A new element has been added to the Periodic Table. It is most comparable to the Alkaline Earth Metals (like Calcium and Magnesium). How many electrons does it likely have in its outer shell? How can you tell?
Answers
The elements that make up group 2 of the Periodic Table are alkaline earth metals. comparable to Be, Mg, Ca, Sr, Ba, and Ra.
Electron distribution
Let's distribute two items from group 2 electronically.
Mg's atomic number is 12.
20 is Ca's atomic number.
1s2 2s2 2p6 3s2 Mg
Ca – 1s2, 2s2, 2p6, 3s2, and 4s2.
On the electrical distribution, the valence shell is marked. Both have two electrons in the valence shell, according to this.
To obtain 8 electrons in the valence shell, we must either gain or lose electrons from the ionic charge of the ion. 8 electrons in the valence shell of Mg2+, which has 1s2, 2s2, and 2p6. Therefore, the ion that alkaline earth metals create has an ionic charge of 2+.
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Related Questions
Claim, Evidence, Reasoning : It is said that early 20th-century Italian tenor Enrico Caruso could
shatter glass with his high notes.There is no evidence to confirm this claim,
but MythBusters' Jamie Hyneman and Adam Savage tested the physics
behind this claim and found that it was possible. Write a scientific
explanation that explains what happens to cause the glass to break.
Answers
Answer: It´s question of resonance
Explanation: I think in case of crystal glass it have
certain structure. There are certain frequencies crystal can vibrate.
High sound frequencies resonate, also give energy to structure vibrations and it vibrates more strongly until structure breaks up.
75% of the gases that make up the atmosphere are found below
16 kilometers
6 kilometers
10 kilometers
12 kilometers
Answers
Old man Walter wants the recipe for a chemical you invented in his chemistry class, which formula should you use so that he knows exactly what amount and which elements he needs to make it?
Structural formula
Empirical formula
The quadratic equation
Chemical/Molecular formula
Answers
The appropriate formula for Old man Walter to know the exact amount and elements needed to make the chemical is the Chemical/Molecular formula.
The Chemical/Molecular formula represents the composition of a compound in terms of the number of atoms of each element present.
This formula provides detailed information about the elements and their proportions in the compound, allowing Old man Walter to understand the exact amount of each element needed.
Structural formula, on the other hand, shows the arrangement of atoms and their bonds in the molecule but doesn't necessarily indicate the exact amounts of each element needed.
Empirical formula shows the simplest whole-number ratio of the elements in a compound but not the actual number of atoms present. The quadratic equation is unrelated to chemistry and won't be helpful in this context.
To help Old man Walter understand the exact amount and elements needed to make the chemical, you should provide him with the Chemical/Molecular formula of the compound.
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Which term describes this reaction? upper c upper h subscript 3 upper b r (a q) plus upper o upper h superscript minus (a q) right arrow upper c upper h subscript 3 upper o upper h (a q) plus upper b r superscript minus (a q). addition condensation elimination substitution
Answers
The reaction is a substitution reaction since bromide ion was replaced by hydroxide ion.
What is a chemical reaction?A chemical reaction is a change which results in a the permanent rearrangements of the atoms and constituents of a substance such that new substances are formed.
The given reaction is a as follows:
\(CH_3Br (aq) + OH^{-} (aq) \rightarrow CH_3OH (aq) + Br^{-} (aq) \\ \)
Bromide ion was replaced by hydroxide ion.
Therefore, the reaction is a substitution reaction.
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Answer: D-substitution
Other person is right its
Explanation:
Calculate molar solubility in mol/l and solubility in g/l of sodium stearate (c17h35coona) in pure water.
Answers
The molar solubility of sodium stearate in pure water is 0.00163 mol/L, and the solubility is 0.5 g/L.
To calculate the molar solubility and solubility of sodium stearate (C17H35COONA) in pure water, we need to consider the balanced equation for its dissolution and use the given molecular formula and molar mass.
First, let's write the balanced equation for the dissolution of sodium stearate in water:
C17H35COONA(s) ⇌ C17H35COO−(aq) + Na+(aq)
The molar solubility is defined as the number of moles of solute (sodium stearate) that dissolve per liter of solvent (water). To calculate it, we need to determine the concentration of the sodium stearate ions in the saturated solution.
The molecular formula of sodium stearate (C17H35COONA) indicates that for every molecule that dissolves, one C17H35COO− ion and one Na+ ion are produced. Therefore, the concentration of both ions will be the same in the saturated solution.
To find the molar solubility, we need to calculate the concentration of either the C17H35COO− ion or the Na+ ion. Let's use the C17H35COO− ion.
The molar mass of sodium stearate (C17H35COONA) is 306.44 g/mol.
Now, we can calculate the molar solubility:
Molar solubility = (mass of sodium stearate / molar mass of sodium stearate) / volume of water
Since we are working with pure water, the volume is 1 liter (1000 mL).
To find the solubility in grams per liter (g/L), we multiply the molar solubility by the molar mass of sodium stearate.
Example calculation:
If the mass of sodium stearate dissolved is 0.5 grams, the molar solubility would be:
Molar solubility = (0.5 g / 306.44 g/mol) / 1 L = 0.00163 mol/L
Solubility = 0.00163 mol/L * 306.44 g/mol = 0.5 g/L
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1.A solution has a volume of 2500 mL. How
many liters is this?
2. Convert 50 g of calcium carbonate, CaCO3,
into moles.
3. A solution contains 0.42 moles of solute in
0.75 L. Calculate the molarity of the solution.
4. What is the molarity of a solution that contains
15.0 g of NaOH per 500.0 mL of solution?
5. A 250.0 mL solution contains 4.6 g of copper
(II) chloride, CuCl2. Find the molarity of this
solution.
6. How many moles of hydrochloric acid, HCl, are
present in 0.085 L of a 3.0 M solution?
7. A 37.5 mL solution contains 0.181 g of
potassium chromate, K2CrO4. What is the
molarity?
8. What is the molarity of a solution that contains
0.85 g of ammonium nitrate, NH4NO3, dissolved
in a solution with volume 100.0 mL?
9. Calculate the mass of lead (II) nitrate, Pb(NO3)2,
necessary to make 50.0 mL of a 0.100 M solution.
10. What volume of a 0.35 M solution of sodium
chloride could be formed with 25 g of NaCl?
Answers
Answer:
2.5litres
0.0005moles
0.56M
0.75M
0.1369M
0.255moles
0.0163M
0.10625M
3.312g
1221.14cm³
Explanations
1. 25÷1000=2.5l
2.Moles=Mass÷RFM
50÷1000÷(100)
0.0005moles
3.I litre=1000cm³
0.75litres=?
750cm³
0.42moles=750cm³
?=1000cm³
0.56M
4. Molarity=Conc. in g/l÷RFM
Conc.g/l
15g=500cm³
1000cm³
30g/l
Molarity
30÷(23+16+1)
0.75M
5.4.6g=250cm³
1000cm³
18.4g/l
Molarity
18.4÷(134.446)
0.1369M
6.3moles=1000cm³
(0.085×1000)
0.255moles
7.Conc.g/l
37.5cm³=0.181g
1000cm³
4.827g/l
Molarity=4.827÷(296)
0.0163M
In an experiment to study the formation of HI (g), H2 (g+ I2(g)→ 2HI (g), H2 (g) and I2(g) were placed in a sealed container and allowed to react. on one set of axes, sketch concentration vs time curves for H2 and Hi. Explain the concept of a dynamic equilbrium.
Answers
In an experiment to study the formation of HI (g), H2 (g) + I2 (g) → 2HI (g), H2 (g) and I2 (g) were placed in a sealed container and allowed to react. On one set of axes, the concentration vs time curves for H2 and HI would look like a parabola, where the highest concentration of the reactants are at the beginning, and gradually decline as the reaction reaches equilibrium. The concept of dynamic equilibrium is that the rates of the forward and reverse reaction are equal, and the concentrations of the products and reactants remain constant.
Dynamic equilibrium is a state of a chemical system in which the rate of the forward reaction is equal to the rate of the reverse reaction. In this state, the concentrations of reactants and products remain constant over time as they continue to react with each other. The system does not appear to be changing since the forward and backward reactions occur at the same rate.
The formation of HI(g) from H2(g) and I2(g) represents a reversible reaction. Initially, the concentration of H2(g) is high and the concentration of HI(g) is zero. As the reaction proceeds, the concentration of H2(g) decreases while the concentration of HI(g) increases. Once the system reaches dynamic equilibrium, the concentration of both H2(g) and HI(g) remains constant.
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What is iupac name of this compound
Answers
Answer:
Explanation:
The lupac name of this compound is 2-Oxohexanoic acid. This compound is composed of two oxygen atoms, six carbon atoms, and one hydrogen atom. The parent chain is made up of six carbon atoms, and the functional group is a carboxylic acid group (COOH)
2. Which of the following does not have a nucleus? a. prokaryotes b. eukaryotes c. prokaryotes and eukaryotes
Answers
Answer:
Erythrocytes
Erythrocytes do not contain a nucleus. This would make answer choice "A" correct. Erythrocytes are red blood cells and these cells differ from the other cells of the body because of the absence of the nucleus. All the other cells noted have nuclei.
Explanation:
Have A Wonderful Day !!
Answer:a. Prokaryotes
Explanation:
Explain why there are different colors of visible light
Answers
Question: GoodMorning: ) ✨ Explain why there are different colors of visible light ?
Answer: WAVELENGTHS OF VISIBLE LIGHT
As the full spectrum of visible light travels through a prism, the wavelengths separate into the colors of the rainbow because each color is a different wavelength. Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.Light is made up of different wavelengths, or colors, and white light is a combination of all of them. When a ray of white sunlight hits a patch of beach ball, the paint absorbs most of the wavelengths. It reflects the rest. For example, if the patch is blue, it reflects the blue wavelengths and absorbs all the others.
Explanation: Here are the 7 from shortest to longest wavelength.
Violet - shortest wavelength, around 400-420 nanometers with highest frequency. ...
Indigo - 420 - 440 nm.
Blue - 440 - 490 nm.
Green - 490 - 570 nm.
Yellow - 570 - 585 nm.
Orange - 585 - 620 nm.
Red - longest wavelength, at around 620 - 780 nanometers with lowest frequency. Electromagnetic waves have many different wavelengths and frequencies that span a range known as the electromagnetic spectrum (Fig. 1.1). Light is a narrow range of electromagnetic waves that the eye can detect. Light of different wavelengths produces different perceptions of color.
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Suppose a solid object is fully immersed in a liquid, but B is larger than w. Is this possible at all
Answers
This problem is stating a situation in which a solid object is fully immersed in a liquid and the buoyant force is larger that its weight, so that you need to discuss whether this is possible or not.
In general terms, it is necessary to keep in mind that when the buoyant force is larger than its weight, the object will float. On the other side, when the buoyant force is smaller than the weight, then the object will sink.
It means that it could be possible to have this scenario under specific conditions. Now, the Archimedes' principle can be applied with the following version:
\(F_B+W>m_{obj}*a\\\\\rho _{fluid}*V*g+m_{obj}*g>m_{obj}*a\\\\\rho _{fluid}*V-m_{obj}>m_{obj}*a\)
It means that the object can move down the liquid if has a significant acceleration (could be external), even when the buoyant force is larger than the weight
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https://brainly.com/question/18103369https://brainly.com/question/14271593Name a substance which will undergo changes from solid to liquid to gas between 0c and 100c
Answers
Answer:
WATER
Explanation:
Water melting point 0 c boiling 100c
why don't the praticles in a solid move past one another
Answers
Answer:
Particles in a solid object are super tight and close to eachother. They do not move past eachother because it is a solid, not a liquid or gas.
Explanation:
Solid – In a solid, the attractive forces keep the particles together tightly enough so that the particles do not move past each other. Their vibration is related to their kinetic energy. In the solid the particles vibrate in place.
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Solve for missing values using the ideal gas law formula:
1. 10°C, 5. 5 L, 2 mol, __ atm. What is the atm?
2. __ °C, 8. 3 L, 5 mol, 1. 8 atm. What is the temperature in celsius?
3. 12°C, 3. 4 L, __ mol, 1. 2 atm. What is the mole?
Answers
The ideal gas law formula is used to determine the missing values in questions. When dealing with problems that require solving for missing values using the ideal gas law formula, always ensure that all values are expressed in the correct units and temperature is converted to kelvin.
The ideal gas law formula is represented as PV = nRT, where P represents pressure, V represents volume, n represents the number of moles of gas, T represents the temperature in kelvin, and R represents the universal gas constant. Solve for missing values using the ideal gas law formula:1. 10°C, 5. 5 L, 2 mol, __ atm.The temperature must be converted to kelvin first: T(K) = T(°C) + 273.15K = 10°C + 273.15 = 283.15KPV = nRT
Rearrange the equation to isolate P: P = nRT / V
Substitute the given values:
P = (2 mol)(0.0821 L•atm/mol•K)(283.15K) / 5.5 L
: P = 8.28 atm
2. __ °C, 8. 3 L, 5 mol, 1. 8 atm.The equation PV = nRT can be rearranged to T = PV / nRThe temperature must be converted to kelvin first: T(K) = T(°C) + 273.15T = PV / nR
Substitute the given values: T = (1.8 atm)(8.3 L) / (5 mol)(0.0821 L•atm/mol•K)T(K) = T +
: T = 332 K or 59°C
The temperature must be converted to kelvin first:
T(K) = T(°C) + 273.15K
= 12°C + 273.15
= 285.15
KPV = nRT
Solve for n by rearranging the equation: n = PV / RT
Substitute the given values: n = (1.2 atm)(3.4 L) / (0.0821 L•atm/mol•K)(285.15K): n = 0.141 mol
The ideal gas law formula is used to determine the missing values in questions. When dealing with problems that require solving for missing values using the ideal gas law formula, always ensure that all values are expressed in the correct units and temperature is converted to kelvin.
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cellulose is a polysaccharide (a sugar) composed of glucose monomers. it is the principal component of wood. where do the carbon atoms in cellulose come from?
Answers
1.
What do you know about how barium (Ba) behaves in real life just by looking at where it is on the periodic table? List at least 3 physical or chemical properties.
(Help would be appreciated, I wasn’t present for this lesson so the context of this question is lost on me)
Answers
Answer:
Its compounds are used by oil and gas industries to make drilling mud. Drilling mud simplifies drilling through rocks by lubricating the drill. Barium compounds are also used to make paint, bricks, tiles, glass, and rubber. Barium nitrate and chlorate give fireworks a green colour.
Concentration (M)
Reaction: G F
What does the
graph tell us about
this reaction at
equilibrium?
Time (sec)
A. The reaction is reactant favored (K<1).
B. The reaction is product favored (K>1).
C. The reaction has equal concentrations of reactants
and products.
Answers
Answer:
i think its a if not sorry i have it in a test right now
Explanation:
A heat engine has a temperature of 1800 k. some of the heat from the engine flows to the surroundings, which are at a temperature of 160 k. what is the approximate efficiency of the engine? 16% 91% 103% 109%
Answers
The efficiency of the engine is 91%.
The efficiency of the engine signifies how much heat is used and converted successfully into usable heat. It is fact that no engine can be 100% efficient because heat loss takes place in different ways during the process.
The efficiency of the engine is calculated by the formula:
Efficiency = Output heat/Input heat x 100
The temperature of heat engine is 1800 K. The temperature of the surrounding is 160 K.
Substitute the values in the above formula.
Efficiency = (1800 - 160)/1800 x 100
= 91%
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Answer:
91%
Explanation:
got it right on edge 23
What are indicators? How methyl orange and phenolphthalein changes their colour in acidic and basic solutions? How litmus paper changes its colour in different solutions?
Answers
Answer:
See the answer below
Explanation:
In chemistry, indicators are substances that are capable of changing colors with respect to the pH. Each indicator has its characteristic color in acidic pH and another characteristic color in alkaline pH.
Methyl orange indicator appears red in acidic solution and yellow in basic solutions. Phenolphthalein is usually colorless in acidic solutions and appears pink in basic solutions. A red litmus paper will turn blue in alkaline solutions while a blue litmus paper will turn red in acidic solutions.
how do you know if sp2 and sp3 carbons lie in the same plane
Answers
sp² and sp³ carbons have different geometries due to their hybridization and bonding properties. sp³ carbons are arranged in three dimensions, while sp² carbons are planar.
To determine if sp² and sp³ carbons lie in the same plane, we need to consider the hybridization and geometry of the carbon atoms involved.
1. sp² carbon: A carbon atom that is sp² hybridized has three sigma bonds and forms a trigonal planar geometry. The three sigma bonds lie in the same plane. Examples of compounds with sp² carbons include alkenes and aromatic compounds.
2. sp³ carbon: A carbon atom that is sp³ hybridized has four sigma bonds and forms a tetrahedral geometry. The four sigma bonds are arranged in a three-dimensional tetrahedral shape. Examples of compounds with sp³ carbons include alkanes and many organic molecules.
If a molecule contains both sp² and sp³ carbons, their hybridization and geometries are different. Therefore, sp² and sp³ carbons do not lie in the same plane within the molecule. The sp² carbons will be planar, while the sp³ carbons will have a three-dimensional arrangement. This distinction in geometry reflects the difference in hybridization and bonding characteristics of sp² and sp³ carbons.
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What is the name of the app needed to use the temperature probe in this investigation?
Answers
Vernier Graphical Analysis is the name of the app needed to use the temperature probe in this investigation.
Our free software is available for chrome, Windows®, macOS®, iOS®, and AndroidTM.
Collect, distribute, and analyze sensor data. You're all set to begin. Download the software without charge.
Charts, figures, and graphs are used in graphical analysis to represent data. It is especially helpful in assisting managers in processing massive amounts of data. This type of study presents a substantial amount of data in a simple style.
To illustrate both particular and generic kinematics properties, graphic analysis of motion can be used. Graphs can be utilized for several physics topics. Exploring physical interactions through graphing is crucial for finding underlying patterns.
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help I would really appreciate it tyy!!
Answers
Answer:
This image attached should help:
Explanation:
The reason that food web contains all organisms is because it shows every relationship, where food chain shows a more basic one. And the reason that they both have producers, consumers, and decomposers, is because they bothat least highlight a part of the almost every aspect, although it leans more to food web.
here's the answer to the question in the image, I couldn't comment on the right question because a bot already did.
1. ant, love
active
2. dog, man
dormant
3. bug, ring
burning
4. dress, up
pressure
5. think, tiger
trinker
5.how many electrons are exchanged in 2a? which species is oxidized and which is reduced?
Answers
In a 2A redox reaction, there are 4 electrons exchanged. The species that loses electrons is the oxidized species, and the species that gains electrons is the reduced species.
Explanation: In the given reaction, Fe is oxidized and Cr is reduced. There are six electrons exchanged in 2a.How many electrons are exchanged in 2a?In the given redox reaction,Fe2+(aq) + Cr2O72-(aq) → Fe3+(aq) + Cr3+(aq)The given reaction can be split into half reactions:Fe2+ (aq) → Fe3+ (aq) + e- (Oxidation)Cr2O72- (aq) + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(l) (Reduction)The reaction Fe2+(aq) + Cr2O72-(aq) → Fe3+(aq) + Cr3+(aq) involves the exchange of six electrons in 2a.Therefore, there are six electrons exchanged in 2a.Which species is oxidized and which is reduced?In the given reaction, Fe is oxidized and Cr is reduced.The oxidation half-reaction Fe2+ (aq) → Fe3+ (aq) + e- has Fe on both the left and right sides of the equation. As a result, the oxidation state of iron has gone from +2 to +3. Therefore, iron has lost electrons and has been oxidized.The reduction half-reaction Cr2O72- (aq) + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(l) involves the gain of electrons by chromium. As a result, the oxidation state of chromium has gone from +6 to +3. Therefore, chromium has gained electrons and has been reduced.In the given reaction, Fe is oxidized and Cr is reduced.
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PLEASE HELP
How many milligrams are there in 6.43x10^-20 centimeter of gaseous iron ii phosphate
Answers
From the calculation, we can see that the mass of the gas in milligrams is 1 * 10^-18 mg.
What is the molar volume of a gas?The molar volume of a gas is the volume that one mole of the gas occupies at a specific temperature and pressure. It can be calculated by dividing the molar mass of the gas by its density at the given temperature and pressure.
If 1 mole of the gas would occupy 22400 cm^3
x moles of the gas would occupy 6.43x10^-20 cm^3
x = 2.9 * 10^-24 moles
Now the mass is;
2.9 * 10^-24 moles = x/357 g/mol
x = 1 * 10^-21 g or 1 * 10^-18 mg
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The physical and chemical properties contribute to the function of the synthetic.products.wood
Answers
The physical and chemical properties of synthetic and natural jadeite for jewellery. The statement is correct.
What are the difference between chemical and physical property ?Chemical properties of an element can be defined as with the chemical changes where as Physical properties does not need any kind of changes.
All compounds are connected by different chemical bonds to show its chemical property while in Physical properties the compounds need to bonded to show its property.
chemical property of the element used to detect how substances react with each other and with other substances while physical property used in identify or describe the substance.
Chemical properties of a substance are Compressibility, flammability, toxicity, radioactivity where as physical properties of a substance are Molecular weight, melting point, length, color, odor, shape.
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Suppose a study measured total beer sales and number of highway deaths for 1 month in various cities. Explain why it would make sense to divide both variables by the population of the city before determining whether a relationship exists between them.
Answers
Dividing both variables by the population of the city before determining a relationship makes sense because it allows for normalization and enables a more accurate comparison between different cities.
By dividing the total beer sales and number of highway deaths by the population, we obtain per capita values that reflect the specific impact on individuals within each city. This adjustment accounts for variations in city size and ensures a fair assessment of the relationship between beer sales and highway deaths. Without normalizing the data, larger cities with higher populations would naturally have higher total sales and deaths, but it may not necessarily indicate a stronger relationship between the two variables. Normalization allows us to assess the impact relative to the population and provides a clearer understanding of any potential correlation between beer sales and highway deaths across different cities.
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I NEED HELP PLEASE!!!!
HELP!!!!!!
One of the many issues facing ecosystems is ______. During long periods of no precipitation ______ levels can drop. This can lead to ______, when the ground and rocks shift. It can also cause salt water to rush into freshwater aquifers, also known as______. Some of the effects from these ecosystems disruption can be offset by more _____ efforts.
Word Bank
Conservation
Drought
Groundwater
Land subsidence
Seawater intrusion
Answers
2) groundwater
3) land subsidence
4) seawater intrusion
5) conservation
Which element, when combined with phosphorus, would form an ionic compound?
A) Carbon.
B)Oxygen.
C)Magnesium.
D)Boron.
Answers
Explanation:
An ionic compound is a metal + a nonmetal
Since phosphorus is a nonmetal, you need a metal
Carbon is a nonmetal so it’s not carbon
Oxygen is also a nonmetal so it’s not oxygen
Boron is also a nonmetal so it’s not boron
Magnesium is a metal
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option C.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
Since phosphorus is a nonmetal, we need a metal. Out of given option the only element that is metal is Magnesium while others are non metal.
Therefore, the correct option is option C.
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can you solve this for me?
Answers
Answer:
b...............................
Answer:
b
Explanation:
can you solve this for me?
Red gold i a gold-copper alloy ued to make jewelry. A piece of jewelry made of red gold weigh 9. 21 g and ha a volume of 0. 559 cm'. Gold ha a denity of 19. 3 g/em' and copper ha a denity of 8. 96 g/cm?. Calculate the percentage by ma of each metal in the jewelry. Aume the total volume of the jewelry i the um of the volume of the two metal it contain
Answers
Red gold is a gold-copper alloy that is commonly used to make jewelry. To calculate the percentage by mass of each metal in the jewelry, you need to determine the mass of gold and copper in the jewelry. The mass of gold can be calculated using the density of gold and the volume of gold in the jewelry:
mass of gold = density of gold * volume of gold
mass of gold = 19.3 g/cm³ * 0.559 cm³
mass of gold = 10.8 g
The mass of copper can be calculated using the density of copper and the volume of copper in the jewelry:
mass of copper = density of copper * volume of copper
mass of copper = 8.96 g/cm³ * (0.559 cm³ - 0.559 cm³)
mass of copper = 0 g
The total mass of the jewelry is 10.8 g + 0 g = 10.8 g.
Therefore, the percentage by mass of gold in the jewelry is 10.8 g/10.8 g = 100%. The percentage by mass of copper in the jewelry is 0 g/10.8 g = 0%.
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