1. The half life of the element, given the data from the question is 1600 years
2. The time taken for 312 g of the sample to decay to 9.75 grams is 8000 years
1. How to determine the half life of the elementHalf-life is the time taken for half a material to decay.
To determine the half life of the given element, do the following:
Original amount = 56 gHalf the original amount = 56 / 2 = 28 gTime for 28 g = 1600 yearHalf life of element = 1600 yearsHow to determine the timeWe'll begin by determining the number of half-lives that has elapsed. This can be obtained as follow:
Original amount (N₀) = 312 gAmount remaining (N) = 9.75 gNumber of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 312 / 9.75
2ⁿ = 32
2ⁿ = 2⁵
n = 5
Finally, we shall determine the time. This can be obtained as follow:
Half-life (t½) = 1600 yearsNumber of half-lives (n) = 5Time (t) =?t = n × t½
t = 5 × 1600
t = 8000 years
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What type of weathering occurs when acid rain changes rocks? A. erosion
B. deposition C. chemical weathering D. physical weathering
Answer:
c...................................
Can someone help me with my stoichiometry homework, it is due tonight.
Answer:
1. 1 mole of NaCl.
2. 1 mole of H₂O.
Explanation:
The balanced equation for the reaction is given below:
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
1 mole of HCl reacted with 1 mole of NaOH to produce 1 mole of NaCl and 1 mole of H₂O.
Next, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above, we can see that 1 mole of HCl reacted completely with 1 mole of NaOH. Therefore, HCl is the limiting reactant and NaOH is the excess reactant since we have 3.6 moles of NaOH.
1. Determination of the amount of NaCl produced from the reaction.
NOTE: The limiting reactant is used to determine the maximum amount produced since all of it is consumed in the reaction.
The limiting reactant is HCl and the amount of NaCl produced can be obtained as follow:
From the balanced equation above, we can see that 1 mole of HCl reacted to 1 mole of NaCl.
Thus, 1 mole of NaCl was produced.
2. Determination of the amount of H₂O produced from the reaction.
From the balanced equation above, it is evident that 1 mole of HCl reacted to produce 1 mole of H₂O.
Thus, 1 mole of H₂O was produced.
The density of water H20 is bout 1 g/ml. If u have a bottled water that is 500 ml how many grams is this
Answer:
500 grams
Explanation:
500 milliliters x 1 gram per millileter = 500 grams.
PLS HELP 6TH GRADE ITS ONE QUESTION ABOUT SCIENCE
Answer: The answer is C
Explanation:
Your answer would be C. :)
PLEASE HELP ME !!!!
The octet rule states that atoms tend to form bonds so that each atom has eight ________ in its _______
shell
Answer:
electrons..............
Answer:
electrons, outer
Explanation:
Which of the following may be a reason why climbing up objects would help the ivy survive?
What is the difference between an empirical formula and a molecular formula?
Answer:
The empirical formula simply states the ratios of the elements that make up the molecule, while molecular formulas specify the amounts of each element exactly, not just giving the ratio. Let's take ethane (C2H6) as an example.
Find the amount of water containing 14.02 * 10²⁴ molecules
Answer:
14.02 x 10²⁴ molecules
Explanation:
To solve this problem we will use Avogadro's number: It relates to the number of molecules (or atoms) contained in 1 mol of any given substance:
14.02 x 10²⁴ molecules ÷ 6.023 x 10²³ molecules/mol = 23.28 molesThus, 23.28 moles of water contain 14.02 x 10²⁴ molecules.
1 pt
Vanadium (V) is element 23 on the periodic table. A sample contains 2.88x1022 atoms of V. Calculate the amount of V.
1 pt
x mol V
1 pt
Resubmit
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What does it mean if a solution is a "weak acid "? Strong acid? Give logical ph values for each
Answer:
A weak acid is an acid that partially dissociates into its ions in an aqueous solution or water. In contrast, a strong acid fully dissociates into its ions in water. At the same concentration, weak acids have a higher pH value than strong acids.
Explanation:
:)
Mammals and plants do not belong in the same domain.
Fact:
Evidence:
False
Fact: Mammals and plants belong to the same domain, the Eukarya domain.
Evidence :All the organisms that possess a eukaryotic cell, plants, animals, protists, and fungi are in the Eukarya domain.
How many atoms would you find in 3.60 g of Boron?
Answer:
1.8 * 10^24 atoms
Explanation:
n = M(B) / m = 10.8 / 3.60 = 3 mol
N = n * Na = 3 * 6*10^23 = 1.8 * 10^24 atoms
Which phrases describe the oceans? Check all that apply.
cover more than 70 percent of Earth
provide oxygen for life on Earth
contain fresh water
constantly in motion
interact with other Earth systemsWhich was found to be unconstitutional based on the Supreme Court’s ruling in Scott v. Sandford?
Answer:
the first one is the answer
Answer:
Phrases that describe the oceans are
cover more than 70 percent of Earth
constantly in motion
interact with other Earth systems
Explanation:
What are the two most important properties of ocean water?
Two of the most important characteristics of ocean water are its temperature and salinity.
Why are the elements in group VIIIA unreactive?
They are all gases.
They have an even number of electrons in their outer shell.
They have a full outer shell of electrons.
They each have a stable nucleus.
Given a 6.80 g sample of H2O how many grams of oxygen is produced assuming the decomposition goes to completion
Answer:
6.0444g
the formula must be after balancingknown as 36(mass) of H2O can produce 32(mass) of O2so 6.80g of H2O can produce (x)g of oxygenAccording to the stoichiometry of the decomposition of water 6.04 grams of oxygen is produced assuming the decomposition goes to completion.
What is stoichiometry?Stoichiometry is defined as the determination of proportions of elements or compounds which are present in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical equations.According to the reaction, 36 g water gives 32 g oxygen thus 6.80 g water will give 6.80×32/36=6.04 g.
Thus, on decomposition of water 6.04 grams of oxygen is produced assuming the decomposition goes to completion.
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What is the freezing point of a solution of 498mL of water (solute) dissolved in 2.50 L of ethanol (solvent), C2H5OH? The density of C2H5OH is 0.789g/cm3. (Remember that water has a density of 1.0 g/cm3.)
Answer:
Freezing T° of solution is -142.4°C
Explanation:
This excersise is about colligative properties, in this case freezing point depression,
ΔT = Kf . m . i
Where ΔT = Freezing T° of solvent - Freezing T° of solution
Kf = Cryoscopic constant
m = mol/kg (molality)
i = Number of ions dissolved.
Water is not ionic, so i = 1
Let's find out m.
We determine mass of water, by density
498ml . 1 g/mL = 498 g
We convert the mass of water to moles → 498 g . 1mol/18g = 27.6 moles
We determine mass of solvent by density
2500 mL . 0.789 g/mL = 1972.5 g
Notice, we had to convert L to mL to cancel units.
1 cm³ = 1 mL
We convert the mass from g to kg → 1972.5 g . 1kg /1000g = 1.97kg
We determine m = mol/kg → 27.6mol / 1.97kg = 13.9 m
Kf for ethanol is: 1.99 °C/m
Freezing T° for ethanol is: -114.6°C
We replace at formula: - 114.6°C - Freezing T° solution = 1.99 °C/m . 13.9 m . 1
- 114.6°C - Freezing T° solution = 27.8 °C
- Freezing T° solution = 27.8°C + 114.6°C
Freezing T° Solution = - 142.4 °C
biology and physics are so closely related that sometimes the fields overlap. what experiment might both biologist and physicists do
Answer:
Study how the body's nerve cells react to an electrical shock.
Explanation:
Answer:
Study how the body's nerve cells react to an electrical shock.
Explanation:
a p ec
Why do you think males and children are more likely to die from DHMO
Answer:
Dihydrogen Monoxide (DHMO) is perhaps the single most prevalent of all chemicals that can be dangerous to human life. Despite this truth, most people are not unduly concerned about the dangers of Dihydrogen Monoxide. Governments, civic leaders, corporations, military organizations, and citizens in every walk of life seem to either be ignorant of or shrug off the truth about Dihydrogen Monoxide as not being applicable to them. In 1997, the Dihydrogen Monoxide Research Division was formed and went online spreading the truth about DIHYDROGEN MONOXIDE. As word has spread, so too has the public awareness of Dihydrogen Monoxide and its implications involving the Internet and accessibility of such information. To that end, the DMRD's web site at DHMO.org continues to provide the most comprehensive collection of Dihydrogen Monoxide information available anywhere.
Explanation:
DHMO has been the dihydrogen monoxide. It has been responsible for the death of males and children as it causes tissue damage.
The DHMO has been the hydric acid and is one of the major constituents of acid rain. Gas has been responsible for greenhouse gas. Ingestion may lead to tissue damage with symptoms of nausea, vomiting, and electrolyte imbalance.
The companies dumping waste in the rivers and lakes have been warned for the removal of DHMO as it has been harmful to the males and children, and results in death.
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What is the proper name for the chemical formula Cl4O5?
Answer:
Carbon tetraiodide
Explanation:
let me know if it works
1. How many moles does 24 g of Mg contain?
Explanation:
1 mole Of atom = GAM
MG=24g
GAM of Mg=24g
Therefore 24g=mole
Not My answer But I saw That You needed it.
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industrial gases cause acid rain why
because the industrial gas is very harmful for us it is made up chemical and toxic gases
Answer:
The usual culprit is burning coal.
Explanation:
This produces a lot of carbon dioxide as well as sulphur dioxide. Other industrial processes, and vehicle emissions, produce similar oxides unless they are 'scrubbed' out. They react with atmospheric moisture to produce acids like carbonic, sulphurous and nitrous acids. Which is then precipitated. It should be remembered that a volcanic eruption has this effect too.
20 POINTS!!
__________ aid the immune system in mounting attacks against cancer cells by targeting antigens only found on the surface of cancer cells.
A. Monoclonal antibodies
B. Interferons
C. CRISPR
D. Vaccines
E. Interleukins
Answer:
B. Interferon
Explanation:
interferon targets any lingering melanoma cells and prevents them from spreading and growing.
which statement best explains why chlorine is added to drinking water? A. Chlorine cures infections caused by bacteria or other microorganisms B. Chlorine protects people teeth against cavities C. Chlorine prepares the body to fight future infections D. Chlorine kills most pathogens in water
Answer:
to protect peoples teeth against cavities
Explanation:
i just know
Answer: its D
Explanation: A.P.E.X.
Which statement about copper, diamond, and silicon(IV) dioxide is correcta)Copper and silicon(IV) dioxide have similar electrical conductivityb)In diamond the carbon atoms are covalently bonded as flat sheetsc)In silicon(IV)dioxide the silicon and oxygen atoms are covalently bonded in flat sheetsd)The structure of copper includes a lattice of positive ions
Answer:
In diamond the carbon atoms are covalently bonded as flat sheets
In silicon(IV) dioxide the silicon and oxygen atoms are covalently bonded in flat sheets
The structure of copper includes a lattice of positive ions
Explanation:
Diamond and silicon(IV) dioxide are covalent network solids. Covalent network solids are made up of atoms joined to one another by covalent bonds to form a giant lattice, The solids are hard and have a very high melting point. They do not conduct electricity. So, for both diamond and SiO2, atoms are covalently bonded to yield flat sheets in a covalent bonded network solid.
Copper is a metallic substance having metallic bonds, a metallic crystal consists of positive ions and a cloud of electrons.
the stimulus is related to?
Answer:
The government :) lol
Explanation:
H3PO4 + HCI
PCI5+H2O
Answer:
Balanced Chemical Equation:
H3PO4 + 5HCl → PCl5 + 4H2O
Which type of cell is associated with the statements below? Fill in the blank with either (voltaic cell, electrolytic cell, both).
Non-spontaneous reaction occurs:
Spontaneous reaction occurs:
Oxidation occurs at anode:
Electrolyte supports electron flow:
Answer:
Non-spontaneous reaction occurs: electrolytic cell.
Spontaneous reaction occurs: voltaic cell
Oxidation occurs at anode: both
Electrolyte supports electron flow: both
Explanation:
Choose the formula for calculating percent composition.
Answer:
The equation for percent composition is (mass of element/molecular mass) x 100.
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The equation below represents the process that you observed. Balance the equation. What type of reaction?
6CO2 + 6H2O + light energy = 0C6H12O6 + 6O2 _______________________
Answer:
Explanation:
6CO2 + 6H2O = 0C6H12O6 + 6O2
First you note how much u got of everything in front of and behind the arrow
C 6 C 6
O 6 + 12 = 18 O 6 + 12 = 18
H 12 H 12
As you can see, the equation is already balanced.
This is the equation of photosynthesis, which is a chemical reaction
What is the difference between fumarate and fumaric acid?
Answer:
the difference is fumaric acid the carboxylic acid groups are trans (E) and in maleic acid they are cis (Z)
Explanation:
and Fumarate is an intermediate in the citric acid cycle used by cells to produce energy in the form of adenosine triphosphate (ATP) from food