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Answer:

Flammable liquid is any liquid having a flashpoint at or below 199.4 °F (93 °C).

Explanation:

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Flashpoints for flammable liquids are at 100°F. Lower flash points allow for easier ignition of liquids. A liquid's flash point is the lowest temperature at which a concentrated enough layer of vapor accumulates on top of its surface to allow for ignition.

A liquid that is flammable has a flash point* below 37.8 ° C (100 ° F). A flammable liquid has a flash point that ranges from 37.8 to 93.3° C (100 to 200° F), which is above the standard working temperature. Flammable liquids emit a vapor that, at standard working temperatures, is easily ignitable.

The substance ignites more readily the lower the flash point. For instance, petrol is more flammable than ethylene glycol and has a flash point of about -40 degrees C (-40 °F).

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Answer:

D. Ruler

Explanation:

Use the formula to find the volume of a cuboid by measuring the length, width, and height and multiplying all of them by each other.

Answer:

The balanced chemical equation for the reaction between sodium chloride and ammonia bicarbonate is:

NaHCO3 + NH4Cl → NaCl + NH3 + CO2 + H2O

From the equation, we see that one mole of sodium chloride reacts with one mole of ammonia bicarbonate to produce one mole of sodium bicarbonate and one mole of ammonium chloride. The balanced equation for the decomposition of sodium bicarbonate to sodium carbonate is:

2NaHCO3 → Na2CO3 + H2O + CO2

From the equation, we see that two moles of sodium bicarbonate decompose to produce one mole of sodium carbonate.

We start by calculating the number of moles of sodium chloride in 15.0 tonnes:

Number of moles of NaCl = mass ÷ molar mass

Number of moles of NaCl = 15000 kg ÷ 58.44 g/mol

Number of moles of NaCl = 2.568 × 10^5 mol

From the balanced equation, we know that the same number of moles of sodium bicarbonate and ammonium chloride are produced. Therefore, the number of moles of sodium bicarbonate produced is also 2.568 × 10^5 mol.

Now, we need to convert the number of moles of sodium bicarbonate to the maximum mass of sodium carbonate that could be produced. Since two moles of sodium bicarbonate produce one mole of sodium carbonate, we can use the molar mass of sodium carbonate to calculate the mass:

Mass of Na2CO3 = number of moles of NaHCO3 ÷ 2 × molar mass of Na2CO3

Mass of Na2CO3 = (2.568 × 10^5 mol ÷ 2) × 105.99 g/mol

Mass of Na2CO3 = 1.358 × 10^7 g

Mass of Na2CO3 = 1.358 × 10^4 kg

Therefore, the maximum mass of sodium carbonate that could be obtained from 15.0 tonnes of sodium chloride is 1.358 × 10^4 kg, or 1.36 × 10^4 kg to three significant figures.

When lead(II) nitrate and sodium carbonate are mixed together, they undergo a double replacement reaction. The products of this reaction are lead(II) carbonate and sodium nitrate.

The chemical equation for this reaction can be represented as follows: Pb(NO3)2 + Na2CO3 → PbCO3 + 2NaNO3. In this reaction, the cations and anions of both compounds switch places with each other to form new products. Double replacement reactions are common in chemistry and involve the exchange of ions between two compounds. Understanding the products of these reactions can help in predicting the outcome of chemical reactions and their potential uses.
Lead (II) nitrate and sodium carbonate indeed undergo a double replacement reaction. In this reaction, the positive ions (lead and sodium) switch places with the negative ions (nitrate and carbonate) to form new compounds. The balanced chemical equation for this reaction is:

Pb(NO₃)₂ (aq) + Na₂CO₃ (aq) → PbCO₃ (s) + 2NaNO₃ (aq)

Lead (II) nitrate reacts with sodium carbonate to produce lead (II) carbonate, a solid precipitate, and sodium nitrate, which remains dissolved in the solution. This type of reaction is commonly used in chemistry to produce specific compounds or to remove impurities from a mixture.

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The calorimeter constant when 51.203g of water at 55.2c is added to a calorimeter containing 49.783g of water at 23.5c and for the system to equilibrate, the final temperature reached is 37.6c is  9.67J/gc.

Given mass of water (m1) = 51.203g

Temperature of water (T1) = 55.2c

mass of water (m2) = 49.783g

Temperature of water (T2) = 37.6c

the final temperature reached is = 37.6c

We know that specific heat (Q) = mCpΔT where m is mass Cp is latent heat and ΔT is change in temperature.

So Qwater = 51.203 x 4.184 x (23.5 - 55.2) = 6791.9J

Qcalo = 49.783 x Cp x (23.5 - 37.6) = 701.9 x Cp

Given that Qwater = Qcalo

6791.9J = 701.9 x Cp

Cp = 9.67J/gc

Hence the calorimeter constant is  9.67J/gc

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It is a type of of addition combination chemical  reaction where in bromine adds across the double bonds of butane whose chemical equation is C₄H₈ +Br₂\(\rightarrow\)C₄H₈Br₂.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

Explanation:

P = Physical Change

C = Chemical Change

water boiling                         P

a car rusting                           C

petrol burning                          C

beer fermenting                        C

ice cream melting                   P

wind blowing                               P

milk turning sour                             C

seawater evaporating                 P

sugar dissolving in tea                 P

food being digested                         C

bleach cleaning a dirty cloth                

Answer:

Chlorine I guess.

Explanation:

none

Answer:

all places 1 is the answer

Explanation:

please mark me as brainlest

Explanation:

When air is sucked out of a drinking straw, the air pressure inside if decreases and the atmospheric pressure outside

Answer:

The pressure of the liquid (blood) forces the liquid to move into the syringe when its plunger is withdrawn. When air is sucked out of a drinking straw, the air pressure inside if decreases and the atmospheric pressure outside forces the liquid to go inside the straw.

Salt suitable for sprinkling on food at meals.

Based on the graph and the information provided, it can be stated another solution took place as there is a change in the properties of the substance.

The word "transmittance" refers to the ratio or in this case the percentage of light that can pass through a substance of object. This concept implies that if the tranmittance is 100% is beceuse 100% of the light is passing through the sample and 0% is of the light is being absorbed by it. In the same way if the transmittance is 20% is because the solution has likely become more dense and 80% of the light is being absorbed.

Considering the transmittance is directly related to concentration and density if there is a big change in the transmittance such as this returning to 100% it is likely because there was a chemical reaction that changed the properties (density) or concentrion of the sample.

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Answer:the snaswer is combined

Explanation:you have to piutg it’s toggle did dcdhcd

When food is cooked at extremely high temperatures, a process called pyrolysis takes place that results in the production of toxins in scorched meat and fish.

For several common grain species, such as rice, wheat, maize, soybeans, and barley, chemical mutation-derived cultivars have been produced and commercially commercialized. TILLING trying to target induced local lesions IN genomes is a novel technique that combines conventional mutagenesis with high-throughput mutation detection.

Definition. A physicochemical substance that has the ability to cause DNA mutations is referred to as a mutagen. Mutagens include a wide range of chemicals, tobacco products, radioactive materials, x-rays, UV light, and other types of radiation.

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250 kJ of energy are removed from a 4.00 x 102 g sample of water at 60˚C. Will the sample of water completely freeze: Yes, because there is enough energy.

250 kJ of energy are removed from a 4.00 x 102 g sample of water at 60˚C. Will the sample of water completely freeze: Yes, because there is enough energy.

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Phosphorous is not a micronutrient due to its essential role in numerous cellular processes and its requirement in larger quantities by organisms.

Micronutrients are essential nutrients required by organisms in small quantities for proper growth, development, and overall health. These nutrients include vitamins and minerals. While all the options provided (zinc, copper, manganese, phosphorous) are important for various biological functions, phosphorous is not classified as a micronutrient. Phosphorous is actually classified as a macronutrient. It plays a crucial role in many biological processes, particularly in the formation of DNA, RNA, and ATP (adenosine triphosphate), which is the energy currency of cells. Phosphorous is also an essential component of phospholipids, which are major structural components of cell membranes. Unlike micronutrients, macronutrients are required in larger amounts by organisms. They include carbohydrates, proteins, and lipids, in addition to macro minerals such as phosphorous. These macronutrients provide energy and serve as building blocks for various tissues and molecules in the body.

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Answer:

The answer is D

Explanation:

One or more new substances formed.

Answer:

D.One or more new substances formed.

Explanation:

Solution :

Sir Isaac Newton was a great scientist. The discoveries of the Newton change the way we see the world. Newton gave us the fundamental principles through which the entire universe is governed.

Newtons 1st law of motion states that a body moves or stays in position until and unless an external force is applied to the body.

This is the law of nature.

An example which do not support this law can be a body having a huge mass and a small boy applies force to move it but is unable to move the body.

I would say because the respiratory system brings in the oxygen for the body and the circulatory system moves it throughout the body with the blood

Answer:

The respiratory system helps you breath meanwhile your circulatory system helps the oxygen circulate in your blood throughout your body.

Explanation:

It helps you do many tasks like running, sprinting, etc.

Explanation:

When adding sugar to water it became a syrupy solution. Here sugar acts as solute, the water acts as solvent and syrupy acts as solution. When adding sugar to water, the disaccharide of sucrose is converted into monosaccharides of glucose and fructose

Answer:

syrupy solution

Answer:

B

Explanation:

it is the energy stored in the chemical bonds of a substance

Answer:

B. The energy of position or composition

Explanation:

Potential energy is the energy possessed by an object or a body due to it's position in relation with other objects or bodies. It is a stored energy.

The statement that "an important observation that assisted in the elucidation of the secondary structure of DNA was that mole percent adenine was almost always the same as the mole percent of thymine" is true.

The observation that is known as Chargaff's Rule, named after the biochemist Erwin Chargaff who discovered the phenomenon of secondary structure of DNA. He observed that the mole percent of guanine was almost always the same as the mole percent of cytosine. This discovery was crucial in determining the double helix structure of DNA, as it suggested that adenine and thymine, and guanine and cytosine, were paired together in the DNA molecule.  Therefore, the statement is true and played an important role in the understanding of DNA's secondary structure.

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Answer:

The partial pressure of the game because it was not the first time that happened to me and I was just wondering if I could get a better idea of what I need to do to get this done and what I need to do to get this done and what I need to do to get this done and what I need to do to get this done and what I need to do to get this done and what I need to do to get this done and what I need to

: The partial pressures of all the gases present in air are added to determine the total pressure of air at sea level. At sea level, nitrogen, oxygen, and all other gases have corresponding partial pressures of 77.10 kPa, 21.23 kPa, and 3.01 kPa.

As a result, the partial pressures of all the gases present in air are added to get the total pressure of air at sea level. The following formula is used to determine the air pressure at sea level: Air pressure at sea level is equal to 77.10 kPa plus 21.23 kPa plus 3.01 kPa, or 101.34 kPa.

Consequently, the air's overall pressure at sea level is 101.34 kPa. This total pressure of air is also known as the atmospheric pressure or barometric pressure.

It is the tension.exerted by the force of the atmosphere's air. The weather and climate of a place are significantly influenced by the atmospheric pressure. It may also be used to determine the height of a rocket or an aeroplane. An aeroplane or rocket's height is determined using the atmospheric pressure since it drops as altitude rises.

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All the chemical equations of this question has been balanced for the  given observed reactions.

Equal numbers and types of each atom appear on both sides of balanced chemical equations. A balanced equation must have coefficients that are the simplest whole number ratio. Chemical reactions always conserve mass.

A. Ba(NO₃)₂+ Na₂CO₃ → BaCO₃ + 2NaNO₃

B. Ba₂⁺ + 2NO₃⁻ + 2Na⁺ +CO₃²⁻→ BaCO₃(s) +2Na⁺ +2NO³⁻

C. Net ionic equation-

   Ba²⁺(aq) + CO₃²⁻(aq)→ BaCO₃(s)

D. overall reaction-

   3Ba(NO₃)₂(aq) + 2Na₃PO₄→ Ba₃(PO₄)₂(s) + 6NaNO₃(aq)

E. Ionic equation-

   Ba(NO₃)₂(aq) + 2NaCl(aq)→ BaCl₂(aq) + 2NaNO₃(aq)

  ∴ No reaction

F- Ba(NO₃)₂(aq) + 2NaOH(aq) → Ba(OH)₂(aq) +2NaNO₃(aq)

 ∴No net ionic equation.

Thus, all equations are balanced above.

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Answer:

There is 13 atoms in total.

Explanation:

There is 2 potassiums, 4 borons and 7 oxygens.

So 2 + 4 + 7 = 13 atoms

Hope this helps!

Answer:

B (40º c)

Explanation:

Rubidium being silvery-white and melting at 39 ºC. Which means 40º C is the closest.

Due to the presence or absence of reactants and/or products that escape or enter the system throughout the reaction, the mass of magnesium oxide produced in an open system and a closed system may differ.

Due to the oxygen from the air combining with the magnesium to form magnesium oxide, or MgO, the mass has increased.

This is so because the atoms from the reactants were used to form the new substances. To create the products, the atoms from the reactants dissociate, rearrange, and re-bond in a new configuration.

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The  proper collection and preservation of glass evidence for laboratory examination is crucial to make sure that no contamination or damage occurs to the evidence while it is being collected or transported.

Collecting the glass evidence: Carefully pick up the glass shards one at a time, using forceps or gloved hands, and place them into clean, sterile containers, such as paper bags or envelopes. Carefully label the container and include details such as the location and date of collection, the name of the person collecting it, and any other pertinent information.

Preservation of the glass evidence: After collection, the evidence must be protected from damage, contamination, or any other interference. For glass evidence, the following steps should be followed:Each container should be sealed with evidence tape and stored in a clean, dry, and temperature-controlled environment until it can be transported to the laboratory.

If the glass evidence is suspected of containing DNA or other biological material, it should be kept refrigerated. Any notes, photographs, sketches, or other documentation should be stored with the evidence.

Chain of custody: It is important to maintain a strict chain of custody for all evidence, including glass evidence. This means that every person who handles the evidence must be recorded, and there must be a clear record of its location at all times. This is important to ensure that the evidence is not tampered with, lost, or damaged in any way.

 This will allow the evidence to be used in court, and ensure that the suspect is properly prosecuted for the crime committed.

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