Answer:
It has the atomic mass of 12.
based on the half-life of Tc-99, how many half-lives have to pass for a 150 mg sample of Tc-99 to decay down to 30mg?
Answer:
2.322 half-lives have passed to decay down from 150 miligrams to 30 miligrams.
Explanation:
The half of Technetium-99 is approximately 211000 years. The decay of isotopes is represented by the following ordinary differential equation:
[tex]\frac{dm}{dt} = -\frac{m}{\tau}[/tex] (Eq. 1)
Where:
[tex]\frac{dm}{dt}[/tex] - First derivative of isotope mass in time, measured in miligrams per year.
[tex]m[/tex] - Mass of the isotope, measured in miligrams.
[tex]\tau[/tex] - Time constant, measured in years.
Now we proceed to obtain the solution of this differential equation:
[tex]\frac{dm}{m} = -\frac{dt}{\tau}[/tex]
[tex]\int {\frac{dm}{m} } = -\frac{1}{\tau}\int dt[/tex]
[tex]\ln m = -\frac{t}{\tau}+C[/tex]
[tex]m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }[/tex] (Eq. 2)
Where:
[tex]m_{o}[/tex] - Initial mass of the isotope, measured in miligrams.
[tex]t[/tex] - Time, measured in years.
The time passed for isotope is cleared within the equation described above:
[tex]\ln \frac{m}{m_{o}} = -\frac{t}{\tau}[/tex]
[tex]t = -\tau \cdot \ln \frac{m}{m_{o}}[/tex]
In addition, we can obtain the time constant as a function of half-life:
[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex] (Eq. 3)
If we know that [tex]t_{1/2} = 211000\,yr[/tex], [tex]m_{o} = 150\,mg[/tex] and [tex]m = 30\,mg[/tex], then the time passed is:
[tex]\tau = \frac{211000\,yr}{\ln 2}[/tex]
[tex]\tau \approx 304408.654\,yr[/tex]
[tex]t = -(304408.654\,yr)\cdot \ln \left(\frac{30\,mg}{150\,mg} \right)[/tex]
[tex]t \approx 489926.829\,yr[/tex]
The amount of passed half-lives is that time divided by a half-life. That is:
[tex]n = \frac{489926.829\,yr}{211000\,yr}[/tex]
[tex]n = 2.322[/tex]
2.322 half-lives have passed to decay down from 150 miligrams to 30 miligrams.
Briefly explain why the bulk temperature of the water remains low (at room temperature)
A scientist plants two rows of corn for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of sun and water. She checks the growth of the corn over the course of five months.
Q9) What is the independent variable in this experiment? Why is this variable independent?
Q10) What is the dependent variable in this experiment? Why is this a dependent variable?
Q11) What variables are controlled in this experiment? Why are/is these/this variable control variable(s)?
Answer:
Q9. The independent variable in this experiment is the fertilizer. It is independent because she manipulating the variable to compare the growth.
Q10. The dependent variable in this experiment is the amount of growth of the corn. It is this because the growth depends on what the scientist did on the corn.
Q11. The variable controlled in this experiment is the amount of sun and water. These two variables never change so this is why it is the control.
Explanation:
Answer:
Explanation:
independent - 5 months dependent - sun controlled - water and the fertilizer
A new element was discovered. It’s average atomic mass was found to be 245.6 amu. Isotope #1 has a mass of 243.2 amu; isotope #2 has a mass of 244.9 amu; isotope #3 has a mass of 247.2 amu. Which isotope is most likely to be the most abundant?
A
Isotope 1
B
Isotope 2
C
Isotope 3
D
They all contribute the same amount
Answer:
B. Isotope 2
Explanation:
Isotopes can be defined as the atom of an element that has the same number of protons but different number of neutrons. This ultimately implies that, the isotopes of an element have the same atomic number (number of protons) but different atomic mass (number of nucleons).
Basically, the atomic mass of any chemical element found in the periodic table is equal to the weighted average of all its isotopes. Therefore, the isotope with the closest mass to the weighted average would be the most abundant.
In this scenario, a new element was discovered with an average atomic mass of 245.6 amu.
Isotope #1 has a mass of 243.2 amu.Isotope #2 has a mass of 244.9 amu.Isotope #3 has a mass of 247.2 amu.Hence, the isotope which is most likely to be the most abundant is isotope #2 that has a mass of 244.9 amu because it is closest in mass to the relative atomic mass (weighted average) of 245.6 amu.
I WILL MARK YOU THE BRANLIEST!!!
Which property shows that electrons are quantized?
A. Electrons are attached to protons.
B. Each electron has its own "address."
C. Each electron carries a charge.
D. Electrons have very little mass.
Answer:
B. Each electron has its own "address."
Explanation:
This is the correct answer.
Good luck with the rest, and have a good day : )
Each electron has its own "address." Therefore, the correct option is option B among all the given options.
What is quantization?The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are part of the lepton particles family's first generation, are typically regarded to be elementary particles. The mass of an electron is roughly 1/1836 that of a proton.
The electron has a half-integer intrinsic rotational momentum that is represented in terms of the decreased Planck constant,, among its quantum mechanical features. The rule of exclusion developed by Pauli states that because electrons are fermions, no two of them may be in the same quantum state. Since they're capable of collide against other particles as well as can be bent like light, electrons, like all primary particles, display both wave and particle characteristics. Each electron has its own "address."
Therefore, the correct option is option B.
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What is the density of aluminium? |
एल्यूमीतनयम का घनत्व कतना होता है?
A : 2.7 g/cm3 | 2.7 g/cm3
B : 3.7 g/cm3 | 3.7 g/cm3
C : 4.7 g/cm3 | 4.7 g/cm3
D : 5.7 g/cm3 | 5.7 g/cm3
Ans: A : 2.7 g/cm3 | 2.7 g/cm3
Answer:
answer 2.7
Explanation:
a.2.7g/cm3
Which statement best describes how to predict the formula of a stable ionic compound? Use the same number of cations as anions so that the compound is neutral. Use more cations than anions so that the compound is positively charged. Use enough cations and anions so that the total charge is zero. Use fewer cations than anions so that the compound is negatively charged.
IT's C
Answer:
Option C: Use enough cations and anions so that the total charge is zero
Explanation:
In a stable ionic compound, to get a predict the formula, the positive and negative ions on one side need to cancel out so that the compound becomes neutral.
For example, let's take consider an ionic compound known as Potassium Chloride. It has a formula KCl. Now , breaking it down, the charges will be; K+ and Cl-. This means Potassium (K) has +1 charges and Chloride has -1 charges. Thus, they will cancel out to give a total neutral charge of 0.
Thus, the correct answer is to use enough a ions and cations so that the total charge is zero.
Answer:
C
Explanation:
edge 2020 unit rev
“An icy wind teetered trash cans and turned my cheeks to marble.”
What does the imagery in this sentence tell the reader about the weather?
in seedfolks
Electronic configuration PLZZZ GUYSS(sub shell distribution) for L shell will be .........................
Answer:
Shells
The maximum number of electrons that can be accommodated in a shell is based on the principal quantum number (n). It is represented by the formula 2n2, where ‘n’ is the shell number. The shells, values of n, and the total number of electrons that can be accommodated are tabulated below.
Shell and ‘n’ value Max. Electrons in the Electron Configuration
K shell, n=1 2*12 = 2
L shell, n=2 2*22 = 8
M shell, n=3 2*32 = 18
N shell, n=4 2*42 = 32
L shell: n =2
hence,
2n²
= 2(2)²
i.e. 8 electrons can fit in the l shell
hence max no. of electrons is 8
so configuration in L shell is,
2, 8...
. Which of these is an example of a scientific observation? *
AThe rock is smooth and gray."
BWhat is the best brand of soap?"
CMost people drive black cars."
DThe sun's light helps plants grow."
Answer:
D. The sun's light helps plants grow
Explanation:
This is a scientific observation, because it is describing the structure of a living thing.
The chemical formula for calcium chloride is
Answer: anhydrous CaCl 2 :0H 2 O
monohydrate CaCl 2 :1H 2 O
a di-hydrate CaCl 2 :2H 2 O
Explanation:
Which statement accurately describes the atoms of a specific element? *
An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.
A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.
An aluminum, Al, contains 27 electrons and 27 protons inside the nucleus.
A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus
Answer:
the last one, (A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus)
A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus accurately describes the atoms of a specific element ,therefore option (d) is correct.
What are the characteristics of zinc element ?Zinc is placed in group 12 of the periodic table. It is in the first period of transition or d block elements, and fourth period of the periodic table.
Zinc is a metal. It has two valence electrons that are lost easily. Zinc forms positive ions with 2+ charges, like the metals of the alkaline earth family.
Uses of zinc element -:
Zinc is an important trace element for human beings. Zinc is used for making brass, an alloy of copper and zinc.Zinc is used as the anode in dry cells.A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus accurately describes the atoms of a specific element ,hence option (d) is correct.
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A flashbulb of volume 1.70 mL contains O2(g) at a pressure of 2.30 atm and a temperature of 18.0°C. How many grams of O2(g)
the flashbulb contain
Answer:
0.0001637 mol
Explanation:
PV = nRT
Very important formula in chem
2.3 atm * 0.0017 L = n * 0.082057 * 291 K
= 0.0001637 mol O2
This concept is very important in chem, practice it.
Im confused please help :(
1.) When kinetic energy is high, velocity is high.
true or false
2.) When potential energy is high, velocity is at its highest.
true or false
Answer: #1: true
#2: false
Explanation: I’m not 100% sure though!
A non polar covalent bond (pure covalent) would form in which of the following pairs of atoms?
A.) H-Cl
B.) Se-Br
C.) Na-Cl
D.) Br-Br
How many protons and electrons does a hydrogen atom have?
A hydrogen atom contains 1 electron, 1 proton
Explanation:
Describe what will eventually happen to the water level in the beaker.
Explain your reasoning.
Answer:
The water level in the beaker will eventually go down because some of the liquid water changes into ice (a solid) and the particles get closer together in the beaker. The water level in the beaker will eventually stay the same because some of the liquid water changes into water vapor (a gas) and leaves the beaker.
Releases sugar (glucose) into the blood stream to power cells A. Brain B. Heart C. Liver D. Stomach and intestines
Answer:
C Liver
Explanation:
One differentiating characteristic between vascular and nonvascular plants is the lack of active transport structures in the nonvascular plants. How does the lack of xylem or phloem contribute to the smaller size of the nonvascular plants?
Nonvascular plants are smaller because xylem and phloem help a plant stand up taller.
Nonvascular plants have other transport structures that are microscopic and therefore take up less room.
Nonvascular plants rely upon concentration gradients to move food and water, which only works over small distances.
Nonvascular plants are smaller because they don’t photosynthesize as much as vascular plants and don’t get enough food.
Answer:
One of the most important characteristics of non-vascular plants is the absence of vascular tissues. Non-vascular plants do not have the vascular tissues known as xylem and phloem. ... As they do not have any vascular tissue, they cannot retain water for long time or transport it to other parts of the plant.
Explanation:
Answer:
fern
Explanation:
Which statement describes all chemical changes, but not all physical changes?
Answer:
A new substance forms.
Explanation:
Answer:
B
Explanation:
Which phrase describes neap tides?
A.) occur four times a day
B.) produce extra-low tidal ranges
C.) caused only by the pull of the moon
D.) occur at the same time as spring tides
NEED YOUR HELP.
Answer:
The answer is B
Explanation:
Neap tides are a type of to tie occuring after spring tides. It occurs when moon and sun are at the right angles to each other. It produce low tidal ranges. Hence, phrase B is correct.
What are tides ?Tides are a geographical phenomenon taking place due to the gravitational pull by sun and moon on the ocean of earth. They are long period waves causing the ocean back and forth to the cost.
During new moons larger tides appears in earth and they are called spring tides. Spring tides occurs twice in a lunar month. During spring tides, moon appears full and earth is between sun and moon.
After seven days of spring tide, lower tides are produced when the moo and sun comes in right angle to each other. They are called the neap tides producing lower range of tidal waves . During this time moon will be half full thus for the first and last quarter of the moon. Hence, the option B neap tide produce low tidal ranges is correct.
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A student conducting a calorimetry investigation determines a negative ∆H. What does the negative value indicate about the reaction?
A. The reaction synthesized a single product.
B. The reaction was exothermic.
C. The reaction absorbed energy.
D. The reaction involved decomposition.
Answer:
a
Explanation:
correct
50 POINTS
Assume that the variables x and y are inversely related. If k = 18, what is the value of y for each of the following points?
Be sure and record your data to be used in the following problem.
х y k
1 18
A: 18,0.05,9
2 18
A: 0.11,36,9
3 18
A: 0.16,6,54
6 18
A: 0.33,108,3
9 18
A: 162,0.5,2
18 18
A: 324,0.75,1
Answer:
9/.05=180. I think it's 1
Explanation:
If x and y are inversely proportional then the product of xy =k or y=k/x
Watts are a measurement of power
Answer:
Watts are a measurement of power, describing the rate at which electricity is being used at a specific moment. For example, a 15-watt LED light bulb draws 15 watts of electricity at any moment when turned on. Watt-hours are a measurement of energy, describing the total amount of electricity used over time.
Please mark as brainliest.
Answer: True
Watts are a measurement of power, used in light bulbs and other electricity. It is also measured as candela (C) in SI Units. The answer to the question is true because of this measurement.
Hope this helps!
What is the same on the left and right side of a balanced equation? Explain your answer.
Answer:
Number of atoms of elements are same on left and right side of balance equation.
Explanation:
Every chemical reaction must follow the law of conservation of mass. According to which mass can neither be created nor destroy but it change from one to another form. It means mass remain conserved. That is why we need to balance the chemical equation because mass remain same on both side of equation. Consider the example,
Chemical equation:
N₂ + H₂ → NH₃
We can see that nitrogen and hydrogen react with each other and from ammonia. We need to balance the equation to have equal amount on both side.
Balance chemical equation:
N₂ + 3H₂ → 2NH₃
It means mass remain same but change from one to another form.
A balanced equation is one that is having a chemical reaction where the numbers of atoms. Here the number of elements in each reaction and the total charges are the same. This includes both the reactant and the product.
However, the mass and charge are balanced on both sides of the reaction. Hence the left and the right side is always equal to the number of atoms. Thus the chemical reaction is a balance of atoms involved in the reaction.Learn more about the same on the left and right sides of a balanced equation.
brainly.ph/question/20750343.
Is the moons rate rotation that same as earths
Answer:
no
Explanation:
Answer:no
Explanation:The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis.
Which statement describes an intensive property of matter?
Answer:
hope it helped you.
Explanation:
The properties of matter that do not depend on the size or quantity of matter in any way are referred to as an intensive property of matter. Temperatures, density, color, melting and boiling point, etc., all are intensive property as they will not change with a change in size or quantity of matter.
As we will soon see in Section 4.5, gasoline is a complex mixture of alkanes and other hydrocarbons, and the term "octane rating" is used as a standard measure of the performance of engine fuel. In the petroleum industry, one area of interest is the use of catalysts to convert unbranched alkanes and branched alkanes with higher octane ratings (Journal of the Japan Petroleum Institute 2004, 47, 1–10). For example, heptane can undergo isomerization in the presence of suitable catalysts to give eight different constitutional isomers, all of which are branched alkanes with the molecular formula C7H16. Draw all eight constitutional isomers, making sure not to draw the same compound twice.
Answer:
Explanation:
C₇H₁₆ is heptane and it has nine isomers (n-heptane and the remaining 8 constitutional isomers). Constitutional isomers are compounds with the same molecular formula but different structural formula or atom connectivity.
The constitutional isomers of n-pentane are 2-methylhexane, 3-methylhexane, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane, 3-ethylpentane and 2,2,3-trimethylbutane. There structures are in the picture attached
HEEELLLPPPP:(!!!!! im stuckkkk!!!
Answer:
LIGHT
AIR
SHELTER
FOOD
WATER
Answer:
light
air
shelter
food
water
If heat is required for a chemical reaction to occur, from where does the energy come?
Answer:
Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place. Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.
Explanation: