Answer:
The answer is A. a wave of vibrating electric and magnetic energy.
how many elements are there
Answer:
there r 118 elements in periodic table..
hope it helps.
Explanation:
there are 118 elements.
Explain how observations differ from inferences?
A 40.0 liter gas tank contains 70.0 moles of hydrogen gas. What would be the volume of the tank which could hold 50.0 moles of hydrogen gas at the same temperature and pressure
Answer:
[tex]V_2=28.6L[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to solve this problem via the Avogadro's gas law as a way to understand the volume-moles behavior as a directly proportional relationship:
[tex]\frac{V_2}{n_2}=\frac{V_1}{n_1}[/tex]
In such a way, we solve for the final volume as shown below:
[tex]V_2=\frac{V_1n_2}{n_1} \\\\V_2=\frac{40.0L*50.0mol}{70.0mol}\\\\V_2=28.6L[/tex]
Regards!
2K + Cl2 —> 2KCl
how many moles of KCl will be produced if you have 6.0 moles of K?
Answer:
6 moles
Explanation:
what is the pOH of a solution with [H3O+] = 8.2 x 10-5M?
Answer:The pOH of the solution is 9.914
Explanation:
pH is given as the negative logarithm (base 10) of the hydronium ion concentration [H₃O⁺] that is
pH= - log [H₃O⁺]
Since we are given [H₃O⁺]=8.2 x 10⁻⁵,
pH=- log (8.2 x 10⁻⁵)
pH= 4.086
The pOH gives s the measurement of the concentration of OH− ions, Hence,
pH + pOH= 14
from the above calculation, we got pH=4.086
So
4.086 + pOH=14
pOH= 14 - 4.086
pOH= 9.914
The pOH of the solution is 9.914
An increase in the temperature of a liquid decreases the rate of
evaporation, true or false?
Answer:
False
Explanation:
The increase in the temperature of a liquid also increases the rate of evaporation, as the same for the other way around. As intermolecular force increase rate of evaporation decreases. This happens because intermolecular force make it less likely for the molecules on the surface to escape from liquid and become vapour gas. As temperature increases rate of evaporation increases.
It is important that the United States move with all deliberate speed to develop and get into usage alternative fuels that will allow us to end our dependence on foreign oil. —Congressman Virgil Goode
A. What are the renewable resources being referred to in this quote?
B. What is the nonrenewable resource being referred to in this quote?
C. Why might it be important to move from nonrenewable resources to renewable resources?
Answer:
A. Solar, wind, hydro, nuclear, tidal, and biomass are renewable resources
B. Oil, coal, and natural gasses are the fossil fuels that are nonrenewable resources
C. It is important to move from nonrenewable to renewable because nonrenewable resources will run out and they also create greenhouse gases that hurt the enviroment and cause global warming. Renewable resources are cleaner and either don't run out, or replenish fast enough to not run out
A relationship between two organisms that benefits both organisms is called
A. symbiosis
B.mutualis
C. commensalism
D.parasitism
Answer:
Mutualism
Explanation:
A relationship in which both benefit
Which molecule is shown below
Answer:
A
Explanation:
You can see the top part looks kinda like methane, and the bottom part looks like hexane.
Answer:
A is correctvia A P E x
Explanation:
( copper is Cu) How many Copper atoms in 3CuSO 4
Need help ASAP !!!!!
A 46 g piece of metal at 250C is placed in a calorimeter with 500. mL of water at 20C. If the final temperature was 24C, the specific heat of the metal is what?
what causes planet Earth to have season? and in the summer which way would the Earth be facing?
How many moles are in 3 x 10^23 atoms of gold
Answer:
0.50 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{3 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3}{6.02} \\ = 0.49833...[/tex]
We have the final answer as
0.50 molesHope this helps you
What happens to a glass of pure fruit juice when water is added to it?
a
The number of moles of fruit juice increases.
b
The number of moles of fruit juice decreases.
c
The molarity of the juice increases.
d
The molarity of the juice decreases.
Answer:
D is the answer i think
When we add water to a glass of pure fruit the volume of the solution increases while the solute remains constant so the molarity of the juice decreases.
What is Molarity ?Molarity is defined as the amount of solute (in moles)in per litre of solution.
It is also known as molar concentration of a solution , It is expressed in mol/l .
When water is added the volume of the solution is increasing for fixed moles of juices therefore ,
The molarity of the juice will decrease and option d is correct.
To know more about molarity
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How many milliliters of 0.25 M solution of silver nitrate is needed to react with
sodium chloride to produce 7.6 g of silver chloride?
Answer:
To find molarity we must convert grams KCl to moles KCl and mL solution to L: ... EXAMPLE: What mass of potassium chloride would be needed to prepare 250.0 mL of a 0.500 ... EXAMPLE: Silver nitrate solution is added to 25.00 mL of a 0.500 M potassium chloride ... g) 0.655 g of sodium carbonate in 100.0 mL of solution.
Explanation:
List some Industrial plants and indicate the gaseous pollutants they emit
Answer:
Sources of air pollutants from the industry include: power generation plant, boilers, bleaching plants and caustic soda/chlorine plant. Pollutants include particulate matter, chlorine, sulfur dioxides, hydrogen sulfides, carbon dioxide, carbon monoxides and nitrous oxides.
True or false? 1.0 grams of oxygen (O) has the same number of atoms as 1.0 gram of silver (Ag).
Answer:
true hope it helps
Explanation:
have a nice day
What is the concentration of nitrogen gas (N2), in parts per million, in a solution that contains 0.008 grams of nitrogen gas dissolved in 1,000 grams of water?
Answer: The concentration of nitrogen gas in parts per million is 7.99 ppm.
Explanation:
Solute is defined as the component of the solution present in a smaller proportion while the solvent is defined as the component of the solution present in a larger proportion.
Concentration in ppm (parts per million) represents the amount of solute in milligrams present per kilograms of solution.
[tex]\text{Concentration in ppm}=\frac{\text{Mass of solute (in mg)}}{\text{Mass of solution (in kg)}}[/tex]
OR
[tex]\text{Concentration in ppm}=\frac{\text{Mass of solute (in grams)}}{\text{Mass of solution (in grams)}}\times 10^6[/tex] ......(1)
Given values:
Mass of solute (nitrogen gas) = 0.008 g
Mass of solvent (water) = 1000 g
Mass of solution = [0.008 + 1000] g = 1000.008 g
Plugging values in equation 1:
[tex]\text{Concentration in ppm of nitrogen gas}=\frac{0.008g}{1000.008g}\times 10^6\\\\\text{Concentration in ppm of nitrogen gas}=7.99 ppm[/tex]
Hence, the concentration of nitrogen gas in parts per million is 7.99 ppm.
Help please help me
Answer: It completely dissociates in water is a characteristic of strong acid.
Explanation:
An acid which dissociates completely to give hydrogen ions [tex](H^{+})[/tex] is called a strong acid.
For example, HCl is a strong acid and it dissociates completely as follows.
[tex]HCl \rightleftharpoons H^{+} + Cl^{-}[/tex]
Strong acids are able to conduct electricity in water as more number of ions are present in the solution as compared to the ions present in a solution of weak acid.
Strong acids increase the concentration of [tex]H^{+}[/tex] ions.
Thus, we can conclude that it completely dissociates in water is a characteristic of strong acid.
Awarding 50 points for this question!!
From the paragraph in the image, what are the independent, dependent, and control variables?
Answer:
there is no paragraph
Explanation:
A dash of vinegar and baking soda balloon system weighed 65 grams. After releasing the carbon dioxide, the system weighed 63.5 grams. How many grams of carbon dioxide were produced?
Answer:
1.5 grams of carbon dioxide
Explanation:
According to this question, a dash of vinegar and baking soda balloon system weighed 65 grams. The system weighted 63.5grams after releasing the carbon dioxide in it.
This means that, to get the amount of carbon dioxide (CO2) produced in the system, we subtract the mass of the system after releasing CO2 from the initial mass of the system before releasing CO2.
That is;
Mass of CO2 produced = 65g - 63.5g
Mass of CO2 produced = 1.5grams
If 2.1 moles of NaCl is dissolved in a solution with a total volume of 7.3 liters, what is the molarity of the solution? Round to two decimals.
Answer:
The molarity of the solution is 0.29 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity, or molar concentration, is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species. It is defined as the number of moles of solute that are dissolved in a given volume.
Molarity is calculated as the quotient between the number of moles of solutes and the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case:
number of moles of solute= 2.1 molesvolume= 7.3 litersReplacing:
[tex]Molarity=\frac{2.1 moles}{7.3 liters}[/tex]
Molarity= 0.29 [tex]\frac{moles}{liter}[/tex]
The molarity of the solution is 0.29 [tex]\frac{moles}{liter}[/tex]
Answer:
M = 0.29 M
Explanation:
We are given;
Number of moles of NaCl; n = 2.1 moles
Total volume of solution; V = 7.3 L
Formula for molarity is;
M = n/L
Thus;
M = 2.1/7.3
M = 0.2878 M
Approximating to 2 decimal places gives;
M = 0.29 M
In the star's center, the gas is so energized that it has become a sort of super gas, called plasma. The hot plasma is in constant motion. It expands like hot air inside a balloon and pushes outward from the center. Meanwhile, the crushing weight of the star material continues to press inward. In goes the outer material and out goes the inner. The plasma rolls and churns like a hyper hurricane of heat, light, sound, and motion. —A Black Hole Is NOT a Hole, Carolyn Cinami DeCristofano Which question would be a relevant to ask about this text? Why does the plasma in a star expand? Where can I take a hot-air balloon ride? Will there be a hurricane next week?
Answer:
A
Explanation:
Trust me I take the Quiz
What element will lose electrons to form
An ion
Answer:
elements which are basic in nature or we can say that it is a metal so we conclude that it will loose electron or to form an ions
Desiré was investigating a chemical reaction.When she heated it up, she found that sulfuric acid changed into water. She made the following atomic-scale model to show what she thinks happened. Do you think this is a complete model of what happened during the chemical reaction?
Answer:
no it is not a complete model
Which of the following is a true statement?
Work is not needed to create electricity.
Electricity has the ability to do work.
All work requires electricity.
Electricity prevents work from occurring.
Answer:
Electricity has the ability to do work. b. hope dis helps
Explanation:
what is the pH of water?
Answer:
7.00
Explanation:
Pure Water is the only purely neutral substance on earth so it has a neutral pH of 7
What is the concentration if I have 200 mL of water and dissolve 13g of salt in it? Show your work!
Answer:
The concentration is 0.065g/mL
Explanation:
Given
[tex]m = 13g[/tex] --- mass of salt
[tex]V =200mL[/tex] --- volume of water
Required
Determine the concentration (C)
This is calculated as:
[tex]C = \frac{m}{V}[/tex]
[tex]C = \frac{13g}{200mL}[/tex]
[tex]C = \frac{13}{200}g/mL[/tex]
[tex]C = 0.065g/mL[/tex]
The concentration is 0.065g/mL
Calculate the mass, in grams, of 0.965 mol of sodium hydroxide
(NaOH), in a drain cleaning solution.
Answer:
38.51g NaOH
Explanation:
NaOH=39.907 g/mol
0.965 mol NaOH X 39.90g NaoH/1 mol NaOH= 38.51 g NaOH
The chemical equation shows the production of magnesium chloride.
Mg + 2HCl → MgCl2 + H2
How many grams of H2 will be produced from 12 grams of Mg?
Answer:
1 gram of H2 will be produced from 12 grams of Mg.
Explanation:
According to Stoichiometry, 0.5 moles of Mg are present. 1 mole of Mg produces 1 mole of H2, so 0.5 moles of Mg will produce 0.5 moles of H2. Multiplying molar mass of H2 i.e. 2 gram/mole with 0.5 moles, we can find the mass of H2 in grams which is 1 gram.