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Question 1: Turn 25 coins tails up. You now have 50% parent material and 50% daughter material. What is the half life of this substance? (20 Points)
Answer:
Based upon the given information, we can assume that the half life of this coin material is 5 years.
Question 2: Imagine that another half life has gone by. Remember that ONLY the parent material can change to the daughter material. Turn over your pennies to represent the passing of another half life. How much total parent material and how much total daughter material do you now have? You may express your answer in number of pennies or in %. (Note: Since you cannot turn over half a penny, round the actual number of pennies you would turn over up.) (20 points)
Answer:
Based upon the given information from Question 2 and Question 3, we can assume that 13 additional coins would be turned over. We started with 50, than flipped 50% of them over, and now another 50% over. We have 12 coins left.
Question 3: How many half lives will pass before you have only 3 pennies that are parent material and 47 pennies that are daughter material? (20 Points)
Answer:
Based upon the given information from all the questions, and based upon our answers we can assume this:
1st half-life: 50 turned to 25 coins
2nd half-life: 25 turned to 12 coins
3rd half-life: 12 turns to 6 coins
4th half-life: 6 turns to 3 coins
So, after 4 half-lives (or after 20 years) we would have 3 coins left that have parent material.
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For future reference please do not post as complex questions like this, if you do (post a question that is similar to this) please state the following information:
"All questions posted in this post relate to one-another and cannot be answered without the other questions..."
If you increase the force of an object what happens to the acceleration
An open box of bandages is on the floor.Bandages wrappers are found nearby,what chemical treatment do you use.
Whicj of the following ions would represent the ion of an element from group 2A
can you guys help me.
Fill in the blank
1. A(n) chemical _______________ is a description of a reaction using element symbols and chemical
formulas.
2.. _______________ are the starting substances in a chemical reaction.
3.. _______________ are the substances produced by a chemical reaction.
4. Mass is conserved in a chemical reaction because atoms are not _______________ or
_______________.
5.To show that mass is conserved, a chemical equation must be _______________, which means that
the number of each type of atoms must be the same on both sides of the equation.
6. Numbers in front of the symbols and formulas in an equation are called ____________________.
Study the following equation, then answer questions on the lines provided.
____ Al (s) + ____ CuCl (aq) → ____ AlCl3 (aq) + ____ Cu (s)
7. What are the products? ____________________________________________________
8. What are the reactants? ____________________________________________________
Suppose the liquid water and ice cream did not have solutes dissolved in it. What effect do you think this would have on ice cream ?
Choose all the answers that apply.
Cell waste is removed from the body by _____.
- breathing
- sweating
- going to the bathroom
- eating
A powdered drink mix is stirred into a glass of water to form a solution. If any more is added it will not dissolve
How much work (in J) is involved in a chemical reaction if the volume decreases from 5.00 to 1.48 L against a constant pressure of 0.819 atm?
Why would sand and water be an example of a heterogeneous mixture?
Select all that apply.
Chemical bonds are formed between the sand and water.
*The mixture does not have a uniform appearance.
*The mixture does not maintain a uniform composition.
The sand stays suspended in the water.
1. Is mass conserved when 50 g of sugar undergoes a physical change? Use complete sentences to support your answer by explaining how this can be demonstrated.
2. During an investigation a scientist burned 48 g of magnesium strip. After the reaction the total mass of the product formed was found to be 80 g. Does the law of conservation of mass hold true in this case? Use complete sentences to justify your answer based on numerical calculations.
ACTUALLY answer the question please instead of posting stupid comments like on the last one
Answer:
Mass is still conserved even if it is melted or dissolved it is still conserved during and after the transformation.
Explanation:
I only have the answer to the first one. I did this on my school platform and still got it right.
what's the formula unit for magnesium and sulfur?
Both gold (Au) and oxygen (O) are listed on the periodic table. What do both Gold and Oxygen have in common?
Why do ionic compounds hve high melting points and boiling points
Answer:
Ionic compounds have high melting and boiling points due to their strong ionic bonding. This is due to the strong electrostatic interactions between positive and negative ions. That's why a large amount of energy is needed to break the bonding between ions.
Explanation:
Write the symbolic notation of an isotope of an element having 8 protons, 8 electrons, and 9 neutrons
The element is identified exclusively by its number of protons. Atomic and mass numbers are included in isotopic notation. Oxygen isotope has an atomic number of 8 protons, 8 electrons, and 9 neutrons.
What is Isotopes?A chemical element's isotope is any of two or more species of atoms that share the same atomic number, position in the periodic table, and virtually identical chemical behavior.
But differ in atomic mass and physical characteristics. There are one or more isotopes for each chemical element.
Isotopes are forms of an element that have the same number of protons and electrons, but differing numbers of neutrons.
The many isotopes of an element have varying weights depending on how many neutrons there are in each one.
Therefore, Atomic and mass numbers are included in isotopic notation.
Learn more about isotopes here:
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How many moles are in a 12.0 g sample of Fe2O3?
We know that Fe2O3 has a molar mass of 159.69 g / mol, therefore the number of moles of a 12 g sample is:
number of moles = 12 g / (159.69 g / mol)
number of moles = 0.075 mol
How are molecules and compounds related??
Someone please help me with this one
all organelles need energy to function which cell organelle provides the energy?
The correct answer is chloroplast
2.11 Quiz: Plant and Animal Cells
Chloroplasts produce energy via photosynthesis in plant cells, while mitochondria fulfill this role in both plant and animal cells. The correct answer is chloroplast.
In both plant and animal cells, the mitochondria are the organelles responsible for producing energy. They convert nutrients and oxygen into adenosine triphosphate (ATP), which is used as a source of chemical energy for cellular processes. However, plants have an additional organelle for energy production: the chloroplast. Chloroplasts capture light energy and use it to convert carbon dioxide and water into glucose and oxygen through the process of photosynthesis. This glucose can then be used by the plant cell for energy or stored for later use.
In the context of the question, while mitochondria are the primary energy-providing organelles in all eukaryotic cells, the question specifies in the context of a quiz on plant and animal cells. Since chloroplasts are unique to plant cells and are essential for photosynthesis, the correct answer in this context is chloroplast, as it is the organelle that provides energy through photosynthesis in plant cells. Mitochondria would still be correct for animal cells or as a more general answer for eukaryotic cells, but the specific answer provided here is chloroplast, which is unique to plant cells.
If the pattern of ions shown here for Galena is expanded in every direction, how many sulfide ions would surround each lead ion? How many lead ions would surround each sulfide ion?
If the pattern of ions in Galena is expanded, each lead ion would be surrounded by six sulfide ions, and each sulfide ion would be surrounded by six lead ions.
Galena (PbS) is a crystalline mineral with a specific repeating pattern of ions in its crystal lattice. Each lead (Pb) ion is surrounded by six sulfide (S²⁻) ions in a regular octahedral arrangement. In other words, if you expand this pattern in every direction, each lead ion would be surrounded by six sulfide ions.Conversely, each sulfide ion is also surrounded by six lead ions. This is because the arrangement of ions in a crystal lattice is such that each ion is surrounded by ions of the opposite charge to maintain overall electrical neutrality. In the case of galena, the lead ions and sulfide ions come together to form a highly structured crystal lattice where each ion is coordinated with six ions of the opposite charge.So, to summarize: Each lead ion in galena is surrounded by six sulfide ions. Each sulfide ion in galena is surrounded by six lead ions.For more such questions on ions
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which sample of co2 has a definite shape and a definite volume
The mass of the products after the reaction is 292 grams.Therefore, the mass of the reactants before the chemical reaction was_____
Calculate the osmotic pressure of a solution containing 24.6g of glycerin in 250ml of solution at 298K
Final answer:
The osmotic pressure of a solution containing 24.6g of glycerin in 250ml of solution at 298K is calculated using the formula for osmotic pressure and found to be 26.2 atm.
Explanation:
To calculate the osmotic pressure of a solution containing 24.6g of glycerin (C₃H₅(OH)₃) at 298K, we first need to find the molarity of the solution. Given that the molar mass of glycerin is approximately 92.09 g/mol, the moles of glycerin can be calculated as:
Moles of glycerin = 24.6 g / 92.09 g/mol = 0.267 moles
Since the solution volume is 250 mL, or 0.25 L, the molarity (M) of the solution is:
M = Moles of solute / Volume of solution (L) = 0.267 moles / 0.25 L = 1.068 M
The formula to calculate osmotic pressure (Π) is Π = iMRT, where:
i is the van't Hoff factor (For glycerin, i = 1 because it doesn’t dissociate in solution).
M is the molarity of the solution.
R is the ideal gas constant (0.0821 L.atm/mol.K).
T is the temperature in Kelvin.
Substituting the values into the formula gives:
Π = (1)(1.068 M)(0.0821 L.atm/mol.K)(298 K) = 26.2 atm
Therefore, the osmotic pressure of the solution is 26.2 atm.
science question down below
If u could invent one “science gizmo,” what would it be?
My chosen 'science gizmo' invention would be a time machine, using gravity as a conduit to traverse through different periods of time as suggested in general relativity theories.
Explanation:If I had to invent a 'science gizmo,' it would be a time machine influenced by the theories of gravity and time machines as presented in the field of general relativity. A time machine is a concept often seen in science fiction, which manipulates gravity to allow movement through time at a pace or direction different from our current linear understanding. Though only theoretical, the potential to explore different periods of time or leap into the future offers exciting possibilities.
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Which are negative impacts that the internal combustion engine has had on society?
A.high power and health problems
B.noise pollution and health problems
C.efficient travel and noise pollution
D.efficient travel and high power
passive transport involves movement of substances from?
What is the correct name of this covalent compound BF3?
Question 11 options:
dinitrogen trioxide
dinitrogen oxalate
nitrogen oxide
nitrogen(III) oxide
Answer:
None of them. The correct name of the covalent compound is Boron Trifluoride.
Explanation:
BF3 - due to there being 1 Boron atom and three fluorine atoms, we will name:
B - Boron
F3 - because there is three fluorine, we will put the tri- prefix in front of Fluorine and change the ending to -ide.
With that, you get Boron Trifluoride.
Which has more mass a kilogram of bricks or a kilogram of feathers explain
What do seed plants and ferns have in common
Final answer:
Seed plants and ferns are both vascular plants with a dominant sporophyte generation and a system of vascular tissues. Ferns are advanced seedless vascular plants with fronds, while seed plants include gymnosperms and angiosperms that bear seeds, with angiosperms also producing flowers.
Explanation:
Seed plants and ferns share several common features as they are both types of vascular plants. Firstly, both have a system of vascular tissues that conduct water and nutrients throughout the plant. This includes the xylem, which carries water, and the phloem, which distributes sugars and other organic compounds. Additionally, both seed plants and ferns exhibit a life cycle with a dominant sporophyte generation, meaning the diploid stage is the more noticeable and long-lived phase. While ferns reproduce through spores and do not produce seeds or flowers, the two groups share an evolutionary background, with ferns representing an important precursor in the evolution of seed plants.
Ferns are distinguished by their large, divided leaves known as fronds, which develop from fiddleheads, and they tend to thrive in moist and shaded environments. Ferns, which emerged during the Devonian period, are some of the most advanced seedless vascular plants. They also have roots and small structures called sori on the underside of the fronds where sporangia are contained. In contrast, seed plants encompass gymnosperms and angiosperms, which bear seeds and in the case of angiosperms, flowers as well. The presence of seeds in seed plants and spores in ferns is a critical difference between the two groups but does not overshadow their vascular plant commonalities.
What type of reaction does the equation below represent? N2 + 3H2 —> 2NH3
a. synthesis
b. decomposition
c. single replacement
d. double replacement
How many moles of MgSiO3 are in 199 g of the compound?
There are 1.98 moles of MgSiO₃ in 199 g of the compound, so one needs to use the molar mass of MgSiO₃, which is the sum of the atomic masses of its constituent elements.
What are moles of compound?The atomic mass of Mg is 24.31 g/mol, the atomic mass of Si is 28.09 g/mol, and the atomic mass of O is 16.00 g/mol. Therefore, the molar mass of MgSiO₃ is:
molar mass of MgSiO₃ = (1 x atomic mass of Mg) + (1 x atomic mass of Si) + (3 x atomic mass of O)
molar mass of MgSiO₃ = (1 x 24.31 g/mol) + (1 x 28.09 g/mol) + (3 x 16.00 g/mol)
molar mass of MgSiO3 = 100.39 g/mol
moles = mass/molar mass
To calculate the number of moles of MgSiO₃ in 199 g of the compound:
moles of MgSiO₃ = 199 g / 100.39 g/mol
moles of MgSiO₃ = 1.98 mol
Hence, there are 1.98 moles of MgSiO₃ in 199 g of the compound, so one needs to use the molar mass of MgSiO₃, which is the sum of the atomic masses of its constituent elements.
Learn more about the moles of a compound here.
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