When looking at the broken pieces of charcoal with a hand lens, you will see small pieces of black matter with a rough texture.
What is charcoal?Charcoal is a combustible, black solid fuel made from partially burned wood, bone, or other organic matter. It is primarily used as a fuel for barbecues, grills, and other cooking methods, and is also used in art and blacksmithing. Charcoal is created by burning wood or other organic material in a limited amount of oxygen, reducing it to a carbon-rich substance. The material is then heated to high temperatures to burn off volatile compounds, leaving behind a black, porous material that is rich in carbon. Charcoal is more efficient than wood as a fuel source because it has a higher energy content and produces fewer pollutants.
The pieces of charcoal are made up of small grains of carbon that were formed when the wood was burned. The texture of the charcoal varies from coarse to fine, depending on the type of wood used in the burning process.
When compared to a piece of coal, the charcoal pieces are much smaller and the texture is more rough. Coal forms when plant materials are buried beneath layers of sediment, which prevents oxygen from reaching them. Over a period of millions of years, these plant materials slowly convert to a charcoal-like material called coal. The coal has a much smoother texture than the charcoal and is made up of larger, more compact pieces of carbon.
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When red, green, and blue light are combined in equal proportions the result is? Yellow light Green light Black light White light O Ultraviolet radiation
Answer: white light
Explanation:
because complementary colors... but dont expect the same thing to work with paint. obviously
Which of these is a renewable resource found in Nevada?
A.
gravel deposits
B.
petroleum products
C.
zinc metal
D.
geothermal energy
Answer:
D.geothermal energy
Explanation:
The State of Nevada has abundant solar, wind, and biomass energy sources, but has more potential for geothermal energy production than any other state.
HELP!!! >_<
Instructions: Write and balance molecular equations for the following reactions between aqueous solutions. You will need to decide on the formulas and phases of the products in each of the cases.
Question: An aqueous solution of barium nitrate is mixed with an aqueous solution of potassium phosphate.
Balanced chemical equation:
[tex]3 Ba(NO3)2 (aq) + 2 K3PO4 (aq) ----- > 6 KNO3 (aq) + Ba3(PO4)2(s)[/tex]
What is double-displacement reaction?
In an aqueous solution, a double-displacement reaction takes place when the positive and negative ions of two ionic compounds exchange positions to form two completely different compounds.
Chemical formula for :
Barium nitrate---> Ba(NO3)2 (aq)
Pottasium Phosphate = K3PO4 (aq)
Reaction between these two is a type of double displacement type reaction in which ions are exchanged , forming
Pottasium Nitrate -----> KNO3 (aq)
Barium Phosphate -----> Ba3(PO4)2 (s)
(aq) means the phase is aqueous and (s) means phase is solid or the compound precipitated out .
Now, writing the molecular formula using the above data , we get:
[tex]Ba(NO3)2 (aq) + K3PO4 (aq) ------ > KNO3 (aq) + Ba3(PO4)2 (s)[/tex]
A equation is called balanced when number of chemical species are same on both sides of the equation .
Here, in product side there are 3 Ba and 2 (PO4) and only 1 Ba and 1 PO4 in reactant side to balance this let's multiply
2 with K3PO4 on reactant side and ,
3 with Ba(NO3)2 on reactant side
The equation thus becomes:
[tex]3 Ba(NO3)2 (aq) + 2 K3PO4 (aq) ------ > KNO3 (aq) + Ba3(PO4)2 (s)[/tex]
Now,
There are 6 K atoms on reactant side to balance this let's multiply 6 with KNO3 in product side by doing so we also balanced NO3.
Consequently, the balanced chemical equation is
3 Ba(NO3)2 (aq) + 2 K3PO4 (aq) ----- > 6 KNO3 (aq) + Ba3(PO4)2(s)
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How many protons, neutrons, and electrons does Iron (Fe) have if it has a +4 charge?
The number of protons, neutrons, and electrons that iron (Fe) have if it has a +4 charge are 26, 29 and 22 respectively.
How to calculate proton, electron and neutron numbers?Atomic number of an element is the number of protons in the atom of that element. The number of protons of a neutral atom i.e. charge 0 is equal to the number of electrons.
Iron is a metallic chemical element having atomic number 26 and symbol Fe. Since the atomic number is 26, the number of protons is 26.
If the charge of the iron is +4, this means that the number of protons will be 26 while the number of electrons will be 22. The number of protons will be 55 - 26 = 29.
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consider a sample of 1.0 mole of cl2 molecules and 1.0 mole of ca atoms. identify if each statement is true or false. both samples contain the same number of atoms both samples have the same mass in grams both samples contain 6.022 x 1023 atoms both samples contain 6.022 x 1023 particles (molecules or atoms) the sample of 1.0 mole of cl2 weighs more than the sample of 1.0 mole of ca true
The statement "Both the samples contain same number of atoms" is False.
The statement "both samples have the same mass in grams" is False.
The statement "both samples contain 6.022 x 1023 atoms " is False.
The statement "both samples contain 6.022 x 1023 particles (molecules or atoms)" is True.
The statement "the sample of 1.0 mole of cl2 weighs more than the sample of 1.0 mole of Ca" is True.
The number of atoms in both the case are :
Ca : 1 mole : 6.022 * 10^23 atoms
Cl2 : 1 mole : 2 * 6.022 * 10^23 atoms : 12.044 * 10^23 atoms
Weight of 1 mole of Cl2 : 70 g
Weight of 1 mole of Ca : 40 g
These Values are enough to justify the above True/False Statements.
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Very small changes in the solute concentrations in the various fluid compartments cause water to move from one compartment to another, which alters blood composition and blood pressure. How do the following physiological changes affect blood pressure?.
a. Decrease water reabsorption : decrease blood pressure.
b. Decrease peripheral resistance : decrease blood pressure
c. Vasodilation : decrease blood pressure
d. Decrease salt intake : decrease blood pressure
e. Decrease blood volume : decrease blood pressure
f. Vasoconstriction : increase blood pressure
g. Increase peripheral resistance: increase blood pressure
h. Increase salt intake: increase blood pressure
i. Increase blood volume : increase blood pressure
j. Increase water reabsorption: increase blood pressure
Total peripheral resistance: This phrase describes the obstruction to blood flow that the vascular system presents. The contact between the blood and the vessel's walls causes this resistance. It is, in other words, the vessels' resistance to blood flow. The sum of all the gruesome circuit resistances in the body is the total peripheral resistance. Total peripheral resistance rises as a result of mechanisms that cause vasoconstriction, while total peripheral resistance falls as a result of mechanisms that cause vasodilation.
Blood pressure:
This phrase describes the force that the blood exerts when it flows against the vessel walls. The volume and strength of the blasted blood as well as the vessel's size and suppleness all affect this pressure. Continuous blood pressure variations are caused by factors such as activity, temperature, nutrition, and emotional state.
Complete question:
Very small changes in the solute concentrations in the various fluid compartments cause water to move from one compartment to another, which alters blood composition and blood pressure. How do the following physiological changes affect blood pressure?
a. Decrease water reabsorption
b. Decrease peripheral resistance
c. Vasodilation
d. Decrease salt intake
e. Decrease blood volume
f. Vasoconstriction
g. Increase peripheral resistance
h. Increase salt intake
i. Increase blood volume
j. Increase water reabsorption
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gel electrophoresis separates molecules according to all of the following except question 1 options: a) color b) charge c) size d) shape\
Gel -electrophoresis is used to separate mixture of proteins, and other organic compounds based on their charge, size or shape but not by color.
What is gel electrophoresis?Gel electrophoresis is used to separate combinations of DNA, RNA, or proteins based on their molecular sizes. In gel electrophoresis, the molecules that need to be separated are forced through a gel that has tiny pores by an electrical field.
The speed at which the molecules move through the pores in the gel is inversely proportional to their size. This indicates that a smaller molecule will move through the gel further than a larger the molecule.
However, gel electrophoresis does not involve a separation based on the color of the compounds. Thus, option a is correct.
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How many Calories are in a
candy bar containing 919,600 J
of energy?
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, 2,19,789.6calorie are in a candy bar containing 919,600 J of energy.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
1 calorie= 4.184Joule
1 joule = (1/ 4.184)calorie
919,600 J will have energy
919,600× (1/ 4.184)
=919,600/4.184
=2,19,789.6calorie
Therefore, 2,19,789.6calorie are in a candy bar containing 919,600 J of energy.
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Answer:219.8
Explanation:
model an atom as an electron in a rigid box of length 0.100 nm, roughly twice the bohr radius. what are the four lowest energy levels of the electron?
The least energetic electrons are those in energy level I, also known as energy level K.Higher level electrons have more energy as you move away from the nucleus, and this energy increase is fixed and discrete.
What are the four main levels of energy?Sharp, Principle, Diffuse, and F are the four you need to be aware of (fine or fundamental).So, s, p, d, & f.Only that many sublevels are contained in the Principal Energy Level (the number).
Where is the place with the least energy?A 1s sublevel, which has a single orbital, is always the sublevel with the lowest energy.In its ground state, the hydrogen atom's lone electron will be located in the 1s orbital.As we move on to atoms containing multiple electrons, those additional electrons are added to the subsequent lowest sublevel, such as 2s, 2p, 3s, and so forth.
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what is the percent yield if 200 g of a product is produced during a reaction that has the potential of producing 250 g?
The answer for the percentage yield is 80%.
What is percentage yield?
Recovery is the ratio of actual recovery to theoretical recovery. It is calculated by dividing the experimental yield by the theoretical yield and multiplying by 100%. If the actual and theoretical yields are equal, the yield rate is 100%. Yields are usually less than 100% because actual yields are often lower than theoretical. This may be due to incomplete or competing reactions and sample loss during recovery. Recoveries can exceed 100%. This means that more samples were recovered from the reaction than expected. This can occur when other reactions that form the product occur. Another potential source of error is overage caused by incomplete removal of moisture or other contaminants from the sample. Yield is always positive.
Therefore, The answer for the percentage yield is 80%.
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Carbon and oxygen combine to form carbon dioxide. What are the reactants, or what is the reactant, in this chemical reaction?.
Combination reaction of Carbon and Oxygen:
Carbon dioxide is created when carbon and oxygen react as follows:
C + O₂ → CO₂ (1)
The reactants, carbon (C) and oxygen (O), are on the left side of reaction (1) above. This process solely produces carbon dioxide (CO2) as a result of this reaction (on the right side of the reaction).
What is a Combination Reaction?A direct combination reaction is one in which two or more substances (reactants) combine to create a single substance. It is sometimes referred to as a synthesis reaction (product). These processes are described by equations of form X + Y →XY (A+B→ AB). A combination reaction occurs when two or more components combine to form a single compound. In other terms, a combination reaction is a chemical reaction that occurs when two or more atoms or compounds react to create a single component.
Reactants are on left side of the arrow (tail)
Products are on right side of arrow (head).
Combination reaction of Carbon and Oxygen:
Carbon dioxide is created when carbon and oxygen react as follows:
C + O₂ → CO₂ (1)
The reactants, carbon (C) and oxygen (O), are on the left side of reaction (1) above. This process solely produces carbon dioxide (CO2) as a result of this reaction (on the right side of the reaction).
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Predict the products (if any) that
will be formed by the reaction
below. If no reaction occurs, write
NR after the reaction arrow. Be
sure to include the proper phases
for all species within the reaction.
Al (s) + HCI (aq) >
The products formed by this reaction are aluminium chloride and hydrogen gas is liberated.
Why is it necessary to balance a chemical equation?
Lets take the example of combustion of methange gas:
CH4 + O2 -----> CO2+ H2O
You can see that on the reactant side (left side) of the equation, there is one carbon atom, four hydrogen atoms, and two oxygen atoms if you count the number of atoms (subscripts) of carbon, hydrogen, and oxygen on both sides of the equation.
One carbon atom, two hydrogen atoms, and three oxygen atoms can be found on the product side (right side). As a result, the equation is unbalanced and does not comply with the rule of conservation of mass.
In order to balance the equation, we must adjust the amounts of the reactants and products, as necessary, by inserting coefficients in front of the appropriate formula(s).
CH4 + 2O2 -----> CO2+ 2H2O
When aluminium is reacted with hydrochloric acid, it gives aqueous solution of aluminium chloride and liberation of hydrogen gas is seen.
2Al(s) + 6HCl(aq)--------> 2AlCl3 (aq)+ 3H2(g).
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judy tests a common household substance and finds that it has a ph of 7. what type of substance is in the scenario?
On the pH scale, the pH range for an acid is 0–7 and the pH range for a base is 7–14. pH 7 refers to a neutral solution. pH-7 pure water is a substance considered neutral.
Is hydrogen an ion of H+?This substance, which consists of a water molecule with a proton (H+) added, is an ion because it has a charge. It is known as the hydronium ion and has the formula H3O+. When an acid dissolves in water, the hydronium ion is always produced. Always interacting with the nearby water molecule to generate H3O+, the acid's H+.
What are the uses of H3O+?For the detection of trace gases in the air, chemical ionization using proton-transfer reactions with hydronium ions (H3O+) is frequently used.
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Select all that apply. The discoveries of niels bohr were: quantum energy emissions charge on the electron orbits of electrons static electricity.
Orbits of electrons, -quantum energy emissions and -relationship between outer shell and chemical properties.
What is electron?electron is a subatomic particle with a charge of sub-atomic electricity found in all atom and is the primary carrier of electricity in solid.
Neil Bohr was the first who explained that electrons moves around the nucleus in the separate orbits or shells in an atom. The properties of an element is determined by the number of electrons in outer shell. He also discovered that electrons can only be in a particular orbits of fixed energy and when electrons allowed to jump from one orbit to another, they absorbed or emitted electromagnetic radiation.
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Complete Question
Select all that apply. The discoveries of Niels Bohr were:
- orbits of electrons
-charge on the electron
- quantum energy emissions
- static electricity
- relationship between outer shell and chemical properties
how many grams of ch3ohch3oh must be added to water to prepare 225 ml of a solution that is 2.5 m ch3ohch3oh ?
18.0121 grams of CH₃OH must be added to water to prepare 225ml of a solution that is 2.5 m CH₃OH.
Molarity of the solution is defined as the number moles of the solute present in one liter of the solution. Molarity is calculated from the equation,
M = No. of moles of solute / Volume of the solution in terms of liter.
Volume of solution given is 225 ml. As molarity is expressed in moles per liter.
Volume of solution = 0.225 L
Calculate the mole of CH₃OH by the expression of molarity,
225ml × 2.5 mole/1000 ml = 0.562 moles of CH₃OH .
Now convert 0.175 moles by multiplying molar mass of the solution. So,
0.562 moles × 32.05g of CH₃OH /1mole CH₃OH = 18.0121 grams
The volume equals to 18.0121 grams of CH₃OH.
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If you are given two moles of a substance, which of the following would be correct?
You have the same number of particles as in 12 grams of carbon-12.
You have one-third the number of particles that are in 12 grams of carbon-12.
You have two times the number of particles that are in 12 grams of carbon-12.
You have one half the number of particles that are in 12 grams of carbong-12.
Answer:
C. You have two times the number of particles that are in 12 grams of carbon-12.
Explanation:
Avogadro's number, 6.022 ×10^23, equals the number of particles in 12 grams of carbon-12.
This mean 1 mole of a substance will equals to the number of particles that are in 12 grams of carbon-12.
Therefore, 2 moles of a substance will equals to two times the number of particles that are in 12 grams of carbon-12.
rank the following ionic compounds based on increasing lattice energy. mgo, cacl2, nacl, nabr
The highest lattice energy among the given compounds is for MgO. The increasing order of lattice energy for these compounds is NaBr <NaCl< CaCl₂ < MgO.
What is lattice energy?Lattice energy of a compound is the energy required to convert one mole of the compound into its constituent ions in gaseous states. Lattice energy increases with decrease in size and increase in charge.
Thus, compound containing smaller ions with higher charges are having greater lattice energy. Both Mg and oxygen are smaller in size and have charges of +2 and -2 respectively. Na and Ca are bigger than Mg.
Ca2+ is smaller and greater in charge than Na+. Among NaCl and NaBr, Cl is smaller compared to Br thus NaCl has higher lattice energy.
Therefore, the increasing order of lattice energy is NaBr <NaCl< CaCl₂ < MgO.
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Calculate the kinetic energy of the cart at the point shown below. It has a mass of 0.5 kg, is 2.0 m high, and is moving at a velocity of 1.5 m/s. Round your answer to the hundredths place (two the decimal places).
Answer:
this is ez 123
Explanation:
What are the values of δs for the water, the surroundings, and the universe for the evaporation of water from an open pan at 25°c?.
Answer: nose
Explanation:sorry
What happens to mass and energy in a closed system?
OA. Only mass can enter or exit a closed system.
B. Both energy and mass can enter or exit a closed system.
C. Neither energy nor mass can enter or exit a closed system.
OD. Only energy can enter or exit a closed system.
SUB
Both energy and mass can enter or exit a closed system. The correct option to this question is D.
A closed system is one that only allows the flow of energy; it forbids the exchange of matter. Example: Heat can transfer when a lid is closed on a pot of boiling water, but matter cannot.In thermodynamics, an isolated system is analogous to a closed system in classical mechanics. Closed systems are frequently employed to restrict the variables that may have an impact on the outcomes of a particular experiment or problem.In other words, an airtight container is an example of a closed system.Boiling soup in a saucepan with a closed lid is another illustration of a closed system air conditioner.For more information on closed system kindly visit to
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in double replacement reactions, why will two metals not combine with each other when products are formed?
A double replacement reaction occurs when pieces of two ionic compounds switch places to form two new compounds.
A double displacement reaction is one in which one reactant is partially replaced by another.
Following is a description of double displacement reactions:
AD = AB + BC + CD
The ions in two reactant ionic compounds are switched out for the same ions in two new product compounds during a double replacement process.
A double replacement reaction occurs when two reactants switch cations or anions to create two new products.
Other names for double replacement processes include metathesis reactions and double displacement reactions.
Precipitation, gas generation, and neutralization are examples of double replacement reactions.
So, A double replacement reaction happens when bits of two ionic compounds switch places to create two new compounds.
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a metal (fw 340.1 g/mol) crystallizes into a body-centered cubic unit cell and has a radius of 2.87 angstrom. what is the density of this metal in g/cm3?
It is discovered that an unidentified metal crystallizes in a body-centered cubic lattice and has a density of 7.8748 g/cm3. The unit cell's edge measures 0.28664 nm.
If iron crystallizes in a body-centered cubic unit cell with an edge length of 287 pm, what is its density?A body-centered cubic unit cell with an edge length of 287 pm forms during the crystallization of iron metal. 287 p m . Iron has a molar mass of 55.85 gmol (1.85 gmol) and a density of 7.86 gcm (3.86 g c m)
Consequently, the formula for obtaining 7.97 g of iodine is: = 789.4 g x 7.97 g / 761.4 of NI3 = 6291.518 / 761.4 of NI3 = 8.26 g of NI3 Hence Grams.
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What percent of the world's table salt comes from the ocean?
Answer:
3.5%Explanation:
About 3.5% of the weight of seawater is made up of dissolved salts because of the salinity, or salt concentration, of saltwater, which is 35 parts per thousand.
_________________
Hope this helps!
Have a great day!
Answer:
the Caribbean
Explanation:
look below for question
if a drop of carbonated water were placed on blue litmus paper, what would be the color of the litmus paper?
If a drop of carbonated water were placed on blue litmus paper, the color of the litmus paper will turn red.
Carbonated water is water that contains dissolved carbon dioxide gas, which may have been added to the water intentionally under pressure or may have occurred naturally as a result of geological processes. Carbonation creates tiny bubbles that make water effervescent. Club soda, sparkling natural water, and sparkling water created commercially are examples of soda water.
As soda water is an acidic solution, the blue litmus paper changes to a red color. This is because the carbonation process, in which CO₂ is bubbled into the water, results in the formation of carbonic acid, which then interacts with litmus paper.
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If a sample of air in a closed container was heated would the total pressure of the air in the container increase decrease or remain unchanged. Explain your reasoning.
According to the Gay-Lussac's law, as the container is heated that is as temperature increases pressure also increases as they are directly proportional to each other.
What is Gay-Lussac's law?Gay-Lussac's law is defined as a gas law which states that the pressure which is exerted by the gas directly varies with its temperature and at a constant volume.The law was proposed by Joseph Gay-Lussac in the year 1808.
The pressure of the gas at constant volume reduces constantly as it is cooled till it undergoes condensation .The nature of graph of pressure versus temperature is linear.
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The normal boiling point of Substance A is 129.4 °C. Given that the vapor pressure of Substance A is 481.9 torr at 8.5 °C, calculate the molar enthalpy of vaporization to the nearest kJ/mol
Problem #8: A 5.00 L flask contains 3.00 g of mercury. The system is at room temperature of 25.0 °C. By how many degrees should we increase the temperature of the flask to triple the mercury vapor pressure. The enthalpy of vaporization for mercury is 59.11 kJ/mol?
Solution:
1) Let us use the Clausius-Clapeyron Equation:
with the following values:
P1 = 1 T1 = 298 K
P2 = 3 T2 = x
3) Set up equation with values:
ln (3/1) = (59110 / 8.31447) (1/298 minus 1/x)
1.0968 = 7109.2926 (1/298 minus 1/x)
1.0968 = 23.8567 minus 7109.2926/x)
x = 312.4 K = 39.4 °C
the mineral energite is 48.41% cu, 19.02% as and 32.57% s by mazz. what is the emperical orumal of enargite
The above assertion claims that the emperical formula for enargite is Cu3AsS4.
Describe the empirical formula.The simple whole number proportion of atoms in a compound is the empirical formulae of a chemical in chemistry. No information on the arrangement or quantity of atoms is provided in an empirical formula.
Briefing :If we use 100 grams of enargite:
n(Cu) = 48,41 g ÷ 63.55 g/mol.
n(Cu) = 0.761 mol.
n(As) = 19.02 g ÷ 74.92 g/mol.
n(As) = 0.254 mol.
n(S) = 32.57 g ÷ 32.065 g/mol.
n(S) = 1.016 mol.
n(Cu) : n(As) : n(S) = 0.761 mol : 0.254 mol : 1.016 mol / 0.254.
n(Cu) : n(As) : n(S) = 3 mol : 1 mol : 4 mol.
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What is the most important reason for using hydrates in fire extinguishers?
-They keep fire extinguishers dry during shipping and storage.
-They make fire extinguishers more affordable for household use.
-They create foams that have high water content to help extinguish fires.
-They create high pressure in the cylinder to quickly force out the fire r*tardant.
The importance of the use of hydrates in fire extinguishers are;
-They keep fire extinguishers dry during shipping and storage.
-They create foams that have high water content to help extinguish fires.
They create high pressure in the cylinder to quickly force out the fire r*tardant.
What is a fire extinguisher?We know that a fire extinguisher has to do with any device that has been made in such a way that the device can be used to eliminate a flame that is burning. We all know that fore can be very destructive. This implies that it is important to be able to put out the fire so that it does not cause big problems.
The fire extinguisher is composed of certain chemical substances that are able to react together quickly and then be able to quench the flame of the reaction that is going on in the system.
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Which changes always happen during a fission reaction?(1 point)
What happens during a fission reaction is that matter is converted to energy.
What is fission?We define the term fission as the kind of reaction that involves the breaking of the nucleus of an atom and then there would be a release of energy. There are various kinds of nuclear reactions that we have but the most common types of nuclear reactions are the fission and the fusion reaction.
In the fusion reaction we have the combination of two or more lighter nucleus so as to produce a heavier nucleus while in the case of the fission reaction the nucleus would have to be broken up so that energy can be released in the process.
Thus, we see that the total mass on the left hand side may not be the same as the total mass on the left hand side because some of the mas is converted to energy.
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Missing parts;
Which change occurs during a nuclear fission reaction?
(1) Covalent bonds are converted to ionic bonds.
(2) Isotopes are converted to isomers.
(3) Temperature is converted to mass.
(4) Matter is converted to energy