Answer:
Mass = 22.725 g
Explanation:
Given data:
Mass of potassium nitrate required = ?
Volume of solution = 3.00 ×10² mL
Molarity of solution = 0.750 M
Solution:
Formula:
Molarity = number of moles of solute / L of solution
Now we will convert the volume into L.
3.00 ×10² mL × 1L /1000 mL
0.003 ×10² L or 0.3 L
now we will put the values in formula.
0.750 M = n / 0.3 L
n = 0.750 M × 0.3 L
M = mol/L
n = 0.225 mol
Mass of potassium nitrate:
Mass = number of moles × molar mass
Mass = 0.225 mol × 101 g/mol
Mass = 22.725 g
Please HELP HELP ME!!!
The splitting of the nucleus of an atom to produce energy is called _____ ?
A. geothermal energy
B. nuclear fission
C. nuclear fusion
D. hydroelectric power
Answer:
Explanation:
B . Is the correct answer
someone help me please, I will give you brainliest
Answer:
conserve mass.
Explanation:
What is the density at 27 °C of 28.0 milliliters of a liquid that has a mass of 4.05 grams?
Answer:
4.05/28=0.144g/ml
Explanation:
This is not a multiple choice question
How much a material takes time to burn?
Need Variables for the Experiment
(a) Independent Variable:
(b) Dependent Variable:
(c) Constant Variable:
(a)- Time
(b)- Heat produced(i guess)
(c)- Material
this is what I think, hope it helps
PLZ DON"T JUST PICK AN ANSWER I REALLY NEED HELP
5. Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remains, about how much time has passed?
A. 15 hours
B. 30 hours
C. 45 hours
D. 60 hours
Answer:
60 hours
Explanation:
18.0 __15__ 9 __15__ 4.5 __15__ 2.25 __15__ 1.125g
15(4)= 60
Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remain , then it has been passed in 60 hours. So option D is correct.
What is half life and decay law ?The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T₁ ÷ 2, and the decay constant is given by T₁/2 = 0.693/λ
According to radioactive decay law, the rate of decay of radioactive atoms at any instant is directly proportional to the number of atoms present at that instant.
dtd N ∝ N
dtd N = λ N
where, N is number of integrated nucleus present in the sample at any time t and λ is decay constant.
Thus ,option D 60 hours is correct.
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Weighted averages, help please
Answer:
Average atomic mass of Cl = 35.48 amu
Average atomic mass of B = 10.8 amu
Average atomic mass of Ag = 107.96 amu
Explanation:
1)
Given data:
Abundance of Cl-35 = 75.8%
Abundance of Cl-37 = 24.2%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (75.8×35)+(24.2×37) /100
Average atomic mass = 2653 + 895.4 / 100
Average atomic mass = 3548.4 / 100
Average atomic mass = 35.48 amu
2)
Given data:
Abundance of B-10 = 19.8%
Abundance of B-11 = 80.2%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (19.8×10)+(80.2×11) /100
Average atomic mass = 198 +882.2 / 100
Average atomic mass = 1080.2 / 100
Average atomic mass = 10.8 amu
3)
Given data:
Abundance of Ag-107 = 52%
Abundance of Ag-109 = 48%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (52×107)+(48×109) /100
Average atomic mass = 5564 +5232 / 100
Average atomic mass = 10796 / 100
Average atomic mass = 107.96 amu
give an example how we use science in our every day life
Answer: When you turn a light on it becomes bright :)
In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. Manually operated on/off switches may be substituted by dimmer switches that allow controlling the brightness of lamps as well as turning them on or off, time-controlled switches, occupancy-sensing switches, and remotely controlled switches and dimmers. Light switches are also found in flashlights, vehicles, and other devices.
If Beryllium has a mass number of 7 and atomic number of 4, how many protons does it have?
Answer:
4
Explanation:
Answer:
4
Explanation:
So the atomic number is still the proton number and it is always smaller than the atomic mass so the proton number is 4.
HOPE IT HELPED
please help me quickly
Answer:
tell me the question i cant see the picture
Explanation:
a solid that is formed during a chemical reaction, typically solution
Answer:
precipitate
Explanation:
pretty sure it's right but sorry if i'm wrong:)
What is generally true about the particles in a gas?
A. Gas particles are closer together and have stronger attraction between them than the particles in a solid.
B. Gas particles are closer together and able to conduct electricity better than the particles in a plasma.
C. Gas particles are farther apart and able to conduct electricity better than the particles in a liquid.
D. Gas particles are farther apart and have weaker attraction between them than the particles in a solid.
Answer:
D
Explanation:
Find the isotope nation and the decay particle
A property is an aspect of matter that can be observed or measured without changing its chemical composition. Examples of properties include molecular weight, and A property may only be observed by changing the chemical identity of a substance. In other words, the only way to observe a property is by performing a chemical reaction. This property measures the potential for undergoing a chemical change. Examples of chemical properties include and oxidation states
Answer:
A physical property is an aspect of matter that can be observed or measured without changing its chemical composition. Examples of physical properties include molecular weight.
A chemical property may only be observed by changing the chemical identity of a substance. In other words, the only way to observe a chemical property is by performing a chemical reaction
Explanation:
Properties of matter
The properties of matter are classified into; (I) Physical and, (ii) Chemical properties.
Physical properties: A physical property is an aspect of matter that can be observed or measured without changing its chemical composition. Examples of physical properties include molecular weight, density, color, melting and boiling point, etc.
Chemical properties: A chemical property may only be observed by changing the chemical identity of a substance. In other words, the only way to observe a chemical property is by performing a chemical reaction. This property measures the potential for undergoing a chemical change. Examples of chemical properties include and oxidation states, acidic or basic properties, flammability, heat of combustion, etc.
What are the characteristics of an experiment? What are key parts of an experiment?
Answer:
independent variable - the thing you change
dependent variable - the thing you measure
control variables - the things you keep the same
A student performs an experiment to study how sound waves are transmitted by placing a ringing buzzer inside a bell jar and sealing the jar. The student then connects the bell jar to a vacuum pump to remove the air from inside of the jar. The table shows the student’s observations before and after removing the air from the bell jar.
What can be concluded from the experiment?
A. Sound waves are transverse waves.
B. Sound waves do not transmit through material mediums.
C. Sound waves do not carry energy when they are transmitted.
D. Sound waves transfer energy through the vibration of particles in mediums.
Answer:
D. Sound waves transfer energy through the vibration of particles in mediums.
Explanation:
It can be concluded from the experiment that sound waves will only propagate through vibration of particles in mediums.
The particles of the medium is the air.
This type of wave is called a mechanical wave. A mechanical wave is one that requires material medium for their propagation.Option A ; Sound waves are transverse waves; while this might be true or not, we cannot ascertain that through this experiment described.
Option B: this negates the conclusion that should be drawn from the experiment.
Option C: we cannot draw this sort of conclusion from such an experiment as this.
Therefore, the right choice is that, sound waves transfer energy through the vibration of particles in mediums.
Write two uses of sublimation process?
Answer:
Explanation:
Practical Applications of Sublimation
Sublimation and erosion cause ablation, a process that wears down glaciers. Sublimation of iodine may be used to reveal latent fingerprints on paper. Sublimation is used to purify compounds. ... Because dry ice sublimates so readily, the compound is used to produce fog effects.
What is the last step in the scientific method?
A. Make an observation
B. Form a hypothesis
C. Test your hypothesis
D. Form a conclusion
Answer:
D
Explanation:
Because do all of that and then you do a conclusion
When elements form ionic bonds, each atom is left with a __________________ outer shell.
WILL MAKE BRAINLIEST !!! help plssss
Answer:
Each atom is left with a complete outer shell. An ionic bond forms between a metal ion with a positive charge and a nonmetal ion with a negative charge.
HOPE DAT HELPS BRO!
Im literally failing some classes can some one help me with them
Answer:in can
Explanation:
Answer:
What are your subjects you need help with?
please help me with this or I may get an F in chemistry :(
Answer:
Subconscious - psychic activity just below the level of awareness
Election - the act of electing someone
Explanation:
I hope this helped enough, good luck in chemistry!
How do physical changes and chemical changes differ and how are they alike please at least 5 provide examples each for a brainliest!
Answer:
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
How are physical and chemical changes similar and different? (compare and contrast) (Physical and chemical changes are similar because matter experiences a change in state, Physical changes are different because matter remains the same substance, just in a different state, whereas chemical changes change the matter
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input. The only way to reverse a chemical change is via another chemical changes.
Explanation:
Plumbers often use a "dielectric union" joint to join pipes of different types. For example, copper pipes in a house might need to be joined with lead pipes in the main water supply. The dielectric union is a plastic joint that will not conduct electricity. Propose an explanation for why a copper pipe can't simply be welded directly to a lead pipe.
Answer:
a copper pipe can't simply be welded directly to a lead pipe because lead has a far lower melting point than copper and thus the lead will melt before the copper can even be effected.
Explanation:
A lead pipe is a pipe that's made of lead and is usually used in distribution of potable water to connect a water main source to a user's preferred area.
Now, a copper pipe can't simply be welded directly to a lead pipe because lead has a far lower melting point than copper and thus the lead will melt before the copper can even be effected.
Lead has a melting point of 327.5° C while copper wire has a melting point of 1082.778 °C
Ammonium nitrate (NH4NO3) is a common component of fertilizer because it is a great source of two nitrogen-containing ions that easily dissolve into water. A large batch of this liquid fertilizer is made by adding 2.13 pounds of ammonium nitrate to 26.00 gallons of water. What is the molarity of this solution? (Hint: 1 lb. = 454 g and 1 gal. = 3.79 L.)
Answer:
0.123 M
Explanation:
Molarity, which is molar concentration can be calculated by using the formula;
Molarity = number of moles (n) / Volume (V)
Number of moles of NH4NO3 can be calculated by using;
Mole = mass (M) / Molar mass (MM)
Since atomic mass of N= 14, H=1, O=16
Molar mass of NH4NO3 = 14 + 1(4) + 14 + 16(3)
= 14 + 4 + 14 + 48
= 80g/mol
1 pounds = 454g
2.13 pounds= 2.13 × 454 g
= 967.02g
Hence; mole of NH4NO3 = 967.02/80
= 12.09moles
Molarity of NH4NO3 in water (solution) = number of moles of NH4NO3 ÷ volume of water
1 gallon = 3.79Litres
26gallons = 26 × 3.79 litres
= 98.54 Litres
Therefore, Molarity = 12.09/98.54
Molarity of NH4NO3 solution = 0.1226
= 0.123M or mol/L
If Isaiah boiled 10 liters of water at 100°C, at which temperature would he boil 20 liters of water?
Group of answer choices
200°C
10°C
20°C
100°C
SOMEONE ANSWER DA QUESTON
Which is a characteristic of colloids?
a. are homogenous mixtures
b. have large dispersed particles
c. will settle out over time
d. are made up of at least two substances
Answer:
D
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The definition of colloids is very disputed on whether or not it is homo/heterogenous. I wouldn't go with this answer, but its based on what you learned it was. At a microscopic level its hetero but at a macroscopic its homo.
They do have somewhat large dispersed particles but this better describes suspensions
They don't easily settle out.
And in order to be a mixture, they are made up of at least two substances
D is likely the best answer out of the bunch.
Colloids are made up of at least two substances. Therefore, option d is correct.
What are colloids?A colloid can be described as a mixture in which one substance consisting of dispersed insoluble particles is throughout another substance. The particles should be dispersed in a liquid. The term colloidal suspension can be referred to unambiguously as the overall mixture.
A colloid exhibits a dispersed phase and a continuous phase. The dispersed phase particles have a diameter of about 1 nm to 1 μm. Some colloids are translucent due to the Tyndall effect and other colloids can be opaque or have a slight color.
Hydrocolloids can be described as certain chemicals that are colloidally dispersible in water. Therefore becoming very "soluble" they can change the rheology by raising the viscosity.
A colloid possesses a dispersed phase and a continuous phase. A solute in a solution is individual molecules, whereas colloidal particles can be bigger.
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5. How can you use the periodic table to help predict the types of bonds elements will form?
What provides the energy that drive convection in the atmosphere and
oceans? A.reflected light from the moon.B. Direct rays of the sun.C. Heat from the earth core
Answer:
A
Explanation:
The moon is connected to the ocoen
Match the block to its correct density.
1 .
0.917 Kg/L
Block A
2 .
0.70 Kg/L
Block B
3 .
3.53 Kg/L
Block C
4 .
19.3 Kg/L
Block D
5 .
0.64 Kg/L
Block E
Answer:
Block A - 19.3
Block B - 0.64
Block C - 0.70
Block D - 0.917
Block E - 3.53
Hope this helps :)
Answer:
Block A - 19.3
Block B - 0.64
Block C - 0.70
Block D - 0.917
Block E - 3.53
Explanation: