Answer:
Detail is given below.
Explanation:
Each element have a specific number of valence electron. We can easily find out the number of valence electron in an atom through electronic configuration. The electrons reside in outer orbital are called valence electrons. It is also equal to the main group number of that element. Consider the example,
Sodium is present in group one thus it has 1 valence electron.
Electronic configuration of sodium:
Na₁₁ = 1s² 2s² 2p⁶ 3s¹
Let consider the example of halogens they are present in group 7A thus they have seven valence electrons.
Electronic configuration of fluorine:
F₉ = 1s² 2s² 2p⁵
The outer orbital contain seven electrons thus these are valance electron.
Copper is present in group 2B thus it must have two valence electrons.
Let check this from electronic configuration.
Cu₂₉ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹
The outer most orbital is 4s² and it has two electron thus number of valence electron in copper are 2.
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
Can somebody plz google these!!! it’s not very complicated, I just can’t find it.
Only question
WILL MARK AS CROWN)
:D
black peppered moths have higher survival rate
Explanation:
i believe black peppered moths would survive at a higer rate than white moths. black peppered moths could blend with the environment while white moths would stick out and make its self more vulnerable to predators.
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:
Which type of reaction is NaCl + AgNO3 – NaNO3 + AgCl? synthesis decomposition oxidation replacement
Answer:
Replacement
Explanation:
i took the quiz :)
Given reaction in the question is a type of replacement reaction because in that reaction sodium atom replaces the silver atom from the silver nitarte molecule.
What is replacement reaction?Replacement reactions are those reaction in which one or two atoms will replaced by another atoms.
In the given chemical reaction, sodium atom replaces the silver atom from the silver nitarte molecule as a result od which we get different products.
Decomposition reactions are those in which one compound will break down into two or more molecules.Synthesis reactions are those in which new products will formed by the combination of reactants.Oxidation reactions occur when the addition of oxygen atom and removal of hydrogen and electron takes place.Hence the given reaction is the replacement reaction.
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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.
20 points (picture) thanks :) + brainliest if right
Answer:
B
Explanation:
LOOK AT THE IMAGE ABOVE CAN SOMEONE PLEASE HELP ME AND SHOW FULL STEPS PLEASE
answer:
no
explanation:
cause you dumb
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:
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.
What classification is salt?
Answer:
Sodium chloride
Brainlist??
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.
how will you seperate dye from black ink? draw a neatly labelled same?? fast I will mark brainly 100%
Answer:
put it through a distillery
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)
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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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.
The x-axis of a velocity-time graph represents____.
Answer:
i think the answer is Y
Explanation:
Answer:
Both graphs tell you how something is changing over time. In a velocity-time graph, time is on the horizontal axis, or x-axis, and velocity is on the vertical axis, or y-axis. ... The rising line on the velocity-time graph shows where the acceler- ation is positive. The steeper the line, the greater the acceleration.
Explanation:
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.
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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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
Which properties describe elements that are nonmetal gases?
Answer:
Explanation:
Nonmetals share many similar properties including:
They are either gas (hydrogen, oxygen, nitrogen) or solid (carbon, sulfur) under standard conditions.
They are not good conductors of electricity or heat.
They are very brittle in their solid form.
They are not malleable or ductile.
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:
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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HELP ASAP PLEASE! PLEASE
FIll in the blank
your answer will be Carbon
I just got help from a friend!
The diagram shows the moon and Earth in space. Which is the best label for the dotted-line arrow?
O force of Earth's gravity
O moon's attraction to the Sun
moon's motion without gravity
O orbit of the moon around Earth
arth
Answer:
The answer is c) moon’s motion without gravity
Explanation:
I just took the quiz and I got 100 percent on Edgenuty :)
The dotted-line arrow is representing the path the moon would take if there was no force of gravity on the earth. Therefore, option (C) is correct.
What is gravity?Gravity can be explained as a force that attracts an object toward the center of the earth or any physical system that has mass. Each body with mass exerts a force or gravity on every other body with mass. Gravity is the force that keeps the moon around the earth and the planets in orbit around the sun.
In the universe, each particle with mass attracts another particle with a definite force, and that force acting is a product of the masses of those bodies.
Mathematically gravity acting between masses can be written as:
[tex]F =G\frac{q_1q_2}{r^2}[/tex]
Where F is the force, m and M are masses, G is the universal gravitational constant and r is the separation between them.
If the moon follows the dotted arrow which moves straight ahead it can be only possible if the moon's motion is without gravity.
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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.
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
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.
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 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 ☺️☺️