Which equation is balanced?
Mg3N2 + H2O 3MgO + 2NH3
C3H8 + 5O2 H2O + 3CO2
Zn + 2HCl ZnCl2 + H2
3H2SO4 + 2Fe Fe2(SO4)3 + H2
Answer:
it's the third one
Explanation:
in the first one oxygen molecules aren't balanced
the second ok me oxygen isnt balanced
and the fourth one hydrogen isn't balanced
hope it helps ;)
A balanced equation is a representation in which the coefficients of the individual atoms of a molecule or compound are the same on both the left and right of the equation.
The correct answer is:
Option C. Zn + 2 HCl --------> ZnCl₂ + H₂
This can be explained as:
In the first equation, the number of H and O atoms are not balanced.In the second case, the atoms of hydrogen and oxygen are not the same on the sides of the equation.In the third reaction between zinc and hydrochloric acid, all the atoms of the reaction are balanced.In the fourth reaction, the hydrogen atoms are not balanced.Therefore zinc and hydrochloric acid reaction are balanced.
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How does an atom become charged?
-How does an atom get a positive charge?
-How does an atom get a negative charge?
-Can an atom get a charge with a change of particles in
the nucleus? Explain, please.
Answer:
An atom becomes charged when there is an unequal amount of positive and negative particles in the nucleus.
An atom gets a positive charge when there is an increase in protons or a decrease in electrons, such that there are more protons than electrons in the nucleus.
An atom gets a negative charge when there is an increase in electrons or a decrease in protons, such that there are more electrons than protons in the nucleus.
An atom can get a charge with a change of particles in the nucleus if that change results in an uneven number of protons and electrons.
Explanation:
Because protons are positively charged particles and electrons are negatively charged particles, a neutral atom has an equal amount of protons and electrons, so that the opposite charges of the particles cancel each other out.
However, if there is an unequal amount of protons or electrons in the nucleus, the charge of the particles will no longer be canceled out, and the atom as a whole will take on a positive or negative charge.
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.
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In the redox reaction AgNO3 + Na → NaNO3 + Ag, which element has been
oxidized?
Answer:
sodium I think .............
A packaging engineer is designing a container to hold hydrogen peroxide. The engineer knows that light speeds up the chemical reaction that
changes hydrogen peroxide into oxygen and water. How might the engineer use
that information when designing the container?
It’s science *
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:
The two gases, H2 and O2, were allowed to effuse under the same conditions through a pinhole. If the rate of effusion of O2 was 4.80 x 10-2 ms-1, what is the rate of effusion of H2?
The rate of effusion of H₂ : 7.2 x 10⁻² m/s
Further explanationGraham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or
the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
or
[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]
MW₁ O₂ = 32 g/mol
MW₂ H₂ = 2 g/mol
[tex]\tt \dfrac{1.8\times 10^{-2}}{r_2}=\sqrt{\dfrac{2}{32} }\\\\\dfrac{(1.8\times 10^{-2})^2}{r_2^2}=\dfrac{2}{32}\\\\r_2=0.072=7.2\times 10^{-2}~m/s[/tex]
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
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please i need the answer im dying here ;-
What happens when matter changes state? (choose one from the following :))
Its chemical properties change.
Its physical properties change.
The energy of its particles remains the same.
none of the above
Answer:
anawer is none of the above
Answer:
i think none of the above is the answer
While making chicken soup for his family one evening, Luis added the amount of salt the recipe called for. After tasting the soup, he decided the seasoning was correct. He then he let the chicken soup simmer for two hours to blend the flavors. But when he served the soup, it was too salty. What happened to the soup to make it so salty?
A. He added to much solvent
B. He added something else besides salt
C. Some of the chicken was saltier than the rest of it
D. Some water evaporated and concentrated the salt
Answer:
D
Explanation:
(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.
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.
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!!
How many moles of Fe are produced from 7 moles of Zn?
Zn(s) + FeSO4(aq) → ZnSO4(aq) + Fe(s)
Answer:
7 mol Fe
General Formulas and Concepts:
Chemistry
StoichiometryExplanation:
Step 1: Define
RxN: Zn (s) + FeSO₄ (aq) → ZnSO₄ (aq) + Fe (s)
Given: 7 moles Zn
Step 2: Stoichiometry
[tex]7 \ mol \ Zn(\frac{1 \ mol \ Fe}{1 \ mol \ Zn} )[/tex] = 7 mol Fe
Step 3: Check
We are given 1 sig fig.
Since our final answer is in 1 sig fig, there is no need to round.
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
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 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.
How many valence electrons are found in atoms of group 14?
Answer:
4 valence electrons.
Explanation:
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.
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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
Find the mass, in grams, of 7.50×1024 formula units of aluminum oxide.
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
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 % .
the oxidation of glucose by enzymes gives
Answer:
Carbondioxide, water and ATP
Explanation:
The reaction is called aerobic respiration because oxygen from the air is needed for it to work.
Calculate the energy and frequency of red light having a wavelength of 6.55 x 10⁻7m.
Answer:
E = 3.035× 10-¹⁹J = 1.9eV
f = 4.58 × 10¹⁴Hz
Explanation:
wavelength = 6.55 × 10-⁷m
c = 3 × 10⁸m/s
f = ?
E = ?
a) f = c/wavelength
f = 3 × 10⁸/6.55 × 10-⁷
f = 4.58 × 10¹⁴Hz
b) E = hc/wavelength
E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷
E = 3.035 × 10-¹⁹J
1ev = 1.6 × 10-¹⁹J
Therefore E = 3.035/1.6 = 1.9eV
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.
(h) Bohr stated that the energy of the electron is quantised. What does this mean?
Explanation:
It suggests that the extranuclear part consists of electrons in specific spherical orbits around the nucleus.
The concept is based on the premise that the electrons move round the nucleus in certain permissible orbits or energy levels. The ground state is the lowest energy state available to the electrons. It is the most stable state. The excited state is any higher energy level than the ground state. An electron in an energy level has a definite amount of energy associated with it at that level. The electron can undergo transitions from one level to another. This way energy of an electron is quantized to each level.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
Which is bigger an atom or a cell?
Answer:
Both are small
Explanation:
Atom comprises to die molecules, and cell comprise to for tissues
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."