Answer:
EZ
in my knowledge
Option C Nazca
How many moles are represented by 9.34 x 1021 sodium atoms
a. 1.25x10^2 moles
b. 1.55x10^3 moles
c. 1.55x10^2 moles
d. 1.55 moles
Answer:
1.55×10⁻² moles of sodium
Explanation:
Given data:
Number of atoms of sodium = 9.34×10²¹ atoms
Number of moles of sodium = ?
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
9.34×10²¹ atoms × 1 mol / 6.022 × 10²³ atoms
1.55×10⁻² mol
which of the following organisms is not considered a polinator
A compound formed during the incomplete combustion of plastics shows the following percentage composition:
44.76 % C
1.25 % H
44.05 % CI 994 % O
The molar mass is known to be 321.97 g/mol. Determine the empirical formula and the molecular formula for this compound
The empirical formula : C₆H₂Cl₂O
The molecular formula : C₁₂H₄Cl₄O₂
Further explanationGiven
The percentage composition
Required
The empirical formula and the molecular formula
Solution
The mol ratio of the components :
C : H : Cl : O
=44.76/12 : 1.25/1 : 44.05/35.5 : 9.94/16
=3.73 : 1.25 : 1.241 : 0.621 divide by 1.241
= 3 : 1 : : 1 : 0.5 x 2
= 6 : 2 : 2 : 1
The empirical formula : C₆H₂Cl₂O
(Empirical formula)n=molecular formula
(C₆H₂Cl₂O)n=321.97
(160.986)n=321.97
n=2
(C₆H₂Cl₂O)₂=C₁₂H₄Cl₄O₂
The molecular formula : C₁₂H₄Cl₄O₂
How does Chemistry prepare you, in your career?
Answer:
Chemistry provides an excellent foundation for careers in a variety of professions and occupations in academia, government, and industry, and in diverse fields such as environmental sciences, pharmaceuticals, medicine, materials, energy, oceanography, education, health, aerospace, law, and education.
Explanation:
Answer: Hi friend! Sorry if I'm incorrect but Chemistry can prepare you for many careers. Specifically in the scientific area.
Explanation:
If you're studying to get a Chemistry major. I think chemistry shows a way of objectifying and trying to find reasons in order to solve real world application problems. When you think about it chemistry is a guide to showing you current events, such as environment and technological advances.
The ____________ controls the materials that move into and out of a cell.
cytoplasm
cell membrane
nucleus
Answer:
membrane
Explanation:
its semi permiable meaning it only lets certain things go in and out
Answer:
The cell membrane controls the materials that move into and out of a cell.
Explanation:
The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells.
I hope this helps!
Question 22 (1 point)
An element that is written with the formula X2 is a(n)
a diatomic element
b noble gas
С transition metal
d alkali metal
Answer:
im pretty sure its b
Explanation:
What is the smallest substance?
A. mixture
B. atom
C. compound
Answer:I believe it is B. Atom,
Explanation:
Answer:
B. Atom
Explanation:
Compounds and mixtures are to big compared to an atom.
The ability of a substance to conduct electricity is called_______
Answer:
Electrical conductivity
Explanation:
Electrical conductivity - A material's ability to conduct electricity
Look at the diagram shown below. Name the scientist who created this early attempt at a periodic table.
Group
1
IV
V
VI
Vi
VIR
H
LI
Be
B
C с
N
o
Na
Mg
A
Si
P
S
d
K
Са
?
Ті
V
Mn
Fe, Co,
NI, CU
Answer:
Russian chemist Dmitri Mendeleev
Explanation:
Russian chemist Dmitri Mendeleev
The scientist who created this early attempt at a periodic table is Russian chemist Dmitri Mendeleev.
What is periodic table?
Periodic table is defined as an arrangement of all the elements known to man in accordance with their increasing atomic number and recurring chemical properties.
It can also be defined as an organized arrangements of the 118 known chemical elements.
Dmitri Mendeleev is the first scientist who is famous for his discovery of periodic law and periodic tables. He also launched organic chemistry book.
Thus, the scientist who created this early attempt at a periodic table is Russian chemist Dmitri Mendeleev.
To learn more about periodic table, refer to the link below:
https://brainly.com/question/11155928
#SPJ2
Calculate the mass percent of calcium chloride in 1.00g of Calcium Chloride in 19.0 g of water
Answer:
5.26%
Explanation:
Given parameters:
Mass of calcium chloride = 1g
Mass of Water and calcium chloride = 19g
Unknown:
Mass percent of calcium chloride in the water solution = ?
Solution:
To solve this problem, we express the given mass of the calcium chloride as a percentage of the solution.
Mass percent of calcium chloride = [tex]\frac{1}{19}[/tex] x 100 = 5.26%
The mass percentage of calcium chloride is 5.26%
Which statement below is the most accurate description of the location of subatomic particles?
The protons and electrons are located in the nucleus, while the neutrons are located in a cloud outside the nucleus
The protons and electrons are located in the nucleus, while the neutrons are located in a cloud outside the nucleus
The neutrons and electrons are located in the nucleus, while the protons are located in a cloud outside the nucleus.
The neutrons and electrons are located in the nucleus, while the protons are located in a cloud outside the nucleus.
The electrons are located in the nucleus, while the protons are neutrons are located in a cloud outside the nucleus.
The electrons are located in the nucleus, while the protons are neutrons are located in a cloud outside the nucleus.
The protons and neutrons are located in the nucleus, while the electrons are located in a cloud outside the nu
Answer:
the last one is correct
Explanation:
Answer: The protons and neutrons are located in the nucleus, while the electrons are located in a cloud outside the nu
Explanation: The protons and neutrons are located in the nucleus, while the electrons are located in a cloud outside the nu
A student walks 50 m north, stops, and then travels 32 m south. What is her displacement?
Her displacement = 18 m
Further explanationGiven
walks 50 m north and 32 m south
Required
displacement
Solution
Displacement shows vector motion that has magnitude and direction.
Displacement only looks at the distance between the starting point and the end point
Because it takes direction into account, a positive or negative sign is required
We determine that in vertical motion the upward direction is positive and the downward direction is negative
While the horizontal movement to the right is positive and the left has a negative sign
Students moving north (from the starting point) are moving positively by + 50 m
then moving south which means moving negative as far as -32 m
So that the displacement is
[tex]\tt 50-32=18~m[/tex]
Give reason
why Iron is not found in a free state?
Answer:
Iron is in nature in the form of its compounds… it is not as a free element.
does this help?
IF CORRECT I WILL GIVE BRAINLIEST
Which statements prove a chemical reaction took place?
(there is more than one answer)
A. A student leaves a clear liquid out on the counter. In the morning, only a white solid remains
B. A student bends a glow stick to mix materials, it produces light
C. Thermal energy is added to a liquid substance until it bubbles and turns into a gas
D. Two room-temperature substances are mixed together, and the mixture becomes cold
Answer:
The correct answers are B and C
I NEED HELP! The quarter is ending for me tomorrow and I have to have this in, please help if you can.
Answer:
The answer is B
8 gm of pure calcium is treated with 50 gram of pure Hcl to give cacl2 and h2 .which is limiting reactant?
Ca as a limiting reactant
Further explanationGiven
8 g Calcium
50 g HCl
RequiredLimiting reactant
Solution
Reaction
Ca + 2HCl → CaCl₂ + H₂
mol Ca (Ar = 40 g/mol) :
= mass : Ar
= 8 g : 40 g/mol
= 0.2
mol HCl (MW= 36.5 g/mol) :
= mass : MW
= 50 g : 36.5 g/mol
= 1.37
Mol : coefficient reactants :
Ca = 0.2/1 = 0.2
HCl = 1.37/2 = 0.685
Ca as a limiting reactant(smaller ratio)
A sample of argon gas collected at a pressure of 0.918 atm and a temperature of 279 K is found to occupy a volume of 719 milliliters. How many moles of Ar gas is in the sample?
mol
Seawater is 3.5% Sodium Chloride by mass. Sea Salt can contain about 10 % water.
How much water is removed from every Kilogram of Commercial Sea Salt?
10g water is removed from every Kilogram of Commercial Sea Salt
Answer:
900 g
Explanation:
90% of 1000 g is 900g
Which best describes the storage of the genetic code?
Answer:
A
Explanation:
A gene is a segment of DNA, a condensed DNA molecule makes up a chromosome, a chromosome is inside a nucleus, and a nucleus is contained within a cell.
How many molecules are in 10 moles of Hydrogen?
Answer:3.2
Mass:32
Molecular weight: 10
Moles: 3.2
I NEED HELP! The quarter is ending for me tomorrow and I have to have this in, please help if you can.
Answer:
Medium is the answer
which element would lose electrons during ionic bonding choose all that apply
mg
li
ca
cs
Answer:
All of them!
Explanation:
Since Mg, Li, Ca, and Cs are all in groups 1 and 2 of the periodic table, they are alkali/alkaline earth metals and will all lose electrons during ionic bonding.
Question 18 of 35
Which statement describes a species adapting to changes in its
environment?
O A. Dark-colored moths become common after tree trunks become
dark.
B. Tree trunks turn dark when people burn large amounts of coal.
O C. Large numbers of dark-colored and light-colored moths hatch in
forests each year.
O D. Light-colored moths are hard to see on light-colored tree trunks.
SURMET
I’m
Answer:
A. Dark-colored moths become common after tree trunks become
dark.
Explanation:
I took the test
Answer:
A
Explanation:
Same
How can you tell one element from another?
Some metals are found as uncombined elements,
but most metals are extracted from ores found in
the Earth's crust. Different metals are extracted
using different methods.
Explain how the method used to obtain a metal is
related to its position in the reactivity series and to
the cost of the extraction process. In your answer,
refer to aluminium, iron and gold as examples.
(6 marks)
Answer:
no idea
Explanation:
What is the theoretical yield of Ca(OH)2, in grams, if 31.8 g of CaO is hydrolyzed (reacted) in an excess of water?
The theoretical yield of Ca(OH)₂ : 42.032 g
Further explanationGiven
31.8 g of CaO
Required
The theoretical yield of Ca(OH)₂
Solution
Reaction
CaO + H₂O⇒Ca(OH)₂
mol CaO (MW=56 g/mol) :
= mass : MW
= 31.8 g : 56 g/mol
= 0.568
From equation, mol Ca(OH)₂ = mol CaO = 0.568
Mass Ca(OH)₂ (MW=74 g/mol) :
= 0.568 x 74
= 42.032 g
How many significant figures are in 114.01
Convert 101 kilocalories into kilojoules.
Answer:
422.584 kilojoules.
Explanation:
Easy, just know you stuff and you'll understand.
HELP ILL GIVE BRAINLIEST
An epicenter station that records seismic waves is 7,000 km
away from the earthquake epicenter. How long after the first
P-wave did the first S-wave arrive?
Answer:
8.7min
Explanation:
The epicenter is the origin of an earthquake wave.
Since the distance between the earthquake origin and the station is 7000km and we are told to find the time after which the s - wave arrives from that of the p- waves, we follow the procedure below:
we use the graph of the travel time - distance giventrace the 7000km as the distance and find where it cuts the p-wave curve. the point is 10.3min trace it up to where 7000km intersects the s-wave curve which is at 19minSo;
The time difference = 19min - 10.3min = 8.7min
After the p-waves arrived, it took the s-waves 8.7min to reach the station.
Answer:
8.7min
Explanation:
The epicenter is the origin of an earthquake wave.
Since the distance between the earthquake origin and the station is 7000km and we are told to find the time after which the s - wave arrives from that of the p- waves, we follow the procedure below:
we use the graph of the travel time - distance given
trace the 7000km as the distance and find where it cuts the p-wave curve.
the point is 10.3min
trace it up to where 7000km intersects the s-wave curve which is at 19min
So;
The time difference = 19min - 10.3min = 8.7min
After the p-waves arrived, it took the s-waves 8.7min to reach the station.
plz mark me as brainliest.
Can O and N form a covalent bond?
Answer: Yes
The bonds between nitrogen and oxygen are covalent bonds made from sharing electron pairs.
Answer:
allimorales is correct
Explanation:
