Answer:
Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure. Pure substances are further classified as elements and compounds. An element is a substance that consists of only one type or kind of atom
Answer:
define the term pure substance :
A pure substance does not have to be of a single element or compound, This can either be one single element or one single compound, but every sample of this substance that you examine must contain exactly the same thing with a fixed, definite set of properties
Explanation:
An experiment was conducted to see which metal pot would be better for cooking food quickly. The table below shows how quickly small pieces of wax melted during the experiment.
Type of metal
Time for the wax to melt (seconds)
Aluminum
27
Bronze
45
Copper
15
Steel
80
The following statement was made after the data were examined: “Copper pots are the best pots for cooking food quickly.” Which term best describes this statement?
conclusion
hypothesis
procedure
result
Answer:
Conclusion.....hope this helps
Answer:
conclusion
Explanation:
How to Convert 0.75g of nitrogen gas (N2) to liters.
24
N2=22.4 liters
18g=22.4 litters
18÷.75=24
Convert 18.6 L of neon gas at STP to atoms.
1.What is the coefficient of the scientific notation answer? 2.What is the exponent of the scientific notation answer? 3.How many significant figures are there in the answer?
4.What is the right most significant figure in the answer ?
Answer:
See explanation
Explanation:
1 mole of Ne occupies 22.4 L
x moles of Ne occupies 18.6 L
x = 1 mole * 18.6 L/22.4 L
x = 0.83 moles
1 mole contains 6.02 * 10^23 atoms
0.83 moles occupies 0.83 moles * 6.02 * 10^23 atoms/1 mole
= 4.9966 * 10^23 atoms = 5.0 * 10^23 atoms
the coefficient of the scientific notation answer =5.0
the exponent of the scientific notation answer = 23
significant figures are there in the answer = 5
the right most significant figure in the answer = 1
What is the mass of 5.6 moles of Iron (III) Oxide?
Answer:
312.731
Explanation:
it had a long answer but im sure ur teacher wanted u to round it
hope this helps!
~goldfishareswag/brianna
:)
when copper wires are made, a copper rod is pulled into a narrower wire. Explain how metallic bonding allows this to happen
Answer:
possibly because of the malleability of metals
Explanation:
In metallic bonding, electrons are delocalized and move freely among nuclei. When a force is exerted n the metal, the nuclei shift, but the bonds do not break, giving metals their characteristic malleability.
the answer has to be 3 to 5 sentences for me to get full credit. ❤❤
1. ______is an ion, or molecule that is a proton donor.
1. What do gram-formula mass and atomic mass have in common? How are they different?
where are human cells located (in living organisms)
Match these items.
No links please!
Definitions:
1. Built the first American A.C. generator.
2. Found a relationship between electricity and magnetism.
3. Associated with gas and oil.
4. First workable electric light bulb.
5. Developed the equations E=mc^2
6. Provides majority of the energy in the United States.
7. Splitting heavy atoms
8. Produces plutonium
9. Powered by falling water or stream pressure
10. Thin silicon slices
11. Using heat from the earth
Term names:
a. Oersted
b. Geothermal
c. Edison
d. Einstein
e. Salt dome
f. Turbine
g. Fission
h. Westinghouse
i. Solar cells
j. Gas and oil
k. Breeder
[tex]\huge{\mathbb{\tt { QUESTION↓}}}[/tex]
1. Built the first American A.C. generator.
2. Found a relationship between electricity and magnetism.
3. Associated with gas and oil.
4. First workable electric light bulb.
5. Developed the equations E=mc^2
6. Provides majority of the energy in the United States.
7. Splitting heavy atoms
8. Produces plutonium
9. Powered by falling water or stream pressure
10. Thin silicon slices
11. Using heat from the earth
[tex]\huge{\mathbb{\tt {ANSWER↓}}}[/tex]
[tex]\color{black}{\tt {1.) \: h. \: Westing \: house}}[/tex]
Built the first American A.C. generator[tex]\color{black}{\tt {2.) \: Oersted}}[/tex]
Hans Christian Oersted discovered the relationship between electricity and magnetism in 1820.[tex]\color{black}{\tt {3.) \: j. Gas \: and \: oil}}[/tex]
Associated gas refers to the natural gas found in association with oil within the reservoir. There are also reservoirs that contain only natural gas and no oil, this gas is termed non-associated gas.[tex]\color{black}{\tt {4.) \: c.Edison}}[/tex]
By January 1879, at his laboratory in Menlo Park, New Jersey, Edison had built his first high resistance, incandescent electric light. It worked by passing electricity through a thin platinum filament in the glass vacuum bulb, which delayed the filament from melting. Still, the lamp only burned for a few short hours.[tex]\color{black}{\tt { 5.) \: d. Einstein}}[/tex]
E = mc2, equation in German-born physicist Albert Einstein's theory of special relativity that expresses the fact that mass and energy are the same physical entity and can be changed into each other.[tex]\color{black}{\tt {6.)i.solar cells}}[/tex]
Energy Sources in the United StatesPetroleum (crude oil and natural gas plant liquids): 28% Coal: 17.8% Renewable energy: 12.7% Nuclear electric power: 9.6%"[tex]\color{black}{\tt { 7.) \: g. fission}}[/tex]
Nuclear fission is a process by which the nucleus of an atom is split into two or more smaller nuclei, known as fission products. The fission of heavy elements is an exothermic reaction, and huge amounts of energy are released in the process.[tex]\color{black}{\tt { 8.) Sorry \: but \: I \: don't \: know \: the \: answer}}[/tex]
[tex]\color{black}{\tt { 9.) Sorry \: but \: i \: don't \: know \: the \: answer}}[/tex]
[tex]\color{black}{\tt { 10. ) \: Sorry \: \: But \: I \: don't \: know \: the \: answer }} [/tex]
[tex]\color{black}{\tt {11.) \: b. Geothermal}}[/tex]
Geothermal/GSHP systems take advantage of nature's underground temperatures by exchanging heat with the earth using an underground network of water (or refrigerant) filled pipes. In the winter, the liquid pulls heat from the ground and transfers it to the house through an exchanger.#CarryOnLearning
#LetsEnjoyTheSummer
→XxKim02xXThe importance of improving soil usage FULL SENTENCES 50 POINTS HELP PLEASE
how do particles differ after a physical change?
Answer:
They are still the same particals just. packed together diffrently depending on what stae of matter it's in.
Explanation:
How many moles of HCl are present in 1.30 L of a 0.50 M solution
0.50 moles
3.00 moles
O 0.65 moles
0 1.50 moles
Answer:
0.65moles of HCl was produced
A book is pushed and released and it slides across a table for a short distance. The book quickly comes to a stop. The book originally
has kinetic energy. To what form of energy is the kinetic energy transformed?
A)
The kinetic energy is transformed into heat.
B)
The kinetic energy is transformed into chemical energy.
C)
The kinetic energy is not transformed into any other type of energy.
Eliminate
D)
The kinetic energy is transformed into electrical energy.
Law of Conservation of Energy
(58P2.c) Energy Transformation
D 149628
Regular Cals
Scientific Cals
My
Answer:
A
Explanation:
The book encountered friction which turned some of the energy into heat.
Adi loves the smell of lavender, so she decides to press a few petals of the flower until they release a few drops of oil. She wants to determine the molecular weight of the oily substance to try to identify the fragrance she likes so much. Her lab instructor tells her that her experiment will not work. Why do you think it will not work?
Answer:
See Explanation
Explanation:
What Adi failed to realize is that the oily substance that was obtained from lavender consists of a mixture of substances. It is not only the required fragrance that is present in the extract.
This experiment will not work because those other components in the mixture may be erroneously identified when they show up in the mass spectrum of the extract and may be mistaken for the fragrance in question.
Hence the experiment will not work because; if some kind of separation method is not used to identify other impurities in the oil, many other substances may be mistaken for the actual fragrance.
Can you help me please..
Answer:
Using Charles law of Gas
Explanation:
do weight loss Subliminals work?
Answer:
Some early research suggests that subliminal messages may influence food- and diet-related thoughts and behaviors. However, other research has found that subliminal messages with weight loss cues have no effect.
Explanation:
Do the chemical bonds between atoms change during cellular respiration?
Which of the following answers below is the correctly balanced half-reaction for the reduction of the SO4 ^-2 ion in acid solution? The answer is C, but I don’t understand why. Thanks in advance :-)
Answer:
C
Explanation:
The oxidation number of Sulphur in SO4^2- is;
x + 4(-2) = -2
x - 8 = -2
x = -2 + 8
x = 6
Now,
the oxidation number of sulphur in H2SO3 is
2 (1) + x + 3(-2) = 0
2 + x -6 = 0
-4 + x = 0
x = 4
Hence, the oxidation number of sulphur changed from +6 to +4 which signifies gain of two electrons as shown in option C.
Describe the composition of a molecular compound. What are two major characteristics of molecular compounds?
Answer:
A molecular compound is composed of two or more non metallic elements that are held together by covalent bonds.
The two major characteristics of molecular compounds are;
1.) They are held by covalent bonds
2.) They generally have poor conductivity
Explanation:
A molecular compound is one where two or more molecules come together to form a compound. Unlike ionic compounds that combine by the transfer of electrons, molecular compounds form by sharing electrons. The pairing of the electrons is what holds the molecules together and is known as covalent bonding.
A molecular compound has various characteristics, some of which are;
- Generally low melting and boiling points
- Soft solid forms
- Low enthalpy of fusion and vaporization.
But the two major characteristics of molecular compounds are;
1.) They are held together by covalent bonds.
The elements in a molecular compound share their electrons by having their atoms bond chemically to each other.
2.) They generally have poor conductivity
Molecular compounds do not conduct electricity and heat properly. Because they are formed by sharing electrons, they usually have no free electrons left to conduct electricity.
56.8 grams of glucose is dissolved in acetic acid. The boiling point of the acetic acid raises to 126.6°C. What is the molal concentration of the solution?
Answer:
Molal concentration of glucose = 2.64 m
Explanation:
The excersise can be solved by the formula for colligative property, elevation of boiling point.
ΔT = Kb . m . i
As glucose (C₆H₁₂O₆) is an organic compound, i = 1. (No ions generated)
ΔT = Boiling T° for solution - Boiling T° of pure solvent
Kb = Ebulloscopic constant.
We need data from acetic acid.
Boiling T° of pure solvent: 118.1°C
Kb = 3.22 °C/m
We replace data:
126.6°C - 118.1°C = 3.22°C/m . m . 1
(126.6°C - 118.1°C) / 3.22 m/°C = m
Molality = 2.64 mol/kg
A 1.2 M solution of a weak base B is prepared. Using a pH meter, the pH is measured to be 11.82. Calculate the base ionization constant
Answer:
Kb = 3.64x10⁻⁵
Explanation:
First we calculate the pOH of the solution:
pOH = 14 - pHpOH = 2.18Then we calculate [OH⁻]:
pOH = -log[OH⁻][OH⁻] = [tex]10^{-pOH}[/tex][OH⁻] = 0.0066 MFor a weak base solution with a relatively high concentration, we can use the following formula:
[OH⁻] = [tex]\sqrt{Kb*C}[/tex]Where C is the concentration of the weak base solution (1.2 M in this case).
With the formula above we can calculate Kb:
0.0066 = [tex]\sqrt{Kb*1.2}[/tex]Kb = 3.64x10⁻⁵How is a sound wave transmitted? Please help me I have a test.
Answer: energy is transferred through vibration of air particles or particles of a solid through which the sound travels.
Answer:
Sound is transmitted by vibrating a object and the waves move through particles.
Explanation:
Which of the following accurately describes the orbital path of most planets in our solar system?
The orbital path is in a perfect circle.
The orbital path looks circular.
The orbital path is in a large elliptical shape.
The orbital path varies greatly from planet to planet.
In at least 4 complete sentences, describe the similarities and differences between Avogadro's Law and Charles' Law.
answer
Avogadro's law states that, at constant temperature and pressure, the volume of a gas is directly proportional to the number of moles present. In other words, equal volumes of gases at the same pressure and temperature contain the same number of molecules - this is true regardless of their physical properties or chemical nature.
This number of molecules is
6.022
⋅
10
23
and is known as Avogadro's number,
N
A
.
Matematically, Avogadro's law can be written like this
V
n
=
c
o
n
s
t
, or, better yet,
V
1
n
1
=
V
2
n
2
.
Avogadro's law, as well as Boyle's law and Charles' law, are special cases of the ideal gas law,
P
V
=
n
R
T
. If temperature and pressure are kept constant, and knowing that
R
is of course constant, then
P
V
=
n
R
T
→
P
V
n
=
R
T
→
V
n
=
R
T
P
=
c
o
n
s
t
, which represents Avogadro's law.
The ideal gas law can also be written to incorporate
N
A
, since the number of moles are actually the number of molecules divided by Avogadro's number
P
V
=
N
N
A
⋅
R
T
, where
N
represents the number of molecules.
Pick 1 answer, please help!
Answer:
B
Explanation:
Answer: D
Explanation: no explanation just D
Which a balanced chemical equation ? O C 7 H 16 +5O 2 6CO 2 +4H 2 O OB C 7 H 16 +11O 2 7CO 2 +8H 2 O C 7 H 16 +14O 2 7CO 2 +5H 2 O OD . C 7 H 16 +22O 2 14CO 2 +16H 2 O
Answer: [tex]C_7H_{16}+11O_2\rightarrow 7CO_2+8H_2O[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical equation is:
[tex]C_7H_{16}+11O_2\rightarrow 7CO_2+8H_2O[/tex]
I have a Helium party balloon that can hold 3.0 liters of gas. If I blow up this balloon with 0.10 moles of oxygen gas at a pressure of 1.0 atmosphere, what is the temperature of the balloon?
Answer:
I am not yet sure on my answer
I would not want to give you wrong answers
Sorry
how humans can improve the negative aspects of soil use FULL SENTENCES 50 POINTS PLEASE HELP
Answer:
Using diverse nutrient sources can help maintain soil health. Manure and compost add organic matter as well as an array of nutrients, but using just compost or manure to meet the nitrogen needs of the crop every year can result in excessive phosphorus levels in the soil.
1.9x10^23 atoms of sulfur to grams of sulfur
Answer:
see explanation and punch in the numbers yourself ( will be better for your test)
Explanation:
If you are given atoms you need to divide by Avogadro's number 6.022x10^23
then you will have moles of sulfur-- once you have moles multiply by the molar mass of sulfur to go from moles to grams
mm of sulfur is 32 g/mol
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, the grams of sulfur in 1.9x10²³ atoms of sulfur is 9.92g.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance.
Given number of atoms= 1.9x10²³atoms
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
Substituting the values
mole=1.9x10²³÷ 6.022×10²³
mole = 0.31 mole of sulfur
Mole = given mass÷ Molar mass
Molar mass of sulfur=32g/mol
mass of sulfur =0.31 mole ×32g/mol
mass of sulfur=9.92g
Therefore, the grams of sulfur in 1.9x10²³ atoms of sulfur is 9.92g.
To know more about mole, here:
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