Answer:
If an element has 3 valence electrons, it means that it can form chemical bonds with other atoms by sharing or transferring those 3 valence electrons. The resulting compound will have a chemical formula and properties that depend on the specific elements involved in the bonding and the arrangement of the atoms in the compound. Some elements with 3 valence electrons include boron (B), aluminum (Al), and phosphorus (P). These elements are commonly found in compounds such as borax (Na2B4O7), alum (KAl(SO4)2), and phosphoric acid (H3PO4), respectively.
what are the 3 types of water?
Answer:
3 Types of Water: Mineral, Spring and Prepared Water
For the equation SnO2 + 2H2 Sn + 2H2O, tin (IV) oxide reacts with excess hydrogen to produce tin and water. What is the limiting reactant?
A) SnO2
B) H2
C) Sn
D) H2O
Answer:
SnO2
Explanation:
The limiting reactant is the reactant that runs out first during a chemical reaction.
Reactants are on the left side of the reaction, so SnO2 and H2. They tell us in the question that there is "excess" hydrogen (H2), so we know there is plenty of it, as "excess" means "more than enough." If we have more than enough hydrogen, then we know that we will run out of SnO2 first.
:)
Answer:SnO2
Explanation:
if the lab is cold (15° c) the melting point of acetic acid will be __________ that temperature and we will find it as a _________________.
If the lab is cold at 15°C, the melting point of acetic acid will be lower than that temperature and we will find it as a solid. Acetic acid has a melting point of 16.6°C, which means that it will remain in a solid state at 15°C.
However, if we increase the temperature, the acetic acid will eventually melt and become a liquid. It's important to note that the melting point of a substance can vary depending on the conditions, such as pressure or purity. Therefore, it's essential to control the temperature and other factors when determining the melting point of a substance accurately.
If the lab is cold at 15°C, the melting point of acetic acid, which is around 16.6°C, will be higher than that temperature. As a result, you will find acetic acid in its solid form, known as a crystalline solid, under these conditions.
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Please answer the following question using the data below: H2O vapor content: 13 grams H2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10 ∘
C 52 grams at 30 ∘
C What is the dew point for the conditions listed above? LCL 3π5 25C Relative Humidity =100%
Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$
Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$
The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.
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What is the best choice of reagents to perform the following reaction? CI COOH ? CH3OH, H2SO4 , NaCN followed by H30+ O Mg, followed by CO2, then H30+ O HCOOH, H20, heat
Chlorobenzene can be converted into benzoic acid using Grignard reagent. Thus, treating with Mg metal in dry ether followed by carboxylation and then hydrolyising the product gives benzoic acid.
What is Grignard reagent?Grignard reagents are alkyl magnesium halides with the general formula RMgX. They can be prepared by treating alkyl halides with Mg metal in presence of dry ether.
Chlorobenzene when treated with Mg gives MgCl substituted benzene ring which upon carboxylation using carbon dioxide followed by hydrolysis gives benzoic acid.
Therefore, the reagents needed for the conversion of chlorobenzene to benzoic acid are Mg, CO₂ and water.
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The equilibrium constant, Kc, for the reaction H2 (g) + 2 (g) 2H (g) is 54 at 425 ºC. If the equilibrium mixture contains 0.030 M H and 0.015 M 2 , the equilibrium concentration of H2 is______.
Answer:
[H₂] = 0.0011M
Explanation:
Based on the chemical equation:
H₂(g) + I₂(g) ⇄ 2HI(g)
And Kc is defined as:
Kc = [HI]² / [H₂] [I₂]
Where Kc = 54
And [] represents equilibrium concentration of each compund.
Replacing:
54 = [0.030M]² / [H₂] [0.015]
[H₂] = [0.030M]² / 54* [0.015]
[H₂] = 0.0011MHELP! 10 pts!! || Which does NOT describe a water molecule?
Group of answer choices
The molecule has a bent shape.
The molecule is an ionic compound.
The molecule dissolves most polar solutes.
The oxygen end of the molecule has a slightly negative charge
Answer is down below!
Explanation:
Answer and Explanation: The following is not true about water molecules: c) Water molecules form ionic bonds. Rather, water molecules form hydrogen bonds with each other due to their polarity. Water is a polar molecule, which means it has a charge difference on either end.
I need help with this question!!
Answer:
Fossil fuels..........
How did the data from the class barometer compare to the air pressure shown in the weather report?
How did the data from the class barometer compare to the air pressure shown in the weather report?
The comparison between the class barometer data and the air pressure shown in the weather report serves as a means to evaluate the accuracy and effectiveness of the barometer's measurements.
The comparison between the data from the class barometer and the air pressure shown in the weather report revealed a correlation between the two measurements. The class barometer readings were likely taken at the same time as the weather report's air pressure measurement to ensure accurate comparison.
If the class barometer readings closely matched the air pressure indicated in the weather report, it would suggest that the barometer was functioning correctly and providing reliable measurements. This would indicate that the class barometer could be used as a reliable tool for monitoring air pressure changes.
However, if there were significant discrepancies between the class barometer readings and the air pressure reported in the weather report, it could indicate a calibration issue with the barometer or potential inaccuracies in its measurements. In such a case, it would be necessary to investigate the reasons behind the discrepancies and determine the reliability of the class barometer for future use. It helps to determine the barometer's reliability as a tool for monitoring air pressure changes in the local environment.
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49. Carry out the indicated temperature conversions.
40 °C to Fahrenheit degrees
b. -40 °F to Celsius degrees
c. 232 K to Celsius degrees
d. 232 K to Fahrenheit degrees
Answer:
sorry but dorks dont learn maths
Explanation:
just kidding no offense but i think umm 1st one will stay same
i searched google
Egyptian papyrus with 63% of its original carbon-14 atoms what is the age year
Answer:
help me
Explanation:
plz
Write the formula: carbon hexabromide
Answer: C2Br6
Explanation:
the superscript preceding each hydrogen atomic symbol (h) represents what?
The superscript preceding each hydrogen atomic symbol (h) represents the mass number.
The mass number is the total number of protons and neutrons in the nucleus of an atom. It is represented by the superscript preceding the atomic symbol of an element. In the case of hydrogen (H), hydrogen atoms can have different mass numbers due to the presence of different numbers of neutrons.
For example, the most common isotope of hydrogen, known as protium, has a mass number of 1. It is denoted as ¹H. Deuterium, another isotope of hydrogen with one neutron in addition to one proton, has a mass number of 2 and is represented as ²H. Tritium, which contains two neutrons and one proton, has a mass number of 3 and is denoted as ³H.
The superscript preceding the atomic symbol provides information about the specific isotope of the element and allows distinguishing between isotopes with different numbers of neutrons.
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The amino acid Prolinehas a pk1 of 1.99, pk2 of 10.60. The amino acid Serine has pk1 of 2.21 and a of pk2 of 9.15. If these two amino acids bind together by peptide bond creating the peptide sequence Pro-Ser . What will be the overall charge of this peptide at the physiological pH of 7?
a) overall charge will be neutral
b) overall charge will be neutral on Pro and negatively charged on the Ser
c) overall charge will be negative
d) overall charge will be positive due to the presence of the peptide bond
Answer:
a) overall charge will be neutral.
Explanation:
The Ph value for Pro will be neutral and neutral charge on the Ser. Molecules of atoms generally have neutral electrical charge. If the overall charge of a peptide is negative then it is considered as negative. Pro and Ser amino acids have neutral Ph values.
What happens to the atomic radius when an electron is gained?
OA. The negative ionic radius is larger than the neutral atomic radius
B. The negative ionic radius is smaller than the neutral atomic radi
C. The negative ionic radius is the same size as the neutral atomic
radius.
D. The negative ionic radius does not follow a trend with the neutra
radius.
444 joules into calories
Answer:
106.119 calories
Explanation:
Hope this helps! If you need a step-by-step explanation feel free to ask and I'd be happy to give it to you <33
A solution initially has a [Ca2+] = 0.100 M and [Ba2+] = 0.100 M Sulfate ion (SO42-) is being added to selectively precipitate out the Ba2+ ions and leave behind the Ca2+ ions. (The barium ions will start to precipitate out first because barium sulfate is less soluble than calcium sulfate.) BaSO4 Ksp = 1.07 x 10-10 CaSO4 Ksp = 7.10 x 10-5 Assume that somehow the sulfate ion is being added in a manner that does not change the volume of the solution significantly.
a) At what concentration of sulfate ion would the Ca2+ begin to precipitate out as calcium sulfate?
b) At that concentration of sulfate ion what would be the concentration of Ba2+ ion?
The concentration of sulfate ion would be required for Ca⁺ to begin to precipitate out as calcium sulfate is 7.10 * 10⁻⁴ M.
b) The concentration of the Ba²⁺ ion would be 9.929 * 10⁻² M
What concentration of sulfate ion would be required for Ca⁺ to begin to precipitate out as calcium sulfate?The precipitation of calcium sulfate occurs when the ionic product, Kip is greater than or equal to the solubility product, Ksp of calcium sulfate.
Kip ≥ Kspa) The equation of the dissociation of CaSO₄ is given below:
CaSO₄ ⇄ Ca²⁺ + SO₄²⁻
Ksp = [Ca²⁺] * [SO₄²⁻] = 7.10 * 10⁻⁵
Kip = [Ca²⁺] * [SO₄²⁻]
[SO₄²⁻] = Kip/[Ca²⁺]
[Ca²⁺] = 0.100 M
For precipitation to occur;
Kip = Ksp = 7.10 * 10⁻⁵
[SO₄²⁻] = 7.10 * 10⁻⁵/0.100
[SO₄²⁻] = 7.10 * 10⁻⁴ M
Therefore, the concentration of sulfate ion would be required for Ca⁺ to begin to precipitate out as calcium sulfate is 7.10 * 10⁻⁴ M.
b) The concentration of the Ba²⁺ ion would be;
0.100 M - 7.10 * 10⁻⁴ M = 9.929 * 10⁻² M
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Calculate the volume percentage of phase present in an alloy of
16% by weight silicon and 84% by weight aluminium. Given density of
Si = 2.35 gm/cc and density of aluminium = 2.7 gm/cc
The volume percentage of silicon in the alloy is approximately 38.2%.
To calculate the volume percentage of silicon in the alloy, we need to consider the weight percentage and the densities of silicon and aluminium.
First, we calculate the volume of each component in the alloy based on their weight percentages. Since the density is defined as mass per unit volume, we can use the weight percentage to determine the mass of each component. For example, in 100 grams of the alloy, we have 16 grams of silicon and 84 grams of aluminium.
Next, we calculate the volume of silicon and aluminium by dividing their respective masses by their densities. Using the density of silicon (2.35 gm/cc), we find that the volume of silicon is approximately 6.81 cc. Similarly, using the density of aluminium (2.7 gm/cc), we find that the volume of aluminium is approximately 31.11 cc.
Finally, we calculate the volume percentage of silicon in the alloy by dividing the volume of silicon by the total volume of the alloy (sum of the volumes of silicon and aluminium) and multiplying by 100. In this case, the volume percentage of silicon in the alloy is approximately 38.2%.
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2. True or False: Liquid carbon dioxide changes from the liquid to the gas
phase through a process called sublimation at room temperature. This is
an example of a physical change.
Answer:
true
Explanation:
its going through a physical change beings that its compound never changes chemically.
Answer: I believe False
Explanation:
Sublimation occurs when a substance changes directly from the solid phase to the gas phase without passing through the intermediate liquid phase But the physical change part is correct though
I hope that helped in some way :)
El volumen de un gas en un recipiente cerrado es de 3.5 litros a una temperatura de 25oC y una atmósfera constante de presión. ¿ Cuál es el volumen del gas en el recipiente si se disminuye la temperatura a 7oC?
Answer:
El volumen del gas en el recipiente es 3.29 L si se disminuye la temperatura a 7°C
Explanation:
La Ley de Charles es una ley de los gases que relaciona el volumen y la temperatura de una cierta cantidad de gas a presión constante.
Esta ley establece que el volumen es directamente proporcional a la temperatura del gas. Es decir que si la temperatura aumenta, el volumen del gas aumenta, mientras que si la temperatura del gas disminuye, el volumen disminuye.
Matemáticamente, si la cantidad de gas y la presión permanecen constantes, el cociente entre el volumen y la temperatura siempre tiene el mismo valor:
\(\frac{V}{T}=k\)
Suponiendo un cierto volumen de gas V1 que se encuentra a una temperatura T1 al comienzo del experimento, al variar el volumen de gas hasta un nuevo valor V2, entonces la temperatura cambiará a T2, y se cumplirá:
\(\frac{V1}{T1}=\frac{V2}{T2}\)
En este caso, sabes:
V1= 3.5 LT1= 25 °C=298 °K (siendo 0°C=273°K)V2=?T2=7 °C=280 °KReemplazando:
\(\frac{3.5 L}{298 K}=\frac{V2}{280 K}\)
Y resolviendo obtienes:
\(V2=280 K*\frac{3.5 L}{298 K}\)
V2= 3.29 L
El volumen del gas en el recipiente es 3.29 L si se disminuye la temperatura a 7°C
Molecules are always in motion. True False
Answer: FALSE
Explanation:
Type your response in the box.
Deforestation is the act of destroying forests so the land can be used for other purposes. Do you think deforestation
increases, decreases, or has no effect on the biodiversity of the forest ecosystem?
which mountain has the second lowest elevation?
Mt. Whitney has the second lowest elevation .
What is low elevation means ?Low altitude means any elevation equal to or less than 1219 meters
(4000feet) .
Mt. Whitney is located at the southeastern end of the Sierra Nevada. It is only 85 miles northwest from badwater Basin in death valley,which at 86 meters below at sea level is the lowest point in all North America.
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The lattice constant of Ge at room temperature is a=5.65×10 −8 cm. Detcrmine the number of Ge atoms /cm 3 . B. Calculate the distance from the center of one Germanium atom to the center of its nearest neighbor. C. The density of valence electrons /cm ∧ 3
A. The number of Ge atoms/cm is 5.54 × 10²⁴.
B. The distance from the centre of one Germanium atom to the centre of its nearest neighbour is 2.825 × 10⁻⁸cm.
C. The density of valence electrons /cm³ is 7.07 × 10⁷.
To determine the number of Germanium (Ge) atoms per cm³, we can use the lattice constant and the assumption that the Ge crystal structure forms a simple cubic lattice.
a. The volume of the unit cell in a simple cubic lattice is given by the cube of the lattice constant:
Volume of unit cell = a³ = (5.65 × 10⁻⁸ cm)³
a³ = 180.36 × 10⁻²⁷
Since each unit cell contains one Ge atom, the number of Ge atoms per cm³ is equal to the reciprocal of the volume of the unit cell:
Number of Ge atoms/cm³ = 1 / (a³ = 1 / [(5.65 × 10⁻⁸ cm)³]
= 0.00554447 × 10²⁷
= 5.54 × 10²⁴
b. The distance from the centre of one Ge atom to the centre of its nearest neighbour can be determined by considering the arrangement of atoms in the simple cubic lattice. In this case, each Ge atom has six nearest neighbours, located at the corners of a cube surrounding the central atom.
The distance from the centre of one atom to the centre of its nearest neighbour is equal to half the length of the edge of the cube:
Distance to nearest neighbor = a / 2 = (5.65 × 10⁻⁸ cm) / 2
= 2.825 × 10⁻⁸cm
c. The density of valence electrons per cm³ can be calculated by multiplying the number of Ge atoms per cm (determined in part a) by the number of valence electrons per Ge atom. Germanium has four valence electrons.
The density of valence electrons/cm³ = Number of Ge atoms/cm³ × Number of valence electrons per Ge atom
Density of valence electrons/cm³ = (1 / [(5.65 × 10⁻⁸ cm)³]) × 4
= 7.07 × 10⁷
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What are the three atomic particles found in an atom, and what are their charges?
Answer:
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).Give at least 10 beneficial effects of separate mixture
Separation of mixtures is the process of isolating and purifying individual components from a mixture. It has a wide range of applications in various fields, including chemistry, biology, and environmental science. Here are ten beneficial effects of separation of mixtures:
Helps to obtain pure substances: Separation of mixtures helps in obtaining pure substances, which are essential for research and industrial processes.
Enables identification of individual components: Separation of mixtures allows the identification and characterization of individual components in a mixture.
Allows the removal of impurities: Separation of mixtures can be used to remove impurities from a mixture, which can improve the quality of the final product.
Facilitates recycling: Separation of mixtures is crucial for recycling materials such as plastic, paper, and metals.
Enables selective extraction: Separation of mixtures can be used to selectively extract specific components from a mixture.
Helps in drug development: Separation of mixtures is important in drug development, where pure compounds are required for testing and clinical trials.
Helps in forensic analysis: Separation of mixtures is used in forensic analysis to identify and analyze evidence.
Facilitates food processing: Separation of mixtures is used in the food industry to extract and purify ingredients.
Enables the production of clean energy: Separation of mixtures is used in the production of clean energy, such as separating hydrogen from other gases.
Helps in environmental remediation: Separation of mixtures is used in environmental remediation to separate and remove pollutants from soil, water, and air.
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What are the possible stress or disturbances for chemical reactions
Give the oxidation number of bromine in the following: (a) CBr4 (b) BrF5 (c) KBr (d) HBrO
For the compounds, the oxidation states are;
1) The oxidation number of bromine (Br) in\(CBr_{4}\) is -1.
2) The oxidation number of bromine (Br) in \(BrF_{5}\)is +5.
3) The oxidation number of bromine (Br) in KBr is -1.
4) The oxidation number of bromine (Br) in HBrO is +1.
What is the oxidation state?The assumption that the oxidation numbers of all the atoms in a compound add up to zero is based on the principle of charge balance, where the sum of positive and negative charges should cancel out to maintain overall neutrality in the compound.
1) Since carbon (C) in\(CBr_{4}\)has an oxidation number of +4, it is less electronegative than bromine (Br).
2) In Br\(F_{5}\), fluorine (F) has an oxidation number of -1 because it is more electronegative than bromine (Br).
3) The oxidation number of bromine (Br) in KBr is -1. This is because the bromine atom accepts an electron
4) The oxidation number of bromine (Br) in HBrO is +1. This is from the sum of the oxidation numbers of each element.
Note that we arrived at the values that we have quoted here by assuming that the oxidation number of all the atoms in the compound would add up to zero.
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2. 1 byte equals 8 bits, 1 kilobyte equals 1,024 bytes, and 1 byte equals 2 nibbles.
a. How many kilobytes is 36 nibbles?
b. How many bits is 48 nibbles?
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Angelas favorite bike begins to rust. The rust is an example of which of the following
Answer:
Chemical change
Explanation:
Usually when something is left for a while unused and not cared for it begins to have a chemical change and this chemical change shows rust.