how many grams of KNO3 that should be placed in the airbag to fully react with the Na.
10 Na + 2KNO: > 1K20 + 5Naz0 + 1 N2 (g)

Answer:

A. 28 years

Explanation:

Applying,

R = R'(2ᵃ/ⁿ).............. Equation 1

Where R = Original sample, R' = Sample left after decay, a = Total time taken to decay, n = half life.

From the question,

Given: R = 12 g, R' = 6 g, a = 28 years.

Substitute into equation 1 and solve for n

12 = 6(2²⁸/ⁿ)

12/6 = 2²⁸/ⁿ

2²⁸/ⁿ = 2

Equation the base,

28/n = 1

n = 28 years.

Hence the half-life is 28 years

Answer:

This is what I put, it hasn't been graded though...

Within the system, the energy is flowing from your hand to the ice cream cone. Energy is also flowing from the surroundings to the ice cream cone unless it's reeeeaally cold in the surroundings in which case why are you even holding an ice cream cone when it's that cold?

As with any laboratory work, adequate facility design, operation, and monitoring, as well as excellent work practices, are necessary to protect laboratory staff against the hazard.

Both degrees of protection are based on the principle of ALARA (as little as reasonably possible) exposure. Electricity Risks By adopting adequate measures, the electrocution dangers of electrically powered instruments, tools, and other equipment are nearly completely minimized, therefore their use in the hazard need not represent a serious risk. You need the correct sort of scales if you want to weigh laboratory samples accurately. To accurately weigh the lab samples, for instance, you may use an analytical balance. The reliability of the weighing device will determine how accurate and precise the findings are.

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Answer:

OH^-

Explanation:

Any substance that is able to neutralize acidity in the stomach is generally known as an antacid. There are various kinds of antacids that are in common use. It should be noted that the stomach is usually slightly acidic.

Milk of magnesia is the substance magnesium hydroxide with chemical formula Mg(OH)2. A solution of milk of magnesia contains Mg^2+ and OH^-.

Hence the negative ion contained in milk of magnesia is the hydroxide ion  OH^-.

Answer:

B.  Mg3N2

Explanation:

There are 20.0 grams total material (14.4g Mg and 5.6 g N).  We can convert grams into moles of each element by dividing by that element's molar mass (g/mole) to yield the number of moles of each element.  To find the empirical formula, we need to convert the moles of each to a whole number by using a fracor that provides a whole number for each element.  5 works well, and we get 0.6x5 = 3 Mg atoms and 0.4x5 = 2 N atoms.

Mass % g/mole grams moles       Factor of 5

Mg 72.00% 24.305 14.4         0.6             2.962 or 3

N 28.00% 14.007 5.6         0.4             1.999  or 2  

100.0%          20          1.0      

There are 3 Mg and 2 N atoms per molecule.  The empirical formula is Mg3N2.

When a water molecule is split, part of it is which used to make fuels is : a.) the electrons and protons from the hydrogen.

The water molecules break down into hydrogen and oxygen at the atomic level during thermolysis. For instance, around 3% of all H2O dissociates into different combinations of hydrogen and oxygen atoms at 2200 °C, primarily into H, H2, O, O2, and OH.

Water splitting is the chemical reaction where water is broken down into oxygen and hydrogen: 2 H2O → 2 H2 + O2

Efficient and economical water splitting could be a technological breakthrough that could underpin hydrogen economy, based on green hydrogen. A version of water splitting occurs in photosynthesis also but hydrogen is not produced.

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The quantity of matter in a body,object,or substance is B. Mass.

A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely believed to be related to the amount of matter in a physical body.

It is the most fundamental characteristic of matter and one of the fundamental quantities in physics. Mass is a term used to describe how much matter is present in a body. The kilogram is the SI unit of mass (kg). A body's mass does not alter at any point in time.

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Yes, carbohydrates are used for energy storage to build structures, and as signal molecules to help cells communicate with each other.

Carbohydrates are molecules that consist of carbon, hydrogen, and oxygen atoms and can be broken down by the body to provide energy. They are used to build the structural components of cells, such as the cell walls and membranes, and are also used as signal molecules between cells. As signal molecules, they can help cells communicate with each other and respond to changes in the environment.

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Answer:

Forming bonds requires energy

Explanation:

Creating a bond is bringing 2+ atoms into a more stable position.

In a car engine, energy in the fuel's chemical energy stores is transferred to useful kinetic energy stores.

Explanation:

Chemical energy is the form of energy held within the fuel. A car's engine operates by burning fuel. The fuel is burned, creating mechanical energy that moves the vehicle. The engine thus transforms chemical energy into mechanical energy.

By applying pressure to the pistons and exerting work on them, the internal combustion engine of a car transforms the potential chemical energy in gasoline and oxygen into thermal energy, which is then translated into mechanical energy that drives the vehicle (raising its kinetic energy).

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Answer:

Hydrological plant is a process in which plants needs water to complete the process to produce glucose in the presence of CO2 ,sunlight .plants needs water to survive .

The amount of energy used to heat the water from 0°C to 70°C is 8,786.4J.

The amount of energy used in heating a substance can be calculated using the following formula:

Q = mc∆T

Where;

According to this question, a student heated 30 milliliters of water from 0 degrees celsius to 70 degrees celsius.

Since 1mL of pure water equals 1 gram, then 30mL of water will equal 30grams of water.

Q = 30 × 4.184 × (70 - 0)

Q = 8,786.4J

Therefore, 8,786.4J is the energy used to heat the water sample.

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Explanation:

what is an atom?

An atom is a basic building block of matter.

What is true about the particles?

D. They stay in place and vibrate.

Answer:We want the enthalpy associated with the reaction.........

Explanation:

H

3

CCH

2

OH

(

l

)

+

Δ

→

H

3

CCH

2

OH

(

g

)

You have a mass of

50.0

⋅

g

EtOH

, that is assumed to be at

78.3

∘

C

, and the enthalpy of vaporization is calculated by the product:

Δ

H

∘

vaporization

=

50.0

⋅

g

46.07

⋅

g

⋅

m

o

l

−

1

×

38.6

⋅

k

J

⋅

m

o

l

−

1

=

Explanation:

Answer:

Explanation:

Mass the fluid, find its volume, and divide mass by volume. To mass the fluid, weigh it in a container, pour it out, weigh the empty container, and subtract the mass of the empty container from the full container. To find the volume of the fluid, you simply measure it very carefully in a graduated cylinder.

Answer:

Pb(s)------>Pb2+(aq)

Explanation:

If you look at the oxidation numbers Pb increases from 0 to +2 while Cu decreases from +2 to 0.Hence,Pb is the reducing agent and Cu2+ is the oxidizing agent.

Also, a thing to note is that the oxidation number of  any solid is always 0.

~Hope this helps:)

nitric acid (HNO3) is classified as a strong acid in water, which means that it dissociates completely in water to produce hydrogen ions (H+) and nitrate ions (NO3-).

This is in contrast to weak acids, which only partially dissociate in water. Strong acids have a very low pH (typically less than 1) and are highly corrosive, making them useful for many industrial applications such as making fertilizers, explosives, and dyes. However, they can also be dangerous and must be handled with care. A strong acid is an acid that fully dissociates or ionizes in water, meaning it releases all of its hydrogen ions (H+) into solution. This makes the acid highly acidic and gives it a low pH (typically less than 1). Some examples of strong acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3), and perchloric acid (HClO4). Strong acids are highly reactive and can cause chemical burns and other damage if not handled properly. \

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Answer:

From Newtonian Mechanics

Vf=Vo + at

Vf=Final velocity

Vo= Initial Velocity

a= acceleration

t=time taken

Making "a" the subject

a=Vf - Vo/(t)

a = 10,000–5,000/(60)

a=5,000/60

a=83.33ms-²

Give a succinct description of how the various alkene reactants were combined to create the same result. The most stable intermediate carbocation will arise as a result of an electrophilic proton addition in the reaction between HCl and both alkenes.

The observed product is produced in both cases by adding Cl- to the tertiary carbocation that is produced. By figuring out the physical properties of the reactants and products, negative entropy in chemical processes may also be calculated. Gas molecules are widely spaced apart and move randomly in all directions, which results in high entropy in gases. Being a liquid converting into a solid, water freezing into ice is an entropy-reducing process. Due to the molecules' reduced freedom of movement, a solid has less chaos. A negative entropy reaction occurs when hydrogen and oxygen combine to generate water.

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The specific heat capacity of the metal is 35.34 J/g/°C, if the specific heat capacity of the water is 4.18 J/g/°C.

Volume of water = 200 ml

Density of water = 1 gm/ml

So the mass of the water in coffee cup, m₁ = 200×1 = 200 gm

Initial temperature of water, T₁ = 22.1°C

Specific heat capacity of water, S₁ = 4.18 J/g/°C

Mass of the metal, m₂ = 5.1 gm

Initial temperature of the metal, T₂ = 48.6°C

Final combined temperature of both, T = 26.8°C

Let the specific heat capacity of the metal = S₂

Heat gain by the water = heat loss in the metal

S₁ × m₁ × (T-T₁) = S₂ × m₂ × (T₂-T)

4.18 × 200 × (26.8-22.1) = S₂ × 5.1 × (48.6-26.8)

3929.2 = S₂ × 111.18

S₂ = 3929.2/111.18

S₂ = 35.34 J/g/°C

So, the specific heat capacity of the metal is 35.34 J/g/°C.

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Answer:

The energy should be high.

Explanation:

Bonds do store energy and release it depending if it's endothermic or exothermic. The energy should be low because when a bond forms (endothermic) it releases heat, which helps form bonds. Having a high energy means the bond is absorbing energy, which helps break bonds (endothermic). How this helps!

1.High energy demands: Down's cells require a large amount of energy to function effectively. The process of creating and maintaining the cells requires significant energy inputs to power equipment, lighting, heating, and cooling systems.

2.Manufacturing processes: Many of the processes involved in creating and maintaining Down's cells are energy-intensive. This includes cell replication, gene manipulation, and tissue culture.

3.Complex equipment: The equipment required for Down's cell research and production is often complex and requires significant energy inputs to operate. This includes centrifuges, microscopes, and other specialized equipment used in the lab.

4.Climate control: Down's cells must be kept at specific temperatures and humidity levels to maintain their integrity. This requires the use of energy-intensive climate control systems to maintain optimal conditions.

5.Data storage and processing: With the growing amount of data generated by Down's cell research, large quantities of electricity are also needed to store and process the data.

6.Extensive research and development: Down's cells are a relatively new area of research, which means that large amounts of electricity are used to power experimentation and the testing of new techniques and methods.

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The volume of methane is 69.15L.

Heat (Q) of methane =Heat(Q) of water

                        Q = mcΔt

water mass = volume(V) × pressure(P)

                    1L×1kg/L=1kg

298 K to 373k = 25°C to 100 °C

c water = 75.2J/mol K =4.2 J/g °C = 4200 J/kg °C

Heat of water (Q) = 1×4200 (100 -25)

Heat of water (Q) = 315000J

∴ Heat of methane = Heat of water = 315000 J

                         = 315 KJ

n (mol) methane = ΔH/Q

                890.4/315 = 2.83

According to the ideal gas law,

PV = nRT

Where;

            P = Pressure

            V = Volume

             n = amount of substance

             R = ideal gas constant

              T = temperature

    Now,  

             V = nRT/P

            V = 2.83 × 0.082 ×298/1

             V = 0.23206 ×298/1

             V = 69.15L

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Explanation:

The lunar phase or Moon phase is the shape of the Moon's directly sunlit portion as viewed from Earth. The lunar phases gradually change over a synodic month as the Moon's orbital positions around Earth and Earth around the Sun shift.

Answer: A. It doubles

Explanation:

"A boy sits in a chair and the floor pushes the boy" is not an action-reaction pair according to Newton's third law of motion.

According to Newton's third law of motion, every action which occurs in nature has an equal as well as opposite reaction. If a particular object Z happens to exert a force on another object Y then the object Y will also exert an equal as well as opposite force on object Z.
For example, when an oar pushes the water, the water also pushes the oar; when a dog wags its tail, the tail also wags the dog and when a missile pushes gas out, the gas also pushes the missile forward. All these instances involve an action-reaction pair.

Hence, option d. "a boy sits in a chair, and the floor pushes the boy" is the correct option.

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Answer:

Once the sun comes up, the sunlight excites the cold air in the first foot or so above the ground (which can be 10 or more degrees colder), which causes it to move around and mix into the next several feet of air. That “mixing upward” drops the temperature of the air at thermometer level.

Explanation:

Answer:

the answer is oxygen and carbon dioxide