In the experiment comparing the effect of acid rain on samples from two different lakes, the scientist is likely investigating the impact of acid rain on the water quality and ecosystem of these lakes.
Acid rain refers to rainfall that has a lower pH value than normal, typically due to the presence of pollutants such as sulfur dioxide (SO2) and nitrogen oxides (NOx) in the atmosphere.
When acid rain falls on lakes, it can alter the water's acidity, affecting various organisms and ecological processes.
The experiment might proceed as follows:
Sample collection: The scientist would gather water samples from two different lakes, ensuring that they are representative of the lakes' conditions. The samples should be collected prior to any acid rain exposure.
Experimental setup: The scientist would set up controlled conditions to simulate acid rain exposure. This might involve preparing separate containers or tanks for each lake sample.
Acid rain simulation: The scientist would add acidifying agents (such as sulfuric acid or nitric acid) to one set of lake samples, representing the acid rain treatment group. The other set of lake samples would serve as the control group and would not be exposed to acid rain.
Monitoring parameters: The scientist would measure and monitor various parameters before and after the acid rain treatment. These might include pH levels, water clarity, dissolved oxygen, nutrient concentrations, and the abundance and diversity of aquatic organisms.
Duration and repetition: The experiment may be carried out over a specific time period, with regular measurements and observations. Depending on the research goals, the experiment may be repeated multiple times to ensure consistency and reliability of results.
Data analysis: Once the experiment is completed, the scientist would analyze the data collected. Statistical methods might be used to compare the parameters measured between the acid rain-treated samples and the control samples. The analysis would reveal the effects of acid rain on the two lakes and help draw conclusions about the impact on their respective ecosystems.
It's important to note that this description provides a general outline of how the experiment could be conducted. The specific details and methodology may vary depending on the objectives, resources, and constraints of the experiment.
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Calculate the molar mass of ferric oxide (Fe
2
O
3
). Show the working and keep 3 decimal places. (Refer to QCA for the periodic table of the element).
The molar mass of ferric oxide (Fe2O3) is 159.687 g/mol. We can round it off to 159.687 g/mol because we are only asked to keep three decimal places.
Ferric oxide (Fe2O₃) is a chemical compound.
In this question, we are required to compute its molar mass, given that the compound has two iron atoms, three oxygen atoms. We will use the periodic table given in the QCA (as instructed in the question) to look up the atomic masses of the constituent elements and then sum them up to get the molar mass.
Calculation of Molar Mass of Ferric Oxide (Fe2O₃)
We have to multiply the atomic mass of each element by the number of atoms present in the molecule, and then add up the resulting products to get the molar mass.
Therefore:
Atomic mass of Fe = 55.845 g/mol.
The molecular formula of Fe2O3 has two Fe atoms in it.
Thus, the total atomic mass of Fe = 55.845 g/mol x 2 atoms = 111.690 g/mol.
Atomic mass of O = 15.999 g/mol.
The molecular formula of Fe2O3 has three O atoms in it.
Thus, the total atomic mass of O = 15.999 g/mol x 3 atoms = 47.997 g/mol.
Now we can add up the atomic masses of Fe2O3:
Molar mass of Fe2O3 = 111.690 g/mol + 47.997 g/mol= 159.687 g/mol
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Urgent help please!!
Answer:
1. 2.1 moles of Mg
2. 0.72 mole of Mg(OH)2
Explanation:
1. We'll begin by writing the balanced equation for the reaction. This is given below:
3Mg + 2AlBr3 —> 3MgBr2 + 2Al
From the balanced equation above, 3 moles of Mg reacted to produce 2 moles of Al.
Therefore, Xmol of Mg will react to produce 1.4 moles of Al i.e
Xmol of Mg = (3 x 1.4)/2
Xmol of Mg = 2.1 moles.
Therefore, 2.1 moles of Mg is required to 1.4 moles of Al.
2. We'll begin by calculating the number of mole in 26g of water, H2O.
This is illustrated below:
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O = 26g
Number of mole of H2O =?
Mole = Mass /Molar Mass
Number of mole of H2O = 26/18
Number of mole of H2O = 1.44 moles
Next, we shall write the balanced equation for the reaction. This is given below:
2HNO3 + Mg(OH)2 —> Mg(NO3)2 + 2H2O
Finally, we can obtain the number of mole of Mg(OH)2 used in the reaction as follow:
From the balanced equation above,
1 mole of Mg(OH)2 reacted to produce 2 mole of H2O.
Therefore, Xmol of Mg(OH)2 will react to produce 1.44 moles of H2O i.e
Xmol of Mg(OH)2 = (1 x 1.44)/2
Xmol of Mg(OH)2 = 0.72 mole.
Therefore, 0.72 mole of Mg(OH)2 was used in the reaction.
Choose the COEFFICIENTS that balance the equation by the inspection method.
Answer:
somebody please help her or him please please
The isomerization of cyclopropane to propylene is a first-order process with a half-life of 19 minutes at 500 °C. The time it takes for the partial pressure of cyclopropane to decrease from 1.0 atmosphere to 0.125 atmospheres at 500 °C is closest to... (A) 38 minutes (B) 57 minutes (C) 76 minutes (D) 152 minutes (E) 190 minutes
t = 57 min., Therefore, we can say that it takes 57 minutes for cyclopropane's partial pressure to drop from 1 atm to 0.125 atm at 500°C.
Is the first-order isomerization of cyclopropane to propylene?Propene (CH3CH=CH2) is produced by the isomerization of cyclopropane, which is a first-order process. A sample of cyclopropane converts to propene in 79 minutes at 760 K.
Isomerization: first-order reaction or not?The reaction is a first-order reaction because it is an isomerization reaction, and its rate constant is expressed in terms of minutes. The sum of the powers or exponents that the concentration terms are raised in the rate law expression can be used to define the order of a reaction.
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in which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
Answer:
G - H2SO4
Explanation:
two hydrogen atoms and 4 oxygen atoms
An atom has 47 protons 61 neutrons and 47 electrons.
what is the charge of the atom's nucleus??
Please explain the answer because i'm trying to understand it but i can't. I watch videos and ask for help from the teacher but i just can't get it. so PLEASE explain it.
Answer:
An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons.
Explanation:
Composition of the Atom. The atom consists of a tiny nucleus surrounded by moving electrons. The nucleus contains protons, which have a positive charge equal in magnitude to the electron's negative charge. The nucleus may also contain neutrons, which have virtually the same mass but no charge. The nucleus has an overall positive charge as it contains protons. Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. There are three subatomic particles: protons, neutrons, and electrons. Two of the subatomic particles have electrical charges: protons have a positive charge while electrons have a negative charge. I hope this helps you :)
mass density and volume of molasses
Answer:
yo m ok mama
Explanation:
tjdjsjsjsjwbebsbshsh
Which molecule functions by inhibiting T cell activation through ITIM domain signaling?
a. CD28
b. CD80
c. TLR5
d. PD-1
PD-1. PD-1 (Programmed cell death protein 1) is a molecule expressed on the surface of activated T cells that functions as an immune checkpoint inhibitor.
The correct answer is d.
It binds to its ligands, PD-L1 and PD-L2, on antigen-presenting cells, leading to the activation of ITIM (Immunoreceptor tyrosine-based inhibitory motif) domains in the cytoplasmic tail of PD-1. This results in the inhibition of T cell activation, preventing excessive immune responses and maintaining immune homeostasis. PD-1 is commonly targeted in cancer immunotherapy, as the expression of PD-L1 by tumor cells can allow them to evade the immune system. Inhibiting PD-1/PD-L1 interactions can restore T cell function and enhance anti-tumor immunity. CD28 and CD80 are co-stimulatory molecules that enhance T cell activation, while TLR5 is a Toll-like receptor that recognizes bacterial flagellin and initiates innate immune responses.
In contrast, CD28, CD80, and TLR5 do not inhibit T cell activation via ITIM domain signaling. CD28 acts as a co-stimulatory molecule for T cell activation, CD80 is a ligand for both CD28 and CTLA-4 receptors, and TLR5 is a pattern recognition receptor involved in innate immune responses.
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GIVE REASON : Aluminum foils are used to wrap food items. PLEASE GIVE THE ANSWER FAST.
What is the difference in the number of
protons in an atom of Silver than an
atom of Germanium
Answer:
Silver has 47 protons as well as 47 electrons.
Germanium has 32 protons as well as 32 electrons.
Explanation:
Jim needs to conduct his experiment at STP .Which condition must he use?
Answer:
273 K, 101.3 kPa
Explanation: I just did the quiz
To acquires STP condition, Jim must apply a temperature 298 K and 1 atm pressure. At STP condition one mole of all gases occupies a volume of 22.4 liters.
What is STP condition ?The standard temperature and pressure is called STP condition. A temperature of 298 K and pressure of 1 atm is called standard temperature and pressure.
At STP condition, the volume of one mole of any substance is 22.4 liters. One mole corresponds to 6.02 × 10²³ molecules. By satisfying the STP condition, we can determine the volume, and other mole parameters of a compound.
Experiments can be conducted at STP condition by applying a temperature of 298 K which is equal to 25°C and a pressure of 1 atm. He can use a thermometer and barometer to measure and set the values of temperature and pressure.
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Surface processes that increase seawater salinity include one of the following? a. icebergs melting b. evaporation c. see ice melting d. runoff e. precipitation
Option b. Evaporation increases seawater salinity.
What is seawater salinity?While seawater is generally 3.1-3.8% salinity, or between 31 and 38 g/kg, it is not consistently salty everywhere in the world. Seawater can be significantly less salty when it mixes with freshwater flow from river mouths, close to glaciers that are melting, or in areas where there has been a lot of precipitation (such as during the Monsoon). The Red Sea is the saltiest open sea due to its high rates of evaporation, lack of precipitation and river runoff, and restricted circulation. In fact, the Dead Sea's salinity is nearly ten times higher than that of other isolated bodies of water. The "Practical Salinity Scale," which assessed salinity in "practical salinity units (PSU)," was a well-liked scale.To know more about evaporation ,refer:
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You're working in a lab at Clemson university, and your professor wants to make one of the existing polymers stronger and more rigid. He says, "Pop quiz, lab rats. What do we need to do to this polymer to strengthen it?" Explain two simple ways synthetic polymers can be made stronger and more rigid?
Cross-linking polymers not only increases the tensile strength of the polymer, but it also changes the polymer's elastic properties.
What are polymers ?The term polymer is defined as any of a class of natural or synthetic material composed of very large molecules, called macromolecules, that are multiples of simpler chemical units called monomers.
Adding cross-links between polymer chains initially makes the polymer more elastic. The introduction of short chains of sulfur atoms that link the polymer chains in natural rubber, for example, results in the vulcanization of rubber. The polymer becomes more rigid as the number of cross-links increases.
Thus, Cross-linking polymers not only increases the tensile strength of the polymer, but it also changes the polymer's elastic properties.
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what is the major organic product obtained from the addition reaction of hcl to 3-methyl-1-butene? group of answer choices 1-chloro-2-methylbutane 1-chloro-3-methylbutane 2-chloro-2-methylbutane 2-chloro-3-methylbutane 1-chloropentane
The major organic product obtained from the addition reaction of HCl to 3-methyl-1-butene is 2-chloro-3-methylbutane. Option d is correct.
The reaction mechanism involves the electrophilic addition of HCl to the double bond of the 3-methyl-1-butene, leading to the formation of a carbocation intermediate. The H⁺ ion from HCl acts as an electrophile, attacking the double bond and forming a carbocation on the tertiary carbon. The chloride ion then acts as a nucleophile, attacking the carbocation and forming the final product.
The addition of HCl to the double bond results in the formation of two possible carbocation intermediates, one on the primary carbon and the other on the tertiary carbon. However, the more stable tertiary carbocation intermediate is formed faster and is favored under the reaction conditions. The chloride ion then attacks the tertiary carbocation, resulting in the formation of the product, 2-chloro-3-methylbutane. Option d is correct.
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8) F2(g) + CaBr2(g) -> CaF2(g) + Brz(g)
What type of reaction is shown above?
A) synthesis
B) decomposition
C) single replacement
D) double replacement
For any two integers a and b , A plus B square equals a square plus B square
After evaluating perfect square binomial, the expression "(a + b)² = a² + b²" is False.
What is a numerical data?A numerical data is also referred to as a quantitative data and it can be defined as a data set that is primarily expressed in numbers only. This ultimately implies that, a numerical data refers to a data set consisting of numbers rather than words.
The types of numbers.In Mathematics, there are six (6) common types of numbers and these include the following:
Natural (counting) numbersWhole numbersRational numbersIrrational numbersReal numbersIntegersWhat is an integer?An integer can be defined as a whole number that may either be positive, negative, or zero.
Evaluating the given perfect square binomial, we have:
(a + b)² = (a + b)(a + b)
(a + b)² = a² + ab + ab + b²
(a + b)² = a² + 2ab + b² ≠ a² + b² (False).
Therefore, we can logically deduce that the expression "(a + b)² = a² + b²" is False.
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Complete Question:
True or False: For any two integers a and b, (a + b)² = a² + b²
Which of the following olosaic structures represents a poskwe 9 protons, 10 mentions and 10 elections 12 protons, 1814 neutrons and 12 elections 12 protons, 12 neutrons and 10 elections
Answer:
migraine
Explanation:
d
Why does the radius of the elements decrease moving across a row when the atomic masses increase going in the same direction?
Answer:
"The effect of increasing proton number is greater than that of the increasing electron number therefore, there is a greater nuclear attraction."
Explanation:
I got this off of Gogle, I would suggest using it for questions like this. I hope you have good luck on other questions! :)
which of the following is a combustion reaction ? ( please answer asap !! ) <3
Answer: 3
Explanation:
The aromatic hydrocarbon cymene (C10H14, molar mass is 134.21 g/mol) is found in nearly 100 spices.The complete combustion of 1.608 g of cymene in a bomb calorimeter (heat capacity is 3.640 ) produces an increase in temperature of 19.35.What is the enthalpy of combustion of cymene?
The enthalpy of combustion of cymene is -3475.18 kJ/mol.
To calculate the enthalpy of combustion, we need to use the formula:
ΔH = q / n
where ΔH is the enthalpy of combustion, q is the heat released during the combustion, and n is the number of moles of cymene combusted.
First, we need to calculate the number of moles of cymene combusted:
moles = mass / molar mass = 1.608 g / 134.21 g/mol = 0.012 mol
Next, we calculate the heat released during the combustion using the equation:
q = C × ΔT
where C is the heat capacity of the bomb calorimeter and ΔT is the temperature increase.
q = 3.640 kJ/°C × 19.35 °C = 70.494 kJ
Now we can calculate the enthalpy of combustion:
ΔH = q / n = 70.494 kJ / 0.012 mol = -3475.18 kJ/mol
Therefore, the enthalpy of combustion of cymene is approximately -3475.18 kJ/mol. The negative sign indicates that the combustion is exothermic, meaning heat is released during the process.
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Using the periodic table predict which three elements will have similar chemical properties or reactivity
oxygen, sulfur and selenium as they are all in the same group of the periodic table - they are all chalcogens
Matter is classified as a
A.homogeneous or heterogeneous mixture
B.substance or a mixture of substances
C.substance, only
D.mixture of compounds
Matter is classified as a substance or a mixture of substances.
Pure substances and mixtures are the two subgroups of matter. Elements and compounds are formed through the further division of pure substances.
Physically coupled structures known as mixtures can be disassembled into their component parts. One particular sort of atom or molecule makes up a chemical compound.
what is the frequency of radio
Question
Answer
Explanation
Radio Frequency Is one of the electromagnetic frequency waves that lie in the range stretching from below 3 kilohertz to around 300 gigahertz and which includes the frequencies used for communication signals (such as for radio and television broadcasting and cellular telephone and satellite transmissions)
I hope this helps
how many H atoms are in 17.5 g (NH4)2C2O4?
There are 7.253 x 10^24 H atoms in 17.5 g (NH4)2C2O4.
What is Avogadro's number?Avogadro's number is the number of atoms, molecules, or particles in one mole of a substance, which is approximately 6.022 x 10^23.
To determine the number of H atoms in 17.5 g (NH4)2C2O4, we need to first calculate the number of moles of (NH4)2C2O4 using its molar mass and then use the mole ratio between H atoms and (NH4)2C2O4.
The molar mass of (NH4)2C2O4 can be calculated as follows:
Molar mass of NH4 = 14.01 g/mol
Molar mass of C2O4 = 2 * 12.01 g/mol + 4 * 16.00 g/mol = 88.04 g/mol
Molar mass of (NH4)2C2O4 = 2 * molar mass of NH4 + molar mass of C2O4
= 2 * 14.01 g/mol + 88.04 g/mol
= 116.06 g/mol
Number of moles of (NH4)2C2O4 = mass / molar mass
= 17.5 g / 116.06 g/mol
= 0.1507 mol
The mole ratio between H atoms and (NH4)2C2O4 is 8:2, which means that there are 8 H atoms for every 2 (NH4)2C2O4 units. Therefore, we can calculate the number of H atoms as follows:
Number of H atoms = 8 * Avogadro's number * number of moles of (NH4)2C2O4
= 8 * 6.022 x 10^23 * 0.1507
= 7.253 x 10^24 H atoms
Therefore, there are approximately 7.253 x 10^24 H atoms in 17.5 g (NH4)2C2O4.
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How many grams of water can be formed when 80 grams of sodium hydroxide (NaOH) reacts with an excess of sulfuric acid, H2SO4, in solution?
2NaOH + H2SO4 --> Na2SO4 + 2H2O
_____ grams water
Answer:
36g of H2O.
Explanation:
We'll begin by writing the balanced equation for the reaction:
2NaOH + H2SO4 —> Na2SO4 + 2H2O
Next, we shall determine the mass of NaOH that reacted and the mass of H2O produced from the balanced equation. This is illustrated below:
Molar mass of NaOH = 23 + 16 + 1 = 40g/mol
Mass of NaOH from the balanced equation = 2 x 40 = 80g
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 2 x 18 = 36g.
From the balanced equation above, we can see evidently that:
80g of NaOH reacted to produce 36g of H2O.
Which of the following conclusions can be made about the sedimentary layers?
bed 2 was deposited after bed 3
bed 2 was deposited before bed 3
bed 3 was deposited before bed 1
bed 1 is the youngest
Answer:
I think it's the second one im not sure tho
Hope this helps :)
If 2g of zinc granule wa reacted with exce dilute HCL to evolved hydrogen ga which came to completion after 5minute. Calculate the rate of the chemical reaction in g/hr
The rate of the chemical reaction is 25 g/hr.
What is rate of chemical reaction?Reaction rate or reaction rate is the rate at which reactants are converted into products. When we talk about chemical reactions, the fact is that the rate at which they occur varies greatly. Some chemical reactions are almost instantaneous, while others usually take some time to reach a final equilibrium.
Factors affecting the speed of a reaction
The speed of a reaction depends largely on the type and nature of the reaction. As mentioned earlier, some reactions are naturally faster than others, while some reactions are very slow. The physical state of the reactants, the number of reactants, the complexity of the reaction and other factors also greatly affect the speed of the reaction. Reaction rates are usually slower in liquids compared to gases and slower in solids compared to liquids.Therefore,
The Rate of reaction refers to the rate at which reactants are used up or the rate at which products appear.
So, the formula for the rate of reaction is as follows:-
\(rate of reaction= \frac{mass\ of\ the\ reactant\ used up}{time taken}\)........(1)
Mass of reactant used up= 2g
Time taken = 5 minutes
Convert the time in minutes to hour as follows:-
t(hour) = \(5mint\times\frac{1 hour}{60 min}\)
= 0.08 hour
Substitute the given values in equation (1) as follows:-
rate of reaction= \(\frac{2g}{0.08 hour}\) = 25g/hr.
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in an acetic acid/acetate buffer system, what will neutralize the addition of a strong base? a.) water b.) acetate c.) hydronium ion d.) acetic acid
Acetic acid will neutralize the addition of a strong base in an acetic acid/acetate buffer system.
In an acetic acid/acetate buffer system, the main purpose is to resist changes in pH when small amounts of acid or base are added. When a strong base is added, it increases the concentration of hydroxide ions (OH-) in the solution, which can shift the pH towards the basic side.
To neutralize the added strong base and maintain the buffer system, acetic acid (CH3COOH) acts as the main keyword. Acetic acid, being a weak acid, can react with the hydroxide ions (OH-) to form water (H2O) and acetate ions (CH3COO-). This reaction helps in counteracting the increase in hydroxide ions, thereby stabilizing the pH of the buffer system.
Water (H2O), acetate ions (CH3COO-), and hydronium ions (H3O+) are already present in the buffer system and do not actively neutralize the strong base. It is the addition of acetic acid that replenishes the buffer's acid component and maintains its pH buffering capacity.
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A 3.00 L sample of paint that has a density of 4.65 g/mL is found to contain 33.1 g lead (II) nitride. Determine (A) how many grams of lead ion are in the paint sample? (B) How many ions of lead are in the paint? (C) what is mass percentage of lead in the paint/ What is the ppm?
1) Grams of lead.
Convert grams of lead (II) nitride to moles of lead (II) nitride
\(molofPb_3N_2=33.1gPb_3N_2\cdot\frac{1molPb_3N_2}{649.61gPb_3N_2}=0.0509lofPb_3N_2\)Convert moles of lead (II) nitride into moles of Pb
\(\text{molesofPb}=0.0509molPb_3N_2\cdot\frac{3\text{molPb}}{1molPb_3N_2}=0.1527\text{molPb}\)Convert moles of Pb into grams of Pb
\(\text{gofPb}=0.1527\text{molPb}\cdot\frac{207.2\text{ g Pb}}{1\text{molPb}}=31.64\text{ g Pb}\)There is 31.64 g of ions of lead in the sample of paint.
9. In terms of Material Sustainability Attribute what HPD stands for? 10. What VOC stands for in terms of sustainability? 11. Single attribute product sustainability attributes are assessed for particular issues such as: a. thermal performance b. emission of VOCs, c. energy performance d. total cost of the building e. a,bc 12. International Green Construction Code a. Developed by ICC in response to demand and initiatives such as LEED. b. Baseline code as opposed to a multi-tiered rating system. c. Applies primarily to non-residential building. d. Newly developed and not yet widely adopted, and has some conflicts with the LEED certification process. e. All of the above 13. Lumber applies to wood products derived directly from logs through sawing and planning operations with no other manufacturing except cutting to length. True False 14. The terms lumber, solid lumber, solid sawn lumber, and sawn lumber are synonymous. True False 15. Wood compare with other structural materials a. Low strength per weight ratio b. High strength per weight ratio 16. Wood is much stronger by weight than concrete. True False 17. Concentric annual rings are visible in the vertical section of a tree and provide a good estimation of the age of the tree True False
9. In terms of Material Sustainability Attribute HPD gives information about a product's content, any potential health hazards associated with the product, and the safe handling and disposal of the product.
10. In terms of sustainability, VOC gives information about chemicals emitted by building materials and finishes that can cause negative health effects for people and contribute to air pollution.
11. Single attribute product sustainability attributes are assessed for particular issues such as emission of VOCs, thermal performance, and energy performance. Thus, option E. (a, b, c) is correct.
12. International Green Construction Code is developed by ICC (International Code Council) in response: all of the above is the correct answer (Option E).
13. The statement "lumber applies to wood products derived directly from logs through sawing and planning operations with no other manufacturing except cutting to length" is true.
14. The statement "the terms lumber, solid lumber, solid sawn lumber, and sawn lumber are synonymous" is true.
15. Wood is known for its high strength-per-weight ratio as compared to other structural materials. (Option B).
16. The statement "Wood is much stronger by weight than concrete" is false because wood is less strong by weight than concrete.
17. The statement "Concentric annual rings are visible in the vertical section of a tree and provide a good estimation of the age of the tree" is true.
HPD stands for Health Product Declaration. In terms of Material Sustainability Attribute HPD gives information about a product's content, any potential health hazards associated with the product, and the safe handling and disposal of the product. VOC stands for Volatile Organic Compounds. In terms of sustainability, VOC gives information about chemicals emitted by building materials and finishes that can cause negative health effects for people and contribute to air pollution.
International Green Construction Code is developed by ICC (International Code Council) in response to demand and initiatives such as LEED. It is a baseline code as opposed to a multi-tiered rating system. It applies primarily to non-residential buildings. It is newly developed and not yet widely adopted and has some conflicts with the LEED certification process.
Thus, the correct answer is
11. E
12. E
13. True
14. True
15. B
16. False
17. True
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