How does the law of conservation of mass apply to this reaction: C2H4 + O2 → H2O + CO2?
If less than 1% of ethanoic acid is ionized in an instant, ethanoic acid is considered a __________ acid. hydrochloric weak strong sulfuric
If 65.1L of N2(g) is needed to properly inflate an airbag, how many grams of NaN3(s) are needed for the reaction
Calcite (the main mineral in limestone) is made of calcium carbonate (CaCO3). Dolomite, a related mineral, is made of magnesium carbonate (MgCO3). What happens if a geologist drips a small amount of vinegar (acetic acid) onto a sample of dolomite?
Answer: CO₂ will be formed, with the consequent fizzing effect.
Explanation:
1) Look at the chemical reaction that happens between magnesiumm carbonate and vinegard
MgCO₃(aq) + CH₃COOH(l) → CO₂ (g) + MgCOOH(aq) (it is not balance as it is only to show the products formed not to make calculations).
2) Then you see that CO₂ is evolving in the form of gas. That will cause the formation of bubbles (fizzing).
Dolomite is an anhydrous magnesium carbonate mineral that reacts with acetic acid (vinegar) to produce fizzing because of the carbon dioxide gas produced.
What is effervescence?Effervescence is a fizz or release of bubbles of gases when it reacts with another substance. Carbon dioxide is released with a fizzing effect.
The reaction between dolomite and vinegar is shown as:
[tex]\rm MgCO_{3}(aq) + 2 CH_{3}COOH(l) \rightarrow CO_{2} (g) + H_{2}O + Mg(CH_{3}COO)_{2}[/tex]
From the reaction, it can be said that the release of carbon dioxide results in effervescence or fizz.
Therefore, a drop of acetic acid on dolomite results in effervescence.
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If the partial pressure of carbon dioxide gas in a blood capillary is 45 mm hg, what is the pressure expressed in inches of mercury? 0.059 in. hg 1.8 in. hg 4.5 in. hg 1,100 in. hg 0.87 in. hg
An oxidation reaction occurs only in the presence of _____.
Final answer:
An oxidation reaction requires the presence of an oxidizing agent.
Explanation:
Oxidation reaction are part of a larger set of reactions known as oxidation-reduction reactions, which involve the transfer of electrons. The term 'oxidation' itself originally referred to reactions involving molecular oxygen a key factor in these processes. However, the concept has broadened over time to cover any reaction where there is a loss of electrons, leading to an increase in the oxidation state of an element.
For example, compounds of elements in high oxidation states tend to act as oxidants and become reduced in chemical reactions. Every oxidation must be accompanied by a reduction. In chemical terms, the reducing agent is the species being oxidized because it loses electrons, whereas the oxidizing agent is the species being reduced, as it gains those electrons.
Who was the first scientist to propose that the atom had a dense nucleus which occupied only a small fraction of the volume of the atom?
Ernest Rutherford was the first scientist to propose that the atom had a dense nucleus that occupied only a small fraction of the volume of the atom.
What are atomic models?There are some models that are used to explain the arrangements of subatomic particles inside the atom based on the atomic theory of atoms known as the atomic models.
There are many types of atomic models proposed in past based on their individual assumptions and the experimentations
Rutherford's discovery demonstrated that the majority of an atom is essentially blank space and that the center only takes up a very small portion of the entire atom, which had an impact on Thomson's commonly accepted atomic model.
Thus, Ernest Rutherford was the first scientist to propose that the atom had a dense nucleus that occupied only a small fraction of the volume of the atom.
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NEED HELP FAST, THANKS!
What is the distance between two consecutive troughs called? A. period length B. trough length C. amplitude length D. wavelength
Identify the atom represented by this electron configuration and elaborate on its bonding properties.
1s22s22p63s23p64s23d5
A) .Chromium is a transition with a half full-valence orbital and can form up to six bonds. B) Antimony is a metalloid that can form five covalent bonds or three metallic bonds. C) Manganese is a transition metal that can form up to five stable ionic bonds D) Bromine is a non-metal that forms one ionic bond or a variable number of covalent bonds.
The electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵ represents the element Chromium (Cr), a transition metal with a notably stable half-filled 3d subshell. Chromium can undergo hybridization and is capable of forming complex ions, including the ability to form up to six bonds in certain complexes. Option A is correct .
The electron configuration given is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵ which corresponds to the element Chromium (Cr). Chromium tends to have exceptions to predicted electron configurations due to enhanced stability associated with half-filled or completely filled subshells.
The presence of a half-filled 3d subshell alongside a singly occupied 4s orbital is more stable than expected configurations. As for bonding properties, Chromium is a transition metal known for its ability to exhibit variable oxidation states and form complex ions, primarily through its valence electrons in the 3d and 4s orbitals.
When forming bonds, it is common for transition metals like Chromium to undergo hybridization, combining their s, p, and d orbitals to form new hybrid orbitals that can result in different geometries and bonding capabilities.
For instance, the hybridization can result in d²sp³ hybrid orbitals, which can form octahedral complexes with ligands. In the case of Chromium (III), which has an electron configuration of 3d³ after losing its 4s electron and two 3d electrons, it can form up to six bonds, as seen in complexes such as the octahedral hexaamminechromium (III) cation.
Potassium chloride (KCl) is sometimes used to treat low blood potassium levels. Calculate the concentration of a saturated solution of potassium chloride at 20°C. Question continued-?
Hint: The formula for molarity, a common concentration unit, is M = moles/volume of solution expressed in units of mol/L. You will need to convert from grams of KCl to moles. Assume the volume of solution is 100 mL. Show your work!
Info: 36g of KCl is the max 100mL of water could hold at 20°C.
which element is in the same "family" as chlorine (Cl) and fluorine (F)?
a. bromine (Br)
b. oxygen (o)
c. hydrogen (h)
d. lithium (Li)
Bromine (Br) is in the same halogen family as chlorine (Cl) and fluorine (F) because they share similar chemical properties and have the same number of valence electrons. Option A is correct .
The element that is in the same 'family' as chlorine (Cl) and fluorine (F) is bromine (Br). These elements are part of the halogen family in the periodic table. Halogens are found in Group 17, and they share similar chemical properties, such as high reactivity and the tendency to form salts with metals.
For clarification, elements in the same group or family have the same number of valence electrons, which contributes to their similar chemical behavior. Bromine, like chlorine and fluorine, has seven valence electrons and forms similar types of compounds.
Oxygen (O), hydrogen (H), and lithium (Li) belong to different families: oxygen is a chalcogen, hydrogen is often placed in its own group due to its unique properties, and lithium is an alkali metal. Option A is correct .
describe the difference between a monoprotic acid and a triprotic acid. How does a triprotic acid generate hydrogen ions?
Monoprotic acids contain one ionizable hydrogen atom, while triprotic acids contain three ionizable hydrogen atoms. Triprotic acids, like phosphoric acid, generate hydrogen ions through stepwise ionization reactions.
Explanation:A monoprotic acid is an acid that contains only one ionizable hydrogen. Examples of monoprotic acids include hydrochloric acid (HCl) and acetic acid (CH3COOH). On the other hand, a triprotic acid is an acid that contains three ionizable hydrogens. An example of a triprotic acid is phosphoric acid (H3PO4).
When a triprotic acid like phosphoric acid dissociates, it releases hydrogen ions (H+) in a stepwise manner. The acid goes through a series of ionization reactions, each removing one proton. For example, phosphoric acid first donates one hydrogen ion (H+) to form dihydrogen phosphate ion (H2PO4-), then donates a second hydrogen ion to form hydrogen phosphate ion (HPO42-), and finally donates the third hydrogen ion to form phosphate ion (PO43-).
What will most likely happen if a sound wave moves from the air through a solid?
Answer:
D
Explanation:
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What is defined as the absorption of oxygen and the release of carbon dioxide by cells?
Answer:
Cellular respiration
Explanation:
Oxygen is required by the cell in the Krebs cycle as the ultimate proton acceptor (creating water an end product during making out ATPs). During the conversion of pyruvate from glycolysis to Acetyl-CoA that enters the Krebs cycle, the pyruvate is decarboxylated (or oxidized) hence creating carbon IV oxide as a byproduct.
Which or the following solutions would have the highest concentration of hydronium ion and why?
A)1.0×10^-3 M HCl
B)1.0×10^-3 M HC2 H3 O2
C)0.050 M HCl
D)0.050 M HC2 H3 O2
(I already know that the answer is C I just don't know why)
Which carbohydrate provides energy for cows but only dietary fiber for humans?
A-cellulose
B-starch
C-glycogen
D-sucrose
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Analyze the shape of H2O.
What is the shape of the H2O molecule?
Is it symmetrical?
Does this mean that the H2O molecule is polar or nonpolar?
Answer:
The answers are in the explanation.
Explanation:
Analyze the form of H2O: The water molecule is composed of an oxygen atom, linked to two hydrogen atoms. The oxygen atom shares one pair of electrons with each hydrogen atom, leaving two pairs of free electrons in the oxygen without sharing.
What is the shape of the H2O molecule? The pairs of unshared electrons exert a repulsion, so the molecule acquires the angular shape.
Is it symmetrical? The H2O molecule is asymmetric due to free electron pairs.
Does this mean that the H2O molecule is polar or non-polar? Does this mean that the molecule is polar, as the uneven distribution of electrons gives it a slightly negative charge near the oxygen atom and a slightly positive charge near the hydrogen atoms.
Have a nice day!
The H2O molecule looks like a bent or V-shaped. This is made up of two hydrogen atoms connected to a middle oxygen atom.
The H2O molecule is not symmetrical due to the lone pairs on the central oxygen atom.
The H2O molecule is polar due to the bent shape and unequal distribution of electron density.
What is the shape of the H2O molecule?This arrangement makes the molecule have a curved shape. The H-O-H bond is polar because the oxygen and hydrogen have different attraction strengths.
However, the bent shape of the molecule creates an overall polarity. In water (H2O), the oxygen atom has a stronger pull on the shared electrons compared to the hydrogen atoms. This makes the oxygen atom attract the electrons closer to itself. As a result, one end of the molecule has a little bit more negative charge, while the other ends have a little bit more positive charges.
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A 34.53 ml sample of a solution of sulfuric acid, h2s04, reacts with 27.86 ml of 0.08964 m naoh solution. calculate the molarity of the sulfuric acid solution
Final answer:
The molarity of the sulfuric acid solution is calculated by first determining the moles of NaOH used in the titration, then finding the corresponding moles of H2SO4 using the 1:2 mole ratio from the balanced equation, and finally, dividing the moles of H2SO4 by its volume in liters.
Explanation:
To calculate the molarity of the sulfuric acid solution, we need to follow these steps:
Write down the balanced chemical equation for the reaction: H2SO4 (aq) + 2NaOH (aq) → Na2SO4 (aq) + 2H2O (l).
Calculate the moles of NaOH used in the titration. Since the molarity of NaOH is given as 0.08964 M and the volume used is 27.86 mL, the moles of NaOH is (0.08964 M)(0.02786 L) = 0.002496 moles.
From the balanced equation it's evident that the mole ratio of H2SO4 to NaOH is 1:2, thus the moles of H2SO4 will be half the moles of NaOH, which is 0.002496 / 2 = 0.001248 moles.
Finally, divide the moles of H2SO4 by the volume of the sulfuric acid solution in liters to get the molarity of the solution. Therefore, molarity = 0.001248 moles / 0.03453 L = 0.03612 M.
For each pair of gases, select the one that most likely has the highest rate of effusion. Use the periodic table if necessary.
Answer:
Hydrogen
Methane
Ammonia
Fluorine
Explanation:
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A rock contains uranium 238 which has a half life of 4.5 billion years. if the rock is crushed and heated, the half life in urainium-238 will
Crushing and heating a rock containing uranium-238 does not change its half-life, which remains 4.5 billion years.
The half-life of a radioactive isotope like uranium-238 is the time it takes for half of its atoms to decay into another element.
For uranium-238, this duration is 4.5 billion years.If a rock containing uranium-238 is crushed and heated, the half-life of the uranium-238 will remain the same.This is because the half-life is a fundamental property of the radioactive nucleus and is not affected by external conditions like crushing or heating.To summarize, the process of crushing and heating the rock does not alter the radioactive decay process or the half-life of uranium-238, which will remain constant at 4.5 billion years.
Draw the electron dot formula for the hypochlorite ion, clo-. how many nonbonding electron pairs are in a hypochlorite ion? 1 6 7 2 none of the above
Write a nuclear reaction for the neutron-induced fission of u?235 to produce te?137 and zr?97. how many neutrons are produced in the reaction?
Calculate the number of moles of naoh present in 11.2 ml of 2.50 m naoh solution
Answer:
0.028 moles
Explanation:
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What is the molecular formula of a compound whose molar mass is 88 and whose percent composition is 54.5% carbon, 9.1% hydrogen, and 36.4% oxygen?
Answer:
C₄H₈O₂
Explanation:
Which is a characteristic of unsaturated fats?
A_They come from plant steroids.
B_They make up most animal fats.
C_They are liquids at room temperature.
D_They easily stack on top of each other.
Atoms that have a positive or negative electrical charge are called ________.
A. magnetic
B. isotopes
C. metals
D. ions
Answer: ions
Explanation:
Consider the rate below
R=K(L)^2(XY)
What is the overall order of the reactants in this reaction? 0 1 2 3
What is a reaction with a positive enthaply spontaneous
Which formula shown is incorrect for the name given? Which formula shown is incorrect for the name given? calcium nitrate: Ca(NO3)2 ammonium cyanide: NH4CN strontium carbonate: SrCO3 potassium acetate: KC2H3O2 lithium sulfate: LiSO4
Answer:
5.Lithium sulfate:[tex]LiSO_4[/tex]
Explanation:
We have to find the formula which is incorrect for the name given
1.Calcium nitrate :[tex]Ca(NO_3)_2[/tex]
We know that Charge on calcium ion =+2
Charge on nitrate ion=-1
Therefore, the formula of calcium nitrate is [tex]Ca(NO_3)_2[/tex].
Hence, it is true.
2.Ammonium cyanide:[tex]NH_4CN[/tex]
Charge on ammonium ion=+1
Charge on cyanide ion=-1
Therefore, the formula of ammonium cyanide is [tex]NH_4CN[/tex].
Hence, it is true.
3.Strontium carbonate :[tex]SrCO_3[/tex]
Charge on strontium ion=+2
Charge on carbonate ion=-2
Therefore, the formula of strontium carbonate is [tex]SrCO_3[/tex].
Hence, option is true.
4.Potassium acetate:[tex]KC_2H_3O_2[/tex]
Charge on potassium ion=+1
Charge on acetate ion=-1
Therefore , the formula of potassium acetate is [tex]KC_2H_3O_2[/tex].
Hence, option is true.
5.Lithium sulfate:[tex]LiSO_4[/tex]
Charge on lithium ion=+1
Charge on sulfate ion=-2
Therefore, the formula of lithium sulfate is [tex]Li_2SO_4[/tex].
But given formula is [tex]LiSO_4[/tex].
Hence, option is false.
How many unshared pairs of electrons does the nitrogen atom in ammonia possess?
The nitrogen atom in an ammonia molecule has one lone pair of electrons.
The nitrogen atom in an ammonia molecule (NH₃) has five valence electrons. According to its Lewis structure, nitrogen forms three covalent bonds with three hydrogen atoms. Each hydrogen atom donates one electron, filling its valence shell.
Nitrogen uses three of its five valence electrons in these bonds, resulting in three bonding pairs shared between nitrogen and hydrogen. The remaining two valence electrons on the nitrogen atom do not participate in bonding and are thus termed an unshared pair or a lone pair.
Therefore, the nitrogen atom in ammonia possesses one lone pair of electrons.
Why does inhaled air need to be warmed filtered and moistened?
Inhaled air is warmed, filtered, and moistened to protect the respiratory system from damage caused by cold, dry, and particulate-laden air. These processes maintain respiratory health by equilibrating the inhaled air to body conditions and acting as protective mechanisms against infection and irritation to the lungs and trachea.
Inhaled air needs to be warmed, filtered, and moistened as part of the respiratory process in mammals. When air is inhaled through the nasal cavity, it is warmed to body temperature, which helps in reducing the shock to the system that cold air might cause. The air is then humidified by picking up water from the mucus lining the respiratory tract, which serves to equilibrate the air to the body's conditions. This humidification is crucial as it prevents the dryness that could damage the delicate tissues within the respiratory system. Furthermore, as the air passes through the nasal passages, particulate matter is trapped by hairs, mucus, and cilia, effectively filtering out potential irritants or harmful substances. These processes collectively prevent damage to the trachea and lungs, serving as important protective mechanisms to maintain respiratory health. Moreover, this filtering also plays a role in warding off infection, which along with the warming and moistening actions, decreases sensitivity during breathing and prevents damage to the lungs.