Answer:
A chemical reaction occurs when reactants are converted into products. A chemical equation is a representation of a chemical reaction using chemical symbols. The chemical equation also indicates the physical state of the reactants and products. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
Explanation: because UwU
A chemical equation is an expression that gives the identities and quantities of a chemical reaction. A chemical equation shows the reactants on the left side and the products on the right which are separated by an arrow.
What is the chemical equation?A chemical equation is the representation of a chemical reaction in terms of symbols of the substances. A chemical equation consists of reactants participating in the reaction, formed products, and an arrow showing the direction of the chemical reaction.
The equation in which the number of atoms of substances is equal on either side of the equation is called a balanced chemical equation.
The law of conservation of mass follows by a balancing of a chemical equation. According to this law, in a chemical reaction, the mass can neither be created nor destroyed.
By obeying this law, the total mass of the elements present on the reactant side should be equal to the total mass of elements present on the product side in a balanced chemical equation.
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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.
1. What does the 1.00794 stand for?
1.
H
Hydrogen
1.00794?
Answer:
It stans for atomic mass
Why have scientists reasoned that Earth's outer core is liquid?
Because it is extremely hot.
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.
greater than
equal to
products
right
Answer:
.
Explanation:
what are true about bonds
Answer:
a.
Explanation:
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.
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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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.
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!!
What sublevel has five orbitals?
Answer:
Explanation:
Option D is the correct answer
Answer:
3d
Explanation:
answer D
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.
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?
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]
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.
please help!!! i need help asap!!!
Newest crust is found at
a- divergent boundaries
b- subduction zones
c- continent-continent collisions
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
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.
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)
a push or a pull between an object (many types)
Your answer
Answer:
your answer would be force
Explanation:
what is the formula for Li1+ and F -1, and the IUPAC name for it too?
Answer:
stupid
13
Explanation:
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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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 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.
Covalent bonds normally form between which two types of elements?
Answer: Covalent bonds usually occur between nonmetals. In Covalent bond elements share their electrons.
Which of the following compounds has a lower boiling point?
Li2O
H₂O
KCI
MgCl2
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).
What is the density of alunimium?
Answer:
2.7 g/cm³
Explanation:
Answer:
5000.9 mgl
Explanation:
bzbzbbxbdhuzuz
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 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.