Hello. Can someone help me do these few questions. Thanks
Answer:
In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by chemical means. Wikipedia
How has modern research in
chemistry impacted society?
Artificial products, medicines, and fertilizers are examples of chemistry discoveries that have had the greatest impact on the modern world. Polymer discovery has resulted in all the plastics and synthetic fabrics that surround us today.
What is the importance of research in chemistry?Understanding how the properties of substances are related to their molecular structures allows chemists to design new molecules and materials with the desired properties, as well as develop or invent new types of transformations for carrying out the syntheses of these substances.
Chemistry is used in almost every aspect of today's automobiles, from the exterior paint, bumpers, and headlights to the interior seats, dashboard components, and seatbelts and airbags that protect passengers.
To name a few, industrial applications of chemistry have a direct impact on our daily lives: what we eat, what we wear, how we travel, the technology we use, how we treat illnesses, and how we get electricity. Chemistry research is constantly deepening our understanding and leading to new discoveries.
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This is an image of ice
cubes made of water. Is
water (or ice) a mixture or a
compound made up of
molecules?
А.
a mixture
В.
a compound made up of molecules
Answer:
it is a compound made up of molecules
Why is it impossible for an element to have an atomic number of 110.5? (1 point)
A_ Exactly half of the isotopes would need an atomic number of 110, and half would need an atomic number of 111, which is very unlikely.
B_ Atoms of an element all have the same whole number of protons and neutrons.
C_ Atoms with atomic numbers greater than 100 are unstable.
D_ Atoms of an element all have the same whole number of protons.
Answer:
C
Explanation:
I asked my teacher
The number of protons in an atom are always whole numbers hence it is impossible for an element to have an atomic number of 110.5. The correct answer is option D: Atoms of an element all have the same whole number of protons.
We define the atomic number as the number of protons in an atom. The number of protons in all the atoms of en element must be a whole number.
There is no half proton in the atom hence we can not have an atomic number of 110.5.
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1. Why Isn't Hess's law helpful for calculating the heat of reaction Involved in the conversion of diamond to graphite?
Answer:
This law is not applicable or not helpful in the conversion of diamond to graphite because both are just allotropes of carbon along with C60 (Buckminsterfullerene or buckyball), C540, C70, amorphous carbon, and carbon nanotube
Explanation: did that help? hope it did!
Express the following quantities in scientific notation. A. 5,453,000m B. 300.8kg C. 0.00563ng D. 0.0120325km E. 34,800s F. 332,080,000cm G. 0.0002385ms H. 0.3048mL
Answer:
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Explanation:
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The standard scientific notation is expressed as A * 10^n where:
A is an integer between 1 and 10
n is an integer
Given the value 5,453,000, expressing in standard form is expressed as:
5,453,000 = 5.453 * 10⁶ m(Note that the decimal point at the back was shifted backwards 6 times)
B) 300.8kg
In this case, the decimal point will be shifted backwards 2 times to have:
3.008 * 10² kg
C) 0.00563ng
In this case, the decimal point will be shifted to the front 3 times to have:
5.63 * 10⁻³ng
D) For 0.0120325km
In this case, the decimal point will be shifted to the front 2 times to have:
1.203 * 10⁻²km
E) For 34,800s
In this case, the decimal point will be shifted backwards 4 times to have:
3.48 * 10⁴s
F) For 332,080,000cm
In this case, the decimal point will be shifted backwards 8 times to have:
3.32 * 10⁸cm
G) For the value 0.0002385ms
In this case, the decimal point will be shifted to the front 4 times to have:
2.385 * 10⁴ms
H) For the value 0.3048mL
In this case, the decimal point will be shifted to the front 1 time to have:
3.048 * 10¹mL
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is it correct what I have done
Anss\zyew:yes,the answer is very normal and well done
You want to determine the effect of a certain fertilizer on the growth of orchids grown in a greenhouse.
Materials that are available to you include: greenhouse, 100 orchid plants, water, fertilizer, and soil. You
want to know if the orchids will hgrow best with a weak concentration of fertilizer, a medium concentration
of fertilizer, or a high concentration of fertilizer. How will you design an experiment to test different
concentrations of this fertilizer?
how do you set up a controlled experiment
A kind of scientific idea that tells you what will happen in a specific situation is a(n)
Answer:
technology scientific methods
Answer:
[tex]⚪ \: { \sf{law}}[/tex]
Iron is a type of metal that has a shiny surface. However, iron can rust easily. Explain
Answer:
Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide. ... Both oxygen and moisture are catalysts for rusting.
Answer:
Iron rusts because of of a chemical reaction known as oxidation. During the chemical reaction iron is converted to iron oxide, if it is left unaddressed, the iron oxide will spread, thereby jeopardizing the physical integrity of the iron.
Which of the following is an example of climate?
The polar regions have long winters and short, cool summers.
Humidity levels are high today.
Canada experienced an unusually warm summer this year.
Tornados formed across Oklahoma yesterday.
Answer:
"The polar regions have long winters and short, cool summers."
Explanation:
Climate is the average of that weather. The climate record also includes extreme values such as record high temperatures or record amounts of rainfall.
For Climate example:
You can expect snow in the Northeast in January or for it to be hot and humid in the Southeast in July.
Why are intensive properties useful for identifying a substance?
a
They are chemical properties.
b
They describe the amount of substance you have.
c
They are physical properties.
d
They do not depend on the amount of substance you have.
Answer:
d
They do not depend on the amount of substance you have.
Intensive properties useful for identifying a substance because they do not depend on the amount of substance you have.
WHAT ARE INTENSIVE PROPERTIES:
Intensive properties are physical properties of a substance that do not depend on the size or amount of a sample e.g. density, temperature, colour, boiling point etc. On the other hand, extensive properties are dependent on the size of a substance e. g. mass, volume, weight etc. Intensive properties of a substance do not change with respect to size, hence, they can be used in the identification of a substance.Learn more: https://brainly.com/question/3006850?referrer=searchResults
What is the equation used to calculate the density of a material?
Answer:
density = (mass) divided by (volume)
or just D = M/V
Write electronic configuration of first 30 elements in their sub shell
Answer:
Helium (He) 1s2
Lithium (Li) [He] 2s1
Beryllium (Be) [He] 2s2
Boron (B) [He] 2s2 2p1
Explanation:
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how could you use this procedure to identify
as unknown type of green ink?
Answer:
After conducting the experiment it was clear to see that the green ink used was indeed a mixture as it separated from the rubbing alcohol.
Polar molecules have partial positive and partial negative charges. An electrical
attraction between the partial positive charge of one polar molecule and the partial
negative charge of another polar molecule is called a/an
Answer:
Image result for Polar molecules have partial positive and partial negative charges. An electrical attraction between the partial positive charge of one polar molecule and the partial negative charge of another polar molecule is called a/an
A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other.
Explanation:
Arrange the gases in increasing order of the number of atoms that make up its molecule, from left to right.
Cl₂-CH₄-SO₂-CH₂O-C₂H₄.
thank you!
Answer:
C₂H₄-CH₄-CH₂O-SO₂-Cl₂
Explanation:
The arrangement of gases in increasing order of the number of atoms that make up its molecule, from left to right, is C₂H₄-CH₄-CH₂O-SO₂-Cl₂.
What are gases?
Gas is one of the matters. It's invisible, and its particles are present very far away from each other. The atoms of the gas move randomly, and they are always in motion.
There are iii kinds of matter, solid, liquid, and gas. When there is a modification in temperature when there is a rise in temperature the solid becomes liquid and eventually, the liquid becomes gas.
The arrangement of gases in it increases the order of the number of atoms. So it can be identified by seeing the moles of elements that are shown in the chemical formula of gas.
Thus, the arrangement of gases is C₂H₄-CH₄-CH₂O-SO₂-Cl₂.
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How many moles are there in 4.6g of sodium
Answer:
0.20moles
Explanation:
1 mole Na contains 23 g Na
23 g Na =1 mole of Na
1 g Na= 1/23 moles of Na
4.6 g Na= 1/23×4.6= 4.6/23=0.2 moles
Therefore 0.2 moles are present in 4.6 g of Na
Answer:
the 4.6g sodium has 0.2 moles
A piece of metal has a volume of 30.0 cm and a mass of 252 g . What is its density?
What metal do you think this is?
density = mass/volume
252/30 = 8.4 g/cm3
The metal is likely to be Nichrome
What is Density?
The Density of a material is the mass per unit volume
say the mass is m kg
and the volume is v cm^3
Then the density is
Density = mass/volume
Given data
Mass = 252g gram
volume = 30 cm^3
Hence the density can be calculated as
Density = 252/30
Density = 8.4 g/cm^3
From the value, this corresponds to the density of Brass
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define mitochondria.
Answer:
An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner part being folded inwards to form layers (cristae).
Explanation:
Which statements describe density? Check all that apply.
Density is a chemical property of an object.
The density of an object is constant.
Density is a derived unit of measure.
Density is the sum of the mass and volume of an object.
The density of an object determines whether it will sink or float.
( pick multiple)
Answer:
density is the sum of the mass and volume of an object
Could someone plz help me
Answer:
A
Explanation:
B: not B. Opinions don't matter. Facts do.
C: its a consideration. It will limit the scope of the experiment. But it's not relevant to the investigation. Not C
D: You might want to contact some scientists to see what they think about your investigation, but randomly interviewing anyone and everyone is not the answer.
You want to do A for certain.
List nonscientific careers that use chemistry.
Non scientific careers are the careers that do not involve a person studying science courses or pursuing fields related to sciences.
Some of the nonscientific careers that use chemistry include:
Astrophysicist: An individual who studies the universe and its contents, such as the planets, stars etc. ProfessorSales: Those in the sales department may be involved in the use of chemicals.LawyerChefFarmer: A farmer can make use of chemicals such as herbicides, pesticides etc in controlling herbs and pests in his farm.Technical Writer: A writer may need to study and learn about a chemical or make use of it for his writing purpose.Read related link on:
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An element has an atomic number of 16. An ion of this element has a 2- charge. How is the ion formed?
Answer: Atomic number 16 is sulfur (S). It has 6 valence electrons and needs two more to complete it's outer shell to 8 electrons. It will steal those electrons from elements theat need to lose electrons to achieve a full valence shell (lower energy shell).
Explanation: Sulfur's valence shell is 3s^2_3p^4. It needs two more electrons to fill the 3p orbital to 6 electrons. This is a lower energy state and so sulfur will remove, or share, electrrons from elements that benefit from losing an electron to achieve a lower energy state.
71. The density of osmium (the densest metal) is 22.57 g/cm². If a
1.00-kg rectangular block of osmium has two dimensions of
4.00 cm x 4.00 cm, calculate the third dimension of the block.
Answer:
y = 2.77 cm
Answer: The third dimension is 2.77 cm
A hydrogen electron is elevated from level 1 to level 2. Another electron is elevated from level 2 to level
4. The transition requiring the greatest energy change is
DONE
Intro
Answer
level 2 to 4
Explanation:
i guessed cause im just that cool
Can someone PLEASE help me with this im struggling bad
Answer:
4.5+2.34= 6.844.5-5 =-0.56.00+3.411= 9.4113.4×2.32 = 7.8887.77/2.3= 3.377. 1200×23.4=28080
9. = 78.512
10. =341.199
11= 7.45
12 =65.0023
13.=3400210.34
Explanation:
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11. What is the mass of the object in the picture below? The density is 0.789g/mL.
Hint: You will need to find the volume first!
Answer: 3.156 grams
Explanation: The additional volume is 4 ml. (0.789 g/ml)*(4 ml) = 3.156 grams
Balance the following chemical equation and explain how u got it
a. Fe + O2 →Fe2O3
b. FeBr3 + H2SO4 → Fe2(SO4)3 + HBr
c. C4H6O3 + H2O → C2H4O2
Explanation:
just trying...hope that helps
6. When conducting experiments, scientists use
to help guide their processes.
When conducting research, scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis (often in the form of an if/then statement), the results aiming to support or contradict a theory.
Hope this helps you!
