Answer:
When atoms have fewer than eight electrons, they have an inclination to react and type a lot of stable compounds.
Thus, associate atom continues to create bonds till associate octet of electrons is formed. this can be called octet rule by Lewis.
1.what is the mass of an atom.
2.what is the difference between an ion and atom.
Answer: Atoms are single neutral particles, and an ion is a positively or negatively charged particle.
Explanation:
water is a substance made up of elements hydrogen and oxegyn....How many types of atoms make up a particle of water?
ОА. 4
ОВ. 1
С. 2
D.3
Answer:
C
Explanation:
Just took the test
12.
Carboxylic acids react with alkalis to produce salt and water.
+
+
CH, COOH
NaOH
Ethanoic acid Sodium hydroxide
NaCH COO
Sodium ethanoate
но
Water
a. What mass of water would be produced if 1.5 g of ethanoic acid was reacted completely
with sodium hydroxide?
Show your working clearly.
3
Mass of water : 0.45 g
Further explanationGiven
1.5 g ethanoic acid
Required
Mass of water
Solution
Reaction
CH₃COOH + NaOH ⇒H₂O + CH₃COONa
mol CH₃COOH(MW=60 g/mol) :
= mass : MW
= 1.5 : 60
= 0.025
mol H₂O from the equation :
= 0.025(mol ratio CH₃COOH : H₂O= 1 : 1)
Mass of water :
= mol x MW water
= 0.025 x 18 g/mol
= 0.45 g
Plants use energy to survive. They use the Sun's energy to make the food that they need to grow and develop. Which energy sequences BEST describe the transformation that takes place in
plants?
1.Solar>chemical>heat
2.Solar>heat>chemical
3.Heat>nuclear>chemical
4.Heat>light>chemical
Answer:
second one... maybe
hope it helps :-)
stars have a larger gravitational force then planets
Calculate the heat, in joules, needed to warm 225 grams of water from 88.0ºC to its boiling point, 100.0ºC.
Answer:
The heat needed to warm 225 grams of water from 88.0ºC to its boiling point, 100.0ºC, is 11,296.8 J
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
In this way, between heat and temperature there is a direct proportional relationship (Two quantities are directly proportional when there is a constant, so that when one of the quantities increases, the other also increases; and the same happens when either of the two decreases.) . The constant of proportionality dependent on the substance that constitutes the body and its mass, and is the product of the specific heat and the mass of the body. So, the equation that allows to calculate the calorie exchanges:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature
In this case:
c= 4.184 [tex]\frac{J}{g*C}[/tex] m= 225 gΔT= Tfinal - Tinitial= 100 C- 88 C= 12 CReplacing:
Q= 4.184 [tex]\frac{J}{g*C}[/tex] *225 g* 12 C
Solving:
Q= 11,296.8 J
The heat needed to warm 225 grams of water from 88.0ºC to its boiling point, 100.0ºC, is 11,296.8 J
What volume of hydrogen gas, when combined with nitrogen gas,
is necessary to produce 16.0 L of ammonia gas (NH3)?
The volume of Hydrogen gas : 24 L
Further explanationGiven
16 L Ammonia(NH₃)
Required
The volume of Hydrogen gas
Solution
Reaction
N₂ + 3H₂ ⇒ 2NH₃
Avogadro's hypothesis:
In the same T,P and V, the gas contains the same number of molecules
So the ratio of gas volume will be equal to the ratio of gas moles
V₁/n₁=V₂/n₂
From the equation, mol ratio of H₂ : NH₃ = 3 : 2, so volume of H₂ :
= 3/2 x volume of NH₃
= 3/2 x 16 L
= 24 L
A sample of gas occupies a volume of 22.3 mL . As it expands, it does 131.5 J of work on its surroundings at a constant pressure of 777 Torr . What is the final volume of the gas?
Answer:
1.29L
Explanation:
The equation that represents the change in energy for the expansion of a gas under constant pressure is:
W = PΔV
Where W is work in atmL, P is pressure in atm and ΔV is change in volume in liters
Work in atmL:
131.5J * (1atmL / 101.325J) = 1.298atmL
P in atm:
777 torr * (1atm / 760torr) = 1.022atm
ΔV is:
W / P = 1.298atmL / 1.022atm = 1.27L
As initial volume of the gas is 22.3L = 0.0223L
Final volume = 1.27L + 0.0223L =
1.29LThermal energy is the energy associated with
O electric fields.
O being stored in chemical bonds.
O the pull of gravity.
O temperature.
Answer:
I think temperature. sorry if the answer is wrong
Thermal energy is the energy associated with temperature. Therefore, the correct option is option D.
What is thermal energy?
By virtue of its temperature, a system in a condition of thermodynamic equilibrium has thermal energy, or internal energy. Unlike the energy of systems which are not in a state of thermodynamic equilibrium, thermal energy cannot be transformed into meaningful work as quickly.
For instance, the energy contained in a flowing fluid or perhaps a moving solid can be used to create mechanical work in a windmill or even a waterwheel, yet a single fluid or solid with the same energy in a thermal equilibrium state cannot produce mechanical work unless it's combined with some other substance at such a different temperature. Thermal energy is the energy associated with temperature.
Therefore, the correct option is option D.
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What’s in the gaps...
Answer:
Faster
number
reactants
increases
Explanation:
The rate of reaction refers to how fast or slow a reaction occurs. The rate of reaction is dependent on factors such as surface area, concentration, temperature, nature of reactants, catalyst etc.
The concentration refers to the amount of reactants present. When the acid is made more concentrated, its amount is increased. This increases the number of collisions between the acid particles and the marble chips ultimately leading to increase in the rate of reaction according to Arrhenius theory.
Help!! This is due today and I have no clue what these are ://
(will give brainliest to the most helpful answer :D )
Help! I need to turn this in ASAP.
Answer: Potassium, Carbon and Oxygen, third option.
Explanation: K= Potassium, C= Carbon, O=Oxygen
plssss help asapp
will give brainliest!!!
Answer:
Mass of MgO = 36.27 g
Mg produced less number of moles of MgO it will act as limiting reactant while oxygen is present is in excess.
Explanation:
Given data:
Number of moles of Mg = 0.9 mol
Number of moles of O₂ = 1.1 mol
Number of moles of MgO = ?
Which reactant is in excess = ?
Which one is limiting reactant = ?
Solution:
Chemical equation:
2Mg + O₂ → 2MgO
now we will compare the moles of MgO with oxygen and magnesium.
Mg : MgO
2 : 2
0.9 : 0.9
O₂ : MgO
1 : 2
1.1 : 2/1×1.1 = 2.2
Mg produced less number of moles of MgO it will act as limiting reactant while oxygen is present is in excess.
Mass of MgO:
Mass = number of moles × molar mass
Mass = 0.9 mol × 40.3 g/mol
Mass = 36.27 g
When blood moves around the body, it
A. Circulation
B. Pumping
C. System
D. Circulates
Answer:d
Explanation:
Help please she need evidence!!!!!!???
Answer:
nah
Explanation:
dont wast my points
What is the name ?
Organic Chemsitry
Answer:
The term organic chemistry originally meant the chemistry of compounds obtainable from plants and animals
Help, does anyone know this answer?
Answer:
1.53
Explanation:
The acceleration of gravity is 9.8 i believe. To get force divide 15kg by 9.8 and you should get 1.53( rounded to hundredth)
What happens in nuclear fission reactions?
Answer:
in nuclear fission, an unstable atom splits into 2 or more smaller pieces that are more stable and releases energy in the process. the fission process also releases extra neutrons which can split additional atoms, resulting in a chain reaction that releases a lot of energy
Answer:
A nucleus is divided into more than one nucleus
Explanation:
Air pressure is caused by: gas particles striking the walls of a container or an object. b. gas particles are taking a test gas particles reaching 0 degrees Kelvin d. Air pressure has nothing to do with gas.
Answer:
D
Explanation:
7. Which of the following is most likely to produce an ionic bond? *
Al and F
P and H
C and N
Si and Br
Answer:
AL and F
Explanation:
ionic bonds occur through a metal and a non metal
Oceans cover over 70% of Earth's surface, and precipitation constantly adds freshwater to the oceans. Yet, ocean levels remain relatively constant. Which of the following is the best explanation for why ocean levels remain constant?
A.Ocean water is continually changing from a liquid state into a vapor.
B.
Ocean water is continually seeping underground into the ocean floor.
C.
Humans alter the level of the oceans due to our need for drinking water.
D.
It is difficult to change the ocean levels due to the large size of the oceans.
Answer:
D.
Explanation:
I had looked it up on the quiz site
Answer:
A
Explanation:
i thought b but majorities of water companies dont use ocean water and use waters from rivers,and lakes yk
Which is NOT a form of electromagnetic radiation?
radio waves
sound waves
x-rays
gamma waves
Sound waves is not the form of electromagnetic radiation.
The information regarding electromagnetic radiation is as follows:
It is the type of radiation that involved the radio waves, gamma rays, X-rays, visible light where the fields of electric and magnetic should be changed on the instant basis.Therefore we can conclude that sound waves is not the form of electromagnetic radiation.
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DESPERATE WILL GIVE BRAINLIST AND THANKS
Which phase of cell division is shown?
prophase
metaphase
anaphase
telophase
anaphase
or if not
telophase
YOU MUST SHOW ALL STEPS OF THE G.U.E.S.S. METHOD CORRECTLY. NO UNITS=WRONG ANSWER
Q: wave is traveling with a frequency of 2424 Hz and has a wavelength of 0.5 meters. What speed is this wave going?
Answer:
The equation for wave speed can be used to calculate the speed of a wave when both wavelength and wave frequency are known. Consider an ocean wave with a wavelength of 3 meters and a frequency of 1 hertz. The speed of the wave is: Speed = 3 m x 1 wave/s = 3 m/s.
SO... take your meters and hezert and do tha same
Explanation:
Plz mark me as brainlyist
Why should batteries be stored in the fridge when not being used?
Answer:
it helps them retain their charge longer
Explanation:
:)
Your answer
Why is sulfur often removed from fuels before they are burnt? *
1 poi
So the fuel produces less soot when it burns.
To reduce the cost of the fuel.
To reduce acid rain.
Which of these is not produced when a fuel undergoes completo
Answer:
To reduce acid rain.
Explanation:
Sulfur often removed from fuels before they are burnt because when sulfur is burned it get converted into sulfur dioxide and when sulfur dioxide mix with atmosphere, it can cause acid rain which is very harmful.
So, in order to reduce acid rain, sulfur often removed from fuels before they are burnt.
Hence, the correct answer is "To reduce acid rain."
What numbers balance Pb + H3PO4 —>Н2 + Pb3(Ро4)2
Answer:
3Pb + 2H3PO4 —> 3H2 + Pb3(РO4)2
Explanation:
Pb + H3PO4 —>Н2 + Pb3(РO4)2
In order to balance the equation you must look at the number of elements already in the equation.
We see, on the left side, that:
Pb = 1, H = 3, P = 1, and O = 4
We see, on the right side, that:
Pb = 3, H = 2, P = 2, and O = 8
Our goal is to balance these numbers so that they are equal. This is because of the law of conservation of matter states that "the amount of matter stays the same, even when matter changes form".
We cannot change the subscripts, so we add coefficients.
3Pb + 2H3PO4 —> 3H2 + 1Pb3(РO4)2
Now, on the left side:
Pb = 3, H = 6, P = 2, and O = 8
And, on the right side:
Pb = 3, H = 6, P = 2, and O = 8
So, the balanced equation is: 3Pb + 2H3PO4 —> 3H2 + Pb3(РO4)2
*I hope that this helped you. Have a great day & good luck!
how many atoms are in 5.5 moles of carbon dioxide
Answer: I think the answer is, 3.312177825e+24 atoms
Explanation: I had a problem similar to this, Hope this helps!
Answer:
So if you have 5 mole, you have: 5 x (6.022 x 10^23) = 3.011 x 10^24 atoms.
Explanation:
Basically the answer is 44.0095 :)) have a great day!!
Fluorine gas reacts with zinc (II) chloride →
Answer:
Zinc Chloride + Difluorine -----> Zinc Fluoride + Dichlorine
Explanation:
ZnCl2 + F2 → ZnF2 + Cl2
A plane flies from NY to LA at a constant speed of 800 km/hr. How long will it take the plane to fly the 4200 km? 5
As the plane plane flies at a constant speed of 800 km/hr the plane will take 5 hours 25 minutes to fly distance of 4200 km.
What is speed?Speed is defined as the rate of change of distance with time. It has the dimension of distance by time. Thus, the SI unit of speed is given as the combination of the basic unit of distance and the basic unit of Time. Thus, the SI unit of speed is metre per second. In everyday life, kilometre per hour or in countries like US and UK miles per hour are used as the unit of speed.
The SI unit of speed can be derived from the formula of velocity. Basically, velocity is the vector equivalent of speed. Mathematically, velocity is given as the ratio of displacement to the time taken.So, 800 km is traveled in 1 hour so 4200 km will be traveled 4200/800=5.25 which is 5 hours and 25 minutes.
Thus, the plane will take 5 hours 25 minutes to fly distance of 4200 km.
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