Answer:
Mass = 3.24 g
Explanation:
Given data:
Number of atoms of cobalt = 3.31 × 10²² atoms
Mass of cobalt atoms = ?
Solution:
We will calculate the number of moles of cobalt by using Avogadro number.
1 mole contain 6.022× 10²³ atoms
3.31 × 10²² atoms × 1 mol / 6.022× 10²³ atoms
0.549 mol × 10⁻¹
0.0549 mol
Mass of cobalt:
Mass = number of moles × molar mass
Mass = 0.0549 mol × 58.93 g/mol
Mass = 3.24 g
How many strontium atoms would have a mass of 1.45 grams ?
6. Which example has BOTH ionic and covalent bonds? *
Answer:
It’s either A or D buttttt probably d
Explanation:
Marcellus is using distillation to obtain pure water from seawater. His apparatus is shown below. Put each label in the correct place on the diagram.
Answer:
I hope this photo can help you.
Round off 45.68 metres to one decimal place.
Answer:
45.7
Explanation:
Because if the number 1-4 then it goes down and if it 5-9 then it goes up
How many moles of oxygen are needed for the complete combustion of 29.2 grams of acetylene?
Moles of Oxygen= 2.8075 moles
Further explanationGiven
29.2 grams of acetylene
Required
moles of Oxygen
Solution
Reaction(Combustion of Acetylene) :
2 C₂H₂ (g) + 5 O₂ (g) ⇒ 4CO₂ (g) + 2H₂O (g)
Mol of Acetylene :
= mass : MW Acetylene
= 29.2 g : 26 g/mol
= 1.123
From equation, mol ratio of Acetylene(C₂H₂) : O₂ = 2 : 5, so mol O₂ :
= 5/2 x mol C₂H₂
= 5/2 x 1.123
= 2.8075 moles
PLEASE HELP ASAP
Which letter represents the moles of a formula in the reaction?
C
E
D
A
B
Answer: b should be the answer just took this test
Explanation:
Can someone help me with this?
Answer:
Its Vog
Explanation:
In general, what is the trend in atomic radius as atomic number increases in a vertical column on the periodic table?
Answer:
In general, the trend in atomic radius as the atomic number in a vertical column of the periodic table increases is to increase.
Explanation:
The atomic radius represents the distance between the nucleus and the valence shell (that is, the outermost). By means of the atomic radius it is possible to determine the size of the atom.
In groups, the atomic radius increases with the atomic number, that is, down a column. This is because as the atomic number of the elements in a group increases, the number of occupied levels increases, while the effective nuclear charge on the outermost electron is the same. Consequently, the atomic radius increases.
In other words, when you go down in a group (column) of the periodic table, the effective nuclear charge increases, but the number of electrons added with respect to the previous element, the same group increases in a complete shell. The effect of adding new electronic shells is predominant, so they are increasingly distant from the atomic nucleus and the atomic radius is greater when you go down in a group.
So the increase in atomic radius as you go down in a group is due to the increase in electron shells.
How many moles of nitrogen are in 9.82x10^23 formula units of nitrogen? Please show work!
Answer:
1.63 mols
Explanation:
to convert mols to formula unit, or formula unit to mols, u need the avagadros number which is 6.022*10^23 and the number of mols/formula units
so since the given is formula units, u just have to divide the number by 6.022*10^23 to get the amount of mols
9.82*10^23 / (6.022*10^23) = 1.63 mols
*be careful for sig figs
Which kind of molecular shape will this molecule have? H-S-H
Answer:
the molecule is formed by covalent bond , and each hydrogen atom forms a single bond with sulphur atom.
the difference between Ionic and Covalent bonding.
A gas with a volume of 2 L at 25°C is placed into a container that is 4 L. What is the new temperature of the gas?
Given :
A gas with a volume of 2 L at 25°C is placed into a container that is 4 L.
To Find :
The new temperature of the gas.
Solution :
Since, their is no information regarding pressure. We will assume that pressure is constant.
Now, we know when at constant pressure, volume is directly proportional to volume.
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\\dfrac{2}{4} = \dfrac{25 + 273 }{x}\\\\x = 2 \times ( 25 + 273 )\\\\x = 596\ K[/tex]
Therefore, the new temperature of the gas is 596 - 273 K = 323 K.
I'd love some help please thank you
Answer:
the answer would be B
Explanation:
The move vigorously it is the higher the reactivity so if you put it in order the answer would be B
C.
[2]
Name another chemical which can be used to test for the present of water and state the
colour change.
Answer:
See explanation
Explanation:
There are two chemicals commonly used to test for water. They are;
CuSO4: Anhydrous CuSO4 is white in colour, when it absorbs moisture, its colour changes from white to blue.
CoCl2: Anhydrous CoCl2 is blue in colour. when it absorbs moisture, its colour changes from blue to pink.
4. Which type of bond will form between a calcium atom and a sulfur atom?
Answer:ionic
Explanation: ionic bond formation
In the ionic bond formation between calcium and sulfur, a calcium atom donates two valence electrons to a sulfur atom to form a Ca2+ ion and an S2+ ⁻ ion.
Bill is pushing a box with 10 N of force to the left, while Alice is pushing the box with 30 N of force to the right. What is the net force?
Answer:
Fnet = 20 Newton
Explanation:
Let the force applied by Brian be Fb.
Let the force applied by Alice be Fa.
Given the following data;
Force, Fb = 10N
Force, Fa = 30N
To find the net force, Fnet;
Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.
Mathematically, net force is given by the formula;
[tex] Fnet = Fapp + Fg[/tex]
Where;
Fnet is the net force Fapp is the applied forceFg is the force due to gravitationSince the two force applied to the box are acting in opposite direction, we would subtract their values to find the net force.
Fnet = Fa - Fb
Fnet = 30 - 10
Fnet = 20 Newton
i need help with these. its balancing. the blank spaces are where u put the numbers. and the stuff on the sidd is how u show work. i got lost and dont know what comes next
A car emits 411g of carbon dioxide gas in 1 mile of driving. How many liters of carbon dioxide emit at STP?
The volume of Carbon dioxide at STP = 209.22 L
Further explanationGiven
411g of Carbon dioxide gas
Required
The volume of Carbon dioxide
Solution
mol of Carbon dioxide :
= mass : MW CO₂
= 411 g : 44 g/mol
= 9.34
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.
So for 9.34 mol :
= 9.34 x 22.4 L
= 209.22 L
as time goes on specimens in the fossil record become more
a-complex
b-common
c-confusing
d-simple
Answer:
complex
Explanation:
becaause it fits in the words equation I hoped i helped
Reasons
4
4
K
Glven: N is the midpoint of JL;
N is the midpoint of KM;
JL = KM
N
Prove: KN = NL
M
Statements
Reasons
1.
N is the midpoint of JL;
N is the midpoint of KM;
JL = KM
1. Given
2.
JN = NL;
KN = NM
2.
3.
3. Segment Addition Postulate
4. KN + NM = JL
4.
5.
5. Transitive Property
6. KN + KN = NL + NL
6.
7.
7. Simplify
8. KN = NL
8.
Gina Wilson (All Things Algebra). 20
Answer:
(1) The two column proof is presented here as follows;
Statement [tex]{}[/tex] Reasons
1. C is the midpoint of [tex]\overline {AE}[/tex] [tex]{}[/tex] Given
B is the midpoint of [tex]\overline {AC}[/tex] [tex]{}[/tex]
D is the midpoint of [tex]\overline {CE}[/tex] [tex]{}[/tex]
2. AC = CE, AB = BC, CD = DE [tex]{}[/tex] Definition of midpoint
3. AB + BC = AC, CD + DE = CE [tex]{}[/tex] Segment addition postulate
4. CD + DE = AC [tex]{}[/tex] Substitution property of equality
5. AB + BC = CD + DE [tex]{}[/tex] Substitution property of equality
6. BC + BC = CD + CD [tex]{}[/tex] Substitution property of equality
7. 2·BC = 2·CD [tex]{}[/tex] Addition of two identical quantities
8. BC = CD [tex]{}[/tex] Division property of equality
9. BC ≅ CD [tex]{}[/tex] Definition of Congruence
(2) The two column proof for the triangular geometric figure is presented here as follows;
Statement [tex]{}[/tex] Reasons
1. 2·WV = XY; 2·YZ = XW; WV = YZ [tex]{}[/tex] Given
2. 2·WV = 2·YZ [tex]{}[/tex] Multiplication property
3. XY = XW [tex]{}[/tex] Substitution Property
4. XW + WV = XV [tex]{}[/tex] Segment Addition Property
XY + YZ = XZ
5. XW + WV = XV [tex]{}[/tex] Substitution Property
XW + WV = XZ
6. XV = XZ [tex]{}[/tex] Substitution Property
Explanation:
Neeeeeeeedddddd hellllllllllppppppp
Plz help me with is thank you
A.4.0m/s
B.4.8m/s
C.5.6m/s
D.6.4m/s
I've been stuck with this for like an hour, please help.
A 100 gram sample of HG is equal to how many moles of the metal?
Explanation:
Molar mass of Hg = 200.59g/mol.
Therefore Moles = Mass / Molar mass
= 100g / (200.59g/mol) = 0.499mol.
calculate the quantity of electricity obtained from 2 moles of electrons
The quantity of electricity : 2 Faraday = 193000 Coulomb
Further explanationGiven
2 moles of electrons
Required
The quantity of electricity
Solution
According to Faraday, the amount of current flowing in the electrolysis cell is closely related to the amount of substance that reacts
1 Faraday is the amount of electricity that is passed in the electrolysis cell to obtain 1 mole of electrons. 1 mole of electrons is equivalent to an electric charge of 96500 Coulombs.
The conversion / relationship can be stated as follows:
1 Faraday = 1 mole of electrons = 96500 Coulombs
1 faraday = coulomb / 96500
Can be formulated
Coulomb = Q = I. t so:
[tex]\large {\boxed {\bold {1 \: Faraday \: = \: \dfrac {i \: x \: t} {96500}}}}[/tex]
so for 2 moles electrons :
= 2 x 96500 C
= 193000 C
= 2 Faraday
The asthenosphere is the part of the upper mantle just below the lithosphere that os involved in the plate tectonic movement anf isostatic adjustments during as the ice age
Answer:C
Explanation:
Answer:
It's B I promise you
How much current is drawn by a 40-W bulb in a 120-V circuit?
*Fill in the blank about the periodic table*
Atomic number equals the number of ______ or ______
Atomic mass equals the number of _____ + ______
Atomic number equals the number of protons or electrons. Atomic mass equals the number of protons and neutrons
What is a quantum of energy?
Answer:
In chemistry and physics, quantum refers to a single packet of matter or energy. In practical use, it refers to the minimum amount of energy required for a change or the minimum value of any physical property in an interaction. Quantum is the singular form of the word. Quanta is the plural form of the term.
Explanation:
Answer:
quantum of energy
Explanation:
The term quantum of energy means that the energy is not transferred continuously but as discrete packets of energy. Amount of energy required to move an electron from one energy level to another. The amount of energy an electron gains or loses is. Not always the same. The higher energy levels are.
hope it helps!
Ducks and geese have small, fluffy feathers called "down."
How does down help these birds survive?
Answer:
it helps them fly (A)
Explanation:
Answer:
strengths wings?
Explanation:
If I'm right, please give brainliest?
Please help me, Thank you!
Answer:
Fe³⁺
Explanation:
When Fe²⁺ loses an electron, it becomes an Fe³⁺ ion.
The loss of an electron in an atom makes the atom becomes positively charged. Further losing electrons makes the atom more positive.
For the given ion;
Fe²⁺ if it loses an electron more, it becomes Fe³⁺.
The expression is given as:
Fe²⁺ → Fe³⁺ + e⁻
