Answer:
a line like this l
l
no like this-----
Explanation:
Generally, does the size of a radioactive sample affect half-life?
Answer:
The quantity of radioactive nuclei at any given time will decrease to half as much in one half-life.
Explanation:
There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. The size of radioactive sample does not affect the half life.
What is half life?Half life tells about the time at which the radioactive material decays to half of its initial concentration. Decay of radioactive element always comes under first order kinetics.
Mathematically, the half life of first order reaction can be given as:
half life= 0.693÷λ
λ=decay constant
Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. Half life is not affected by size of radioactive sample.
Therefore, The size of radioactive sample does not affect the half life.
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Name two minerals found in Jamaica
Answer:
limestone, silica, marble, mineral fuels, gold.
Answer:
here are two minerals found in jamaica
1.bauxite
2. titanium
Hydrogen bonding is present in all of the following molecular solids EXCEPT ____.a) H2O2 b) PH3 c) H2SO4 d) NH3
Answer:
b) PH3
Explanation:
Answer:
answer is Option A
H202.
What does percent composition tell you about a substance?
O A. It gives you the molecular formula of the substance.
O B. It gives you the total mass of the substance,
O C. It tells you what the substance is made of,
O D. It tells you how many moles are in the substance,
Answer:
Percent composition tells you which types of atoms (elements) are present in a molecule and their levels. Percent composition can also tell you about the different elements present in an ionic compound as well.
In a series circuit there are 17 light bulbs, each providing 1 ohm of resistance. What is the total resistance?
5 ohms
1/17 ohms
34 ohms
17 ohms
Answer:
17 ohms
Explanation:
Given that,
In a series circuit there are 17 light bulbs, each providing 1 ohm of resistance.
We need to find the total resistance of the circuit.
The equivalent resistance for series combination is given by :
[tex]R_{eq}=R_1+R_2+....[/tex]
For 17 light bulbs, the equivalent resistance is given by :
[tex]R_{eq}=R+R+....\text{upto 17 terms}\\\\R_{eq}=17R\\\\=17[/tex]
Hence, the total resistance is 17 ohms. Hence, the correct option is (d).
Answer:
17 ohms
Explanation:
Hope it helps
Balancing equations:
NaBH4 + BF3 ------ NaBF4 + B2H6
Answer:
3NaBH4+ 4BF3 --- 3NaBF4 + 2B2H6
Explanation:
Balancing of the given equation: NaBH₄ + BF₃ → NaBF₄ + B₂H₆ is 11 NaBH₄ + 6 BF₃ → 3 NaBF₄ + 3 B₂H₆
First, let's balance the boron (B) atoms. On the left side, there is 1 B atom in NaBH₄ and 1 B atom in BF₃, giving a total of 2 B atoms. On the right side, there are 4 B atoms in NaBF₄ and 2 B atoms in B₂H₆, giving a total of 6 B atoms. To balance the B atoms, we can put a coefficient of 3 in front of NaBF₄ and a coefficient of 3 in front of B₂H₆.
3 NaBH₄ + BF₃ → 3 NaBF₄ + 3 B₂H₆
Next, let's balance the hydrogen (H) atoms. On the left side, there are 4 H atoms in NaBH4 and 3 H atoms in BF₃, giving a total of 7 H atoms. On the right side, there are 4 H atoms in NaBF₄ and 18 H atoms in B₂H₆, giving a total of 22 H atoms. To balance the H atoms, we can put a coefficient of 11 in front of NaBH₄ and a coefficient of 6 in front of BF₃.
11 NaBH₄ + 6 BF₃ → 3 NaBF₄ + 3 B₂H₆
Finally, let's balance the sodium (Na) and fluorine (F) atoms. On both sides, there is 11 Na, 6 F, and 6 B, so they are already balanced.
Hence, the balanced equation is:
11 NaBH₄ + 6 BF₃ → 3 NaBF₄ + 3 B₂H₆
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If 312 grams of H2 is used, how many grams of water will be produced?
Answer:
32g O2 x 36.03056g H20/31.9988g O2 this way the O2 cancels out and you are left with just the H2O so your raw answer would be 36.0319112, then if your instructor requires a significant figure answer that would be to 2 significant figures the information you were given 32g O2, so as above 36g or Water are produced. Just a different way to view and solve the problem with the balanced equation so you can see the way everything relates to everything else. the molar masses of O2 and H2O are simply found my adding up 2 Oxygens 15.9994g x2 = 31.9988g and H2O = 2(1.00794) + 15.9994 = 18.01258 but you then have to multiply that by 2 because the reaction states you get 2 mols in the reaction so that is where I came up with the 36.03056g for the solution. Hope this helps. Dimensional Analysis is and can be one of the best ways to solve these problems, because not always are you going to be dealing with 1:2 ratios.
What best explains the formula unit for a compound made from fluorine and hydrogen? (5 points) a HF, because fluorine is short of one electron, and hydrogen is in excess of one electron. b HF, because both fluorine and hydrogen are capable of forming only one covalent bond. c H2F, because fluorine is short of two electrons, and hydrogen is short of one electron. d H2F, because fluorine is capable of forming one, and hydrogen is capable of forming two covalent bonds.
Answer:
c
Explanation:
Connect with the world to the world of the world and the world of the world and
Consider the acidity constants below to answer the following question(s). ACID STRUCTURE pKa phenol 10.00 ethanol CH3CH2OH 16.00 water HOH 15.74 Which acid will be almost completely deprotonated by NaOH
Answer:
phenol
Explanation:
The pKa may be regarded as a measure of how tightly a proton is held by the conjugate Brownstead-Lowry acid.
The lower the value of the pKa, the more easily the proton may be lost. The higher the pKa the less easily the proton is lost. The pKa may sometimes be so low that it is even a negative number!
pKa is a masure of acid strength. While strong acids have a smaller pKa, weak acids have a larger pKa. From the foregoing, phenol having the smallest pKa among all compounds listed, will be almost completely deprotonated by NaOH.
How would you compare a health care system in Ancient Egypt and a interdisciplinary health care team?
O An interdisciplinary team shares goals and responsibilities. In Ancient Egypt, each level of professionals had different goals and
responsibilities.
O Today's interdisciplinary teams are structured as hierarchies. In Ancient Egypt, these teams were patient focused.
O These systems are very different; in Ancient Egypt, the team was all ranked the same, where today, the teams all have different
rankings based on importance.
o These systems are quite similar; the only difference is that interdisciplinary teams today have better technology.
Answer:
A
Explanation:
Answer:
A) An interdisciplinary team shares goals and responsibilities. In Ancient Egypt, each level of professionals had different goals and responsibilities.
Explanation:
You mix 999 mL pure water and 1 mL of 2.0 M NaOH. Calculate the pH of the resulting solution. (assume the total volume is 1.0 L).
a. 0.3
b. 0.7
c. 2.7
d. 11.3
e. 13.7
Answer:
D => 11.3
Explanation:
(Molarity x Volume) diluted = (Molarity x Volume) concentrate
=> [NaOH] = (1/999)(2M) = 0.002M in NaOH = 0.002M OH⁻
pOH = -log[OH⁻] = -log(0.002) = 2.7
pH = 14 - pOH = 14 - 2.7 = 11.3
7 H2SO4
what is the coefficient?
what are the subscript numbers?
Answer:
Coefficient: number balancing sulfuric acid in a chemical reaction.
Subscripts: number of atoms of each element forming the compound.
Explanation:
Hello!
In this case, since sulfuric acid is a molecule containing hydrogen, sulfur and oxygen in the following way:
- Two hydrogen atoms.
- One sulfur atom.
- Four oxygen atoms.
We can notice the 2 at H represents those two hydrogen atoms, the subscriptless S represent that 1 sulfur atom and the 4 at O represents those four oxygen atoms.
Moreover, since the molecules is given as 7 H2SO4 ; from stoichiometry, we infer that every number preceding the molecule stands for a coefficient which is used to balance a undergoing chemical reaction reaction.
Best regards!
how much hydrogen was created?
Answer:oh no i didnt see the picture
Explanation:
A 10 mL sample of concentrated NaCl (10.80 M) is diluted to a final volume of 650 mL. What is the molarity of the final solution
Answer:
0.166 M
Explanation:
Initial volume V1 = 10 ml
Initial concentration C1 = 10.80 M
Final volume V2 = 650 ml
Final concentration C2 = ?
The parameters are related by the following equation;
C1V1 = C2V2
Making C2 subject of formula, we have;
C2 = C1V1 / V2
Inserting the values
C2 = 10.80 * 10 / 650
C2 = 108.1 / 650 = 0.166 M
Iron, an element with the chemical symbol Fe, is an important element. It is used to make steel and is part of the substance that transports oxygen throughout the human body. Which statement about Fe is supported by the modern atomic theory but not John Dalton’s theory?
The element iron is composed of small particles called atoms.
The electrons of iron have probable locations in a region of space around the nucleus.
Iron atoms combine with other atoms in whole number ratios to form compounds.
Chemical reactions that involve iron do not create new atoms of iron.
Answer:
b
Explanation:
The statement about Fe that supports the modern atomic theory but not John Dalton's theory would be that the electrons of iron have probable locations in a region of space around the nucleus.
This is because John Dalton's atomic theory does not recognize the existence of protons, neutrons, and electrons in atoms.
Recall John Dalton's atomic theory:
all elements consist of indivisible particles called atoms.atoms of the same elements are identical and different from atoms of other elementsatoms cannot be created and neither can they be destroyedatoms of different elements can combine in a simple whole-number ratio to form compoundsThus, the postulate of the modern atomic theory that says that atoms have a structure with protons and neutrons in its nucleus and electrons in its outer shells negates one of the theories of Dalton.
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Question 1 of 10
Which of these statements does not accurately describe electricity?
A. Electricity is a flow of electrons.
B. Electricity acts in ways similar to ice, which is a solid.
c. If enough electricity builds up, it will flow through an insulator.
O D. Voltage is a type of pressure that can direct electricity to flow
"uphill."
The statement electricity acts in ways similar to ice, which is a solid is not true about electricity.
What is electricity?Electricity can be defined as a flow of electrons that have free movement in an electrical circuit.
These electrons moves from a negative pole to a positive pole and this movement exhibits a tension that we call voltage.
In conclusion, the statement electricity acts in ways similar to ice, which is a solid is not true about electricity.
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Which option is an example of a physical property?
flammability
solubility
reactivity
toxicity
Answer:
Solubility
Explanation:
Answer:
(B) Solubility
Explanation:
NASA launches a probe with a mass of 15,000 kg to another planet more
massive than than Earth. Which statement is true about the probe once it has
reached the other planet?
A.)The weight of the probe will increase.
B.)The mass of the probe will decrease.
C.)The mass of the probe will increase.
D.)The weight of the probe will decrease .
Answer: A
Explanation: Just took the test
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the correct option is option D that is the weight of the probe will decrease.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
The relative mass is the mass that is with respect to mass of a matter that is considered as standard. In chemistry relative mass is equal to the mass of one-twelfth the mass of C-12 isotope .
% relative error=(Difference in weight÷ original weight)×100
The weight of the probe will decrease.
Therefore, the correct option is option D that is the weight of the probe will decrease.
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During winter vacation, you learn that a polar jet stream is traveling across the United States, the forecaster says there will be big
changes in the weather as the jet stream moves past your town in Florida.
Which instrument measures wind speed?
rain gauge
wind vane
speedometer
anemometer
example of a electrolytic cell we use in everyday life.
Answer: Important examples of electrolysis are the decomposition of water into hydrogen and oxygen, and bauxite into aluminium and other chemicals. Electroplating (e.g., of copper, silver, nickel or chromium) is done using an electrolytic cell. We encounter electrochemical cells in all facets of our everyday lives from the disposable AA batteries in our remote controls and the lithium-ion batteries in our iPhones to the nerve cells strewn throughout our bodies. There are two types of electrochemical cells: galvanic, also called Voltaic, and electrolytic.
Hope this helps....... Stay safe and have a Merry Christmas!!!!!!!!! :D
Disposable AA batteries can be the example of an electrolytic cell we use in everyday life.
What is electrolyte cell?An electrolytic cell is an electrochemical cell that forces a chemical reaction that wouldn't happen otherwise by using an external source of electrical energy.
Anode and cathode, which are submerged in an electrolyte solution, are the two electrodes that make up the cell and serve as the external energy source.
Electrolytes are necessary for basic bodily functions such producing and conducting action potentials in the nerves and muscles, and maintaining electrical neutrality in cells.
Along with magnesium, calcium, phosphate, and bicarbonates, sodium, potassium, and chloride are the important electrolytes.
From the throwaway AA batteries in our remote controls and the lithium-ion batteries in our iPhones to the nerve cells dispersed throughout our bodies, electrochemical cells are present in every aspect of our daily lives.
Thus, Disposable AA batteries are electrolyte cell used in daily life.
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6. A 4.0 L sample of methane gas is collected at 30.0 °C. Predict the volume of the sample at
0.0 °C.
Write out the answer
Answer:
V₂ = 3.6 L
Explanation:
Given data:
Initial volume = 4.0 L
Initial temperature = 30.0°C
Final volume = ?
Final temperature = 0.0°C
Solution:
Initial temperature = 30.0°C (30+273= 303 K)
Final temperature = 0.0°C (0+273= 273 K)
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 4.0 L × 273 K / 303 k
V₂ = 1092 L.K / 303 K
V₂ = 3.6 L
nuclear energy, energy is inside what
Answer:
Nuclear energy is energy in the core of an atom
Atoms themselves are made up of three particles called protons, neutrons, and electrons. An atom has a nucleus (or core) containing protons and neutrons, which is surrounded by electrons.
Explanation:
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Molecular Structure Lab Report: Determining Polarity
Create a hypothesis that predicts the polarity of iodine solution, vinegar, vegetable oil, salt, water, and rubbing alcohol.
PLEASE HELP!
Answer: See attached explanations
Polar substances dissolve in water while non polar substances do not dissolve in water.
Water has polar O - H bonds hence it must be a polar molecule. Polar molecules are molecules that have unsymmetrical electron distribution between atoms in a bond.
Substances that dissolve in water are polar substances. The following substances dissolve in water;
saltrubbing alcohol vinegarHence, these substances are polar.
The following substances do not dissolve in water hence they are nonpolar;
iodine solutionvegetable oilLearn more: https://brainly.com/question/8155254
Based on the following balanced equation:
H2 + O2 à H2O
How many moles of O2 are required to react completely with 2.00 moles of H2
Moles of O₂ are required : 1 mol
Further explanationGiven
2.00 moles of H₂
Required
moles of O₂
Analysis
Balanced equation
Find mol ratio O₂ and H₂
Solution
Balanced equation
2H₂ + O₂ → 2H₂O
From the equation, the mol ratio of H₂ : O₂ = 2 : 1, so mol O₂ :
[tex]\tt \dfrac{1}{2}\times 2=1~mol[/tex]
What is the major organic product that results when 3-heptyne is subjected to excess hydrogen and a platinum catalyst?
A) 2-heptyne
B) (Z) -2-heptene
C) (Z)-3-heptene
D) (E)-3-heptene
E) heptane
Answer:
E) heptane .
Explanation:
Hello!
In this case, referring to the hydrogenation of alkynes over platinum catalyst in excess hydrogen, it's been demonstrated that such process occurs upon two steps; first hydrogenation to alkene and second the hydrogenation to alkane:
CH₃-CH₂-C≡C-CH₂-CH₂-CH₃ + H₂ → CH₃-CH₂-CH=CH-CH₂-CH₂-CH₃
CH₃-CH₂-CH=CH-CH₂-CH₂-CH₃ + H₂ → CH₃-CH₂-CH₂-CH₂-CH₂-CH₂-CH₃
Therefore, the product is E) heptane .
Best regards!
what does 1 carbon and 1 sulfur make
Answer:
During the combustion process carbon dioxide and sulfur dioxide are the primary reaction products formed. A very small amount of carbon monoxide is formed in every induction furnace.
Explanation:
In a mixture of gases exerting a total pressure of 2.50 atm, carbon dioxide has a mole fraction of 0.450. What is the partial pressure of carbon dioxide?
Answer:
1.12 atm is the correct answer
student conducted a simple experiment to explore heat transfer they constructed the closed system you see here a metal soda can inside a styrofoam cup the metal can was filled with an 80° c cup of water and placed into the cell phone called containing colder water at 10° cthe students predicted that the water in the middle can would decrease in temperature while the water temperature inside the cup would increase based on the student data recorder and the data table the prediction was correct explain how to transfer heat energy occurred select all the statements that could apply
Answer: its all A,B,C, and D
Explanation:i got it right on usa test prep lol
What are three things that the elements Magnesium, Calcium and Barium have in common?
Answer:
1.They are all in the second group of the periodic table
2.They are an alkaline earth metal
3.They all have a shine to them
4.They are all highly reactive
5.They have a silver/white to them
6.They can all be found in the Earths crust
I'm not really sure of any others that they have in common and I thought to give extra so you could choose.
If 120 grams of aluminum oxide reacts with 100 grams of magnesium, which reactant is in excess and by how much?
Al2O3 + 3Mg —> 3MgO + 2Al
Answer:
Limiting reactant is magnesium.
14.1 g remain unreacted.
Explanation:
Hello!
In this case, given the balanced chemical reaction, we are able to compute the moles of each reactant by using their molar masses:
[tex]n_{Al_2O_3}=120gAl_2O_3*\frac{1molAl_2O_3}{101.96gAl_2O_3}=1.18molAl_2O_3\\\\n_{Mg}=100gMg*\frac{1molMg}{24.31gMg}=4.11molMg[/tex]
Now, since they are reacting based on a 1:3 mole ratio, we can compute the moles of magnesium consumed by the 1.18 moles of aluminum oxide as follows:
[tex]n_{Mg}^{consumed}=1.18molAl_2O_3*\frac{3molMg}{1molAl_2O_3} =3.53molMg[/tex]
Meaning there are more available moles of magnesium than consumed, and therefore it is the limiting reactant. Moreover, it is in excess by:
[tex]n_{Mg}^{excess}=4.11mol-3.53mol=0.58molMg\\\\m_{Mg}^{excess}=0.58molMg*\frac{24.31gMg}{1molMg}\\\\ m_{Mg}^{excess}=14.1gMg[/tex]
It means that 14.1 g of magnesium remain unreacted.
Regards!
