An isotope of cesium (cesium-137) has a half-life of 30 years. if 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain?

Li₂SO₄+2H₂O is the result of the balanced chemical reaction, which is 2LiOH+H₂SO₄.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.

Consequently, the balanced chemical equation is; For a balanced chemical reaction, the number of atoms of a given element on the left hand side should match the number of atoms of that element on the right hand side.

2LiOH+H₂SO₄ → Li₂SO₄+2H₂O

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The anhydrous cobalt chloride is blue in color and it absorbs water, on reaction with water it turns pink in color.

A chemical reaction is defined as a process that lead to chemical transformation of one set of substances to another set.

There are basically four types of chemical reactions.

The reaction between anhydrous cobalt chloride and water is also one of the chemical reaction.

Thus, anhydrous cobalt chloride is blue in color and it absorbs water, on reaction with water it turns pink in color.

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There are 7.0 x 10^22 C2H5OH molecules in the sample.

Ethanol (also referred to as ethyl alcohol, grain alcohol, consuming alcohol, or actually alcohol) is an organic chemical compound. It is simple alcohol with the chemical system C2H6O. Its method can be also written as CH3−CH2−OH or C2H5OH (an ethyl team linked to a hydroxyl group) and is regularly abbreviated as EtOH. Ethanol is a volatile, flammable, colorless liquid with an attribute wine-like odor and pungent taste. It is a psychoactive drug, a leisure drug, and an energetic ingredient in alcoholic drinks.

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while a capacitor has a capability distinction between the plates it's miles said to be consistent.

each plates have different fee which means that one has better ability than the other.

V= potential distinction across the plates , when the capacity distinction V is improved , rate on capacitors additionally will increase such that the ratio Q/V , remains consistent i.e. capacitance remains consistent . due to the fact capacitance relies upon upon plate location , medium between plates and distance among plates .

consequently, whilst we be a part of them in parallel, charge will float from better to lower. and it continued to go with the flow until equilibrium (the whole method took just a few seconds), indicating that the capacity remains consistent.

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Carbon (C) contains the largest number of moles.

Number of Moles of a substance can be defined as the ratio of given mass of the substance to the Molecular Mass of the substance.

We can write,

Number of moles = Given Mass / Molecular Mass                euation1

Given Mass of Na, C, Pb, Cu, Ne each = 10.0g

Molecular mass of Na = 22.9898 u

Molecular mass of C = 12u

Molecular mass of Pb = 207.2u

Molecular mass of Cu = 63.546 u

Molecular mass of Ne = 20.1797 u

After substituting the values of molecular mass and given mass of elements in equation1 , we will get

Number of moles of Na = (10/22.9898) = 0.4350

Number of moles of C = (10/12) = 0.8333

Number of moles of Pb = (10/207.2) = 0.0483

Number of moles of Cu = (10/63.546) = 0.1574

Number of moles of Ne = (10/20.1797) = 0.4955

So, we can clearly see that Carbon contains the largest number of moles.

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The person will live  73.62 years

The heartbeats 80 times in 1 minute

Therefore , 1 heartbeat takes [tex]1/80 minutes[/tex] time

In whole life number of heartbeats = [tex]3.1* 10^{9}[/tex]

Thus, time in which [tex]3.1* 10^{9}[/tex] heart beat will occur = [tex]3.1* 10^{9} * 1/80 minutes[/tex]

                                                                                  = [tex]0.03875 * 10^{9}[/tex] minutes

Since 1 minutes =[tex]1.90259 * 10^{-6}[/tex] year

Therefore,  [tex]0.3875 * 10^{9}[/tex] minutes = [tex]0.03875 * 10^{9}[/tex] * [tex]1.90259 * 10^{-6}[/tex] year

                                                     = [tex].073625* 10^3[/tex] years

                                                     = 73.62 years

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Answer:

See explanation

Explanation:

1) a precipitate of lead chloride would be observed if the concentrations of both reagents was high enough and the temperature was low enough
2) A gelatinous white-ish precipitate would be observed at first, though i'm not sure what would happen with excess ammonia. The precipitate would likely not dissolve in excess ammonia

A singlet, a triplet, and a quartet multiplicities are observed for the signals in the off-resonance decoupled 13c NMR spectrum of 2-chloropropene.

A phenomenon in which an external force or vibrating system causes another system around it to vibrate with greater amplitude at a particular operating frequency. The concept of resonance would be difficult to understand without an example. The resonance energy is defined as the difference between the electronic energy of the real (conjugated) molecule and the virtual Kekulé structure in which the bond is localized.

Resonance occurs when the frequency of the applied force is equal to one of the natural frequencies of vibration of the forced or driven harmonic oscillator. Swings, guitars, pendulums, bridges, and musical systems are examples of resonance in everyday life.

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The reaction best illustrates the behavior of the weak base h₂po₄- in an solution is:H₂PO₄ (aq) + H₂O (l) ↔ H₃PO₄ (aq) + OH- (aq)

What is a weak base?

A weak base is a base that, upon dissolution in water, doesn't dissociate completely, therefore the resulting aqueous solution contains only a small proportion of hydroxide ions and the concerned basic radical and a large proportion of undissociated molecules of the base.

Contents 1 pH, Kb, and Kw 2 Percentage protonated 3 A typical pH problem.

Examples of Weak Bases.

Ammonia (NH₃) Ammonia could also be a chemical compound with the formula NH ₃. it is a weak base which exists as a colour less gas under standard conditions for ...

2 Trimethylamine (N (CH₃) ₃)₃ Pyridine

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The balanced chemical equation for the reaction occurs when dimethyl ether, ch3och3(g), is combusted in air.

CH3OCH3(g) + 3O2(g) ----> 2CO2(g) + 3H2O(l)

A chemical is a substance with a defined composition. That is, chemicals are always made up of the same "things". Some chemicals are found in nature, such as water. Other chemicals are also manufactured, such as chlorine (used in bleaching fabrics and in swimming pools).

There are four main types of compounds, distinguished by how the atoms are bonded together. Molecular compounds are bound by covalent bonds. Ionic compounds are held together by ionic bonds. Intermetallic compounds are held together by metallic bonds. Coordination complexes are held together by coordinate covalent bonds. Non-stoichiometric compounds form a controversial edge case.

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Polar covalent bonds are the type of covalent bond found between oxygen and hydrogen in water molecules

Water is a Polar Covalent Molecule

The choppy distribution of electrons among atoms and the uneven form of the molecule way that the water molecule has poles - a superb price at the hydrogen pole (side) and an oxygen Negative price at the poles (flanks)).

A water molecule includes hydrogen atoms covalently bonded to the equal oxygen atom. Oxygen atoms are electronegative and entice covalent electrons in covalent bonds.

The bond among the oxygen and hydrogen atoms withinside the water molecule is a polar covalent bond. H. Electrons aren't shared similarly among oxygen and hydrogen. Oxygen has a better affinity for electrons than hydrogen.

A polar covalent bond is a bond wherein the electron pairs are shared similarly among the 2 bonding atoms, and a polar covalent bond is a bond wherein the electron pairs are shared unequally among the 2 bonding atoms. Polar bonds are a result of variations in electronegativity.

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It is true that the iron recommendation for girls exceeds that of boys during adolescence.

During an adolescence, girls and boys require iron for a large growth spurt and the gain of adult phenotypes and biologic rhythms.

In this period of the life, iron recommendation increase in both girls and boys, because of the increase in lean body mass, the expansion of the total blood volume, the increase and start of menstruation at girls.

Iron is essential for oxygen transport, red blood cell creation, cognitive performance and immunological function.

The overall iron requirements for girls are up to twice as boys.

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The another name for relative abundance is Percent Composition

So, option A is correct

The relative abundances of all the stable isotopes of an element always add up to 100% since relative abundances are typically reported as percentages. A weighted average of these numbers determines the average atomic mass of an element.

The fraction of an isotope that is present on earth is quantified as its percentage abundance. It provides the amount of that specific isotope. The fraction of an isotope species in relation to all other elements in nature is known as relative abundance.

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The frequency of a photon with a wavelength of 360 nm frequency of a photon is 8.33 × 10¹⁴ s⁻¹.

Given,

The wavelength of photon = 360 nm or 3.60 × 10⁻⁷

three × 10⁸ m/s is the speed of mild.

We need to discover the frequency of a given photon.

The frequency of a photon is described as the wide variety of waves that pass via a set point in a unit of time.

therefore, f = c/λ

where f is the frequency, c is the velocity of light, and λ is the wavelength of the photon.

f = 3 × 10⁸/ 3.60 × 10⁻⁷

Or, f = 0.8333 × 10¹⁵ s⁻¹

Or, f = 8.33 × 10¹⁴ s⁻¹

Hence, the frequency of the photon is 8.33 × 10¹⁴ s⁻¹.

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1.843 cm is the inner diameter of a 21.0 cm long cylindrical glass tube.

What is inner diameter of a cylinder?

Two times the wall thickness of the pipe is subtracted from the total exterior diameter to determine the inner diameter of the pipe. By removing the pipe's walls from the computation, just the internal diameter remains.

Lets volume of tube be V

V = 44.23/0.789

calculate by using conversion factor= 56.058 cm^3

Volume of cylinder = πr^2h

⇒ r^2= [tex]\frac{V}{\pi h}[/tex] ,

⇒ r = [tex]\sqrt{\frac{V}{\pi h}}[/tex]

⇒ r = [tex]\sqrt{\frac{56.058 }{\pi 21}}[/tex]

⇒ r = 0.9215 cm

And as we have radius, we can calculate diameter

d = 2r   = 2 × 0.9215 cm   = 1.843 cm

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Answer:

C. Motion

Explanation:

Potential energy is the energy stored within an object.

Kinetic energy is the energy an object posesses due to its motion.

A chemist tests the quality of a brand of soft drink. The branch of chemistry he might use out of Analytical chemistry, physical chemistry, biochemistry, organic chemistry, and inorganic chemistry is analytical chemistry.

What are the branches of chemistry?

Analytical chemistry, physical chemistry, biochemistry, organic chemistry, and inorganic chemistry are thought to constitute the five main branches. The study of compounds of carbon and itself is called organic chemistry. The study of substances not included in organic chemistry is known as inorganic chemistry. The study of matter's chemistry and the creation of instruments to quantify matter's properties are both aspects of analytical chemistry. The field of chemistry known as "physical chemistry" uses physics to the study of chemical reactions. This often involves using thermodynamics and quantum mechanics to research chemistry. The study of chemical reactions that take place within living things is known as biochemistry.

Thus, the branch of chemistry a chemist uses to test the quality of a brand of soft drink is analytical chemistry.

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The foreign substance responsible for causing an allergic reaction is called an allergen.

The exaggerated reaction of our body’s immune system to certain foreign substances is known as an allergy.

The symptoms of allergy are sneezing, watery eyes, running nose, and difficulty in breathing which occur due to the release of certain chemicals like histamine and serotonin in our body.

The foreign substance that causes allergy is called an allergen.

Common examples of the allergens are pollen grains of certain plants, animal dander, and food items like peanuts, mushrooms etc.

To control the symptoms of allergy, drugs like antihistamines and steroids are used.

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The ph scale is based on the number of hydroxyls in the solution.

What are hydroxyls?

Chemistry and biochemistry both use the hydroxy group extensively. The chemical product generated on the largest industrial scale, sulfuric acid, among many other inorganic substances, contains hydroxy groups.

In the dehydration events that form lengthy chains out of simple biological molecules, hydroxy groups take part. A fatty acid's carboxy terminus loses its OH group when it is joined to glycerol to create a triacylglycerol. The carboxy group at the aldehyde end of one sugar loses its OH group when two aldehyde sugars are joined to create a disaccharide. The carboxy group of one amino acid loses the OH when a peptide bond is formed to join two amino acids to form a protein.

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The mass of nitrogen contained in 70.0 g of C6H5NO3 is 7.05g.

The mass of an element in a compound can be calculated by dividing the molar mass of the element by the molar mass of the compound multiplied by the mass of the compound.

According to this question, 70.0 g of C6H5NO3 is contained in a substance.

Molar mass of nitrogen is 14g/mol

Mass of nitrogen = 14g/mol/139.11g/mol × 70g

mass of nitrogen = 7.05g

Therefore, the mass of nitrogen contained in 70.0 g of C6H5NO3 is 7.05g.

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Scientific investigations can be used to reach the solution to the problem. The hypothesis of the experiments can be performed and the results and findings should be reported. Thus, option A is correct.

Scientific investigations have been defined as the series of steps that are used to solve the question and test the hypothesis to reach the solution. It uses logical means to experiment and research the topic.

After conducting an experiment the observed data, results, and findings must be reported so the process and the technical results can be used to define the issue or the problem that acts as a conclusion.

Therefore, option A. Rick must report his findings.

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Your question is incomplete, but most probably your options were,

A. Report his findings.

B. Throw away his experiment notes.

C. Report that squid swims faster in warm water.

D. Change his hypothesis.

The key difference between free radical and ion is that the free radicals have one or more unpaired electron, but ions have paired electrons.

What is the Paired and Unpaired Electrons?

Unpaired electrons are the ones that appear in an orbital alone, while paired electrons are the ones that appear in an orbital as pairs in an atom. So, in the orbital, paired electrons always appear as two electrons, whereas unpaired electrons always appear as a single electron. The main distinction between paired and unpaired electrons is this. Additionally, whereas unpaired electrons result in paramagnetism or ferromagnetism in atoms, paired electrons cause diamagnetism in atoms.

A change in the orbital motion of electrons caused by an applied magnetic field induces diamagnetism, a very weak form of magnetism. This magnetism is transient and only endures when an outside field is present.

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The percent yield of KOH is 78.7%.

Balanced chemical reaction:

4KO₂ + 2H₂O → 4KOH +3O₂

m(KO₂) = 22.4 g; mass of the oxide

m1(KOH) = 13.9 g; mass of the potassium hydroxide produced

n(KO₂) = 22.4 g ÷ 71.1 g/mol

n(KO₂) = 0.315 mol; amount of the oxide

From chemical reaction: n(KO₂) : n(KOH) = 1 : 1

n(KOH) = 0.315 mol; amount of the potassium hydroxide

m(KOH) = 0.315 mol x 56.1 g/mol

m(KOH) = 17.67 g; a theoretical yield of KOH

the percent yield = 13.9 g / 17.67 g x 100%

the percent yield = 78.7%

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There are actually two models of electromagnetic radiation. One is the wave model, of course, and the other is the particle model, which postulates that radiation is made up of a stream of discretely sized particles called light quanta.

Different ideas about the energy connected to radiation are produced by the two theories.

The energy is stored in the EM fields that are moving through a region when the radiation is thought of in the wave model as an EM wave.

The wave oscillations in the wave model hold the energy.

Conceptually, the particle model differs slightly. Since each discrete particle in radiation has a specific amount of energy, the total energy of the radiant beam is determined by the number of discrete particles that make up the radiation.

In this scenario, the energy of each quantum is denoted by the formula E = h v, where h is Planck's constant.

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Explanation:

The degree of deflection directly relates to the mass of the ion: the lighter the ion, the greater the deflection and the heavier the ion, the lesser the deflection. The beam of ions is then detected

and the relative abundance of each isotope of an element canthen be determined.

please mark as brainliest

The greater the mass of the isotope lesser will be the amount of deflection. The amount of deflection is related to the mass of the isotope.

An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties.

As each isotope has a different mass number, this number is written after the element name for the atom. For example, an atom of carbon with a mass number of 12 will be labeled as an atom of carbon-12. Carbon-13 and carbon -14 is also examples of carbon atom.

Thus, the greater the mass of the isotope lesser will be the amount of deflection. Deflection is depend upon the mass of atom.

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Calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] )is the limiting reactant for the reaction.

This is fewer than the 2.4 moles of lithium phosphate [tex]Li_{3} PO_{4}[/tex] that are readily available. This indicates a deficiency in calcium nitrate[tex]Ca(NO_{3})_{2}[/tex]. 2.4 moles of lithium phosphate must be added in order to complete the reaction.

As a result, calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] is the limiting reagent and lithium phosphate[tex]Li_{3} PO_{4}[/tex] is in excess. The availability of Calcium Nitrate [tex]Ca(NO_{3})_{2}[/tex] is lesser than the 2.4 moles of lithium phosphate [tex]Li_{3} PO_{4}[/tex] that are accessible. This indicates that present amount of calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] is inadequate to completely react with 2.4 moles of lithium phosphate[tex]Li_{3} PO_{4}[/tex]. Thus, calcium nitrate [tex]Ca(NO_{3})_{2}[/tex] is the limiting reagent and lithium phosphate [tex]Li_{3} PO_{4}[/tex] is in excess.

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Answer:

C

Explanation:

For electromagnetic waves frequency X wavelength = speed of light

                                                f * 2.2 x 10^-11  = 3 x 10^8  m/s

                                         f = 3 x 10^8 / 2.2 x 10^-11

                                            = 1.36 x 10 ^19

                                             = 1.4 x 10^19   with two significant digits

Answer: it's not C, it is A.

Acetylcholine binds to receptors on muscle fibers which open ion channels (allowing ions to move along their concentration gradient). This is an example of passive transport.

Passive transport is a  biological phenomenon of movement that does not require external energy from the cell. It is the movement of ions or other chemical substances within the cells.

This movement happens along the concentration gradient. The chemical substance moves from high concentration to low in this phenomenon. simple and facilitated diffusion that happens in the cell are also types of passive transport. Other than that, passive transport also includes Filtration and Osmosis.

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Explanation:

Using the law of the conservation of linear momentum P:

P_i = P_fP

i

=P

f

so:

M_mV_{mi}+M_pV_{pi} = M_sV_sM

m

V

mi

+M

p

V

pi

=M

s

V

s

where M_mM

m

is the mass of the man, V_{mi}V

mi

is the initial velocity of the man, M_pM

p

is the mass of the puck, V_{pi}V

pi

is the initial velocity of the puck, M_sM

s

is the mass of the puck and the man and V_sV

s

is the velocity of both after the collition.

Replacing values, we get:

(80kg)(0m/s)+(0.17kg)(20m/s) = (80kg + 0.17kg)V_s(80kg)(0m/s)+(0.17kg)(20m/s)=(80kg+0.17kg)V

s

Finally, solving for V_sV

s

:

V_sV

s

=0.0424m/s

The items can be used to control the boiling when heating liquid is in a round bottom flask are boiling chips or stones,a stir bar and stir plate.

What is Boiling?

When a liquid is heated to its boiling point, which is the temperature at which the vapour pressure of the liquid equals the pressure placed on it by the surrounding atmosphere.

Because they provide even boiling and stop the solution from boiling over, boiling stones are very helpful in chemical labs. These chips are designed to be porous in order to permit the formation of solvent vapors in the air cavities.

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