After decaying for 48 hours, of the original mass of a radioisotope sample remains unchanged. The half-life of this radioisotope is zero.
Describe a half-life.
The half-life is basically the amount of time it takes for one-half of a radioactive isotope to decay. The half-life of a single radioactive isotope is unaffected by environmental factors and is independent of the isotope's initial concentration.
Half-life is a unit of measurement for the exponential decay equation that remains constant over the lifespan of an exponentially decaying quantity. The half-life of a quantity is the time required for it to decrease to half of its initial value. The phrase is frequently used in nuclear physics to indicate how quickly unstable atoms decay radioactively or how long stable atoms last.
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Are magnesium and calcium more reactive with oxygen in the air than aluminum?
Answer:
Yes
Explanation:
In the activity or reactivity series of metals it turns out that calcium and magnesium are above aluminium
Reviewing Vocabulary
Answer:
Plasma - state of matter consisting of freely moving icons and electrons
Differentiate - to distinguish between two or more objects
Ion - atom or molecule with a net electric charge
Primary - most important; fundamental
Assume that 41. 1g of hydrogen peroxide decompose to produce oxygen gas at STP to the following balanced equation:
2H2O2 (l) ---------> 2H2O(l) + O2 (g)
How many Liters of oxygen gas are produced?
At STP, 1 mole of any gas occupies a volume of 22.4 liters. In order to calculate the amount of oxygen gas produced in the reaction, we must first calculate the number of moles of hydrogen peroxide present in the reaction.
Since 1 mole of hydrogen peroxide has a mass of 34.02 g, we can calculate the number of moles as follows:
41.1/34.02 = 1.20 molesSince the reaction produces 1 mole of oxygen for every 2 moles of hydrogen peroxide, the total number of moles of oxygen produced is 1.20/2 = 0.60 moles.
To calculate the volume of the oxygen gas produced, we multiply the number of moles of oxygen by 22.4 liters, which gives us 0.60 * 22.4 = 13.44 liters of oxygen gas produced.
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If chemicals are transferred to secondary containers the secondary containers must be labeled with.
The secondary container must be marked with the name of the chemical and any hazards it may provide when a substance containing a hazardous chemical is moved from the primary container to the secondary container.
Define a secondary label.
The product's components, nutritional values, health and safety warnings, use instructions, manufacturer or supplier data, contact information, or comprehensive tracking and product information in a barcode format are all included on a secondary label.
The identity of the hazardous chemical contained in the product and the dangers, whether physical, health-related, or environmental, that the components present must both be disclosed on the secondary labels.
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The statement below is false. How
must it change to correct it?
"The gas particles have a large volume
and weak attraction for one another.
A. The gas particles have strong
attraction for one another.
B. The gas particles have almost no
volume.
C. The gas particles have small volume
and strong attraction for one another.
Answer:
A. The gas particles have strong attraction for one another.
Explanation:
The gas particles have a large volume and weak attraction for one another. To correct this statement and make it true, it should be: "The gas particles have a small volume and weak attraction for one another." Gases have large volume, and low density and the particles in a gas are far apart from one another and have very weak attractive forces between them.
Answer: B. The gas particles have almost no
volume.
Explanation:
How do I balance this?
C12H22O11 (s) + 12O2 (g) ⇒ 12CO2 (g) + 11H2O (g)
What share of modern renewable energy supplies does hydroelectric power account for?.
The shares of modern renewable energy supplies in the Hydroelectric power is 22%.
The Hydropower technologies generate power by using the elevation difference created by a dam or diversion structure of water flowing. The Hydropower is the affordable source of electricity that costs less than others. Hydropower relies only on the energy from moving water. As compared to other electricity sources, hydropower has relatively low costs throughout in terms of maintenance, operations, and fuel. Hydropower's have longer lifespan with low costs. It is a reliable form of backup power during major electricity outages or disruptions. Hydroelectric power produces a number of benefits outside of electricity generation such as flood control, irrigation support, and water supply.
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what is the percent yield if 18 grams of water are produced when 4 grams of hydrogen with excess oxygen?
The 4% is the percent yield if 18 grams of water are produced when 4 grams of hydrogen with excess oxygen.
What is hydrogen ?
Protium, a proton and a neutron, is the common isotope of hydrogen (H), while Deuterium and tritium are the other two isotopes (a protron and two neutrons). Only hydrogen has had its isotopes given distinct names among all the elements. For fuel in nuclear fusion reactors, both deuterium and tritium are employed.
What is oxygen ?
It is ingested by animals, who then convert it to carbon dioxide, which is then used by plants to create new carbon and release oxygen back into the atmosphere.
2H2++O2------------->2H2O.
So 32g of Oxygen reacts with 4 g of Hydrogen.
Therefore 16 g of oxygen reacts with 2 g of Hydrogen and will form 18 g of water.
The remaining 2 g of Hydrogen will be left unreacted. So 18 g of water will be formed and 2 g of Hydrogen will be left unreacted.
Therefore, 4% is the percent yield if 18 grams of water are produced when 4 grams of hydrogen with excess oxygen.
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oxides of active metals, such as cao, react with water to form____
The oxides of active metals react with water to form metal hydroxides.
An active metal reacting with water produces a base. The first group of elements in the reactivity series is the most reactive metals. When they react with water, the plus charge on the metal is canceled by the negative charge of the hydroxide ion. Hence, there is a formation of the basic oxide.
Compounds such as calcium oxide (CaO) reacts with water to form calcium hydroxide. It is commonly known as slaked lime which is the end product of this process.
This is a type of combination reaction. Combination reactions are the types of reactions in which two reactants combine to form a new product and also release heat energy during the reaction.
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Balance the equation
____Sb + ____O2 ---> ____Sb4O6
Answer:
2Sb2O3 + 3O2 -> 2Sb4O6
The coefficients indicate the number of moles of each element that participate in the reaction. The coefficients are chosen so that the number of atoms of each element on both sides of the equation is equal.
Blood alcohol content (bac) is sometimes reported in weight-volume percent and, when it is, a bac of 0. 10% corresponds to 0. 10 g of ethyl alcohol per 100 ml of blood. In many jurisdictions, a person is considered legally intoxicated if his or her bac is 0. 10%. Suppose that a 68 kg person has a total blood volume of 5. 4 l and breaks down ethyl alcohol at a rate of 10. 0 grams per hour. How many 145 ml glasses of wine, consumed over three hours, will produce a bac of 0. 10% in this 68 kg person? assume the wine has a density of 1. 01 g/ml and 11. 5% ethyl alcohol by mass.
2 , 145 ml glasses of wine, consumed over three hours, will produce a bac of 0. 10% in this 68 kg person.
What Is Blood Alcohol Concentration (BAC)?
The quantity of alcohol in a person's bloodstream is known as blood alcohol content, or BAC, and it can be determined 30 to 70 minutes after ingestion. Contrary to common opinion, coffee, cold showers, and downing glasses of water won't help you sober up any faster. The only thing that can lower BAC is time.
Given, 68kg person
5,4L blood i.e. 5400ml
Breaks down ethyl alcohol at a rate of 10. 0 grams per hour
To produce a bac of 0. 10% in this 68 kg person over three hours,
(0.10g/100ml)*5400ml + (10g/h *3h) i.e. 30.54g of ethyl alcohol
For a 11,5% of wine ,
Where density of ethyl alcohol is 1.01g/mL:
30.54*(1/1.01)*(100/11.5) i.e. 262.909mL wine
Therefore, he need to consume:
262.909/145 i.e. 1.8 ≈ 2 glasses of wine
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How many molecules are in 1. 8 g of H2O?.
There are approximately 6.022 x 10^22 (6.022 x 10²²) molecules in 1.8 grams of H2O.
To determine the number of molecules in 1.8 g of H2O, we first need to know the molar mass of H2O. The molar mass of H2O is 18.015 g/mol. To convert the mass of H2O to moles, we divide it by the molar mass:
1.8 g H2O / 18.015 g/mol = 0.1 mol H2O
Next, we use Avogadro's number (6.022 x 10^23) to convert moles to number of molecules:
0.1 mol H2O x 6.022 x 10^23 molecules/mol = 6.022 x 10^22 molecules
So, there are approximately 6.022 x 10^22 (6.022 x 10²²) molecules in 1.8 grams of H2O.
It is worth noting that, 1 mole of any substance contains Avogadro's number of entities of that substance. And Avogadro's number is a fundamental constant of nature which is used to express the number of atoms, ions, or other elementary entities in a given sample of a substance.
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the three different gas-law processes described in this video are___
The three different gas-law processes described in this video are constant volume, constant pressure, and constant temperature.
Constant volume, constant pressure, and constant temperature, these are also known as isochoric, isobaric, and isothermal processes respectively. In an isochoric process, the volume is held constant, meaning that the pressure and temperature of the gas will change. In an isobaric process, the pressure is held constant, meaning that the volume and temperature of the gas will change. In an isothermal process, the temperature is held constant, meaning that the volume and pressure of the gas will change. Each of these processes is related to a specific gas law and can be used to understand and predict the behavior of gases under different conditions.
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