Answer:
The answer is 0.006 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.75 \times {10}^{21} }{6.02 \times {10}^{23} } \\ = 0.00622923...[/tex]
We have the final answer as
0.006 molesHope this helps you
Answer:
6.02 * 10^23
Explanation:
(03.06 LC)
Which statement is true for dipole-dipole forces? (4 points)
Group of answer choices
They are stronger than hydrogen bonding forces.
They are weaker than London dispersion forces.
They occur between ions and polar molecules.
They occur between polar molecules.
Answer:
They are stronger than hydrogen bonding forces
Answer:
They occur between polar molecules.
Explanation:
I was answering the test and searched through my notes. This is the correct one.
Proof:
Check the attached picture.
Which is a laboratory Thermometer made of?
Mercury or Alcohol
Answer:
Mercury
Explanation:
The old school laboratory thermometers were made from the liquid metal Mercury. It is a toxic element and must be handled with care.
Nowadays, we use digital thermometers, which are safer and provide a more accurate reading.
How many orbitals does "p" have?
Answer:
three
Explanation:
Answer: 3
Explanation: The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max.
13. Kelly is the dishes and decides to unfortunately wash her mother cast iron skillet by placing it in a sink full of water. After she's done washing it and leaves it to dry on the rack, she notices it's starting to turn weird colors. After first she thinks nothing of it until her mom calls her to the kitchen a day later as she's putting the dishes up. She is holding the iron skillet and she looks very upset. She shows Kelly how the iron has changed colors and tells her the skillet is ruined. What happened to the iron skillet considering if this is a physical or chemical property and which of the Metal VS Nonmetal properties has taken place?
Answer:
The skillet got rusted.
Explanation:
In the context, Kelly kept the iron skillet in the sink which is full of water. After washing the dishes, she noticed the skillet's color is starting to change. She kept it for dry on the rack but the day later the skillet was ruined and damaged.
It was a chemical and physical change in the property of the metal where the iron skillet which was kept in the sink full of water oxidized due to the water content and the iron got oxidized to form form iron oxide which is known as rust. It damages the utensil and the color changes to muddy red or brownish red.
What is the coefficient for carbon dioxide (CO2) that completes and balances the equation below?
C6H12O6 + 6O2 à _?_ CO2 + 6H2O
1
2
6
12
Which group had the highest percentage of voter turnout for the 2008 election? A. advanced degree B. bachelor’s degree C. high school graduate D. less than 9th grade
Answer:
Republican
Explanation:
So sorry if im wrong but thus us what I remember studying
Mr. Smith wanted to see if the color of light shined on a plant had an effect on the number of leaves it had. He gathered 2 groups of the same species of plants, gave them the same amount of water, and did the test for the same amount of time. On one group of plants he used white light. For the second group he changed the light color to red.
Answer:
This question is asking to identify the following variables in the question;
Independent variable: COLOR OF LIGHT
Dependent variable: NUMBER OF LEAVES OF THE PLANT.
Constant: SAME SPECIES OF PLANT, SAME AMOUNT OF WATER
Explanation:
Independent variable is the variable that is changed or manipulated by the experimenter in an experiment. In this experiment, the COLOR OF LIGHT is the independent variable because it is the variable that was changed
The dependent variable is the variable that is measured in an experiment or the variable that responds to the changes made to the independent variable. In this experiment, the dependent variable is the NUMBER OF LEAVES OF THE PLANT.
The constant is the variable that is kept unchanged by the experimenter throughout the experiment. In this case, the SAME SPECIES OF PLANT, SAME AMOUNT OF WATER are the constants.
1. What is a fat molecule that includes oils, waxes and steroids? *
(2 Points)
protein
lipid
element
carbohydrate
different kinda
when an ato. of chlorine gains an electron it charge is niw
Answer:Again, it is more energy-efficient for chlorine to gain one electron than to lose seven. Therefore, it tends to gain an electron to create an ion with 17 protons, 17 neutrons, and 18 electrons, giving it a net negative (–1) charge. It is now referred to as a chloride ion.
Explanation:
Practice
What is the best definition of science? Choose the best answer.
Only learning through experimentation
Learning how the world works using evidence
8
Only looking at the world
A
9
Knowledge does not change - this knowledge has
been and is the same always
10
Aut
11
12
SUBMIT
13 P
Answer:
learning trough experimentation i think
Please help asap thank u
Answer: Xenon- 144
Explanation: It's D
Based on the trends you've identified, what generalizations can you make about how atoms gain or lose electrons?
Select all the correct answers.
1. Atoms with close to eight valence electrons tend to gain electrons when forming ions.
2. Atoms with only a few valence electrons tend to lose electrons when forming ions.
3. Atoms tend to gain or lose electrons such that they have eight valence electrons.
4. Atoms tend to gain or lose electrons in a way that results in the same electron configuration as a noble gas.
Answer:
All of them, see below
Explanation:
second pic
According to rule of octet, atoms gain or lose electrons so as to attain 8 electrons in valence shell. So atoms with fewer valence electrons will lose and atoms with valence electrons close to 8 will gain electrons. Thus, all the given statements are correct.
What is octet rule?Octet rule states that, atoms become stable when they achieve 8 electrons in their valence shell. As per this rule, atoms with fewer number of valence electrons or extra electrons are not stable.
Non-metals are all electron deficient. They contains valence electrons close to 8. Thus, they tends more to gain one or more electrons as per their valency to attain octet.
Similarly, metals are electron rich they contains one or two extra electrons in their valence shell and they easily lose these electrons to make the penultimate shell with 8 electrons being the the valence shell.
Noble gases in group 18 are stable since they are already having 8 valence electrons. Therefore, all the statements are correct regarding the lose/gain of electrons.
To find more on octet rule, refer here:
https://brainly.com/question/865531
#SPJ5
(True or false) all forces acting Paris
Answer:
False.
Explanation:
The answer is False that all forces acting Paris.
I hope this helps!! If so please consider marking brainliest!!All ions and isotopes of an atom share the same____
A)atomic number
B)mass number
C)radio waves
D)charge
Answer:
A atomic number
Explanation:
not too sure
when the amount of energy increases, what happens to the frequency of that wave?
Can someone help me, please?
Answer:
the answer is weak base
Are water molecules always polar or always non polar?
Answer:
hi
Explanation:
Water is a polar molecule. While the overall charge of the molecule is neutral, the orientation of the two positively charged hydrogens (+1 each) at one end and the negatively charged oxygen (-2) at the other end give it two poles.
M+ is an unknown metal cation with a plus one charge. As it dissolves the chloride of the unknown metal, MCL, in enough water to make 100 mL of solution. The student the next is a solution with excess AgNO3 solution, causing a GCL to precipitate. The student collects a precipitate by filtration
The question is incomplete; the complete question is;
M+ is an unknown metal cation with a +1 charge. A student dissolves the chloride of the
unknown metal, MCl, in enough water to make 100.0 mL of solution. The student then mixes the
solution with excess AgNO3 solution, causing AgCl to precipitate.
The student collects the precipitate by filtration, dries it, and records the data shown
below. (The molar mass of AgCl is 143 g/mol.)
Mass of unknown chloride, MCl 0.74 g
Mass of filter paper 0.80 g
Mass of filter paper plus AgCl precipitate 2.23 g
1. What is the identity of the metal chloride?
(A) NaCl
(B) KCl
(C) CuCl
(D) LiCl
Answer:
KCl
Explanation:
Mass of paper= 0.80 g
Mass of paper and AgCl=2.23
Hence mass AgCl = 2.23 - 0.80 = 1.43g AgCl
Number of moles of AgCl= 1.43g AgCl / 143g/mol AgCl = 0.01 moles AgCl
Since Ag+ and Cl- are in a mole ratio of 1:1 so:
number moles Ag+ = number moles Cl-,
Thus Ag+ has 0.01 moles and Cl- has 0.01 moles
- MCl is also in a 1:1 ratio
Hence;
number of moles of moles Cl- =number of moles of moles M+ = 0.01 moles of M+ and Cl-
Thus;
0.01 Cl- = x/35.45 = 0.3545g of Cl-
mass of MCl = 0.74g
Mass of M+ =0.74g MCl - 0.3545g Cl- = 0.3955g of M+
Number of moles of M+ =0.3955g M+/x =0.010 mol M+
x= 39.55g of M+
K+ has a molar mass of approximately 39.10
Hence KCl is the answer
Why does wood float in water and what is its density compared to water's 1.0 g/mL?
The density of wood <1 g/ml
Further explanationIf an object is put into the fluid, then there are 3 possibilities that will happen
1. floating 2. in the middle of the fluid 3. sinkFloating if the density of an object <the density of a liquid
In the middle of a fluid if the density of a liquid is the density of an object
Sink if the density of an object> the density of a liquid
Wood can float in water because it has a smaller density than water, so its density is <1 g / ml
can i get help with this dont really get it
Answer:
Number 2 is Direction
Explanation:
The old answer for number four was incorrect
I apologize for the inconvenience but I do not have an answer that fits in the lines for number 4
Some materials are phosphorescent, meaning that they can absorb light energy from the Sun, and then re-emit this energy later. Many objects people use today are phosphorescent, including glow-in-the-dark plastics. Some plastic objects have phosphorescent materials in them, which causes them to glow after they are exposed to light. In 1896, one year after x-rays were discovered, scientist Henri Becquerel hypothesized that uranium might work in this way as well. So he exposed a sample of uranium to sunlight, and then was pleased to discover that the uranium continued to emit energy even after it was taken out of the light. However, after several straight days of cloudy skies over his laboratory, Becquerel was shocked to discover that the energy kept coming from the uranium, even without sunlight. What had Becquerel accidentally discovered?
Answer:
Explanation:
After the Becquerel came to know the discovery of X-ray by Roentgen Becquerel began looking for a connection between the phosphorescence and the newly discovered X-rays. His thought was that phosphorescent uranium salts might absorb sunlight and reemit it as x rays.
To experiment this he exposed a sample of uranium to sunlight, and then was pleased to discover that the uranium continued to emit energy even after it was taken out of the light. However, after several straight days of cloudy skies over his laboratory, Becquerel was shocked to discover that the energy kept coming from the uranium,
He reported that the uranium salts emitted radiation without any stimulation from sunlight. He did further tests to confirm that sunlight was indeed unnecessary, that the uranium salts emitted the radiation on their own.
Initially he thought the effect was due to particularly long-lasting phosphorescence, but he soon discovered that non-phosphorescent uranium compounds exhibited the same effect. After that he announced that the element uranium was indeed what was emitting the radiation.
At first he also believed his rays were similar to x-rays, but his further experiments showed that unlike x-rays, which are neutral, his rays could be deflected by electric or magnetic fields which was against his expectations. Finally “Radioactivity” term was given to describe this new phenomenon.
This story of becquerel is well known example of accidental discovery.
What was the nickname given to Mendeleyev by the other chemists in Europe? Why did they give him that name?
Answer:
Low Chemist
Explanation:
A scientific name that was given to only the nobleist of its time.
what is the name for the ionic compound formed between Cu2+ and CIO2-
Which element is a metalloid?
selenium (Se)
polonium (Po)
phosphorus (P)
iodine (I)
Answer: polonium(Po)!
Explanation:
defined by the dictionary of oxford languages, a metalloid is defined as a an element (e.g. arsenic, antimony, or tin) whose properties are intermediate between those of metals and solid nonmetals or semiconductors. there are a total of 8 metalloids. Boron, silicon, germanium, arsenic, antimony, tellurium, astatine, and polonium.
Hope this helps!
Have a great day/night!
Answer:
iodine
Explanation:
im pretty sure thats the answer
If all of the atoms are made of the same three subatomic particles, then how can you
tell one element is different from another?
Answer:
they may have the same subatomic particles but always attach to another atom
Explanation:
HELP ME PLEASE!
An increase in demand for a product in a market economy will result in:
A. the price of the product increasing.
B. the supply for the product decreasing.
O
c. the scarcity of the product decreasing.
D. the opportunity cost of the product increasing.
SUBMIT
Answer:
A. the price of the product increasing
Answer: A
Explanation: I just took the quiz
Hope this helps!!
What do a light bulb, a toaster, a radio, and a computer all have in common?
Answer:
they all use electric
Explanation:
they plug into things like the light gets screwed into the thing and the rest can plug into the wall
Answer:
they all are are use electricity
Explanation: a light bulb a toaster a radio and a computer all use electricity
What is the noble gas
configuration for Tungsten?
Answer:
[Xe] 6s² 4f¹⁴ 5d⁴
Explanation:
How much energy is required to raise the temperature of a
300.0 gram block of lead from 22.3°C to 59.9°C? The specific
heat of lead is 0.129 J/gºC.
Round your answer to the nearest whole number.
Answer:
Q = 1455 J
Explanation:
Given data:
Mass of block = 300 g
Initial temperature = 22.3 °C
Final temperature = 59.9°C
Specific heat of lead = 0.129 j/g.°C
Energy required = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1 = 59.9°C - 22.3 °C
ΔT = 37.6 °C
Q = 300 g × 0.129 j/g.°C × 37.6 °C
Q = 1455 J
Which of the following lists the levels of organization from least complex
to most complex?
A: organ,organ,system,cell,tissue,organism
B: tissue,organ,cell,organ,system,organism
C:tissue,organism,organ,organ,system,organism
D: cell,tissue, organ,organ, system, organism
E:organism, organ, system, organ, tissue, cell
Answer:
the answer is e opinion
Answer: D
Explanation: the cell is the least complex, cells make tissues, tissues make organ, organs make organ systems, organ systems make organisms
