are the "organic" and "aqueous" layers (i.e., whether the organic/aqueous layer, or vice-versa, is on the bottom/top ) is a nontrivial step; for this reason, when actually doing such extractions, the beakers (or whatever vessel) into which the layers are drained at any step are sometimes labeled "top layer" and "bottom layer" in case you misidentify which layers are, in fact, the organic and aqueous layers. Oftentimes, the organic layer is on top of the aqueous layer as many common organic solvents are less dense than water. Halogenated organic solvents, like dichloromethane, are one of the exceptions, and so will generally comprise the bottom layer.Ag3PO4 what is the compound with this formula
Answer:
silver (III) phosphate
Explanation:
Ammonium sulfate, an important chemical fertilizer, can be prepared by the reaction of ammonia with sulfuric acid according to the following balanced equation:
2 NH3(g) + H2SO4(aq) → (NH4)2SO4(aq)
If a reaction vessel has 3.29 L of NH3 at 31.5°C and 22.7 atm, how many grams of H2SO4 are needed to completely react with it?
_________________ g H2SO4. Do NOT enter unit. Report your final answer with 3 SFs.
Answer:
Ammonia reacts with sulphuric acid to give the fertilizer ammonium sulphate.
Explanation:
We have unlimited wants but our resources such as time and money are limited. This concept is known as A. Scarcity B, Consumption C. Trade D. Currency
Answer:
Since human wants are unlimited, and resources used to satisfy those wants are limited - there is scarcity. Even in the US, one of the richest countries in the world, there is scarcity -- if we use our new definition of SCARCITY.
hope it helps
which is not possible sign of chemical change
A:color change
B:light given off
C:heat given off
D:a change of state
Answer:
A. color change
Explanation:
changing the color of a metal does not change its physical properties.
hope it helps.
) The valency of sodium atom is 1, what does it mean?
Answer:
The valence of sodium atom is 1. It means that the atom of sodium has 1 electron in its outermost shell.
Explanation:
Mark me as brainliest. Nepali le Nepali lai sahayog nagare kaslai garxha
Organic whole wheat flour sells in bags weighing 2.915 kilograms.
How much flour is this when rounded to the nearest tenth? Use a place value chart and number line to explain your thinking.
Answer:
2.920
Explanation:
This question tests your knowledge of approximation. If we look at the place values after the decimal point, we have, .915. This corresponds to hundredth, tenth and unit.
Since we have 9.15, in rounding it to the nearest tenth, we have to round it up to .920.
Hence, the weight of the flour to the nearest tenth is 2.920.
How many different types of elements are there in acetone C3H6O?
Answer:
3
Explanation:
Answer:
10
Explanation:
Suppose you mix Na2SO4 and KCl solutions according to the given equation.
Na2SO4 (aq) + 2 KCl(aq) + 2 NaCl(aq) + K2SO4 (aq)
What evidence of a reaction do you expect to see?
Select one:
A precipitate should form.
A gas should form.
Water should form.
Ο Ο
No reaction should occur.
Answer:
No reaction should occur
Explanation:
Water cannnot be made from the components
Nothing will be released as a gas
Both products are soluible in water therefore will not form a precipitate.
If I mix a solution of Na2SO4 and KCl, no reaction should occur.
Whether or not, a reaction occurs when two substances are mixed depends on the respective positions of the substances in the electrochemical series.
Now, we are expecting the reaction; Na2SO4 (aq) + 2 KCl(aq) + 2 NaCl(aq) + K2SO4 (aq) to occur. The big question is, between sodium and potassium, which is higher in the electrochemical series?
A little look into the image attached shows that potassium is higher than sodium in the series so the reaction is possible.
However, the both products are aqueous, they are both soluble in water hence no visible reaction occurs.
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Complete the Lewis Dot structure for the molecule H-C≡N and determine how many bonding and non-bonding electrons nitrogen has:
Answer:
I believe that in H-C≡N, Nitrogen has 4 bonding electrons and 2 non-bonding electrons.
(:
Explanation:
The two alternative chair conformations of cis-1-bromo-2-methylcyclohexane differ in their Gibbs free energy. Using the data for ΔG (Axial-Equatorial) for monosubstituted cyclohexanes at room temperature (25ºC): Axial → Equatorial Group ΔG° (kJ/mol) Group ΔG° (kJ/mol) -0.8 -5.9 -2.4 -7.3 -3.9 1,2-gauche 3.8 Calculate the absolute value of the difference in the Gibbs free energy between the alternative chair conformations. kJ/mol Which group in this compound is in axial position in the energetically preferred chair conformation? _______
Answer:
a.) 4.9kj/mol
b.) -Br group
Explanation:
first all of your question did not make mention of the groups in the table.
here it is:-
axial group ΔG°(kj/mol) group ΔG°kj/mol
CN -O.8 NH₂ -5.9
Br -2.4 CH₃ -7.3
OH -3.9 1,2-gauche 3.8
The 6 axial groups are bonded one on each carbon and also they are parallel and also alternate from up to bottom.
a.)
to get the absolute ΔG;
ΔG = -2.4-(-7.3)
= -2.4+7.3
= 4.9KJ/MOL
b.)
the axial group in this compound which is in the axial position in the energetically preferred chain conformation is the -Br group
Please check attachment for diagram
write the unit of electric charge
Answer: the electric charge is the atomic number
Find the volume in milliliters of 2.00 mol of an ideal gas at 36°C and a pressure of 1120 torr.
Use the ideal gas law and the appropriate Rvalue:
R=0.0821 atmL/mol. K
R= 8.31 kPa • L/mol •K
R= 62.4 torr • L/mol · K
mL
Answer:
V = 34430 mL
Explanation:
Given data:
Volume in mL = ?
Number of moles of gas = 2.00 mol
Temperature = 36°C (36+273= 309K)
Pressure of gas = 1120 torr
Solution:
Formula:
PV = nRT
V = nRT/P
V = 2.00 mol ×62.4 torr • L/mol · K × 309K / 1120 torr
V = 38563.2 torr • L / 1120 torr
V = 34.43 L
L to mL
34.43 L ×1000 mL / 1 L
34430 mL
HELPPPPPPPPP
50. How many joules of heat must be absorbed by 0.375 kg of water to raise its temperature by 45.0 to 70.0°C. Specific heat of water is 4.184 J/gC or 1.0 cal/gC
51. What mass of water can be heated from 25.0 to 50.0°C by the adding of 2825 Joules?(Cp of H2O=4.184 J/g °C)
Answer:
50. 54,915 J
51. 27.0 g
Explanation:
The dimensional analysis tells you how to compute these. Multiplying specific heat, J/(g·°C), by the product of mass and temperature change will give you energy.
__
50. (375 g)((70 -45) °C)(4.184 J/(g·°C)) = 54,915 J
__
51. M((50 -25)°C)(4.184 J/(g·°C)) = 2825 J
M = 2825/104.6 g ≈ 27.0 g
What is the formula weight (amu) of the molecule H2O? Use atomic masses of H and O as 1.008 amu and 16.00 amu respectively. Report answer to 4 sig figs.
Answer:
Formula weight of H₂O molecule is 18.02 amu.
Explanation:
Given data:
Formula weight of H₂O = ?
Atomic mass of H = 1.008 amu
Atomic mass of O = 16.00 amu
Solution:
Formula weight:
"It is the sum of all the atomic weight of atoms present in given formula"
Formula weight of H₂O = 2×1.008 amu + 1×16.00 amu
Formula weight of H₂O = 18.02 amu
Thus, formula weight of H₂O molecule is 18.02 amu.
1. Describe in your own words what friction is.
2. Describe how friction affected the results of your investigation.
3. Does an object travel farther on a smooth or slippery surface or on a rough surface? Why?
4. Propose another experiment that could be used to demonstrate that friction is a contact force.
10 points, please hurry.
Answer
There is much more friction on the rough surface that there is on the smooth surface.
Which type of atom will attract electrons
Answer:
nuetrons and protons
Explanation:
Explanation:
the electron pair will be attracted more strongly to the atom that has the higher electronegativity
hope it help
The table lists some compounds found in foods and their formulas.
Based on this information, which of these statements is NOT true?
CLEAR
Answer:
A
Explanation:
the number of molecule won't be twice as fructose has 12 hydrogen molecules and lactose has 22 hydrogen molecules
From the given statements, the statement saying that the number of atoms in Lactose is twice the number of atoms in Fructose is not correct. Thus option A is correct.
The given molecules in the list are Glutamine, Lactose, fructose, and Sorbitol.
The number of atoms in the following compounds is:
Glutamine = 20 atomsLactose = 45 atomsFructose = 24 atomsSorbitol = 26 atoms.Statement A says that the number of atoms in Lactose is twice the number of atoms in Fructose. The twice atoms of Fructose are 48 atoms. The number of atoms of lactose is 45.
Thus statement A is incorrect. Thus option A is correct.
For more about the atoms in a molecule, refer to the link:
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13.Surface tension is a property of
A. liquids, only
B. solids, only
С.gases and solids
D.gases and liquids
Answer:
I think it is liquid's only.
Explanation:
Answer:
Liquids only i am not sure but i think its A
Identify the noble gas that has atoms with the
same number of electrons as a chloride ion in
table salt.
Answer:
Ar
Explanation:
Chlorine has an atomic number of 17. That means that it has 17 protons and 17 electrons, thus being electrically neutral. When it gains 1 electron to form the chloride ion, the total number of electrons is 17 + 1 = 18.
Argon is a noble gas with an atomic number of 18, that is, it has 18 protons and 18 electrons.}
Then Cl⁻ has the same number of electrons as Ar.
A crest of a wave with an amplitude of 5 meters intersects the through of another wave with an amplitude of 2 meters. What is the resulting amplitude?:
A. 3 meters
B. 5 meters
C. 7 meters
D. 2 meters
A crest of a wave with an amplitude of 5 meters intersects the through of another wave with an amplitude of 2 metre . the resulting amplitude is
A. 3 meters
The resultant amplitude will be 7 meters.
We have crests of two different waves.
We have to find the resulting amplitude when both the waves intersect.
What is crest of a wave ?A crest point on a wave is the maximum value of upward displacement within a cycle.
According to the question -
Amplitude of wave 1 = 5 meters.
Amplitude of wave 2 = 2 meters.
Assuming that both waves are in phase, when the two waves which are
in-phase interfere, they interfere constructively. The final amplitude will be -
A(f) = A[1] + A[2] = 5 + 2 = 7 meters.
Hence, the resultant amplitude will be 7 meters.
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How are ionic compounds named? (APEX!)
A. A number is given in parentheses after each elements name to indicate the number of atoms
B. The name of the first element is followed by that of the second element, the latter of which ends in -ide
C. The name of each element is followed by a To indicate the number of atoms
D. A prefix is used which each elements name, and the second element is change the end in -ine
The ionic compounds are named as The name of the first element is followed by that of the second element, the latter of which ends in -ide. Hence Option (B) is the correct.
What are Ionic Compound ?
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding.
The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.
For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.
For example, KCl, an ionic compound that contains K+ and Cl- ions, is named potassium chloride.
Therefore, The ionic compounds are named as The name of the first element is followed by that of the second element, the latter of which ends in -ide. Hence Option (B) is the correct.
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What would be the result of adding one proton to an atom
Answer:
Protons carry a positive electrical charge and they alone determine the charge of the nucleus. Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number. For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium.
i hope this helps!
are all physical reactions reversible?
A) No, while some such as freezing are, others, such as breaking glass aren't.
B) Yes, every single one of them are!
Answer: answer is A
Explanation:
WILL GIVE BRANLIEST‼️
Answer:
its c
Explanation:
Answer:
The answer is.......... C!
Explanation:
Ai +O2 =Ai2O3 how many atoms of oxygen exist in this product
which physical change is endothermic
Answer:The physical changes that are endothermic are melting, vaporization and sublimation.
Explanation:
In the modern Periodic Table of the Elements, in order of what property are the elements arranged?
atomic number?
date of discovery?
number of neutrons?
Reactivity with hydrogen?
Answer:
They are organized by atomic number, hence the reason for 1,2,3,4, you get where im goin'?
Explanation:
Electro magnetic waves are blank waves
What’s the blank PLEASE HELP DUE IN 25 MINUTES!!!!
Answer:
Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. Hope it helps ;)
