Which gas contains the same number of molecules as 9g of water?
A) 2g of hydrogen
B) 14g of nitrogen
C) 32g of oxygen
D) 44g of carbon dioxide
Answer:
B) 14g of nitrogen
Explanation:
To calculate number of molecules in 9g of water, we first convert mass to mole by using mole = mass/molar mass i.e.
mole = 9g/18g/mol of water
mole = 0.5mol
Next, we multiply by 6.022 × 10^23 molecules to get 3.011 × 10^23 molecules in 9g of water (H2O).
- For hydrogen gas: Molar Mass = 2g/mol, mass = 2g
mole = 2/2 = 1
No. of molecules = 1 × 6.022 × 10^23 = 6.022 × 10^23 molecules.
- For Nitrogen gas: Molar Mass = 28g/mol, mass = 14g
mole = 14/28 = 0.5mol
No. of molecules = 0.5 × 6.022 × 10^23 = 3.011 × 10^23 molecules.
- For Oxygen gas: Molar Mass = 32g/mol, mass = 32g
mole = 32/32 = 1mol
No. of molecules = 1 × 6.022 × 10^23 = 6.022 × 10^23 molecules.
- For carbondioxide gas: Molar Mass = 44g/mol, mass = 44g
mole = 44/44 = 1mol
No. of molecules = 1 × 6.022 × 10^23 = 6.022 × 10^23 molecules.
Based on he results of each calculation, NITROGEN contains the same number of molecules as 9g of water
What is the chemical formula for the name lithium fluoride?
Answer: Lithium fluoride is an inorganic compound with the chemical formula LiF.
Answer:
The chemical formula for lithium fluoride is LiF. I hope this helps
(11) su pilate
The substance which is most suitable for drying ammonia is
Answer:mark as brainliest
Explanation:H2SO4 and anhydrous calcium chloride CaCl2 are not used to dry ammonia because they react with it. The gas is passed through fresh quicklime (solid calcium oxide lumps) to effectively dry it.
A book is sitting on a desk. The area of contact between the book and the desk is 0.06 m2 of the body's weight is 30 N what is the pressure the book exerts on the desk
Answer:
500N/m²
Explanation:
The Pressure can be calculated using the formula:
P = F/A
Where;
F = force (N)
A = Area (m²)
Based on the information provided in the question, F = 30N, A = 0.06m²
P = F/A
P = 30/0.06
P = 500N/m²
Which of the following statements is true?
A. Cations are always larger than the atoms from which they form.
B. Cations are always the same size as the atoms from which they form.
C. Anions are always larger than the atoms from which they form.
D. Anions are always smaller than the atoms from which they form.
Answer:
B. Cations are always the same size as the atoms from which they form.
Explanation:
That's i read in the book
"Anions are larger in size than the atoms from which they form" is a true statement. Therefore, option (C) is correct.
What are anions and cations?A cation contains more protons than electrons in it, which give it a net positive charge. A cation can be formed by losing one or more electrons must be lost by atoms.
The charge on the ion will be equal to the number of electrons lost as indicated after the chemical symbol. For example, silver (Ag) has lost one electron to become Ag⁺. The size of the cation is always smaller than the atom from which it formed.
An anion contains more electrons than protons which gives it a net negative charge. An anion can be formed by gaining one or more electrons or typically pulled away from other atoms.
The charge of the anion will be equal to the number of electrons gained, which is indicated after the chemical symbol. For example, chlorine (Cl) accepts one electron to become Cl⁻.
The size of an anion is greater than the atoms from which it formed as the number of electrons in the ion increases and effective nuclear charge decreases.
Learn more about anions and cations, here:
https://brainly.com/question/20435320
#SPJ2
Arrange the following atoms in order of increasing ionization energy: lithium, oxygen, magnesium, strontium, chlorine, and tellurium. Explain your order.
Answer: lithium < strontium < magnesium < tellurium < chlorine < oxygen
Explanation:
Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.
In a period, the ionization energy increases as we move across a period as the size decreases. The electrons get added to the same shell and the nuclear charge increases.The valence shell moves nearer to the nucleus. Thus more energy is required to remove the valence electron.
In a group , the ionization energy decreases from top to bottom as we move down a group. The size increases as the electrons get added up in the new shell, the electron in the outermost orbital gets far away from the nucleus. And hence, the electron will be easier to remove. Thus, lesser energy is required to remove the valence electron.
The correct order of increasing ionization energy will be:
lithium < strontium < magnesium < tellurium < chlorine < oxygen
Ionization energy is the energy required to remove the most loosely bound electron from the last shell.
In the periodic table, there are groups and periods.
Group represents the vertical column.The period represents the horizontal rows.In a period, the ionization energy increases as we move across a period as the size decreases. The electrons get added to the same shell and the nuclear charge increases.
The valence shell moves nearer to the nucleus. Thus more energy is required to remove the valence electron.
In a group, the ionization energy decreases from top to bottom as we move down a group.
The size increases as the electrons get added up in the new shell, the electron in the outermost orbital gets far away from the nucleus. And hence, the electron will be easier to remove. Thus, lesser energy is required to remove the valence electron.
The correct order of increasing ionization energy is:
lithium < strontium < magnesium < tellurium < chlorine < oxygen
For more information, refer to the link:-
https://brainly.com/question/1602374
In the redox reaction AgNO3 + Na → NaNO3 + Ag, which element has been
oxidized?
Answer:
sodium I think .............
Which type of weathering has the greatest impact in areas with warm climates and lots of rainfall?
Answer:
In general, hot wet climates accelerate chemical weathering while cold dry climates accelerate physical weathering. Although the rate of weathering depends on the type of rock, rocks in tropical climates experience the highest rates of weathering because of the combination of high heat and heavy rainfall.
Study the image.
A world map showing the Principal World Air Masses. The four major types of air masses are noted on the map.
Which air mass has formed immediately north of Antarctica in the image?
Answer:
a
Explanation:
A world map showing the Principal World Air Masses. The four major types of air masses are noted on the map. The maritime polar has formed immediately north of Antarctica in the image.
Where is the maritime polar formed?The north Pacific Ocean produces the majority of the maritime polar air masses that affect the United States. However, maritime polar air occasionally forms in the North Atlantic Ocean and moves into the New England states.
In the winter, for example, an arctic air mass can move over the ocean, picking up some warmth and moisture from the warmer ocean and transforming into a maritime polar air mass (mP), which is still fairly cold but contains moisture.
In the image, the maritime polar has formed immediately north of Antarctica. The temperature of mP air varies between just above freezing and below 70 degrees Fahrenheit. As it moves over elevated terrain, mP air changes. Mountain ranges on the windward side
Thus, The maritime polar has formed immediately north of Antarctica in the image.
To learn more about the maritime polar, follow the link;
https://brainly.com/question/7423218
#SPJ6
Find the mass, in grams, of 7.50×1024 formula units of aluminum oxide.
How many valence electrons are found in atoms of group 14?
Answer:
4 valence electrons.
Explanation:
The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance lose energy during a change of state. Before the change, the atoms are close together but are able to slide past one another.Which arrow represents the change of state described above?
M
N
P
Q
Answer:
D. P
Hope it works!
Explanation:
Wasim and his friends want to test if the solution of a substance is acidic or not. These are the tests that each of them performed. Wasim: Dipped the blue litmus in the solution Akram: Dipped the red litmus in the solution Neha: Dipped both the blue and the red litmus in the solution one after other. Who among them performed a proper test ?
Answer:
Wasim and Nehra did the Proper testing
Explanation:
In acidic condition Blue litmus turns red
In basic condition Red litmus turns Blue
In order to test an Acidic solution we need Blue litmus.
Wasim Dipped the blue litmus in the solution : it will turn red and shows acid
Akram Dipped the red litmus in the solution : No it will not show, it's a test for base
Neha: Dipped both the blue and the red litmus in the solution one after other.
Blue litmus will turn red which will show Acidic nature, after that Adding Red litmus in it will not show any change as Red litmus only changes in Basic condition.
Therefore, Wasim and Nehra did the Proper testing
IMMA WAIT FOR MY BABY EVEN IF IT TAKES ALL NIGHT !!!!!!
Answer:
um okay lol
Explanation:
Answer:
Oh ok
Explanation:
Also can u pls mark me brainliest im new pls
Which of the following are chemical or nuclear reactions?
1. chemical plant explosion
2. Tsar Bomba
3. meteor strike
4. Tunguska Event
5. Super Volcano eruption
6. fusion powering the sun
Answer:5) super Volcano eruption
Explanation:
Answer:
#1, #2, #4, and #6 are the answers.
Explanation:
#2, #4, and #6 have something to do with radioactivity which is mostly categorized in nuclear reactions, #3 and #5 are partly categorized in thermal reactions while a chemical plant explosion is almost categorized as a chemical bomb; Chemical explosions may be either decomposition or combination reactions. Decomposition reactions occur in materials such as trinitrotoluene (TNT) and nitroglycerine. Combination reactions require that two or more components react together exothermically to produce hot gases. Some examples are ammonium nitrate and fuel oil (ANFO), and gunpowder (potassium nitrate, carbon, and sulfur). In conclusion, #1, #2, #4 and #6 are the answers.
2. If 300.0 mL of a 2.5 M solution of nitric acid is added to 500.0 mL of water, what is the molarity of the
dilute solution?
Answer:To calculate the Molarity of a 70 wt. % Nitric Acid the number of moles of HNO 3 present in 1 liter of acid needs to be calculated. Knowing the density of the acid to be 1.413 g/mL, we can calculate the weight of 1 L of 70% HNO 3 to be 1413
Explanation:
SIMPLE ANSWERS ONLY I ALREADY GOOGLED AND DIDN'T FIND ANYTHING PLEASE ANSWER IN YOUR OWN WORDS.
How is atomic mass calculated for elements on the periodic table.
Explanation:
The atomic mass of elements on the periodic table are derived from the proportion of the geonormal abundance of the different isotopes of an element.
Using a mass spectrometer, the proportion/percentage/fraction by which each of the isotopes of an element occurs in nature is determined. This proportion is the geonormal abundance. From this the atomic mass of the element can be derived. Simply multiply the mass by the abundance and sum the values for the same isotopes together.A solution containing 15.2 g of BaBr2 is reacted with a solution containing excess Na3PO4 to form 9.50 g of precipitate. What is the percent yield of the reaction?
Answer:
Explanation:
3BaBr₂ + 2Na₃PO₄ = 6BaBr + Ba₃(PO₄)₂ (s)
3 x 297 = 891 gm 1 x 602 = 602 gm
891 gram of BaBr₂ yields 602 gram of precipitate
15.2 gram of BaBr₂ yields 602 x 15.2 / 891 gram of precipitate
= 10.23 gram
actual yield = 9.5 gram
percent yield = 9.5 x 100 / 10.23
= 92.86 % .
65 POINTS AND BRAINLIEST PLEASE HELP ASAP
For this assignment, you will write a research essay, or create a presentation, about a scientist who contributed knowledge to the field of chemistry. Your essay, or presentation, should include the following information about your scientist:
Describe your scientist's contributions and innovations to his or her field.
How did your scientist's research and data influence future use of his or her findings?
Describe the background, interests, or goals that affected your scientist's observations and conclusions.
Once you have selected a scientist, you will need to locate at least three different reliable resources to use to conduct your research. You may use textbooks, the Internet, or library books. These resources should be cited within your presentation and should be listed in a bibliography that you submit with your essay, or slide presentation. Use the Citations, Essay Writing, and Finding Reliable Resources tutorials to guide your writing.
If you have another method by which you would like to present your research findings, please have it approved by your instructor before you begin writing. No matter what presentation style you choose, be sure to use complete sentences and paragraphs, and include all of the necessary research required. You should also review the grading rubric before you begin. Select one of the following scientists, or pick another scientist of interest with your instructor's permission, to conduct your research on: Rosalind Franklin
Answer:
Rosalind Elsie Franklin (25 July 1920 – 16 April 1958)was a British biophysicist and X-ray crystallographer who made critical contributions to the understanding of the fine molecular structures of DNA, RNA, viruses, coal and graphite. The DNA work achieved the most fame because DNA (deoxyribonucleic acid) plays essential roles in cell metabolism and genetics, and the discovery of its structure helped scientists understand how genetic information is passed from parents to children.
rosalindfranklin
Franklin is best known for her work on the X-ray diffraction images of DNA which led to discovery of DNA double helix. Her data, according to Francis Crick, was "the data we actually used" to formulate Crick and Watson's 1953 hypothesis regarding the structure of DNA.Franklin's X-ray diffraction image confirming the helical structure of DNA were shown to Watson without her approval or knowledge. Though this image and her accurate interpretation of the data provided valuable insight into the DNA structure, Franklin's scientific contributions to the discovery of the double helix are often overlooked. Unpublished drafts of her papers (written just as she was arranging to leave King's College London) show that she had independently determined the overall B-form of the DNA helix and the location of the phosphate groups on the outside of the structure. However, her work was published third, in the series of three DNA Nature articles, led by the paper of Watson and Crick which only hinted at her contribution to their hypothesis.
After finishing her portion of the DNA work, Franklin led pioneering work on the tobacco mosaic and polio viruses. She died in 1958 at the age of 37 from complications arising from ovarian cancer.
can someone solve c and d?
Answer:
Na + + e - → Na.
Pb 2+ + 2e - → Pb.
2H + + 2e - → H 2
Explanation:
Ice sheets once covered the upper northeastern portion of the United States.
True or False?
Answer:
I do believe the answer is false.
Hope This Helps!!
Any 1 help with Chemistry here??
A chef fills a 60-ml container with 45.3 g of cooking oil. What is the density of the oil?
Answer:
0.76 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{45.3}{60} \\ = 0.755[/tex]
We have the final answer as
0.76 g/mLHope this helps you
Options are:
1. 4
2. 8
3. 2
4. 1
Answer:
1. 4
Explanation:
there are four atoms of hydrogen. you can tell because there is a 4 after the H.
1. The speed limit on most city streets is (25 miles). How many meters per minute
hour
is this?
This is a conversion.
Answer:
[tex]Speed = 670.56 \frac{m}{min}[/tex]
Explanation:
Given
[tex]Speed = \frac{25 mi}{hr}[/tex]
Required
Convert to meters per minutes
[tex]Speed = \frac{25 mi}{hr}[/tex]
Start by converting the speed from miles to meters
[tex]1\ mile = 1609.34\ meters.[/tex]
So, we have:
[tex]Speed = \frac{25 * 1609.34\ m}{hr}[/tex]
[tex]Speed = \frac{40233.5\ m}{hr}[/tex]
Next, we convert time from hours to minutes
[tex]1\ hour = 60\ minutes[/tex]
So, we have:
[tex]Speed = \frac{40233.5\ m}{60\ min}[/tex]
[tex]Speed = 670.56 \frac{m}{min}[/tex]
Hence, the equivalent of 25 miles per hour is 670.56 meters per minutes
Which is bigger an atom or a cell?
Answer:
Both are small
Explanation:
Atom comprises to die molecules, and cell comprise to for tissues
I don’t really have a question... and my teacher says I need to give one related to this reading above :/
Can somebody plz give one that makes sense (WILL MARK BRAINLIEST)
Answer:
Just say I wonder why teachers give homework :/
Explanation:
Why don't we use the plutonium (Pu) from reprocessed/used nuclear fuel? There are 2 correct answers. (this is for my earth science, it's an edpuzzel)
Answer:
Erosion, and soil damage
Explanation:
We do not use the plutonium (Pu) from reprocessed / used nuclear fuel because Plutonium has high rate of spontaneous fission and Uranium is the main fuel which is used for nuclear reactor.
What is Nuclear reactor ?A nuclear reactor is a device which is used to initiate and control a chain reaction to release large amount of steady heat there by produces energy.
Thus from above conclusion we can say that We do not use the plutonium (Pu) from reprocessed / used nuclear fuel because (i) Plutonium has high rate of spontaneous fission and (ii) Uranium is the main fuel which is used for nuclear reactor.
Learn more about the Nuclear reactor here: https://brainly.com/question/23160065
#SPJ2
Express in scientific notation. Choose the answer with the proper number of significant figures.
9x109
4.5 x 10
Answer:
4.5 times 10 = 45
Explanation:
"Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant."
Match the definitions on the left with the terms on the right.
Answer:what defino? I don’t see nun
Explanation:
Answer:
answer in picture
Explanation: