Answer:
No. of moles = no. of given molecules/NA
No. of moles = 8.3 × 10^23 / 6.023 × 10^23
= 1.3780 moles
Explanation:
I need help in this question
Answer:
D) is the correct answer.
Explanation:
[tex]na2co3 - > na2o + co2[/tex]
Ionic bonds result from elements_____.
A. that form polar bonds
B. that share electrons
C. with high electronegativity differences
D. that are only nonmetals
Answer:
With high electronegativity differences
Explanation:
Ionic bond usually forms in between metals and non metalsIn solution they can contain electricityFor exam ple
NaCl,KCl,KBrWhat is the length of the shaded grey area? write your answer to the correct number of significant digits. The unit is cm
Answer:
1.37cm
Explanation:
It's less than 1.4cm but more than 1.3cm. It's also more than 1.35cm so I guess the best answer would be 1.37cm or round up to 1.4cm
Sugar turns into black mass on heating Give reason
need fast
The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot. hope this helps
Sugar is made of carbon, hydrogen, and oxygen atoms. When heated over a candle, these elements react with the fire to turn into a liquid. The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.
What is the difference between isopropyl alcohol and rubbing alcohol.
Answer:
The main difference between isopropyl alcohol and rubbing alcohol is the concentration. The concentration of isopropyl alcohol is 100%, while the concentration of rubbing alcohol is less because of the addition of water. Otherwise, the two liquids have similar properties.
Explanation:
Hope this helps
Describe in terms of atoms what happens when hydrogen and oxygen reacts to make water
Answer:
New covalent bonds form between oxygen atoms and hydrogen atoms.
Explanation:
For example, when hydrogen gas, H2(g), is burned in the presence of gaseous oxygen, O2(g), a new substance, liquid water, H2O(l ), forms. The covalent bonds within the H2 molecules and O2 molecules break, and new covalent bonds form between oxygen atoms and hydrogen atoms (Figure 7.1).
Increasing the concentration does what to the molecular
Answer:
With an increase in concentration, the number of atoms with the least required vitality will increase, and so the rate of the response will increase.
Explanation:
What else is produced during the replacement reaction of magnesium and hydrochloric acid? mg 2hcl h2 ________ mgcl2 mg2cl2 mg2cl mgcl
During the replacement reaction of magnesium and hydrochloric acid MgCl₂ is produced with hydrogen gas.
What is replacement reaction?Replacement reactions are those reactions in which one entity from the one of the reactant will replace by another entity for the formation of the product.
Balanced chemical reaction between magnesium and HCl will be represented as:
Mg²⁺ + 2HCl → MgCl₂ + H₂
In the baove reaction magnesium displaces hydrogen atom from the acid molecule.
Formation of Mg₂Cl₂ is impossible because valency of magnesium is not satisfied in this.Formation of Mg₂Cl is also impossible because valency of magnesium is not satisfied in this.Formation of MgCl is also impossible because valency of magnesium is not satisfied in this, as valency of Mg is +2 and of Cl is -1.Hence MgCl₂ is produced in the reaction.
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What is an example of electrical energy to heat energy? Question 3 options: Using a match to warm liquid Using a hotplate to boil water Growing plants in the window Mixing chemicals to produce heat
Answer:
using a hot plate to boil water
Explanation:
the others require a chemical reaction to produce heat
What are the conditions for STP?
Answer:
STP is Standard temperature and Pressure, which are o degrees C and 1.013 x 10^5 Pascals. At those values, one mole of any ideal gas occupies 22.41 litres.
Where are the sugars created during photosynthesis?
a. roots
b. stomata
c. chloroplasts
d. stem
Answer:
stroma part of chloroplast
Explanation:
Do you think three weeks (21 days) is enough time to observe all of the Moon’s phases? Why or why not?
Answer:
No, because the moon takes about 27 days to fully orbit which means that 3 weeks would not be enough to see all of the moon's phases, but if you think that you don't need 27 days due to the fact that some of the days there may not be a phase change then that is completely up to you.
Explanation:
Hope this helps:)...if not then sorry for wasting your time and may God bless you:)
How would you balance the following
reaction:
C4H10 + O₂ -> CO₂ + H₂O
Answer:
2 C4H10 + 13 O2 ====> 8 CO2 + 10 H2O
Explanation:
What is the molarity of a solution that contains 200. 0 g of lithium chloride in 450 mL? molar mass of chloride= 42. 394g/mol
Explanation:
Sol. 450 ml there is LiCl 200 g
Sol. 1000 ml there is LiCl 200/450×1000
= 444.44 g
Molar = g/molar mass = 444.44/42.394 = 10.48 M
If the bag was made from a metal (like sturdy aluminum foil), do you think it would lose its heat faster or slower than the plastic bags? Explain your reasoning
I think it would lose its heat faster than the plastic bags because of higher conductivity feature.
What is conduction?Conduction is the process in which heat or electricity is transmitted or transferred through the material of a substance without movement of the material.
We know that metals are good conductors so we can conclude that it would lose its heat faster than the plastic bags bof higher conductivity feature.
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which of the following is a reason to protect biodiversity?
Answer:
C. people rely on ecosystem services provided by intact ecosystems
Explanation:
:) Comment was correct! <3
Protecting and managing biodiversity resources is a crucial part of maintaining ecological harmony and ensuring the survival of species' future generations so that they can live long healthy lives. The correct option is C.
In order to stop the extinction of species, biodiversity should be protected. To keep nature in balance, it is conserved. Other organisms will suffer if one species in the food chain becomes extinct.
The systems that sustain all life on Earth, including humans, depend on biodiversity. We cannot have the healthy ecosystems that we depend on to give us the air we breathe and the food we consume without a diverse variety of animals, plants, and microorganisms.
Thus the correct option is C.
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#SPJ4
Adam observed properties of four different waves and recorded observations about the frequency and volume of each one in his chart. which statement could adam declare based on the data in the table? only the sound quality of waves y and z can be compared. the sound quality of all of the waves can be compared. the sound quality of waves w and x can be compared. the sound quality for these waves cannot be compared.
Adam observed properties of four different waves and the sound quality of all of the waves can be compared.
What are waves?Waves is the propagation system of any matter in the upside and downside direction from the mean position.
Quality of sound waves will be measured by using the decibel unit which gives idea about the intensity of the sound in terms of loudness. And intensity of the sound waves is also be calculated by using the frequency in the given table frequency and decibel unit of four waves are given.
So we are able to compare the sound quality of all given waves and image of table is attached below.
Hence the sound quality of all of the waves can be compared.
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Answer:
The Answer is B
Explanation:
Took it on Edge
11
What is the ionic charge for an ion with 12 p* and 10 e?
A 0
B +2
C -2
D +1
Answer:
+2
Explanation:
10 e will 'balance ' 10 p then there is two + charges leftover
True or false: I should write partial charges on any polar bond within a molecule, even if the molecule as a whole is nonpolar
The answer of this statement is false because partial charge occurs only on polar bonds.
How I put partial charge on molecule?I should write partial charges on any polar bond within a molecule, but not a molecule which whole is nonpolar because charge only occurs when the atom gains or loses electron.
So we can conclude that The answer of this statement is false because partial charge occurs only on polar bonds.
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A teacher is discussing several scenarios in the topic of gas law s. Which of the following scenarios will the initial pressure be equal to the final pressure
The scenario whereby the initial pressure is equal to the final pressure is : ( A ) A balloon filled with air is heated from 300k to 600k, causing it to expand and double in size.
Gay Lussac's lawGay Lussac's law states that at constant pressure, the volume of gas is directly proportional to the change in temperature. i.e. V ∝ T. From scenario 1 the change in temperature from 300 K to 600 K shows a 100% increase in temperature which corresponds with the expansion and size doubling of the volume of gas.
Hence we can conclude that The scenario whereby the initial pressure is equal to the final pressure is : ( A ) A balloon filled with air is heated from 300k to 600k, causing it to expand and double in size.
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9. Which compound is the least soluble at 20 °C?
Answer:
KCIO
Explanation:
Which of the following is the best description of a gaseous substance?
a. It has no shape of its own but has a definite volume.
b. It's the result of a chemical reaction involving two or more elements.
c. It holds its shape without outside restraint.
d. It has no definite shape or volume and will expand indefinitely.
correct answer - d (just took test)
Answer:
The answer is d.
"It has no definite shape or volume and will expand indefinitely."
Explanation:
Gaseous substances contain molecules that seriously want to move. These molecules take up any space that is free to the point where the substance will dissapate and lose its concentration. Aka, expand indefinitely.
How many grams of sulfur are required in the preparation of 35.7 moles of sulfur dioxide Sg + O2 SO2
Its balanced already
So
1 mol SO_2 require 1 mole sulphur35.7moles require 35.7mol sulphurMass of S
35.7(32)1142.4gwhy would copper slow down flow of electric charges
Answer: Heyo Kenji Here! Here's your answer- The electricity that is conducted through copper wires in your home consists of moving electrons. The protons and neutrons of the copper atoms do not move. The actual progression of the individual electrons in a given direction through the wire is quite slow.
Explanation: Hope this helps!
Have a nice day!
- Kenji ^^
Help. I need to finish this in time for school tomorrow
Pak Dollah who is long-sighted forgot to bring his glasses during breakfast in a restaurant. You are required to invent a lens to enable Pak Dollah to read the newspaper. Your invention must make use of the materials shown above.
Materials : Water Transparent plastic bottle and Water
A converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.
What is long-sightedness?Long-sightedness is an eye effect in which objects are not able to focus on the retina but behind the retina, therefore, near objects are not clearly seen except they are placed far away.
To correct long-sightedness, a suitable converging lens is used to bring the image to focus on the retina.
To construct a converging lens for Pak Dollah, the transparent plastic bottle is filled with water to serve as a converging lens and Pal Dollah will read through it.
Therefore, a converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.
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Hello people ~
Which of the following claims about crystal lattice diffraction patterns is correct?
a) Diffraction patterns possess a center of symmetry
b) Diffraction patterns doesn’t have center of symmetry
c) Diffraction patterns are linear space
d) Diffraction patterns contains α-rays
Answer:
a) Diffraction patterns possess a center of symmetry
Explanation:
They possess a center of symmetryDepending on this factor, they form patterns variablyCalculate the mass in grams of 3. 29 x 104 mol of lithium
Help please?
Answer
no. of moles =
[tex] \frac{mass \: {g} \: }{ \: molecular \: wight} [/tex]
so, mass (g)= no. of moles × molecular wight
Explanation:
Li molecular wight equal to 6.941
mass (g)=3.29×104 mol ×6.941 =2374.93g of lithium
Which substance has the lowest [h ] concentration but is still considered an acid? milk blood gastric fluid household lye
The substance which has H⁺ concentration but is still considered an acid is milk.
How concentration of H⁺ determine acidity?Acidity of any substance will be calculated by using the pH scale and pH is define as:
pH = -log[H⁺]
Among the given substances pH of them are in range of:
Milk: pH = 6.5 - 6.7Blood: pH = 7.35 = 7.40Gastric fluid: pH = 1.5 - 3.5Household lye: pH = 13.5pH scale ranges from 0 to 14, where 0 to 6.9 shows the acidity, 7 shows the neutrality and from 7.1 to 14 shows the basicity of the solution. From the given pH values it is clear that lye is highly basic and gastric fluid is highly acidic. And blood has slight basic nature and due to the presence of lactic acid milk has very low concentration of H⁺ ions and considered as acid.
Hence milk is the correct answer.
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Why are primary and secondary alcohols relatively easy to oxidize.
Answer:
The oxidation of organic compounds generally increases the number of bonds from carbon to oxygen, and it may decrease the number of bonds to hydrogen. Encyclopædia Britannica, Inc. Secondary alcohols are easily oxidized without breaking carbon-carbon bonds only as far as the ketone stage.
Explanation:
i hope it was helpful