Answer:
1- charge
Explanation:
Which of the following examples of energy can be both Potential Energy and Kinetic Energy?
O Electromagnetic Energy
O Chemical Energy
O Nuclear Energy
O Mechanical Energy
Which of the following phase changes occur at point B on the phase diagram below? Choose all that apply.
Condensation
Melting
Boiling
Sublimation
Pls find my answer bellow
Is NaCI a compound, atom, molecule, or element?
Answer:
Compound.
Explanation:
NaCl, or sodium chloride, is an ionic compound that is formed from the element Sodium (Na) and Chlorine (Cl). It is commonly known as salt.
if two liquids are completely .........., no interfacial tension exists between theme
a. Immiscible b. soluble c. acidic d.miscible
Answer:
d.miscible
Explanation:
If two liquids are completely miscible, no interfacial tension exists between them.
Interfacial tension is the force of attraction between between the molecules of a fluid that are in contact. This tension forms thick skin at the interface.
In miscible liquids, in which one liquid completely dissolves in another, there is no interfacial tension.
Interfacial tension does not allow miscibility of fluids as the tension between the interface is too great.
When there is a condition of no interfacial tension, two liquids are miscible. When there is immiscibility, interfacial tension exists between two fluids and this invalidates option A.So, if two liquids are miscible, there is no interfacial tension between them.
Which phase of matter is distinguished by a superheated gas that emits light?
crystalline solid
amorphous solid
gas
plasma
Answer:
I think it is Plasma
Explanation:
Which ecosystem would be least affected? I already know its a or b but i dont know which one help me and ill give a high points
Answer:
the answer is a . trust me
In the movie, "Raiders of the Lost Ark", Indiana Jones takes a gold idol from a cave. The statue is resting on a table which is rigged with a weight sensor. The weight sensor can detect when the weight is removed and will set off a series of unfortunate accidents. To prevent this from happening, Indiana replaces the gold idol with a bag of sand. The volume of the gold idol is approximately 1.0 L. The density of gold is 19.3 g/mL and the density of sand is 2.3 g/mL.
Complete question is;
In the movie, "Raiders of the Lost Ark", Indiana Jones takes a gold idol from a cave. The statue is resting on a table which is rigged with a weight sensor. The weight sensor can detect when the weight is removed and will set off a series of unfortunate accidents. To prevent this from happening, Indiana replaces the gold idol with a bag of sand. The volume of the gold idol is approximately 1.0 L. The density of gold is 19.3 g/mL and the density of sand is 2.3 g/mL.
A) Assuming the idol is pure gold, what volume would the bag of sand have to be in order to weigh exactly the same as the idol and not set off the boo by-traps?
B) Let’s assume that Indiana is successful in removing the idol and returning with it to his laboratory. He decides to determine if it is really pure gold. He weighs the idol and measures the volume by a water displacement method. The results are: mass = 16.5 kg and volume of water displaced = 954 mL. Is the idol made of pure gold? Explain your answer based on the experimental results.
Answer:
A) Volume of sand = 8.391 L
B) The idol is not made of pure Gold.
Explanation:
A) We are given:
volume of the gold idol = 1 L = 1000 mL
Density of gold = 19.3 g/mL
Density of sand = 2.3 g/mL
So; mass of gold is gotten from the equation;
Density = mass/volume
Mass = density × volume
Mass of gold = 19.3 × 1000 = 19300 g
Now, we want to find what volume would the bag of sand have to be in order to weigh exactly the same as the idol.
Thus, volume of sand = 19300g/23 g/mL = 8391 mL or 8.391 L
B) We are now told the gold idol has;
mass = 16.5 kg = 16500 g
volume of water displaced = 954 mL.
Thus;
Density = 16500/954 = 17.3 g/mL
Now this value of 17.3 g/mL is lesser than that of pure gold given as 19.3 g/mL, it implies that the idol is not made of pure gold.
Determine the mass of the gold statue using its volume and density.
[tex]\to density = \frac{mass}{volume} \\ or \\ \to mass = density \times volume[/tex]
Converting the statue's volume from L to mL so that the volume unit and density unit correspond.
Calculating the mass of the statue:
[tex]\to 19.3\ \frac{g}{mL} \times 1000\ mL = 19,300\ g\\\\[/tex]
The weight of the sand must be the same as the weight of the statue, which is [tex]19,300\ g\\\\[/tex]
Calculate the volume of sand required using the mass and density of the sand.
[tex]\to density = \frac{mass}{volume} \\ or \\ \to mass = density \times volume[/tex]
Calculating the volume of required sand:
[tex]\to \frac{19,300\ g}{23 \ \frac{g}{mL}} = 8391\ mL \ or\ 8.391\ L[/tex]
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please help me it’s due today
Answer:
Opinion A is the right answerAnswer:
it's A
Hope this helps
amnabsbshdbxbsbsj
How can mass effect the volume of a solid??
What is Group 18 on the Periodic Table called?
A. Alkali Metals
B. Halogens
C. Noble Gases
Answer:
C
Explanation:
Noble gas or inert gas
Answer: C: Noble Gas
Hope this helps :)
Choose one or more:
A. Electrons exhibit interference or diffraction due to scattering objects or apertures around the same size as their de Broglie wavelength.
B. Electrons don't collapse into the nucleus because they form standing waves of discrete modes of vibration.
C. Electrons exhibit a discrete charge.
D. Electrons may tunnel through barriers of nanometer or below thickness.
E. Electrons exhibit a discrete mass.
Answer:Electrons exhibit interference or diffraction due to scattering objects or apertures around the same size as their de Broglie wavelength. Electrons exhibit a discrete charge. Electrons exhibit a discrete mass. Electrons may tunnel through barriers of nanometer or below thickness
Explanation:
Electrons behave both as matter an waves in accordance with De Broglie principle of wave particle duality hence they possess an associated wavelength and as such undergo diffraction and interference.
Electrons have a known magnitude of mass and charge.
Many studies have also shown that electrons can tunnel through barriers of 1nm thickness or less.
(picture of question included below)
Determine whether each description applies to electrophilic aromatic substitution or nucleophilic aromatic substitution.
a. The position of the added group is mostly determined by electronics.
b. The aromatic ring is the electrophile and the added group is the nucleophile.
c. The position of the added group is mostly determined by the location of a leaving group.
d. Electron donating groups on the aromatic group increase reactivity.
e. Electron withdrawing groups on the aromatic group increase reactivity.
f. The aromatic ring is the nucleophile and the added group is the electrophile. Choose...
Answer:
a. electrophilic aromatic substitution
b. nucleophilic aromatic substitution
c. nucleophilic aromatic substitution
d. electrophilic aromatic substitution
e. nucleophilic aromatic substitution
f. electrophilic aromatic substitution
Explanation:
Electrophilic aromatic substitution is a type of chemical reaction where a hydrogen atom or a functional group that is attached to the aromatic ring is replaced by an electrophile. Electrophilic aromatic substitutions can be classified into five classes: 1-Halogenation: is the replacement of one or more hydrogen (H) atoms in an organic compound by a halogen such as, for example, bromine (bromination), chlorine (chlorination), etc; 2- Nitration: the replacement of H with a nitrate group (NO2); 3-Sulfonation: the replacement of H with a bisulfite (SO3H); 4-Friedel-CraftsAlkylation: the replacement of H with an alkyl group (R), and 5-Friedel-Crafts Acylation: the replacement of H with an acyl group (RCO). For example, the Benzene undergoes electrophilic substitution to produce a wide range of chemical compounds (chlorobenzene, nitrobenzene, benzene sulfonic acid, etc).
A nucleophilic aromatic substitution is a type of chemical reaction where an electron-rich nucleophile displaces a leaving group (for example, a halide on the aromatic ring). There are six types of nucleophilic substitution mechanisms: 1-the SNAr (addition-elimination) mechanism, whose name is due to the Hughes-Ingold symbol ''SN' and a unimolecular mechanism; 2-the SN1 reaction that produces diazonium salts 3-the benzyne mechanism that produce highly reactive species (including benzyne) derived from the aromatic ring by the replacement of two substituents; 4-the free radical SRN1 mechanism where a substituent on the aromatic ring is displaced by a nucleophile with the formation of intermediary free radical species; 5-the ANRORC (Addition of the Nucleophile, Ring Opening, and Ring Closure) mechanism, involved in reactions of metal amide nucleophiles and substituted pyrimidines; and 6-the Vicarious nucleophilic substitution, where a nucleophile displaces an H atom on the aromatic ring but without leaving groups (such as, for example, halogen substituents).
A balloon contains 25.0 grams helium (He) gas at room temperature (22 °C) and occupies a volume
of 75.0 L. How much pressure does the He gas exert on the walls of the balloon?
Answer:
The pressure exerted by He on walls of balloon is 2.02 atm.
Explanation:
Given data:
Mass of helium = 25.0 g
Temperature = 22°C
Volume of gas = 75.0 L
Pressure exert by the gas on walls of balloon = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
22+273 = 295 K
Now we will calculate the number of moles of He.
Number of moles = mass/ molar mass
Number of moles = 25 g/ 4 g/mol
Number of moles = 6.25 mol
Now we will put the values in formula.
P × 75.0 L = 6.25 mol × 0.0821 atm.L/mol.K ×295 K
P × 75.0 L = 151.372 atm.L
P = 151.372 atm.L / 75.0 L
P = 2.02 atm
The pressure exerted by He on walls of balloon is 2.02 atm.
Give the shorthand notation for Aluminum:
Answer:
Al
Explanation:
Aluminum, the 13th element on the Periodic Table, is a Post-Transition metal.
How many centimeters is 4.25 yards equal to?
Answer:
388.62
Explanation:
well you convert yards into feet and feet into inches and inches into centimeters
A chemical change is the change in _____ substance
Explanation:
A chemical change is the change in liquid substance
Hope it will help you
which list of elements consists of a metal, a metalloid, and a nonmetal?
Answer:
Sn, Si, C
Explanation:
The periodic table consists of metals, non-metals and non-metalloids. The classification of the elements is mainly based on the chemical properties which are common among them. Here the correct option is A.
What are metals, non-metals and metalloids?The elements which tend to lose electrons easily and are located on the left side of the periodic table are called metals. They are good conductors of heat and electricity. All metals are malleable, ductile and shows metallic lustre.
The elements which tend to gain electrons and are placed on the right side of the periodic table are called non-metals. Most of them are brittle and are not malleable or ductile. They have low melting and boiling points.
The elements which exhibit the properties of metals and non-metals are called metalloids. These elements are placed diagonally across the periodic table. They form alloys with metals.
Here among the given list of elements, Na, Si and O consists of metal, non-metal and metalloid.
Thus the correct option is A.
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Your question is incomplete, but most probably your full question was
which list of elements consists of a metal, a metalloid, and a nonmetal?
A. Na, Si, O
B. Ge, Si, Cl
C. He, N, F
D. None of the above
How many significant figures does the following number have?
60002
What is the density of a box with a mass of 300 g and a volume of 10 mL?
Answer:
300g/mL^3
Explanation:
300 grams divided by 10 mL equals 30g/mL^3, apologies if I'm incorrect.
How much is a share in namsek worth as a percent of a share in oxd group
Answer:
10% is a share in NAMSEK worth as a percentage of a share in ODX Group Inc., in year 4
EXPLANATION: give brainliestThe share of NAMSEK in year 4 is around $ shares (as given from the above table). Hence the value of one share will be $2.5/share
The share of ODX Group Inc., in year 4 is around $ shares (as given from the above table). Hence the value of one share is $
Therefore a share in NAMSEK worth as a percentage of a share in ODX Group Inc., in year 4 will be
= 0.1 or 10 %
The spongy layer of a leaf
HELLPROPRPTPR
What is thermodynamics?
A. The study of the conservation of matter and energy
B. The study of the movement of energy and heat
C. The study of kinetic energy and potential energy
D. The study of the transfer of hot and cold energy
Answer:
The answer to your question is B
Thermodynamics is the study of science that deals with the relation and movement of heat, work, temperature, and energy. Thus, option B is correct.
What are the laws of thermodynamics?Thermodynamics is the science that deals with the relation and the flow of heat and energy concerning entropy and enthalpy of matter. According to the laws of thermodynamics, the energy or the heat of the substances or the system cannot be formed through new reactions nor they can be destroyed.
The second law states about the spontaneous and non-spontaneous reactions and their relation to entropy and enthalpy of the reaction. In the third law, for a pure substance, the entropy reaches zero with the temperature also approaching zero.
Therefore, thermodynamics deals with the flow of heat and energy.
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What is the average density of the cobalt?
Answer:
8.86 grams per cubic centimeter
Density: 8.86 grams per cubic centimeter
Explanation:
Q4 A 0.2027 gram sample of finely powdered limestone (mainly CaCOs) was
dissolved in 50 mL of 0.1035 M HCl. The solution was heated to expel CO2
produced by the reaction. The remaining HCI was then titrated with 0.1018M of
NaOH and it required 16.62 mL. Calculate the percentage of CaCO, in the
limestone sample?
CaCO, + 2HCI —— CaCl2 + CO2 + H2O
Answer:
85.9%
Explanation:
There are two reactions to take into consideration for this problem:
The first one is the reaction of limestone with HCl:
1) CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
While the second one is the titration of HCL with NaOH:
2) HCl + NaOH → H₂O + NaCl
So first we calculate the number of HCl moles added:
50 mL ⇒ 0.050 L0.050 L * 0.1035 M = 5.175x10⁻³ moles HClA number of those 5.175x10⁻³ moles reacted with limestone while the remaining excess reacted with NaOH.
The number of NaOH moles used in the titration is:
0.01662 L * 0.1018 M = 1.692x10⁻³ mol NaOHWe know from equation 2) that the moles of NaOH are equal to the moles of HCl in the titration process.
That means that the number of HCl moles that reacted with CaCO₃ in the limestone sample is:
5.175x10⁻³ moles HCl - 1.692x10⁻³ mol HCl = 3.483x10⁻³ mol HClNow we use that number of HCl in equation 1) to calculate the number of CaCO₃ moles, which we then convert to grams using its molecular weight:
3.483x10⁻³ mol HCl * [tex]\frac{1molCaCO_{3}}{2molHCl}[/tex] * 100 g/mol = 0.1741 g CaCO₃.Finally we calculate the CaCO₃ percentage in the sample:
0.1741 g / 0.2027 g * 100% = 85.9%When solving a problem it is important to identify your given and needed units, but it is also important to understand the relationship between those units so you will know how to set up your equation in order to solve the problem. Review the data sets below and use the steps of the problem-solving method to determine whether the given measurements would be appropriate for calculating mass, volume, or density.
a. 432 g of table salt occupies 20.0 cm^3 of space
b. 5.00 g 0T balsa wood, density of balsa wood : 0.16 g/cm^3
c. 32 cm^3 sample of gold density of gold 19.3 =g/cm^3
d. 150 g of iron, density of Iron = 79.0 g/cm^3
Answer:
See Explanation
Explanation:
Given
(a) to (d)
Required
Determine whether the given parameters can calculate the required parameter
To calculate either Density, Mass or Volume, we have
[tex]Density = \frac{Mass}{Volume}[/tex]
[tex]Mass = Density * Volume[/tex]
[tex]Volume = \frac{Mass}{Density}[/tex]
(a) 432 g of table salt occupies 20.0 cm^3 of space
Here, we have:
[tex]Mass = 432g[/tex]
[tex]Volume = 20.0cm^3[/tex]
The above can be used to calculate Density as follows;
[tex]Density = \frac{Mass}{Volume}[/tex]
[tex]Density = \frac{432g}{20.0cm^3}[/tex]
[tex]Density = 21.6g/cm^3[/tex]
(b) 5.00 g of balsa wood, density of balsa wood : 0.16 g/cm^3
Here, we have:
[tex]Mass = 5.00g[/tex]
[tex]Density = 0.16g/cm^3[/tex]
This can be used to solve for Volume as follows:
[tex]Volume = \frac{Mass}{Density}[/tex]
[tex]Volume = \frac{5.00g}{0.16g/cm^3}[/tex]
[tex]Volume = 31.25cm^3[/tex]
(c) 32 cm^3 sample of gold density of 19.3 g/cm^3
Here, we have:
[tex]Volume = 32cm^3[/tex]
[tex]Density = 19.3g/cm^3[/tex]
This can be used to calculate Mass as follows:
[tex]Mass = Density * Volume[/tex]
[tex]Mass = 32cm^3 * 19.3g/cm^3[/tex]
[tex]Mass = 617.6g[/tex]
(d) 150 g of iron, density of Iron = 79.0 g/cm^3
Here, we have
[tex]Mass = 150g[/tex]
[tex]Density = 79.0g/cm^3[/tex]
This can be used to calculate volume as follows:
[tex]Volume = \frac{Mass}{Density}[/tex]
[tex]Volume = \frac{150g}{79.0g/cm^3}[/tex]
[tex]Volume = 1.90 cm^3[/tex] Approximated
which element has the largest atomic radius?
(please look at the image. Also if you are correct I will mark the BRAINLIEST!!!)
Answer:
(Ba) balium
hope this helped.. :^)
Answer:
it's Ba which is balium
Explanation:
I hope I helped.. :^)
please i need help it is science
Answer:
Explanation:
its geocentric, retrograde, faster
Examine the layers of rock. Identify and explain which layer contains the oldest fossils? Earth layers with fossiles in each labeled top to bottom A to D.
I need a paragraph
Answer:The answer is D i got this answer because, the oldest layers are at te bottom and the youngest layers are on the top.
hope this answer heps!
Which two of the following groups are very reactive?
A. Alkali Metals
B. Halogens
C. Noble Gases
Answer:
A & B
Explanation:
Noble Gases are the least reactive as they have a full valence shell (and are stable)
