Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as Na2CO3⋅xH2O where x is the number of moles of H2O per mole of Na2CO3. When a 2.558 g sample of washing soda is heated at 25 degrees Celsius, all the water of hydration is lost, leaving 0.948 g of Na2CO3. What is the value of x?
Answers
The value of x is 10, which means that the formula of washing soda is Na2CO3⋅10H2O.
Washing soda is a hydrate with a formula of Na2CO3⋅xH2O, where x is the number of water molecules per mole of Na2CO3. To find the value of x, we can calculate the mass of water lost during heating, and then use the ratio of moles of water to moles of anhydrous Na2CO3 to determine the value of x. In this case, the value of x is 10, which means the formula for washing soda is Na2CO3⋅10H2O.
The hydrated form of sodium carbonate, washing soda, is commonly used in household cleaning and laundry products due to its ability to remove stains and soften water. It is also used in the manufacture of glass, soaps, and paper, and in the chemical industry as a source of sodium ions and carbonates.
It is important to note that washing soda is a strong base and should be handled with care. Direct contact with the skin or eyes can cause irritation, and ingestion can be harmful. It should be stored in a cool, dry place, away from other chemicals and substances that it could react with.
Learn more about washing soda: brainly.com/question/13450047
#SPJ11
Related Questions
Photosynthesis occurs in
the mitochondria
chloroplast
Answers
Write a short evaluation of the article’s reliability and scientific worth. Support your evaluation with specific examples from the article.
Answers
It is important to make sure the information is accurate whether writing a research paper, practising a speech, or working on any other project that depends on data from outside sources.
Investigate the method of determining a source's dependability, credibility, and reliability.Let us write a short evaluation on OZONE HOLE.
A large portion of the Sun's bright radiation is absorbed by the ozone layer, a shield region of the stratosphere. It has a large concentration of ozone.
It contains oxygen atoms that shield the surroundings from harmful radiation, such as brilliant beams, that are emitted by the sun and are available in space.
The ozone opening is less of a gap in the windshield and more of a dip. There is neither a uniform thinning of the ozone layer nor does the ozone disappear through it. The French physicists Charles Fabry and Henri Buisson also discovered it in 1913.
A size of 7.6 million square miles (19.7 square kilometres) was reached by the ozone opening in 2017 before it started to close. The distance increased to 8 million square miles in 2016.
Learn more about Ozone here:
https://brainly.com/question/5019112
#SPJ9
third question: 3. SEP Identify Limitations of a Model Since models are representations, they have limits on how precisely they describe reality. Consider your model. What approximations or assumptions does your model contain? How does each one limit your model’s explanatory power?
can someone please help me with this assignment, also comment on the person’s answer if you think that they’re wrong.
Answers
A model can only have a certain number of factors, and most models assume that these factors are static, which might limit how accurately a model can simulate reality.
Describe a scientific model.A scientific model is a representation of an idea, a system of ideas, or different types of processes or events that can be in the mathematical form or physical form.
Which of the following describes a drawback to model-based science?Although models are incredibly useful, they do have some drawbacks. Details—All of the information about the items that models represent cannot be included. Maps, for instance, cannot depict all the specifics of the earth's features, such as mountains, valleys, etc.
To know more about model visit:-
https://brainly.com/question/10091720
#SPJ1
How many atoms are present in a sample of Potassium (K) weighing 33.49g?
Answers
Answer:
5.158 × 10²³ atoms K
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
33.49 g K
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of K - 39.10 g/mol
Step 3: Convert
\(33.49 \ g \ K(\frac{1 \ mol \ K}{39.10 \ g \ K} )(\frac{6.022 \cdot 10^{23} \ atoms \ K}{1 \ mol \ K} )\) = 5.15797 × 10²³ atoms K
Step 4: Check
We are given 4 sig figs. Follow sig figs and round.
5.15797 × 10²³ atoms K ≈ 5.158 × 10²³ atoms K
What happens when a base dissolves?
O A. It increases the concentration of OH in solution.
O B. It increases the concentration of Hi in solution.
O C. It is no longer dangerous.
O D. It adds oxygen to the solution.
Answers
Answer:
A. It increases the concentration of OH in solution.
Explanation:
Answer:
B. It increases the concentration of Hi in solution.
Explanation:
A.p.e.x
How many grams of aluminum bromide are required to make 1.50 l of a 2.3m solution?
Answers
To make a 2.3 M solution of aluminum bromide in 1.50 L, you would need 202.5 grams of aluminum bromide.
Molarity (M) is defined as moles of solute per liter of solution. To calculate the grams of solute needed, we can use the formula:
grams of solute = molarity (M) × volume of solution (L) × molar mass (g/mol)
The molar mass of aluminum bromide (AlBr₃) can be calculated by adding the atomic masses of aluminum (Al) and bromine (Br):
Al: 26.98 g/mol
Br: 79.90 g/mol
AlBr₃: (26.98 g/mol) + 3 × (79.90 g/mol) = 266.78 g/mol
Now we can substitute the given values into the formula:
grams of solute = 2.3 M × 1.50 L × 266.78 g/mol = 724.605 g
Rounding to three significant figures, the answer is approximately 202.5 grams of aluminum bromide.
learn more about bromide here:
https://brainly.com/question/32067334
#SPJ11
How can you show using Pauli's exclusion principle that p sub shell can have only 6 electrons?
Answers
where l = subshell value.
"l"values of subshell are.
s = 0.
p = 1.
d = 2.
f = 3.
So in p orbital we have 6 electrons.
if you know the condensation point for a series of gases, how will that allow you to predict which gases would vary most from being an ideal gas
Answers
One way to predict which gases would vary most from being an ideal gas is to look at their critical temperatures and pressures. Gases that have critical temperatures and pressures that are close to their actual temperatures and pressures are more likely to deviate from ideal behavior. Additionally, gases that have strong intermolecular forces, such as hydrogen bonding or dipole-dipole interactions, are more likely to deviate from ideal behavior.
Therefore, if you know the condensation point for a series of gases, you can use this information to predict which gases are more likely to deviate from ideal behavior and which gases are more likely to behave like ideal gases.
A sample of grape juice has a hydroxide ion concentration of 1.4 × 10-10 M. Which of these equations will you use to find the hydronium ion concentration?
Answers
Explanation:
Since [H+] [OH-] =10^(-14)
[H+] = (10^-14) / (1.4×10^-10)
Write the formulas of the ionic compounds
Answers
a. MgCl₂
b. NH₄Cl
c. (NH₄)₃PO₄
d. Cu₂O
If 8.77g of potassium iodide (KI) are dissolved in sufficient water to make 4.75L of solution, what is the molarity of the solution
Answers
Answer:
0.0111mol/L
Explanation:
M = n/V
We don't know n, but we know that n =mass/Molar mass, so:
n = 8.77g/166.0028 g/mol
n = 0.0528304342mol
M = n/V
M = 0.0528304342mol/ 4.75L
M = 0.111221967mol/L
Round to three sig figs if necessary: 0.0111mol/L
The molarity of the solution is 0.010M.
Molarity:
Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
Given:
Mass=8.77g
Volume= 4.75 L
To find:
Molarity=?
Firstly we need to calculate the number of moles.
Molar mass of KI= 166 g/mol
Given mass= 8.77 g
\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} \\\\\text{Number of moles}=\frac{8.77}{166}= 0.05 \text{mol}\)
Now, substituting the values in molarity formula which is given as:
\(\text{Molarity}=\frac{n}{V} \\\\\text{Molarity}=\frac{0.05}{4.75} =0.010M\)
Therefore, the molarity of the solution is 0.010M.
Learn more:
brainly.com/question/19943363
the atomic models after dalton’s time included ideas about the atomic structure. which atomic model that shows the atomic structure is missing from this set? bohr’s model schrödinger’s model rutherford’s model thomson’s model
Answers
The atomic models after Dalton's time that included ideas about the atomic structure are Rutherford's model, Thomson's model, Bohr's model, and Schrödinger's model.
Thomson's atomic model is missing from this set.
Thomson proposed the atomic model known as the plum pudding model in the year 1904.
The atomic model shows that atoms are made up of negatively charged particles and positively charged particles that are distributed evenly throughout the atom, much like raisins in a plum pudding.
In 1911, Ernest Rutherford discovered the atomic nucleus, which is made up of positively charged particles, through his gold foil experiment.
Rutherford proposed an atomic model in which the nucleus was located at the center of the atom, surrounded by negatively charged particles, in the same year.
This model is also known as the planetary model of the atom.
In 1913, Niels Bohr proposed a new atomic model based on Rutherford's planetary model that included electron orbits.
Bohr's atomic model predicted atomic spectra for elements that were consistent with observations.
In 1926, Erwin Schrödinger proposed the quantum mechanical model of the atom, which describes electrons in terms of probability distributions rather than fixed orbits.
The electrons in this model are described as wavefunctions.
To know more about Rutherford's model visit;
https://brainly.com/question/30087408
#SPJ11
ice added to a hot soup for the purpose must be made from what type of water
Answers
When adding ice to a hot soup, it is generally recommended to use ice made from potable or drinkable water.
The water used to make the ice should be clean and free from any contaminants that could affect the taste or safety of the soup.
It is advisable to use filtered or purify water to make the ice to ensure that it is of good quality. This helps prevent any unwanted flavors or impurities from transferring to the soup.
Using tap water can also be acceptable if it meets the drinking water standards in your area and is considered safe for consumption. However, if you have concerns about the quality of your tap water, using filtered water is a safer option.
Ultimately, the goal is to add ice made from water that is safe and of good quality to avoid any negative impact on the taste or safety of the soup.
To know more about purify water here
https://brainly.com/question/13704419
#SPJ4
Omg please help me im doing so well in science i have a 100 and this if for a grade and i really need t o kkeep that 100
Answers
Answer:
b
Explanation:
This means that it takes more energy or heat to increase water's temperature than it does for most other substances. The specific heat of water is greater than that of dry soil, therefore water both absorbs and releases heat more slowly than land.
the mass of C02 contains same number of molecules as there are number of atoms in 2.3 g of sodium
Answers
1- mole of any Substance will have the same number of Molecules.
Molecular weight of CO2= 44
Molecular weight of H20= 18
So 18 g of H20 will contain the same Number of molecules as in 44 g of CO2.
Therefore 7.2 g of H2O will have same Number of Moleculesas in =7.2/18 x 44
= 17.6 g of CO2.
Use this table to answer the questions on Polymer Selection, questions 27 to 31 . What microstructure would you expect to form in polypropylene? Explain your answer.
Answers
the micro structure that would be formed by polypropylene would be a semi-crystalline structure. This is a result of how polymer chains are organized and how the substance behaves during cooling and solidification. Long chains of propylene monomer units make up polypropylene.
These chains are generated during the polymerization process and become intertwined. The molten polypropylene goes through a process known as crystallization as it cools down. The polymer chains arrange themselves into crystalline and amorphous regions in the semi-crystalline
micro structure of polypropylene. In contrast to amorphous sections, which are more randomly structured, crystalline regions are made up of tightly packed, highly ordered polymer chains. The level of crystallinity can change according on the processing circumstances, cooling rate, and molecular weight.
In polypropylene, the creation of the semi-crystalline micro structure gives the substance good mechanical qualities like stiffness, strength, and impact resistance. The amorphous portions offer flexibility and impact resistance, while the crystalline regions contribute to the material's strength.
to know more about polymerization refer to the link below
https://brainly.com/question/1602388
#SPJ4
What do you have to do to change an atom labeled + ion or - ion into a neutral atom?
Answers
Answer:
to change an atom labeled + ion or -ion into a neutral atom, an electron is either added or removed from it
What is the chemical formula for the molecule
represented by the model?
CHO
o C4H₂O₂
O C H2O
O C3H802
Answers
Answer: it’s the third one
Explanation:
How many bromide ions are there in 2.00g of MgBr2?
Answers
There are 1.31 x 1022 bromide ions in 2.00 g of \(MgBr_2\).
The chemical formula of magnesium bromide (\(MgBr_2\)) contains one magnesium ion (\(Mg2^+\)) and two bromide ions (Br-). To find the number of bromide ions in 2.00 g of \(MgBr_2\), we need to use the molar mass of \(MgBr_2\) to determine the number of moles of \(MgBr_2\) present in 2.00 g of the compound, then use the stoichiometry of the chemical formula to determine the number of bromide ions present. First, we need to calculate the molar mass of \(MgBr_2\). The molar mass of \(MgBr_2\) is equal to the sum of the atomic masses of magnesium (Mg) and two bromine (Br) atoms. The atomic mass of Mg is 24.31 g/mol, and the atomic mass of Br is 79.90 g/mol. Molar mass of \(MgBr_2\) = 24.31 g/mol + (2 x 79.90 g/mol) = 184.11 g/mol Next, we can use the molar mass to determine the number of moles of \(MgBr_2\) present in 2.00 g of the compound: Number of moles of \(MgBr_2\) = mass of \(MgBr_2\) / molar mass of \(MgBr_2\)= 2.00 g / 184.11 g/mol
= 0.0109 mol Finally, we can use the stoichiometry of the chemical formula to determine the number of bromide ions present: Number of bromide ions = 2 x number of moles of \(MgBr_2\)
= 2 x 0.0109 mol
= 0.0218 mol Therefore, there are 0.0218 moles of bromide ions in 2.00 g of \(MgBr_2\). To convert this to the number of bromide ions, we can multiply by Avogadro's number (6.02 x 1023): Number of bromide ions = 0.0218 mol x 6.02 x 1023 ions/mol = 1.31 x 1022 ions
For more questions on bromide ions
https://brainly.com/question/29228517
#SPJ8
Give the symbol of the element that meets the following conditions.
has four electrons in energy level n = 3
has four 2p electrons
completes the 4p sublevel
has four electrons in energy level n = 4
has three 2p electrons
completes the 4s sublevel
has three electrons in the 3d sublevel
completes the 3s sublevel
Answers
The elements with the corresponding letters are Carbon (C), Krypton (Kr), Calcium (Ca), and Scandium (Sc)
What is the major energy level's highest sublevel?The electrons in an atom's highest occupied main energy level are known as valence electrons. The two electrons in the 1s sublevel of second period elements are known as inner-shell electrons and are not directly involved in the reactivity of the element or the production of compounds.
What substance contains a single electron at the 3s sublevel?You are aware that the number of protons in the nucleus and electrons encircling the nucleus must be equal in a neutral sodium atom. As a result, sodium possesses one electron on its third energy level, or 3s sublevel.
To know more about elements visit:-
https://brainly.com/question/8460633
#SPJ1
2
Which represents a mixture?
*
Ос.
Answers
Explanation:
A mixture is an impure substances with the following properties:
Composition is indefinite i.e they consist of two or more elements and or compounds in any proportion by massConstituents retain their identities i.e physical properties are retainedConstituents reacts differently to changed conditions. They can easily be separated into constituents by physical methodsExamples are air, sea - water, muddy water, palm -wine, petroleum, alloys etc.
Using this description it should be easy to identify a mixture.
state the volume of sodium hydroxide
Answers
Answer:
0.0250 dm 3.
Explanation:
Volume of sodium hydroxide solution = 25.00 ÷ 1000 = 0.0250 dm 3. Amount of sodium hydroxide = 0.100 × 0.0250 = 0.00250 mol. From the equation, 0.00250 mol of NaOH reacts with 0.00250 mol of HCl
how to tell if work is done on or by the system chemistry
Answers
In chemistry, determining whether work is done on or by the system can be determined by considering the sign convention used for work in thermodynamics.
Work Done on the System:If work is done on the system, it is considered to have a positive sign convention.This typically occurs when external forces or pressure exerted on the system compresses it, reducing its volume.Examples include compressing a gas, applying pressure to a piston, or decreasing the volume of a container holding the system.2. Work Done by the System:
If work is done by the system, it is considered to have a negative sign convention.This generally occurs when the system expands or does work on its surroundings, increasing its volume.Examples include a gas expanding against external pressure, a reaction generating gas that pushes a piston, or a system doing mechanical work.To determine the sign of work, you need to consider the perspective of the system. If the system is being compressed by external forces or pressure, work is done on the system and is considered positive.
Conversely, if the system is expanding and doing work on the surroundings, work is done by the system and is considered negative. It's essential to understand the context of the system and its interactions to determine the correct sign convention for work.
Learn more about Work done by system:
brainly.com/question/13536681
#SPJ11
giving brainly if correct
Answers
Answer:
Large Cargo Ship
Explanation:
Hope it helped!
Question 14 of 30
Which of the following elements has 1 valence electron?
The Periodic Table
A. Sodium (Na)
B. Chlorine (CI)
C. Calcium (Ca)
D. Helium (He)
SUBMIT
Answers
Answer:
A. Sodium (Na)
Explanation:
The total number of electrons in the outermost principal energy level of an element is called the valence electrons of that element.
Na (11)---→1s2 2s2 2p6 3s1
There 1 electron in the outermost principal energy level of Sodium. So, the number of valence electron of Sodium is 11.
Answer:
Na
Explanation:
I was learning about it recently, that dude's right, it's Sodium
Drag each tile to the correct image.
Match each alkane name with its structure.
octane
decane
propane
butane
heptane
CHE
IGH
CHE
Reset
Next
Answers
Answer:
The first one is Propane
The second one is HEPTANE
The third one is octane
The 4th is butane
the 5th is decane
The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.
The images has been the representation of the ball and stick structure of the compounds. The central balls have been the representation of the carbon atom , with small balls attached to the sticks have been the representation of the hydrogen attached.
The following structures has been given as:
The structure has 3 carbon atoms with the presence of 8 hydrogen. The molecular formula has been \(\rm C_3H_8\). It has been the structure of propane.The structure has 7 carbon and 16 hydrogen. The structure has been the representation of heptane with molecular formula \(\rm C_7H_{16}\).The structure has molecular formula \(\rm C_8H_{18}\) with 8 carbon and 18 hydrogen. It has been named Octane, according to IUPAC.The structure with 4 carbon and 10 hydrogen with molecular formula \(\rm C_4H_{10}\) has been named according to IUPAC as butane.The structure with molecular formula \(\rm C_{10}H_{22}\) has presence of 10 carbon and 22 hydrogen. It has been named as Decane.The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.
For more information about structure of hydrocarbons, refer to the link:
https://brainly.com/question/8049265
Calculate the wavelength (in nm) of light with a frequency of 5.98 x 1014 s 1. What is the energy of a photon of light that has a frequency of 9.89 x 1013 Hz?
Answers
The wavelength of the light is approximately 500 nm. The energy of the photon of light is approximately 6.56 x 10-20 J.
Answer: Question 1:The formula relating wavelength, frequency, and the speed of light is given by:c = fλHere,λ = wavelength, f = frequency, c = speed of lightI. n the problem, frequency is given as 5.98 x 1014 s-1. Therefore, using the formula, the wavelength of light can be calculated as follows:λ = c/f= (3 x 108 m/s)/(5.98 x 1014 s-1)≈ 500 nm
Therefore, the wavelength of the light is approximately 500 nm.
Question 2:The formula relating energy and frequency of light is given by:E = hfwhereE = energy of photonh = Planck's constant = 6.626 x 10-34 J s (Joule seconds)f = frequency of lightIn the problem, the frequency of light is given as 9.89 x 1013 Hz. Therefore, using the formula, the energy of the photon of light can be calculated as follows:E = hf= (6.626 x 10-34 J s) x (9.89 x 1013 Hz)≈ 6.56 x 10-20 J
Therefore, the energy of the photon of light is approximately 6.56 x 10-20 J.
To learn more about photon visit;
https://brainly.com/question/32364752
#SPJ11
albr3 + cl = alci3 + br2. what type of reaction is that? and what are the coefficient numbers?
Answers
Which molecule has a tetrahedral arrangement of electron pairs but is not tetrahedral molecule
Answers
methane
Which molecule has a tetrahedral arrangement of electron pairs but is not a tetrahedral molecule? methane
The colour of chromium
Answers
Answer:
Chromium appears Silvery grey in color, with a highly polished surface.
When Chromium is heated it forms a green color Chromic oxide.