This question is asking for the correct balanced reaction, when solid aluminum reacts with gaseous oxygen to form solid aluminum oxide, according to the law of conservation of mass, which demands us to have the same number of atoms of each element on both sides of the equation.
In such a way, we can start by knowing there is one aluminum atom on the left and two on the right whereas there are two oxygen atoms on the left and three on the right side of the equation.
The aforementioned means we must balance oxygen first by putting a 2 on aluminum oxide and a 3 on oxygen in order to cross multiply and obtain six oxygen atoms on both sides of the equation.
Moreover, the 2 on the aluminum oxide makes four aluminum atoms on the right, which means we must put a 4 on the left-handed aluminum in order to get the correct balance, and therefore, write the following balanced equation:
4Al(s) + 3O₂(g) ⇒ 2Al₂O₃(s)
Hence, the coefficient for Al, as asked, is 4.
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Answer:
Mass of 0.5 moles of CO2 is 22 gm.
Explanation:
1 mole of CO2 = 44 gm
0.5 mole of CO2 = 0.5 × 44 = 22 gm
It takes 25 mL of 0.20 M of hydrochloric acid (HCI) to neutralize 50 mL of
sodium hydroxide (NaOH). What is the concentration of sodium
hydroxide?
Answer:
0.1 M
Explanation:
(25 mL) (0.20 M) / 50 mL = 0.1 M
What is the percent, by mass, of water in MgSO4.2H20
Answer:51.1%
Explanation:
Mass percent : It is defined as the mass of the given component present in the total mass of the compound. Formula used : First we have to calculate the mass of and . Mass of = 18 g/mole Mass of = 7 × 18 g/mole = 126 g/mole Mass of = 246.47 g/mole Now put all the given values in the above formula, we get the mass percent of in . Therefore, the mass percent of in is, 51.1%
I hope you can see because I really need help! I’ll give you 5 stars!
Answer:
In the picture A kettle is boiling water and evaporating it we can see the water vapours coming out of the kettle and there is a paper on top of the kettle from where the water vapours are coming out .
Explanation:
is this right ?? i hope it helps
give explanation ~~
Why are cloudy nights warmer than clear nights?
arrange the compounds from lowest boiling point to highest boiling point.
Answer:
ion- ion> H - bonding > dipole > dipole> london dispersion
Q2. Fill in the blank with correct words.
A: Chemical B: Horizontal C: Shells D: Columns E: Group VII
1) The vertical ___________are called groups and the_____________rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer_______________ for example, all the elements in ___________ have 7
electrons on their outer shells.
3) Elements in the same group have similar ___________ and physical properties
Answer:
Explanation:
1) The vertical Columns are called groups and the Horizontal rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer Shells for example, all the elements in Group VII have 7
electrons on their outer shells.
3) Elements in the same group have similar Chemical and physical properties
Explanation:
1) Columns
Horizontal
2)Shell
Group VII
3)Chemical
dose any body know 2(-3+6)=
______
3
Answer: The answer is 6
1) Simplify -3+6 to 3.
2×3
And then Simplify.
6
Sorry if im wrong
Which of the following best describes a balanced reaction?
A) A reaction that has the sam number and type of atoms on each side of the equation
B) A reaction that has the same number of atoms on each side of the equation
C) A reaction that has the and type of atoms on each side of the equation
D) A reaction that has the same number of molecules on each side of the equation
Answer:
A reaction that has the same number and type of atoms on each side of the equation
Explanation:
A pex
Describe the S-wave shadow effect of earth quakes.
Answer: The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.
Explanation: 104 to 140 degrees from a given earthquake
what is the mechanical hound in the book fahrenheit 451
Explanation:
The Mechanical Hound is a robotic animal that firemen can deploy to hunt and catch fugitives. It can be trained and programmed to hunt its prey very quickly by smell. Once it catches its prey, the Hound injects the person with a sedative; unable to run, the drugged fugitive is easily captured.
in three to five sentences, predict the bonding activity between phosphorus and chlorine. why do you think they would bond that way?
The bonding activity that occurs between phosphorus and chlorine is Covalent Bonding
Covalent bonding is an interaction between two atomic elements that share electrons between themselves.
In Phosphorus Pentachlorine PCl₅, covalent bonding occurs between Phosphorus and Chlorine.
This is because, Phosphorus is the central atom that is attached to 5 different chlorine atoms, each chlorine atom needs one electron each to complete its octet rule and since phosphorus has five valence electrons in its outermost shell, it shares it with each of the chlorine atoms.
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Answer:
Covalent Bonding
4
Which statement about an ionic compound is not correct?
A It conducts electricity when dissolved in water.
B It has a high melting point due to strong attractive forces between ions.
с It has a regular lattice of oppositely charged ions in a 'sea of electrons'.
D The ionic bonds are formed between metallic and non-metallic elements.
Answer:
it conducts electricity when dissolved in water
Explanation:
the water molecules bond to positive and negative ions results to breaking of lattice and it's fixed position broken
Given that the molar mass of NaCl is 58. 44 g/mol, what is the molarity of a solution that contains 87. 75 g of NaCl in 500. ML of solution? Use Molarity equals StartFraction moles of solute over liters of solution EndFraction. 0. 333 M 0. 751 M 1. 50 M 3. 00 M.
Answer:
D
Explanation:
Given that the molar mass of NaCl is 58.44 g/mol, we want to determine the molarity of a solution that contains 87.75 g of NaCl in 500. mL of solution.
Recall that molarity is given by:
[tex]\displaystyle \text{M} = \frac{\text{ mols solute}}{\text{ liters soln.}}[/tex]
Therefore, we can convert the amount of NaCl in the solution to moles of NaCl and the volume from milliliters to liters:
[tex]\displaystyle \begin{aligned} \text{M} & = \frac{(87.75 \text{ g NaCl})}{(500. \text{ mL soln.})} \cdot \frac{1 \text{ mol NaCl}}{58.44 \text{ g NaCl}} \cdot \frac{1000 \text{ mL soln.}}{1 \text{ L soln.}} \\ \\ & = 3.00\text{ } \frac{\text{mol NaCl}}{\text{ L soln.}} \\ \\ & = 3.00 \text{ M} \end{aligned}[/tex]
Hence, our answer is D.
Pls help if you only know the correct answer! Thanks! :)
Answer:
i think itd be an exothermic reaction
Explanation:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.
what happens when carbon dioxide gas is cooled to -78 degree Celsius
Answer:
It will be solid
Explanation:
-78 C° is the freezing point of carbon dioxide, so at the temperature of -78 Celsius, the particles of carbon dioxide will come closer together and have about a fixed position to vibrate. The carbon dioxide will turn into solid. The solid form of carbon dioxide is also called dry ice.
4. A photon has an energy of 2.93x10^-25 Jouls. What is the
frequency? What is the wavelength in nm?
Answer:
Hope this answer helps
Explanation:
Calculate the following. Be sure to follow significant figure rules.
1.) 1.2 m + 2.35 m =
Ignore me I dont know what im doing.
what is the difference between hydrophilic and hydrophobic?
Which statement about the Periodic Table is correct?
A Elements are arranged in order of decreasing proton number.
B Group number is the number of electron shells in atoms of the elements in the group.
C Group numbers can be used to predict the charges of ions.
D Metallic character increases left to right across a period.
answer :c
explanation :
group numbers can be used to determine the number of electrons in the outer most shell thus if the group numbers are above four then the elemnts are negative ions if less than four then posetive
4. Which of the following statements accurately compares the wavelengths of the waves shown below?
A) wave 1 has a smaller wavelength than wave 2
B) wave 1 has a larger wavelength than wave 2
C) wave 2 has a larger wavelength than wave 1
D) wave 1 and wave 2 have the same wavelength
Answer:
B. wave 1 has a larger wavelength than wave 2
Wave 1 has larger wavelength than wave 2. Hence, option B is correct.
What is Wavelength?Wavelength is defined as "the difference between two successive crests and troughs of the wave. The wavelength described the how long wave is. It is measure in the direction of wave.
Wavelength is usually denoted by the Greek letter ( λ ).
Wavelength is equal to the speed ( V ) of wave train to divided by frequency ( F ). It is given as,
λ = V ÷ F
Here,
λ = wavelength
V = speed
F = frequency
The distance between one crests (top) to another crests is a Wavelength. Alternately the distance between one troughs (bottom) to another troughs is wavelength.
The distance between two crests in wave 1 is more comparatively wave 2 so , wave 1 will have larger wavelength than wave 2.
Therefore, wavelength is used for measuring the radiation.
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Vinegar is an acid. Based on
what you know about the
properties of acids and bases,
which would you expect from
vinegar?
A. It should feel slippery.
B. It will release OH-in water.
C. It will release H+ in water.
Answer:
C
Explanation:
Acids contain H plus ions. When within a solution or neutralised these ions are released.
The substance which gives H+ ion are called as acid. Vinegar is an acid because it will release H+ in water. Therefore, option C is correct.
What is vinegar ?Acetic acid and water are combined to create vinegar through a two-step fermentation process. First, yeast consume any liquid derived from a plant source, such as fruits, whole grains, potatoes, or rice, and feed on the sugar or starch therein. It ferments into alcohol.
White vinegar typically contains 93–96% water and 4-7% acetic acid. It can be used to cook, bake, clean, and control weeds. It may also help with weight loss and decrease cholesterol and blood sugar levels.
The sugar is converted to ethanol (ethyl alcohol) by yeast and bacteria in a two-step fermentation process, which is followed by the production of acetic acid. Vinegar is acidic because it contains acetic acid.
Thus, option C is correct.
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11. The ease with which water can pass
through a rock or sediment is called
a. permeability c. porosity.
b. carbonation. d. velocity
Answer:
It's option a) Permeability.
question: the diagram below shows the major parts of the digestive system.
what part of the digestive system is labeled by the number 1?
A.
small intestine
B.
esophagus
C.
stomach
D.
mouth
Answer:
I got it Right in Study Island
Explanation:
What is a Chemical Properties and Physical Properties? Please tell me the deffinition of them both.
Answer:
All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. ... Physical properties can be measured without changing a substance's chemical identity. Chemical properties can be measured only by changing a substance's chemical identity.
Explanation:
What is the enthalpy of combustion when 1 mol C6H6(g) completely reacts with oxygen? 2C6H6(g) 15O2(g) mc001-1. Jpg 12CO2(g) 6H2O(g) â€""6339 kJ/mol â€""3169 kJ/mol 1268 kJ/mol 6339 KJ/mol.
The enthalpy of combustion of 1 mole of benzene is 3169 kJ/mol .
The first step in answering this question is to obtain the balanced thermochemical equation of the reaction. The thermochemical equation shows the amount of heat lost or gained.
The thermochemical equation for the combustion of benzene is;
2 C6H6(l) + 15 O2(g) → 12 CO2(g) + 6 H2O(g) ΔrH° = -3169 kJ/mol
We can see that 1 mole of benzene releases about 3169 kJ/mol of heat.
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Answer:
-3169 kJ/mol
Explanation:
what is an observation?
Answer:
the act of watching somebody/something carefully, especially to learn something
Explanation:
hope this helps you!
Answer:
hope this helps
Explanation:
noun
noun1.
noun1.the act of watching somebody/something carefully, especially to learn something
what are the products of any combustion reaction involving a hydrocarbon
Answer:
The products of the combustion of hydrocarbons are carbon dioxide and water. Many hydrocarbons are used as fuel because their combustion releases very large amounts of heat energy.
Answer:
The products of the combustion of hydrocarbons are carbon dioxide and water. Many hydrocarbons are used as fuel because their combustion releases very large amounts of heat energy.
Explanation:
Lead has an atomic number of 82. Which statement describes all neutral atoms and ions of lead?
Neutral atoms of lead must have 82 electrons. Ions must have 82 electrons, as well.
Neutral atoms of lead must have 82 neutrons, but ions can have more or fewer.
Neutral atoms of lead must have 82 protons. Ions must have 82 protons, as well.
Neutral atoms of lead must have 82 protons, but ions can have more or fewer.
The neutral atom of lead must have 82 protons while ions can have b or less than 82.
The atomic number of an element is the number of protons in the nucleus of the element.
Also, for neutral atoms, the number of protons equals the number of electrons.
In ionic form, the number of protons/electrons of an atom may vary and be different from that of the neutral form.
Positive charges mean that the ion has less proton than its neutral version while negative charges mean that it has more electrons than its neutral version.
Thus, the neutral atom of lead will contain an equal number of protons as the electrons while its ionic form can have more or less than 82 protons.
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True or false? In giant covalent structures the atoms form strong bonds by sharing electrons.
Answer:
True
Explanation:
its true don't lie on here please
In giant covalent structures such as graphite or diamond, the atoms form strong bonds by sharing electrons. Therefore, the given statement is true.
What is a covalent bond?A covalent bond can be defined as a chemical connection formed by the sharing of electron sets between particles. A covalent bond can be created by the mutual sharing of electrons from both atoms.
The pair of electrons that are shared in this kind of bonding is known as the shared or bonding pair. Covalent bonds are the sharing of bonding pairs of electrons that will provide the stability of the atom in its outer shell.
Elements that have very high ionization energies are incapable of exchanging electrons or elements having low electron affinity cannot accept electrons. Covalent bonding between two non-metallic atoms is characterized by the equal sharing of electrons between the atoms and covalent bonds with an electronegativity difference of participating atoms is more than 2.0.
Therefore, a giant structure like a diamond has strong covalent bonds that require a lot of energy to break.
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