Answer:
sound waves, light waves, radio waves, microwaves and others
Explanation:
these waves have the same fundamental properties of reflection ,refraction, diffraction and interference, and all waves have a wavelength, frequency, speed and amplitude
Plz help!
What is 1 item that is an element?
Give an example of how the 1 item is an element
Oxygen
Oxygen is considered an element because it cannot be broken down any farther.
what skill is a scientist using when she listens to the sound that whales make
Answer:
Making observations
Explanation:
The energy required to remove an electron from the outermost shell is called
Answer:
Ionization energy
Explanation:
Ionization energy can be defined as the energy needed to remove an electron from the outermost she'll.
Who wrote the first modern chemical textbook?
Antoine Lavoisier
Dmitri Mendeleev
Henry Moseley
Johann Dobereiner
Answer:
A. Antoine Lavoisier
Explanation:
He is know for creating the first chemical textbook. This textbook included rules for naming different chemical compounds, which is the still the same method we use to this day.
Hoped this can help! :D
Answer:
a
Explanation:
How many moles are in 25.3 g of a sample of potassium nitrate (KNO3)?
Answer:
25.3 g of KNO₃ contain 0.25 moles.
Explanation:
Given data:
Number of moles of KNO₃ = ?
Mass of KNO₃ = 25.3 g
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of KNO₃:
KNO₃ = 39 + 14+ 16×3
KNO₃ = 101 g/mol
Now we will put the values in formula.
Number of moles = 25.3 g/ 101 g/mol
Number of moles = 0.25 mol
Thus, 25.3 g of KNO₃ contain 0.25 moles.
I really l need help with this question
Answer:
A
Explanation:
The skin, mucous membranes, and endothelia throughout the body serve as physical barriers that prevent microbes from reaching potential sites of infection. Tight cell junctions in these tissues prevent microbes from passing through.
Hope this helps:)
which best describes matter?
Answer:
matter is anything that has mass and takes up space
Explanation:
Plz help!
How is oxygen an element? Explain.
If the volume of oxygen gas is 259 cm3 at 112 kPa, what would the volume be at 101.3 kPa?
Answer:
The answer is 286.36 cm³Explanation:
In order to find the volume be at 101.3 kPa we use Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the final volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\ [/tex]
From the question
P1 = 112 kPa = 112000 Pa
V1 = 259 cm³
P2 = 101.3 kPa = 101300 Pa
We have
[tex]V_2 = \frac{112000 \times 259}{101300} = \frac{29008000}{101300} \\ = 286.3573543...[/tex]
We have the final answer as
286.36 cm³Hope this helps you
What is the mass of 1.25 x 10^24 Oxygen atoms? *
1.)32.0 g
2.)1.6 x 10^23 g
3.)O 16.0g
4.)33.2 g
Answer:
4.)33.2 g
Explanation:
(1.25E24/6.022E23)×15.99
The number of valence electrons in an element affects the reactivity
of that element. Which element listed has the fewest valence
electrons?
Select one:
neon (Ne)
sodium (Na)
beryllium (Be)
oxygen (0)
Answer:sodium
Explanation:
Sodium is the element that has the fewest valence electrons. The correct option is B.
What is valance electron?A valence electron is an electron associated with an atom in the outer shell that can take part in the formation of a chemical bond if the surface layer is not closed.
Both atoms in a single covalent bond contribute one valence electron to form a shared pair.
Valence electrons are electrons in an atom's outermost shell, or energy level. For example, oxygen has six electron, two of which are in the 2s subshell and four of which are in the 2p subshell.
Because the highest energy 3s orbital has one electron, neutral sodium atoms have one valence electron.
Thus, the correct option is B.
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A 25.3-8 sample of an unknown compound contains
0.8 g of oxygen. What is the percent by mass of
oxygen in the compound?
The percentage by mass of oxygen in the 25.3 g sample of the unknown compound is 3.16%
From the question given above, the following data were obtained:
Mass of compound = 25.3 g
Mass of oxygen = 0.8 g
Percentage of oxygen =?The percentage of oxygen in the compound can be obtained as follow:
[tex]Percentage = \frac{mass of element}{mass of compound } *100[/tex]
Percentage of oxygen = [tex]\frac{0.8}{25.3} * 100[/tex]
Percentage of oxygen = 3.16%Thus, the percentage of oxygen in the compound is 3.16%
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explain how carbon and oxygen form carbon dioxide
Answer:
Carbon dioxide, or CO2, is a naturally occurring linear compound composed of two oxygen atoms covalently bonded to a carbon atom. The two C=O. Carbon DioxideA central carbon atom is connected to two oxygen atoms via double bonds in a linear structure.
Explanation:
is a nuclear reactor an example of fusion or fission?
Answer:
fission
Explanation:
What does the law of the kinetic theory state?
what is the amount of electrical energy utilized in moving the electrons from one terminal point in a battery called
Answer:
Explanation:
In a similar way charged particles such as electrons need to have work done to move them from one point to another. The amount of work per unit of charge is called is called the electric potential difference between the two points. The unit of potential difference is called the volt.
Given the mass number and atomic number, how do you determine the number of neutrons?
Answer:
You subtract the given atomic mass by the atomic number
Explanation:
The answer is the explanation
Which of the following is the name given to protons electrons and neutrons?
What happens in a chemical change that does not occur in a physical change?
Answer:
In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring.
Calculate the mass in grams of 8.24 x 1024 molecules of CO2
Answer:
Explanation:
1 mole of any gas contains 6.02 x 10²³ molecules of gas
6.02 x 10²³ molecules of CO₂ contains 1 mole of CO₂
8.24 x 10²⁴ molecules of CO₂ will contain 8.24 x 10²⁴/ 6.02 x 10²³ moles at STP
13.6877 moles
mol weight of CO₂ = 44 g
13.6877 moles of CO₂ = 44 g x 13.6877 g = 602.25 gm.
Which of the following is the ground state electron configuration of Ni?
Answer:
Nickel atoms have 28 electrons and the shell structure is 2.8. 16.2. The ground state electron configuration of ground state gaseous neutral nickel is [Ar]. 3d8.
Explanation:
What is true about the energy differences between electron orbitals in particular atoms?
Answer: When in a magnetic field, the two electrons in a particular orbital differ very slightly in energy because of a property called electron spin. The theory of electron spin states that the two electrons in a single orbital spin in opposite directions on their axes, causing an energy difference between them
Explanation: I hope this helps!
Parts working together for one purpose
Answer:
A system is a collection of parts that interact together for a common purpose. But a system is not just any old collection of parts. No single part can do the job alone, and any malfunction or delay is likely to affect the whole system. A body system is a set of body parts that do a particular task.
Explanation:
What is the volume in mL of .00024 moles of mercury? The density of mercury is 13.6 g/mL.
Answer : 3.53x10⁻³ ml
Further explanationDensity : the ratio between mass and volume
Can be formulated :
[tex]\tt \boxed{\bold{\rho=\dfrac{m}{V}}}[/tex]
ρ = density, kg/m³ or g/ml
m = mass, kg or g
V = volume = m³ or ml
While mol : dividing mass with molar mass(MW=molecular weight)
[tex]\tt n=\dfrac{mass}{MW}[/tex]
n= mol
mass = grams
MW = molecular weight ,g/mol
Knownmoles : 0.00024 moles of Mercury(Hg)
MW of Hg = 200,59 g/mol
so the mass of Mercury :
[tex]\tt mass=moles\times MW\\\\mass=0.00024\times 200,59\\\\mass=0.048~g[/tex]
Because the density of Mercury is 13.6 g/mL, then the volume :
[tex]\tt V=\dfrac{mass}{density}\\\\V=\dfrac{0.048~g}{13.6~g/ml}\\\\V=\boxed{\bold{3.53\times 10^{-3}ml}}[/tex]
is CaCl2 lonic or
Covalent
Answer:
Ionic
Explanation:
Ionic compounds generally form between elements that are metals and elements that are nonmetals. For example, the metal calcium (Ca) and the nonmetal chlorine (Cl) form the ionic compound calcium chloride (CaCl2).
what is the lewis structure for RnF2
Answer:
E3 ubiquitin-protein ligase RING2 is an enzyme that in humans is encoded by the RNF2 gene.
Explanation:
Lewis structure of Radon difluoride has three lone pairs and two bonding pairs.
What is Lewis structure?Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that depict the bonding between atoms in a molecule, as well as any lone pairs of electrons that may be present. It's used to depict how electrons in a molecule are distributed around specific atoms. Electrons are shown as "dots" or as a line between two atoms when they are bonded.
Hence, Lewis structure of Radon difluoride is
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If an element has an atomic number of 8 and an atomic mass number of 18, would it be an isotope? Why or why not?
Answer:
It would be an isotope.
Background Information:
Isotopes are typically elements that have a different number of protons than neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.
Explanation:
If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then we can simply take away the amount of protons from that number, 18 - 8 = 10. If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons we know that this particular atom is an isotope.
It would be an isotope.
IsotopeIsotopes are elements that have the same number of electrons and protons but different numbers of neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.
If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then protons
18 - 8 = 10
If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons. So, the particular atom is an isotope.
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Sodium bicarbonate is the chemical name for baking powder. Its chemical formula is NaHCO3. What does the subscript 3 mean?
A.
There are three molecules of sodium bicarbonate.
B.
There are three molecules of oxygen in sodium bicarbonate.
C.
There are three atoms of oxygen in sodium bicarbonate.
D.
There are three atoms of sodium bicarbonate.
Answer:
A
Explanation:
When a metal atom gains electrons it forms an anion.
Always true
Sometimes true
Never true
List 4 properties of ironically boned compound
Answer:
do u mean ironically? if so here are some:
they're hard and very brittle!!
good insulators
contain high melting points
the form crystals