Answer:
a. 0.2355052g
Explanation:
a)
1000ml of NaOH contain 0.241moles
24.43ml of NaOH contain (24.43*0.241)/1000 moles
= 0.00588763moles
Relative Molecular Mass of NaOH
= 1*23 + 1*16 + 1*1
= 40
1mole of NaOH weighs 40g
0.00588763moles weigh (0.00588763*40) g
= 0.2355052g
B)
NaOH -> Na+ + -OH
1 mole of NaOH dissociates to form 1 mole of -OH ions
1 mole of a substance contains 6.02*10^23 particles(atoms)
= 0.00588763 * 6.02 *10^23
= ______ions
the size of camphor kept in store house gradually decrease in size after few а days?
Answer:
Because it goes through the process of sublimation.
Explanation:
A compound contains 25.94%N and 74.06% O by mass whats the empirical formula
Answer:
the answer is NO or nitric oxide.
hope this helps, love. have a good day
Explanation:
Empirical formula is the simplest whole number ration of elements in a compound. Molecular formula is n times the empirical formula, where n is integers 1,2,... Therefore, the empirical formula is NO[tex]_2[/tex].
What is Empirical formula?Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.
The relation between molecular formula and empirical formula can be given as
n= molecular formula÷ empirical formula
Number of gram atoms in compound and divide by smallest Number of gram atoms in compound
N=(25.94%)÷14=1.85/1.85=1
O=( 74.06% )÷16=4.62/1.85=2
The atomic ratio is 1:2
Whole number N:O is1:2
Empirical formula corresponding to this whole number is NO[tex]_2[/tex].
Therefore, the empirical formula is NO[tex]_2[/tex].
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Consider the reaction where barium sulfate can be prepared from 2.76 mol of sodium sulfate and excess barium acetate. Sodium acetate is the other product
1.write the balanced MOLECULAR reaction.
2.write the balanced total ionic equation.
3.write the balanced net ionic equation.
Answer:
1. Na2SO4(aq)+C4H6BaO4(aq) --> BaSO4(s) + 2C2H3NaO2(aq)
2. 2Na^+1(aq) + SO4^-2(aq) + 4C^+4(aq) + 6H^+1(aq) + Ba^-2(aq) + 4O^-2(aq) --> BaSO4(s) + 2C^-4(aq) + 2H^+1(aq) + 3Na^+1(aq) + 2O^-2(aq)
3. Ba^+2(aq) + SO4^-2(aq) --> BaSO4(s)
Explanation:
what are the solar home lighting
Answer:
Sunlight
Explanation:
Home lighting System is powered by solar energy using solar cells that convert solar energy (sunlight) directly to electricity. The electricity is stored in batteries and used for the purpose of lighting whenever required
Which example accurately describes a solution? (1 point)
Nonpolar oil molecules dissolve in water, which is polar.
Polar sugar molecules dissolve in water, which is polar.
Nonpolar fat molecules dissolve in water, which is polar.
Polar sugar molecules dissolve in oil, which is nonpolar.
The example which accurately describes a solution is; Polar sugar molecules dissolve in water, which is polar.
According to the question:
We are required to determine Which example accurately describes a solution.The formation of a solution requires that the solvent and solute be of the same polarity.
In essence, the example which accurately describes a solution is; Polar sugar molecules dissolve in water, which is polar.
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Answer:
Polar sugar molecules dissolve in water, which is polar.
Explanation:
I did the Exam and got it right!
Hydrogen gas reacts with oxygen gas to form water. What is the excess reactant in this recation(Refer to the picture below to answer).
A. Water
B. Hydrogen gas
C. Oxygen gas
D. Water and oxygen gas
Answer: C. Oxygen Gas
Explanation: When Hydrogen Gas and Oxygen Gas combine together it forms water correct. When you have an excess amount of another it stays neutral because it has no other molecule to react with.
Determine the frequency of light with a wavelength of 2.672 x 10^-7cm
Answer:
Determine the frequency of light with a wavelength of 2.775⋅10−7 cm. Answer in units of Hz?❤
1.
How many moles of NaCl are in 1.5L of 0.25 M solution?
Answer:
0.375 moles
Explanation:
no of moles =vol×molarity
What is the molecular geometry if you have a double bond, a single bond and 1 lone pair around the central atom?
Answer:
4 pairs are needed for the bonds, leaving 1 lone pair. Each double bond uses 2 bond pairs and can be thought of as a single unit. There are 2 double bond units and 1 lone pair, which will try to get as far apart as possible - taking up a trigonal planar arrangement.
a meter is defined as 100. cm. How many significant digits are there in the value
Answer:
3 significant figure
Explanation:
Trailing zeros in a number are significant ONLY is the number contains a decimal point.
So if it was 100cm with out the decimal point would only have 1 significant figure.
Which of the following shows the valency of 1?
a) nitrogen
b) carbon
c) oxygen
d) sodium
[tex]\huge \bf༆ Answer ༄[/tex]
The element having valency of 1 is ~
Sodium (Na)Answer: Pretty sure this is d.) sodium
Explanation:
What is the percentage of nitrogen in ammonium chloride (NH4Cl)?
Answer:
25%
Explanation:
Ammonium Chloride NH4CI Fertilizer-grade NH4Cl usually contains 25% N. About two-thirds of the world capacity for manufacture of this material is located in Japan, with the remaining one-third situated in India and China.
How are prisms and raindrops alike?
They are both transparent.
They both reflect white light.
They are both translucent.
They both refract white light.
they both refract white light.
Answer:
They both reflect white light.
Explanation:
How raindrops and prism are similar?
Raindrops and prisms are similar because they both cause light to bend when it enters a prism or raindrop. When light enters a raindrop it causes the light to bend (refract) and separates the white lights into different wavelengths, allowing us to see the individual colors of the rainbow.
If you only wanted to increase the particle motion of a gas without increasing any of its other properties, which would the most correct situation?
a. Keep the gas at a constant pressure and keep the temperature constant, but increase the volume of the gas
b. Keep the gas in a fixed container at constant pressure and increase the temperature
c. Keep the gas in a fixed container at constant pressure and decrease the temperature
d. Keep the gas at a constant volume and keep the temperature constant, but decrease the pressure of the gas
Answer:
c
Explanation:
To calculate the atomic mass of an element, the percent
abundance of etch isotope is needed. ?
Answer:
List the known and unknown quantities and plan the problem. Change each percent abundance into decimal form by dividing by 100. Multiply this value by the atomic mass of that isotope. Add together for each isotope to get the average atomic mass
Explanation:
Revise the following statement to make it true:
All living things inside of an area are part of the population.
Answer:
All the individuals of a species living within a specific area are collectively called a population.
Explanation:
What kind of elements form covalent compounds?
Answer:
Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom. In general, ionic bonds occur between elements that are far apart on the periodic table.
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A plant uses the energy from sunlight to create oxygen and glucose from carbon dioxide and water which statement is true about the changes that have occurred
Answer:
The correct answer choice is A. A chemical change has occurred because new compounds have been produced.
Explanation:
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.Example: Melting of ice A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.Example: photosynthesis
Photosynthesis is the process used by plants, algae and certain bacteria to convert energy from sunlight and turn it into chemical energy in the form of glucose which is used a s a source of energy by many organisms.
Thus the true statement is a chemical change has occurred because new compounds have been produced.
A Carnot engine takes 2000 j of heat from a reservoir at 500 k, does some work and discards some heat to a reservoir at 350k . how much work does it do, how much heat is discarded, and what is it's efficiency?
Answer:
Explanation:
The Carnot engine is a theoretical or conceptual heat engine that has a higher efficiency than any practical or theoretical heat engine working between the same temperature range. The theoretical efficiency of a Carnot engine is considered as the highest efficiency and no practical heat engines can operate at that efficiency. A Carnot engine draws heat energy, performs useful work and the leftover energy is released from the working substance. According to the second law of thermodynamics, there must be a temperature gradient between the heat energy drawing point and release point of the heat engine.
What is the process of solar nuclear fusion?
Answer:
base sa research po
Explanation:
In the core of the Sun hydrogen is being converted into helium. This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom. During the process some of the mass is converted into energy.
Answer:
Hydrogen atoms are fused into deuterium, then helium-3, then helium-4, each step giving off large amounts of energy.
Explanation:
Because that's how it works :D
A student reads that sodium atoms (Na) react with chlorine (Cl2) molecules to form the compound sodium chloride (NaCl). Which model should the student make to satisfy the Law of Conservation of Matter for the formation of sodium chloride, in simplest form?
Answer:
c
Explanation:
Law of Conservation of Matter for the formation of sodium chloride, in simplest form would be obeyed when 2 moles of sodium react with 1 ,mole of chlorine to form 2 moles of sodium chloride.
What is law of conservation of matter?According to law of conservation of matter, it is evident that matter is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of matter and energy are related as matter has mass and mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of matter is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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4 Mg & 3 Cu(NO3)2 + Cu(NO3)2 (aq) + Mg(NO3)2 (aq) + Cu (s)
balance?
Here you go
Mg + 2CuNO3 → Mg(NO3)2 + 2Cu
What is the interaction between atmosphere and biosphere
Answer:
Biosphere-Atmosphere Interactions focuses on the sources and sinks of greenhouse gases (GHGs), air pollutants, particulate matter, water, and energy between the Earth's surface and the atmosphere.
Explanation:
50 PTS!!!!! Please answer without links!
What type of chemical reaction happens with Aerobic Cellular Respiration?
Synthesis, decomposition, single displacement, double displacement, or combustion.
calculate the mass of 1 molecule of water and 100 molecules of glucose
Answer:
The mass of 1 molecule of water is 18.02
The mass of 100 molecules of glucose is 18000
I hope this is correct, and helps you out :)
What is the balanced net ionic equation when aqueous solutions of Pb(NO3)2 and KBr are mixed and form a product
Answer:
KBr+Pb(NO3)2=? is an equation you can use.
Explanation:
Anyone mind answering this
Question 13(Multiple Choice Worth 5 points)
(03.05 MC)
Liquid X has a pH of 7 and Liquid Y has a pH of 8.5. Which statement is true?
Liquid X is a base and Liquid Y is an acid.
Liquid X is an acid and Liquid Y is a base.
Liquid X is neutral and Liquid Y is a base.
Liquid X is an acid and Liquid Y is neutral.
Answer:
Liquid X is neutral and Liquid Y is a base
Explanation:
Acid: pH<7
Neutral: pH=7
Base: pH>7
Passive prostheses are:
- self-regulated
- easily corroded
- made of nanotubes
- self-powered
Passive prostheses are self-regulating, as shown in the first answer option.
We can arrive at this answer because:
Passive prostheses are devices used to replace parts of the body that were lost by an incident.These prostheses are very useful to establish balance or the aesthetics of the body, but they have no articulations and no movement mechanism, being static.This limitation allows passive prostheses not to need external regulation and to be self-regulated by fitting the body parts.
You can find more information about articulations and their effects on the link:
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Answer:
self-powered.