The amount, in grams, that will remain of the isotope will be 2.75 grams
Half-lifeIt is the time it takes for a given amount of radioactive substance to decay into half of its original amount.
The half-life is 15 hours. This means that the amount is halved every 15 hours.
If the starting amount is 22 grams, it will become 11 grams (22/2) after the first 15 hours. The 11 grams will become 5.5 grams (11/2) after another 15 hours, making 30 hours.
The 55.5 grams remaining will become 2.75 grams (5.5/2) if another 15 hours should pass, making a total of 45 hours that have passed.
Thus, only 2.75 grams of the isotope will remain in 45 hours.
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organic compounds and their uses
Even when it is cold outside, the human body maintains an internal temperature of 37C. Which term describes the maintenance of a stable internal condition?
A. mitosis
B. homeostasis
C. endocytosis
D. photosynthesis
How do you assume the help position to reduce heat loss in cold water?.
Crossing your arms across the chest and pulling the knees up to your chest is how the HELP position is achieved.
What is HELP position?This is referred to as heat escape lessening position and reduces heat loss in individuals when in cold water.
This position helps to protect groin, head/neck, and rib cage/armpits areas of the body.
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There are 75.0 g of glucose (molar mass = 180 g/mol) dissolved in 250 mL of solution. What is the molarity of this solution?
A. 0.416 M
B. 1.70 M
C. 2.13 M
D. 3.31 M
Answer:
5.6 m which is molarith this solution
how do electrostatic forces affect the electrons in an atom?
Answer:
allows the atoms of different elements to bond together to form new substances
The negatively charged electrons are held together by electrostatic force by the positively charged atomic nucleus.
What is electrostatic forces?Electrostatic forces are non-contact forces that pull or push on objects without contacting them.
The positively charged atomic nucleus holds the negatively charged electrons together with electrostatic force.
Thus, in this way electrostatic forces affect the electrons in an atom.
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How many esters with the molecular formula C₂H₁O₂ can be made by reacting a primary alcohol with a carboxylic acid? A 4 B 5 C6 D 8
Answer:
your answer is c- 6 esters
Predict: suppose you began with 8 moles of no2 in the chamber. what do you think will happen if you let the reaction go for a long time?
The protraction of this reaction would over time lead to attainment of equilibrium and appearance of N2O4.
What is equilibrium?The term equilibrium refers to the point where the forward and the reverse reactions proceed at the same rate.
Hence, the reaction will reach equilibrium if the reaction continues for a long time, then some N2O4 molecules will begin to appear in the system.
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compare molecular & covalent network crystal solid?
Answer:
Molecular solids and covalent network solids are two types of solid compounds. The key difference between molecular solid and covalent network solid is that molecular solid forms due to the action of Van der Waal forces where as covalent network solid forms due to the action of covalent chemical bonds.
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What is the volume of a sample of mercury, a liquid metal, if it has a density of 14 g/ml and a mass of 28 g?
Describe the properties of alkaline earth metals. Based on their electronic arrangement, explain whether they can exist alone in nature.
The properties of alkaline earth metals include
highly metallic and good conductors of electricity.What are alkaline earth metals?Alkaline earth metals are the metals that occupies the group two in the periodic table. They include the following:
beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).The properties include the following:
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Answer:
Alkaline metals have valency 2, they have 2 valence electrons, their oxides are basic in nature, and they are electropositive. Alkaline metals are not found in nature alone.
Explanation:
A 1600 watts electric oven is used for 9 hours. Calculate the Cost of using the #3.00 per unit of of energy (Energy consu- med = power x time). What are the functions of the ammeter and Voltmeter ? Solution ( (A
The cost of using 14,400 watts hour would be $43.2.
What is Energy ?Energy is defined as the capacity to do work.
It is given in the question that
A 1600 watts electric oven is used for 9 hours
Power * Time
power = 1600 watts
Time = 9 hours
Total energy consumed = 1600 watts * 9 hours
= 14,400 watts hour
energy is measured in Kilowatts hour
= 14,440 watts hour
14,440/1000 kwh
= 14.4 kwh
It is given that the cost per unit of energy is $3.00 per kwh
Therefore , the cost of using 14,400 watts hour would be 14.4 * 3
= $43.2
The function of Voltmeter and Ammeter is to measure Voltage and Current respectively.
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which element have 6 valence electrons?
Answer:
D. Selenium
Explanation:
If you are talking about elements with a neutral charge, i.e. just usual elements and not ions whatsoever, then we have five elements who match the criteria. They are oxygen (o) sulfur (s) selenium (se) tellurium ( T e ) polonium ( P o )
A group of organisms of the same species that live in an area is called a(n
A population is a group of individuals of the same species living in a particular area at the same time.
What is the population?The whole number of people or inhabitants in a country or region.
A population is the number of living people that live together in the same place. A city's population is the number of people living in that city. These people are called inhabitants or residents. The population includes all individuals that live in that certain area.
Hence, a group of organisms of the same species that live in an area is called a population.
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Exposure to even small amounts of radiation may cause
Predict the final temperature of 3.50 kg of water in a calorimeter if the water is at 27.5°C before 0.77 oz of noodles containing 81.0 kcal are burned
The final temperature of the water is determined as 50.55 ⁰C.
Final temperature of the waterThe final temperature of the water is determined from the following calculations;
Q = mcΔθ
Δθ = Q/mc
where;
Q is the amount of energy = 81 kcal = 338904 Jc is specific heat capacity of water = 4,200 J/kgCΔθ = 338904 /(3.5 x 4200)
Δθ = 23.05 °C
Final temperature = T₁ + Δθ
Final temperature = 27.5°C + 23.05 °C = 50.55 ⁰C.
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An element in Group 6A (16), period 3 would have which of the following properties?
An element in group 6A, period 3 with an atomic number of 16 would be brittle in nature.
BrittlenessBrittleness is the characteristic of a substance to break easily when hit with an object or against an object.
The element with the atomic number 16 is sulfur. Sulfur does not conduct heat nor electricity and neither can it be turned into wire.
Sulfur exists naturally as a brittle solid that is yellow in appearance.
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What determines whether or not a reaction is spontaneous?
Answer:
The two factors that determine whether a reaction is spontaneous are:
Enthalpy: When the reaction gives off energy, then the reaction is said to be spontaneous.
Entropy: It is the measure of randomness in a system. As the randomness of the reaction increases, the spontaneous is the reaction.
That's it
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What is the molarity of a solution that contains 0.25 mole of solute in 0.50 l of solution?
Answer:
2.0 M
Explanation:
molarity = (moles of solute)/(liters of solution)
molarity = 0.25/0.50 = 2.0 M
Question 6: The Ideal Gas Law (7 points) a. What is the mathematical equation for the ideal gas law? Identify each variable and give its units. (2 points) b. Match the special cases of each gas law with its description. A law may be used more than once. In the equations, k is a constant. (3 points)
The mathematical equation for the ideal gas law is PV = nRT.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
(A)
PV = nRT
The ideal gas equation is formulated as: PV = nRT. In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.
(B)
Where the pressure - P, is in atmospheres (atm) the volume - V, is in liters (L) the moles -n, are in moles (m) and Temperature -T is in Kelvin (K) as in all gas law calculations.
(C)
A. Boyle's law
B. Charles's law
C. Avogadro's law
D. Dalton's law
____ [tex]- P_1V_1[/tex] = [tex]P_2 V_2[/tex]
____ [tex]\frac{V}{T}[/tex] = k
____ [tex]\frac{V_1}{T_1}[/tex] = [tex]\frac{V_2}{T_2}[/tex]
____ V = kn
____ PV = k
____- P total = [tex]P_1 + P_2 + P_3 + ...[/tex]
Boyle's law [tex]- P_1V_1[/tex] = [tex]P_2 V_2[/tex]
Charles's law - [tex]\frac{V}{T}[/tex] = K
Charles's law - [tex]\frac{V_1}{T_1}[/tex] = [tex]\frac{V_2}{T_2}[/tex]
Avogadro's law- V = kn
Boyle's law - PV = k
Dalton's law - P total = [tex]P_1 + P_2 + P_3 + ...[/tex]
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Pls show working too... thanks!!
The maximum volume of hydrogen evolved at room temperature and prressure after taking excess zinc with 0.01 mol HCl is 2.4 [tex]dm^{3}[/tex]
hence correct option is (C)
What is Ideal gas law ?According to this law, the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.
Given Equation ;
Zn + 2HCl --> [tex]ZNCl_2[/tex] + [tex]H_2[/tex]
Given Quantities ;
Amount of Zinc = Excess
Amount of 1.0 mol/ltr HCl = 100 ml
It means, Number of moles of H = 0.1 mole
Temperature = 298 K
Pressure = 1 Atm
This is a “single state” problem, so we can solve it using the ideal gas law, PV = nRT.
therefore, using Ideal gas equation ;
PV=nRT
1 x V = 0.1 x 0.0821 x 298
volume of hydrogen gas = 2.4 litre ie, 2.4 [tex]dm^{3}[/tex]
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Explain how to calculate the number of grams in 5.50 x 1022 atoms.
Answer:
See below
Explanation:
From periodic table, find Mole Weight of the element in question
this is the grams of the element in Avagadro's Number (6.022 x 10^23) of atoms
(5.50 x 10^22) / (6.022 x 10^23) x mole weight = grams
“Kids and grown-ups love it so, the happy world of HARIBO!” Who does not like the dark brown liquorice and its lovely taste?! Tasty above all is the liquorice-plant. As another ingredient “ammonium chloratum” very often is used as an acidifier. This name is apothecary’s jargon and the old chemical name of ammonium chloride (NH4Cl).
Ammonium chloride, also known as “salt of salmiak”, is allowed up to 20 g/kg in liquorice by the nutrition laws.
Ammonium chloride can be produced from ammonia (NH3) and hydrogen chloride (HCl). You are a student trainee with HARIBO’s. Suddenly the machine in which the ammonia and the hydrogen chloride are combined and added to the liquorice sounds the alarm, but your boss is in his office on an urgent telephone call and does not want to be interrupted. The valves controlling the doses of ammonia and hydrogen chloride have to be adjusted. You have to act quickly. It is very important not to overdose the ammonium chloride, because its amount in the liquorice is controlled regularly by an independent supervision agency.
The machine produces ammonium chloride for a thousand bags of 200 g liquorice each.
Answer:
Any Questions?
So i can give you the answer
It was experimentally determined from three trials that an object had a density of 0.96, 0.99, and 0.95 g/mL. What is the average density and standard deviation of this object
The mean of the sample is 0.97 while the standard deviation of the sample is 0.015.
What is the average density?The average density is the sum of the density values divided by the total number of measurements.
In this case, we have three trials, the mean of the samples is [tex]0.96 + 0.99 +0.95/3 = 0.97[/tex]
The standard deviation is obtained from;
s= [tex]\sqrt{(0.96 - 0.97)^2 + (0.99 - 0.97)^2 + (0.95 - 0.97)^2/(3 - 1)}[/tex]
s = [tex]\sqrt{(0.0001) + (0.0004) + (0.0004)/2}[/tex]
s = 0.015
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Determine the charge for each of the following. Please help
Determine the unknown mineral using the information given below. Be sure to use significant figure rules when doing calculations. Mass is shown on the triple beam. Scale Test Mineral Mineral H. Density, g/cc 10 diamond tellurium 2 2.07 9 corundum galena 2.5 7.58 8 topaz anglesite 2.5 - 3 6.4 7 quartz chalcocite 2.5 - 3 5.6 6 feldspar copper 2.5 - 3 9.0 5 apatite gold 2.5 - 3 19.3 4 fluorite silver 2.5 - 3 10.5 3 calcite arsenic 3.5 5.7 2 gypsum barite 3 - 3.5 4.4 1 talc dolomite 3.5 - 4 2.9 platinum 4.5 21.5 willemite 5.5 4.0 magnetite 6 5.18 pyrite 6 - 6.5 5.02 pyrolusite 6 - 6.5 5.0 cassiterite 6.5 6.9 diamond 10 3.52 Volume of water displaced = 0.051 L
Mass: 981.0, 908, 908.1, 981 g
Density: 192.35, 19,235, 19, 19.2 g/cc
Hardness 4, 2.5, 1, 3, 5.5 - 5, 3, 2, 4.5, 1.5
Determine the unknown mineral.
Platinum, Gold
The unknown mineral is gold because of the similar properties of gold to that unknown mineral.
What is unknown mineral?The unknown mineral is Gold because it has similar properties to the gold. Gold has density of 19.3 grams per cubic centimeter which is same to this unknown mineral. The hardness and mass of the mineral are also similar to the Gold.
So we can conclude that the unknown mineral is gold because of the similar properties of gold to that unknown mineral.
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Boxes on trees in swamps give wood ducks a place to build their nests platforms built on top of telephone poles provide a place for eagles to make their nests
in backyards and parks, people may set up houses for bats, birds, or toads how do these artificial homes affect resources in the animal's environments? how
does this in turn affect population size?
These artificial homes preserve the resources in the animal's environment and increases population size.
What is Population size?This is defined as the number of organisms in a population at a given place and time.
Since the resources used are artificial, they are preserved with an increase in the population due to reproduction.
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Determine the percentage composition of Ptl2
Answer:
Percent Composition
1. Find the molar mass of all the elements in the compound in grams per mole.
2. Find the molecular mass of the entire compound.
3. Divide the component's molar mass by the entire molecular mass.
4. You will now have a number between 0 and 1. Multiply it by 100% to get percent composition.
Is decay pool or flux
Answer:
A single carbon pool can often have several fluxes both adding and removing carbon simultaneously. For example, the atmosphere has inflows from decomposition (CO2 released by the breakdown of organic matter), forest fires and fossil fuel combustion and outflows from plant growth and uptake by the oceans.
Explanation:
1. How many moles of nitrogen are there in 4.3 × 1023 molecules?
Answer:
0.714 moles
Explanation:
whenever you see × 10^23 molecules
its an Avogadro's number question
Avogadro's number is 6.02214076×10²³
1 mole is 6.02214076×10²³ molecules
4.3 × 10²³ molecules divided by 6.02214076×10²³ molecules per mole =
4.3 × 10²³ ÷ 6.02214076×10²³ =
0.71403179888 moles
socraticorg
Given the following generic chemical reaction , which is the reactant ?
Answer:
X
Explanation:
X is the reactant and Y is the product