Answer:
Answer C
Explanation:
just took the test
This exercise uses the radioactive decay model.
A wooden artifact from an ancient tomb contains 80% of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years. Round your answer to the nearest whole number.)
I need the answer in yrs. ...?
The artifact was made approximately 1866 years ago.
To solve this problem, we can use the formula for exponential decay:
[tex]\[ N = N_0 \left( \frac{1}{2} \right)^\frac{t}{T_{1/2}} \][/tex]
Where:
- [tex]\( N \)[/tex] is the final amount of the substance (in this case, the remaining amount of carbon-14 in the artifact).
- [tex]\( N_0 \)[/tex] is the initial amount of the substance (in this case, the amount of carbon-14 in living trees).
- [tex]\( t \)[/tex] is the time that has passed (in years).
- [tex]\( T_{1/2} \)[/tex] is the half-life of the substance (in this case, 5730 years).
Given that the wooden artifact contains 80% of the carbon-14 present in living trees, we can set up the equation as follows:
[tex]\[ 0.80N_0 = N_0 \left( \frac{1}{2} \right)^\frac{t}{5730} \][/tex]
Now, we can solve for t, the time that has passed:
[tex]\[ \left( \frac{1}{2} \right)^\frac{t}{5730} = 0.80 \][/tex]
Taking the natural logarithm of both sides to isolate the exponent:
[tex]\[ \frac{t}{5730} \ln \left( \frac{1}{2} \right) = \ln(0.80) \][/tex]
[tex]\[ \frac{t}{5730} = \frac{\ln(0.80)}{\ln \left( \frac{1}{2} \right)} \][/tex]
[tex]\[ t = 5730 \times \frac{\ln(0.80)}{\ln \left( \frac{1}{2} \right)} \][/tex]
[tex]\[ t \approx 1865.896 \, \text{years} \][/tex]
Rounding to the nearest whole number, we get:
[tex]\[ t \approx 1866 \, \text{years} \][/tex]
Therefore, the artifact was made approximately 1866 years ago.
In a periodic table, a set of properties repeats from:
A)Element to Element
B)Group to group
C)Column to column
D) Row to row
In the Periodic Table, a set of properties repeats from group to group, not element to element, column to column, or row to row. This is because elements in the same group have the same number of valence electrons.
Explanation:In the context of the Periodic Table, a set of properties repeats not from element to element, or column to column, or row to row, but actually from group to group. This is because elements in the same group or column of the periodic table have the same number of electrons in their outer orbitals (Valence Electrons). This concept is known as periodicity. For instance, all elements in Group 1 (alkali metals) are very reactive metals because they each have one electron in their outermost shell.
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3.draw a picture of a atom and post it on here for me
Answer:
This took me a really long time I hope you like it ;]
Drawn by a marker
Explanation:
What are the products of the double-replacement reaction between potassium bromide and silver nitrate? Name the resulting compounds.
Answer: The products formed are potassium nitrate [tex](KNO_3)[/tex] and silver bromide ( AgBr ).
Explanation: Double replacement or double displacement reactions are the reactions in which the positive ions and negative ions of the two reactants interchange to form the products. These reactions are carried out on the basis of their position in reactivity series.
The elements lying above in the reactivity series will be able to displace the elements that lie below in the reactivity series.
For the reaction of potassium bromide and silver nitrate, the reaction follows:
[tex]KBr(aq.)+AgNO_3(aq.)\rightarrow AgBr(s)+KNO_3(aq.)[/tex]
The resulting products are potassium nitrate [tex](KNO_3)[/tex] and silver bromide ( AgBr ).
A substance with equal numbers of H+ ions and OH- ions is a basic solution.
True
False
Answer: False
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.
[tex]pH=-\log [H^+][/tex]
[tex]pOH=-\log[OH^-][/tex]
When the concentration of [tex][H^+]=[OH^-][/tex], the solution is neutral, [tex]H^+[/tex]> [tex]OH^-[/tex] , the solution is acidic and if [tex]H^+[/tex]< [tex]OH^-[/tex] , the solution is basic.
Why do scientists use atoms in the gas phase to measure ionization energies and electron affinities
Answer:
At the gaseous phase the intermolecular force of attraction between atoms becomes far apart. The atoms can easily be added up with an electron or electrons can be removed from an atom.
Higher energy is required in this process.
Explanation:
Why do scientists use atoms in the gas phase to measure ionization energies and electron affinities
Electron Affinity is where there is a change in energy when electron is added to atom in its gaseous phase. The atom becomes negatively charged.
Ionization Energy is defined as the energy required to remove an electron from gaseous atom.
At the gaseous phase the intermolecular force of attraction between atoms becomes far apart. The atoms can easily be added up with an electron or electrons can be removed from an atom.
A material will float on the surface of a liquid if the material has a density less than that of the liquid. Given that the density of water is approximately 1.0 g/mL, will a block of material having a volume of 1.2 x 10^4 in^3 and weighing 350 lb float or sink when placed in a reservoir of water?
A neutral charge by an atom is caused by which of the following conditions?
a. presence of neutrons in the nucleus
b. balance in number of protons and neutrons
c. balance in number of electrons and protons
d. the balance of electrons in each electron shell
Answer:
C.) balance in number of electrons and protons.
Explanation:
Its the right answer i swear!!!
When the patient comes into the pharmacy to pick up a prescription, the pharm tech must
a. ask if the patient has any additional shopping to do.
b. confirm the patient's home phone number.
c. ask if the patient has any questions for the pharmacist.
d. verify the prescribing physician's name and address.?
The diffusion of water molecules across a selectively permeable membrane from an area of higher concentration to an area of lower concentration is
What is the mass of 3.01 x 10^23 molecules of oxygen?
Final answer:
The mass of 3.01 x 10^23 molecules of oxygen is 9.632 x 10^23 grams.
Explanation:
The mass of 3.01 x 10^23 molecules of oxygen can be calculated using the concept of molar mass. The molar mass of oxygen (O2) is 32.00 g/mol.
Therefore, the mass of 1 mole of oxygen is 32.00 g.
Using this information, we can set up a conversion factor to find the mass of 3.01 x 10^23 molecules:
1 mole of O2 = 32.00 g
3.01 x 10^23 molecules of O2 = x grams
Cross multiplying gives us:
x = (3.01 x 10^23 molecules of O2 * 32.00 g) / 1 mole of O2
x = 9.632 x 10^23 g
Therefore, the mass of 3.01 x 10^23 molecules of oxygen is 9.632 x 10^23 grams.
What is the definition of the term salt??
What is the empirical formula for a compound if a sample contains 1.0 g of S and 1.5 g of O?
SO
SO3
S2O2
S2O3
How many moles of oxygen atoms in one mole of CO2
Which of the following has the greatest mass?
A. 1 mole of oxygen
B. 1 mole of sodium
C. 1 mole of chlorine
D. 1 mole of uranium
Answer:
1 mole of uranium
Explanation:
It is the greatest with about a mass of about 238 amu or 238 g/mol
What does ozone do to make life on earth possible?
Study the following reaction carefully. What classification should this reaction have?
4Al + 3O2 = 2Al2O3..... synthesis, decomposition, single replacement, double displacement
Answer:
synthesis
Explanation:
The reaction equation properly written is shown below:
4Al + 3O₂ → 2Al₂O₃
A synthesis reaction is a form of combination of atoms. It involves the formation of a single product from two or more reactants.
Decomposition is the formation of two or more products from a single reactant.
Single replacement is a reaction in which one substance is replacing another.
In double displacement, there is an actual exchange of partners to form new compounds.
Answer:
synthesis
Explanation:
Use the following equation to complete the questions below. 2C2H6 + 7O2 → 4CO2 + 6H2O How many moles of oxygen would you need to produce 25 moles of CO2? How many moles of water would be produced if you used 32 moles of O2?
A compound composed of electrically chargerd atoms is called?
How are plate tectonics related to earth's surface features?
Which color of light bends the least when passing through a prism?
Which observation would best support that the bond present was a covalent bond?
Answer:
A covalent bond is present between two non-metals that share electrons in their molecular structure.
Explanation:
Examples of covalent bonds may be between carbon dioxide or water. And there may be three types of covalent bonds such as ionic, covalent and polar. In the first type, there is a transfer of an electron resulting in a gain for one of the atoms. In the second type, there is a sharing of electrons between the atoms. The third type is characterized by a difference in electronegativity between atoms.
Answer: carbon and oxygen share pairs of valence electrons
Explanation: its self explanatory
The density of solid W is 19.3 g/cm3. How many atoms are present per cubic centimeter of W?
As a solid, W adopts a body-centered cubic unit cell. How many unit cells are present per cubic centimeter of W?
What is the volume of a unit cell of this metal? What is the edge length of a unit cell of W? Please explain! Thanks!
The density of solid W is 19.3 g/cm³. To find the number of atoms per cm³, we calculate the volume of one unit cell of W and then multiply by the number of unit cells. The volume of one unit cell is found using the formula for the volume of a cube. The edge length of a unit cell is 3.165 Å.
Explanation:The density of solid W is given as 19.3 g/cm³. To calculate the number of atoms per cubic centimeter of W, we need to know the volume of one W atom. Since W adopts a body-centered cubic unit cell, each unit cell contains 2 atoms (1 atom in the center and 8 atoms at each corner). The volume of one unit cell can be calculated using the formula for the volume of a cube: volume = edge length³. Given that the edge length is 3.165 Å, we can convert it to cm and calculate the volume of one unit cell. Once we have the volume of one unit cell, we can calculate the number of unit cells per cubic centimeter of W.
The volume of one unit cell of W is (3.165 Å)³ = 31.152 ų. Converting this to cm³ gives us 3.1152 x 10⁻²³ cm³. To find the number of unit cells per cm³, we take the reciprocal of the volume of one unit cell: 1/(3.1152 x 10⁻²³ cm³) = 3.2054 x 10²² unit cells/cm³. Since each unit cell contains 2 atoms, the number of atoms per cm³ can be calculated by multiplying the number of unit cells by 2: 3.2054 x 10²² x 2 = 6.4108 x 10²² atoms/cm³.
The volume of one unit cell is given by the formula volume = edge length³. In this case, the edge length is 3.165 Å. To find the volume of one unit cell in cm³, we need to convert the edge length from Å to cm: 3.165 Å = 3.165 x 10⁻⁸ cm. Now, we can calculate the volume of one unit cell: (3.165 x 10⁻⁸ cm)³ = 3.1152 x 10⁻²³ cm³. The edge length of a unit cell is 3.165 Å, or 3.165 x 10⁻⁸ cm.
You missed breakfast and now it is lunch time and you aren the middle of an expieriment. What safety precautions should you employ to satisfy your hunger?
A- Pause your experiment and wash your hands before eating a snack
B- Handle your food with a chemical barrier
C- Finish your experiment, wash your hands, and leave the lab
D- Use a fork or spoon to safely handle your food
a hydrate of CoCl2 with a mass of 6.00 is heated strongly, after cooling the mass of the anhydrate is 3.27g. how many grams of H2O were lost from the hydrate
What is the abreviation for carbon dioxide??
The abbreviation for carbon dioxide is CO₂, which represents its chemical composition of one carbon atom and two oxygen atoms.
Explanation:The abbreviation for carbon dioxide is CO₂. This is derived from the chemical formula for carbon dioxide, which includes one carbon atom (C) and two oxygen atoms (O₂). This formula reflects the compound's composition and is used commonly in chemistry to denote different substances.
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What is the name of a solution whose concentration of solute is equal to the maximum concentration that is predicted from the solute's solubility?
dilute
saturated
unsaturated
supersaturated
Answer: The correct answer is saturated solution.
Explanation:
For the given options:
Dilute solutions are defined as the solutions in which solute particles are present in less very amount than the solvent particles.
Unsaturated solutions are defined as the solutions where more and more of solute particles can be dissolved in the given amount of solvent.
Saturated solutions are defined as the solutions where no more solute particles can be dissolved in the solvent. The concentration of the solute particles that can be dissolved in a solution is maximum.
Supersaturated solutions are defined as the solutions where more amount of solute particles are present than the solvent particles.
From the above information, we conclude that the given solution is saturated solution.
Answer:
The correct answer is saturated
Explanation:
Hello!
Let's solve this!
Diluted solutions are when you have more solvent than solute.
The saturated solution is when it has the same amount of solute as of solvent.
The unsaturated solution is the solution in which the solvent can still receive more solute.
The supersaturated solution is when it has more solute than the one that can dissolve the solvent.
Then the correct answer is saturated where the solvent already has the maximum amount of solute that can dissolve.
Which types of matter are made of atoms?
A. solids only
B. solids and liquids only
C. plasma only
D. solids, liquids, gases and plasma
...?
in a particular redox reaction, Cr is oxidized to CrO42- and Ag+ is reduced to Ag. Complete and balance the equation for this reaction in acidic solution.
Answer:
The complete and balance the equation for this reaction in acidic solution is given by:
[tex]Cr+4H_2O+6Ag^+\rightarrow CrO_4^{2-}+8H^++6Ag[/tex]
Explanation:
Oxidation reaction of chromium to chromate in acidic medium:
[tex]Cr\rightarrow CrO_4^{2-}[/tex]
Add 4 molecules of water on the left hand side to balance the oxygen:
[tex]Cr+4H_2O\rightarrow CrO_4^{2-}[/tex]
Now balance hydrogen atoms by adding hydrogen ions on opposite to the side where water molecule are present .
[tex]Cr+4H_2O\rightarrow CrO_4^{2-}+8H^+6e^-[/tex]....[1]
In last, to balance the charge on the both sides add electrons to sides where positive charge is more.
Reduction reaction of silver ions to silver in acidic medium:
[tex]Ag^++e^-\rightarrow Ag[/tex]..[2]
By [1] + 6 × [2] , we will get the balance equation for this reaction in acidic solution:
[tex]Cr+4H_2O+6Ag^++6e^-\rightarrow CrO_4^{2-}+8H^+6e^-+6Ag[/tex]
[tex]Cr+4H_2O+6Ag^+\rightarrow CrO_4^{2-}+8H^++6Ag[/tex]
Which kind of substance needs more energy to undergo an increase of 25 degrees Celsius something with a high or low specific heat ?
Final answer:
A substance with a high specific heat requires more energy to increase its temperature by 25°C than a substance with a low specific heat, because it absorbs more heat without a significant temperature change.
Explanation:
A substance that requires more energy to undergo an increase in temperature has a high specific heat. Specific heat is defined as the amount of heat energy required to raise the temperature of 1 gram of a substance by 1°C. A material with a high specific heat will absorb more heat without a significant rise in temperature. For instance, water has a high heat capacity and specific heat, making it resistive to temperature change. Therefore, a substance with a high specific heat needs more energy to experience a temperature increase of 25°C compared to one with a low specific heat. Conversely, a substance with a low specific heat requires less energy to change its temperature, as its temperature will rise more quickly when heat is applied.