Answer:
Louis Tomlinson, Emma Watson.
Explanation:
Thanks....you too ^_^
How is electromagnetic spectrum ( wavelength & frequency) used to make calls on our cellphones?
Answer:
Cell phones use radio waves to communicate with cell towers, and these waves have wavelengths of approximately 10-1000 m, which are much too large to be ionizing. WiFi actually operates at quite precise frequencies, either 2.4 GHz or 5 GHz, which correspond to wavelengths of either 12 cm or 6 cm.
Explanation:
When the mobile phone is turned on, it emits radio waves that consist of radio frequency (RF) energy—a form of electromagnetic radiation moving at the speed of light. It works by transmitting radio wave signals to (and receiving these from) nearby base stations.
what is the definition of an atomic radius
Answer:
iIllustrated Glossary of Organic Chemistry - Atomic radius. Atomic radius: The radius of an atom. This distance between an atom's nucleus and outer electron shell. ... Atomic radius differs with the bonding state of an atom (for example an nonbonded atom of an element versus the same element within a covalent bond).
A piece of word has a mass of 3.16 g; when placed in 20.0 mL of water, the water volume increased to 23.4 mL. What is the density of this piece of wood?
Answer:
0.93g/mL
Explanation:
Given parameters
Mass of wood = 3.16g
Initial volume of water = 20mL
Volume of water + wood = 23.4mL
Unknown:
Density of the wood = ?
Solution:
Density is the mass per volume of a substance.
It is mathematically expressed as;
Density = [tex]\frac{mass}{volume}[/tex]
Volume of wood = 23.4mL - 20mL = 3.4mL
So,
Density = [tex]\frac{3.16}{3.4}[/tex] = 0.93g/mL
If the mass ratio of K to F in a compound is 2.06:1, how many grams of F are needed to react with 101g of K?
Mass of F to react with 101 g of K = 49.03 g
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
With this law, we can calculate how many grams an element is needed to make a compound with a certain mass, as desired
The mass of compounding compounds can also be calculated.
For example, the mass ratio of oxygen (O) and hydrogen (H) elements in H₂O remains at 8: 1. So if you know the amount of mass of oxygen you can know the amount of hydrogen and water mass.
The mass ratio of K to F in a compound is 2.06:1, so the mass of F to react with 101 g of K :
[tex]\tt =\dfrac{1}{2.06}\times 101\\\\=\boxed{\bold{49.03~g}}[/tex]
A tank of oxygen has a volume of 40.0L and is held at a pressure of 159atm at 25∘C. What volume of O2 gas (in liters) would there be at normal body conditions, or 1.00atm and 37∘C?
Answer:
V2 = 6616 L
Explanation:
From the question;
Initial volume = 40L
Initial Pressure, P1 = 159atm
Initial Temperature T1 = 25 + 273 = 298K (Upon converting to Kelvin unit)
Final Volume, V2 = ?
Final Pressure, P2 = 1 atm
Final Temperature T2 = 37 + 273= 310K (Upon converting to Kelvin unit)
These quantities are related by the equation;
P1V1 / T1 = P2V2 / T2
V2 = T2 * P1 * V1 / T1 * P2
V2 = 310 * 159 * 40 / (298 * 1)
V2 = 6616 L
Why have scientists reasoned that Earth's outer core is liquid?
Because it is extremely hot.
A teacher wrote the following part of a balanced chemical equation Cu+2AgNO3
Answer: Cu + 2AgNO3 -> 2Ag + Cu(NO₃)₂
Explanation: Assuming the teacher wants you to finish the other side of the balanced equation, here is how I would do it.
I would consider this a Single Replacement equation. This means Ag will be Replaced with Cu. Using the chart provided, it can be seen that (NO₃) has a charge of ⁻ ¹ . Therefore, it can be assumed that Ag as a ⁺¹ charge as well. However, copper has a charge of ⁺² (we know this because there are 2NO3 in the first equation and therefore there needs to be 2 when copper replaces it) so when replacing Ag with Cu, some butterfly subscript multiplication needs to happen like the picture attached. So, finally, the equation is:
Cu + 2AgNO3 -> 2Ag + Cu(NO₃)₂
Which of these is NOT true about the outer core? Question 4 options: It is mostly made up of iron and nickel. It is mostly liquid. It has a higher temperature than the inner core. atoms within it form a powerful magnetic field.
Answer:
Of the mentioned statements the incorrect statement is that it has a higher temperature than the inner core.
Explanation:
Both the outer and the inner core are formed of identical constituents chemically, that is, both are formed majorly of iron, with some quantity of nickel and some other chemical constituents. The difference is that the inner core is solid, while the outer core is liquid in the state. As one goes deeper, both the pressure and the temperature because of the weight of the overlying rock gets an increase.
The outer core is liquid in the state as the temperature is so much that the melting of iron takes place. However, the inner core is hotter in comparison to the outer core, but it is solid as the pressure is so much that it makes the atoms of the constituents to come so close to each other that they turn solid.
Answer:
It has a higher temperature than the inner core.
Explanation:
The inner core is indeed hotter than the outer core, is mostly composed of liquid iron and nickel, and magnetism in the outer core is about 50 times stronger than it is on the surface.
I NEED HELP QUICK PLEASE
Which of the following describes a likely energy transformation for a computer monitor?
potential energy to mechanical energy
light energy to electrical energy
electrical energy to sound energy
chemical energy to kinetic energy
electrical energy to sound energy i think but im not sure
What is the periodic table arrangement?
Answer: the top to bottom are periods and left to right are groups
Explanation: the periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
Fill in the blank with the correct number to balance the equation: 4Al + O2 → 2Al2O3. (Enter only a whole number.)
Answer:
3
Explanation:
You have to balance the atoms. On the right side there are 6 oxygen. In order to get the other side even you need a 3 coeficcient to get 6 oxygen on the left. That is the best way I can explain it.
The energy of a pendulum is recorded at different positions in the table below. Use the data in the table to determine the amount of kinetic energy the pendulum had at Position 2. dude i will give yall brainlest
Answer:
36.55 J
Explanation:
PE = Potential energy
KE = Kinetic energy
TE = Total energy
The following data were obtained from the question:
Position >> PE >>>>> KE >>>>>> TE
1 >>>>>>>> 72.26 >> 27.74 >>>> 100
2 >>>>>>>> 63.45 >> x >>>>>>>> 100
3 >>>>>>>> 58.09 >> 41.91 >>>>> 100
The kinetic energy of the pendulum at position 2 can be obtained as follow:
From the table above, at position 2,
Potential energy (PE) = 63.45 J
Kinetic energy (KE) = unknown = x
Total energy (TE) = 100 J
TE = PE + KE
100 = 63.45 + x
Collect like terms
100 – 63.45 = x
x = 36.55 J
Thus, the kinetic energy of the pendulum at position 2 is 36.55 J.
Help, please!! If an object with a mass of 4.2 kg accelerates at 2.6 m/s2, what was the force exerted?
a.4.2n
b.10.92n
c.10.92kg
d.20n
A piece of unknown metal absorbed 790.24 J of heat as it was heated from 40.0°C to 72.0°C. If the piece of metal weighed 55.0 g, what is the identity of the metal?
Answer:
Given metal is iron
Explanation:
Given data:
Heat absorbed = 790.24 J
Initial temperature = 40.0 °C
Final temperature = 72.0 °C
Mass of metal = 55.0 g
Identity of metal = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 72.0°C - 40.0°C
ΔT = 32 °C
790.24 J = 55 g ×c × 32 °C
790.24 J = 1760 g. °C ×c
c = 790.24 J /1760 g. °C
c = 0.449 J/g. °C
The specific heat capacity of iron is 0.449 J/g. °C thus, given metal is iron.
Which of the following statements regarding physical and chemical changes is true?
What do oxygen, silicon, and selenium have in common? How might this relate to their organization on the periodic table?
Answer:
They all belong to the p block in the periodic table
Explanation:
Let us examine the electronic configuration of each element;
Oxygen - [He] 2s2 2p4
Silicon - [Ne] 3s2 3p2
Selenium - [Ar] 4s2 3d10 4p4
A common thread that joins all the elements listed above is that they all belong to the p-block in the periodic table. They could be collectively referred to as p-block elements.
Write a causal question based on the information in the passage
Answer:
Casual is like hello sup dude
Explanation:
Is this statement true or false?
Global warming is likely the result of human activity
Answer:Explanation:
This is True.
Answer:
True.
Explanation:
If humanity was never a thing or if humanity was a thing but the average human being is able to take care of the environment, then no damage would be caused and Global Warming would probably not exist.
Why are ethics important when considering experiments?
A. A general sense of ethics ensures that everyone is aware of what's
right and what's wrong.
B. The scientific results would not be believable if they were obtained
unethically
C. Scientists would not be able to get funding if their experiments
were not ethical
D. It is important that people are not harmed for the sake of science,
Answer:
C. is the correct answer
Explanation:
I took the test
Consider the equation below
plz help don't just give answer explain so i can understand
The equilibrium constant : Kc=[CO₂]
Further explanationThe equilibrium constant is the value of the product in the equilibrium state of the substance in the right (product) divided by the substance in the left (reactant) with the exponents of each reaction coefficient
The equilibrium constant is based on the concentration (Kc) in a reaction
pA + qB -----> mC + nD
[tex]\large {\boxed {\bold {Kc ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}}[/tex]
Solid (s) and liquid (l) are not included in the calculation of Kc(only aq-aquoeus and g-gas)
From reaction
CaCO₃(s)⇔CaO(s)+CO₂(g)
Because CaCO₃ and CaO are solid, only CO₂ is included in the calculation
[tex]\tt Kc=[CO_2][/tex]
The compound XCI is classified as ionic if X represents the element:
1.
H
2.
1
3.
Rb
4.
Br
Answer:Rb
Explanation:
The compound XCI is classified as ionic if X represents the element Rb (Rubidium). Therefore, option 3 is correct.
What do you mean by ionic bond ?The term ionic bond is defined as the bond is formed when electrons are completely transferred from one element to another. One element in this bonding is always a metal, and the other is always a non-metal.
Chlorine is a group 17 and third period element. Chlorine has an atomic number of 17 and the element symbol is Cl.
The electronic configuration of the element chlorine is as follows :
1s₂,2s₂,2p₆,3s₂,3p₅.
Therefore, chlorine need one electron to become stable and form an ionic bond. Also, the ionic compound has the formula XCl which means that the valency of X is +1.
Thus, The compound XCI is classified as ionic if X represents the element Rb, option 3 is correct.
To learn more about the ionic bond, follow the link;
https://brainly.com/question/11527546
#SPJ2
The student inferred that a chemical reaction occurred what evidence supports this inference
1. What does the 1.00794 stand for?
1.
H
Hydrogen
1.00794?
Answer:
It stans for atomic mass
Which combination of elements would most likely form an ionic compound?
A sodium and fluorine
B. carbon and chlorine
C. hydrogen and oxygen
D. silicon and sulfur
Answer: not quite sure but I think A sounds best
Explanation:
Answer:
A. sodium and fluorine
Explanation:
What sublevel has five orbitals?
Answer:
Explanation:
Option D is the correct answer
Answer:
3d
Explanation:
answer D
What is a double displacement reaction?
A double displacement reaction is a type of chemical reaction where two compounds react, and positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.
For example:Na2S+2HCl→2NaCl+H2S
hope it's helpful :)
what makes turquoise a mineral
Answer:
Its Chemical CompositionExplanation:
The thing that makes turquoise a mineral is its chemical composition.
Turquoise's chemical composition is CuAl 6 (PO 4) 4 (OH) 8 ·4H 2 O
Which makes turquoise a mineral and gemstone.
Which means blue minerals are very rare.
Hope this helps! <3
What is the density of alunimium?
Answer:
2.7 g/cm³
Explanation:
Answer:
5000.9 mgl
Explanation:
bzbzbbxbdhuzuz
CH4 + 02 ----> CO2 + 2H2O
Balanced or unbalanced
Answer:
Hey mate here is your answer. Hope it helps you.
Explanation:
This equation is not balanced. The balanced equation is CH4+ 2O2———-> CO2+ 2 H2O.
Which element listed below is a nonmetal?
O A. sodium (Na)
O B. magnesium (Mg)
O C. iron (Fe)
OD. chlorine (CI)
Answer:
D: Chlorine( I may be wrong my chemistry year was a nightmare)
The awnser is chlorine (Cl) trust me