Which statement about a chemical reaction supports the claim that mass is conserved?.

Answer:

The answer is “They supported the use of radioactive elements for medical diagnostic purposes”.

Answer:

They supported the use of radioactive elements for medical diagnostic purposes.

Explanation:

(Its a recorded fact)

E compounds have their highest priority substituents on opposite sides of the double bond, while Z compounds have their highest priority substituents on the same side of the double bond.

An E (entgegen) compound is a type of stereoisomer where the highest priority substituents on each carbon of the double bond are on opposite sides of the molecule. In contrast, a Z (zusammen) compound is a stereoisomer where the highest priority substituents on each carbon of the double bond are on the same side of the molecule.

To determine E or Z configuration, follow these steps:
1. Identify the double bond in the molecule.
2. Assign priorities to the substituents on each carbon of the double bond using the Cahn-Ingold-Prelog priority rules (higher atomic number = higher priority).
3. Observe the relative positions of the highest priority substituents.
4. If the highest priority substituents are on opposite sides, the compound is E. If they are on the same side, the compound is Z.

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The best choice for screening a person's genetics for 1,000 or more genes would be: C. Sequencing.

Sequencing techniques, such as next-generation sequencing (NGS), are well-suited for screening a large number of genes efficiently and comprehensively. NGS allows for high-throughput sequencing of DNA, enabling the simultaneous analysis of multiple genes or even the entire genome. It provides detailed information about the sequence of nucleotides in the DNA, allowing for the identification of genetic variations, mutations, or other genomic features.

Microarray analysis (A) is a technique that can analyze gene expression patterns or detect specific genetic variations, but it is limited in the number of genes it can assess simultaneously compared to sequencing.

RELP analysis (B) is a technique used for detecting genetic variations based on restriction enzyme digestion patterns, but it is more suitable for specific target regions rather than screening a large number of genes.

Karyotyping (D) involves the visualization and analysis of chromosomes to detect large-scale chromosomal abnormalities but is not suitable for screening a large number of individual genes.

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The balanced equation for the neutralization reaction between NaOH and H2SO4 can be given as follows: H2SO4 + 2NaOH → Na2SO4 + 2H2OThe stoichiometry of the reaction shows that 1 mole of H2SO4 reacts with 2 moles of NaOH.

We can calculate the moles of NaOH that reacted as follows:0.164 M NaOH = 0.164 moles/Liter

Therefore, the number of moles of NaOH present in 32.63 mL can be calculated as follows:

0.164 moles/L * 0.03263 L

= 0.00535 moles

Now we know that 0.00535 moles of NaOH were present in 25.00 mL of H2SO4. Since the stoichiometry shows that 1 mole of H2SO4 reacts with 2 moles of NaOH, we can calculate the number of moles of H2SO4 that were present in 25.00 mL of H2SO4 as follows:

0.00535 moles of NaOH * 1 mole of H2SO4/2 moles of NaOH

= 0.002675 moles of H2SO4

Now that we know the number of moles of H2SO4 present in 25.00 mL of solution, we can calculate the molarity of the solution as follows:

Molarity = Moles of solute/Volume of solution (in liters)

Molarity = 0.002675 moles/0.02500 Liters

= 0.107 M H2SO4

Therefore, the molarity of the H2SO4 solution is 0.107 M.

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Answer:

The cyclist must be fed in order to continue to pedal because food will. provide him/her with energy to continue with it.

Answer:

A molecular compound is usually composed of two or more nonmetal elements. Molecular compounds are named with the first element first and then the second element by using the stem of the element name plus the suffix -ide.

Answer:

triangles

Explanation:

Answer:0.1C

Explanation:

Answer: It is 1

Explanation: Got it correct on Acellus hope it helps!

Answer:

combining wax

Explanation:

Candles burn through an efficient combustion process by combining wax, a poor conductor of heat that melts just above room temperature, with a wick, an absorbent material that will absorb liquid wax and transfer it toward the candles flame while its burning. when a candles wick is lit, the heat from above it. and I'm not a good explainer sorry if I got it wrong

Answer:

B cells and T cells. The B cells produce antibodies that are used to attack invading bacteria, viruses, and toxins. The T cells destroy the body's own cells that have themselves been taken over by viruses or become cancerous.

Explanation:

The anticodons corresponding to the codons on the mRNA (from part A) is 5' CGA - AAA - GUU 3'.

Anticodons are nucleotide sequences on tRNA molecules that are complementary to the codons found on mRNA molecules.

The anticodons on tRNA molecules determine the amino acid that is carried by the tRNA.

Just like codons, anticodons occur in triplets of nucleotide sequences.

Considering the codons on the mRNA molecule:

3’ GCT | TTT | CAA | AAA ’5

The complementary anticodon will be:

5' CGA - AAA - GUU 3'

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Answer:

The California Condor is on the verge of extinction. There were three individuals, all males, known to be living free in late 1986. That was a drop from fifteen wild birds (including five breeding pairs) known to have been present in 1984. Twenty-one condors were also alive in captivity toward the end of 1986.

Explanation:

Answer:

There are 5 steps/rules of the ideal gases based on kinetic theory.

Explanation:

1. Particles in a gas are constant moving in random motion.

2. combined volume of the particles is negligible.

3. particles exert no forces on one another

4. any collisions between the particles are completely elastic

5. the average kinetic energy of particles is proportional to temperature in kelvins.

(I had help explaining steps from Sal Khan. I hope this helps! Have a great day!)

Answer:

Physical properties are defined as the properties which can be observed without changing its chemical composition.

For example: color, volume, and molecular weight.

Chemical properties are defined as the properties which can be observed only after changing chemical identity of the substance.

For example: reactivity, toxicity, and flammability.

The fundamental differences between physical and chemical properties are as follows:

Chemical properties are related to chemical bonds of the substance while physical properties are not.

In chemical properties, chemical identity of substance changes while physical properties do not have any change.

Chemical properties predict the reaction of substance while physical properties only describe the appearance of the substance.

Explanation:

Answer:

A measurable property that can be observed typically and explains any matter or organism's appearance and physical behavior is called a physical property. Examples of physical properties are appearance, boiling point, freezing point, melting point, colors, odor, mass, density, solubility. Properties that are only observed during a reaction or change in the composition of a matter is called a chemical property. These properties describe the internal part of anything and explain how it behaves when reacted with other chemical substances. Examples are enthalpy, entropy, reactivity, flammability, oxidation state, acidity, basicity. Some physical properties are reversible or sometimes irreversible. Like the change of states of matter is reversible, and the growth of an organism is irreversible. The same thing with the chemical properties. There are reversible chemical reactions(formation of ammonium chloride) and irreversible chemical reactions. (burning of a chemical substance). After knowing all about these properties, the most fundamental difference is that the physical properties can be measured without any chemical change in them. But a chemical property is measurable when the substance goes through a chemical reaction.

Explanation:

Answer:

Birds can sit on power lines and not get electric shocks because the electricity is always looking for a way to get to the ground. The birds are not touching the ground or anything in contact with the ground, so the electricity will stay in the power line.

Pls mark as brainliest answer if it helps you

Answer:

For drinking.

For cleaning dishes.

For cooking.

for watering plants.

for washing clothes.

for bathing.

for generation of hydroelectricity.

for washing car.

making our dog bath

it helps in maintaining osmotic rate in humans

Explanation:

Hope this helps u

Crown me as brainliest

Answer:

drinking,washing clothes ,washing dishes ,cooking,watering plants,cleaning ,for generation of hydroelectricity,washing vehicles,aquatic life,bathing

Explanation:

follow me pls.

Answer:

Option B. 176g/mol

Explanation:

We'll begin by writing the chemical formula for hexasodium difluoride. This is given below:

Hexasodium means 6 sodium atom

Difluoride means 2 fluorine atom.

Therefore, the formula for hexasodium difluoride is Na6F2.

The relative formula mass of a compound is obtained by simply adding the atomic masses of the elements present in the compound.

Thus, the relative formula mass of hexasodium difluoride, Na6F2 can be obtained as follow:

Molar mass of Na = 23g/mol

Molar mass of F = 19g/mol

Relative formula mass Na6F2 = (23x6) + (19x2)

= 138 + 38

= 176g/mol

Therefore, the relative formula mass of hexasodium difluoride, Na6F2 is 176g/mol

Answer:

B. 176 g/mol

Explanation:

chemistry ed tell

Answer:

100 kPa

Explanation:

This can be solved with one of the gases law. This law establishes that the pressure of the gas is directly proportional to its temperature: If we increase the temperature, the pressure will increase.

In this case, we decrease the temperature, so its pressure will be lower.

P₁ / T₁ = P₂ / T₂

We convert T° to Absolutes Values

27°C + 273 = 300 K

-173°C + 273 = 100 K

300 kPa / 300 K = P₂ / 100 K

(300 kPa / 300 K) . 100K = P₂

P₂ = 100 kPa

This is the Charles Gay Lussac's law.

Answer:

The answer is C. Convection.

C Covention hope it help

Water can exist in all three states—solid, liquid, and gas—under specific temperature and pressure conditions on Earth. These conditions are commonly found at the Earth's surface.

At temperatures below 0°C (32°F) and normal atmospheric pressure, water freezes and forms solid ice. In this state, water molecules are tightly packed in a crystalline structure.

At temperatures between 0°C and 100°C (32°F to 212°F) and normal atmospheric pressure, water exists as a liquid. In this state, water molecules have enough energy to move and flow freely.

At temperatures above 100°C (212°F) and normal atmospheric pressure, water vaporizes and becomes a gas. This process is known as boiling. In the gaseous state, water molecules have high energy and are widely dispersed.

These temperature and pressure conditions allow for the presence of liquid water in oceans, rivers, and lakes, solid water in the form of ice caps and glaciers, and gaseous water in the atmosphere as water vapor.

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Answer:

1 2/15

Explanation:

2/3 + 7/15 = 17/15 =1 2/15

For an ideal gas, each of the following unquestionably leads to an increase in the pressure of the gas, except Increasing the temperature, volume, and the number of moles of the gas.

An ideal gas is a theoretical gas composed of many randomly moving point particles that are not subject to interparticle interactions.[1] The ideal gas concept is useful because it obeys the ideal gas law, a simplified equation of state, and is amenable to analysis under statistical mechanics. The requirement of zero interaction can often be relaxed if, for example, the interaction is perfectly elastic or regarded as point-like collisions.

Under various conditions of temperature and pressure, many real gases behave qualitatively like an ideal gas where the gas molecules (or atoms for monatomic gas) play the role of the ideal particles. Many gases such as nitrogen, oxygen, hydrogen, noble gases, some heavier gases like carbon dioxide and mixtures such as air, can be treated as ideal gases within reasonable tolerances over a considerable parameter range around standard temperature and pressure.

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The volume of 6.25 × 10⁻⁴ molar ferroin solution needed to prepare   10 ml of 2.50 × 10 ⁻⁵ molar solution with deionized water is 0.4 ml.

Molarity is a term used to express the concentration of a solution. It is the ratio of number of moles of solute to the volume of solution in liters. The number of moles of the solute is thus the product of its molarity and volume in liters.

Let V1 and M1 be the volume and molarity of the stoke solution and V2 and M2 be the volume and molarity of the solution to be prepared from its. Then,

M1 V1 = M2 V2.

Given the molarity and volume of the solution to be prepared is  10 ml and 2.50 × 10 ⁻⁵ m respectively. The molarity of stoke solution is 6.25 × 10⁻⁴ molar. Thus, the volume of stoke solution needed to be added is calculated as follows:

volume = molarity of solution to be prepared × volume / molarity of stoke solution

            =  (2.50 × 10 ⁻⁵ m × 10 ml ) /6.25 × 10⁻⁴

            = 0.4 ml

Therefore, the volume of ferroin solution  needed to be added is 0.4 ml.

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The pH of 2 solutions, a 0.1M HCl solution and a 0.1M acetic acid solution. The pH of the HCl is lower and the [H30+] is higher is true. Therefore, option 3 is correct.

The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.

The pH scale, which previously stood for "potential of hydrogen," is used to describe how acidic or basic an aqueous solution is. The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.

Thus, option 3 is correct.

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Answer:

D. ammonia, because the other three are the only three strong bases in the world (we do not need to memorize base dissociation constant for the test, we just need to know the three strong bases)

Explanation:

q u i z l e t

The energy released by the electron-capture decay of \(27Co^{57}\) is approximately 7.53 x \(10^{16}\) MeV m²/s².

To calculate the energy released by electron capture decay, we need to determine the difference in mass between the parent nucleus (in this case, \(27Co^{57}\)) and the daughter nucleus (\(26Fe^{57}\)).

The mass difference can be converted into energy using Einstein's mass-energy equivalence principle (E = mc²), where E represents energy, m represents mass, and c represents the speed of light.

Given the masses:

\(27Co^{57}\): 56.936296 u

\(26Fe^{57}\): 56.935399 u

The mass difference can be calculated as follows:

Mass difference = Mass of parent nucleus - Mass of daughter nucleus

Mass difference = 56.936296 u - 56.935399 u

Mass difference = 0.000897 u

Now, we convert the mass difference to energy using the equation E = mc²:

Energy = (0.000897 u) × (c²)

The speed of light, c, is approximately 3.00 × 10⁸ m/s.

Energy = (0.000897 u) × (3.00 × \(10^8\) m/s)²

Energy = (0.000897 u) × (9.00 × \(10^{16}\)m²/s²)

Energy = 8.073 × \(10^{13}\) u m²/s²

Since the energy is typically expressed in electron volts (eV) in nuclear decay calculations, we need to convert the energy from atomic mass units (u) to electron volts (eV).

1 atomic mass unit (u) is approximately equal to 931.5 MeV/c².

Energy = 8.073 × \(10^{13\) u m²/s² × (931.5 MeV/c^2/u)

Energy = 7.53 ×\(10^{16\) MeV m²/s²

Therefore, the energy released by the electron-capture decay of \(27Co^{57}\) is approximately 7.53 × \(10^{16\) MeV m²/s².

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Answer:

In everyday life, changing the speed of a moving object will change its velocity. The other values, such as acceleration, momentum, and mass, will not be affected.

The change in energy if the electron drops to the ground state is -2.04x10-18 J.

Electrons will excite from one energy level to the other by absorption and  emission of energy.  When electrons relax to the ground state from an excited level, energy is emitted or released by them.

Excitation of electron is caused by the transition of electrons within the energy levels. There are more quantized energy levels within that the electrons are revolving.

Different vibrational, rotational and electronic levels of energy contains their sublevels also thus, electrons can transit from the lower level to higher level by absorbing energy.

Electrons in the ground state are stable but when they acquire sufficient energy they transits to higher energy levels of quantized units. But the life time of electrons in the excited state is low and they returns back to the ground level by emitting the energy in the form of light or heat.

Thus, when electrons drops to the ground state, there occurs emission of heat or light energy.

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The lowest possible melting point for engine coolant that is 29.7% ethylene glycol is -12.85° Celsius.

Depression in freezing or melting point can be given by using the formula:

\(T_{f} = i\) × \(K_{f}\) × \(m^{}\), where:

'i' is the vant hoff factor, '\(K_{f}\)' is the freezing point constant for water, and 'm' is the molality. as we know that, molality, m, can be given by the formula:

Molaltity = \(\frac{Mass-of -ethylene -glycol}{Molar-mass-of-ethylene-glycol * Mass-of-water-in-kg}\)

Mass of ethylene glycol = 30 % of 100 g solution:

\(\frac{29.7}{100}\) × \(100^{}\) = 29.7g, rounding it off to 30 g

Mass of water = 100 - 30 = 70 g= 0.070 kg (1000g = 1kg)

Given, \(K_{f}\), freezing point constant for water = 1.86° C/m

Thus, putting all these values in the above equation, we get:

\(T_{f}\) = 1 × 1.86 × 30/ 62g/mol × 0.070

= 12.85° C (freezing point of 29.7% of ethylene glycol)

Now, calculating the lowest possible melting point:

Δ\(T_{f}\) = \(T_{} - T_{f}\) = 0 - 12.85 = -12.85° C

[ freezing point for water is 0° C]

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