A student is trying to determine the identity of some pieces of an unknownsubstance by finding their density. He finds the mass of a weighing boat to
be 2.69 g and the mass of the unknown pieces, including the weighing
boat, to be 18.01 g. To find the volume of the pieces, he measured out 25.7
mL of water in a graduated cylinder and then added the pieces to find a
new volume of 32.3 ml. What is the identity of the substance?
Density
2.16
Mineral
Halite
2.32
Gypsum
Quartz
2.65
2.72
Calcite
3.18
Fluorite
O halite
O quartz
O
O gypsum
fluorite
juju
Answers
The material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.
Density can be defined as the mass of the substance per unit volume.
To calculate the density of the unknown piece, the mass has been calculated as:
Mass of unknown piece = Mass of weighing boat with the unknown piece - Mass of weighing boat
Mass of unknown piece = 18.01 g - 2.69 g
Mass of unknown piece = 15.32 grams.
The volume of the unknown piece can be calculated as:
The volume of unknown piece = Final volume - Initial volume
The volume of the unknown piece = 32.3 mL - 25.7 mL
The volume of the unknown piece = 6.6 mL.
The density can be expressed as:
Density =
The density of the unknown piece =
The density of the unknown piece = 2.32 g/mL.
From the given set of pieces, the material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.
For more information about density, refer to the link:
Answer : The identity of the substance is gypsum.
Explanation : Given,
Mass of weighing boat = 2.69 g
Mass of unknown pieces including weighing boat = 18.01 g
Initial volume = 25.7 mL
Final volume = 32.3 mL
First we have to calculate the mass of unknown pieces.
Mass of unknown pieces = Mass of unknown pieces including weighing boat - Mass of weighing boat
Mass of unknown pieces = 18.01 g - 2.69 g
Mass of unknown pieces = 15.32 g
Now we have to calculate the volume of unknown pieces.
Volume of unknown pieces = Final volume - Initial volume
Volume of unknown pieces = 32.3 mL - 25.7 mL
Volume of unknown pieces = 6.6 mL
Now we have to calculate the density of unknown pieces.
Now putting all the given values in this formula, we get:
From the given table we conclude that the unknown piece is gypsum whose density is 2.32 g/mL.
Therefore, the identity of the substance is gypsum.
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Answers
Answer : The number of moles of isopropanol are 1.308 moles.
Solution : Given,
Mass of isopropanol = 78.6 g
Molar mass of isopropanol = 60.1 g/mole
Formula used :
Now put all the given values in this formula, we get the number of moles of isopropanol.
Therefore, 1.308 moles of isopropanol are contained in this sample.
78.6 g ( 1mol / 60.1g) = 1.31 mol isopropanol
Answers
Answer: 2.93 L
Explanation:
AI-generated answer
To find the volume occupied by 0.108 mol of helium gas at a pressure of 0.909 atm and a temperature of 306 K, we can use the ideal gas law equation:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Rearranging the equation to solve for V:
V = (nRT) / P
Plugging in the given values:
n = 0.108 mol
R = 0.0821 L·atm/(mol·K) (the ideal gas constant)
T = 306 K
P = 0.909 atm
V = (0.108 mol * 0.0821 L·atm/(mol·K) * 306 K) / 0.909 atm
Calculating this expression, we find that the volume occupied by 0.108 mol of helium gas at a pressure of 0.909 atm and a temperature of 306 K is approximately 2.93 L.
Now, let's consider the second part of the question: Would the volume be different if the gas was argon (under the same conditions)?
The volume would be the same for argon gas.
According to the ideal gas law, at the same temperature, pressure, and number of moles, the volume occupied by a gas is the same regardless of the gas's identity. Therefore, if we replaced helium gas with argon gas while keeping the same conditions of pressure, temperature, and number of moles, the volume occupied by argon gas would be the same, approximately 2.93 L.
b. size and stability
c. magnitude and direction
d. strength and magnitude
Answers
Answer: option c. magnitude and direction
Explanation:
1) Force is a vector: it has magnitude and direction.
2) Magnitude measures the "intensity" of the force. It is measured in newtons (N), in the SI (international system of units). One newton is the force exerted to confere an acceleration of 1 m/s² to a mass of 1 kg.
3) Telling the magnitude of the force is not enough information to understand what the force is and to predict its effect.
It is necessary to tell the direction in which the force is applied.
It is not the same a force of 10 N that pulls that the same magnitude pushing. And it is not the same a hhorizontal force of 100 N to move an object, than the same magnitude applied at an agle.
That is why the force must be measured and reported as a magnitude and a direction.
4) Examples of forces correctly reported are:
i) 100 N vertically upward
ii) 1000 N 20° to the east of the north.
iii) 0.2 N with an elevation angle of 50°.
Then, scientists must measure the magnitude and the direction of the force.
It is the magnitude and the direction that the scientist considered to measurethe aspect of force.
=> Magnitude can be describe in 3 terms.
In mathematics it is considered as the relative size of an object.
IN Astronomy, it is considered as the measure of brightness and differences ofbrightness in astronomy study
And in earthquake, it is a measure of the energy of earthquake.
=> Direction is a course or anexplicit instruction where a certain object move.
Answers
The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
What is Alchemy ?
Alchemy began to fully evolve into chemistry in the 17thcentury, with a greater emphasis on rational thought and experimentation and less emphasis on spirituality and mysticism.
The alchemists were never successful in changing lead into gold, but modernnuclear physics can accomplish this task.
Therefore , The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
Learn more about Alchemy here ;
#SPJ2
B. It is the most abundant element
C. It can react with both metals and nonmetals
D. It can form stable compounds with other elements
Answers
Isotopes of an element have nuclei with the same number of protons and the same number of neutrons.
Isotopes of an element have nuclei with a different number of protons, but the same number of neutrons.
Isotopes of an element have nuclei with a different number of protons, but the same number of electrons.
Answers
Answer:isotopes of an element has same number of proton but different number of neutron.
Explanation:
Isotope: The atoms of element having same atomic number but different mass number are called isotope.
Hydrogen has three isotopes called as
1.protium
2.duetrium
3.tritium
All of the isotopes of hydrogen have same atomic number but different masses 1,2,3 respectively.
Isotopes have same outermost shells there for having same chemical properties.
Isotopes have different nuclie due which they have different physical properties.
Tritium the 3rd isotop having diffrent prton to neutron ration emitts radiation there it in traces.
Answer: its neutrons
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