Answer:
0.025M
Explanation:
Molarity (M) = number of moles (n) ÷ volume (v)
To find the mole of CaF2, we need to find its molar mass:
Ca= 40g/mol, F=19g/mol
CaF2 = 40 + 19 (2)
40 + 38
= 78g/mol.
Using; mole = mass/molar mass
mole = 7.85/78
mole = 0.1006
mole = 0.101mol
Molarity (M) = number of moles (n) ÷ volume (v)
Volume in Litres = 4025mL/1000
= 4.025L
Molarity (M) = 0.101/4.025
Molarity = 0.025M
How many seconds are in 30 days?
Occurs when a new organism is formed from the same organism
A. Cellular asexual Reproduction
B. Regeneration
C. Budding
Answer:
C) Budding
Explanation:
Budding is define as when a new organism is formed from the same organism is known as Budding
what energy is usually associated with bond formation?
Rhonda watched a video taken by a camera that was lifted into the upper atmosphere by a weather balloon. She saw the balloon pop when it reached a certain height. Afterward, Rhonda wondered what effect the air pressure at high altitudes has on the volume of gas in balloons.
Answer:
This question is incomplete; the complete part is: What scientific practice is Rhonda performing?
The answer is ASKING A QUESTION FROM AN OBSERVATION
Explanation:
The SCIENTIFIC METHOD is used for scientific investigations. The scientific method is composed of sequential steps which scientific investigations follow. The steps are:
- Asking a question/Make an observation
- Formulating a hypothesis
- Testing the hypothesis
- Analysing the result
- Conclusion
Asking a scientific question is done after making an observation about an occurrence. In this question, Rhonda wondered what effect the air pressure at high altitudes has on the volume of gas in balloons after watching a video taken by a camera that was lifted into the upper atmosphere by a weather balloon. This illustrates that Rhonda is ASKING A QUESTION FROM AN OBSERVATION.
How many kilograms are in 1256.55 centiliters?
Answer:
12.5655
Explanation:
divide by 100
Answer:
12.5655
Explanation:
To find the answer you need to move the decimal place left two times <3
22 mL of soybean oil is diluted to 50 mL volume in a graduated cylinder. What is the percent oil by volume? Show your work for full credit
Answer:
44
Explanation:
multiply 22 x 2, and 50 x 2, so 50 x 2 would be 100 and 22 x 2 would
be 44.
Calculate the mass (in g) of 2.1 x 1020 atoms of Os.
Answer:
here's the procedure to find it friend
Explanation:
How do you find the mass in grams of an atom?
In order to determine the mass of one atom of an element, you must determine its molar mass, which is its atomic weight on the periodic table in g/mol, and you need to know the relationship between moles and the number of atoms: 1 mol of atoms = 6.022×1023 atoms . Then divide the molar mass by 6.022×1023 atoms/mol .
Which science is the study of living organisms?
PLES NEED HELP asap
chemistry
physics
biology
astronomy
Answer:
Biology
Explanation:
Answer:biology
Explanation:
How do we know the Earth is approximately 4.6 billion years old?
A 16 L sample of gas is under a pressure of 4.6 atm. What will be the pressure of the gas when the volume increases to 20 L? Assume the temperature is held constant.
Answer:
P₂ = 3.68 atm
Explanation:
Given data:
Initial volume of sample = 16 L
Initial pressure = 4.6 atm
Final pressure = ?
Final volume = 20 L
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
4.6 atm × 16 L = P₂ × 20 L
P₂ = 73.6 atm. L/ 20 L
P₂ = 3.68 atm
Which of these is the subject of study in thermodynamics? a) energy changes b) only physical changes 3) only chemical changes 4) structure of atoms and molecules
Answer:
a
Explanation:
The main subject of study in thermodynamics is the energy changes in a reaction or a system.
Generally speaking, thermodynamics is a branch of science that deals with the study of heat, work, temperature, and the energy of systems and how this energy is converted from one form to another. The subject of thermodynamics is governed by a series of laws known as the law of thermodynamics.
The correct option is a.
2.
State the purpose of physical and chemical properties
.
Answer: chemical
Explanation: Chemical changes and physical changes keep it the same.
Ethan filled 10 cups of the same size with equal amounts of water. He divided the cups into five groups of two cups each. The groups were placed in five different locations around his house. After two weeks, he measured the remaining water to determine how much had evaporated, by measuring how much water remained in each cup.
The question is incomplete, the complete question is;
Ethan filled 10 cups of the same size with equal amounts of water. He divided the cups into five groups of two cups each. The groups were placed in five different locations around his house. After two weeks, he measured the remaining water to determine how much had evaporated, by measuring how much water remained in each cup.
What is the dependent (data) variable?
A. Location of cups
B. Amount of time they were left in locations
C. Amount of evaporated water
D. Size of cups
Answer:
C. Amount of evaporated water
Explanation:
The dependent variable is the outcome that is measured or observed in an experiment. In this case, the variable that is being observed is the amount of water left in each cup.
Depending on its location, the amount of water in different locations may not be the same. Therefore, the amount of water left in each cup is regarded as the dependent variable here.
What is the definition of half-life
Answer:
the time taken for the radioactivity of a specified isotope to fall to half its original value.
Explanation:
Plz help me with the blanks on balancing numbers-chemistry
Answer:
(NH4)2Cr2O7 → N2 + 4 H2O + Cr2O3
Hope this helps :)
Which of the following is the correct equation for calculating SPEED?
Answer:
Where is the following?
Explanation:
The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time. In this example, distance is in meters (m) and time is in seconds (s), so the units will be in meters per second (m/s).
Answer:
Speed = Distance / Time
Explanation:
Distance = Speed * Time
Time = Distance / Speed
Use this chart to help you remember. Cover what you don't have. If it is next to each other, multiply. If one is on top, divide what is on top with the one on the bottom.
How are Chemicals labeled on the periodic
table? Explain.
Answer:
The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element.
what is dilution law
Answer:
Please Mark as Brainliest!!!!!!!
Explanation:
Answer is in the below image
What is the best description of molecule b in this diagram?
Answer:
B. Adenosine diphosphate
Explanation:
You already have the right answer ^^
explain how gravity will affect the growth of the plant's stem and roots
Answer:
Honestly this is the first question I’m stumped on
Explanation:
Answer:
Plants respond directly to Earth's gravitational attraction, and also to light. Stems grow upward, or away from the center of Earth, and towards light. Roots grow downward, or towards the center of Earth, and away from light. This process turns the stem so that it once again grows upward, presumably toward the light.
Explanation:
Which of the following is an example of
positive feedback?
A Regulation of blood glucose levels
B Regulation of body temperature
C Contractions in childbirth
Answer:
Regulation of body temperature
Explanation:
Help me label the words please thank you
Answer:crust, outer core, inner core, mantle
Explanation:
An ionic bond is held together by an electrostatic between what two types of elements?
metal and nonmetal atom
metal atoms only
cations
nonmetal atoms only
Why do we sweat more when we exercise rigorously?
Sweating helps you cool down and prevent you from overheating mark me brainliest plz
Explanation:
Conduction can only occur between two objects when – both objects are exactly the same temperature. Both objects are exactly the same temperature. One of the objects is made of a metal. One of the objects is made of a metal. Both objects are in physical contact with each other. Both objects are in physical contact with each other. One object is less dense than the other. One object is less dense than the other.
Answer:
Both objects are in physical contact with each other
Explanation:
Conduction refers to the flow of heat from one object to another when the both objects are in contact with each other.
Hence, before heat can flow from one object to another, the two objects must be in contact with each other. This is a key requirement before conduction can take place.
Which biomes would be found nearest to the equator
Explanation:
found near the equator usually is the tropical forest
Answer:
Tropical rain forests and savannas
Explanation:
Did the test on Edge 2021
In 20 words or fewer, explain why the statement "Dropped objects fall
toward the ground" is a law and not a theory.
Answer:
The statement is a description of something that happens, not an explanation of why it happens.
Explanation:
A px
The statement "Dropped objects fall toward the ground" is a law and not a theory given by Newton sir as he was sitting under s tree and apple falls on the earth which he observed and gravity is observed from there only.
What is the gravity?The gravity is the strongest force of attraction between the surface of the earth and in the each substance or object present on the earth.
According to the law of Newton sir the gravitational force of the earth depends on the mass of the object if the mass of object is double then the gravitational force of the earth is also double.
Therefore, statement "Dropped objects fall toward the ground" is a law and not a theory given by Newton sir as he was sitting under s tree and apple falls on the earth which he observed and gravity is observed from there only.
Learn more about gravity, here:
https://brainly.com/question/2888262
#SPJ2
Water is formed when 48g of oxygen combine with 6g of hydrogen. What mass of oxygen combines with 2g of hydrogen?
A. 12g
B. 16g
C. 96g
D. 144g
Answer:
B. 16g
Explanation:
What is the difference between a single atom and a molecule?
Answer:
Atoms are single neutral particles.
Molecules are neutral particles made of two or more atoms bonded together.
Answer:
a molecule is made up of atoms bonded together so while an atom is its own separate entity a molecule is what you get when those atoms bond together. these might be the same elements such as two oxygen Atoms bonded together (O2), or it might be different Atoms bonded together like water(H20)
A 22.5 mL sample of liquid ethanol (C₂H₅OH, density = 0.789 g/mL) was injected into a 10.0 L cylinder containing O₂ at a pressure of 4.50 atm and a temperature of 25°C. The cylinder was heated to 125°C and a spark was used to ignite the ethanol, which was completely combusted. What was the final total pressure in the cylinder (in atm) after the reaction, while it was still at 125°C?
Answer:
The final total pressure in the cylinder = 8.53 atm
Explanation:
From the information given:
The volume of liquid ethanol = 22.5 mL
The density of the liquid ethanol = 0.789 g/mL
The volume of the cylinder = 10.0 L
The pressure of the cylinder = 4.50 atm
The temperature of the cylinder = 25°C = (273.15 + 25) K = 298.15 K
Using the ideal gas equation:
PV = nRT
where n is the number of moles before the reaction:
[tex]n = \dfrac{PV}{RT}[/tex]
[tex]n = \dfrac{4.5 \ \times 10 }{0.08205 \times 298.15}[/tex]
n = 1.8395 moles
Recall that:
Density = mass /volume
Thus; the mass of liquid ethanol = (Density × volume ) of liquid ethanol
the mass of liquid ethanol = 0.789g/mL × 22.5 mL
the mass of liquid ethanol = 17.7525 g
Since we know the mass of the liquid ethanol = 17.7525 g and the standard molar mass of liquid ethanol = 46.07 g/mol
Then:
the number of moles of liquid ethanol = 17.7525 g / 46.07 g/mol
the number of moles of liquid ethanol = 0.38534 mol
The chemical equation for the reaction can be represented as:
[tex]C_2H_5OH + 3O_2 \to 2CO_{2(g)} + 3H_2O_{(g)}[/tex]
From above 1 mole of ethanol react with 3 moles of oxygen to produce 2 moles of carbon dioxide and 3 moles of water
Since each mole of ethanol reacts with 3 moles of oxygen
Then:
0.38534 mol of ethanol = (0.38534 mol × 3) oxygen
Therefore, the amount of oxygen molecule left in the cylinder after the reaction = 1.8395 mol - (0.38534 mol × 3)
= 1.8395 mol - 1.15602 mol
= 0.68348 mol
The number of moles of carbon dioxide formed = 2 × moles of ethanol
number of moles of carbon dioxide formed = 2 × 0.38534 mol
number of moles of carbon dioxide formed = 0.77068 mol
The number of moles of water vapour formed = 3 × 0.38534 mol
The number of moles of water vapour formed = 1.15602 mol
∴
The total moles of gas = moles of oxygen left + moles of water vapour + moles of carbon dioxide
The total moles of gas = 0.68348 mol + 0.77068 mol + 1.15602 mol
The total moles of gas = 2.61018 mol
Finally, to find the total pressure in the cylinder when the temperature is 125°C = (273.15 + 125)K
= 398.15 K
Then; using the ideal gas equation PV = nRT
P = nRT/V
P = ( 2.61018 × 0.08205 × 398.15 ) / 10
P = 85.2699/10
P = 8.52699 atm
P ≅ 8.53 atm
