When magnesium reacts with hydrochloric acid the following result occurs.
A. A solid is formed.
B. There is a color change.
temperature change
C. There is a
D. Energy is taken in.
A 50.0 g sample of an unknown
compound contains 14.19 g Na,
19.76 g O, and 16.05 g Cr. What is
the percent composition of O in the
compound?
[?]% O
Round your answer to the hundredths place.
Taking into account the definition of percent composition, the percent composition of O in this sample is 39.52%.
Definition of percent compositionThe percent composition is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.
The percent composition is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:
percent composition= (mass of solute÷ mass of solution)× 100%
Percent composition of OIn this case, you know that a 50 g sample contains 14.19 g of Na, 19.76 g of O, and 16.05 g of Cr.
Dividing the amount of mass of O present by the mass of the sample and multiplying it by 100, the percent composition of O can be obtained:
Percent composition of O= (19.76 g÷ 50 g)× 100%
Percent composition of O= 39.52%
Finally, the percent composition of O in the compound is 39.52%.
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A polyatomic ion is several ________ bonded together with ___________ ionic charge.
Answer:
A polyatomic ion, also known as a molecular ion, is a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero. They form a stable grouping which carries a charge (positive or negative). The group of atoms as a whole acts as a charged species in forming an ionic compound with an oppositely charged ion.
i need asap ill give big points
How does energy transfer cause water levels to drop in Lake Mead?
Answer:
Pipes direct water from Lake Mead down to the bottom of the dam. The water picks up speed as it falls; gravitational energy turns the turbines.
Explanation:
Answer
Which of the following explains why saltwater is considered a mixture?
It is composed of two or more substances and has new chemical properties.
O It is composed of one element
O It is composed of two or more substances that retain their own chemical properties.
O
It is composed of one compound
Answer:
the answer is the option ANitrogen and hydrogen combine at a high temperature, in the presence of a catalyst, to produce ammonia.
N2(g)+3H2(g)⟶2NH3(g)
Assume 0.290 mol N2 and 0.954 mol H2 are present initially.
After complete reaction, how many moles of ammonia are produced?
Answer:
17 reactions
Explanation:
What causes a substance to undergo a phase change?
Answer: Substances can change phase — often because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.
Explanation:
The solubility product for tin II hydroxide (Sn(OH)2) is Ksp = 5.5 x 10^27
For which of the following solutions will the molar solubility of Sn(OH)2 be the largest?
a) A pH = 4.00 buffer solution
b) A pH = 6.00 buffer solution
c) A pH = 7.00 buffer solution
d) A pH = 8.00 buffer solution
e) A pH = 10.00 buffer solution
Answer:
Answer: e) A pH = 10.00 buffer solution
3. When a substance is dissolved in water,___.
it lowers the boiling point.
the is prevented from boiling.
it raises the boiling point.
it raises the freezing point.
Answer:
it raises the boiling point.
Explanation:
BONUS:When a substance is dissolved in water,the boiling point will INCREASEand the freezing point will DECREASE.What mass of H2 forms when
35.25 g Al reacts with excess
hydrochloric acid?
The mass of [tex]H_2[/tex] that will be formed when 35.25 g Al reacts with excess hydrochloric acid would be 3.93 g.
Stoichiometric problemThe equation of the reaction of aluminum metal with hydrochloric acid to produce hydrogen gas is represented below:
[tex]2Al + 6HCl -- > 2AlCl_3 + 3H_2[/tex]
From the equation, one would see that the mole ratio of aluminum to the hydrogen gas produced is 2:3.
Now, with 35.25 g of aluminum, recall that: mole = mass/molar mass.
The molar weight of aluminum is 27 g/mol.
Thus:
Mole of 35.25 g Al = 35.25/27
= 1.31 mol
From the mole ratio, the mole of hydrogen that will be produced would be:
3/2 x 1.31 =1.97 mol
The molar mass of [tex]H_2[/tex] is 2 g/mol, the mass of 1.97 mol hydrogen gas can be calculated as:
Mass = mole x molar mass
= 1.97 x 2
= 3.93 grams
In other words, the amount of [tex]H_2[/tex] that would be formed when 35.25 g All reacts with excess hydrochloric acid would be 3.93 g.
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Compare and contrast the terms primary standard and secondary standard
Reagents are primary standards that can be used in chemical processes. These substances are frequently employed to figure out the concentration of a solution that can interact chemically with the primary standard but whose concentration is unknown. The term "secondary standard solution" refers to a solution developed expressly for a given analysis.
What is Primary and secondary standard solution?A reagent with a high degree of purity is called a primary standard solution. It has a highly accurate concentration that mirrors the solute's molar concentration. Because of its purity, it may be used to accurately determine the mass to volume ratio.
The term "secondary standard solution" refers to a solution developed expressly for a given analysis. A secondary standard is a substance whose active agent content was discovered by comparison with a primary standard. This means that it is frequently bench marked against a major standard.
A primary standard solution is one that has a high purity and is less reactive. Secondary standards are not as pure as primary standards and are more chemically reactive.A primary standard solution is sterile. A secondary standard solution isn't very pure.A major standard solution, on the other hand, is not as reactive. A secondary standard solution is more reactive in comparison.A hygroscopic primary standard solution does not exist. A secondary standard solution is hygroscopic in various ways.A solution of primary standards used to standardize secondary standards and other reagents. For particular analytical chemistry studies, a secondary standard solution is utilized.To know more about concentration refer to:
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A gas at 91 c occupies a volume of 0.67 L at what Celsius temperature will the volume increase to 1.37 L
The temperature of the gas when the volume increase from 0.67 L to 1.37 L is 471.29 °C.
What is temperature?Temperature is the hotness or coldness of a thing or place.
To calculate the temperature in Celsius when the volume increase, we use the formula below.
Formula:
T' = V'T/V......... Equation 1Where:
T' = Final TemperatureT = Initial TemperatureV' = Final volumeV = Initial volumeFrom the questuion,
Given:
V = 0.67 LV' = 1.37 LT = 91 °C = (273+91) K = 364 KSubstitute these values into equation 1
T' = (1.37×364)/0.67T' = 744.29 KT' = (744.29-273) °C = 471.29 °CHence, the final temperature of the gas is 471.29 °C.
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Equilibrium is established for the reaction 2 X(s) + Y(g) ⇌ 2 Z(g) at 500K, the Kc value is 100.
Determine the concentration of Z in equilibrium with o.2 mol of X and 0.50 M of Y at 500K
Answer:
Equilibrium is established for the reaction 2 X(s) + Y(g) ⇌ 2 Z(g) at 500K, the Kc value is 100.
Determine the concentration of Z in equilibrium with o.2 mol of X and 0.50 M of Y at 500K
answer
At equilibrium, the concentrations of X and Y will remain constant, so we can use the Kc expression to solve for the concentration of Z:
Kc = [Z]^2 / [X]^2
[Z]^2 = Kc * [X]^2
[Z]^2 = 100 * (0.2)^2
[Z] = √(100 * 0.04)
[Z] = 0.2 M
Carbon atoms always need four bonds to attain stability. Draw in the hydrogen atoms at the appropriate spots in the Lewis structure of the hydrocarbon chain to get a stable molecule.
As carbon always need four bound to stain stability which means it need eight electron in its valance cell.
Describe the Lewis Structure.The valence shell electrons is defined as the electrons in which a molecule are depicted in an extremely easy manner by a Lewis Structure. It is used to signify how the electrons in a molecule are positioned near the particular atoms. Electrons are denoted as "dots" or, in the case of a bond, as a line connecting with the two atoms.
Describe stability.If an atom, molecule, or ion has the average amount of bonds for that species, it has a formal charge of zero. The more stable Lewis structure is the one that has the highest charges on the atoms closest to zero. The aforementioned SO Lewis structure is as follows.
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what is meiosis cell divison?
Answer:a type of cell division in sexually reproducing organisms that reduces the number of chromosomes in gametes
Explanation:
Answer:
Its a type of cell division that reduces chromosomes.
Explanation:
I believe not 100% sure tho.
The _______ atom in a water molecule points toward the sodium ion because its partial _______ charge is attracted to the sodium ion's ______ charge. This is called _______.
Answer:
Below
Explanation:
Oxygen negative positive hydration
The oxygen atom in a water molecule points toward the sodium ion because its partial negative charge is attracted to the sodium ion's positive charge. This is called hydration.
In a water molecule, the oxygen atom is more electronegative than the hydrogen atoms, causing it to pull the shared electrons in the covalent bonds closer to itself. As a result, the oxygen atom gains a partial negative charge (δ-) due to the presence of these electron-rich lone pairs.
On the other hand, when sodium chloride (NaCl) or any other ionic compound dissolves in water, it dissociates into its constituent ions (Na⁺ and Cl⁻). The positively charged sodium ion (Na⁺) attracts the partial negative charge on the oxygen atom of the neighboring water molecules.
This electrostatic attraction between the partial negative charge on the oxygen atom and the positive charge on the sodium ion is called an ion-dipole interaction. It is one of the primary forces that drive the dissolution of ionic compounds in polar solvents like water.
When many water molecules surround the sodium ion, with their oxygen atoms pointing toward it and forming ion-dipole interactions, the process is called solvation or hydration. The water molecules effectively surround the sodium ion, separating it from the rest of the sodium chloride crystal and keeping it in solution. This is a crucial process in dissolving ionic compounds in water and making them available for various chemical reactions and biological processes.
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Fermentation is the name of a chemical change that_________.
A. Converts sugars into acids, gases or alcohol.
B. Turns leaves various colors in the Autumn.
C. Converts yeast to a gas.
Answer:
A. Converts sugars into acids, gases or alcohol.
The percent error for the data set is 12%, which is greater than 5%. The range of the data is 0.1, which is considered very close together.
Which sets of terms describes the accuracy and precision of the data?
A. The data is both accurate and precise.
B. The data is not accurate but is precise.
C. The data is accurate but not precise.
D. The data is neither accurate nor precise.
The percent error of the result is very high. Which means the accuracy of the data is very low. But the range of values are close to 0.1. Thus, the data is precise but not accurate.
What is accuracy?Accuracy of a result is its closeness of the calculated or experimental value to the true value or accepted value. Thus, it tells that, how much the data can be taken to be true.
Precision is the closeness between the results of the same experiment. An experiment if done in several trails, where the result of each time are closer then it is said to be precise.
The given results has 12% error thus, it is far from the true value indicates that the data is not accurate. But the data points comes in a close range of values. Thus. the data is precise.
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A sample of ideal gas at room temperature occupies a volume of 29.0 L at a pressure of 342 torr . If the pressure changes to 1710 torr , with no change in the temperature or moles of gas, what is the new volume, V2 ? Express your answer with the appropriate units.
Ideal gas law is valid only for ideal gas not for vanderwaal gas. To solve such, we need to know the relation between rate of effusion and molar mass of gases. Therefore, the new volume V₂ is 18L.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. an ideal gas on the walls of the container is inversely proportional to the volume occupied that gas.
Mathematically, Boyle's law can be written as
P₁V₁ = P₂V₂
P₁=initial pressure=342 torr
P₂=final pressure=1710 torr
V₁ = initial volume= 29.0 L
V₂=final pressure=?
Substituting all the given values in the above equation, we get
V₂ = P₁V₁/P₂
V₂ = (342 × 29.0)/1710
V₂ = 18L
Therefore, the new volume V₂ is 18L.
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The large number before a molecule is called what
Answer: A coefficient
Explanation:
Example of a coefficient - 2H₂O
The 2 is the coefficient
the scientist most likely answer by examining this fossil?
average monthly rainfall in the area?
=r was absorbed by the roots of the plant?
en was in the atmosphere surrounding the plant?
wironment like in the area when the plant was alive? ASAP IN 5-10 minutes
The scientist most likely answer by examining this fossil is the environment like in the area when the plant was alive which is therefore denoted as option D.
What is a Fossil?This is referred to as the remains of plants and animals which have been preserved in the earth crust.
Fossils are very important as it gives an insight into how life and humans came from and also the various ways in which the Earth and our environment has changed over the years through the presence and absence of various structures which is therefore the reason why option D was chosen as the correct choice.
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The reaction between water and ammonium nitrate results in_____.
A. Light is emitted.
B. A precipitate (solid) is formed.
C. A temperature increase.
D. A temperature decrease.
The reaction between water and ammonium nitrate results in increase in a temperature.
Hence, Option C is the correct answer.
When ammonium nitrate is dipped in a beaker which contains the water, the beaker becomes cold because it is an endothermic reaction. The endothermic reaction is a reaction that it absorbs energy from the outside in the form of heat.
Thus we can say that hydrating ammonium nitrate is an endothermic reaction, because of that the beaker becomes cold.
We feels cold when ammonium nitrate is mixed in water that shows an endothermic reaction. In an endothermic reaction, the ammonium nitrate mixed in water, a chemical reaction occurs which absorbs heat rather than releases it.
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How would you prepare 750 mL of a 10 fold dilution of a 17 M solution of acetic acid? How would you prepare 200 mL of a 20 fold dilution of a 17 M solution of acetic acid?
A) The volume of 75 ml of 17 M solutions of acetic acid is required.
B) The volume of 10 ml of 17 M solution of acetic acid is required.
What is the dilution factor?After dilution, the dilution factor indicates how much of the original stock solution remains in the whole solution. The dilution factor is usually expressed as a ratio, although it can also be represented as an exponent.
The stock solution to the part of the dilutant added or the part of the stock solution to the part of the total solution can be described by the dilution factor, which can be represented as a ratio or an exponent.
The mathematical formula can be used to calculate the volume of stock solution as:
[tex]{\displaystyle \frac{V_{diluted}}{V_{stock}} = Dilution \; \;factor[/tex]
Given the volume of the diluted solution = 750 ml
The dilution factor = 10
From the above formula: 750/V (stock) = 10
V (stock) = 750/10
V (stock) = 75 ml
Given the volume of the diluted solution = 200 ml
The dilution factor = 20
From the above formula: 200/V (stock) = 20
V (stock) = 200/20
V (stock) = 10 ml
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iii. Balance the equations for atoms O and H using H₂0 and H*. (.5 point)
the coefficient in front of H2O and so that you have an even number of oxygen
to balance H2O = H2 + O2 you will need to be sure to count all of H and O atoms on each side of the chemical
5. Practice: Turn off Show electron dot diagram. Use the Gizmo to create a neutral atom of
each of the following elements. Draw an electron dot diagram for each. When you are
finished, turn on Show electron dot diagram and check your answers.
H
He
Li
Be
B
C
N
O
F
Me
Na
Mg
Al
Si
Answer: You would put one dot for each valence electron the element has so Hydrogen would be 1 He:2 Li:1 Be:2 B:3 C:4 N:5 O:6 F:7 Ne:10
Na:1 Mg:2 Al:3 Si:4
Explanation:
This is also called the lewis structure you will draw the dots around the letter. 2 on each side and there are 4 sides per letter
Lewis diagram, or Lewis structure, is a diagram that employs dots to represent the valence electrons of such an atom. Hydrogen has 1 valence electron.
What is electron dot diagram?A Lewis electron dot diagram, also known as an electron dot diagram, Lewis diagram, or Lewis structure, is a diagram that employs dots to represent the valence electrons of such an atom. The amount of dots corresponds to the atom's valence electron count.
Chemical bonds are virtually often created by interactions between atoms' valence electrons. A straightforward technique to depict those valence electrons might be helpful to improve our comprehension of how they interact.
Element number of electron
H 1
He 2
Li 1
Be 2
Therefore, in above given way number of valence electron can be shown.
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What volume of 12 gas forms when 21 L Cl2 react at STP?
The volume of I₂ gas formed when 21 L of Cl₂ gas reacts at STP is 21 L
How do I determine the volume of I₂ gas formed?We'll begin by writing the balanced equation for the reaction. This is shown below:
2KI(aq) + Cl₂(g) -> 2KCl(aq) + I₂ (g)
From the balanced equation above,
1 L of Cl₂ reacted to produce 1 L of I₂
With the above information, we can obtain the volume of I₂ formed when 21 L of Cl₂ react at STP as follow: :
From the balanced equation above,
1 L of Cl₂ reacted to produce 1 L of I₂
Therefore
21 L of Cl₂ will also react to produce 21 L of I₂
Thus, the volume of I₂ formed is 21 L
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6. a. You perform a titration using phenolphthalein indicator to determine the concentration of an
unknown acid (HA)(aq). When titrating with 0.5 M NaOH, you find the endpoint of a 10 mL sample
of HA (aq) after 7.6 mL of NaOH is dispensed from the buret. What is the concentration of HA(aq)? (6
pt)
HA + OH A + H₂O
Answer:
Moles of NaOH = 0.5 M x 0.0076 L = 0.0038 mol
Moles of HA = 0.0038 mol
Concentration of HA = 0.0038 mol/0.01 L = 0.38 M
Write the acid-base reaction that occurs between HF and water . Identify the acid , base , conjugate acid, and conjugate base
The conjugate acid-base pairs are ( HF, F⁻) and ( H₂O, H₃O⁺ )
What is conjugate acid base pair?A conjugate acid-base pair, as defined by Bronsted-Lowry, consists of two compounds that are distinct only in that they contain a proton (H⁺). The addition of a proton to a base results in the formation of a conjugate acid, while the removal of a proton from an acid result in the formation of a conjugate base.
The reaction becomes:
HF + H₂O → H₃O⁺ + F⁻
The conjugate acid-base pairs are ( HF, F⁻) and ( H₂O, H₃O⁺ )
Here,
F⁻ to HF is conjugate acid.H₃O⁺ to H₂O is conjugate base.HF to F⁻ is conjugate base.H₂O to H₃O⁺ is conjugate acid.To know more about conjugate acid-base refer to:
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____O2 → ____O3
Type of reaction: ____
When [tex]O_2[/tex] is converted to [tex]O_3[/tex], the kind of reaction that takes place is oxidation.
What is oxidation?Oxidation is a type of reaction that can be defined in several ways. These include:
Addition of oxygenRemoval of hydrogenIncrease in oxidation numberAddition of electronegative elementsRemoval of electropositive elementsOxidation is the reverse of reduction, which can be defined as:
removal of oxygenaddition of hydrogendecrease in oxidation numberaddition of electropositive elementsremoval of electronegative elementsThe conversion of [tex]O_2[/tex] to [tex]O_3[/tex] requires the addition of oxygen. Thus, it is an oxidation reaction.
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Make the correct match.
1. Supports multiple coding of raw data
AU
2. Standard audio format supported by Windows PCs
AIFF
3. Standard audio format used by Sun, Unix, and Java
MP3
4. Most popular format when downloading music
WAV
5. Real audio
AVI
6. Standard audio file for Macs
RA
AVI: Supports various raw data coding. Microsoft Inc. created the audio visual interleave protocol, or AVI.
What is coding?Coding is defined as the practice of using computer programming languages to provide instructions to machines and computers. Computers can obey a set of instructions created through coding.
WAV: A common audio format that Windows PCs can play. It stands for Waveform Audio File Format, which was created by IBM and Microsoft Inc.
Sun, Unix, and Java all employ the standard audio format known as AU.
The most common format for music downloads is MP3.
Real audio, or RA.
AIFF: a common audio file format for Macs.
Thus, AVI: Supports various raw data coding. Microsoft Inc. created the audio visual interleave protocol, or AVI.
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