The column number of an element in the periodic table is generally determined on the basis of the number of valence electrons. The elements in the same column have similar chemical properties.
What are valence electrons?The electrons present in the outermost shell of an atom which take part in chemical reactions are called the valence electrons. These electrons are responsible for the interaction between the atoms and the formation of chemical bonds.
The valence electrons of an atom also gives us an idea about the chemical properties of elements like valency, the number of unpaired electrons present, etc. The column number of an element is mainly determined on the basis of number of valence electrons.
The elements are placed in vertical columns in the periodic table. There are 2 electrons in the outermost shell of Alkaline earth metals. So they belong to second column.
Thus it is the valence electron which determines the column number.
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Is copper penny react
reaction with Nitric
acid a
Chemical or physical
Change?
Answer:
The reaction that occurs is a redox reaction. The Copper metal (Cu 0)on the copper pennies is oxidized in concentrated nitric acid to produce Cu2+ ions. Copper is easily oxidized to Cu2+, which is blue in aqueous solutions (water) so you should see the solution turn blue as the copper penny reacts.
Have a nice day ;)(^-^)
Taking into account the definition of chemical and physical change, the reaction of the copper penny with nitric acid is a chemical change.
Physical changePhysical changes are those in which the substances involved are the same before and after the change. That is, a physical change is a transformation in which the nature of matter does not change.
Chemical changeChemical changes are considered to be those in which the substances involved are transformed into totally different ones.
In this way, the initial substances do not exist after the phenomenon has occurred and instead, new substances are formed, different from the initial ones.
That is, a chemical change is a transformation in which the nature of matter varies.
This caseWhen a penny of copper reacts with nitric acid, a redox reaction occurs where the copper metal in the copper pennies is oxidized to produce Cu²⁺ ions, whereas because the nitric acid oxidizes the copper, the nitric acid itself is reduced to nitric oxide (NO). Nitric oxide then reacts with oxygen in the air to produce nitrogen dioxide (NO₂). This can be represented by:
Cu + 4 HNO₃ → Cu²⁺(ac) + 2 NO₃⁻ + 2 NO₂ + 2 H₂O
Finally, the reaction of the copper penny with nitric acid is a chemical change because a redox reaction occurs.
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When an iron nail is ground into powder, its mass ____.
a. stays the same
b. decreases
c. increases
d. cannot be determined
When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
a. a physical change
b. a chemical change
c. neither a physical change nor a chemical change
d. both a physical change and a chemical change
Answer:
1.It stays the same
Explanation:
because its only the natural stature of it has changed
Which of the following example(s) from everyday life are made possible by modern chemistry?
If you could help me out I would really appreciate it. Thank you!
Answer:
I believe it is c
Explanation:
........................
From everyday life the following have been made possible by modern chemistry:
b. wearing a synthetic spandex athletic shirt
c. taking a pill to get relief from a cold
d. getting a boost of energy by eating an apple
Modern chemistry is a branch of chemistry that deals with the identification of structure, composition, physical as well as chemical properties of the substances that can help modern day humans to deal with their day to day problems like poor health, meeting energy requirements and others. Spandex is a material that has a chemical nature of absorbing the sweat from the body of athlete so this can be a part of modern chemistry. The chemical formulation of pill will help in fighting with the cold causing infecting agent in the body so it will help in overcoming the ill effects of cold thus helping mankind, so it is the part of modern chemistry. Apple is a source of sugar when it is metabolically broken in the body it releases energy which can be utilized by the body as a source of energy so it is a part of modern chemistry. Observing the sky at night during campaign is a physical phenomena.Hence, use of spandex in athletics shirt, pill for overcoming cold and apple as source of energy are parts of modern chemistry.
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What characteristic of an epic hero does this passage
show?
the ability to embark on a long journey
the ability to receive help from a supernatural force
the ability to speak with confidence
The ability to speak with confidence shows the characteristic of an epic hero does this passage show. Option C is correct.
What is confidence?
The feeling or emotion or belief that one or a person can have faith in or trust on someone or for something that he or she is doing or about to do and the hero are the inspiration for the society.
In other words a feeling or emotion of self-assurance or self believe arising or rises from an appreciation or motivation of one's own abilities or qualities or performance.
Therefore, ability to speak with confidence shows the characteristic of an epic hero does this passage show. Option C is correct.
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Answer:
B
Explanation:
Cuz
help me slove this question
which places have more kinetic energy than potential energy
Answer:
usually at a higher place or height as in at the highest point on a roller coaster.
Explanation:
A student is measuring the volumes of nectar produced by a flowering plant for an experiment. He measures nectar from 50 flowers using a graduated cylinder that measures to the nearest millilitre (mL). Which statement describes a change that can help improve the results of his experiment?
A.) His measurements will be more precise if he takes measurements from an additional 100 flowers. B.) His measurements will be more accurate if he uses a graduated cylinder that measures to the nearest tenth of a mL. C.) His measurements will be more precise if he uses a graduated cylinder that measures to the nearest tenth of a mL. D.) His measurements will be more accurate if he takes measurements from an additional 100 flowers.
NEED HELP NOW PLEASE!!!
Answer:
His measurements will be more precise if he uses a graduated cylinder that measures to the nearest tenth of a mL.
Explanation:
His measurements will be more accurate if he uses a graduated cylinder that measures to the nearest tenth of a mL. The correct option is B.
The closeness of a measurement to the real or recognised value is referred to as accuracy.
The learner can achieve more exact measurements and eliminate the possibility of rounding mistakes by using a graduated cylinder that measures to the closest tenth of a millilitre.
This enhanced precision will help to improve measurement accuracy. Taking measurements from more flowers (options A and D) will expand the sample size but will not enhance accuracy unless the measuring device is updated.
Option C recommends improving precision but does not address accuracy.
Thus, the correct option is B.
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А
B
с
578 g
343 9
722 g
which is more dense?
Answer:
can you rephrase the question it is hard to understand
If 5.0 g of copper cools from 35.0oC to 22.6 oC and loses 23.6 J of heat, what is the specific heat of copper? a. 0.038 J/(g. oC) b. 0.62 J/(g. oC) c. 0.076 J/(g. oC) d. 0.38 J/(g. oC)
Answer:
c = 0.38 J/(g-°C)
Explanation:
Given that,
Mass of copper, m = 5 g
Initial temperature, [tex]T_i=35^{\circ} C[/tex]
Final temperature, [tex]T_f=22.6^{\circ} C[/tex]
When copper cools, it looses 23.6 J of heat. We need to find the specific heat of copper. The heat lost is given by :
[tex]Q=mc\Delta T[/tex]
c is specific heat
[tex]c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{23.6}{5\times (22.6-35)}\\\\c=0.38\ J/g-^{\circ} C[/tex]
Hence, the correct option is d.
Which atom has a configuration that ends in 5s 2?
Answer: Zirconium [Kr]4d :)
Explanation:
I need help with problems 11-13 please. I’m very confused on how to find Volume when there’s no specific shapes and numbers.
Answer:
To find volume you can either look at the displacement of the water or Length•Width•Height
Explanation:
11) 12
12) 340 mL
13) 196 m\
Question 4 (4 points)
(01.06 LC)
Water is an example of a mixture because it is made up of hydrogen and oxygen atoms bonded together. (4 points)
O True
O False
Answer:
False
Explanation:
The mixture is defined as a chemical substance formed by the combination of two or more substance but do not form any bond together.
Water is not a mixture because the water molecule is consists of two hydrogen (H2) atoms and one oxygen (O) atom bonded together with hydrogen bonds.
Hence, the given statement is "false".
what does the chemical formula Ba(HCO3)2 tell us about number of atoms of each element present
Answer: The chemical formula is Ch(HCO3)2 and Cn(HO3)2
Explanation:
There is 1 atom of Ba, 2 atoms of hydrogen, 2 atoms of carbon, and 6 atoms of oxygen.
What are molecules?The smallest particle of a substance has all of the physical and chemical properties of that substance.
The chemical formula Ba(HCO3)2 tells us about the number of atoms of each element present as follows:
1 atom of Ba
2 atoms of hydrogen
2 atoms of carbon
6 atoms of oxygen.
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trial 2, 2.68 g/cm/3 trial 3, 2.84g/cm/3. aluminum has a density of 2.70g/cm/3 calcute the percent error for each trial.
Answer:
trial 2: 0.74
trial 3: 5.19
I think but the equation for sloving percent error is:
(true value - determined value)/true value * 100
Explanation:
what happens during covalent bonding?
Answer:
The atoms share some of their outer electrons so that each atom has a stable noble gas arrangement.
Explanation:
Where light is hitting an object
The phrase "where light is hitting an object" refers to the specific points or areas on the surface of an object that are directly exposed to light.
These are the regions where photons from a light source directly interact with the object's surface.
When light hits an object, it can be absorbed, reflected, or transmitted depending on the object's properties. The areas where light is hitting will typically appear brighter or illuminated, while the areas in shadow or not directly exposed to light will appear darker.
The distribution of light hitting an object plays a crucial role in determining its visibility, color, and overall appearance.
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What is the specific heat of a substance that absorbs 228 joules of heat when a sample of 706 g of the substance increases in tempature from 26.0 c to 88.8 c
Answer:
[tex]c=5.14\ J/kg ^{\circ} C[/tex]
Explanation:
Given that,
Heat absorbed by a sample, Q = 228 J
Mass of a sample, m = 706 g = 0.706 kg
Initial temperature is 26 °C and final temperature is 88.8°C
We need to find the heat absorbed by the sample. The heat absorbed by an object is given by :
[tex]Q=mc\Delta T\\\\\text{Where c is specific heat of sample}\\\\c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{228\ J}{0.706\ kg(88.8-26)^{\circ} C}\\\\c=5.14\ J/kg ^{\circ} C[/tex]
So, the specific heat of the sample is [tex]5.14\ J/kg ^{\circ} C[/tex].
1.
What is the chemical symbol for silver?
Answer:
Explanation:
Ag
If a substance has a mass of 12.50 g and takes up 3.4 mL of space, what is the density?
Answer:
The answer is
3.68 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} [/tex]From the question
mass of substance = 12.50 g
volume = 3.4 mL
The density of the substance is
[tex]density = \frac{12.50}{3.4} \\ = 3.676470588...[/tex]
We have the final answer as
3.68 g/mLHope this helps you
which branch of science studies non-living things?
Answer: The branch of science you are referring to is Physical Science.
Answer:
physical science
Explanation:
Physical science is a branch of natural science that studies non-living systems, in contrast to life science.
Consider a sealed glass bottle. If the bottle is thrown into a fire, what will happen to the bottle and why? Which law is the best explanation?
Answer:
Charles' Law
Explanation:
If a sealed container of gas were placed in a fire, the temperature and pressure of the gas would increase until the container broke or exploded. ... to volume when temperature is constant.
In the case when the bottle should be thrown into the fire so here Charles' Law should be applied.
What is Charles' Law?Charles's law is a statement where the volume should be occupied by a fixed amount of gas that should be directly proportional to its absolute temperature in the case when the pressure remains constant.
Since in the case when the sealed container of gas should be placed in the fire so here the temperature and the pressure should be increased till the break of the container.
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You have 150 g of water (m). The specific heat of the water is 4.184 g/jC (c) . You heat the water and raise the temperature by 1 degree. How much heat did the water absorb?
Answer:
627.6J
Explanation:
q=mcΔT
where:
q = heat energy (J)
m = mass (g)
c = specific heat (g/j*C)
Δt = change in temperature (C/K)
q= (150)(4.184)(1) = 627.6
Calculate the number of moles for 12.044*10^23 number of helium atoms
Answer:
Explanation:
number of moles=number of particle (atoms)/avogadro number (NA)
we know that avogadro number is equal to 6.23*10^23
given number of atoms=12.044*10^23
therefore
moles=12.044*10^23/6.23*10^23=1.9=2
Plsss helpppp pls fast :(
Answer:
valance electrons are located in the outermost shell/ outermost energy levels. it determines how they will react their reactivity.
CONCLUS Your conclusion will include a summary of the lab results and an interpretalion of the results. Please answer al questions in complele sentences using your own words Using two to three sentences, summarize what you investigated and observed in this lab What I observed in this lab was what materials to use for different things. I also learned how to make things sturdier. 2 What building malerial did you use to build your house? My house is made.autof brick and/or clay brick and wood. 3 Did your results support or fail to support your hypotheses? Type Here IN 4 What were the densities of the malerials you chose for the was ond floor for the home in Thy Worlar Type Here Why do you think a building material's density is important when building homes or architectural structures? Type Here Why wouldn't you choose wood or aluminium for the lalches on your house? Type Here Help Improve Office Notes
Answer:
Here’s the answer
Explanation:
Which of the following is an example of an intensive physical property?
a. boiling point
b. height
c. volume
d. none of the above is an example of intensive properties
e. all of the above are examples of intensive properties
Answer:
boiling point is an intensive property because it stays the same no matter the amount of an element or molecule
Explanation:
(01.04 MC)
Describe two distinct ways in which the skin could help cool the body on a hot day. (5 points
what is the name of that equipment she is using
Answer:
picture?
Explanation:
Wood has a density of 0.531 g/cm3. What is the volume of 44 grams of wood?
Answer:
The answer is 82.86 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass of wood = 44 g
density = 0.531 g/cm³
It's volume is
[tex]volume = \frac{44}{0.531} \\ = 82.86252354...[/tex]
We have the final answer as
82.86 cm³Hope this helps you
what happened to the color of the sand when it goes through filtration and is quantitative or qualitative
Answer:
Qualitative
Explanation:
I'm not sure if there was another part to the question, but if you are looking at the color of the sand, that is a qualitative observation.
Quantitative statements involve numbers. (Ex: The house has 4 bedrooms.) Qualitative statements describe characteristics. (Ex: The house is blue.)Which mineral is found in almost every type of rock?
Answer:
Olivine
Explanation:
Hope this helps! :) x