How many half-lives of time have passed when only a little more than 3% of a sample
original C-14 remains?
Answer:
5.06 half lives
Explanation:
1/2 ^n = .03 (.03 is 3% in decimal)
log both sides
n log 1/2 = log .03
n = 5.06 half lives
2)a dish contains a blackish-yellow powder.when a magnet is moved over it black particles iron get stuck to the magnet and only yellow powder which is sulphur is left behind. was your original powder an element compound or mixture
can you treat a sulfuric acid burn with sodium hydroxide
Answer:
I think yes
Explanation:
sorry i havent done these type a questions in a while
Part g
consider the melting points of sugar and salt, as well as the states of sugar, salt, and oil
at room temperature. what can you conclude about the attractive forces between
particles in the three substances?
Salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.
What type of attractive forces present in salt, sugar and oil?The attractive forces between particles in the salt and sugar substances have strong because of its solid state while on the other hand, the attractive force between particles of oil is weak because of its liquid state.
So we can conclude that salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.
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The strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.
What is melting point of a substance?The melting point of a substance is the temperature at which the solid substance melts.
The melting point of a substance is a constant for a pure substance.
The higher the attractive forces between the molecules of a substance, the higher the melting point will be.
Between the three substances, oil has the lowest melting point while salt has the highest melting point.
Therefore, the strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.
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The pH of a solution is 0.50. To two decimal places, what is the hydrogen ion concentration of that solution
Explanation:
pH= –log¹⁰[H+]
0.50= –log¹⁰[H+]
log¹⁰[H+]=0.50
take the antilog of 0.50
[H+]= 3.16moldm-³
Somebody please help meeeeeeeeee!! (The question is underneath the table)
Answer:
1.)
Parent 1:
Ff (genotype) and free earlobes (phenotype)
Parent 2:
ff (genotype) and attached earlobes (phenotype)
2.)
Ff and ff (possible genotypes)
Free earlobes and attached earlobes (possible phenotypes)
Explanation:
Phenotypes are the observable traits an organism displays.
Genotypes are the genetic sequences organisms' possess that code for particular traits.
I am assuming that heterozygous individuals (Ff) display the dominant trait (free earlobes). As such, one parent has the Ff genotype and the free earlobe phenotype. The other parent has the recessive genotype (ff) and phenotype (attached earlobe).
50% of the children will have the same genotype and phenotype of one parent and the other 50% will have the same genotype and phenotype as the other parent.
None of the children will have the completely dominant genotype (FF).
2.58g of a gas has a volume of 3.97L at 745 mmHg and 21°C determine the molar mass of the gas what might be? ( first find n from the ideal gas law equation; then plug it into N = m/M or M = m/n)
The molar mass of the gas with the given mass and volume at the given temperature and pressure is 16.00g/mol.
What is the molar mass of the gas?From the Ideal gas law or general gas equation;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )
Given that;
Temperature T = 21°C = (21 + 273.15)K = 294.15KPressure P = 745 mmHg = (745/760)atm = 0.98026atmVolume of the gas V = 3.97LMass of gas m = 2.58gAmount of gas n = ?First, we determine the amount of gas;
PV = nRT
n = PV / RT
n = ( 0.98026atm × 3.97L ) / ( 0.08206 Latm/molK × 294.15K )
n = 3.8916Latm / (24.137949Latm/mol)
n = 0.1612mol
Molar Mass = Mass of the gas / Amount of the gas
Molar Mass = m / n
Molar Mass = 2.58g / 0.1612mol
Molar Mass = 16.00g/mol
Therefore, the molar mass of the gas with the given mass and volume at the given temperature and pressure is 16.00g/mol.
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Why is the spectrum from our sun a combination of spectral types?.
The price of a gallon of almond milk increases from $5 to $10, so people start buying more oat milk as an alternative. this causes a shift to the left in the demand for almond milk. demand for almond milk ____________ because of a change in ___________.
The demand for almond milk decreases because of a change in price from $5 to $10. Details about demand can be found below.
What is demand?Demand refers to the amount of goods a consumer is willing and able to buy at a given price and at a particular time.
Several factors can affect the demand of a particular good. According to this question, the price of a gallon of almond milk increases from $5 to $10, so people start buying more oat milk as an alternative.
Therefore, it can be said that the demand for almond milk decreases because of a change in price from $5 to $10.
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Answer:
decreased:related goods
Explanation:
ik it seems like decreased:income but i just took the test twice and ik for a fact its c not d
please ill mark u brilliant
+ 10 points
20.4 L of 0.650 M HCI reacts with 36L of KOH solution of unknown concentration. What is the molarity of the KOH solution?
Answer: 0.37 M
Explanation:
[tex]M_{A}V_{A}=M_{B}V_{B}\\(20.4)(0.650)=M_{B}(36)\\M_{B}=\frac{(20.4)(0.650)}{36}=\boxed{0.37 \text{ M}}[/tex]
A gas has a volume of 0.550 l at a temperature of -55.0 c. what will the volume be if the temperature is increased to 30.0 c and the pressure remains constant?
Gay-Lussac's law: [tex]\frac{V1}{T1}[/tex]=[tex]\frac{V2}{T2}[/tex]
We need to convert temperature from Celsius to Kelvin
-55 C = 218 K
30 C = 303 K
V2 = V1*T2 / T1 = 0.550 *303 / 218 = 0.764 l
Cleaning PDB from the test tube after the experiment could be a long and arduous process. Describe the procedure that you will use to clean PDB (and the unknown solid) from your test tube after your experiments are complete.
The unknown solid is removed by rinsing with water while the PDB is removed by rinsing with alcohol.
What are solvents?Solvents are substances which dissolve other substances to form solutions or mixtures.
Water is used as a solvent for inorganic substances while organic solvents such as alcohol or kerosene are used as solvents for organic substances such as PDB.
Alcohol is added to the test tube containing PDB, which then dissolves. The tube is rinsed with more alcohol until all the PDB dissolves.
Therefore, the unknown solid is removed by rinsing with water while the PDB is removed by rinsing with alcohol.
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Which of the following is true for the equilibrium constant of a reaction? (5 pc
OIts value remains constant at different temperatures.
It is a ratio of coefficients of reactants to products.
It is represented by the symbol K.
Its value is always less than 1.
The equilibrium constant of the reaction is represented by the symbol K. Thus, option C is the correct and accurate statement about the equilibrium constant.
What is the equilibrium constant?The equilibrium constant is a representation of the concentration of the products and the reactants of the reaction that is raised to the powers through their stoichiometry coefficient.
Its value varies and changes at different temperatures and is not always less than 1. The equilibrium constant is the ratio of the coefficient of the products to reactants.
Therefore, option C. equilibrium constant is represented by K is true.
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In general the formation of a chemical bond lowers the _____ energy of a chemical system, leading to a _____ stable arrangement.
In general, the formation of a chemical bond lowers the potential energy of a chemical system, leading to a more stable arrangement.
What is potential energy?Stored energy depends upon the relative position of various parts of a system.
In bond formation, atoms lose their potential energy to attain stability and heat is evolved. The bond formation is an exothermic reaction.
Atoms bond together to form compounds to attain lower energies than they possess as individual atoms.
A quantity of energy is equal to the difference between the energies of the bonded atoms and the energies of the broken atoms.
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What is the nuclear equation for decay of Am - 241
Americium is a radioactive element .
It goes through alpha decay during nuclear reactions .The nuclear reaction.is given by
[tex]\rm {}^{241}_{95}Am\longrightarrow {}^{237}_{93}Np+{}^4_2\alpha[/tex]
Np stands for NuptuniumHere alpha can be written as He too
Would the following be an example of a physical or a chemical change?
- Methane (natural gas) is combined with oxygen to produce heat.
Select one:
a. chemical
b. physical
c. neither
it is chemical change because chemical change occur when bonds are broken or formed between molecules or atoms.
A balloon containing 0.500 mol ar at 0.00°c and 65.0 kpa pressure is expanded by adding more argon. formula: pv = nrt (r = 8.317 l•kpa/mol•k) what is the original volume of the gas? l
The original volume of the gas would be 17.45 L.
Ideal gas equationFor an ideal gas:
PV = nRT, where P = pressure, V= volume, n = number of moles, T=temperature, and R = constant = 8.317 l•kpa/mol•k
In this case, n = 0.500 mole, T = 273K, P = 65.0 kpa.
Thus: V = nRT/P = 0.5 x 8.317 x 273/65 = 17.45 L
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2. suppose you added 40 ml of water to your vinegar sample instead of 20 ml. would the titration have required more, less or the same amount of naoh solution for a complete reaction? explain.
The titration would require the same amount of NaOH.
Number of moles and dilutionThe number of moles of solute in a solution remains the same irrespective of the amount of water added to dilute the solution.
This is in accordance with the dilution law which says that the number of moles of a solution before dilution is the same as after dilution.
Thus, the amount of NaOH needed to neutralize the vinegar will remain the same for a complete reaction since the number of moles of solute in the vinegar has not changed.
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calculate the mass of 3.5 moles of copper sulphate
Answer: 558.5545 g
Explanation:
The formula for a sulphate ion is [tex]\text{SO}_{4}^{\text{ }2-}[/tex], so the formula for copper sulphate is [tex]\text{CuSO}_{4}[/tex].
The atomic mass of copper is 63.546 g/mol.The atomic mass of sulfur is 32.065 g/mol.The atomic mass of oxygen is 15.994 g/mol.This means the formula mass of copper sulphate is:
63.546+32.065+4(15.994)=159.587 g/mol.So, in 3.5 moles, the mass is (159.587)(3.5)=558.5545 g
O2- is the Lewis ______ in the following reaction
SO3(g) + O2-(aq) —> SO4^2-(aq)
A. Acid
B.base
[tex]O^{2-}[/tex] is the Lewis base in the following reaction:
[tex]SO_3(g) + O^{2-}(aq)[/tex] → [tex]SO_4^{2-}(aq)[/tex]
What is lewis base?Lewis base is a species that donates an electron pair.
In the above-given chemical equation, the [tex]O^{2-}[/tex]is the lewis base which is donating an electron pair to the central atom of [tex]SO_3[/tex] to form [tex]SO_4^{-2}[/tex].
Hence, [tex]O^{2-}[/tex] is the Lewis base in the following reaction:
[tex]SO_3(g) + O^{2-}(aq)[/tex] → [tex]SO_4^{2-}(aq)[/tex]
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moles
5.
A mixture of gases at a total pressure of 105 kPa contains N2, CO2, and O2. The partial pressure of the O2 is 21 kPa and the
partial pressure of the N₂ is 81 kPa. What is the partial pressure of the CO₂? (3 pts)
Answer:
the daddy and Video Bhai have a
Explanation:
for and or for the if or as or as there have no a of option to go with you 6th and I would love from you to help out in any event that I am from the only reason you would be so close and to me million times is the fact I am from the the only reason you have to do it the way I want it is the best way for us and we are not me million people that are not got to me it's not like they were in a bad place and they didn't want me million other people in my world who made me think about you are
Almost All of the Energy reaching the Earth from the sun is in the form of ________.
Answer:
solar radiation
Explanation:
please answer ................
Answer:
Explanation:
i. SO2
ii. Na2O
Describe the overall enthalpy of the chemical reactants compared to the enthalpy of the chemical products in the combustion of propane.
Answer:
A thermochemical equation for the combustion of propane (C3H8)(C3H8) is written as follows:
C3H8(l)+5O2(g)→3CO2(g)+4H2O(g);ΔH∘rxnC3H8(l)+5O2(g)→3CO2(g)+4H2O(g);ΔHrxn∘ = -2202.0 kJ/mol
The value given for ΔH∘rxnΔHrxn∘ means that:
a. the reaction of one mole of propane absorbs 2202 kJ of energy from the surroundings.
b. the reaction is endothermic.
c. the enthalpy of formation of propane is 2202 kJ/mol.
d. the reaction of one mole of propane releases 2202 kJ of energy to the surroundings.
e. None of these.
The use of lead paint in houses was banned in 1978 due to the health hazards associated with lead, specifically that
high levels of lead exposure is dangerous to humans. which branch of chemistry would study this?
Toxicology is the branch which studies about toxic chemicals and their effects.
What is Toxicology ?Toxicology is the branch in science in which the researches and study are done for finding the effect of the toxic or poisonous elements on plants , animals , human and earth at large.
High levels of lead exposure is dangerous to humans as it can cause permanent disabilities , it is carcinogenic and hence can lead to death.
This is studied in toxicology.
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On a summer day, you take a road trip through Death valley, california in an antique car.you start put at a temperature of 20*c, but the temperature in death valley will reach a peak of 51*c. The tires on your car can hold 15.6L of nitrogen gas at a starting pressure of 249 kPa the tires will burst wjen internal pressure (PB) reaches 269k kPa awnser the following queshtions and show your work
- how many moles of nitrogen gas are in each tire
The number of moles of nitrogen gas in each tire would be 1.595 moles
Ideal gas lawThe ideal gas law is represented by the equation:
PV = nRT where P = pressure, V = volume, n = number of moles of gas, R = constant, and T = temperature.
In this case, P = 249 kpa, V = 15.6 L, R = 8.31, and T = 293 K (273 + 20).
n = PV/RT = 249 x 15.6/8.31 x 293 = 1.595 moles
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If phosphorous has 5 valence electrons, how many does sulfur have?
Answer:
6
Explanation:
The atomic number for phosphorous is 15, meaning that it has 15 electrons (and protons). The first and second shells would be filled up with 2 and 8 electrons respectively, leaving 5 which goes on the third shell, which is also the valence shell, meaning phosphorous has 5 valence electrons.
Since the atomic number of sulfur is 16, the first and second shells are also filled up with 2 and 8 electrons respectively, leaving 6 to be on the third shell, the valence shell. Hence, sulfur has 6 valence electrons.
What event might occur when favorable adaptations build up in a population over many generations?
starvation
extinction
migration
speciation
Answer:
D.) Speciation
Explanation:
A.) is incorrect because favorable traits becoming more widespread within a population usually means that the population is becoming better suited for its environment. Therefore, unless there are external factors, starvation is not a direct result of positive adaptations.
B.) is incorrect because the population is gaining adaptations that make their survival within an environment more likely, not less likely. Again, extinction is the opposite of what occurs when this happens.
C.) is incorrect because migration typically occurs when a population is experiencing hardships within their environment. This is what causes them to move somewhere else in order to increase their survival/reproductive success. As stated previously, favorable adaptations would make the population better suited for their current environment. These changes would discourage migration.
D.) is correct because speciation occurs when a population changes so much over generations to the point in which they become another species entirely. If a population undergoes numerous positive adaptations, they will become more and more fit for their environment. This newfound fitness and these changes may be so drastic that the population becomes too different to classify them the same way they once were.
Answer:
D. speciation
Explanation:
took the test
What's reaction kinetics?
Answer: a branch of chemistry concerned with the rate of chemical reactions, the factors that influence these rates, and the use of rate studies to clarify reaction mechanisms