Answer:
3.2 x 10²¹molecules
Explanation:
Given parameters:
Volume of nitrogen gas = 120cm³
Unknown:
Mass of nitrogen gas = ?
Number of molecules = ?
Solution:
To solve this problem, note that;
1 mole of gas occupies a volume of 22.4L at STP
Now;
convert 120cm³ to L ;
1000cm³ = 1L
120cm³ gives 0.12L
Since;
22.4L of gas has 1 mole at STP
0.12L of gas will have [tex]\frac{0.12}{22.4}[/tex] = 0.0054mole at STP
So;
Mass of N₂ = number of moles x molar mass
Molar mass of N₂ = 2(14) = 28g/mol
Mass of N₂ = 0.0054 x 28 = 0.15g
Now;
1 mole of a gas will have 6.02 x 10²³ molecules
0.0054 mole of N₂ will contain 0.0054 x 6.02 x 10²³ =
3.2 x 10²¹molecules
Which of the following about sodium atoms
(Na) is NOT correct?
1. All neutral sodium atoms have 11 protons
and 11 electrons.
2. All sodium atoms have the atomic number
11.
3. All sodium atoms have the same number
of protons.
4. All sodium atoms have 11 neutrons.
5. All atoms with atomic number 11 are
sodium atoms.
Answer:
1 is not correct ......
All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct. Therefore, option 1 is correct.
Which are neutral atoms?When an atom has the same number of electrons and protons, it has the same number of negative (electrons) and positive (protons) electric charges (the protons).
As a result, the total electric charge of the atom is zero, and it is said to be neutral. As a result, all elements in the periodic table have neutral atoms.
The sodium atom contains 11 electrons. As sodium atom loses one electron to form sodium ion, sodium ion has ten electrons. Only sodium atoms have a strong reaction with water, whereas sodium ions do not.
Thus, All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct, option 1 is correct.
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Position always is relative to another object or location
options: True False
Answer:
True
Explanation:because of the motion
Remember to balance the equations first
1. Calculate the number of moles for each product produced (carbon dioxide, nitrogen,
oxygen and water) from the detonation of 3.2 mol of nitroglycerin by the reaction.
C,H,O,N, → CO, + N2 + O2 + H2O
mol CO₂ = 9.6
mol N₂ = 4.8
mol O₂ = 0.8
mol H₂O = 8
Further explanationReaction
4C₃H₅O₉N₃ → 12CO₂ + 6N₂ + O₂ + 10H₂O
mol CO₂
[tex]\tt \dfrac{12}{4}\times 3.2=9.6[/tex]
mol N₂
[tex]\tt \dfrac{6}{4}\times 3.2=4.8[/tex]
mol O₂
[tex]\tt \dfrac{1}{4}\times 3.2=0.8[/tex]
mol H₂O
[tex]\tt \dfrac{10}{4}\times 3.2=8[/tex]
Which of the following quantum numbers describes a d-orbital in the fourth energy level?
a. n = 4, l = 0, m = 0
b. n = 3, l = 1, m = 0
c. n = 3, l = -1, m = 0
d. n = 4, l = 2, m = 0
Answer:
d. n = 4, l = 2, m = 0
Explanation:
A d-orbital in the fourth energy level can only be represented by n = 4, l = 2, m = 0.
n is the principal quantum number(n) which signifies the energy level, here it is 4;
l is the azimuthal quantum number or l which signifies the shape of the subshell, it takes a value of n - 1, 0,1,2 or 3
m is the magnetic quantum number(m) which can be -2, -1, 0, 1 , 2
So, the right and fitting solution is n = 4, l = 2, m = 0
Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a relationship. A particular species of lizards is introduced into the marshy land. These lizards also start feeding on these insects. The introduction of lizards may lead to .
Answer:
The indroduction of lizards in this marshy habitat may lead to severe alterations of its own ecosystem. Since the lizards and frogs are both species who feed on small insects, the insect population might begin to decrease around the area. Furthermore, if insects have lessened in the marsh, that means food for the lizard as well as for the frog. In an extreme scenario, unless the two species adapt to these new conditions, their population may rapidly decrease.
Answer:
Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a commensal-host relationship. A particular species of lizards is introduced into the marshy land. These lizards also start feeding on these insects. The introduction of lizards may lead to competition between lizards and frogs for food .
Throughout the reflection, make sure you have a copy of the Student Guide and your data table. Choose the terms that complete the statements.
In this lab, you determined the combination of humidity, air temperature, and air pressure that create weather patterns.
is the amount of water vapor in the air compared to the amount of water vapor the air can actually hold.
is a measure of how hot or cold the air is, and
is the force exerted per unit area by the particles in the air. These
conditions influence weather patterns.
Answer:
A. relative humidity B. air temperature C. air pressure D. atmospheric
Explanation:
The sentences can be completed as follows; Humidity is the amount of water vapor in the air compared to the amount of water vapor the air can actually hold. Air temperature is a measure of how hot or cold the air is, Air pressure is the force exerted per unit area by the particles in the air. These conditions influence weather patterns.
What is humidity ?Humidity refers to the amount of water vapor or moisture present in the air. Specifically, it is the measure of the amount of water vapor present in the air compared to the amount of water vapor the air can actually hold at a particular temperature and pressure.
It is often expressed as a percentage, known as relative humidity, which describes the amount of moisture in the air relative to the maximum amount it can hold at a given temperature.
The given sentences can be completed as :
Humidity is the amount of water vapor in the air compared to the amount of water vapor the air can actually hold. Air temperature is a measure of how hot or cold the air is, Air pressure is the force exerted per unit area by the particles in the air. These conditions influence weather patterns.
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HELP PLEASE!!!
HCl is _____.
a base
a neutral
an acid
Answer:
an acid
Explanation:
Hydrochloric acid or muriatic acid is a colorless inorganic chemical system with the formula HCl. Hydrochloric acid has a distinctive pungent smell. It is classified as strongly acidic and can attack the skin over a wide composition range, since the hydrogen chloride completely dissociates in an aqueous solution. Wikipedia
a simple definition of cells
Answer:
Cells are the basic structural and functional unit of life.
What is the shortest bond type?
Who and when found Neutron?
Can someone explain how my teacher got that result in acceleration
Where are the different
particles in an atom located and what are their charges?
Explanation:
The different subatomic particles in an atom are the:
Protons which are the positively charged particles. Electrons which are the negatively charged particles. Neutrons which do not carry any charges.Protons and neutrons are located in the nucleus of an atom which is the tiny center of the atom.
Electrons orbits around the nucleus and fill the rest of the volume of atom.
The table lists properties of some elements. Which element would you
expect to be in group 18 of the periodic table?*
2 points
Element
Electrons in a
Neutral Atom
Electrons in
Outer Energy Level
4
Carbon
6
8
6
Oxygen
Neon
10
8
Sodium
11
1
Chlorine
17
7
carbon
neon
chlorine
O sodium
Answer:
the 18 columns are labeled “Group” Figure 2. Elements in the periodic table are ... differ dramatically in their chemical and physical properties, but some elements are ... The groups can also be referred to by the first element of the group.
Explanation:
Select the correct answer
Because of its size, adult blue whale has few natural predators. It’s diet consists exclusively of tiny creatures called krill. These whales can dive to great depths but must come to the surface regularly for air. From this information, what is one limiting factor for population of blue whales?
A. Availability of krill
B. Available sunlight for photosynthesis
C. Oxygen in water
D. Salinity of water
E. Visibility in water
Answer:
A
Explanation:
The correct answer would be the availability of krill.
A limiting factor is a substance or condition whose presence/absence can prevent a population from reaching its potential. Limiting factors can be biotic (living) or abiotic (non-living). Biotic factor includes the presence of competitive organisms in a population while abiotic factor includes food.
In the case of the blue whale, its diet is krill. Hence, its survival is largely dependent on the availability of krill. Otherwise, the blue whale might starve. Therefore, the availability of krill is a limiting factor for the population of whales.
The correct option is A.
Which choice describes the forms that energy takes when it starts in the Sun and ends in the sugars of plants? A. chemical potential energy light energy nuclear energy B. nuclear energy light energy chemical potential energy C. nuclear energy chemical potential energy light energy D. light energy nuclear energy chemical potential energy
Answer:
D. light energy nuclear energy chemical potential energy
Explanation:
Energy transformation that takes place in plants when they change sun solar energy into plant glucose, is :
Light energy (by sunlight) to nuclear energy , chemical potential energy (glucon energy in plant cell - used by plants to make food).
The gradual temperature change from one season to the next is due to what? view attachment
Answer:
The greenhouse effect
Explanation:
The greenhouse effect is a straightforward method that heats the Earth's exterior. When the Sun's rays touch the Earth's environment, some of it is bounced back to space and the rest is grasped and re-heated by greenhouse gases. The consumed energy heats the environment and the exterior of the Earth.
What is the specific heat of a metal if the temperature of a 12.5 g sample increases
from 19.5C to 33.6C when it absorbs 37.7J of heat?
Answer:0.213 J/g°C
Explanation:
To calculate specific heat of the metal, the formula is used:
Q = m × c × ∆T
Where Q = amount of heat
m = mass
c = specific heat
∆T = change in temperature
Explanation:
When you look at the absorption spectra of cranberry juice and apple juice, what colors/parts of the visible spectrum are absorbed?
Discuss how the colors/parts that are not absorbed contribute to the colors of cranberry juice and apple juice.
Looking at the absorption Spectra of cranberry juice and apple juice the color and part of the visible spectrum that are absorbed as well as how the colors that are not absorbed contributed to the the colors of the cranberry juice and apple juice are;
When the light actually hits on a surface,it is only a part of it that is reflected to the eyes whereas the rest of the spectrum is then absorbed by the object.
However,if the red wavelength is reflected,you will see the red color,but if all the spectrums are absorbed,you will see the black color,if then all the spectrums is reflected,you will see the white color.
When the light hits the surface, just a part will be reflected in the eyes of the person.
From the complete information, when an individual looks at the absorption spectra of cranberry juice and apple juice, just a part will be seen.
When the light hits the surface, there'll be a reflection in the eyes of the person as just a part will be reflected. The rest of the spectrum will be absorbed by the object.
Also, if the red wavelength is reflected, then one will see the red color. When all the spectrum is absorbed, one will see the black color. Lastly, when all the spectrum is reflected, one will see the white color.
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what organisms do pteropods eat
nutrient enriched plankton i believe! :)
A liquid is cooled during an investigation causing it to solidify. Which of the following most likely occurred?
Answer:
This question lacks options, the options are;
A. Absorption of heat
B. A chemical change
C. A physical change
D. Formation of a new compound
The answer is C. A physical change
Explanation:
A physical change is a type of change that does not involve the chemical composition of the substance(s) involved. Physical changes affect the form but not the chemical content of a substance. Examples of physical changes are freezing, change of state, boiling etc.
In this question, a liquid is cooled during an investigation causing it to solidify. The cooling of this liquid represents a PHYSICAL CHANGE because the liquid state of the substance is only changed to a solid state but does not involve changing the chemical composition of the substance.
A liquid is cooled during an investigation physical change causing it to solidify.
What is physical change?Physical change occurs whenever there is difference in the appearance of any object observed.
In the question it is given that during an investigation a liquid is cooled down which results in the solidification of that liquid. During that change state of material changes from liquid state to the solid state, which is an example of a physical change.
Hence, in the question physical change occurs.
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Which of these statement describe a chemical property
How are atoms combined in a mixture?
Answer:
Chemically combined and cannot be separated
Explanation:
1)A minimum of two atoms combine to form a molecule.
2)Atoms are combined via chemical reactions thus chemically combined. Sodium+Chlorine
e.g Na+Cl—>NaCl²
How can you tell which elements form chemical bonds?
Answer: The number of bonds that an element can form is determined by the number of electrons in its valence shell. Similarly, the number of electrons in the valence shell also determines ion formation.
Explanation:
Calculate the number of sulfate ions in 41.65 g of aluminum sulfate.
The number of sulfate ions : 2.2 x 10²³
Further explanationReaction
Al₂(SO₄)₃⇒2Al³⁺+3SO₄²⁻
mol Al₂(SO₄)₃(MW=342,15 g/mol) :
[tex]\tt \dfrac{41.65}{342.15}=0.122[/tex]
mol of sulfate ions (SO₄²⁻)
[tex]\tt 3\times 0.122=0.366[/tex]
1 mol = 6.02 x 10²³ particles (ions, molecules, atoms), so for 0.366 mol :
[tex]\tt 0.366\times 6.02\times 10^{23}=2.20\times 10^{23}[/tex]
What is the volume of 902.0 g of C₂H₄ gas at STP
Answer:
Volume = 722.1 L
Explanation:
Given data:
Mass of gas = 902.0 g
Temperature = standard = 273.15 K
Pressure = standard = 1 atm
Volume of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will calculate the number of moles of C₂H₄.
Number of moles = mass/molar mass
Number of moles = 902.0 g/ 28.05 g/mol
Number of moles = 32.2 mol
Volume of gas:
PV = nRT
1 atm ×V = 32.2 mol × 0.0821 atm.L/ mol.K × 273.15 K
V = 722.1 atm.L/1 atm
V = 722.1 L
Pls help I’m stuck on this part
Answer:
As you begin your trip down the hill you increase your speed resulting in a transformation from potential energy to kinetic energy.
Explanation:
At the top of the mountain, you have potential energy. But as you start moving down the mountain, your speed increases and have a lot of kinetic energy.
13. Which are the simplest pure substances that cannot be broken down into any other substances?
Answer:
Elements
Explanation:
Each kind of atom is an element. Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.
Answer:
Elements
Explanation:
Elements such as those on the periodic table are unable to be broken down into simpler forms.
Mixtures (both homogenous and heterogenous) are made of multiple elements making it able to be physically broken down back to its original elements.
Compounds are also made up of multiple elements, however it must go through a chemical separation process in order for it to be broken down into its original elements.
Matter is a broad term of any substance. So it could both be a combination or a single element making it incorrect for this question.
The change of state from a gas to a liquid. *
O evaporation
O condensation
O sublimation
O deposition
Answer:
A, Condensation
Explanation:
I got it correct :)
proper regulation of the cell cycle provides which of the following benefits to multicellular organisms. select all of the correct answers.
~repair and renew wounds effectively
~replacing lost cells,such as a shed skin cell
~allows for growth
~allows for reproduction
Answer: repair and renew wounds effectively
~replacing lost cells, such as a shed skin cell
~allows for growth
~allows for reproduction
Explanation:
The cell cycle includes the various events in which a cell matures by increasing length and shape, cell replicates its genome and prepare itself for cell division.
The cells divide and replace the old and damaged cells in the multicellular organisms. Multicellular organisms are those organisms which have more than one cell.
This also helps in replacing the lost cells and helps in removing the shedding the skin cell.
This process is also useful for cellular growth and reproduction.
given the following balanced chemical equation:
2KHCO3→K2CO3+ CO2+ H2OA.
What are the conversion factors between moles of KHCO3and moles of K2CO3?
Answer:
2 to 1
Explanation:
The reaction equation is given as:
2KHCO₃ → K₂CO₃ + CO₂ + H₂O
The conversion factor between the moles of KHCO₃ and K₂CO₃ is 2 to 1.
From the balanced chemical equation, we find out that;
2 moles of 2KHCO₃ will produce 1 mole of K₂CO₃.
So given any mole of either of the reactant or product, we can find the unknown.