Terbium-147 undergoes positron emission to become a stable atom, the stable atom is ₆₄Gd¹⁴⁷.
What are radioactive decay series?Series (or family) of natural radioactive decay is the set of elements with unstable nuclei, which follow an orderly sequence of spontaneous decay, that is, they emit alpha and beta particles, until a stable lead nucleus is created.
In this case, natural radioactive decay occurs when the nucleus of the atom of some chemical element is unstable and then it "breaks", releasing electromagnetic radiation and disintegrating.
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what is the mass in grams for 7.14x10^3 mol of PCI3?
Answer:
980,536.2 grams
Explanation:
The mass of a compound is equal to its moles times its molar mass.
The molar mass of PCl3 is 137.33 g/mol
137.33 x 7.14 x 10^3 = 980,536.2
Please Hurry And Answer This Question! :)
Which Compound can be used to preserve biological specimens?
1/2/3?
Biological specimens are the preserved remains of the biological materials. Compound A. formaldehyde or formalin is used to preserve the specimens. Thus, option A is correct.
What are fluid-preserved specimens?Fluid preserved specimens are the biological material of the organism that are kept at the store to study and analyze over a long time without getting any damage. Formaldehyde along with alcohol is the most common preservative.
Formaldehyde is an organic compound that is colorless and pungent in the smell that preserves the dead remains of the organisms intact. It is antiseptic and germicide in nature that makes them best for the purpose.
Therefore, option A. formaldehyde is used to preserve the specimens.
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Answer:
so i put a...
Explanation:
Edge doesnt give correct answers on unit tests, but i passed with an 88 :)
Correct me if im wrong!!
All stoichiometry calculations involve what important step?
metric fraction
molar mass fraction
molecules fraction
mole ratio fraction
DONE
Answer:
Mole Ratio Fraction
Explanation:
That's the answer.......
Answer:
DExplanation:
Mole Ratio Fraction
Arrhenius theorized that an acid is a chemical compound that
Answer:
increases the H + ion concentration in aqueous solution
Explanation:
An Arrhenius base is a compound that increases the OH − ion concentration in aqueous solution. Arrhenius theory, theory, introduced in 1887 by the Swedish scientist Svante Arrhenius, that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydroxide ions (OH−). Arrhenius Definition of acids. An acid is a substance that dissociates in water to produce H+ (hydrogen ions) Arrhenius Definition of strong acids. A strong acid is a substance that fully dissociates in water to give hydrogen ions. Arrhenius Definition of weak acids.
what are advantage of using alternatives to fossil fuels?
Answer:
Fossil fuels release greenhouse gases and are non renewable
what is the molarity of liters of an aqueous solution that contains 0.50 mole of potassium iodide, KI
Answer:
The molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.HOW TO CALCULATE MOLARITY:The molarity of a solution can be calculated by dividing the number of moles by its volume. That is;Molarity = no. of moles ÷ volumeAccording to this question, 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide. The molarity is calculated as follows:Molarity = 0.50mol ÷ 2LMolarity = 0.25MTherefore, the molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.Learn more about molarity at: brainly.com/question/2817451
Explanation:
Mark me brainliest please!!! I spent a lot of time on this!!
for now pliss help me
Answer:
the nucleoid
Explanation:
1 Identify Draw an example of a force acting on an object.
Answer:
Answer below
Explanation:
Just draw a photo of someone pushing an object across a table. Your push is the force acting on the object you're pushing.
What will occur when the trough of Wave A overlaps the crest of Wave B?
Destructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.
Constructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.
Destructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.
Constructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.
Answer:
Destructive interference will occur, causing the new wave to have less energy than Wave A or Wave B.
Explanation:
Destructive interference has lesser intensity.
When the trough of Wave A overlaps the crest of Wave B, destructive interference will occur, causing the new wave to have less energy than Wave A or Wave B. Therefore, option C is correct.
What is interference and its types?Interference is the phenomenon that occurs when two or more waves meet and overlap with each other.
There are two types of interference: constructive interference and destructive interference.
Constructive Interference: This occurs when the crest of one wave overlaps with the crest of another wave or the trough of one wave overlaps with the trough of another wave. Destructive Interference: This occurs when the crest of one wave overlaps with the trough of another wave. The resulting wave has a lower intensity, which corresponds to a decrease in energy.Therefore, option C is correct.
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A/an _______ is the smallest unit of matter that has the characteristics of a chemical element. Question 9 options: A) proton B) atom C) molecule D) electron
Answer: atom
Explanation: molecule is a group or two or more atoms
protons and electron are subatomic particles
atom is the smallest unit of matter
What substance(s) do you predict will be able to diffuse through the cell membrane and why?
Consider substances that can easily diffuse through the lipid bilayer of the cell membrane, such as the gases oxygen (O2) and carbon dioxide (CO2). These small, fat soluble gasses and other small lipid soluble molecules can dissolve in the membrane and enter or exit the cell following their concentration gradient.
) experimental evidence indicates that the nucleus of an atom
a) contains most of the mass of the atom
b) contains a small percentage of the mass of the atom
c) has no charge
d) has a negative charge
d) This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
How do I learn a subject easier
Say out loud what you want to remember.
Take notes by hand, not on a computer.
Chunk your study sessions.
Test yourself. A lot.
Change the way you practice.
Exercise regularly.
Get more sleep.
Learn several subjects in succession.
How can you tell if a substance is an acid or base?
Answer:
To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrogen ions
What is the equilibrium constant equation for the chemical process below?
2A + B2 —> A₂B2
Let's see
[tex]\\ \rm\dashrightarrow k=\dfrac{Concentration\:of\: products}{Concentration\:of\: reactants}[/tex]
[tex]\\ \rm\dashrightarrow k=\dfrac{\left[A_2B_2\right]}{\left[A\right]^2\left[B\right]}[/tex]
compare fission and fusions.
what is the molar mass of H,S
Answer:
the answer to your question is 1.00784 u
molar mass of H₂S
= 2.Ar H + 1.Ar S
= 2. 1,00784 u + 1. 32,065 u
= 34.08068 u
When a chemical cold pack is activated, it becomes cool to the touch. What is happening in terms of energy?.
Answer:
An exothermic reaction is happening, it is absorbing the cold.
how do energy sources poly a role in the rock formation?
Sun (radiation), winds (eolic) and water (hydraulic) are all sources of energy that work together during rock formation.
What is rock formation?The rock formation is a very slow process that occurs at a geological time, which may take millions of years.
During this period, rocks are shaped by different types of energy, especially radiation and erosion (wind and water bodies)
In conclusion, the sun (radiation), winds (eolic) and water (hydraulic) work together during rock formation.
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What is a major problem with CFCs?
It is a greenhouse gas.
It does not readily break down in the atmosphere.
It isn't a good refrigerant.
It is toxic to breathe.
The major problem with CFCs is that It is a greenhouse gas, Option A is correct.
What are CFC's ?
Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine.
They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants.
CFCs are classified as halocarbons, a class of compounds that contain atoms of carbon and halogen atoms
The major problem with CFC's is that they are green house gases
It destroys ozone in the upper atmosphere (stratosphere).
CFCs can produce more than 10,000 times as much warming, pound for pound, once they are in the air.
It is not only because of their dramatic warming potential but also
They were found to be the primary cause of the rapidly escalating destruction of the Earth’s ozone layer,
which protects the planet from dangerous, cancer-causing levels of ultraviolet radiation.
Therefore The major problem with CFCs is that It is a greenhouse gas, Option A is correct.
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17. Explain the relationship between atmospheric pressure and the actual boiling point of a liquid.
Answer:
The lower the atmospheric pressure, the lower the boiling point will be. The greater the pressure, the more energy required for liquids to boil, and the higher the boiling point.
Complete the sentence using the word refracting, radlo, or space.
Telescopes that use lenses to bend light are called
telescopes.
Answer:
Refracting
Explanation:
Mark the word bend lightHence light travels through one medium to another it bends down which is called refraction.The bendness depends upon the refractive index of medium.H+ ion concentration of 2.5 x 10-5
Answer:
What is the hydrogen ion concentration of a solution labeled "Solution A", whose pH is 5.60?
Tutorial
In this problem we are given pH and asked to solve for the hydrogen ion concentration. Using the equation, pH = − log [H+] , we can solve for [H+] as,
− pH = log [H+] ,
[H+] = 10−pH,
by exponentiating both sides with base 10 to "undo" the common logarithm. The hydrogen ion concentration of "Solution A" is,
[H+] = 10−5.6 ≈ 0.0000025 = 2.51 × 10−6 M.
We can always check our solution by computing −log (2.5 × 10−6) ≈ 5.6.
Continued deforestation will most likely lead to _______. a. a decrease in the number of endangered species b. an increase in the number of endangered species c. an increase in the number of oil and chemical spills d. a decrease in glacial melting please select the best answer from the choices provided a b c d
Deforestation often leads to an increase in the number of endangered species of plants and or animals.
What is deforestation?Deforestation refers to the conversion of forests to non-forest uses. In other words, it is the removal of forest layers for non-forest reasons.
Since forests represent a hotspot for plant and animal biodiversity, their removal automatically means a decrease in biodiversity.
Endangered species are species of plants and animals that are under the threat of going extinct either due to natural or anthropological effects.
Thus, deforestation often leads to an increase in the number of endangered species.
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Answer:
b
Explanation:
Type the correct answer in the box. given: cac2 n2 → cacn2 c in this chemical reaction, how many grams of n2 must be consumed to produce 265 grams of cacn2? express your answer to three significant figures. the reaction requires grams of n2.
The amount, in grams, of [tex]N_2[/tex] that will be consumed to produce 265 grams of [tex]CaCN_2[/tex] will be 80.61 grams
Stoichiometric calculationFrom the equation of the reaction:
[tex]CaC_2 + N_2 --- > CaCN_2 + C[/tex]
The mole ratio of [tex]N_2[/tex] consumed to [tex]CaCN_2[/tex] produced is 1:1.
Mole of 265 grams of [tex]CaCN_2[/tex] = 265/92.11 = 2.88 moles
Equivalent moles of [tex]N_2[/tex] = 2.88 moles
Mass of 2.88 moles [tex]N_2[/tex] = 2.88 x 28.02 = 80.61 grams
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Identify the acid, base, conjugate acid, and conjugate base in the following reaction:
HSO4- + NH3 = SO4-2 + NH4+
Answer:
Acid: HSO4-
Base: NH3
Conjugate Acid: NH4+
Conjugate Base: SO4-2
Explanation:
HSO4- gives a H+ to NH3 making NH4+ the conjugate acid.
Same can be said to the base.
Justify how dstv has been regarded as an example of a monopoly with the nature of product
When natural conditions are present in a free market then, the natural monopoly arises. Dstv is unique and has no other substituents that make them an example of monopoly.
What is a monopoly?Monopoly is the dominance of a single product, goods, service, business, etc. in the market or the economic sector that excludes the other competitors. They can be the single seller that sells in the business.
DStv is a monopoly in America and includes natural gases, electricity, and communication services. It has no other competitor in the market and has control over others. They are the sole service provider and have no close substitutes.
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How many grams of sodium hydroxide, NaOH, are needed to make 355.0 mL of a 4.75M solution? The molar mass of NaOH is 40.00 g/mol
Answer:
4198.97404999
Explanation:
In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.
If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.
Zinc metal is added to hydrochloric acid to generate hydrogen gas and is collected over a liquid whose vapor pressure is the same as that of pure water at 20.0°C (18 torr). The volume of the mixture is 1.7 L, and its total pressure is 0.788 atm. Determine the number of moles of hydrogen gas present in the sample.
Answer:
About 0.054 moles.
Explanation:
Apply the ideal gas law. Recall that:
[tex]\displaystyle PV = n RT[/tex]
Solve for n, the number of moles:
[tex]\displaystyle n = \frac{PV}{RT}[/tex]
Determine the pressure of the hydrogen gas. Recall that by Dalton's Law of Partial Pressures, the total pressure is equal to the sum of the partial pressures of each individual gas:
[tex]\displaystyle P_T = P_\ell + P_\text{H$_2$}[/tex]
Convert the vapor pressure of the liquid to atm (1.00 atm = 760. torr):
[tex]\displaystyle 18\text{ torr} \cdot \frac{1.00\text{ atm}}{760.\text{ torr}} = 0.024\text{ atm}[/tex]
Therefore, the partial pressure of the hydrogen gas is:
[tex]\displaystyle \begin{aligned} P_T & = P_\ell + P_\text{H$_2$} \\ \\ (0.788\text{ atm}) & = (0.024\text{ atm}) + P_\text{H$_2$} \\ \\ P_\text{H$_2$} & = 0.764\text{ atm}\end{aligned}[/tex]
Therefore, the number of moles of hydrogen gas present is (the temperature in kelvins is 273.15 + 20.0 = 293.2 K):
[tex]\displaystyle \begin{aligned} n & = \frac{PV}{RT} \\ \\ & = \frac{(0.764\text{ atm})(1.7\text{ L})}{\left(0.08206 \text{ }\dfrac{\text{L-atm}}{\text{mol-K}}\right)(293.2\text{ K})}\\ \\ & = 0.054\text{ mol H$_2$} \end{aligned}[/tex]
what type of element is always radioactive?