The half-life of 3H (H-3) is 12 years. About how long does it take for 127/128 of a sample of that radionuclide to decay? (Hint: this means only 1/128 are left)
A: 7 years
B:11.9 years
C:84 years
D:12.1 years
Answer:
i do believe its 7
Explanation:
Answer:84
Explanation:
What does the nucleus of the cell control?
Answer:
Image result for What does the nucleus of the cell control?
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus.
Explanation:
Answer:
Life functions
Explanation:
hope this helps <3
What factors are different in diagrams A and B?
Answer:
Acceleration Of B IS greater
Explanation:
F= mass x accelerarion
Acceleration of ( A) =20÷5 =4
Acceleration of (B) =5
Material
Mass
Tfinal
AT
Tinitial
min
(g)
O min
Water
200
Water
100
is Radon an elementary substance or a compound?
Answer:elementary substance
Explanation:
PLS HELP ASAP!
just need to balance the equation but i have no idea how pls help meee
Answer: --- N^2 + --- F^2 => --- NF^3
Question 28: Answer: 1 N^2 + 3F^2 => 2NF^3
Answer: 3F^2 , 2NF^3
Explanation:
What volume of oxygen at 455 K and a pressure of 127400 Pa is produced by the decomposition of 114.7 g of BaO2 to BaO and O2?
Answer:
10 L
Explanation:
The equation of the reaction is;
2BaO2 = 2BaO + O2
Number of moles of BaO2 = 114.7 g/169.33 g/mol = 0.677 moles
From the reaction equation;
2 moles of BaO2 yields 1 moles of O2
0.677 moles of BaO2 yields 0.677 * 1/2 = 0.3385 moles of oxygen
Hence;
PV=nRT
V = ?
P = 127400 Pa or 1.257 atm
T = 455 K
n = 0.3385 moles
R = 0.082 atmLmol-1K-1
V = nRT/P
V = 0.3385 * 0.082 * 455/1.257
V= 10 L
Which of the following should
have the LOWEST dissolved
oxygen?
A. A lake with a waterfall
B. a swiftly-moving stream
C. a beach with heavy wave action
D. a small, calm pond
Answer:
warm water holds the least amount of dissolved oxygen, so I would assume the answer would be D. a small pond could heat up easily. in addition, the water is calm and not moving in a pond
What will happen to a soccer ball that is rolling across a field if an unbalanced force of friction is acting on the soccer ball?
A. The soccer ball will gradually move slower and slower until it stops.
B. The soccer ball will continue to move at a constant speed.
C. The soccer ball will move at a constant speed for a while, then slow down and stop.
D. The soccer ball will slow down for a while and then move at a constant speed without stopping.
The ______ of the particles themselves is much less than the space in between those particles
plz write question properly. Its not understandable.
List two of the kingdoms found in the Eukarya domain
Photo attached, can anyone help??? I need help with question 28
Answer:
so what it's saying is that chlorine has two atoms because diatomic means consisting of two atoms.
Explanation:
can I please have brainliest? :)
Which component of the universe contains all of the other components listed below and would have the
greatest mass?
The galaxy is the component of the universe which contains all of the other components and would have the greatest mass.
What is a galaxy?A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity.The word is derived from the Greek galaxias , literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a hundred million stars, to the largest galaxies known – supergiants with one hundred trillion stars,each orbiting its galaxy's center of mass.
Most of the mass in a typical galaxy is in the form of dark matter, with only a few percent of that mass visible in the form of stars and nebulae. Supermassive black holes are a common feature at the centres of galaxies.
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What causes a substance to be hydrophobic?
In which cell will the molecules diffuse out
Explanation:
In plasma membrane the molecules diffuse out .
I hope this might be the answer
I hope this might be the answerand hope it helps u
When an object is acted on by unbalanced forces, the object will -
Answer:
hope it helps and thank you for the points
As the volume of a fixed mass of a gas increases at constant temperature, the pressure of the gas
A) increases
B) decreases
C) remains the same
25.2 g of CuSO4 6H20 (mm: 267.72 g/mol) is dissolved in 28.0 mL of water, calculate the molarity.
Answer:
3.36 M
Explanation:
Step 1: Given data
Mass of CuSO₄.6H₂O (m): 25.2 gMolar mass of CuSO₄.6H₂O (M): 267.72 g/molVolume of solution (V): 28.0 mL (we will assume it is equal to the volume of water)Step 2: Calculate the moles (n) of CuSO₄.6H₂O (solute)
We will use the following expression.
n = m/M
n = 25.2 g / (267.72 g/mol) = 0.0941 mol
Step 3: Calculate the molarity
Molarity is equal to the moles of solute divided by the liters of solution.
M = 0.0941 mol/0.0280 L = 3.36 M
balance the equation below SO2+O2>SO3
Explanation:
The balanced equation is 2SO2+O2→2SO3
Help please!!!!!!!!!!!!!!!!!!!!!!!!
CH4 + 2O2 → CO2 + 2H2O How many products are produced by this reaction?
A.4
B.2
C.3
D.1
Answer:
i think its 2 but I'm not sure
3. Explain why ionic compounds are "fixed" in their chemical composition.
Answer: Ionic compounds are "fixed" in their chemical composition as forces present between atoms of these compound are strong electrostatic forces of attraction due to which these compounds have fixed chemical composition.
Explanation:
Compounds formed by transfer of electrons from one atom to another are called ionic compounds.
For example, sodium atom on losing its one valence electron forms [tex]Na^{+}[/tex] ion and when a chlorine atom gains this electrons then it forms [tex]Cl^{-}[/tex] ion. These ions when come closer then an electrostatic force of attraction will pull them together forming NaCl compound.
Therefore, one atom of sodium is chemically combining to one atom of chlorine to form NaCl.
As the forces present between atoms of an ionic compound are strong electrostatic forces of attraction due to which these compounds have fixed chemical composition.
Thus, we can conclude that ionic compounds are "fixed" in their chemical composition as forces present between atoms of these compound are strong electrostatic forces of attraction due to which these compounds have fixed chemical composition.
Ionic compounds are formed when there is a donation of an electron from one element to another that receives the electron. This causes the donating atom to attain a positive charge and the receiving atom to attain a negative charge. The ions thus formed are held by strong electrostatic forces that hold them together.
Ionic bonds are formed through the transfer of electrons from one element to another which receives the electron.Positive and negative ionic charges are thus acquired by the respective elements. Strong electrostatic forces that act in all directions hold the ions together. This also gives them the fixed state that makes it more difficult to break them up when compared to the covalent bonds. So, the strong electrostatic forces cause the fixed state of ionic compounds.
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How do we determine the number of electrons in a neutral atom?
this is the answer of your question .
Hope it helped you
#4 6th grade science
Answer:
Taxonomy
Explanation: Taxonomy formally names and classifies organisms by thier structure, function, and relationships
what is the substance that is formed when the acid react with bases in a neutralization reaction?
Answer:
Water and Salt
Explanation:
A neutralization reaction occurs when an acid and a base react to produce water and a salt, and it entails the formation of water from the mixture of H+ and OH- ions.
Answer:
NaCl and water is formed when acid reacts with base
What is the pressure of nitrogen in atmospheres of a sample that is at 516.0 mm hg?
A) 0.679 atm
B) 5.09
C) 18.4 atm
D) 35.1 atm
Answer:
nitrogen in atmospheres of a sample is 0.679
What is the coefficient in front of the O₂ when the equation below is balanced C₂H₆O₂(g) + O₂ (g) → CO₂(g) + H₂O (g)
Answer:
The balanced equation is:
2C₂H₆O₂ (g) + 5O₂ (g) → 4CO₂ (g) + 6H₂O (g)
Therefore, the coefficient in front of O₂ when the given equation is balanced is 5.
Explanation:
In order to balance a chemical equation, it is necessary to ensure that there is an equal number of atoms for each element on both sides of the equation. This can be achieved by adding coefficients to chemical symbols or formulas as required.
Given equation:
C₂H₆O₂ (g) + O₂ (g) → CO₂ (g) + H₂O (g)
This equation is not balanced, because there are:
2 carbon atoms on the left side of the equation and only one on the right side.6 hydrogen atoms on the left side of the equation and only 2 on the right side.4 oxygen atoms on the left side of the equation and only 3 on the right side.Add the coefficient 2 in front of CO₂ and the coefficient 3 in front of H₂O on the right side of the equation:
C₂H₆O₂ (g) + O₂ (g) → 2CO₂ (g) + 3H₂O (g)
The carbon and hydrogen atoms are now balanced, but there are 4 oxygen atoms on the left side and 7 oxygen atoms on the right side. To balance the equation, double the coefficients on the right side and add the coefficient 2 in front of C₂H₆O₂ on the left side of the equation:
2C₂H₆O₂ (g) + O₂ (g) → 4CO₂ (g) + 6H₂O (g)
Now we have 6 oxygen atoms on the left side and 14 oxygen atoms on the right side. So if we add the coefficient 5 in front of O₂, there are14 oxygen atoms on the left side, and thus the equation is balanced.:
2C₂H₆O₂ (g) + 5O₂ (g) → 4CO₂ (g) + 6H₂O (g)
[tex]\begin{array}{|l|c|c|}\cline{1-3}\vphantom{\dfrac12}&\sf Left\;side&\sf Right\;side\\\cline{1-3}\vphantom{\dfrac12}\sf Carbon&2 \times 2=4&4\\\cline{1-3}\vphantom{\dfrac12}\sf Hydrogen&2 \times 6=12&6 \times 2=12\\\cline{1-3}\vphantom{\dfrac12}\sf Oxygen& 2\times 2+5 \times 2=14&4 \times 2+6 =14\\\cline{1-3}\end{array}[/tex]
Therefore, the coefficient in front of O₂ when the given equation is balanced is 5.
If greenhouse gases in the atmosphere act like a blanket around the Earth, how is this "blanket" being changed by human activities?
Answer:
c on edg
Explanation:
i dont know for sure so sorry if i am wrong.
and have a good day <3
How many joules are required to melt 100 grams of water? The heat of
fusion of water is 6.01 kJ / mole.
Which group on the periodic table has the greatest number of metallic elements? O A. Group 18 (VIIIA) O B. Group 2 (IIA) OC. Group 13 (IIIA) O D. Group 7 (VIIB)
Answer: 18
Explanation:
i took a test and reviewed it and it said 18
On the periodic table, group IA has the most metallic elements.
What is Periodic table?All identified chemical elements are arranged in rows (referred to as periods) and columns (referred to as groups) in the periodic table of chemical elements, also known as the periodic table, in ascending order of atomic number.Groups are the names given to the periodic table's columns. In the table, individuals who belong to the same group make bonds of the same kind and have an equal number of electrons in their atoms' outermost shells. The periods refer to the horizontal rows.Elements in the periodic table can be divided into groups and eras. The periodic table is organized into horizontal rows for periods and vertical columns for groupings. As you advance, the atomic number grows.To learn more about Periodic table refer to:
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