The model below shows an atom of an element.
What is the atomic number of this atom?
6
8
9
16
The atomic number of the atom represent by the model is
8 (answer B)
Explanation.
The atomic number of atom is 8 because the model below has a total number of 8 electrons.
that is; 2 electrons in the inner energy level and 6 electrons in the outermost energy level which make a total of 2+6= 8 electrons
Answer: The the atomic number of this atom is 8.
Explanation: The particles with zero charge represents neutrons, The particles with negative charge represents electrons and the particles with positive charge represents protons.
The number of particles with negative charge are eight in number, thus there are eight electrons. The number of particles with positive charge are eight in number, thus there are eight protons. Thus it is a neutral atom.
The number of electrons represent the atomic number for a neutral atom. Thus the element has atomic number of 8.
Help please.
Which mass of urea, CO(NH2)2, contains the same mass of nitrogen as 101.1 g of potassium nitrate?
A 22g B 30g C 44g D 60g
As the oceans expand the gulf coast loses land area at what rate
Increase along the Gulf Coast and climate change at sea level. Warming ocean waters expand as temperatures rise, while mountain glaciers and inland ice melt.
What is climate ?Climate is a region's averaged long-term weather pattern over a period of time, usually 30 years. More precisely, it is the average and variation of climatic variables over a period of time that can range from a few months to many millions of years.
The average of the weather is the climate. As an illustration, you can anticipate snow in the Northeast in January or hot and muggy weather in the Southeast in July. Climate is this.
Nearly every element of our life is impacted by the climate, including our food supplies, transportation systems, clothing choices, and vacation destinations. It significantly affects our future, our health, and our means of subsistence. The long-term pattern of the weather in any given location is called the climate.
Thus, increase along the Gulf Coast and climate change at sea level.
To learn more about climate, follow the link;
https://brainly.com/question/10440860
#SPJ2
The Gulf Coast and similar regions are experiencing land loss due to sea level rise resulting from melting glaciers and ice sheets.
The loss of land area on the Gulf Coast as oceans expand is primarily a result of sea level rise and coastal erosion. As glaciers and ice sheets melt, including those in Greenland and West Antarctica, sea levels rise at an approximate rate of 3 millimeters per year, contributing to land loss along coastlines. The problem is exacerbated along the Atlantic coast by factors such as low elevations and subsiding land. The coastline from Florida to New York, for example, lost more land than it gained between 1996 and 2011, indicating a negative net change in land area.
Moreover, global assessments reveal that roughly 70% of the world's sandy shorelines are retreating, with a significant proportion of beaches eroding at rates that exceed 0.5 meters per year. Specifically, for every 361 gigatonnes per year of ice mass melting into the ocean, sea levels rise by approximately 1 millimeter. Glaciologists project that if current trends continue, we could see more than 1 meter of sea level rise by 2100, considering both melting land ice and thermal expansion of the ocean water.
The percent composition by mass of nitrogen in NH4OH(gram formula mass= 35 grams/mole) is equal to which of the following? A.4/35×100. B.14/35×100 C.35/14×100 D.35/4×100
The correct option is B: 14/35 × 100.
To determine the percent composition by mass of nitrogen in NH₄OH, we need to use the molar mass of each constituent element and the total formula mass:
Molecular weight of Nitrogen (N): 14 g/molTotal molecular weight of NH₄OH: 35 g/molThe percent composition by mass of nitrogen is calculated as follows:(Mass of Nitrogen / Molar Mass of NH₄OH) × 100
Using the given values:
(14 g/mol / 35 g/mol) × 100 = 40%
Thus, the correct option is B: 14/35 × 100.
Which of the following is the most acidic: HBrO3, HFO3, HIO3, and HClO3?
The acidity of the given compounds is determined by how readily they donate H+ ions. By considering their respective positions on the periodic table, it can be inferred that HIO3, iodic acid, is the most acidic as it disperses the resultant negative charge over the largest volume.
Explanation:The acidity of these chemicals is determined by the strength of the acid, which is determined by the degree to which the acid dissociates in water. In this case, we are looking at a series of oxyacids where the central atom is a halogen: HBrO3 (bromic acid), HClO3 (chloric acid), HFO3 (fluoric acid/supposed to be HF which is hydrofluoric acid), and HIO3 (iodic acid).
Bromic acid, HBrO3, can donate a BrO3- ion and 1 H+ ion, which makes it an acid. Similarly, Chloric acid, HClO3, donates a ClO3- ion and 1 H+ ion. Hydrofluoric acid, HF can donate F- and H+ ions, and Iodic acid, HIO3, donates IO3- and H+ ions.
By noting the position of the halogens on the periodic table, we see that iodine is further down the halogen group than the others. As you go down the group in the periodic table, the atomic radius increases. As such, the resulting negative charge on the larger ions is dispersed over a larger volume, and the acidic strength increases. Because of these, HIO3, iodic acid, is the most acidic of the acids provided.
Learn more about Acidity here:https://brainly.com/question/31840665
How can both a celsius scale thermometer and a kelvin scale thermometer indicate the same temperature change but not the same final temperature reading?
23 POINTS PLZ HELP HURRY BEING TIMED FASTS ONE TO ANSWER GET BRAINLY!!
panda population are adopted to live in which kind of habitat/
A. Rain forest
B. Cherry Forest
C. Bamboo forest
D. Ginkgo forest
How many grams of Mg2N2 can be produced from 50 grams of Mg
The half-life of tritium, or hydrogen-3, is 12.32 years. After about 37 years, how much of a sample of tritium will remain unchanged?
A)1/8 B)1/4 C)1/3 D)1/2
The correct option is A) 1/8
half-life of tritium, or hydrogen-3, is 12.32 years.
After about 37 years,
= 37/12.32
= 3
means 3 half lives.
sample of tritium that will remain unchanged will be:
= 1/2^no.of half lives
= 1/2³
= 1/2 x 1/2 x 1/2 = 1/8
1/8 remains back
45.0g of Silver (0.23 J/goc) was mixed in a beaker with 18.0g of water (4.18 J/g°C) with an initial temperature of 22.0°C. The final temperature was found to be 51.0°C. What was the change in temperature of the silver?
What is element 115, where did it came from, and what is it used for?
Given the data in the table below, δh°rxn for the reaction ag2o (s) + h2s (g) → ag2s (s) + h2o (l) is ________ kj. substance δh∘f(kj/mol) ag2o (s) -31.0 ag2s (s) -32.6 h2s (g) -20.6 h2o (l) -286
what is the name of LiNO3?
Lithium nitrate
Lithium (I) nitrogen
Lithium (I) nitrate
Lithium (I) nitride
Explain how an increase in the amount of dissolved co2 in ocean water results in a decrease in the ph of ocean water.
An increase in dissolved CO₂ in ocean water results in an increase in acidity (decrease in pH) of the water. This is due to the formation of carbonic acid that dissociates into hydrogen ions. This process has adverse effects on marine life, particularly animals such as corals and shellfish that rely on calcification to build their shells and skeletons.
Explanation:When carbon dioxide (CO₂) dissolves in the ocean water, it reacts with water to form a weak acid called carbonic acid. This acid then dissociates to form hydrogen ions (H+) and bicarbonate ions (HCO3-). Increased concentration of these hydrogen ions decreases the pH of the water, thus increasing its acidity.
Ocean acidification is detrimental to many marine organisms, especially corals and shellfish. This is because more acidic water interferes with the process of calcification, which they use to build their calcium carbonate shells and skeletons.
The increasing levels of atmospheric CO₂ and rising ocean temperatures are contributing to the acidity of ocean waters, causing harm to marine animals and ecosystems in the process.
Learn more about Ocean Acidification here:https://brainly.com/question/33970463
#SPJ3
which of the following is not a common hydrate
a epsom salt
b borax
c sugar
d alum
i belive the answer is sugar
how many grams of silver chloride (AgCI) can be produced if you start with 4.62 grams of barium chloride (BaCI2)
The chemical equation representing the reaction of silver nitrate with barium chloride:
[tex] 2AgNO_{3}(aq) + BaCl_{2}(aq)--> 2AgCl (s) + Ba(NO_{3})_{2}(aq) [/tex]
Given mass of barium chloride = 4.62 g
Moles of [tex] BaCl_{2} = 4.62 g BaCl_{2}*\frac{1 mol BaCl_{2}}{208.23 g BaCl_{2}} = 0.0222 mol BaCl_{2} [/tex]
Moles of AgCl = [tex] 0.0222 mol BaCl_{2} * \frac{2 mol AgCl}{1 mol BaCl_{2}} [/tex] = 0.0444 mol AgCl
Mass of AgCl = [tex] 0.0444 mol AgCl * \frac{143.32 g AgCl}{1 mol AgCl} = 6.36 g AgCl [/tex]
why is baking soda an ionic bond
Which units represent destiny? Select all that apply.
A. cm3
B. g/m3
C. g/cm3
D. cm3/gm
E. kg/L
F. kg/cm3
G. mL/cm3
Which must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon
monoxide gas, CO?
a)the mass
b)the volume
c)the number of molecules
d)the number of oxygen atoms
Answer : The correct option is, (C)the number of molecules
Explanation :
When we are comparing 1 mole of oxygen gas [tex](O_2)[/tex] with 1 mole of carbon monoxide gas [tex](CO)[/tex] then we conclude that,
In 1 mole of oxygen gas [tex](O_2)[/tex], there are two number of molecules of oxygen.
In 1 mole of carbon monoxide gas [tex](CO)[/tex], there are two number of molecules (carbon and oxygen).
Hence, the number of molecules must be the same when comparing 1 mole of oxygen gas, with 1 mole of carbon monoxide gas.
A compound is 69.9% iron and 30.1% oxygen by mass. how much iron could by obtained from 5.41 grams of the compound?
Final answer:
To find the amount of iron that could be obtained from 5.41 grams of a compound that is 69.9% iron, multiply the mass of the compound by the percentage of iron (in decimal form) to get 3.78 grams of iron.
Explanation:
To determine how much iron can be obtained from 5.41 grams of the compound, we use the given percentage composition of iron in the compound, which is 69.9%. We can calculate the mass of iron in the given mass of the compound by multiplying the total mass of the compound by the percentage of iron in decimal form.
To find the mass of iron in 5.41 grams of the compound: (percentage of iron / 100) × total mass of compound = (69.9 / 100) × 5.41 grams = 3.78 grams
Therefore, 3.78 grams of iron could be obtained from 5.41 grams of the compound.
please help!!
The concentration of sodium hydroxide is 1.0 M and the concentration of crystal violet is 1.00E-5 M. identify the limiting reagent and calculate how much of the excess reagent remains after the reaction runs to completion.,
In a chemical reaction, the limiting reagent is the chemical being used up while the excess reactant is the chemical left after the reaction process.
Before calculating the limiting and excess reactant, it is important to balance the equation first by stoichiometry.
C25N3H30Cl + NaOH = C25N3H30OH + NaCl
Since the reaction is already balanced, we can now identify which is the limiting and excess reagent.
First, we need to determine the number of moles of each chemical in the equation. This is crucial for determining the limiting and excess reagent.
Assuming that there is the same amount of solution X for each reactant
1.0 M NaOH ( X ) = 1.0 moles NaOH
1.00 x 10-5 M C25N3H30Cl ( X ) = 1.00 x 10-5 moles C25N3H30Cl
The result showed that the crystal violet has lesser amount than NaOH. Thus, the limiting reactant in this chemical reaction is crystal violet and the excess reactant is NaOH.
To identify the limiting reagent between sodium hydroxide and crystal violet, normally one would need the reaction equation and stoichiometry. Assuming a hypothetical 1:1 reaction, crystal violet would be the limiting reagent due to its much lower concentration compared to NaOH.
Explanation:The question asks to identify the limiting reagent in a reaction between sodium hydroxide and crystal violet and calculate the amount of excess reagent remaining after the reaction is complete. Since the concentration of sodium hydroxide (NaOH) is 1.0 M and the concentration of crystal violet is 1.00E-5 M, we do not have the actual reaction equation or the stoichiometry to determine the limiting reagent directly. Normally, the limiting reagent is the one that will be completely consumed first during the reaction, based on the stoichiometry of the reaction. Typically, the number of moles of each reagent would be considered; the one with the fewer moles, per the reaction stoichiometry, would be the limiting reagent.
As an example, if the reaction were 1:1, then clearly crystal violet would be the limiting reagent due to its much lower concentration. To find out how much NaOH remains, we would subtract the moles of NaOH that reacted with crystal violet from the initial moles of NaOH. However, in absence of the reaction equation and assuming a hypothetical 1:1 reaction, all of the crystal violet would react, leaving behind an excess of NaOH. If we had information on the volumes used, we could calculate the actual amount of NaOH remaining using dimensional analysis as demonstrated by various examples provided.
A compound containing nitrogen and oxygen is decomposed in the laboratory and produces 1.78 g of nitrogen and 4.05 g of oxygen, calculate empirical formula
The empirical formula for the compound decomposed in the laboratory which resulted in 1.78 g of Nitrogen and 4.05 g of Oxygen can be calculated by finding the moles of each element and comparing ratios. Based on the calculation, the empirical formula for the compound is NO2.
Explanation:First, we determine the number of moles of each element involved in the compound. Recall the atomic weight of Nitrogen (N) is about 14 g/mol and Oxygen (O) is about 16 g/mol.
The given weight of Nitrogen is 1.78 g. So, divide this by the atomic weight to get the number of moles: 1.78 g N / 14 g/mol = 0.127 moles of Nitrogen. Similarly for Oxygen, we have 4.05 g so: 4.05 g O / 16 g/mol = 0.253 moles of Oxygen.
To find the empirical formula, we divide each of these by the smallest number of moles, which is for Nitrogen: 0.127/0.127 = 1 for Nitrogen, and 0.253/0.127 = 2 for Oxygen. Hence, the empirical formula for the compound is N1O2 or simply NO2.
Learn more about Empirical Formula here:https://brainly.com/question/32125056
#SPJ12
The empirical formula of the compound is N1O2.
Explanation:To determine the empirical formula of the compound, we need to find the ratio of nitrogen to oxygen. The given data states that 1.78 g of nitrogen and 4.05 g of oxygen were produced. First, convert the mass of each element to moles using their molar masses. The molar mass of nitrogen is 14 g/mol, so 1.78 g of nitrogen is equal to 0.127 moles. The molar mass of oxygen is 16 g/mol, so 4.05 g of oxygen is equal to 0.253 moles. Next, divide each mole value by the smallest mole value to get the mole ratio. In this case, the ratio is approximately 1:2. Therefore, the empirical formula of the compound is N1O2.
Learn more about Empirical formula here:https://brainly.com/question/32125056
#SPJ11
On a mission to a newly discovered planet, an astronaut finds copper abundances of 69.15 % for 63cu and 30.85 % for 65cu. what is the atomic mass of copper for this location? the mass of 63cu is 62.9300 amu . the mass of 65cu is 64.9200 amu .
The relative atomic mass of copper on a newly discovered planet is [tex]\boxed{63.54{\text{ amu}}}[/tex] .
Further explanation:
An atom is also written as [tex]_{\text{Z}}^{\text{A}}{\text{X}}[/tex] , where A is the atomic mass or mass number, Z is the atomic number, and X is the letter symbol of the element.
Isotopes:
Atoms of the same element with same value of atomic number but different value of mass numbers are called isotopes. Isotopes generally have the same number of protons but the number of neutrons is different.
[tex]_{\mathbf{6}}^{{\mathbf{11}}}{\mathbf{C}}[/tex] and [tex]_{\mathbf{6}}^{{\mathbf{12}}}{\mathbf{C}}[/tex] are examples of isotopes. Both are the atoms of the same element carbon. The mass number of [tex]_{\mathbf{6}}^{{\mathbf{11}}}{\mathbf{C}}[/tex] is 11 while that of [tex]_{\mathbf{6}}^{{\mathbf{12}}}{\mathbf{C}}[/tex] is 12. But both of these have the same atomic number, i.e, 6.
Relative Atomic Mass:
It is defined as the average mass of an atom of the element compared to 1/12th of the mass of carbon-12 atom. It is represented by [tex]{{\text{A}}_{\text{r}}}[/tex] . The formula to calculate the relative atomic mass of an element is as follows:
[tex]{{\text{A}}_{\text{r}}} = \frac{{\sum {\left\{{\left({{\text{Relative isotopic mass}}}\right)\left({{\text{\% abundance}}}\right)}\right\}}}}{{100}}[/tex]
Here,
[tex]{{\text{A}}_{\text{r}}}[/tex] is the relative atomic mass.
It is given that copper (Cu) exists in two isotopic forms, one is 63 Cu, and the other is 65 Cu. So the relative atomic mass of Cu is calculated as follows:
[tex]{{\text{A}}_{\text{r}}}{\text{ of Cu}}=\frac{{\left[\begin{gathered}\left({{\text{Mass of 63 Cu}}}\right)\left({{\text{\% abundance of 63 Cu}}}\right)+\hfill\\\left({{\text{Mass of 65 Cu}}}\right)\left({{\text{\% abundance of 65 Cu}}}\right)\hfill\\\end{gathered}\right]}}{{100}}[/tex] …… (1)
The mass of 63 Cu is 62.9300 amu.
The percentage abundance of 63 Cu is 69.15 %.
The mass of 65 Cu is 64.9200 amu.
The percentage abundance of 65 Cu is 30.85 %.
Substitute these values in equation (1).
[tex]\begin{aligned}{{\text{A}}_{\text{r}}}{\text{ of Cu}}&=\frac{{\left[{\left( {{\text{62}}{\text{.9300 amu}}}\right)\left({{\text{69}}{\text{.15}}}\right)+\left({{\text{64}}{\text{.9200 amu}}}\right)\left({{\text{30}}{\text{.85}}}\right)}\right]}}{{100}}\\&=\frac{{{\text{4351}}{\text{.6095 amu}}+{\text{2002}}{\text{.782 amu}}}}{{100}}\\&={\text{63}}{\text{.543915 amu}}\\&\approx{\text{63}}{\text{.54 amu}}\\\end{aligned}[/tex]
So the relative atomic mass of copper on a newly discovered planet is 63.54 amu.
Learn more:
1. Calculate the moles of chlorine in 8 moles of carbon tetrachloride: https://brainly.com/question/3064603
2. Calculate the moles of ions in the solution: https://brainly.com/question/5950133
Answer details:
Grade: Middle School
Subject: Chemistry
Chapter: Mole Concept
Keywords: percentage abundance, 63 Cu, 65 Cu, 62.9300 amu, 64.9200 amu, 30.85 %, 69.15 %, 63.54 amu, copper, isotopes, carbon-12, Ar, Cu.
if you multiply an objects weight times it height, what value do you compute?
order these units from smallest to largest:cm,um,km,mm,m,nm,dm,pm. then give each a measurement in terms of meters.
How do I balance this equation:
__HNO3+ __Mg(OH)2 —> __Mg(NO3)2 + __H2O
Using a table that lists standard heats of formation, you can calculate the change in enthalpy for a given chemical reaction. the change in enthalpy is equal to _____. ∆hf0 of reactants minus ∆hf0 of products ∆hf0 of products plus ∆hf0 of reactants ∆hf0 of products divided by ∆hf0 of reactants ∆hf0 of products minus ∆hf0 of reactants
Answer:
∆hf0 of products minus ∆hf0 of reactants
Explanation:
Determine the numbers of atoms in each of the following 5.40 g B 0.250 mol k 0.0384 mol k 0.02550 g pt 1.00 x 10^-10 g Au,
Answer:
a) 5.40 g B : [tex]3.012\times 10^{23}[/tex] atoms
b) 0.250 mol K : [tex]1.51\times 10^{23}[/tex] atoms
c) 0.0384 mol K : [tex]0.23\times 10^{23}[/tex] atoms
d) 0.02550 g Pt: [tex]7.8\times 10^{19}[/tex] atoms
e) [tex]1.00\times 10^-{10} g[/tex] Au: [tex]0.03\times 10^{13}[/tex] atoms
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
a) 5.40 g B
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{5.40g}{11g/mol}=0.5moles[/tex]
1 mole of boron contains = [tex]6.023\times 10^{23}[/tex] atoms
Thus 0.5 moles of boron contain =[tex]\frac{6.023\times 10^{23}}{1}\times 0.5=3.012\times 10^{23}[/tex] atoms
b) 0.250 mol K
1 mole of potassium (K) contains = [tex]6.023\times 10^{23}[/tex] atoms
Thus 0.250 moles of potassium contain =[tex]\frac{6.023\times 10^{23}}{1}\times 0.250=1.51\times 10^{23}[/tex] atoms
c) 0.0384 mol K
1 mole of potassium (K) contains = [tex]6.023\times 10^{23}[/tex] atoms
Thus 0.0384 moles of potassium (K) contain =[tex]\frac{6.023\times 10^{23}}{1}\times 0.0384=0.23\times 10^{23}[/tex] atoms
d) 0.02550 g Pt
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{0.02550 g}{195g/mol}=1.3\times 10^{-4}moles[/tex]
1 mole of platinum contains = [tex]6.023\times 10^{23}[/tex] atoms
Thus [tex]1.3\times 10^{-4}moles[/tex] of platinum contain=[tex]\frac{6.023\times 10^{23}}{1}\times 1.3\times 10^{-4}=7.8\times 10^{19}[/tex] atoms
e) [tex]1.00\times 10^-{10}g[/tex] Au,
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{1.00\times 10^{-10}g}{197g/mol}=0.005\times 10^{-10}moles[/tex]
1 mole of gold contains = [tex]6.023\times 10^{23}[/tex] atoms
Thus [tex]0.005\times 10^{-10}moles[/tex] of platinum contain=[tex]\frac{6.023\times 10^{23}}{1}\times 0.005\times 10^{-10}=0.03\times 10^{13}[/tex] atoms
Which two values will a spontaneous reaction have?
+Eoreduction and +Eocell
-∆G and +Eocell
+∆G and +Eocell
+∆G and -Eocell
-∆G and -K
Answer:
-∆G and +Eocell
Explanation:
For an electrochemical reaction to be spontaneous, the change in free energy must be negative. This applies to all chemical reactions as a basic condition for spontaneity of chemical reactions.
More particular to an electrochemical cell is the value of the standard cell voltage. A positive value of standard cell voltage implies a spontaneous electrochemical reaction.
The percent composition of methyl butanoate is 58.8% C, 9.8% H, and 31.4 % O and its molar mass is 102 g/mol. What is its empirical formula? What is its molecular formula? @mayankdevnani,
Given:
C= 58.8% ,
H= 9.8% ,
and O=31.4 %
molar mass is = 102 g/mol.
empirical formula=
58.8/C(12.01)= 4.9
9.8/H(1.01)= 9.7
31.4/O(15.99)= 1.96
divide it by the least value so it is 1.96 which shows,
4.9/1.96= 2.5
9.7/1.96= 5
(C2.5H₅O)₂= C₅H₁₀O₂
molecular formula= C₁₀H₂₀O₄