Explanation:
It is done by only one scientist at a time.
Answer:
It uses data and observations to make conclusions
Explanation:
Scientists are very careful whilst explaining. The other guy was incorrect.
A student is given a sample of unknown substance. He is asked to determine
if it is classified as a metal, a metalloid, or a non-metal. He discovered that the unknown element conducted some heat and electricity, had a shiny surface, and broke easily. This element is most likely a
Metal
Non-metal
Metalloid
Cannot be determined
The unknown element is most likely a metalloid. Metalloids have shiny surface and conduct electricity less than metals but are brittle in nature.
What are metalloids?Metalloids are a class of elements having chemical and physical properties intermediate to that of metals and non-metals.
Like metals, metalloids have shiny surfaces and appear like a metal but they conduct heat and electricity not as much as metals do.
Boron, germanium, silicon etc. are metalloids and they can form alloys with other metals to be useful in many applications. Metalloids are brittle in nature and thus break easily.
Hence, the sample that the student have is a metalloid and 3rd option is correct.
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(10pts) Post-Lab Questions Answer the following questions. (2pts) Suppose the concentration of the NaOH solution was 0.5 M instead of 0.1 M. Would this titration have required more, less, or the same amount of NaOH solution for a complete reaction? Choose... (2pts) Suppose you used 0.5 M NaOH to titrate your vinegar sample instead of 0.1 M. What effect does the concentration of base added have on the reliability of the results of your titration? Choose... (2pts) Consider a 0.238 M aqueous solution of sodium hydroxide, NaOH. How many grams of NaOH are dissolved in 23.46 mL? (2pts) How many individual hydroxide ions (OH−) are found in 23.46 mL? (2pts) How many moles of sulfuric acid, H2SO4, are neutralized by 23.46 mL of 0.238 M NaOH(aq)? [Hint: begin by writing a balanced equation for this neutralization reaction.] Total: -/28 pts
Answer:
A) Less amount of NaOH will be required
B) Reliability decreases with increase in concentration of NaOH solution
C) Mass of NaOH = 0.223 g
D) Number of hydroxide ions = 3.36 × 102²¹
E)Moles of H₂SO₄ neutralized = 0.00279 moles of H₂SO₄
Explanation:
A) Since the number of moles of acetic acid in the vinegar sample is constant, the number of moles of NaOH reacting with acetic acid is constant as well.
Volume = number of moles / concentration
Assuming, number of moles = 1, concentration = 0.1 M
Volume = 1/0.1 = 10
With increase in concentration,
Volume = 1/0.5 = 2
Therefore, less amount of NaOH will be required
B) An increase in concentration of base added will results in lesser volume of based used. This will result in an increase in percentage error as well as decrease innthe accuracy of determining the endpoint. Hence, reliability decreases
C) mass = concentration × volume × molar mass
Molar mass of NaOH = 40.0 g, volume of NaOH = 23.46 mL = 0.02346 L, concentration = 0.238 M
Mass of NaOH = 0.238 × 0.02346 × 40
Mass of NaOH = 0.223 g
D) number of moles of NaOH in 0.223 g = 0.233/40 = 0.00558 moles
1 mole of NaOH produces 1 mole of hydroxide ions; 0.00558 moles of NaOH will produce 0.00558 moles of hydroxide ions
Number of hydroxide ions in 0.00558 moles = 0.00558 × 6.02 × 10²³
Number of hydroxide ions = 3.36 × 102²¹
E) H₂SO₄ + 2 NaOH ----> Na₂SO₄ + 2 H₂O
1 mole of H₂SO₄ requires 2 moles of NaOH for complete neutralization
There are 0.00558 moles of NaOH in 23.46 mL of 0.238 M NaOH solution.
Moles of H₂SO₄ required to neutralize 0.00558 moles of NaOH = 0.00558/2
Moles of H₂SO₄ neutralized = 0.00279 moles of H₂SO₄
Which statement best describes what happens to protein when a steak is cooked?
It denatures and coagulates during cooking.
It decreases in size as amino acids are lost.
It loses bacteria because they are denatured.
It undergoes polymerization to form longer chains.
Answer:
A. It denatures and coagulates during cooking.
(Photo for proof at the bottom.)
Explanation:
All proteins coagulate by heat. Its natural characteristics disappear, or denatures, when cooked. Heat causes proteins to vibrate, and breaks bonds that hold the complex shape of the proteins. These broken strands of protein then stick together. In basic terms, the structure of protein changes when cooked.
Here's a photo of Edge incase you're doubtful.
Please click the heart if this helped.
Answer:
A
Explanation:
EDGE 2022
the work is in the photo can i get answers please (;´༎ຶٹ༎ຶ`)
Answer:
yes
Explanation:
it is
A 130 g sample of brass at 120.0 degrees Celsius is placed in a calorimeter cup that contains
130 g of water at 35.0 degrees Celsius. Disregard the absorption of heat by the cup and
calculate the final temperature of the brass and water. Specific heat of water = 4.18 J/gC,
specific heat of brass=0.380 J/gC. Attach your complete solution
Answer:
[tex]T_{EQ}=42.1\°C[/tex]
Explanation:
Hello there!
In this case, since we are looking for an equilibrium temperature, we can evidence how the net heat flow is 0 as all the heat released by the hot brass is absorbed by the water:
[tex]Q_{brass}+Q_{water}=0[/tex]
Thus, by writing that equation in terms of mass, specific heat and temperature we obtain:
[tex]m_{brass}C_{brass}(T_{EQ}-T_{brass})+m_{water}C_{water}(T_{EQ}-T_{water})=0[/tex]
Thus, by applying the following algebra, it is possible to arrive to a clean expression to obtain the equilibrium temperature:
[tex]m_{brass}C_{brass}T_{EQ}+m_{water}C_{water}T_{EQ}=m_{water}C_{water}T_{water}+m_{brass}C_{brass}T_{brass}\\\\T_{EQ}(m_{brass}C_{brass}+m_{water}C_{water})=m_{water}C_{water}T_{water}+m_{brass}C_{brass}T_{brass}\\\\T_{EQ}=}\frac{m_{water}C_{water}T_{water}+m_{brass}C_{brass}T_{brass}}{m_{brass}C_{brass}+m_{water}C_{water}}[/tex]
Then, by plugging the masses, specific heats and initial temperatures in, we obtain:
[tex]T_{EQ}=\frac{130g*4.184\frac{J}{g*\°C} *35.0\°C+130g*0.380\frac{J}{g*\°C}*120.0\°C}{130g*4.184\frac{J}{g*\°C} +130g*0.380\frac{J}{g*\°C}}\\\\T_{EQ}=42.1\°C[/tex]
Best regards!
The value of Avogadro number is
Calculate the work done by an object that applies 20 N of force to lift a block 10 m.
Answer:
Work Done= Force×Displacement
Thus
Work Done = 20×10
Work Done = 200Joules
Solutions, _____ colloids, _____ light.
a) like, will not scatter
b) unlike, will not scatter
c) like, will scatter
d) unlike, will scatter
Answer: unlike, will not scatter
Explanation:
Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.
Predict what will be observed in each experiment below. experiment predicted observation.
1. A student sees tiny bubbles clinging to the inside of an unopened plastic bottle full of carbonated soft drink. The student squeezes the bottle.
a. The bubbles will shrink, and some may vanish.
b. The bubbles will grow, and more may appear.
c. The bubbles won't change.
d. I need more information to predict what will happen to the bubbles.
2. A student has two unopened cans containing carbonated water. Can A has been stored in the garage () and can B has been stored in the fridge (). The student opens one can at the time, both cans make a fizz.
a. Can A will make a louder and stronger fizz than can B.
b. Can B will make a louder and stronger fizz than can A.
c. The fizz will be the same for both cans.
d. There is not enough information to predict which can will make the louder fizz.
Answer:
The correct answer is -
1. a) The bubbles will shrink, some may vanish.
2. a) Can A will make a louder and stronger fizz than can B.
Explanation:
In the first question, it is given that the bottle is not opened and therefore, squeezing the bottle filled with a carbonated drink will increase the pressure on the carbonated liquid which forces the bubbles to dissolve or displace or vanish as it moves to empty space.
Thus, the correct answer would be - The bubbles will shrink, some may vanish
In the second question, there are two different conditions for two different unopened cans of carbonated water that are different temperatures one at the garage with higher temperature and one in the fridge at low temperature. As it is known that higher the temperature less will be solubility of gas in liquid so gas in can A will be less soluble which means it has more gas and it will make louder and stronger fizz than B which was stored at low temperature.
thus, the correct answer would be - Can A will make a louder and stronger fizz than can B.
1. What do the colors indicate about the change in average temperature over time from 1884 to
2012?
The colors used to indicate the change in average temperature over time from 1884 to 2012 can vary depending on the specific visualization or representation being used. However, in many temperature visualizations, a common color scheme is employed to represent temperature anomalies or changes relative to a reference period.
In this color scheme, cooler temperatures are often represented by shades of blue or green, while warmer temperatures are depicted by shades of yellow, orange, or red. The intensity or darkness of the colors may also correspond to the magnitude of the temperature change.
For example, if a visualization shows a map with regions colored in blue or green, it suggests that those areas experienced a cooling trend or had lower average temperatures during the specified time period. Conversely, if the map shows regions colored in yellow, orange, or red, it indicates a warming trend or higher average temperatures.
By examining the distribution of colors on the visualization, one can gain insights into the spatial patterns and changes in average temperatures over the specified time frame.
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Two adaptations to plants are described below:
Adaptation 1: A hornwort is a nonflowering plant that produces a large number of spores instead of seeds.
Adaptation 2: A kangaroo paw has tiny, woolly hairs on it that help it hold onto water droplets.
Which statement is true about these adaptations?
Answer:
The answer is D
Explanation:
The hornwort is telling what that exact plant does and the kangaroo paw is telling what they do physically to hold onto water
The first adaptation is to the life cycle, and the second is to the physical traits thus, the kangaroo paw describes what they physically do to hold onto water, and the hornwort describes what that particular plant performs. So, the correct option is D.
What is Adaptation?A species or organism gradually grows more accustomed to its surroundings through the process of adaptation. The behavioral or physical characteristics of an animal that improve its ability to thrive in its ecosystem are referred to as adaptation. Animals can adapt by changing how they look to hide from predators (camouflage). To survive in their habitats, different species have evolved various adaptations.
In the above given example, the life cycle is the first adaptation, and the physical characteristics are the second. Therefore, the hornwort defines what that particular plant does, and the kangaroo paw represents what they physically do to hold onto water.
Therefore, the correct option is D.
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Please help due soon.
Answer:
water - Yes because the do drink water
Air - yes they need to breath or alse they would not do good
warmth - yes or they die from coldness
Light - yes to get there food
soil - yes nution for there roots
Explanation:
Hopes it helps
how many moles of C8 H18 are present in a 546.23 gram sample?
Answer:
Given:
Compound C8H18
mass of compound- 546.23 gram
To find:
number of moles =?
Solution:
let's find out the molar mass of C8H18= 12×8+18×1 = 114 gram/mole
Number of moles= given mass/molar mass
=546.23/114
= 4.7818436487 moles.
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Atoms of nickel and aluminum tend to
A. bond ionically to other metals.
B. be radioactive.
C. form anions.
D. form cations.
Answer: D. form cations.
I think
Explanation:
What is the total number of molecules of hydrogen in 0.25 mole of hydrogen?
1
6.0 10^23
2.
4.5 * 10^23
3
3.0 x 10^23
4
1.5 * 10^23
0.25 mole of hydrogen contains 1.5 * 10^23 molecules of hydrogen gas.
We have to know that the number of molecules in one mole of a substance is obtained from the Avogadro's number.
We know that;
1 mole of hydrogen contains 6.02 × 10^23 molecules of hydrogen
0.25 mole of hydrogen contains 0.25 mole × 6.02 × 10^23 molecules/1 mole
= 1.5 * 10^23 molecules
Therefore, 0.25 mole of hydrogen contains 1.5 * 10^23 molecules of hydrogen gas.
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why is a saturated solution of magnesium hydroxide less basic than a saturated solution of potassium hydroxide?
A.) magnesium hydroxide is less soluble than potassium hydroxide
B.) magnesium is less basic than potassium
C.) magnesium hydroxide solutions are just as basic as potassium hydroxide solutions
D.) when magnesium hydroxide dissolved the hydroxide ion is partially neutralized
Answer:
letter C I'm not sure to my answer but hope it can hrlp
The reason why magnesium hydroxide is less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.
What is a saturated solution?A saturated solution is one that contains as much solute as it can normally hold at a particular temperature.
We know that magnesium hydroxide is less soluble than potassium hydroxide. Hence, the reason why magnesium hydroxide is less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.
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what are three main components of the lipid bilayer portion of a plasma membrane?
a cholesterol, triglycerides and glyclipeds
b phospholipids , cholesterol and glycilipids
c phospholipidsm glycloproteins and water
d proteinsm cholesterol and fatty acids
e phospholipids cholesterol and proteins
Answer:
three reasons
Explanation:
plasma membrane, cytoplasm, nucleus 2)The three main components of the lipid bilayer portion of a plasma membrane are phospholipids, cholesterol, and glycolipids.
2. The approximate concentration of hydrochloric acid, HCl, in the stomach (stomach
acid) is 0.17M. Calculate the mass of the following antacids required to neutralize 50cm of
stomach acid.
(a) Bicarbonate of soda NaHCO3
(b) Aluminum hydroxide, Al(OH)3
Please .
Answer:
a) 0.714g of bicarbonate of soda are required.
b) 0.221g of Al(OH)₃ are required
Explanation:
The reactions of HCl with bicarbonate of soda and aluminium hydroxide are:
HCl + NaHCO₃ → H₂O + NaCl + CO₂
3 HCl + Al(OH)₃ → 3H₂O + AlCl₃
The moles of HCl that we need neutralize are:
50mL = 0.050L * (0.17mol / L) = 0.0085 moles HCl
To solve these problem we need to find the moles of the antacid using the chemical reaction and its mass using its molar mass;
a) Moles NaHCO₃ = Moles HCl = 0.0085 moles
The mass is -Molar mass NaHCO₃: -84g/mol-
0.0085 moles * (84g / mol) = 0.714g of bicarbonate of soda are required
b) 0.0085 moles HCl * (1mol Al(OH)₃ / 3mol HCl) = 2.83x10⁻³ moles Al(OH)₃
The mass is -Molar mass: 78g/mol-:
2.83x10⁻³ moles Al(OH)₃ * (78g/mol) =
0.221g of Al(OH)₃ are requiredA sealed 1.0L flask is filled with 0.500 mols of I_2 and 0.500 mols of Br_2. When the container achieves equilibrium the equilibrium constant is 1.10x10^{-2}. What is the equilibrium concentration of the product, IBr?
Answer:
[IBr] = 0.049 M.
Explanation:
Hello there!
In this case, according to the balanced chemical reaction:
[tex]I_2+Br_2\rightarrow 2IBr[/tex]
It is possible to set up the following equilibrium expression:
[tex]K=\frac{[IBr]^2}{[I_2][Br_2]} =0.0110[/tex]
Whereas the the initial concentrations of both iodine and bromine are 0.50 M; and in terms of [tex]x[/tex] (reaction extent) would be:
[tex]0.0110=\frac{(2x)^2}{(0.50-x)^2}[/tex]
Which can be solved for [tex]x[/tex] to obtain two possible results:
[tex]x_1=-0.0277M\\\\x_2=0.0245M[/tex]
Whereas the correct result is 0.0245 M since negative results does not make any sense. Thus, the concentration of the product turns out:
[tex][IBr]=2x=2*0.0249M=0.049M[/tex]
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How many moles of Ba(OH)2 are present in 205 mL of 0.400 M Ba(OH)2
Answer:
0.082 moles
Explanation:
To answer this question we'll need to use the definition of molarity:
Molarity = moles / litersWe are given the molarity and mililiters, so now we convert 205 mL into L:
205 mL / 1000 = 0.205 LNow we can calculate the number of moles:
0.400 M = moles / 0.205 L
moles = 0.082 molesWhat happens when an acid is dissolved in water?
A.) the covalent bonds within the acid molecule are strengthened
B.) the hydrogen atom repelled by the water molecules
C.) the hydrogen atom is attracted to the lone pair electrons on the oxygen atom of water
D.) the hydrogen atom is attracted to the hydrogen atoms of water
Consider the structures of benzaldehyde and benzyl alcohol. Benzene ring with a CH2OH attached Benzene ring with an aldehyde group attached. These two structures can be distinguished by proton NMR. The hydrogen of the aldehyde group will appear downfield between 9 and 11 ppm and there is Choose... for the alcohol. Also, the methylene hydrogens in the benzyl position of the alcohol will be the only significant Choose... peak between the two structures.
Answer:
no equivalent peak, upfield between 0 and 3 ppm
Explanation:
NMR stands for nuclear magnetic resonance. It is a spectroscopic technique that is used for observing the local magnetic fields around an atomic nuclei. It is used to study the chemical, physical and biological properties of the matter.
In the context, the structures of the benzaldehyde and the benzyl alcohol are distinguished by the proton NMR. The hydrogen atom of aldehyde appears downfield between 9 and 11 ppm and also there is no equivalent peak for the alcohol.
The methylene hydrogens will only be significant upfield between the 0 and 3 ppm peak between the given structures.
Name 2 physical properties that would allow differentiation between copper, lead and iron shot.
Answer:
Two physical properties that would allow differentiation between copper, lead and iron shot are - Color and Density
COPPER - Color - Copper has a reddish brown color .
Density - Density of copper is 8.96 [tex]g/cm^{3}[/tex]
LEAD - Color - Lead is grey in color.
Density - Density of Lead is 11.34[tex]g/cm^{3}[/tex]
IRON SHOT - Color- Iron shot is in grey color with extra shine .
Density - Density of iron shot is 10.49 [tex]g/cm^{3}[/tex]
Explanation:
COPPER- Copper (Cu) is a reddish, highly ductile metal that belongs to Group 11 (Ib) of the periodic table and is a particularly excellent conductor of electricity and heat. Copper is found in nature in its free metallic state.
LEAD- Lead (Pb) is a soft, silvery white or grayish metal in Periodic Group 14 (IVa). Lead is a weak conductor of electricity and is very malleable, ductile, and thick. Lead, which has been known since antiquity and is considered the oldest of metals by alchemists, is extremely durable and corrosion-resistant, as evidenced by the continued use of lead water pipes constructed by the ancient Romans.
IRON SHOT - Small round iron balls used as projectiles are known as iron shot. Balance scales are used with simple weights. Iron balls are used in the shot put competition.
Hence , the differentiation is mentioned in the above answer.
A solution contains 6 mg isopropanol dissolved in 2 kg H2O. The isopropanol concentration is
a.3% isopropanol.
b.3 M isopropanol.
c.3 m isopropanol.
d.3 ppm isopropanol.
Answer:
Option D. 3 ppm isopropanol
Explanation:
The following data were obtained from the question:
Mass of isopropanol = 6 mg
Mass of water = 2 Kg
Isopropanol concentration =?
The isopropanol concentration can be obtained as follow:
Concentration = mass isopropanol / mass of water
Isopropanol concentration = 6 mg / 2 kg
Isopropanol concentration = 3 mg/Kg
Finally, we shall convert 3 mg/Kg to ppm. This can be obtained as follow:
1 mg/Kg = 1 ppm
Therefore,
3 mg/Kg = 3 ppm
Thus, we can conclude that the concentration of isopropanol is 3 ppm.
balance CH4+O2->CO2+H2O
Explanation:
I hope this helps Chemistry is so hard and I hate it
Reduction of methanal equation
Answer:
hi
Explanation:
than you for points and thank me if you like
1) How many atoms are in 0.54 moles of Cu?
200.0 mL of a 0.600 M solution of KCl is diluted to 600.0 mL. What is
the new concentration of the solution?
Answer:
0.200 M
Explanation:
Begin by finding how many moles of KCl there are by using the molarity and given volume:
[tex]\frac{0.600 mol}{1000 mL} x \frac{200.0 mL}{1} = 0.12 mol KCl[/tex]
(Remember that molarity is mol/L, which is equal to mol/1000 mL.)
Next, divide the moles of KCl by the new volume (after dilution):
[tex]\frac{0.12 mol KCl}{600.0 mL} x \frac{1000 mL}{1 L} = \frac{0.200 mol KCl}{1 L} = 0.200 M[/tex]
The new concentration is 0.200 M.
The new concentration of the KCL solution is 0.200M
HOW TO CALCULATE CONCENTRATION:
The concentration or molarity in mol/L or M of a solution can be calculated using the following formula:C1V1 = C2V2
Where;
C1 = initial concentration of the solution
C2 = final concentration of the solution
V1 = initial volume of the solution
V2 = final volume of the solution
According to the information given in this question, we have the following:V1 = 200mL
V2 = 600mL
C1 = 0.600 M
C2 = ?
C2 = C1V1 ÷ V2
C2 = (0.600 × 200) ÷ 600
C2 = 120 ÷ 600
C2 = 0.2M
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Can light from the sun cause ink to become visible
Yes. Light from the sun can pull energy out of the ink, causing it to become visible
___________________________________
Sorry if wrong
PLEASE ANYONE KNOW IT!!!!!
I think it's ethane. It might be wrong tho.