Answer:
hope it helps you
Explanation:
Once one shell is full, the next electron that is added has to move to the next shell. So... for the element of NEON, you already know that the atomic number tells you the number of electrons. That means there are 10 electrons in a neon atom.
Which of the following groups is not reactive? Circle all that apply.
a. Alkali metals
b. Alkaline earth metals
C. Halogens
d. Noble gases
CHEMISTRY
(a) A list of compounds is shown.
aluminium oxide
calcium bromide
calcium oxide
ethane
ethene
hydrogen chloride
methane
nitrogen dioxide
potassium iodide
potassium manganate(VII)
sodium chloride
Answer the following questions using only the compounds in the list.
Each compound may be used once, more than once or not at all.
Which compound:
(i) when in acidified solution, is used to test for sulfur dioxide
[1]
(ii) is the main constituent of natural gas
[1]
(iii) when dissolved in water, gives a yellow precipitate on addition of acidified aqueous
silver nitrate
.... [1]
(iv) is used in flue gas desulfurisation to neutralise acidic gases
(1)
(v) is a reactant used in the manufacture of ethanol?
[1]
(b) What is the meaning of the term compound?
[2]
1.The solution will gradually become colorless as the sulfur dioxide reacts with the potassium permanganate(Potassium manganate(VII))
The reaction
2MnO₄⁻ (aq) + 6H⁺ (aq) + 5SO₃²⁻ (aq) -> 2Mn²⁺ (aq) + 3H₂O (l) + 5SO₄²⁻ (aq)
2. Natural gas is a mixture of hydrocarbon gas with methane (CH₄) as the main composition in addition to other gases such as CO₂ and H₂
3. Halide ions are detected using silver nitrate (acidified using nitric acid) which forms deposits of different colors
Br-Bromide ions: cream
Cl-Chloride ions: white
I-Iodide ions: yellow
so the answer Potassium iodide
4. Compounds that are alkaline are useful for neutralizing acids including the desulfurization process to neutralize acidic gases (SO₃). The bases used are lime or caustic soda
Lime can be Calcium oxide (CaO - quicklime)
5. Ethanol (C₂H₅OH) can be made from C₂H₄ (ethene) with steam, apart from the Alcoholic fermentation of glucose
6. Compounds are formed from 2 or more types of elements which can be ionic compounds or covalent compounds
what is experiment ? explain in teacher's language
Answer:
A scientific experiment undertaken to make a discovery, to test a hypothesis or to demonstrate a known fact.
Explanation:
Experiment is described as attempting something new or testing a theory. An example of an experiment is when you try a new style of hair. An example of an experiment is when you use test tubes and chemicals in a chemistry lab to complete a project to try to better understand the chemical reactions.
Which coefficient is needed in front of NaNO3 to balance the equation Na2S + Zn(NO3)2 – ZnS + _NaNO3?
O 1
O 2
O 5
O 7
Answer:
A.1
Explanation:
The coefficient needed in front of NaNO₃ to balance the equation
Na₂S+ Zn(NO₃)₂---->ZnS + NaNO₃ is 2, therefore option (b) is correct.
What do you mean by the balanced chemical equation ?A balanced chemical equation is an equation that has equal numbers of atoms for each element both on the reactant and product sides.
Methods to balance the chemical equation -:
The number of atoms for a given element is calculated by multiplying its coefficient with the element’s subscript in its chemical formula.
The coefficients in front of the formulas to show how many molecules of that material are used or produced.
Hence, the coefficient needed in front of NaNO₃ to balance the equation
Na₂S+ Zn(NO₃)₂---->ZnS + NaNO₃ is 2, therefore option (b) is correct.
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gravity and magnetism are examples of what?
Answer:
hyposthesis
Explanation:
During which phase does Earth see more than half of the moon's surface? first quarter third quarter waxing gibbous waning crescent
A: Frist quarter
b: third quarter
c: waxing gibbous
d: waning crescent
Answer:
c
Explanation:
During the "Third Quarter" phase, Earth sees more than half of the moon's surface. The correct option is B.
What is Waxing Gibbous and Waning Crescent?Waxing Gibbous and Waning Crescent are two phases of the Moon.
Waxing Gibbous is a phase of the Moon that occurs after the First Quarter phase and before the Full Moon phase. During this phase, the illuminated portion of the Moon is greater than half but less than fully illuminated, meaning it appears to be a "bulging" shape. The term "waxing" means that the illuminated portion of the Moon is increasing in size.
The Waning Crescent is a phase of the Moon that occurs after the Third Quarter phase and before the New Moon phase. During this phase, the illuminated portion of the Moon is less than half and decreasing in size. The term "waning" means that the illuminated portion of the Moon is decreasing in size. The crescent shape refers to the thin sliver of illuminated portion of the Moon that is visible during this phase.
Here in this question,
During the First Quarter phase, the right half of the Moon's surface is visible from Earth.
During the Third Quarter phase, the left half of the Moon's surface is visible from Earth.
During the Waxing Gibbous phase, more than half of the Moon's surface is visible, but Earth does not see more than half.
During the Waning Crescent phase, less than half of the Moon's surface is visible, and Earth does not see more than half.
Therefore, Option B i.e third quarter is correct.
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Whats the periodic table?
Answer:
A chart that shows the elements based on atomic number, from lowest to highest.
Explanation:
Answer:
The answer will be listed below.
Explanation:
The Periodic Table is a display of 118 different chemical elements. They are arranged by their atomic numbers. The Periodic table displays the element's chemical symbol, mass, atomic number, and what group they are in.
3. How many different atoms are there in a compound?
A. one
C. two or more
B. always two
D. none of these
Answer: C
Explanation:
Help me I'm almost finished with this
Answer in 1234 statement or ABCD
Answer:
The liquid in beaker 1 has a higher density than the liquid in beaker 2.
What type of harmful bacteria did they feed the mice in the experiment?
O C. difficile
O Salmonella
Bacilli
O E. coli
Answer:
I believe the answer is C. difficile but to be honest I don't know for sure
HELP ASAP PLEASE! PLEASE
FIll in the blank
your answer will be Carbon
I just got help from a friend!
20 points (picture) thanks :) + brainliest if right
Answer:
B
Explanation:
which combination of atoms will form a molecule but not a compound?
Answer:
X and Y
Explanation:
There is no explanation
Answer:
x and w
Explanation:
What makes a triangle similar?
A :Congruent angles and not proportional sides.
B: Congruent angles and proportional sides.
C :Not congruent angles.
D :They have to be the exact
same size.
mark runs to catch a ball. Explian how the structure of muscle tissue helps him perform this function
Answer: Skeletal muscle tissue helps marks body to perform to this activity as it has such supportive structure and position in the body that he is able to do it
Explanation:
Answer:
Muscles give structure and power for any kind of movement, so the tissue needs to be flexible and tightly packed for movement. The tight bands of tissue shown in the picture allows this movement to occur.
Explanation:
answer on edmentum.
The graphs below show the change in temperature and salinity of a region of ocean as a instrument is lowered below the surface. Depth is measured in kilometers below the surface, temperature in degree Celsius, and salinity in parts per thousand.
Which prediction is most likely, based on the data?
Answers:
A) In the ocean, as salinity increases, temperature increases.
B) Organisms that require a steady salinity move freely between sea level and -0.4 km.
C) Ocean salinity decreases at depths greater than -1.8 km below the surface.
D) Organisms that require a temperature at 5 degrees C will thrive -0.6 km below the surface.
The most likely prediction based on the data is 'organisms that require a steady salinity move freely between sea level and -0.4 km' (Option B).
Salinity conditions refer to the concentration of dissolved salts in an aqueous medium.Salinity conditions may alter the physiological features of an organism, as well as its metabolic pathways (e.g., behavior, reproduction, motion).The changes in salinity can negatively alter the evolutionary fitness of an organism and its survival in particular environmental conditions (in this case, steady salinity allows organisms to move freely).In conclusion, the most likely prediction based on the data is 'organisms that require a steady salinity move freely between sea level and -0.4 km' (Option B).
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LOOK AT THE IMAGE ABOVE CAN SOMEONE PLEASE HELP ME AND SHOW FULL STEPS PLEASE
answer:
no
explanation:
cause you dumb
3. A hawk gets some help while flying by using convection
currents (air currents created by rising warm air). How is the Sun
involved in creating convectior currents?
Answer:Explanation:
Convection drives the circulation of air in the earth's atmosphere. The sun heats the air near the earth's equator, which becomes less dense and rises upward. As it rises, it cools and becomes less dense than the air around it, spreading out and descending toward the equator again.
Explanation:
Another question please help!!! :)
The answer is [Boron]
I had this answer on my Chemistry test!
The work function of a silver surface is 4.73 eV. What would happen if the silver is hit with a photon with 2.5 eV of energy?
A) One electron is released from the metal.
B) A pit forms in the metal due to the impact
C) Nothing, the photon just bounces off the surface.
D) Two electrons are released from the metal.
Answer:Nothing, the photon just bounces off the surface.
Explanation:
According to Albert Einstein, a photoelectron can only be emitted from a metal surface when the energy of the incident photon is greater than the work function of the metal.
In the scenario described in the question, the work function of the metal is greater than the energy of the photon. Hence, the photon just bounces off the metal surface without emitting any electron.
Answer:
The correct option is;
C) Nothing, the photon just bounces off the surface
Explanation:
The given parameters are;
The work function of the silver surface = 4.73 eV
The amount of energy of the photon = 2.5 eV
The kinetic energy, KE[tex]_e[/tex] of an electron when ejected from a metal surface is given as follows;
KE[tex]_e[/tex] = h·f - B·E
Where;
hf = The energy of the photon
B·E = The work function of the metal
Whereby the energy of the photon impacting on the surface of the silver is equal to or larger than the work function of the silver surface, then the energy of the photon can be reach the electrons of the silver so as to be enable the electron to be ejected through the metal surface
However, given that the energy of the photon, 2.5 eV, is less than the work function of the silver surface, 4.73 eV, the kinetic energy of an ejected electron, KE[tex]_e[/tex], is less 0, therefore, no electron will be ejected form the surface of the silver and the photon just bounces off the surface.
What classification is salt?
Answer:
Sodium chloride
Brainlist??
Electron configuration for Bohr model for sodium is
Answer: The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the remaining electron in the 3s. Therefore the sodium electron configuration will be 1s22s22p63s1.
Explanation:
Which elements likely conduct electricity well? Check all that apply.
chromium
iodine
carbon
calcium
osmium
Chromium, carbon and calcium
I did the same quiz and got a 100 (Brainliest pls)
The noble gases, or group 18, on the periodic table are known to be unreactive. Which of the following reason best describes why this family is so inert?
Their outer shells are full, they can't hold any more electrons.
Their outer shells need one electron to be full.
Their outer shells have 2 electrons.
Their outer shells have 1 electron.
Answer:
Their outer shells are full, they can't hold any more electrons.
Chemical formula for CrO
Answer:
Chromium oxide
Explanation:
Which is the amount of matter in an object?
A. weight
B. mass
C. volume
D. pounds
Answer:
c. mass
Explanation:
In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity.
Explanation:
I think the Answer is C .Thank you ☺️☺️
What tool do we use to measure volume
Answer:
Graduated cylinders, beakers, volumetric pipets, burets and volumetric flasks are five kinds of glassware often used to measure out specific volumes. Volumetric pipets, flasks and burets are the most accurate; the glassware makers calibrate these to a high level of accuracy.
Explanation:
hope this helps :)
What types of compounds are most likely to form double or triple bonds
Explanation:
ionic compounds eg sodium chloride
covalent compounds e.gmethane
An atom can be called a particle, but a molecule is never called a particle. True or False ?
Answer: False; it contains particles, but that doesn't mean it's a particle itself.
Hope this help.
The statement is false, both atoms and molecules could be referred to as particles.
An atom is defined as the smallest particle of a substance that can take part in a chemical reaction.
An atom is the smallest particle of a an elemental substance while a molecule is the smallest particle of a compound. Compounds are made up of molecules which are neutral particles.
The main difference between an atom and a molecule is that a molecule is a group of atoms held together by a chemical bond while atoms just occur individually.
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Chlorine is a very reactive non-metals. Why
Answer:
Chlorine is a very reactive non metals because this element don't form any known chemical compound.
Explanation:
Chlorine atoms have a lot of valance electrons without being complete on its own, so it has a greater need to seek it's conjugates. That's called electronegativity. Halogens are highly reactive because of their electronegativity.