17. A cannonball made of iron has a volume of 115 cm^3. If iron has a density of 7.86 g/cm3,
what is the mass in grams of the cannonball?
O 14.6 g
0.01 kg
0.9 g
904 g

help i don't know the answer ​

The half-life of a radioactive isotope is the amount of time it takes for half of the atoms in a sample to decay.

A radioactive isotope is an unstable form of an element that emits radiation as it decays. It is produced when a neutron is added to the nucleus of an atom, making it unstable and prone to radioactive decay. Radioactive isotopes are used in a variety of medical, scientific and industrial applications. In medicine, they are used to diagnose and treat diseases, while in industry they are used to detect flaws in materials. In scientific research, they are used to measure age and composition of materials.

Therefore, the half-life of this isotope is 12.75 years, since it takes 5.4 percent of the atoms in a sample to decay per year. This means that if we start with a sample of 100 atoms, after 12.75 years, only 50 atoms would remain in the sample. After 25.5 years, only 25 atoms would remain, and so on. This can be calculated by taking the natural log of 2 and dividing it by the decay rate of the isotope, which in this case is 5.4%.

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Answer:

plz mark as brainliest

Explanation:

A saturated solution of sodium bicarbonate is reacted with hydrochloric acid to form carbon dioxide gas.

Answer:

Table salt forms as well as water and carbon dioxide

Explanation:

NaHCO3 (aq) + HCl (aq) --> NaCl (aq) + CO2 (g) + H2O (l)

Answer

a) Ba

b) Si

c) Zn

Explanation

The presence of unpaired electrons in an atom orbitals indicates paramagnetic properties. When no unpaired electron is observed in an atom orbitals, such an atom possesses diamagnetic properties.

Therefore, atoms in their ground states that are expected to be diamagnetic in the options are:

a) Ba

b) Si

c) Zn

Answer:

Electrolytes, particularly sodium, help the body maintain normal fluid levels in the fluid compartments because the amount of fluid a compartment contains depends on the amount (concentration) of electrolytes in it. If the electrolyte concentration is high, fluid moves into that compartment (a process called osmosis).

Explanation:

Answer:

Electrolytes are minerals in your body that have an electric charge. They are in your blood, urine, tissues, and other body fluids. Electrolytes are important because they help

Balance the amount of water in your body

Balance your body's acid/base (pH) level

Move nutrients into your cells

Move wastes out of your cells

Make sure that your nerves, muscles, the heart, and the brain work the way they should

Sodium, calcium, potassium, chloride, phosphate, and magnesium are all electrolytes. You get them from the foods you eat and the fluids you drink.

The levels of electrolytes in your body can become too low or too high. This can happen when the amount of water in your body changes. The amount of water that you take in should equal the amount you lose. If something upsets this balance, you may have too little water (dehydration) or too much water (overhydration). Some medicines, vomiting, diarrhea, sweating, and liver or kidney problems can all upset your water balance.

Treatment helps you to manage the imbalance. It also involves identifying and treating what caused the imbalance.

The element that we can be able to use for the experiment in place of potassium is sodium.

We know that the elements that can be found in the same group does react in the same way. Now we know that we have to look about among the options so that we would be able to know element that is in the same group as potassium.

Given that both sodium and potassium are members of group 1, we have to look out for the element that element thus we have to select sodium.

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Answer:

ijcQwertyjkllmnnbbvcxzssssdttyyjnnnvvcxyj

Answer:

53.7kPa

Explanation:

Given parameters:

Total pressure of the mixture  = 96.4kPa

partial pressure of hydrogen  = 13.4kPa

partial pressure of oxygen  = 29.3kPa

Unknown:

partial pressure of methane  = ?

Solution:

The total pressure of mixture is equal to the sum of their particles pressures;

   Partial pressure of methane  = 96.4kPa - (13.4kPa + 29.3kPa)

  Partial pressure of methane = 53.7kPa

Answer: 53.6

Explanation: I just took the test and got it right.

Answer: 22.5 percent of incoming solar radiation goes directly to the surface of the Earth and is absorbed.

Explanation: Transfer of radiation through a planet's atmosphere. A planet and its atmosphere, in our solar system, can radiate back to space only as much energy as it absorbs from incoming solar radiation.

Answer:

Explanation:

I have the notes

"Only about 40 percent actually reaches the surface of the earth"

"our atmosphere and clouds reflect bout 40 percent of incoming solar radiation back into outer space"

"The remaining 60 percent is responsible for warming the earth"

"About 20 percent of this radiation is absorbed directly by the atmosphere"

There are approximately 3.8 x \(10^{6}\) g of Sodium Chloride in 65 liters of the solution.

The number of grams of NaCl in 65 liters of a solution can be determined by using the concentration of the solution. Since the concentration of NaCl is not given, it's not possible to determine the exact number of grams of NaCl in 65 liters of the solution.

However, if we assume that the solution is an aqueous solution of NaCl, we can make an estimate using the density of water. The density of water is approximately 1 g/mL, so 65 liters of water is approximately 65 × 1000 = 65000 mL of water. This means that if the concentration of NaCl in the solution is 1 M, then there would be 65000 mL × 1 M = 65000 moles of NaCl in the solution. Since the molar mass of NaCl is 58.44 g/mole, this would correspond to 65000 moles x 58.44 g/mole = 3.80 × \(10^6\) g of NaCl.

This is a rough estimate, and the actual number of grams of NaCl in 65 liters of solution would depend on the actual concentration of NaCl in the solution. However, if we use 2 significant figures, we can estimate that there are approximately 3.8 × \(10^6\) g of NaCl in 65 liters of the solution.

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Answer:

144 boxes, 72,000 washers

Explanation:

I'm not sure if this is right but convert the 18kg to g and then divide it by the grams. You get 144 and then multiply it by 500 for the total number of washers

Answer:

Thermal Transfer.

Explanation:

If you touch a hot object, the heat is transferred from the object to your hand through conduction. (This is the actual answer.)

Explanation:

Atomic size gradually decreases from left to right across the periodic table because within a period of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged. The effect of increasing proton number is greater than that of the increasing electron number. Therefore, there is a stronger nuclear attraction. This means that the nucleus attracts the electrons more strongly, pulling the atom's electron shells closer to the nucleus. As a result, the atomic diameter of the atom decreases.

Heree some the properties of salts:

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Answer: True

Explanation:

Mendeleevs periodic classification is based on the atomic masses of the elements.

Answer: all of the above

Explanation: All the choices listed above can be used to describe liquid

Answer:

{CH4 +2O2 ->CO2 + 2H2O}}}

Answer:

CH4 + 202----->CO2 + 2H2O

Answer:

2

Explanation:

Step 1

The reaction:

CaCO3 + heat => CaO + CO2 (completed and balanced)

-----------------------

Step 2

Information provided:

Actual yield = 0.53

Answer: Light waves are correct, sounds waves are not.

Explanation: Sound waves are close to light waves however they are closer together, hope this helped :)

Seems about correct to me.

When an unknown amine reacts with an unknown acid chloride, an amide with a molecular mass of 163 g/mol is formed. In the infrared spectrum, important absorptions appear at 1661, 750, and 690 cm.

To determine the structure of the amide, follow these steps:

1. Look at the infrared (IR) spectrum absorptions:
  - 1661 cm: Indicates the presence of a carbonyl (C=O) group, which is common in amides.
  - 750 and 690 cm: Suggest the presence of an aromatic ring.

2. Determine the molecular formula:
  - Using the molecular mass of 163 g/mol, we can use the information from the IR spectrum (amide and aromatic ring) to deduce the molecular formula. One possible formula that fits this information is C9H11NO (M = 163 g/mol).

3. Propose a structure:
  - Based on the molecular formula (C9H11NO) and the functional groups identified in the IR spectrum (amide and aromatic ring), we can propose a structure for the amide. The aromatic ring could be a benzene ring, and the amide group could be attached to one of its carbons. An example of such a structure is N-phenylethanamide.

Remember, there may be other possible structures that fit the given information, but this is a reasonable starting point for further analysis.

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Among the given polymers, polycarbonate would be suitable for the fabrication of cups to contain hot coffee.

Polycarbonate is a thermoplastic polymer known for its excellent heat resistance and durability. It has a high glass transition temperature and can withstand high temperatures without melting or deforming. This makes it suitable for holding hot beverages such as coffee without compromising its structural integrity.On the other hand, polyethylene, polypropylene, poly(vinyl chloride) (PVC), and PET polyester have lower heat resistance compared to polycarbonate. These polymers may soften or deform at higher temperatures, which can be a concern when handling hot liquids like coffee.Therefore, polycarbonate stands out as a suitable choice due to its superior heat resistance, making it well-suited for the fabrication of cups to contain hot coffee.

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Answer:

Here boron-11 means the name of the element is boron and the mass number is 11

Explanation:

No atoms are lost or made during the chemical reaction so the total mass of the products is equal to the total mass of the reactants. In an atom, protons and neutrons contribute to the mass and since the number of them doesn’t change, the mass doesn’t either.

The electronic configuration in an excited state of Galium is [Ar]3d104s14p2.

The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also known as electronic structure and electron configuration. The number of electrons within each orbital is denoted by a superscript, and the occupied

Orbitals are listed in order of filling to represent the electronic configuration for an atom according to the quantum-mechanical model. The electrical configuration of sodium in this notation would correspond to 1s22s22p63s1, distributed as 2-8-1. The electronic configuration in an excited state of Galium is [Ar]3d104s14p2.

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The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:

Photosynthesis occurs in two stages. During the first stage, the energy from sunlight is absorbed by the chloroplast. Water is used, and oxygen is produced during this part of the process.

Explanation:

Answer:

Chloroplast absorbs the energy emitted by the Sun.

_____________________________________________________

Context:

Photosynthesis:

The complex process by which carbon dioxide, water, and certain inorganic salts are converted into carbohydrates by green plants, algae, and certain bacteria, using energy from the sun and chlorophyll.

Chloroplast:

A plastid containing chlorophyll.

Chlorophyll:

The green coloring matter of leaves and plants, essentially to the production of carbohydrates by photosynthesis, and occurring in a blush-black form, C55J72MgN4O5 (chlorophyll a), and a dark-green form, C55H70MgtN4O6 (chlorophyll b).

Sun:

The star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat: its mean distance form earth is about 93 million miles (150 million km), its diameter about 864,000 miles (1.4 million km), and it's mass about 330,000 times that of earth; its period of surface rotation is about 26 days at its equator but longer at higher latitudes.

Explanation:

There are two main phases in photosynthesis:

depending on light stage

Clause Cycle (AKA the dark stage or the light-independent stage)

In the light-dependent stage, ATP and NADPH are produced using photons, or light energy. Oxygen molecules start to form during this stage as a byproduct.

Utilizing the materials produced during the light-dependent stage, the Calvin cycle fixes CO2 molecules to produce carbohydrates (sugars). This stage can repeat itself indefinitely since RuBP, the initial chemical required for the stage to go further, also serves as its byproduct.

The pH at the equivalence point for the titration of 20.00 mL of 0.0250 M formic acid with standard 0.0250 M NaOH is 3.74.

The balanced chemical equation for the reaction is:

HCOOH + NaOH → H₂O + NaHCOO⁻

Firstly, let's calculate the number of moles of formic acid in 20.00 mL of 0.0250 M formic acid.

Number of moles = concentration × volume

Number of moles = 0.0250 M × 20.00 × 10⁻³ L

Number of moles = 5.00 × 10⁻⁴ mol

The balanced chemical equation for the reaction between formic acid and NaOH tells us that one mole of formic acid reacts with one mole of NaOH to form one mole of NaHCOO⁻.

Therefore, the number of moles of NaOH required for complete neutralization of 5.00 × 10⁻⁴ mol of formic acid is also 5.00 × 10⁻⁴ mol.

As the concentration of NaOH is also 0.0250 M, the volume of NaOH required for complete neutralization can be calculated as follows;

Number of moles = concentration × volume

Volume = number of moles / concentration

Volume = (5.00 × 10⁻⁴ mol) / (0.0250 M)

Volume = 0.0200 L or 20.00 mL

So, the volume of NaOH required for complete neutralization is 20.00 mL.

The pH at the equivalence point can be calculated using the following formula;

pH = pKa + log [salt]/[acid]

Here, the salt is sodium formate (NaHCOO⁻) and the acid is formic acid (HCOOH).

At the equivalence point, the number of moles of HCOOH = number of moles of NaHCOO⁻ . Therefore, the concentration of HCOOH and NaHCOO⁻ would be the same.

Concentration of HCOOH = Number of moles / Volume = 0.0250 M

Concentration of NaHCOO- = Number of moles / Volume = 0.0250 M

Therefore, the ratio of [salt] / [acid] = 1.

Substituting the values into the formula;

pH = pKa + log [salt]/[acid]

pH = 3.74 + log 1

pH = 3.74

Therefore, the pH at the equivalence point for the titration of 20.00 mL of 0.0250 M formic acid with standard 0.0250 M NaOH is 3.74.

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The preparation of nitriles from alkyl halides are:

When alkyl halides react with NaCN (sodium cyanide) in the presence of a strong base, such as sodium hydroxide (NaOH), they undergo nucleophilic substitution (SN₂) to form nitriles. In the SN₂ mechanism, the nucleophile (CN⁻) attacks the alkyl halide, displacing the halogen atom and forming a new carbon-nitrogen bond.

NaCN is commonly used in this reaction because it provides the cyanide ion (CN⁻) as the nucleophile. The nucleophilic cyanide ion is attracted to the electrophilic carbon in the alkyl halide, facilitating the substitution reaction.

Methyl and primary alkyl halides are the most reactive substrates for this reaction. Due to their relatively unhindered nature, they allow for easier access of the nucleophile, resulting in higher yields of the desired nitrile product. Options A, D and E are correct.

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