Answer:
Neon and helium
Explanation:
Help! Will go be brianleist
Answer:
d
Explanation:
Answer: c
Explanation:
which scientist is credited with early, quantitative data on redox reactions?
Answer:
German chemist G.E. Stahl
Explanation:
this theory was first articulated in 1697
G. E. Stahl in 1697 is the scientist who is credited with early, quantitative data on redox reactions.
What are redox reactions?
The Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.
While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.
The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.
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3. Which of the following are examples of chemical changes? Select all that apply.
-Water freezing
-Cookies baking
-Dry Ice subliming
-Wood burning
Answer:
wood burning and cookies baking
Explanation:
took the test <333
Answer:
Wood burning and cookies baking
Explanation:
write name of the functional group
Answer:40=6*6(6+5)8x42
Explanation: so yea
In general the state of matter with the most energy is ?
Gas
Gas particles got the most energy because of how freely the molecules move
Hope this helped you, have a good day bro cya)
Investigation of ions and Separation of Mixtures 1- Propose systematic schemes for the identification of the following salts with respect to their anions and cations: NaCl, KNO3, and CuSO4?
The cations and anions can be identified using cataloged reactions schemes. For instance, the copper II ion can be identified by reaction with sodium hydroxide.
The sodium cation is easily identified by flame test. sodium imparts a yellow color to a flame. The chloride ion is identified by the use of a mixture of HNO3/AgNO3 solution. The color of the precipitate shows which halide ion is present. A white precipitate indicates the presence of the chloride ion.
The potassium cation is also identified by flame test. The ion imparts a lilac color to flame. Addition of acidified FeSO4 solution is used to confirm the presence of the nitrate ion. Formation of a brown ring is a positive test for the nitrate ion.
For CuSO4, the presence of copper II ion can be confirmed using dilute NaOH. If a light blue precipitate is formed which dissolves in excess NaOH then the copper II ion is confirmed. The presence of the sulfate ion is confirmed using a solution of barium nitrate and dilute nitric acid. Formation of a white precipitate is a positive test for the sulfate ion.
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Using a lamp without a shade and a baseball, Juan turned on the lamp and placed it on one side of a darkened room. He sat on the other side of the room and held the baseball between his face and the lamp.
Based on the model, what would the final step of his model?
Answer:b
Explanation:
How many grams are in 2.5 moles of dicarbon hexahydride?
Round to 2 significant figures!
There are 75 grams in 2.5 moles of dicarbon hexahydride (C₂H₆).
The given parameters;
dicarbon hexahydride = [tex]C_2H_6[/tex] number of moles of the dicarbon hexahydride = 2.5 molesThe molecular mass of dicarbon hexahydride is calculated as follows;
Mw = C₂H₆ = (2 x 12) + (6 x 1)
Mw =30 g/mol
The mass of the dicarbon hexahydride in the given number of moles is calculated as follows;
mass = n x Mw
mass = 2.5 x 30
mass = 75 g
Thus, we can conclude that there are 75 grams in 2.5 moles of dicarbon hexahydride (C₂H₆).
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Someone pls help me I will make you you brain
Answer:
i have no clue
Explanation:
umm cause i have no clue sorry lol but good luck
Claim: An ecosystem can survive with only producers.
Do you agree or disagree with this claim? Explain your answer. Be sure to include evidence and reasoning.
Answer:
No.
Explanation:
The reason for this is if everything in an ecosystem was a producer there would be nothing consuming and soon the ecosystem would be overwhelmed by two many products and nothing to consume them. A healthy ecosystem is a balanced cycle that makes sure everything is working properly and everything benefits something else. A food chain of sort is often seen in a balances ecosystem to show how everything is useful and needed. So in answer if there were only producers an ecosystem wouldn't thrive at its full potential, if at all.
I hope this helped! Brainliest if it did? No pressure!
Have a great day! :D
Someone pls help me I will make you brain
Answer:
the second answer
Explanation:
Answer:
A Erosion of structures and buildings
Explanation:
How do we determine the volume of an irreguler shaped object?
Answer:
You can measure the displacement when the object is placed in a certain volume of water.
Gravity relates to a stream's ability to erode and deposit material by causing water to flow faster down a steep slope. True or False
Answer:
true
Explanation:
Which statement best explains the difference between polar and nonpolar covalent bonds?(1 point)
Polar covalent bonds give/take electrons, while nonpolar covalent bonds share electrons.
Polar covalent bonds share electrons equally, while nonpolar covalent bonds share electrons unequally.
Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.
Polar covalent bonds share electrons, while nonpolar covalent bonds give/take electrons.
Covalent bonding can be defined as the sharing of electrons between two atoms.
The statement which best explains the difference between polar and nonpolar covalent bonds is "Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally"
We have:
Polar covalent bond is a chemical bond in which electrons are shared unequally or unevenly between two atoms. Non-polar covalent bond is a chemical bond in which electrons are shared evenly or equally between two atoms.Therefore, the statement which best explains the difference between polar and nonpolar covalent bonds is "Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally"
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calculate the kinetic energy of a baseball (mass = 5.25 oz) with a velocity of 1.0 x 10^2 mi/h
Answer:
262.5 Joules
Explanation:
You find the kinetic energy of multiplying half of the mass by the velocity. In this word problem it tells you the mass so you divide it by 2. That answer is 2.625, you then multiply that by the velocity, in this instance it's 1.0 x 10^2 mi/h.
The unit in kinetic energy is Joules. This is actually a really important part in chemistry and physics.
The kinetic energy of a baseball (mass = 5.25 oz) with a velocity of 1.0×10² mi/h is 147.88 joules.
How do we calculate kinetic energy?Kinetic energy of any object will be calculated by using the below equation:
K.E. = 1/2(mv)², where
m = mass of object in kg = 5.25 oz = 0.148 kg
v = velocity in m/sec = 1.0×10² mi/h = 160934 m/h = 44.704 m/s
On putting values on the above equation, we get
K.E. =1/2(0.148)(44.704)²
K.E. = 147.88 joules
Hence required kinetic enrgy is 147.88 joules.
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True or false
9.Circuit breaker is used to protect the user of appliance from an electrical shock.
10.Earthing or Grounding involves attaching to the ground a conductor in one line of the circuit to make that line electrically common with the earth. *
Answer:
1. true
2. false
Explanation:
PROMISE PROMISE to make the most of the su in the WORLD CUP and chemica are u doing the meetings with
Bohr models do not correctly show the location of electrons in an atom explain why they are still useful to predict bonding of atoms
Answer:
looo
rdyxvxkxkvxkgxkgdkvx
Explanation:
lolollkvvbffffkhdhlxkgzfjzufsfjsdhayzyrzruzruzufzktzkgdjfdufskdgjgzjfgkzjgskf
A horse runs 1 km in 15 s. What is the average speed
The average speed of the horse for the entire motion is 66.67 m/s.
The given parameters;
distance traveled by the horse, d = 1 km = 1,000 mtime of motion of the horse, t = 15 sThe average speed of the horse is calculated by dividing the total distance traveled by the horse by the time of motion.
The average speed of the horse is calculated as follows;
[tex]average\ speed = \frac{distance}{time} \\\\average\ speed = \frac{1000 \ m}{15 \ s} = 66.67 \ m/s[/tex]
Thus, the average speed of the horse for the entire motion is 66.67 m/s.
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in which step of the scientific method do we want to use graphs
Explanation:
The next step in the scientific method is to analyze the data. Data analysis is the process of interpreting the meaning of the data we have collected, organized, and displayed in the form of a table or graph.
differentiate between atomic mass and atomic number
Answer:
The major difference between atomic number and mass number is that the atomic number states the number of protons present in an atom whereas, the mass number indicates the total of the number of protons and the number neutrons present in an atom.
Explanation:
Someone pls help me I will make you brain
Answer:
A
Explanation:
I talked about it in Economic Geography and Earth Science, I rememBer this
help pls now now now
5- perfume sprayed in the air
6- I'm really sorry but I'm not sure
Helppppp I need it ASAP
What type of reaction is represented by the chemical equation shown
below?
2PbO2 → 2PbO + O2
decomposition
single replacement
synthesis
deouble replacement
Answer:
Decomposition reaction
Explanation:
2PbO2 → 2PbO + O2
2PbO2 is reactant.
2PbO + O2 is the product.
Definition : -
Decomposition reaction is a chemical reaction in which a single reactant breaks down to simpler products.
How to determine the speed of light.
Please, if you wish not to receive multiple notifications, ignore answering this, for which you will be stressed and annoyed.
Answer:
Hey mate....
Explanation:
This is ur answer....
By adjusting the path length while observing the interference pattern and carefully measuring the change in path length, the wavelength of the light (λ) can be determined. The speed of light is then calculated using the equation c = λf.
Hope it helps!
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Which term describes the total internal energy of a material due to the motion
of its particles?
A. Nuclear energy
B. Thermal energy
Ο Ο Ο
C. Electrical energy
D. Chemical energy
Answer:
Thermal Energy
Explanation:
Thermal energy is the total internal kinetic energy of an object due to the random motion of its atoms and molecules They consist of the sum of the internal kinetic energy (thermal energy) and the potential energy of an object.
Answer:
B. thermal energy.
Thermal energy or heat is due to the movement or vibrations of tiny particles such as atoms and molecules.
Explination:
Einstein proved the existense of atoms through his observation of Brownian Motion (the random movement of a dust particle, caused by it bumping into atoms).
how does decreasing the temperature affect the volume of gas??
Answer: Well, when you decrease the temperature in a gas the volume will decrease as well as the pressure. Since, heating a gas or liquid increases the temperature/pressure. Therefore, it'd increase the volume but since the temperature is decreasing the volume of the gas does too.
Can someone help me please I would really appreciated
Explanation:
whats the question. cause I didn't see it
convert 1 bromopropane to bromoethane.
Answer:
The Dehydrohaogenation of 1-bromo propane with alcoholic KOH gives propene which on again hydrohalogenation with HBr gives 2-bromo propane due to Markonikove's rule for addition.
Explanation:
How many atoms are in 3 C2H6