Abbreviations along with the explanation are shown. Which set used in chemical equations is correct?
O (g). grams
O (aq), dissolved in water
O (1), liters
O, a gas is evolved

However, a tool known as a mass spectrometer allows scientists to quantify relative atomic masses with extreme accuracy.

Chemists frequently need to know which components are in a compound and in what proportions. A specific element's mass in any mass of the compound can be calculated using the percent composition as well. Because the two percentages total up to 100%, the calculations make sense.

With the aid of this formula, one can determine the lowest entire number of moles and the proportional number of atoms of each element present in a compound. The true molecular formula can be calculated by chemists using the empirical formula.

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The equation for finding the mass of a system is:

mass = density x volume

where density is the mass per unit volume of a substance, and volume is the amount of space that a substance occupies.

To use this equation, you need to know the density and volume of the substance in question. For example, if you have a block of iron with a density of 7.8 g/cm^3 and a volume of 50 cm^3, you can find its mass using the equation above:

mass = density x volume

= 7.8 g/cm^3 x 50 cm^3

= 390 g

This means that the mass of the block of iron is 390 grams.

Answer:

[tex] \huge{ \boxed{89.54 \: g}}[/tex]

Explanation:

To find the mass of an object given it's volume and density, we use the formula;

[tex] \bold{density( \rho) = \frac{mass}{volume} \\ }[/tex]

Since the mass is the unknown variable in the question, we make mass the subject and solve.

mass = density × volume

From the question

[tex] \text{mass} = 1.21 \times 74 = 89.54[/tex]

We have the final answer as

The phrase that describes a risk of using the radioisotope Co-60 in treating cancer is "increased biological exposure".

Use of Co-60 in treatment of cancer

The medical use of gamma rays from the radioisotope cobalt-60 to treat conditions such as cancer is known as Cobalt therapy. In the early 1950s, cobalt-60 was widely used in external beam radiotherapy (teletherapy) machines, which produces a beam of gamma rays which was directed into the patient's body to kill tumor tissue and treat cancer.

Hence, the use of Co-60 is now-a-days importantly used to treat conditions like cancer and the phrase used is "increased biological exposure".

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Answer:

A

Explanation:

because it doesn't have the ocean water to gain energy

comprises start, propagation, and termination for a radical addition reaction employing HBr and propene. The following is the reaction:

----> CH3CH=CH2 + HBr + peroxide CH₃CH₂CH₂Br

1) The following actions are included in the initiation steps:

RO - RO ——> ----> 2RO° RO° + H- Br ROH + Br°

2) The propagation steps that are involved in this step are:

CH2 + Br° = CH3 - CH — CH3, CH2, and CH2Br

----> CH3 - °CH - CH2 - Br + H - Br Br + Br° CH3 - CH2 - CH2 -

3) The final phase consists of:

       Br° + Br° ——> Br - Br\s2 Br --->

                CH3 - °CH - CH2 - CH3, CH2, CH2, and Br        

                                 |

                    CH3, CH2, CH2, and Br

Br + Br° ---> CH3 - °CH - CH2 - CH3 - CH - CH2 - Br | Br

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Considering the Charles's law, the correct answer is the third option: if the volume is doubled at constant pressure and the same amount of gas particles, the temperature will be doubled.

Charles' law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. Jack Charles observed that when the temperature was increased the volume of the gas also increased and that as it cooled the volume decreased. That is, the volume is directly proportional to the temperature of the gas.

Mathematically, Charles' law states that if the amount of gas and the pressure remain constant, the ratio between the volume and the temperature always has the same value:

V÷T=k

where:

V is the volume.

T is the temperature.

k is a constant.

Considering an initial state 1 and a final state 2, it is fulfilled:

V₁÷T₁= V₂÷T₂

In this case, the volume is doubled at constant pressure and the same amount of gas particles. This is, V₂= 2×V₁

Replacing in the Charles' law:

V₁÷T₁= 2×V₁÷T₂

(V₁÷T₁)×T₂= 2×V₁

T₂= 2×V₁ ÷(V₁÷T₁)

T₂= 2×T₁

Finally, the temperature will be doubled.

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The true statement about the two atoms X and Y is

The correct option is B.

The atomic number is the difference between the mass number and the neutron number.

Atomic number = mass number - neutron number

The atomic number and mass number of the given atoms X and Y are as follows:

Atom X:

mass number = 12,

neutron number = 6

atomic number = 12 - 6

atomic number = 6

Atom Y:

mass number = 13

neutron number = 7

atomic number = 13 - 7

atomic number = 6

X and Y have the same atomic number but different mass numbers. Hence, they are isotopes.

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The final temperature of the water is 43.92°C.

What is specific heat capacity?

The specific heat is defined as amount of energy in the form of heat to change heat content of 1 gram of substance by one-degree Celsius temperature.

Specific heat capacity of water = 4.184J/g°C

heat (q) = 437.7 J

Initial temperature = 23°C

Final temperature = T

mass of water = 5.00g

using the equation: q= mₓcₓΔT

437.7 = 5ₓ4.184ₓ(T- 23.0)

(T-23.0) = 437.7/ (5ₓ4.184)

T= 23.0°C +20.92°C = 43.92°C

T= 43.92°C

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a situation when opposing forces or actions are in equilibrium, whether that balance is static (such as when forces are applied to a body and the resultant is zero) or dynamic (such as in a chemical process that is reversible when the velocities in both directions are equal): a condition of mental or emotional equilibrium.

What is a simple definition of equilibrium in chemistry?

When the rates of the forward and backward reactions are identical, chemical equilibrium is reached. In other words, there is no net change in the reactant and product concentrations.

Equilibrium in chemicals is a dynamic process. Even after equilibrium has been attained, the forward and reverse reactions still happen. However, for a reaction that is at equilibrium, there is no change in the relative concentrations of reactants and products because the reaction rates are the same.

The reaction, though, continues unabated. Instead, the process reaches a state of chemical equilibrium where the forward reaction is producing products as quickly as the reverse reaction is converting reactants into products.

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The radius of a helium atom is 4.8 times the radius of an alpha particle.

What is alpha particle?

Alpha particles, also called alpha rays and alpha radiation, have a structure similar to that of the helium-4 nucleus, consisting of two protons and two neutrons bonded together.

What is helium?

Helium has been used as an inert gas environment for welding metals such as aluminum. It is also used for rocket propulsion.

The radius of a helium atom is 4.8 times the radius of an alpha particle. The diameter of the nucleus of the helium atom, an alpha particle, was also measured more accurately than ever before. The results only show a size of 1.6782 femtometers, making him 4.8 times more accurate than previous measurements.

Therefore, The radius of a helium atom is 4.8 times the radius of an alpha particle.

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In an emission spectrum, the amount of visible light emitted during heating of metals is proportional to the number of protons and neutrons present in the nucleus.

Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.

Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.

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The equation for the reaction that will occur when each pair of substances is allowed to react:

a) 2HBr+ Mg(OH)2⇒MgBr2+2H2O

b) H3PO4+KOH⇒KH2PO4+H2O

c)NH4OH+H2SO4⇒(NH4)2SO4+2H2O

What is neutralisation reaction?

When an acid and a base interact chemically, the process is known as neutralisation or neutralisation. In a process in water, neutralisation leaves the solution with no excess of hydrogen or hydroxide ions.

In all three reactions acid reacts with base to produce salt and water.

Acid+Base⇒Salt+Water

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Answer:

Boron and argon have 3 and 8 valence electrons respectively.

Aluminum and calcium have 3 and 2 valence electrons respectively.

Explanation:

Please give the brainliest.

Oxygen can be present or absent during cellular respiration. Because the cell appears to breathe in molecular oxygen and exhale carbon dioxide, the process is known as cellular respiration.

Any atoms joined by chemical bonds are referred to be molecules in general. A molecule is made up of any two atoms together. A molecule consisting of atoms from various elements is referred to as a compound. Although all molecules are compounds, not all compounds are molecules.

Nucleic acids, lipids, proteins, and carbohydrates make up the four basic building blocks of life. Each and every one of the 4 categories is essential for every living thing on Earth. A cell or organism could not survive without any one of these four molecules.

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Retrosynthetic analysis is a method for resolving issues with organic syntheses' planning. To do this, a target molecule is converted into less complex precursor structures.

The molecule whose synthesis is being planned is known as the target molecule. Deconstructing a target is the process of retrosynthesis.

One of the most typical methods in synthetic chemistry is functional group interconversion (FGI) reactions. Cinnamic aldehyde is converted into two distinct products in this experiment by reduction with LiALH4, depending on the sequence in which the reactants are added.

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The percent of the mass in a sample of zinc sulfate that comes from zinc would be 40.50%. Option 5.

The percent composition of a component in a substance is the ratio of the mass of the component and the mass of the substance itself.

This can be mathematically expressed as;

Pecent composition= mass of component/mass of substance x 100%

In this case, the substance is zinc sulfate, a compound that contains zinc, sulfur, and oxygen in a ratio 1:1:4.

The molar weight of zinc is 65.38 while the molar mass of the entire zinc sulfate is 161.442.

Thus, the percent of the mass of any sample of zinc sulfate that comes from zinc would be:

Percent zinc = 65.38/161.442 x 100

                    = 40.50%

In other words, the percent of zinc in any zinc sulfate sample would be 40.50%

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242 grams more iron were found to be present in a 500 gram sample of iron ore. 48.4 mass percentage of iron is present in the ore.

To get the mass percent of a component of a compound, divide the result by 100 after dividing the mass of the component in 1 mole of a complex by the compound's molar. Although certain ores include quite so much as 66 % iron, the majority are in the 50–60 %, making deposits with less that 30 % iron commercially unappealing. The other components of an ore, referred to as gangue as a whole, can also affect the quality of the ore. 60% to 70% of haematite is made entirely of iron ore. 40% to 60% of limonite is pure iron. Siderite only contains 40% - 50% pure iron and is heavily contaminated. Iron ore in haematite is 60–70% pure iron. In limonite, there is 40–60% pure iron. Siderite has several impurities.

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ok

l. will give you two apple you have two equals to four 2+2=4

Metals and non-metals come together to produce CaO ionic bonds. The only metals and non-metals, respectively, are calcium and oxygen. The remaining choices are covalent bonding (bonds between non-metals).

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The maximum mass of magnesium used in its reaction with HCl is 0.08gm so the total pressure does not exceed 1.5 atm.

We will use ideal gas laws to solve this

For the final pressure, P = 1.5 atm

Change in pressure = 1.5-1

= 0.5 atm

Volume = 0.161L

T= 298K

The equation of state for a synthetic perfect gas is known as the ideal gas law, sometimes known as the generic gas equation. Although it has significant drawbacks, it is a decent approximation of the behavior of many gases under various conditions.

Only an ideal gas or a real gas that behaves enough like an ideal gas can be approximated by the equation of state presented here (PV = nRT). The equation of state can be expressed in a wide variety of ways.

Let the moles of H, produced then

Using ideal gas law

P×V= n×R×T

0.5 × 0.161 = n × 0.0821 × 298

n=0.00329

Mg+ 2HCl⇒ Mg.Cl2 + H₂

Moles of H, 0.00329 1 mole of Mg gives 1 mole of H

Therefore, number of moles of Mg-0.0329

Mass of Mg=0.00329 × 24.3

Mass of Mg=0.08 gm

The maximum mass of magnesium used in its reaction with HCl is 0.08gm so the total pressure does not exceed 1.5 atm.

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Answer:

To calculate the kinetic energy of an object, we use the formula KE = 1/2 * m * v^2, where KE is the kinetic energy, m is the mass of the object, and v is the velocity of the object. In this case, the kinetic energy of the cart would be calculated as follows: KE = 1/2 * 800 kg * 10 m/s^2 = 4000 J.

Explanation:

However, it's important to note that the kinetic energy of an object depends not only on its mass and velocity, but also on its height. In the case of a cart moving down a slope, the potential energy it has due to its height will be converted into kinetic energy as it moves. Therefore, in order to accurately calculate the kinetic energy of the cart, we would need to know its height relative to some reference point (such as the ground), as well as its velocity.

When an atom from group 2 of the periodic table(say X) reacts with an atom of group 17(say Y), then the general formula is XY₂.

The elements present in group 2 of the periodic table (Be, Mg, Ca, Sr, Ba, Ra) are metals having valency 2. On the other hand, the elements present in group 17 ( F, Cl, Br, I, At, Ts) are halogens or non-metals having valency 1. So, elements from both these groups combine together by transfer of electrons, forming an ionic bond between them.

The general formula is formed by exchange of valencies.

here, valency of X=2, Y=1

Thus, the general formula is XY₂

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Lewis structures are a simple shorthand representation of the bonding of atoms and the distribution of Valence electrons in molecules and polyatomic ions of the main-group elements.

The electrons in an atom's outer shells, or energy level, are called valence electrons. For instance, the valence electrons of oxygen are six, with 2 with in 2s subshell and 4 with in 2p subshell. The valence electron configuration of oxygen can be expressed as 2s²2p4.

Core electrons are those in filled orbitals that are located closest to the nucleus. Valence electrons are simpler to separate than core electrons because they are away from the positive ion (the proton) and so require less energy to travel out from the atom than core electrons.

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Si-30 has a 29.974 amu atomic mass and a 3.1% abundance. and silicon's typical atomic mass is 28.09 AMU.

The amount of matter that makes up an element's atom, or atomic mass. It is stated as a multiple of 1.992646547 1023 gram, which is equal to one-twelfth of the mass of the carbon-12 atom, which has an atomic mass of 12 units.

The mass of a single atom or isotope is referred to as its "atomic mass." An element's average weight compared to all of its isotopes and their proportionate abundances is known as its atomic weight. Isotope atomic masses have no bearing on atomic mass.

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Answer:

look below

Explanation:

If the temperature of a gas in a sealed container with a fixed number of molecules is increased, the gas will expand. This is because the increased temperature will cause the gas molecules to move more quickly and collide more frequently with the walls of the container. These collisions will exert a greater force on the walls of the container, causing the volume of the container to increase.

If the volume of the container is allowed to vary (i.e., if it is not sealed), then the volume of the container will increase as the temperature is increased. The exact increase in volume will depend on the size of the container and the specific gas that is being heated.

If the temperature of a gas in a 2.0 L sealed container is doubled, the volume of the container will increase, but it is not possible to determine the exact increase in volume without knowing the specific gas that is being heated and the pressure and temperature at which the gas was originally contained.

The major conformer in ethane is Eclipse Conformation. Another clockwise rotation at an angle of 60 degrees would lead to second eclipsed conformation.

What is ethane?

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