After one half-life (10 seconds), 8 grams of krypton-91 will remain. After 50 seconds (or 5 half-lives), only 0.5 grams will be left.
Explanation:The question pertains to the concept of half-life in radioactive decay. Half-life is the time taken for half of the radioactive element to decay. With a half-life of 10 seconds, krypton-91 follows an exponential decay pattern. For example, if you start with 16 grams of krypton-91, after one half-life (10 seconds), half of it will decay, leaving you with 8 grams of krypton-91.
After 50 seconds or five half-lives, the remaining krypton-91 would be 16g * (1/2)^5 = 0.5 grams. It is important to note that the radioactive atoms don't disappear but are replaced by their decay products or daughter elements.
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The electrons in the outermost orbitals of an atom are referred to as _____. cations valence electrons anions s-orbitals
Valence electrons are electrons in the outermost orbit
Which mass measurement contains four significant figures? 1. 0.086 g 2. 0.431 g 3. 1003 g 4. 3870 g
Answer :
(1) The given number in 4 significant figures will be, [tex]8.600\times 10^{-2}g[/tex]
(2) The given number in 4 significant figures will be, [tex]4.310\times 10^{-1}g[/tex]
(3) The given number in 4 significant figures will be, [tex]1.003\times 10^3g[/tex]
(4) The given number in 4 significant figures will be, [tex]3.870\times 10^3g[/tex]
Explanation :
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
(1) The given number 0.086 g converted into 4 significant figures.
In 0.086 g, there are 2 significant figures. Now we have to convert it into 4 significant figures.
The given number in 4 significant figures will be, [tex]8.600\times 10^{-2}g[/tex]
(2) The given number 0.431 g converted into 4 significant figures.
In 0.431 g, there are 3 significant figures. Now we have to convert it into 4 significant figures.
The given number in 4 significant figures will be, [tex]4.310\times 10^{-1}g[/tex]
(3) The given number 1003 g converted into 4 significant figures.
Now we have to convert it into 4 significant figures.
The given number in 4 significant figures will be, [tex]1.003\times 10^3g[/tex]
(4) The given number 3870 g converted into 4 significant figures.
Now we have to convert it into 4 significant figures.
The given number in 4 significant figures will be, [tex]3.870\times 10^3g[/tex]
How many grams of water can be produced from 10 moles of hydrogen gas?
10 moles of hydrogen gas can produce 180.2 grams of water, calculated by using the balanced chemical equation and multiplying the number of moles of water by its molar mass.
The student's question asks how many grams of water can be produced from 10 moles of hydrogen gas. To solve this problem, we must first write out the balanced chemical equation for the reaction between hydrogen and oxygen to form water, which is:
2 H₂(g) + O₂(g) → 2 H₂O(l)
From the equation, it is clear that 2 moles of hydrogen gas react with 1 mole of oxygen to produce 2 moles of water. Therefore, 10 moles of hydrogen gas would theoretically produce 10 moles of water since the ratio is 1:1. Next, we find the molar mass of water, which is 18.02 g/mol. Multiplying the number of moles of water by the molar mass gives us:
10 mol H₂O × 18.02 g/mol H₂O = 180.2 grams H₂O
So, 10 moles of hydrogen gas can produce 180.2 grams of water.
How many nanoseconds are there in one minute?
Which term is a single pathway of feeding in an ecosystem? A. food web B. energy flow C. energy pyramid D. food chain
Select the correct numerical form of this number written in scientific notation. 6.2 × 10^5
Hey there Brainly Student! Your answer is 620.000!! I hope this helped!! Your friend, GalaxyGamingKitty
Lavoisier's discovery that air was not a substance but rather a mixture of nitrogen and oxygen is described as history-making. why do you think this description is accurate?
Which of the following horizons is considered a region of subsoil?
A.O horizon
B.D horizon
C.A horizon
D.B horizon
Answer:
B horizon
Explanation:
This horizon is considered a region of subsoil!
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The discovery of isotopes led to the discovery of _____.
a. electrons
b. neutrons
c. atoms
d. protons
How many protons and neutrons does a silicon si atom have and hwere are each of there subatomic particles located how many electrons does a silicon atom have?
How many moles of sodium iodide are needed to remove 5.95×10−6 mol of o3?
Final answer:
Assuming a 1:1 molar ratio, the number of moles of sodium iodide needed to remove [tex]5.95\times10^-^6[/tex] mol of ozone is also [tex]5.95\times10^-^6 mol[/tex].
Explanation:
To calculate the number of moles of sodium iodide (NaI) required to remove a certain number of moles of ozone [tex](O_3)[/tex], we need to know the stoichiometry of the reaction between NaI and [tex]O_3[/tex]. This information is not provided, so we'll have to assume it is a 1:1 molar ratio, which is typical for direct redox reactions where one molecule reacts with another one-on-one.
Under the assumption of a 1:1 molar ratio, to remove [tex]5.95\times10^-^6 mol[/tex] of [tex]O_3[/tex], you would need an equal amount of NaI, which would also be [tex]5.95\times10^-^6 mol[/tex] of NaI. We are assuming a straightforward reaction where one mole of [tex]O_3[/tex] reacts with one mole of NaI to form products.
Electrons in an atom may only have certain energy. because of this, the energy of the electrons in an atom is said to be ________.
The energy of the electrons in an atom is said to be quantized, meaning electrons can only have certain specific energy levels. These levels are characterized by quantum numbers, like the principal quantum number 'n', indicating different shells or orbits for the electrons.
Electrons in an atom may only have certain energy levels. This is because the energy of the electrons in an atom is said to be quantized. This means that the electrons can only possess specific amounts of energy, corresponding to distinct energy levels.
Niels Bohr suggested that electrons are restricted to certain orbits, and therefore, they can only have certain energy levels. Each energy level is described by quantum numbers, which are integer values that characterize the arrangement of electrons within an atom. For example, the principal quantum number, represented as 'n,' indicates different energy shells or levels, with higher 'n' values generally signifying higher energies.
Electrons are organized into energy shells labeled by the principal quantum number 'n', where the higher the energy of a shell, the farther (on average) it is from the nucleus. Each shell can contain a set number of electrons and the higher the shell number, which correspondingly indicates a higher energy level.
What is the molar mass of C4H10
The molar mass of C4H10 is 58.14 g/mol. There are approximately 9.54 × 10^22 molecules of C4H10 in 9.213 g of the compound, amounting to roughly 9.54 × 10^23 hydrogen atoms.
Explanation:Calculating Molar Mass and Number of Atoms
To find the molar mass of C4H10, we add the atomic masses of carbon (C) and hydrogen (H). Carbon has an atomic mass of approximately 12.01 g/mol, and hydrogen has an atomic mass of about 1.008 g/mol. Since the compound has four carbon atoms and ten hydrogen atoms, the calculation would be: (4 × 12.01) + (10 × 1.008) = 58.14 g/mol. Therefore, the molar mass of C4H10 is 58.14 g/mol.
To determine how many C4H10 molecules are contained in 9.213 g of this compound, we use the formula:
For C4H10 this gives us: Number of moles = 9.213 g ÷ 58.14 g/mol which equals approximately 0.1584 moles.
To convert moles to molecules, we use Avogadro's number (6.022 × 1023 molecules/mol):
So in this case: Molecules = 0.1584 mol × 6.022 × 1023 ≈ 9.54 × 1022 molecules of C4H10.
To find the number of hydrogen atoms, we multiply the number of C4H10 molecules by the number of hydrogen atoms per molecule:
This results in: Hydrogen atoms = 9.54 × 1022 × 10 ≈ 9.54 × 1023 hydrogen atoms.
Determine the oxidation state of the transition metal in each of these coordination compounds.
One liter of a solution ph 9 has how many more hydroxide ions (oh-) than 1 l of a solution of ph 4?
A solution with a pH of 9 has 100,000 times more hydroxide ions than a solution with a pH of 4 due to the corresponding pOH values and hydroxide ion concentrations based on the relationship between pH and pOH.
Explanation:The student has asked about the difference in the number of hydroxide ions between a solution with a pH of 9 and another with a pH of 4. Using the relationship PH + pOH = 14, we can find the pOH.
For the pH 9 solution, the pOH would be 5 (14 - 9), which corresponds to a [OH-] of 1.0 × 10-5 M. For the pH 4 solution, the pOH would be 10 (14 - 4), corresponding to a [OH-] of 1.0 × 10-10 M. Hence, the pH 9 solution has 1.0 × 10-5 M of OH-, which is 100,000 times greater than the 1.0 × 10-10 M OH- in the pH 4 solution.
Of the molecules sicl4 and sii4, which has bonds that are more polar?
Answer:
Since the electronegativity difference between the atoms is greater in SiCl4 , it has bonds that are more polar when compound to the other compound.
Explanation:
An iceberg has a volume of 9470 ft3.What is the mass in kilograms of the iceberg? The density of ice in the iceberg is 0.92 g/cm3.
In this response, it is explained how to calculate the mass of the iceberg and the heat required to melt it based on its volume and the density of ice.
(a) Mass of the iceberg:
To find the mass, we need to convert the volume from cubic feet to cubic meters (1 ft³ = 0.02832 m³). Then, mass = density x volume. So, mass = 917 kg/m³ x (9470 ft³ x 0.02832 m³/ft³).
(b) Heat to melt iceberg:
The heat needed to melt the iceberg is equal to the heat of fusion of ice (334 kJ/kg) x mass of iceberg in kilograms.
What is the formula of a compound that contains na+ and po43- ions? question 8 options: na3po4 napo4 na2po3 na3po3 na3p?
Answer: [tex]Na_3PO_4[/tex].
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here sodium is having an oxidation state of +1 called as [tex]Na^+[/tex] cation and phosphate [tex]PO_4^{3-}[/tex] is a polyatomic anion with oxidation state of -3. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]Na_3PO_4[/tex].
The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.
Why are the halogens less reactive going down the periodic table ?
What property is used to organize elements on the periodic table?
Final answer:
The periodic table uses atomic number as the key property to organize elements, arranged in order of increasing atomic numbers and grouping elements with similar properties.
Explanation:
The property used to organize elements on the periodic table is their atomic number, which reflects the number of protons in an atom's nucleus. Dmitri Mendeleev initially created the periodic table, which was later redefined to use atomic number rather than atomic mass. The table arranges elements in rows (periods) and columns (groups), based on increasing atomic numbers and recurring chemical properties. Elements within the same group share similar properties and the table often includes each element's atomic number, chemical symbol, average atomic mass, and sometimes its name.
Furthermore, the periodic table also reflects patterns in electronic configurations that lead to the periodicity of properties, like ionization energy and electron affinity, which influence the physical and chemical behavior of the elements.
Elements in a group have the same number of valence electrons and the same ____
Elements in a group have the same number of valence electrons and the same chemical properties because the valence electrons determine how an element will react with other elements.
Explanation:The elements in a group have the same number of valence electrons and the same chemical properties. Valence electrons are the electrons in the outermost energy level of an atom, and they determine how an element will react with other elements. The similarity in chemical properties among elements of the same group occurs because they have the same number of valence electrons. For example, all the elements in Group 1 (alkali metals) have one valence electron, and they all react violently with water to form alkaline solutions.
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The complete sentence should be, Elements in a group have the same number of valence electrons and the same chemical properties,
Which is why they exhibit similar reactivity and behavior. This periodic trend is consistent across groups and can be exemplified by alkali metals and halogens.Elements in a group have the same number of valence electrons and the same chemical properties. This is because the number of valence electrons determines how elements react, including their tendency to lose, gain, or share electrons.The periodic trend of valence electrons illustrates this clearly: for example, all alkali metals in Group 1 have one valence electron, while all halogens in Group 17 have seven valence electrons. This similarity in electron configuration results in comparable reactivity and chemical behavior among elements in the same group.Covalent solutes are considered non-electrolytes. What does this mean for the conductivity of the solution? A) Non-electrolytes dissolve and completely dissociate in water providing charged ions to conduct electricity. B) Non-electrolytes dissolve and do not dissociate in water providing no charged ions to conduct electricity. C) Being a non-electrolyte refers the type of bonding and has no bearing on conducting electricity. D) Non-electrolytes do not dissolve in water and can not conduct electricity.
Electrolytes are those which dissociates in solution and produces ions.
Ions can carry current,so Electrolytes conduct electiricity.
And non electrolytes are those which do not dissociate in solution and doesnt produce ions.
Since non electrolytes do not produce ions they cannot conduct electricity.
Hence the right option is:
B) Non-electrolytes dissolve and do not dissociate in water providing no charged ions to conduct electricity.
Answer: Option (D) is the correct answer.
Explanation:
When a chemical compound dissociates into ions in a solution then the resulting solution is known as electrolyte.
For example, HCl dissolved in water will act as an electrolyte.
And, when a chemical compound does not dissociate into ions when dissolved in a solvent then the resulting solution is known as a non-electrolyte.
For example, [tex]CCl_{4}[/tex] in water will act as a non-electrolyte.
As a non-electrolyte does not contains ions therefore, they do not conduct electricity. Also, covalent compounds do not dissociate into ions when dissolved in water.
Thus, we can conclude that the statement non-electrolytes do not dissolve in water and can not conduct electricity, is true.
What is the correct symbol for lithium ion that lost two electrons?
Carbon-12 is the most common isotope of carbon and has a mass number of 12. however, the average atomic mass of carbon found on a periodic table is slightly more than 12 daltons. why?
Two or more atoms held together by covalent bonds is called a(n) __________
2. You have 2 m3 of a mineral ore sample. It has a mass of 1 × 104 kg. Calculate the density of the ore sample and express your results in g/cm3 with appropriate scientific notation.
Energy is expended when a force moves matter across a distance.
True
False
The conservation of mass-energy and the first law of thermodynamics are synonymous.
True
False
Temperature and thermal energy are synonymous terms.
True
False
On the Kelvin scale, temperatures are expressed as positive values only.
True
False
The amount of heat transfer required to change the temperature of one gram of water one degree Celsius is also known as a calorie.
True
False
Astrophysicist who first advanced the idea that the chemical elements originated from hydrogen in stars.
how many mg are there in a 5.00 grain aspirin tablet ? 1 grain = 0.00229 oz . there are 454 g/lb
To convert the mass of a 5.00-grain aspirin tablet to milligrams, convert grains to ounces, ounces to grams, and grams to milligrams. A 5.00-grain aspirin tablet is approximately 324.56 milligrams.
Explanation:The question is asking to convert the mass of a 5.00-grain aspirin tablet into milligrams. Since 1 grain is equal to 0.00229 ounces, we first need to convert ounces to grams and then to milligrams. We know that there are 28.3495 grams in an ounce, and 1 gram is equal to 1000 milligrams.
First, convert 5.00 grains to ounces:
5.00 grains * 0.00229 oz/grain = 0.01145 oz
Next, convert 0.01145 ounces to grams:
0.01145 oz * 28.3495 g/oz = 0.324555675 grams
Lastly, convert grams to milligrams:
0.324555675 g * 1000 mg/g = 324.555675 mg
Therefore, a 5.00-grain aspirin tablet is approximately 324.56 milligrams.
Sodium, which has an atomic number of 11, will react with chlorine, which has an atomic number of 17. when these two atoms react, both become stable. to become stable, sodium will ____________, while chlorine will ____________.
Explanation:
Atomic number of sodium is 11 and its electronic distribution is 2, 8, 1. Whereas atomic number of chlorine is 17 and its electronic distribution is 2, 8, 7.
As we known that in order to attain stability each element must have 8 electrons in its outer orbital. Therefore, in order to attain stability sodium will lose one electron and chlorine will tend to gain one electron.
As a result, an ionic bond will be formed between sodium and chlorine and hence, NaCl is formed.
Thus, we can conclude that sodium, which has an atomic number of 11, will react with chlorine, which has an atomic number of 17. when these two atoms react, both become stable. to become stable, sodium will lose, while chlorine will gain an electron.