Answers
We could use a large size sieve to separate large stones from pear sized gravel. Option A
What is a sieve?A sieve is a device that could be used for separation. When we are carrying out separation using a sieve, the separation is done according to the sizes of the materials. We know that the sieve allows a given size of the material to pass through while holding back the other sizes.
In this case, we can see a sieve that has been pictured in the question. The size of the sieve is what determines the kind of things that it could separate. As such, we could use a large size sieve to separate large stones from pear sized gravel. Option A
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Related Questions
determine whether each description describes fat-soluble or water-soluble vitamins. not all descriptors will be used.
Answers
Vitamins are one of the six classes of food.
What are vitamins?Vitamins are one of the six classes of food. Some of the vitamins could be dissolved in water while some can not be dissolved in water. The vitamins that could dissolve in water are called water soluble vitamins while the vitamins that could only dissolve in fat are called fat soluble vitamins.
Now let us classify the vitamins based on description;
Fat soluble vitamins;
Vitamins that travel with dietary fats through the bloodstream Vitamin that provide 2 kcals per gram Vitamins A, D, E.&KVitamins that are converted to fat in the liverVitamins that are mostly stored in the liver and fatty tissuesWater soluble vitamins;
Vitamins that could be easily lost during food preparationVitamins that include B and CVitamins that are easily excreted form the bodyLearn more about vitamins:https://brainly.com/question/1165711
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Write the number of significant figures
Answers
Answer:
52. 3
53. 2
54. 2
55. 5
Not sure what the line is on number 54, but I think the answer is 2.
Can someone PLEASE write a poem about the Female reproductive system with 10 stanzas
Answers
there are 393939 students in ms. salazar's chemistry class. if ms. salazar divides the class into 999 lab groups of 444 or 555 students each, what would be the number of lab groups with 555 students?
Answers
The total number of lab groups with 555 students is 447.
The total no. of students = 393939
Division of class into labs = 999
Let us consider there are two types of lab
No. of students in one type of lab = 444
No. of students in another type of lab = 555
Let the no. of labs which have 555 students = x
Then, remaining labs which contain 444 students can be calculated as
Total lab - x
= 999 - x
Calculation:Now, according to the question,
555( x) + 444 (999 - x) = 393939
555x + 443556 - 444x = 393939
-111x = - 49617
111x = 49617
x = 49617/ 111
x = 447
Thus, we calculated that the total number of lab groups with 555 students is 447.
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Why does an object such as a cannonball appear to fall toward Earth, rather
than Earth falling toward the cannonball?
A. The force of gravity acting on the cannonball is greater than the
force of gravity acting on Earth.
OB. Earth has a large radius, so the distance from the center of the
Earth to the cannonball is greater than the distance from the
cannonball to Earth.
C. The force of gravity acting on Earth is greater than the force of
gravity acting on the cannonball.
OD. Earth has a much greater mass than the cannonball, so the same
amount of force acting on Earth results in much less acceleration.
Answers
The force of gravity acting on Earth is greater than the force of gravity acting on the cannonball. Option C is correct.
This is because according to Newton's third law of motion, for every action there is an equal and opposite reaction. When the cannonball is released or fired, it experiences a force of gravity pulling it towards Earth. However, Earth also experiences an equal and opposite force of gravity pulling it towards the cannonball.
Since Earth has a much greater mass than the cannonball, the force of gravity acting on it is much stronger than the force acting on the cannonball. Therefore, the cannonball appears to fall towards Earth, while Earth remains relatively stationary. Option C is correct.
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why is direct nucleophilic substitution of an alkyl halide with nh3 not a very useful method for preparing primary amines?
Answers
This is so because extra 2° and 3° alkyl amine can be created by the nucleophilic action of the primary amine that is formed by ammonolysis.
Ammonia reacts as nucleophile with alkyl halides to give primary amines in neuclophilic substitution reaction. The primary amine produced can also interact with the alkyl halide to produce a disubstituted amine, which can then interact with another substance to produce a trisubstituted amine.Yield is often poor because primary amine R-NH2 itself is a nuclophile and can react with more alkyl halides. So the result or product obtained contain secondary, tertiary, quaternary ammonium salts. we can avoid this problem by using excess amount of ammonia in the reaction.Alkylation of ammonia results in a variety of compounds as a result. Therefore, it cannot be considered as very useful method for preparing Primary amines.
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Upon combustion, a 1.2743 g sample of a compound containing only carbon, hydrogen, and oxygen produces 3.2007 g CO2 and 0.9827 g H2O. Find the empirical formula of the compound.
Answers
The answer would be C8H12O2.
Here is the equation with masses :
1.2743 g CaHbOc + (3.2007 g + 0.9827 g - 1.2743 g) O2 ------> 0.9827 g H2O + 3.2007 g CO2
We are using 32.00 g/mol for O2
We are using 18.03 g/mol for H2O
We are using 44.01 g/mol for CO2
We don't know molecular mass of Hydrocarbon so we permit a,b and c to be any positive real number.
CaHbOc + 2.9091 g / 32.00 g/mol O2 ----> 0.9827 g/ 18.03 g/mol H2O + 3.2007 g/ 44.01 g/mol CO2
Now, calculate the above division
CaHbOc + (0.0909 mol) O2 -------> (0.0545 mol) H2O + (0.0727 mol) CO2
Matching coefficient we get
a = 0.0727
b = 2 * 0.0545 = 0.109
c = 0.0545 + 2*0.0727 - 2*0.0909
= 0.0181
Divide every number by 0.0181
a / 0.0181 = 0.0727/ 0.0181 = 4.01
b / 0.0181 = 0.109/0.0181 = 6.02
C / 0.0181 = 0.0181 / 0.0181 = 1
Multiply over number by 2
a = 4.01 * 2 = 8.02 ~ 8
b = 6.02 * 2 = 12.04 ~ 12
c = 1 * 2 = 2
Now putting these values we get C8H12O2.
The chemical name of the C8H12O2 is 2-Octynoic acid
Hence the empirical formula of the compound is C8H12O2.
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What would the mystery charge labeled "?" have to be for this object to have a net electric charge of +3?
Answers
For the net charge to be +3,the mystery charge should be is -2 and net force is towards left.
In first problem, overall charge should be -2 (as mentioned in question).So charge labelled with ? should be negative charge ( -ve). There will be net force on -1 charge towards +3 charge (left). For box (b)net force towards right For box c) net force towards right.It is often referred to as electric charge, electrical charge, or electrostatic charge, and denoted by the letter q, is a property of a unit of matter that indicates how many more or less electrons than protons it has.When retained in an electric or magnetic field, matter's basic physical feature known as electric charge causes it to experience a force.To learn more about charge visit:
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Explain how animals affect the water cycle as the breathe
Answers
Animals contribute to the water cycle mainly through breathing perspiration and the excretion of waste. Animals release water vapor when they exhale which contributes to the water vapor in the atmosphere. Sweat is also released through the pores which then evaporates to help cool their body down. Water is also excreted through urination as well as in their solid waste.
The position of animals within the water cycle is they launch water vapor once they exhale. explanation The water cycle suggests the non-stop motion of water within the earth and ecosystem. Liquid water evaporates into water vapor, condenses to shape clouds, and precipitates lower back to earth as rain and snow. Excretion is an essential part of the water cycle because it contributes to the quantity of water vapor in the air.
Humans and most animals excrete water by sweating, urinating, or defecating. The water molecules in those wastes can also evaporate and be a part of the water vapor suspended within the environment. cellular breathing performs a position inside the water cycle because it makes molecules of water from glucose and oxygen. The hydrogen inside the water molecule comes to form the glucose molecule, C6H12O6, even as the oxygen inside the water molecule comes from the oxygen fuel atom.
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How many milligrams of sodium chloride are in a liter of solution that has 4.50 x 10-6 kg of sodium per liter?
Answers
The mass of sodium chloride that is present in a liter of solution that has 4.50 x 10⁻⁶ kg of sodium per liter is 45 mg.
What is the mass of sodium chloride in milligrams that is present in a liter of solution that has 4.50 x 10⁻⁶ kg of sodium per liter?The mass of sodium chloride in milligrams that is presents in a liter of solution that has 4.50 x 10⁻⁶ kg of sodium per liter is calculated as follows:
mass = mass concentration * volume in litersMass concentration of sodium chloride solution = 4.50 x 10⁻⁶ kg of sodium chloride per liter.
Volume of solution = 1 liter
Mass of sodium chloride = 4.50 x 10⁻⁶ kg/L * 1 L
mass of sodium chloride = 4.50 x 10⁻⁶ kg
mass of sodium chloride = 4.50 x 10⁻⁶ kg * 1000000 mg/kg
mass of sodium chloride = 45 mg
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Calculate density
Mass = 23.6 g
Volume = 30.0 cm³
Answers
Answer:
Determine the weight of an object. For example, a glass of water weights 200 grams net (not including the glass).
Find out the volume of an object. In our example, it's 200 cm3 .
Divide weight by volume. 200 g / 200 cm3 = 1 g/cm3
Optionally, change the unit.
Explanation:
washing soda is a hydrate of sodium carbonate. its formula is na2co3. x h2o. a 2.714 g sample of washing soda is heated until a constant mass of 1.006 g of na2co3 is reached. what is the value of x in the formula?
Answers
Washing soda is a hydrate of sodium carbonate. its formula is na2co3. x h2o. Here, the value of x in the formula is 10.
We are given that:
Mass of washing soda = 2.714g
Molar mass of Na2CO3 = 105.98 g/mol
The molar mass of washing soda = (105.98 + 18x) g/mol
Solution:
The chemical equation is given below:
Na2CO3.H2Ox -------> Na2CO3 + xH2O
1 mole of Na2CO3 produces 1 mole of sodium carbonate (Na2CO3) and x moles of water.
Now number of moles of Na2CO3 = (1.006 / 105.98) = 0.009492 moles
The number of moles of washing soda is equal to the number of moles of Sodium carbonate formed i.e. 0.009492 moles
Now
2.714 / 105.98 + 18x = 0.009294
x = 10.11
x = 10
The value of x in the formula is 10.
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GUYS PLEASE HELP. I HAVE THIS AS ONE OF MY TEST THING AND ITS FOR 100 POINTS. ILL COPY AND PASTE IT.
Question: Prior to an investigation on the human body, students predict how new cells are created. According to cell theory, which students prediction is correct
Responses
A. Humans are born with all the cells they will ever need. The cell grow and develop but are not replaced
B. New cells are created from nutrients in the food we eat, such as calcium
C. New cells are created from existing cells
D, New cells are created by the reproductive system to replace cells that wear out
Answers
Answer:
D, New cells are created by the reproductive system to replace cells that wear out
Explanation:
Because The cells are going through cell division from mitosis causing new cell to form
BEERS LAW - EASY - Use this method to calculate the molar concentration of "copper (II) sulfate" if it has a measured absorbance of 2.17. The absorbance of a 0.10 M solution is 0.96. Round your answer to correct significant figures and do not include units.
Answers
The molar concentration of copper (II) sulfate that has a measured absorbance of 2.17 is 0.23 M.
What is the concentration of the copper (II) sulfate" if it has a measured absorbance of 2.17?
The concentration of the copper (II) sulfate that has a measured absorbance of 2.17 is determined by the Lambert-Beer's law which is given below as follows:
A = ε * l * cwhere:
A = absorbance measured by the spectrometerε = molar absorptivity,l = path length of light through the cellc= concentration, in mol/L, of the sample solution being measuredSince the values of molar absorptivity and path length are constant, the Lambert-Beer's law can be expressed as follows:
A₁/C₁ = A₂/C₂
Where A₁ is absorption at concentration C₁
A₂ is absorption at concentration C₂
From the data provided:
A₁ = 0.96
C₁ = 0.10
A₂ = 2.17
C₂ = ?
C₂ = A₂ * C₁/A₁
C₂ = 2.17 * 0.1/0.96
C₂ = 0.23
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You have two pieces of jewelry. One of them is supposed to be pure silver. The first piece has a mass of
20.0 g and the other piece has a mass of 44.0 g. Both pieces displace 4.0 mL of water. Silver has a density
of 10.5 g/cm³. Which piece is actually silver?
Answers
The silver piece with mass of 44.0 g is an actual silver.
What is mass?A mass can be defined as a dimensionless quantity representing the amount of matter in a particle or object. The SI unit of mass is kg.
A density is defined as the measurement of how tightly a material is packed together.
To calculate the purity of silver first we have to calculate density of both the silver.
4.0 ml = 4.0 cm3
Density of 20.0 g silver = 20.0g/4.0 cm3 = 5.0 g/ cm3
Density of 44.0 g silver = 44.0g/4.0 cm3 = 11.0 g/ cm3
Thus, the density of 44.0 g of silver is near to density of pure silver hence, 44.0 g of silver is a pure silver.
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Why is the state of matter a physical property of matter?
Answers
Answer:
State of matter is not a chemical property of a substance,
Explanation:
This means that when an objects changes states of matter (such as from solid to liquid), a chemical change does not occur since the substance is the same. When an ice cube melts into water, it is still water. A chemical change only occurs when one substance turns into a different substance. State of matter only has to do with the amount of energy in the particles of a substance and their distance from each other.
to show the electron configuration for an atom, when would it be better to use an orbital notation than to use a written configuration with numbers, letters, and superscripts? when the aim is to use less space
Answers
The aim is to use less space while demonstrating the distribution of electrons in shells
If you want to depict how an atom's electrons are scattered across its subshells, an orbital notation is more suited.
This is due to the fact that some atoms have unique electronic configurations that are not readily apparent from textual configurations.
How does electron configuration work?
The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also known as electronic structure or electron configuration.
What sort of electron arrangement would that look like?For instance: You can see that oxygen contains 8 electrons on the periodic table. These 8 electrons would fill in the following order: 1s, 2s, and finally 2p, according to the aforementioned fill order. O 1s22s22p4 would be oxygen's electron configuration.learn more about electronic configuration here
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based on the strength of intermolecular forces present, arrange the following substances in order of increasing (lowest first) boiling point. explain how you arrived to that order. h2o, ch4, ch3ch3
Answers
Based on the intermolecular forces present. The increasing order of boiling point of the following compound is CH₃CH₃ < H₂O < CH₄.
What is the boiling point?The boiling point is the point or temperature at which the vapor pressure of a compound equals the vapor pressure of the atmosphere.
The boiling point of different compounds and substances is different. The boiling point of water is 100 °C, and the boiling point of CH₃CH₃ is -89 °C. The boiling point of CH₄ is 161.6 °C.
Thus, the increasing order of boiling point of the following compound is CH₃CH₃ < H₂O < CH₄.
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. How would you separate a mixture of wood powders, iron powders, aluminum powders, and salts?
Answers
Explanation:
For those who like to step beyond the challenge, the mass of the materials could be measured to check the methodology. Prior to separating the mixture, measure the mass of the total mixture. After separating and drying all the materials, measure the mass of each material. Add the three masses together. The total should equal the initial mass if all materials were recaptured during the separation process.
Iron particles will be drawn towards a magnet when one is used. In this manner, aluminum powder and iron powder can be separated. Due to the fact that iron is magnetic but the other three are not.
Magnets are used in magnetic separation, a waste management technique, to remove metal from the trash. As the materials are gathered together and segregated before processing, this is most frequently seen in single and mixed streams of recycling.
This method can be used to eliminate unwanted metals from products. All materials are kept pure by it. Recycling facilities frequently use magnetic separation to isolate metals, purify ores, and separate components from recycling.
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The head of a pin is approximately 1 mm in diameter. The diameter of an atom is on the order of 2.5 × 10^-10
meters. Calculate how many atoms it would take to line up across the head of a
pin. Show your work.
Answers
Answer:
Q: how many atom can fit on the head of a pin? About five million million hydrogen atoms could fit.
Explanation:
practice entering numbers that include a power of 10 by entering the diameter of a hydrogen atom in its ground state, dh
Answers
A hydrogen atom's diameter in its ground state is 1.06 x 10^-10 metres.
What makes up an atom of hydrogen?The hydrogen atom is the most basic of all the atoms because it only has one proton and one electron. There are two other hydrogen isotopes, deuterium and tritium, in addition to protium, which is the most prevalent form of the atom.The three known isotopes of hydrogen. The isotopes of hydrogen with mass numbers 1, 2, and 3What do you call two hydrogen atoms?Hydrogen gas molecules are composed of two hydrogen atoms bound together by a covalent bond. In other compounds, such as water with an oxygen atom and hydrocarbons with carbon atoms, hydrogen atoms also form covalent connections.learn more about hydrogen atom here
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the question you are looking for is
Practice entering numbers that include a power of 10 by entering the diameter of a hydrogen atom in its ground state, dh= 10.6x10^-11m, into the answer box.
If i titrated 2g of a NaHCo3+NaCo3 mixture with 1.0 Hcl how can I calculate for the percent composition of NaHCo3/NaCo3 in the mixture
Answers
The percentage composition of [tex]NaHCO_{3}[/tex] in the mixture on titration with mixture with 1.0 HCl is 26.5%
What is Titration ?
"The process of calculating the quantity of a substance A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalency is obtained (the equivalence point)" is the definition of titration.
However, redox titration and acid-base titration are the two most typical titration types used in quantitative chemical analysis.
Titration Methods:Titrations of acid and base.oxidative titrationsTitrations of precipitationTitrations using complex metrics[tex]NaHCO_{3}[/tex] + HCl → NaCl + [tex]H_{2} O[/tex] + [tex]CO_{2}[/tex]
( 23+1+12+48 ) (1+35.5)
=84 g =36.5g
HCl consumed when used with [tex]NaHCO_{3}[/tex]
[tex]\frac{36.5}{84}[/tex] x 0.63
= 0.2737 g
HCl in millimoles used with the mixture that is given by the equation;
= molarity x Volume in mL
[tex]\frac{1}{10}[/tex] x 150 =15
HCl weight consumed with the mixture is given by the equation;
= millimoles x mol.wt x [tex]10^{-3}[/tex]
= 15 x [tex]10^{-3}[/tex] x 36.5
= 0.5475g
So, the total HCl = HCl consumed when used with [tex]Na_{2} CO_{3}[/tex] + HCl consumed when used with [tex]NaHCO_{3}[/tex] .
0.5475 = [tex]\frac{75}{106}[/tex] X y + 0.2737
y = 0.3975
percentage of [tex]Na_{2} CO_{3}[/tex] in the mixture:
=[tex]\frac{0.3975}{15}[/tex] x 100
= 26.5%
Hence, The percentage composition of [tex]NaHCO_{3}[/tex] in the mixture on titration with mixture with 1.0 HCl is 26.5%.
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17. Given: CuSO
KlCul_K50)
Answer the following:
a. Determine the limiting reactant when 6.76 grams of copper(II) sulfate is reacted with 9.82
grams of potassium iodide?
b. Using the information from (a), what would be the mass of all three products?
C.
If 0.331 grams of iodine is produced, how many molecules of KI were reacted?
Answers
I think its c. I'm not 100% tho
A certain liquid has a density of 2.67 g/cm3. 30.5 mL of this liquid would have a mass of
Answers
Taking into account the definition of density, the mass of the liquid is 81.435 grams.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it measures the amount of mass in a given volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Mass of the liquidIn this case, you know that:
Density= 2.67 g/cm³Volume= 30.5 mL= 30.5 cm³ (being 1 mL= 1 cm³)Replacing in the definition of density:
2.67 g/cm³= mass÷ 30.5 cm³
Solving:
mass= 2.67 g/cm³× 30.5 cm³
mass= 81.435 g
In summary, the mass of the liquid is 81.435 grams.
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Why is it important for an organism to have both strong bonds (covalent and ionic) and weak interactions (van der Waals forces)?
Answers
Both strong bonds (covalent and ionic) and weak interactions (van der Waals forces) are important in the function of chemical molecules in an organism.
What are the interactions in living organisms?Now we know that organisms have various kinds of chemical interaction within them. These different kinds of interactions are responsible for the diverse properties we see in the organisms.'
Let us take the DNA molecule for instance, the atoms that compose the bases in the DNA molecule are all held together by covalent interactions. These are strong bonds.
On the other hand, the secondary structure of the DNA molecule owes to the hydrogen bonds and van der Waals forces that occur between the complimentary base pairs that we find in the DNA molecule.
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Help! What role does lactase play in breaking apart the disaccharide lactose?
lactase provides a binding site for lactose to initiate chemical breakdown.
lactase lowers the activation energy needed to begin breaking down lactose.
lactase releases heat during the breakdown of lactose.
lactase prevents too many disaccharide molecules from clumping together during chemical reactions
Answers
Lactase lowers the activation energy needed to begin breaking down lactose and is the role it plays in the reaction which is therefore denoted as option B.
What is an Enzyme?This is referred to as a biological catalyst which increases the rate of a chemical reaction and is usually specific in nature. Examples include lactase,amylase which have substrates such as lactose and starch respectively.
Lactase which is an enzyme is involved in the breaking apart of the disaccharide known as lactose by lowering the activation energy thereby increasing the rate of the reaction and ensuring that is easily done.
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if a heat sink has a temperature of 25°c, what is the change in entropy of the heat sink when 4000 j of heat energy is added to it? (1 point)
Answers
If a heat sink has a temperature of 25°C, the change in entropy of the heat sink when 4000J of heat energy is added to it is 13.42J/K.
How to calculate entropy?Entropy is the measure of the amount of energy in a physical system that cannot be used to do work.
The change in entropy, denoted by ∆S, can be calculated using the following formula:
∆S = Q/T
Where;
∆S = change in entropyQ = heat energy (J)T = temperature (K)According to this question, a heat sink has a temperature of 25°C, the heat temperature when 4000J of heat energy is added can be calculated as follows:
∆S = 4000J ÷ (25 + 273)
∆S = 4000J ÷ 298K
∆S = 13.42J/K
Therefore, if a heat sink has a temperature of 25°C, the change in entropy of the heat sink when 4000J of heat energy is added to it is 13.42J/K.
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Which of the following are homogenous mixtures?
1. Solid steel
2. An aqueous solution of salt
3. Molten salt
A) 2 and 3
B) 1, 2, and 3
C) 1 and 3
D) 1 and 2
Thanks!
Answers
Answer:
i aint go the f 40
Explanation:
swervin how u look so perfect on ur worst day
question 11 use the internet to look up the sds for 2.0 m sodium hydroxide, naoh, to answer the following questions: a) list the potential acute and chronic health effects. b) identify the first aid measures for ingestion. c) identify whether or not it is flammable d) identify the chemicals that potentially produce a dangerous reaction with naoh. e) describe how to handle small spills and the personal protective required to work with naoh.
Answers
The compound is basic in nature but the concentration substance is corrosive.
What is NaOH?Sodium hydroxide is a compound that is formed from sodium and hydrogen as well as oxygen The compound is basic in nature but the concentration substance is corrosive.
a) The acute health effect of exposure to NaOH is skin burn while the chronic effect of exposure is damage to the lungs.
b) The first aid for the ingestion of NaOH is to take in plenty of water.
c) The compound is not flammable
d) The chemicals that could produce a dangerous reaction with NaOH are acids
e) To handle small spills, irrigate the affected area with plenty water and use lab coats, gloves and eye wear when working with the solution.
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Why do we need to learn the proper way of writing and naming chemical compounds?
Answers
Answer:
To ensure that a spoken or written chemical name leaves no uncertainty concerning which chemical compound the name refers to
Andrew Huston states:
"Without the naming of compounds, we have no idea what we’re dealing with unless if you opt to state the chemical formula. Furthermore, a systematic way of naming compounds allows us to know more about the molecular structure and categorization just by the addition of a few suffixes/infixes/prefixes"