Answer:
.
Explanation:
The south end of the Earth's axis is tilted toward the sun, summer in the Southern Hemisphere and winter in the Northern Hemisphere. "Equal night", twice a year, when the noon sun is directly overhead the equator, day and night are almost exactly 12 hours each everywhere on earth! September 22 is autumn equinox.
Answer:
the northern hemisphere experiences fall
If you have 0.95 moles of FeCl3, how many moles of MgCl2 do you produce in the reaction
FeCl3 + Mg --> MgCl2 + Fe?
Please help!!
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.
What do ionic bonds form between?
Answer:
Ionic bonds form between cations and anions.
Explanation:
Electrovalent bonds (ionic bonds) form due to the electrostatic attraction between the two oppositely charged ions in the compound. A cation is formed when a metal ion loses a valence electron. Anions are formed the opposite way: a non-metal ion gains a valence electron.
What is force? Why?
How does a changing environment affect plant and animals threat live there
Explanation:
Changing the environment takes away habitats from animals and some nutrients plants need
Hope this helps :>
A real gas behaves most like an ideal gas at?
Sedimentary rock often contains
"strata". What are strata?
A. Large chunks
B. Noticeable layers
C. Grains of sand compacted together
D. Rocks from cooling magma
Answer:
Explanation:
Sedimentary rocks are formed from sediment grains deposited by water, wind or ice. They are always formed in layers, called “beds” or “strata”, and quite often contain fossils.
A signal is sent from a nerve cell to a muscle cell.
What is this an example of?
A:Meiosis
B:Cellular respiration
B:intracellular communication
D:intercellular communication
PLEASE HELP
Answer:
D:intercellular communication
Explanation:
Cellular respiration and meiosis have nothing to due with communication between cells. Intracellular communication is communication within the cell, leaving intercellular communication left as the correct answer.
A balloon contains 0.950 mol of nitrogen gas and has a volume of 25.5 L. How many grams of N2 should be released from the balloon to bring the volume to 17.3 L?
What sublevel has five orbitals?
Answer:
Explanation:
Option D is the correct answer
Answer:
3d
Explanation:
answer D
Covalent bonds normally form between which two types of elements?
Answer: Covalent bonds usually occur between nonmetals. In Covalent bond elements share their electrons.
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.
greater than
equal to
products
right
Answer:
.
Explanation:
a muddy stream quickly flows downhill. When it reaches a flatter area, the stream moves more slowly, and the water clears.Explain why the stream changes appearance.
Answer: it calms it down and it dries and evaporates easier?
Explanation: I think that's how to explain it but I rlly dont want to get it wrong but i need points to ask a question
a push or a pull between an object (many types)
Your answer
Answer:
your answer would be force
Explanation:
What does each column (down) have in common?
Answer:
elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons.
Every element in the second column (group two) has two electrons in the outer shell.
please help!!! i need help asap!!!
Newest crust is found at
a- divergent boundaries
b- subduction zones
c- continent-continent collisions
Gloria’s family built a new deck using building materials made from recycled plastic bottles. As they were heated, the plastics softened and were formed into new shapes. These plastics were ______________ solids, and their particles are arranged ________________ . These solids are different from __________________solids, which melt at a specific temperature. *
5 points
1. crystalline, vibrating, amorphous
2. amorphous, in no regular pattern, crystalline
3. amorphous, in a regular pattern, crystalline
2. crystalline, in no regular pattern, viscosity
Answer:2
Explanation:
Solid are divided into two based on arrangement of particles, one is amorphous solid and other is crystalline solids. Therefore the correct option is option 2.
What is amorphous solid?Amorphous solid is a solid which is not crystalline and whose atoms are not arranged in regular pattern. particles are randomly arranged. Whereas in crystalline solids particles are arranged in a particular fashion. Example of amorphous solid is plastic, glass etc. Example of crystalline solids are all salts like sodium chloride.
Plastics are amorphous solids, and their particles are arranged in no regular pattern. These solids are different from crystalline solids, which melt at a specific temperature.
Therefore the correct option is option 2 that is amorphous, in no regular pattern, crystalline
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Endocrine disruptors are commonly found in
a. pesticides
b. plastics and consumer products
c industrial by-products
d. all of the above
help pls!!!!
Answer:
d
Explanation:
edge2020
Endocrine disruptors are commonly found in pesticides, plastics, and consumer products, and industrial by-products. Thus, the correct option for this question is D, i.e. all of the above.
What do you mean by Endocrine disruptors?Endocrine disruptors may be defined as a type of extrinsic substance or mixture that significantly changes the function of the endocrine system and subsequently stimulates adverse health effects in an intact organism, its offspring, or populations.
According to the context of this question, pesticides like DDT, Atrazine, etc. plastics, and food storage materials like bisphenol A (BPA), Phthalates, Phenol, etc., and industrial by-products Polychlorinated biphenyls (PCBs) and Dioxins causes the significant and effective disruptions of the endocrine system.
Endocrine disruptors are found in numerous everyday products, including plastic bottles and containers, liners of metal food cans, detergents, flame reductions, food, and pesticides.
Therefore, endocrine disruptors are commonly found in pesticides, plastics, and consumer products, and industrial by-products. Thus, the correct option for this question is D, i.e. all of the above.
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If yttrium loses three electrons to be similar to Krypton (to try and become Royal), what type of ion does it become.
Answer:
.
Explanation:
Did u get ur answer dear?
A compound with one phosphorous and five chlorine atoms would have the formula
Answer:
PCl5
Explanation:
1 Phosphorus (P)
5 Chlorine (Cl)
P1Cl5 =
PCl5
please mark brainliest
PCl(5)
Explanation:
P is phosphorous, chlorine is Cl
P(1atom) CL(5atoms)
We don't need to write the 1 atom for the P.
So PCl5
Make sure the 5 is the tiny lowercase.
what are true about bonds
Answer:
a.
Explanation:
what is the formula for Li1+ and F -1, and the IUPAC name for it too?
Answer:
stupid
13
Explanation:
HELP ASAP I NEED HELP FAST PLEASE
Kinetic energy is often referred to the energy of
Question 1 options:
A)work
B)mass
C)motion
D)force
)
Question 2 (1 point)
Saving...
Which example has the least kinetic energy
Question 2 options:
A)a 10 kg rock rolling down a hillside at 100 m/s.
B)a 100 kg rock rolling down a hillside at 100 m/s.
C)a 1 kg rock rolling down a hillside at 1 m/s.
D)a 100 kg rock rolling down a hillside at 1 m/s.
Question 3 (1 point)
Saved
The law of conservation of energy states that
Question 3 options:
energy can be created but not destroyed.
energy can neither be created nor destroyed, only change forms.
energy can be destroyed but not created.
Question 3 (1 point)
Saved
The law of conservation of energy states that
Question 3 options:
A energy can be created but not destroyed.
B energy can neither be created nor destroyed, only change forms.
C energy can be destroyed but not created.
D energy never changes
Which is an example of an object increasing its kinetic energy
Question 4 options:
A a train stopped at the station.
B an airplane after landing on a level runway.
C a mouse running faster after spotting a cat.
D a rocket before launch.
Question 5 (1 point)
Identify when an object has a kinetic energy of zero joules.
Question 5 options:
A when an object is no longer in motion.
B when the energy has been destroyed.
C just after a ball it leaves your hand pitching a ball.
D as a pendulum swings downward.
Which is NOT an example of kinetic energy
Question 6 options:
A an elevator moving up to the 3rd floor.
B a skateboard rolling down a hill.
C an arrow after it has hit the target and is at rest.
D a skydiver as they decrease speed after opening their parachute.
Answer:
kinetic energy is referred to as the energy of motion (particles are always moving). so the answer is c).
Which of the following compounds has a lower boiling point?
Li2O
H₂O
KCI
MgCl2
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]
A gas is trapped in a 56 liter vessel. The temperature inside is 234 Celsius and thepressure is 1.1 atmospheres. What is the new pressure if the volume is compressed to54 liters and the temperature is lowered to 200 oC?
Answer:
The new pressure is 1.06 atmospheres
Explanation:
We can calculate the new pressure from using the Combined gas law equation.
The combined gas law equation is
[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
Where [tex]P_{1}[/tex] is the initial pressure
[tex]V_{1}[/tex] is the initial volume
[tex]T_{1}[/tex] is the initial temperature
[tex]P_{2}[/tex] is the final pressure
[tex]V_{2}[/tex] is the final volume
and [tex]T_{2}[/tex] is the final temperature
From the question,
[tex]V_{1}[/tex] = 56 L
[tex]T_{1}[/tex] = 234 °C = (234 + 273.15)K = 507.15K
[tex]P_{1}[/tex] = 1.1 atm
[tex]V_{2}[/tex] = 54 L
[tex]T_{2}[/tex] = 200 °C = (200 + 273.15)K = 473.15K
Now, to determine [tex]P_{2}[/tex] (the new pressure), we will put the given values into the equation
[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
[tex]\frac{1.1 \times 56}{507.15}= \frac{P_{2} \times 54 }{473.15}[/tex]
∴ [tex]P_{2} = \frac{1.1 \times 56 \times 473.15 }{54 \times 507.15}[/tex]
Then,
[tex]P_{2} = \frac{29146.04 }{27386.1}[/tex]
[tex]P_{2} = 1.06[/tex] atm
Hence, the new pressure is 1.06 atmospheres.
Write the balanced molecular equation for the acid-base reaction that occurs when aqueous solutions of hydrochloric acid (HCl) and sodium hydroxide (NaOH) are mixed.
Answer:
NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)
Explanation:
Sodium hydroxide (NaOH) is a strong base and hydrochloric acid (HCl) is a strong acid. That means that they are totally dissociated into ions in aqueous solution.
When a solution of NaOH is mixed with a solution of HCl, a neutralization reaction occurs, in which a salt (NaCl) and water (H₂O) are formed.
The balanced molecular equation for this reaction is:
NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)
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.
Which of the following substances are soluble in water? Select all that apply.
a. NaCl
b. AgCl
c. AgNO3
d. KNO3
A, C and D are soluble in water.
What is solubility?Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
Salt (sodium chloride) is made from positive sodium ions bonded to negative chloride ions. Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions.
AgCl is also not soluble in water because the forces favouring the formation of silver hydroxide (AgOH) are too weak to break the ionic bonds between silver and chlorine in AgCl. That means a bond between silver cation and the chloride ion is strong.
Silver nitrate is highly soluble in water but is poorly soluble in most organic solvents, except acetonitrile. It readily dissolves in water due to its strong ionic properties.
Potassium nitrate ([tex]KNO_3[/tex]) crystals were insoluble in water at room temperature. Heating the solution increases the solubility of the crystals in water.
Hence, A, C and D are soluble in water.
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