Answer:
A Carbon
Explanation:
The type of surface that warms up the slowest is .
Answer:
Answer might be Water...
A surface with a high reflectivity or low heat conductivity typically warms up at the slowest rate. Ice, snow, and some metals, like aluminium, are examples.
A smooth surface is one that doesn't have any ridges or other surface imperfections. It is smooth and devoid of any roughness, dents, or lumps. This kind of surface, which is highly reflective, is frequently seen in materials like glass, polished metal, or plastic. Rough texture: An uneven or irregular texture is indicative of a rough surface. It has lumps, ridges, or other abnormalities that microscopically obstruct the smoothness. Rough surfaces reduce the reflecting qualities of light by scattering it in many directions. Wood, concrete, or coarse fabrics are a few examples of rough surfaces.
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How much energy is released if a sample loses 0.001 kg mass through radioactive decay?
Explanation:
because the energy it can't be calculated
Which of the following statements supports the idea that light behaves as a wave?
A.
Photons change direction when they interact with electrons.
B.
Light bends as it passes from one medium to another.
C.
The kinetic energy of an electron increases when light of high frequency is incident on it.
D.
There are gaps in the absorption spectrum as light is absorbed at certain frequencies.
Answer:
It's B
Explanation:
as I answered it in study island.
How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
O 1 mol of oxygen has fewer molecules.
O 1 mol of oxygen has more molecules.
O Each sample has the same number of molecules.
O The molecules cannot be compared without knowing the mass.
Answer:
The molecules cannot be compared without knowing the mass.
A piece of metal weighing 0.035 kg was submerged in a graduated cylinder containing water. The water level rose from 2.0 mL to 9.0 mL. What is the density in g/mL of the metal
Taking into account the definition of density, the density of the metal is 5 [tex]\frac{g}{mL}[/tex].
What is densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
This caseIn this case, the increase in the volume of water in the cylinder is due to the volume of the metal. This means that the volume of the metal can be calculated by taking into account the volume occupied by the water + the metal and the volume occupied by the water alone in the cylinder.
Then, you know that:
Mass= 0.035 kg= 35 g (being 1 kg=1000 g)Volume= Volumen water + the metal - Volume water= 9 mL - 2 mL= 7 mLReplacing in the definition of density:
[tex]density=\frac{35 g}{7 mL}[/tex]
Solving:
density= 5 [tex]\frac{g}{mL}[/tex]
In summary, the density of the metal is 5 [tex]\frac{g}{mL}[/tex].
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Give a brief description of the symptoms associated with dissociative fugue.
Answer:
People may seem and act normally during the fugue, or they may appear moderately bewildered and draw no notice. When the fugue is over, however, people are thrown into a new scenario with no recall of how they got there or what they were doing.
Explanation:
One of the examples of homologous series is given below:
CH3OH
CH3CH2OH
X
CH3CH2CH2CH2OH
i. Define homologous series,
ii. Find the mass difference between successive members of above homologous series and calculate the molecular mass of x.
iii What is the reason behind the highest boiling point bu least solubility of the fourth member in the given series?
Homologous series: Homologous series is the series in which the functional group of any compound and their chemical properties are similar, the difference between any two successive members is same.
Above homologous series is of Alkanol
[tex] \tiny\sf \: general \: formula \: for \: Alkanol \rightarrow C_nH_{2n+2}O[/tex]
Above homologous series is differed by methylene (-CH2-) group. hence the mass diffrence between them would be the mass of -CH2- group.
[tex] \small \sf \: CH_2 = = 12+1+1 = 14 \: a.m.u. \\ \hline[/tex]
The compound X is next to CH3CH2OH hence, X will have molecular formula CH3CH2CH2OH which is obtained by addition of a methylene group.
[tex]\tiny\: the \: compound \: x \: (n = 3) \: have \: general formula =C_3H_{8}O \\ \small \sf \: The \: molecular \: mass \: of \: X =3 \times 12 + 8 \times 1 + 16 \\ \sf = 60 \: a.m.u[/tex]
The reason behind the highest boiling point of butanol is his molecular mass, the main reason is the surface area, as the molecular mass increases surface area also increases which lead to increase in the vanderwall forces, due to which boiling point of compound increases. the same compound having least solubility is due to lyophilic/Hydrophobic ( tendency to get dissolved in non aqueous solution) increases & solubility of compound in polar solvents decreases.
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1 start with 25°C and a volume of 10.0L. If I increase the volume to 15.0L, what is my new temperature? (Equation that is helpful: K= 273 + "C)
Answer:
If in volume of 10.0L it is 25°C than it will be 37.5C volume in the new temperature if increased from 10.0L to 15.0L
Explanation:
10.0L=25°C
15.0L=?
10×2.5= 25
15×2.5=37.5
Kelvin(K)= C+273=T
=37.5+275=312.5
=C=312.5-275
=C=37.5
(Help!) What is the mass of hydrogen atoms that is measured at 72 u?
Answer:
=71.439911 u
Explanation:
We know that 1 mass of hydrogen atom = 1.00784 u
If it's measured at 72u: 72/1.00784=71.439911 u
Mass of 1 mol hydrogen atoms =1.00784u
Total mass in 72u
72/1.0078471.43uMechanism of cell destruction of Poison oak
Sally fell off of her bike and scraped her knee. What cellular process would aid in the healing of her scrape? Group of answer choices meiosis mitosis
Answer:
Mitosis
Explanation:
you scrape your knee and the skin repairs itself
What is the expansion for the chemical symbol of tungsten?.
let's say these four solutions have the same concentration, which one has the highest freezing point?
Answer:
What are those for solution be specific
Fill in the blank with the correct response.
————— surveys are measurement tools that use a series of questions to obtain data from respondents.
Surveys are the data collection tool and research methods. The questionnaire survey tool is used to collect the data based on questions.
What are questionnaires?Questionnaires are the tool used for the research and the data collection for the analysis, investigation, and conclusion. It is one of the data collection tools that comprises questions and prompts.
Questionnaires are the part of surveys that gathers information on the topic of the research and is easy to analyze and cost-effective. It is a valuable tool that collects data from a large number of participants.
Therefore, the correct blank is the questionnaire.
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All stoichiometry calculations involve what important step?
metric fraction
molar mass fraction
molecules fraction
mole ratio fraction
DONE
Answer:
Mole Ratio Fraction
Explanation:
That's the answer.......
Answer:
DExplanation:
Mole Ratio Fraction
A scientist finds a fossil that she thinks might make a good index fossil.
Which characteristic does this fossil most likely have?
Answer: A fossil will usually have remains or impressions of an animal or plant.
Answer:
the answer is b
Explanation:
trust me
Do you like the eye color black or blue better?
Answer:
black.
Explanation:
I like seeing myslef, so therefore with black eyes I would be seeing my reflection
Identify the molecular shape of each lewis structure. bent tetrahedral trigonal planar trigonal pyramidal
Identify the molecular shape of each lewis structure we have that:
1. Trigonal pyramidal
2. Tetrahedral
3. Trigonal planar
4. Bent
What is Lewis structure?For an understanding through pictures of the location of electrons in an atom, we represent electrons as dots around the element symbol. The number of electrons available for bonding is indicated by unpaired dots. These symbols are called Lewis symbols.
The Lewis structure shows the formation of bonds in a molecule, as well as the atoms involved and the valence electrons of each of them, in this case was Trigonal pyramidal; Tetrahedral; Trigonal planar; Bent.
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a solution contains 2 moles of hydrochloric acid.the volume of the solution is 250 cm3
what is its concentration in mol/dm³
Answer:
1dm = 10cm
1dm3 = 10cm x 10cm x 10cm = 1000cm3
1L = 1000cm3
so 1litre = 1dm3
4 moles in 2 dm3
= 2 moles in 1dm3 = 2moles in 1L = 2M
1L = 1000cm
0.3 moles in 200cm3 =
200cm3 = 0.2L
so 0.3 moles in 0.2 L = 1.5 moles in 1 L = 1.5M
(I have tried to simplify and show why 1dm3 = 1L)
I hope this helps you understand!
Fe2O3 (s) + 3CO (g) -----> 2Fe (l) + 3CO2 (g)
How many moles of Fe2O3 must react to produce 760 kg of Fe? (please tell me how you get the answer...)
The number of moles of Fe₂O₃ that must react to produce 760 kg of Fe are 20.503
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
The reaction is [tex]\rm Fe_2O_3 (s) + 3CO (g) ----- > 2Fe (l) + 3CO_2[/tex]
The mass of Fe is given 760 kg
The molar mass of Fe is 55.9 g/mol
To calculate the number of moles
[tex]n = \dfrac{m}{M} \\\\n = \dfrac{760000}{55.9 g/mol} = 13,669[/tex]
Now, the ratio between Fe and O is 2 : 3
[tex]\dfrac{13,669}{2} \times 3 = 20,503.5[/tex]
convert it into kg = 20.503 mol
Thus, the moles are 20.503 mol
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Energy can come in many different forms such as mechanical energy, sound energy, electromagnetic energy, thermal energy, chemical energy, and nuclear energy.
15 Energy is measured in units called __________
Answer:
Explanation:
Energy can come in many different forms such as mechanical energy, sound energy, electromagnetic energy, thermal energy, chemical energy, and nuclear energy.
15 Energy is measured in units called __________
What will the pressure be if 89.9 moles of argon are contained in a 12.0 L cylinder that is pressurized at a temperature of 300 K?
Done!
Ne double-replacement reaction of iron(ii) nitrate with potassium
ydroxide produces a precipitate of iron(iii) hydroxide.
fe(no3)3(aq) +3koh(aq) +3kno3(aq) + fe(oh)3(s)
that mass of iron(iii) hydroxide is produced when 50.0 g iron(iii)
itrate reacts with excess potassium hydroxide?
a 7.36 g fe(oh)3
w
b 22.1 g fe(oh)3
g
3
c 66.3 g fe(oh)3
d 50.0 g fe(oh)3
check it
skip
The mass of iron (III) oxide that will be produced would be 22.1 grams
Stoichiometric calculationFrom the equation of the reaction:
[tex]3KOH + Fe(NO_3)_3 --- > 3KNO_3 + Fe(OH)_3[/tex]
The mole ratio of iron (III) nitrate to iron (III) hydroxide is 1:1.
Mole of 50 g iron (III) nitrate = 50/241.86 = 0.207 moles
Equivalent mole of iron (III) hydroxide = 0.207 moles
Mass of 0.207 moles iron (III) hydroxide = 0.207 x 106.87 = 22.1 grams
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Which of the following is the best hypothesis?
OA. Physical changes are much less interesting to watch than
chemical changes.
B. If sodium carbonate is added to vinegar, the reaction will absorb
heat.
C. Tearing a piece of paper is an example of a physical change.
D. Some chemical reactions absorb heat, and others release heat.
SUBMIT
Help me y’all
Answer:
B.) If sodium carbonate is added to vinegar, the reaction will absorb heat.
Explanation:
A.) is incorrect because this is not testable. Rather, it is just an opinion that cannot be proven correct or incorrect.
B.) is correct because this statement is testable. Tests need to be run to determine the accuracy of the statement.
C.) is incorrect because this statement explains something that does not need to be tested. It is an example of a physical change when one tears a piece of paper.
D.) is incorrect because this is already a true statement. It is obvious that not all reactions absorb/release heat. While tests could be run to further prove this statement true, it is already considered accurate.
Convert 65 grams of oxygen to moles
65 grams of oxygen is approximately equal to 2.03125 moles.
To convert 65 grams of oxygen to moles, we need to use the molar mass of oxygen (O₂), which is approximately 32.00 g/mol. Oxygen exists as a diatomic molecule (O₂), so we use the molar mass of O₂ to convert from grams to moles.
The formula for converting grams to moles is:
Moles = Mass (in grams) / Molar mass (in grams per mole)
Given:
Mass of oxygen = 65 grams
Molar mass of oxygen (O₂) = 32.00 g/mol
Moles of oxygen = 65 grams / 32.00 g/mol
Moles of oxygen ≈ 2.03125 moles
Therefore, 65 grams of oxygen is approximately equal to 2.03125 moles.
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20 Infer Check the box to show which would tell you for sure if you had a sample of real gold.
Color of your sample. Yes No
What happens when you strike your sample with a hammer.
The location where your sample was found.
Answer:
C but read the limitation
Explanation:
Gold sample
Color wouldn't tell you much. In fact it may fool you. Fool's Gold is the same color as gold.
Gold is very malleable. That's what hitting gold with a hammer will do. It tends to shape the gold without destroying it into lots of pieces. A lot of yellow things have that property.
If only it was that simply. Yes if you are sure there is gold in that location. You have to pick this answer, because the other 2 don't work. So this is possible, but not the best way. The best way is to subject the sample to chemical treatment. If you are left with a yellow sample, then you could make the case for it being gold.
what is the volume of 15.0 g of ice
A. 7.5
B. 13.8
C. 15.0
D. 16.3
When we convert 15 g of ice to volume in milliliters (mL), the result obtained is 15 mL (option C)
Conversion scale1 g = 1 mL
How to convert 15 g to mL1 g is equivalent to 1 mL.
Therefore,
15 g will also be equivalent to 15 mL
Thus,
15 g = 15 mL
The correct answer to the question is 15 (Option C)
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Scientists hypothesize that Earth's first oceans were made of fresh water. How did oceans obtain fresh water?
Answer:
The oceans obtained freshwater from glaciers melting. The freshwater was then trapped into small places below waves, which could be a reason why there is not much freshwater in the world.
At which temperature does water have particles with a greater average kinetic energy than water with a temperature of 30°C?
77°F
95°F
280K
300K
Answer:
95F
Explanation:
First we convert these temperatures into °C:
77°F = 25°C
95°F = 35°C
280K = 6.85°C
300K = 26.85°C
When temperature increases, water molecules have a greater average kinetic energy ans are more likely to collide with each other.
Out of the 4 temperatures, only 95°F (35°C) is of a higher temperature than 30°C. Hence 95°F is the answer.
3. fill in: name the organelle or organelles that perform each of the following functions. a. _____________________ convert sunlight to chemical energy. b. the _____________________ and the _____________________ help to support the plant cell and help it to maintain its shape. c. _____________________ store food or pigments. d. the _____________________ converts food into energy. it is found in both plant cells and animal cells.
Organelles are the components of the cells with various functions and roles. The correct blanks are chloroplast, cell wall and vacuole, vacuoles, and mitochondria.
What are the organelles?The organelles are the cell components that have well-defined structures and functions to perform the designated task in the cell activity. Chloroplast is the organelle that converts solar energy into chemical energy through photosynthesis.
The cell wall and the vacuoles provide the structural framework and shape of the cell. The vacuoles also store food pigments in the cell. The mitochondria of the cell convert the food source into energy like ATP.
Therefore, the correct blanks are chloroplast, cell wall and vacuole, vacuoles, and mitochondria.
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