Answers
[tex]2032533 \sq22222rt[2]{?} [/tex]
Related Questions
3. Calculate the number of moles and mass in
gram_of_1 x 10^20mdecules of Nz gas
.
Answers
Answer:
0.17×10⁻³ mol
Mass = 0.00476 g
Explanation:
Given data:
Number of molecules of N₂ = 1 ×10²⁰ molecules
Number of moles of N₂ = ?
Mass in gram of N₂ = ?
Solution:
1 mole of any substance contain 6.022×10²³ molecules
1 ×10²⁰ molecules× 1 mol /6.022×10²³ molecules
0.17×10⁻³ mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.17×10⁻³ mol × 28 g/mol
Mass = 4.76×10⁻³ g
Mass = 0.00476 g
When force are ____ the object does not move
Answers
when forces are balanced the object does not move.
Explanation:
if you and your friend push both sides of the chair at the same time with the same amount of strength the chair wouldn't move.
An allotrope of carbon that is structured in a sphere is called:
A. fullerene
B. tetrahedron
C. graphite
D. diamond
Answers
Answer:
fullerene
Explanation:
Do you think it would be a good idea for a bumper car ride to have minimum and maximum weight requirements for riders? Apply Newton's second and third laws of motion in your response.
Answers
Answer: If only max or min yes but if we have min and max that is a bad idea it is not as safe.
Please select the word from the list that best fits the definition
Measured in grams of solute per gram of solution
concentration
solubility
Answers
Answer:
Solubility
Explanation:
Solubility units that incorporate units of solution include grams of solute per 100 grams of solution or grams of solute per liter of solution. Another way to express solubility is in moles of solute per liter of solution; this ratio is called "molarity."
why is a frozen popsicle a homogeneous mixture and not a pure substance
Answers
Answer:
You can not see the sugar.
Explanation:
The oxidation # (charge) of an element called "lindenium "Ld is + 1 and the oxidation # (charge) of an element called "mendezine symbol "Mz, is -2. What is the chemical formula for the compound called lindenium mendezide?
Answers
Answer:
Ld₂Mz
General Formulas and Concepts:
Chemistry - Compounds
Valence shellsWriting chemical compoundsBalancing chargesExplanation:
Step 1: Define
"Lindenium" Ld w/ oxidation charge of +1
"Mendezine" Mz w/ oxidation charge of -2
Step 2: Write Compound
To balance out the charges to be neutral (0), we must counter balance the amount of Ld's with Mz's. We need 2 Ld's with 1 Mz to create a compound with a neutral charge:
2Ld¹⁺ + Mz²⁻
2(+1) + (-2) = (+2) + (-2) = 0 (neutral charge)
Therefore, our compound must be Ld₂Mz.
what is the molar mass of nickel (ll) chloride(NiCl2)
Answers
Answer:
Explanation:
yt
Answer:
129.5994 g/mol
Explanation:
7. Base your answer to the following question on the information below and on your knowledge of biology A student designed an experiment to investigate a claim that athletes would have lower heart rates than nonathletes during exercise. After the students classified themselves as an athlete or a nonathlete, their resting pulses were determined. Then all the students performed the same exercise for four minutes and their heart rates were determined by recording the pulse rate in beats per minute. The students continued to measure their pulse rates for an additional four minutes. The average heart rate per minute for each group was determined. The data were recorded, as shown on the table below Average Heart Rate Response to Exercise (beats per minute) Time (minutes) Athlete Students Nonathlete Students Resting Pulse 68 72 1 76 78 2 82 90 Exercising Period 3 115 95 110 4 130 5 100 125 6 95 120 After Exercise 7 85 100 8 68 95 2.4 To improve the validity of the conclusion reached in this experiment, the students should repeat the experiment A) disregarding any data that don't fit the hypothesis B) with a larger number of athletes and nonathletes C) comparing the heart rates and breathing rates of males and females D) with the athletes doing different exercises than the nonathletes
Answers
How much radium-226 will remain from a 20 gram sample after 4800 years?
Answers
Answer:
2.5 g mass of Ra-226 will remain after 4800 years.
Explanation:
Given data:
Mass of Ra-226 = 20 g
Sample remain after 4800 years = ?
Solution:
Half life of Ra-226 = 1600 years
Number of half lives passed = T elapsed / half life
Number of half lives passed = 4800 year / 1600 year
Number of half lives passed = 3
At time zero = 20 g
At first half life = 20 g/2 = 10 g
At 2nd half life = 10 g/2 = 5 g
At 3rd half life = 5 g/2 = 2.5 g
Thus, 2.5 g mass of Ra-226 will remain after 4800 years.
Which is the vector quantity that describes the shortest path between two points?
Answers
The shortest distance taken by the object to reach the destination at a minimum time is called acceleration. Thus value acceleration depends upon the displacement and time.
Use the periodic to fill in the numbers in the electron configurations shown below.
B: 1s2 2sA2pB
A =
2
B =
1
Na: 1s22sC2pD3sE
Answers
Answer:
B: 1s²2s²2p¹
Na: 1s²2s²2p⁶3s¹
Explanation:
A = 2
B = 1
C = 2
D = 6
E = 1
Hope that helps.
Answer:
B: 1s2 2sA2pB
A = 2
B = 1
Na: 1s22sC2pD3sE
C = 2
D = 6
E = 1
Margarita set up three vials on a hot plate. She poured the same amount of
liquid into each of the vials, and then she turned on the hot plate. Which event
could be a significant source of error in her experiment?
Answers
Answer: Since the vials are filled the same, and are placed on the same hot pad, all the water will evaporate at the same time
Explanation:
The source of error in the experiment is the vials being filled the same, and placed on the same hot pad, all the water evaporating at the same time .
What are errors?Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.
There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.
Errors while measuring boiling point may be human errors while noting down the boiling temperature or instrumental or systematic error if there is a fault in the thermometer.
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What is the relationship between the number of digits and the evolution of the tetrapod?
Answers
Answer:As the tetrapod evolved, the number of digits decreased
Explanation:
Answer: During the evolution of the tetrapod limb, the number and pattern of elements along the proximal–distal axis (running from the shoulder to the fingers) has remained invariant, while the number and pattern of elements along the autopod anterior–posterior axis (thumb to little finger, also designated digi
Explanation:
fountain
21. Calculate the quantity of electricity
in coulombs used when a current of
2.7 ampere is passed through a
solution of silver salt for 25 minutes
20 seconds
A. 87.5
B. 206
C. 1350
D. 4050
E. 4104
Answers
Answer:
4104 Coulombs
Explanation:
charge = time(sec) *current
25*60 =1500+20=1520
2.7A * 1520 sec =4104
4104 C
A gas has a volume of 1400 milliliters at a temperature of 20 K and a pressure of 760 mm Hg. What will be the
volume when the temperature is changed to 40 K and the pressure is changed to 380 mm Hg?
A. 350 mL
B. 750 mL
c. 1400 ml
D. 5600 mL
Answers
Answer: 1400 mL
Explanation:
The change in volume with change in pressure and change in temperature can be calculated using combination of gas laws. Here, the change in volume is 5600 ml.
What is combined gas laws?Boyle's law, Charles's law and Gay- Lussacs law all relating the temperature, pressure and volume of an ideal gas. The relation between these three parameters from the combination of these laws at conditions is written as:
P1 V1/T1 = P2 V2/ T2.
From this, the change in volume V2 can be calculated.
Given , P1 = 760 mmHg
T1 = 20 k and V1 = 1400 mL.
T2 = 40 k and P2 = 380 mmHg.
The new volume V2 = P1 V1 T2 / T1 P2.
= (760 mmHg × 1400 ml × 40K) / (20 K × 380 mmHg)
= 5600 mL.
Therefore, the change in volume of the gas is 5600 ml.
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How many grams of calcium are made up by 2.68 x 1023 atoms?
Answers
Answer:
Mass = 17.8 g
Explanation:
Given data:
Number of atoms of Ca = 2.68 × 10²³
Mass in gram = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.68 × 10²³ atoms × 1 mole /6.022 × 10²³ atoms
0.445 mol
Mass in gram;
Mass = number of moles × molar mass
Mass = 0.445 mol × 40 g/mol
Mass = 17.8 g
Is the sodium Nitrate solution acidic, basic , neutral? and why ?
Answers
Answer: Sodium Nitrate solution is neutral.
Explanation: Sodium nitrate solution has strong bases and strong acids so it would have a neutral pH of 7.
22.
An example of amphoteric oxide is
A. Al2O3.
B. CaO.
C. Cuo.
D. SiO2.
E. K20.
Fu** please help
Answers
Answer:
A (option) .............
Answer:
Al2O3
Explanation:
ZnO,Al2O3,PbO2 are some of the amphoteric oxides
Amphoteric oxides are metal oxides that can react with both acids and bases,so Aluminum oxide can react with both HCl and Sodium hydroxide which is a base
1. Solve for x
Atomic number 31
Atomic mass x
Number of protons y
Number of neutrons 33
Number of electrons 28
Charge of element z
Answers
Answer:
Atomic mass = proton + neutron
31+33= 64
Number of proton = Atomic number = 31
Charge of element is +3
Explanation:
Convert 76.8 cm to m.
Answers
Answer:
0.768 m
Explanation:
1 cm = 0.01 m
76.8 cm * 0.01 m/ 1 cm
0.768 m
write the metals and nonmetals and metalloids in the first 30 elements
Answers
Answer: Metals: Li, Be, Na, Mg, Al, K, Ca, Sc, Ti, V, Mn, Fe, Co, Ni, Cu, Zn
Non-metals: H, He, C, N, O, F, Ne, Si, P, S, Cl, Ar
Metalloid: B
Explanation: The first 30 elements are H, He, Li, Be, B, C, N, O, F, Ne, Na,
Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Mn, Fe, Co, Ni, Cu, Zn
Metallic elements are more electropositive (tending to form ions by donating electrons) with fewer electrons in their outer shell
Non-metallic elements are more electronegative (tending to form ions by accepting electrons) with more electrons in their outer shell
Metalloids are elements somewhere between, but without any specific clear boundary between them and metals/non-metals
group1 and group2 elements, with one or two outer electrons, are all metals: Li, Na, K, Be, Mg, Ca
similarly the transition metals 21-30 are all electropositive and metals.
The noble gases He, Ne, Ar are gases that have completed outer shells and are non-metallic, likewise the halogens F, Cl with 7 outer electrons, and O and S with 6 are non-metals. N and P (5 outer electrons) are non-metallic as are C and Si (4 outer electrons).
This leaves H, B, Al. H, with its single electron close to the nucleus is a non- metallic gas. Al (3 outer electrons) is metallic, but B, has its 3 electrons close to the nucleus and has the in-between character of a metalloid.
Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container?
Answers
Complete Question:
Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container?
Group of answer choices
A. A chemical change started immediately and finished at eight minutes.
B. A non-chemical change started immediately and finished at eight minutes.
C. A chemical change occurred at four minutes.
D. A non-chemical change occurred at four minutes.
Answer:
A. A chemical change started immediately and finished at eight minutes.
Explanation:
A chemical reaction can be defined as the chemical process which typically involves the reaction between two or more chemical elements (substances) to form a new compound, through the rearrangement of the ionic or molecular structure of each chemical element.
This ultimately implies that, a chemical reaction is a chemical change that immediately starts when two or more molecules of a chemical element (substance) known as reactants are combined together to form a new product (compound).
In this scenario, Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. Thus, what this represent about the type of change happening in the container is that, a chemical change (from red to blue) started immediately and finished at eight minutes.
Which has a higher frequency: microwaves or blue light? How do you know?
Answers
Answer:
Microwaves
Explanation:
Microwaves have more energy than blue light
Among microwaves or blue light, blue light has a higher frequency. This is because blue light belongs to the visible region has a short wavelength and produces a higher amount of energy.
What is the relationship between frequency and wavelength?The frequency of any wave is inversely related to the wavelength. This means that when the frequency of the wave increases, the wavelength decreases. While the relationship between frequency is directly related to the energy.
According to the context of this question, gamma rays have the highest frequency and shorter wavelength, while radiowaves have a shorter frequency and the highest wavelength.
Therefore, blue light has a higher frequency. This is because blue light belongs to the visible region has a short wavelength and produces a higher amount of energy.
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Why does the rate of dissolution for a gas decrease as the temperature of a solvent increases?
more space for the solute to escape
less space for the solute molecules
less space between solvent molecules
more collisions between solute and solvent molecules
Answers
Answer:
As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return back to the gas phase. As a result, the solubility of a gas decreases as the temperature increases.
Explanation:
Each organ system has specific functions for the body's survival. Which body system is responsible for carrying oxygen from the lungs to the body cells and transporting glucose for energy?
Group of answer choices
Answers
Answer:
Circulatory System
Explanation:
Blood carries oxygen to the rest of the body, as well as glucose.
a school bus drives 35 mph down the street and slows as it approaches the stop sign
Answers
Agl + Na25 yields Ag2S + Nal
Answers
Explanation:
Agl+hih+356bnh$&56DG hug zero cg hydh hod sir un bucks
Help needed: Which of the following is the correct name for N2S5?
A. Dinitrogen sulfide
B. Dinitride pentasulfur
C. Dinitrogen pentasulfide
D. Nitrogen sulfide
Answers
Answer:
dinitrogen pentasulfide
Explanation:
The correct name for the compound N₂S₅ is Dinitrogen pentasulfide and the correct option is option C.
Naming of compounds refers to the systematic process of assigning names to chemical compounds based on their composition and structure. It involves following certain rules and conventions to generate appropriate names that accurately represent the chemical formula and characteristics of the compound.
In inorganic chemistry, naming compounds often involves identifying the elements present and specifying their respective oxidation states or charges. Various naming conventions, such as the Stock system and the common system, are used depending on the type of compound and the specific elements involved.
Thus, the ideal selection is option C.
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helpppp:)))))))))ahhhh
Answers
Answer:
Calcium
Explanation: