Copper has an atomic number of 29, 4 copper atoms contain 116 electrons, while 3 copper atoms can be formed from 87 protons.
The atomic number of an element tells us the number of protons in an atom of that element.
1. Since copper has an atomic number of 29, each copper atom has 29 electrons as well. To find the total number of electrons in 4 atoms of copper, we can simply multiply the number of electrons in one copper atom by 4.
So, there are 4 [tex]\times[/tex] 29 = 116 electrons in 4 atoms of copper.
2. Since each copper atom has 29 protons, we can divide the total number of protons by 29 to find the number of copper atoms that can be made.
[tex]\dfrac{87}{29} = 3[/tex]
So,87 protons can make 3 copper atoms.
Therefore, there are 116 electrons in 4 atoms of copper and 3 copper atoms can be made out of 87 protons, respectively.
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Would it make a difference if calcium bromide solution, cabr2, were used rather than sodium bromide solution?
Which combination will produce a precipitate? agno3 (aq) and ca(c2h3o2)2 (aq) naoh (aq) and hcl (aq) nacl (aq) and hc2h3o2 (aq) nh4oh (aq) and hcl (aq) fe(no3)2 (aq) and koh (aq)?
Final answer:
The combination of Fe(NO3)2 (aq) and KOH (aq) is the one that will produce a precipitate, as Fe(OH)2 is generally insoluble in water.
Explanation:
To determine which combination will produce a precipitate, we need to consider the solubility rules and look for a product in each reaction that forms an insoluble solid, known as a precipitate. We can predict precipitate formation by looking at possible products of a double displacement reaction and referencing a solubility chart.
Analysis of Combinations
AgNO3 (aq) and Ca(C2H3O2)2 (aq): No precipitate is expected because all nitrates (NO3-) and acetates (C2H3O2-) are soluble.
NaOH (aq) and HCl (aq): No precipitate forms, instead, you get NaCl (aqueous) and water (H2O).
NaCl (aq) and HC2H3O2 (aq): Again, no precipitate is expected because all chlorides (except those with Ag+, Pb2+, Hg2 2+) are soluble, as are all acetates.
NH4OH (aq) and HCl (aq): This combination results in the formation of NH4Cl (aqueous) and water, so no precipitate forms here either.
Fe(NO3)2 (aq) and KOH (aq): This combination will likely result in an insoluble hydroxide precipitate, specifically Fe(OH)2.
Based on this analysis, the combination that will produce a precipitate is Fe(NO3)2 (aq) and KOH (aq), as iron(II) hydroxide is generally insoluble in water.
The combination of B. NaOH and Fe(NO₃)₃ will produce a precipitate of Fe(OH)₃.
Other combinations either do not react or form soluble products.
To determine which combination of solutions will produce a precipitate, we can use solubility rules. Let's analyze each option:
Option A: AgNO₃ (aq) and Ca(C₂H₃O₂) (aq)Therefore, the correct answer is option B, where the reaction produces the precipitate Fe(OH)₃.
Correct question is: Which combination will produce a precipitate?
A. AgNO₃ (aq) and Ca(C₂H₃O₂) (aq)
B. NaOH (aq) and Fe(NO₃)₃ (aq)
C. NaCl (aq) and HC₂H₃O₂ (aq)
D. NH₄OH (aq) and HCl (aq)
E. NaOH (aq) and HCl (aq)
mars is 1.52 au from the sun . about how many kilometers is mars from the sun
Final answer:
Mars is approximately 227.5 million kilometers from the Sun.
Explanation:
Mars is approximately 1.52 astronomical units (AU) from the Sun. Given that the average distance between the Earth and the Sun is about 149.6 million kilometers, we can calculate the distance from Mars to the Sun. Since 1 AU is equivalent to about 149.6 million kilometers, we can multiply 1.52 AU by 149.6 million kilometers to find that Mars is approximately 227.5 million kilometers from the Sun.
Electrons have almost no mass. True False
TRUE is the perfect answer
In the periodic table of elements, what do all of the elements in group 2 have in common?
A) An atom of each element can hold up to eight electrons in its outer energy level.
B) An atom of each element can hold up to six electrons in its outer energy level.
C) Each element is an alkaline earth metal.
D) Each element is a halogen.
E) Each element is dull, brittle, and breaks easily.
Answer:
C
Explanation:
All elements in Group 2 of the periodic table are characterized as alkaline earth metals. They share the common characteristic of having two valence electrons in their outermost energy level. These elements tend to lose these electrons to reach stability, making them typically reactive.
Explanation:In the periodic table, all elements in Group 2 have some key similarities. The most significant common characteristic is that each element in this group is an alkaline earth metal. This means that they have two valence electrons in their outermost energy level. They tend to lose these two electrons to reach a stable state, so they are typically reactive.
It is incorrect to say that an atom of each element can hold up to eight or six electrons in its outer energy level. This description fits more with Group 16 and Group 18 elements, respectively. Also, these elements are not halogens (Group 17 elements), which have seven valence electrons, nor are they necessarily dull, brittle, or break easily, as these are generally more descriptive of non-metals than metals.
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Living things transform kinetic energy into potential chemical energy in the
How do the valence electron configurations of alkali metals compared with each other?
Write a balanced equation for the formation of one mole of nacl(aq) from its elements
A balanced equation for the formation of one mole of NaCl (aq) from its elements is [tex]\rm2Na + Cl_2 \rightarrow 2NaCl[/tex].
What are elements?Elements are defined as a substance that is entirely made up of the same kind of atoms, all of which have the same amount of protons in their nuclei. Every element has characteristics. Conductivity, magnetism, melting and boiling points, color, state of matter, and other characteristics are among these. The periodic table of elements is divided into sections, each of which contains groups of elements having related properties.
Balanced equation is defined as a chemical equation where the amount of each element's atoms on each side of the equation is equal and the mass is preserved. The law of conservation of mass stipulates that mass cannot be generated or destroyed, hence a chemical equation must always be in balance.
Thus, a balanced equation for the formation of one mole of NaCl (aq) from its elements is [tex]\rm2Na + Cl_2 \rightarrow 2NaCl[/tex].
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When balancing a chemical equation, the number of h atoms in 2 ch4 is eight?
What mass of precipitate will form if 1.50 L of highly concentrated Pb(ClO3)2 is mixed with 0.350 L of 0.170 M NaI? Assume the reaction goes to completion.
To calculate the mass of precipitate formed when highly concentrated Pb(ClO3)2 is mixed with 0.350 L of 0.170 M NaI, first determine the limiting reactant and use stoichiometry. Calculate the moles of Pb(ClO3)2 using its concentration and volume, then use the balanced equation to find the moles of PbI2 formed and finally calculate the mass of PbI2 using its molar mass.
Explanation:To calculate the mass of precipitate formed when highly concentrated Pb(ClO3)2 is mixed with 0.350 L of 0.170 M NaI, we need to determine the limiting reactant and use stoichiometry.
First, calculate the moles of Pb(ClO3)2 using its concentration and volume.
Moles = concentration x volume = 0.170 M x 0.350 L = 0.0595 moles
The balanced equation for the reaction is:
Pb(ClO3)2 + 2NaI -> PbI2 + 2NaClO3
From the equation, we can see that 1 mole of Pb(ClO3)2 reacts with 1 mole of PbI2.
Therefore, the mass of PbI2 formed can be calculated using its molar mass and the moles of Pb(ClO3)2.
Mass of PbI2 = moles of Pb(ClO3)2 x molar mass of PbI2 = 0.0595 moles x 461.0 g/mol = 27.44 g
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To find the number of neutrons in an atom, subtract its _____.
Explanation:
It is known that an atom consists of protons, neutrons and electrons. Both protons and neutrons are located inside the nucleus of an atom whereas electrons revolve around the nucleus.
Atomic number is the total number of protons present in an atom. On the other hand, atomic mass is the sum of total number of protons and neutrons present in an atom.
That is, Atomic mass = no. of protons + no. of neutrons
no. of neutrons = atomic mass - no. of protons
Therefore, we can conclude that to find the number of neutrons in an atom, subtract its number of protons from atomic mass.
which mineral is the major component of dryall
Magnesium metal reacts with iodine gas at high temperatures to form magnesium iodide. what mass of mgi2 can be produced from the reaction of 5.15 g mg and 50.0 g i2
To find the mass of MgI2 produced in the reaction between Mg and I2, you need to calculate the moles of Mg and I2 and use the mole ratio from the balanced equation. Finally, convert the moles of MgI2 to grams using the molar mass of MgI2.
Explanation:In this reaction, the balanced equation is 2Mg + I2 → 2MgI2. From the balanced equation, we can see that 2 moles of Mg react with 1 mole of I2 to produce 2 moles of MgI2. To find the mass of MgI2 produced, we need to calculate the moles of Mg and I2 and then use the mole ratio to determine the moles of MgI2. Finally, we can convert the moles of MgI2 to grams using the molar mass of MgI2.
Given: m(Mg) = 5.15 g, m(I2) = 50.0 g
Molar mass of MgI2 = 278.113 g/mol
Calculate the moles of Mg using the formula: moles = mass/molar massCalculate the moles of I2 using the same formulaFrom the balanced equation, the mole ratio between Mg and MgI2 is 2:2, so the moles of MgI2 will be the same as the moles of MgConvert the moles of MgI2 to grams using the formula: mass = moles x molar massUsing these steps, you can determine the mass of MgI2 that can be produced from the given masses of Mg and I2.
13. What is the difference between a solution and a heterogeneous mixture? Give an example of
each.
(4 points)
Answer:
The macroscopic appearance is different.
Explanation:
The two (solution) and heterogeneous mixture are actually mixtures. These are made up of one of two pure substances in gaseous and liquid phases.
However, the difference lies in the macroscopic level of the particles.
A heterogeneous mixture is made of different substances. For example, when powdered milk is added to water, the mixture is a white substance, or colloidal mixture. The mixture is a heterogeneous in the sense that is all liquid; however, the mixture is not the same color as water. Thus, there is not complete dissolution.
A solution is the same throughout. An example is dissolving sugar into water. The solution is colorless throughout. The difference is that the sugar and water have formed a solution whose properties are not visible to the naked eye.
The mg2+ and na+ ions each have ten electrons. which ion would you expect to have the smaller radius? explain your choice
From left to right in periodic table the atomic or ionic radius decreases. Thus, Mg is right to sodium and it is smaller than sodium.
What is atomic radius?Atomic radius is the distance from the nucleus to the valence shell containing electrons. The same can be defined for ionic radius. The elements in the periodic table are classified into different groups and periods.
Along a period the atomic radius increases and down a group the atomic or ionic radius increases. The atomic radius decreases because of the nuclear pulling to the electrons.
As the charge increases for a cation the smaller it will be. Mg2+ ions are formed by donation of two electrons from Mg and Na+ is formed by donation of one electron from it. Both are having 10 electrons.
However, the charge is higher for magnesium and it is smaller than sodium ion. Hence, ionic radius is smaller for magnesium ion.
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Final answer:
The Mg²⁺ ion is expected to be smaller than the Na⁺ ion because it has a higher effective nuclear charge and a lower principal quantum number, which results in a tighter electron shell arrangement.
Explanation:
The Mg²⁺ and Na⁺ ions each have ten electrons. The size of an ion depends on both its nuclear charge and the electron shell arrangement. In this case, the Mg²⁺ ion is expected to be smaller than the Na⁺ ion. This is because the Mg²⁺ ion has a higher effective nuclear charge than the Na⁺ ion, which causes a greater electrostatic attraction between the electrons and the nucleus, thereby pulling the electron cloud closer and resulting in a smaller ionic radius. Furthermore, the principal quantum number for Mg²⁺ is n=2, while for Na⁺ it is n=3, indicating closer and more tightly held electron shells in Mg²⁺.
Lewis is making a model of the Earth-Moon system. He knows that the diameter of the Earth is about four times greater than the diameter of the Moon. He uses a globe that is 16 inches in diameter to represent the Earth and a balloon that is blown up to be 4 inches in diameter to represent the Moon.
What property of the Earth-Moon system is best represented by this model?
A.
the materials that make up the Earth and Moon
B.
the size of the actual Earth and Moon
C.
the appearance of the Earth and Moon
D.
the relative scale of the Earth and Moon
Answer:
Option (D)
Explanation:
The relative scale is used to compare two objects or models, in terms of its scale. This enables to understand the relation between the scale of one model that is directly measurable and the other that is too large to measure. Here the direct measurable model is the globe-balloon system and the non-measurable large model is the earth-moon system.
According to the provided condition, Lewis knew that the earth's diameter is four times bigger than that of the moon. He constructed a model of its own by taking a globe of diameter 16 inches and a balloon of diameter 4 inches. He compares this globe to the earth and the balloon to the moon. His model completely satisfies the condition maintaining their relative sizes.
So the property of relative scale of earth and the moon system is appropriately shown in this model.
Thus, the correct answer is option (D).
Which of the following elements is represented by the orbital diagram?
Select one:
a. Phosphorus
b. Sulfur
c. Aluminum
d. None of these; this is an incorrect orbital diagram
What is the name for the most abundant chemical sedimentary rock? what mineral is it made of? what is the chemical formula for that mineral?
Limestone is the most prevalent type of chemical sedimentary rock. Calcite, also known as calcium carbonate, is the main component of limestone and has the chemical formula CaCO3.
What is a sedimentary rock?The formation of sedimentary rocks involves the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. The processes that lead to the accumulation of these particles are collectively referred to as sedimentation.
Clastic, organic (biological), and chemical sedimentary rocks are the three different types of sedimentary rocks. Sandstone is a type of clast sedimentary rock, which is formed from fragments of other rocks.
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Which property of isotopes makes them suitable for determining the dates of ancient artifacts? atomic number of the isotope rate of decay of the isotope radiation from the isotope stable nature of the isotope
What process uses atomic particles of carbon and uranium to determine exact age?
Answer:
Radioactive dating
Explanation:
A 50 g sample of iron reacts with 21 g of oxygen to form how many grams of iron oxide?
Final answer:
To calculate the grams of iron oxide formed, you need to calculate the moles of iron and moles of oxygen in the reaction and use the mole ratio from the balanced chemical equation. From the given information, the moles of iron and oxygen are 0.894 mol and 1.3125 mol, respectively. Using the mole ratio of 4 moles of iron to 2 moles of iron oxide, we can calculate that 0.447 mol of iron oxide is formed. Finally, converting moles to grams, we find that 71.26 g of iron oxide is produced.
Explanation:
To determine the grams of iron oxide formed, you need to calculate the moles of iron and moles of oxygen in the reaction and use the balanced chemical equation to determine the mole ratio. From the given information, the molar mass of iron is 55.845 g/mol and the molar mass of oxygen is 16.00 g/mol. The balanced chemical equation for the reaction is:
4Fe + 3O₂ → 2Fe₂O₃
Using stoichiometry, we can calculate the moles of iron and oxygen:
Moles of iron = (50 g iron) / (55.845 g/mol) = 0.894 mol
Moles of oxygen = (21 g oxygen) / (16.00 g/mol) = 1.3125 mol
From the balanced chemical equation, we can see that the mole ratio of iron to iron oxide is 4:2. Therefore, for every 4 moles of iron, we get 2 moles of iron oxide. So, the moles of iron oxide formed in the reaction is:
Moles of iron oxide = (0.894 mol iron) / (4 mol iron) * (2 mol iron oxide) = 0.447 mol iron oxide
Finally, we can calculate the grams of iron oxide:
Grams of iron oxide = (0.447 mol iron oxide) * (159.69 g/mol) = 71.26 g iron oxide
What information in the MSDS would be most important to know at the end of an experiment? the boiling point the flammability the disposal procedure the reactivity
Answer:
The correct answer is the disposal procedure.
Explanation:
As we are considering the termination of an experiment, thus, the most essential information will be the disposal procedure. Not all the substances can be disposed of as the usual materials, many chemical components need to get properly disposed of as it can influence the animals, ambiance, and even human beings.
MSDS or the Material Safety Data Sheet refers to a document, which comprises data on the potential hazards and how to handle them with caution, especially with the chemical product.
Is the ability to evaporate a physical or chemical property?
Final answer:
Evaporation as a physical property and chemical properties explained with examples and distinctions.
Explanation:
Evaporation is a physical property as it is a characteristic of a substance that can be observed or measured without changing the substance's identity. For molecules to evaporate, they must be located near the surface, moving in the right direction, and have sufficient kinetic energy to overcome intermolecular forces, which relates to physical properties.
Chemical properties, on the other hand, describe how matter changes its chemical structure or composition. An example is flammability - a material's ability to burn, which results in a chemical change, highlighting the distinction between physical and chemical properties.
In summary, physical properties are observable characteristics like color and boiling points, while chemical properties relate to changes in chemical structure and composition, such as the ability to undergo a chemical reaction or change.
An element whose atoms have the electron configurations 2-8-18-1?
The element with electron configuration 2-8-18-1 is potassium (K), which is in the first column of the s-block of the periodic table and has an atomic number of 19.
Explanation:An element whose atoms have the electron configuration 2-8-18-1 is likely a member of the alkali metals which reside in the first column of the s-block. The mentioned configuration suggests that this element has 29 electrons. Referring to the periodic table and electron configurations chart, we can determine that the element with this configuration is potassium (K), which has an atomic number of 19. Potassium typically has the electron configuration of 1s² 2s² 2p¶ 3s² 3p¶ 4s¹, which is the same as having the configuration 2-8-8-1 when considering each shell's capacity without specifying subshell orbitals.
Part
b.1. eliseo couldn't find the 6 m hcl and so used 6 m hno3 for testing the metals instead. his logic? both are strong acids. explain how the results of the experiment would have been different.
The force of gravity pulls all objects downwards." which of these statements is correct about the law of science?
a.it is not supported by observations.
b.it can be contradicted by valid data.
c.it requires no further experimentation. or
d.it it a description in nature that will continue to change.
The correct statement about the law of gravity is that it can be contradicted by valid data. Newton's law of gravitation, which has been expanded upon by Einstein's Theory of General Relativity, remains a well-tested hypothesis, and scientific laws are subject to ongoing testing and revision.
The force of gravity is a fundamental principle in physics, described by Newton's law of gravitation, which states there is a force of attraction between masses. This law is supported by copious observations and is considered a scientific law because it consistently describes what happens under certain conditions in nature.
When evaluating the statement, "The force of gravity pulls all objects downwards," the correct choice would be option b, as scientific laws can be contradicted by new, valid data, which may lead to their modification or replacement.
For instance, Albert Einstein's Theory of General Relativity provided new insights into gravity that go beyond Newton's law, particularly in extreme conditions involving massive objects like the sun. Additionally, all scientific laws, including the law of gravity, are subject to continued examination and testing; they are well-tested hypotheses rather than absolute truths. To help understand this concept, one can perform a take-home experiment by dropping objects of different masses from the same height to observe that they hit the ground simultaneously, which is a demonstration of Galileo's observation that all masses fall with the same acceleration, explained by the law of gravitation.
the waste product of photosynthesis is: carbon, oxygen, nitrogen, carbon dioxide
Which two ions will MOST LIKELY bond? A. bromine ion and iodine ion B. lithium ion and chlorine ion C. sodium ion and potassium ion D. calcium ion and magnesium ion
Final answer:
Sodium ion and potassium ion are the two ions that are most likely to bond due to their positive charges.
Explanation:
The two ions that are most likely to bond are sodium ion and potassium ion. Both sodium and potassium are alkali metals in Group 1 of the periodic table and have a single electron in their outermost energy level. When they lose this electron, they form positively charged ions (cations). Since sodium has a +1 charge and potassium has a +1 charge, these ions are attracted to each other through electrostatic forces, forming a bond.
The specific heat of water is 4.18 J/(g⋅∘
c. Calculate the molar heat capacity of water.
Answer:
The molar heat capacity of water 75.24 J/mol °C.
Explanation:
Specific heat is defined as amount of energy required to raise by the temperature of 1 g of substance by 1 degree Celsius.
Molar eat capacity as amount of energy required to raise by the temperature of 1 mole of substance by 1 degree Celsius.
Specific heat and molar heat capacities can be written:
Molar heat capacity = Specific heat × Molar mass of the substance
Specific heat of water = 4.18 J/g °C
Molar mass of water = 18 g/mol
Molar heat capacity of the water :
[tex] 4.18 J/g ^oC\times 18 g/mol= 75.24 J /mol^oC[/tex]
The molar heat capacity of water 75.24 J/mol °C.
The molar heat capacity of water that has a specific heat of 4.18 J/g°c is 75.24J/mol°C.
MOLAR HEAT CAPACITY:
The molar heat capacity of water can be calculated by multiplying the specific heat of the water by its molar mass. That is;Molar heat capacity = specific heat × molar massMolar mass of H2O = 1(2) + 16 = 18g/molMolar heat capacity = 18g/mol × 4.18 J/g°c Molar heat capacity of water = 75.24J/molTherefore, molar heat capacity of water that has a specific heat of 4.18 J/g°c is 75.24J/mol°C.Learn more at: https://brainly.com/question/2817451?referrer=searchResults
The specific heat of silver (ag) is 0.245 j/ºc g. determine the energy required to raise the temperature of 350 g of ag from 293 k to 400 k.
Specific heat equation is given as
[tex]Q =m\times c\times \Delta T[/tex]
where, Q = energy required
m = mass
c = specific heat
[tex]\Delta T[/tex] = change in temperature
Specific heat of silver ([tex]Ag[/tex]) is [tex]0.245 J/^{o}C g[/tex]
Mass of silver = 350 g
[tex]\Delta T =T_{final}-T_{intital}[/tex]
Convert 400 K to degree Celsius = 400-273 = 127 K
Convert 293 K to degree Celsius = 293-273 = 20 K
Thus, [tex]\Delta T =127 K-20 K[/tex]
= [tex]107^{o}C[/tex]
Put the values,
[tex]Q =m\times c\times \Delta T[/tex]
[tex]Q = 350 g\times 0.245 J/^{o}C g\times(107^{o}C)[/tex]
= 9175.25 J
Hence, energy required to raise the temperature is 9175.25 J