Answer:
The particle model does not take into account: the size and shape of particles. the space between particles.
The weakness of particle theory are:
matter is very small in size which are continuously moving. most of the particle are not spherical.particles are not solid because atoms are having empty space.What is particle theory?it is a part of kinetic theory which states that all matter consists of very small particles which are constantly moving or in a continual state of motion.
Therefore, lack of space between particles and size of particles are the limitations of particle theory.
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SECTIONA ANSWERALL QUESTIONS (5 MARKS PER QUESTION) 1:03 mixing a solution of silver nitrate and dilute hydrochloric acid a white precipitate is :o:med inrmediately. 1) Write an equation for the reaction (ii) The precipitate darkens rapidly upon standing. Why? :12 Explain why conductivity measurements of M* in aqueous solutions is in the order: Cs' > Rb'>K" > Na* > Li' A3 Why is it that lithium salts are often hydrated whereas those of the other alkali metals are ofien anhydrous? 44 Explain with the help of chemical equations why BeCl2 is acidic .45(a) State the main types of bonds formed by hydrogen Star lo list three ways of preparing hydrogen 16 Write an equation and identify the element formed when: (a) Polonium 210 undergoes a- decay (b) Actrium 277 undergoes ß- decay (0) Iridium 186 undergoes electron capture d) Bismuth 192 undergoes positron emission (C) Iodine 133 undergoes B- emission 47 The Uranium decay series starts with 238,2Uand ends with 206,2Pb. Each step involves the Luistentie
Answer:..,.,
Explanation:88.,,'
Which of the following sets of quantum numbers is not allowed?
A.) n=3, l=2, ml=-2
B.) n=4, l=3, ml=-3
C.) n=2, l=1, ml=-1
D.) n=2.5, l=0, ml=0
E.) n=3, l=2, ml=-1
Answer:
D) n = 2.5, ℓ = 0, mℓ = 0
Explanation:
According to the rules governing acceptable quantum numbers, the value for n must be an integer. Therefore, the set {n = 2.5, ℓ = 0, mℓ = 0} is not allowed.
The diameter of Mercury is 4,878,000 meters.
Type your answer..
Answer:
The diameter of a mercury atom is 151 pm and the diameter of the planet Mercury is 4,879.4 km.
Convection currents in the atmosphere influence many weather patterns. What property of the air has the most influence on convection currents?
1. The direction of the wind
2. The velocity of the wind
3. The temperature of the air
4. The mass of the air
Convection currents are largely influenced by air temperature. A low-pressure area is produced when air is heated because it becomes less dense and rises.
What effect on the climate does convection have?For instance, the air above the Earth heats and rises as its surface warms from the sun. This air may continue to rise while cooling and producing cumulus clouds if the conditions allow.
How do air masses respond to convection currents?Climate-affecting wind patterns are driven by convection currents. Convection currents are used to shift air masses. There are two different kinds of air masses: warm and cold. From higher latitudes to lower latitudes, cold air masses travel.
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At this location, it is winter because the North Pole is tilted
Towards the sun
Away from the sun
Answer:
Away from the sun
Explanation:
winter
In the Northern Hemisphere, winter generally begins on December 21 or 22. This is the winter solstice, the day of the year with the shortest period of daylight. Summer begins on June 20 or 21, the summer solstice, which has the most daylight of any day in the year.
A basketball weighing 0.5 kg is flying through the air at 10
m/s. What is its kinetic energy?
Enter the answer
Check it
Improve this questio
Answer:
25J
Explanation:
Kinetic energy = (mv^2)/2. So (.5)(10^2)/2 = 25 J
The relationships among which variable quantities are expressed by the ideal gas law equation?
A. pressure, volume, temperature, number of moles
B. volume, temperature, number of moles, gas constant
C. pressure, volume, number of moles, mass
D. pressure, volume, temperature, molar mass
Answer:
A. Pressure, volume, temperature, number of moles
The relationships among pressure, volume, temperature, and the number of moles are expressed by the ideal gas law equation. Therefore, option A is the correct answer.
The ideal gas law equation is PV = nRT, where P represents the pressure of the gas, V represents its volume, n represents the number of moles of gas present, T represents its temperature, and R is the ideal gas constant. This equation describes the behavior of an ideal gas at standard temperature and pressure (STP).
By manipulating the ideal gas law equation, we can calculate various properties of gases, including their density, molar mass, and molecular weight. This equation is widely used in chemical engineering, thermodynamics, and other fields that deal with gases.
Thus, option A is correct.
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Combustion of 28.0 g of gasoline releases 322 kcal of thermal energy. How many kilojoules of energy are released?
In the combustion of 28.0 g of gasoline, 1348.1 kilojoules of energy are released.
To find the energy released, we need to convert the energy in kilocalories to kilojoules.
We need to remember that:
1 cal = 4.1868 J (joules)1 kcal = 1000 cal1 kJ = 1000 JHence, the energy in kJ is:
[tex] E = 322 \:kcal*\frac{4.1868 \:J}{1 \:cal}*\frac{1000 \:cal}{1 \:kcal}*\frac{1 \:kJ}{1000 \:J} = 1348.1 \:kJ [/tex]
Therefore, 1348.1 kilojoules of energy are released.
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Which of these is a function of all cells ?
A. To produce oxygen through photosynthesis
B. To combine with other cells to form tissues
C. To subdivide to form cells for sexual reproduction
D. To transfer genetic information from one generation to the next
Answer:
a because it help in protecting disease
What is the difference between a theory and a scientific law?
Think of it like theory and physics.
A theory is an idea that needs to be tested.
Scientific law is something that cant be proven wrong.
How would a descriptive model of Earth's layers be categorized?
a. abstract model
b. prototype model
c. concrete model
d. conceptual model
The Earth can be divided into one of two ways – mechanically or chemically. Mechanically – or rheological, meaning the study of liquid states – it can be divided into the lithosphere, asthenosphere, mesospheric mantle, outer core, and the inner core.
Explanation:
Which of the following steps is important to critical thinking?
implementing solutions
b utilizing facts
c. holding firm to conclusions
d answering questions
Please select the best answer from the choices provided
Answer:
b
Explanation:
edge 2022
6Na(s) + N2(g) --> 2Na3N(s)
Answer:
80.0 g Na and 20.0 g N2.
Explanation:
This means the limiting reactant determines the maximum mass of the product formed.
Calculate the heat produced by hydrolysis of 65 kg of ATP (the molecular weight of ATP is 507.18 g/mol).
The heat produced by hydrolysis of 65 kg of ATP is -6.8 kJ.
Let's consider the thermochemical equation for the hydrolysis of ATP.
ATP + H₂O ⇒ ADP + Pi ΔG = -57 kJ/mol
We will convert 65 kg of ATP to moles using its molecular weight (507.18 g/mol).
[tex]65 \times 10^{3} g \times \frac{1mol}{507.18g} = 1.2 \times 10^{2} mol[/tex]
57 kJ of heat are released by the hydrolysis of 1 mole of ATP. The heat released by the hydrolysis of 1.2 × 10² moles of ATP is:
[tex]1.2 \times 10^{2} mol \times \frac{(-57kJ)}{1mol} = -6.8 \times 10^{3} J = -6.8 kJ[/tex]
-6.8 kJ is the heat produced by hydrolysis of 65 kg of ATP.
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please answer this correctly
Answer:
B. basic
Explanation:
Because acidic is sour in test, salt is tasty in taste, and neutral neither bitter, tasty and nor sour
Polymers are large organic molecules that are made of
a.
cations.
c.
carbon and oxygen only.
b.
anions.
d.
repeating units.
Answer:
D) Repeating units.
Explanation:
Polymers are large macromolecules which are made up of many repeating structural units called monomers :)
please help me solve this
Answer:
dude your handwriting!!!
Aluminum reacts with chlorine gas according to the following equation shown below. How many
moles of Cl2 are required to react with 0.062 mol of Al?
2 Al(s) + 3 Cl2(g) → 2 AIC13()
_mol
Answer:
nCl= 0,062x3/2=0,093(mol)
Explanation:
when an ion has a positive charged what has the highest value of this ion ?
is it
proton
neutron
electron
nucleon
and why did you choose tte answer ?
Answer:
Highest charge +4ProtonExplanation:
Why +4?
Elements have valency starting from -4 to +4Point to be noted that only Carbon family elements can show +4 or -4 valencyplease help with this!
Answer:
d) The object falls towards the ground
Explanation:
Nitroglycerine, used to treat patients with angina, is prescribed for a patient by IV at a rate of 2.10 x 102 ug/min. The IV bag
contains 50. mg nitroglycerine/250 mL D5W. How many milliliters per hour should the patient receive?
Given the flow rate and the amount of nitroglycerine contained in the IV bag, the patient should receive 63 milliliters per hours.
Rate of prescribed dose by IV: [tex]2.10*10^2 ug/min = 210ug/min[/tex]
Available: [tex]50mg nitroglycerine = 50000ug[/tex]
Available Volume: [tex]150mL[/tex]
Hence, [tex]50000ug = 250ml[/tex]
and volume for [tex]210ug = x[/tex]
We cross multiply to find x
[tex]x = \frac{210ug * 250mL}{50000ug} \\\\x = 1.05mL[/tex]
Meaning that in a single minute, 1.05mL is been infused into the patient
Now, for an hour, ( 60 minutes ) the volume infused will be;
[tex]1min = 1.05mL[/tex]
[tex]60min = x[/tex]
We cross multiply to find x
[tex]x = \frac{1.05mL*60min}{1min}\\\\x = 63mL[/tex]
Therefore, given the flow rate and the amount of nitroglycerine contained in the IV bag, the patient should receive 63 milliliters per hours.
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L 2.5.2 Test (CST): Computer-Scored Unit Test
Question 5 of 25
How does increasing the temperature affect a reaction?
A. An increase in temperature slows down the reaction.
B. An increase in temperature increases the reaction rate.
C. An increase in temperature lowers the reaction's activation energy.
D. An increase in temperature changes equilibrium concentrations.
SUBMIT
Answer:
b
Explanation:
The concept Arrhenius equation is used here to determine the temperature dependence of the rate of a reaction. An increase in temperature increases the rate of a reaction. The correct option is B.
What is Arrhenius equation?The rate of a chemical reaction is affected by the factors like temperature and activation energy. The influence of these factors on the rate of the reaction is explained by the Arrhenius equation.
The equation is given as:
[tex]k = A. e^{-} ^{E_{a} } /RT[/tex]
k - Rate constant
A - Frequency factor
Eₐ - Activation energy
R - Gas constant
T - Temperature
Since 'Temperature' appears in the denominator of the negative power of the exponential factor of the equation, it is evident that an increase in temperature increases the value of rate constant and thereby increases the rate of the reaction.
Thus the correct option is B.
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5. Neon has two major isotopes. Neon-20 and Neon-22. Out of every 250 neon atoms, 225 will be Neon-20
(19.992 g/mol), and 25 will be Neon-22 (21.991 g/mol). What is the average atomic mass of Neon?
Answer:
20.1974
Explanation:
The Atomic mass will be the same for every isotope as the number of Neutrons changes, not the number of protons.
Neon has two major isotopes. Neon-20 and Neon-22. Out of every 250 neon atoms, 225 will be Neon-2(19.992 g/mol), and 25 will be Neon-22 (21.991 g/mol), then the average atomic mass of Neon20.1974
What are the difference between atomic number and atomic mass ?Atomic mass of an element can be defined as the total number of neutrons and protons present in the nucleus of an atom and the atomic number is the number of protons present in nucleus.
the average weight of an element is called as atomic mass while atomic number is total number of protons present in the central nucleus of the atom. Atomic mass is presented a symbolic representation of A where as atomic number is represented by the letter Z.
Atomic mass can not classified which type of element where as Atomic number classify and identify the type of element, there are different types of isotopes of an element observed on the basis of their atomic mass where as isotopes only share the same atomic number.
Neon has two isotopes such as , N e 20, N e 21 and N e 22.The average atomic mass can be calculated as:
N e Average atomic mass = [ 19.9924 (90.92 %)] + [ 20.9940 (0.257 %)] + [ 21.9914 (8.82 %)] a m u
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Noble gas:
Oxygen
Chlorine
Or Krypton
Answer:
Krypton
Explanation:
Answer:
C
Explanation:
trust me :)
Write a balanced chemical equation for the standard formation reaction of gaseous nitrogen monoxide (NO). Please help me
Answer:
N2 + O2 ------------->2NO(Balanced Reaction)
A balanced chemical equation for the standard formation reaction of gaseous nitrogen monoxide (NO) -
1/2 [tex]N_{2}[/tex] (g) + 1/2 [tex]O_2[/tex] (g) -----------------> NO (g)
Synthesis or formation reactions involve the combination of two or more substances that will react. There is only one product of a synthesis reaction.
Chemical reactions involve the rearrangement of electrons between elements resulting in the formation of a new substance.in a standard formation reaction, one mole of a substance is produced from its elements in their standard states.Standard formation reaction at 25 degrees C and 1 atm pressure.1/2 [tex]N_{2}[/tex] (g) + 1/2 [tex]O_2[/tex] (g) -----------------> NO (g)
Thus, A balanced chemical equation for the standard formation reaction of gaseous nitrogen monoxide (NO) -
1/2 [tex]N_{2}[/tex] (g) + 1/2 [tex]O_2[/tex] (g) -----------------> NO (g)
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MARKING BRAINLIEST!
Meg ran 100 meters in 7.8 seconds. Linda ran 100 meters in 14.5 seconds. Which statement is correct?
Linda's speed was faster than Meg's speed.
Linda's speed was slower than Meg's speed.
Linda and Meg traveled the same distance at the same rate.
Linda and Meg traveled the same distance over a certain time.
✞how are snythetic detergents better than soap??⭐⭐㋛
Answer:
Advantages of synthetic detergents over soaps: Detergents can work with hard water too while soaps cannot. Synthetic detergents are stronger cleansing agents than soaps.
Explanation:
sorry if I'm wrong
which phrase is the best description of osmosis
movement of water from high potential to low potential
Select the statements that correctly describe an meteoroid. Check all that apply
largest of the space rocks.
smallest of the space rocks
when in the atmosphere, they are called a meteor
they never come near Earth
Answer:
they are the smallest of space rocks, when in the atmosphere they are called meteors.
Explanation:
i think this is right.
What type of policy does the Federal Reserve use to boast a slow growing economy?
Answer:
Tight monetary policy is an action undertaken by a central bank such as the Federal Reserve to slow down overheated economic growth. Central banks engage in tight monetary policy when an economy is accelerating too quickly or inflation—overall prices—is rising too fast.