Answer:
False.
Explanation:
Hello.
In this case since sodium is a soft brilliant metal and chlorine is a green gas at normal conditions, they have totally different properties. Thus, since sodium chloride is also known as the table salt which is present as white crystals we can infer that the compound does not have the same properties, therefore it is false.
Regards.
One mole of X contains how many molecules of X
Answer:
The mole is represented by Avogadro's number, which is 6.022×1023 atoms or molecules per mol
Explanation:
A chemist decomposes several samples of water into hydrogen and oxygen and weighs or more correctly measures the mass of the hydrogen and the oxygen obtained. The results are as follows sample 1 has 1.5grams of hydrogen and 12grams of oxygen sample 2 has 2grams of hydrogen and 16 grams of oxygen sample 3 has 2.5grams and 20 grams of oxygen
a. Can you summarize these observations in a short statement? Next, the chemist decomposes several samples of carbon dioxide into carbon and oxygen. The results are as follows: sample 1 has 0.5grams of carbon and 1.3grams of oxygen sample 2 has 1.0grams of carbon and 2.7grams of oxygen sample 3 has 1.5grams of carbon and 4.0grams of oxygen
b. Summarize these observations in a short statement?
c. Formulate a law from the observations in (a) and (b)?
d. Formulate a theory that might explain your law in (c)?
Answer:
A. Hydrogen and oxygen combines in a constant mole ratio in all the three water samples
B. Carbon and oxygen are combined in a constant mole ratio in all the three samples of carbon dioxide
C. All pure samples of a compound contain the same elements combined in the same proportion by mass
D. Since the same elements are always combining to form a certain compound, and the atoms of each element has its own mass, the atoms of each element combining to form the compound do so in a fixed proportion by mass.
Explanation:
A. molar mass of hydrogen = 1.0 g/mol; molar mass of oxygen = 16 g/mol
The molar ratio of elements in a compound gives the proportion each element is combined with the other by mass.
molar ratio of hydrogen to oxygen in the samples:
Sample 1: Hydrogen; 1.5/1 = 1.5: Oxygen; 12/16 = 0.75
molar ratio = 1.5/0.75 = 2 : 0.75./0.75 = 1
molar ratio = 2:1
Sample 2: Hydrogen; 2/1 = 2: Oxygen; 16/16 = 1
molar ratio = 2/1 = 2 : 1/1 = 1
molar ratio = 2:1
Sample 3: Hydrogen; 2.5/1 = 2.5: Oxygen; 20/16 = 1.25
molar ratio = 2.5/1.25 = 2 : 1.25/1.25 = 1
molar ratio = 2:1
Hydrogen and oxygen combines in a constant mole ratio in all the three water samples
B. molar mass of carbon = 12 g/mol; molar mass of oxygen = 16 g/mol
molar ratio of carbon to oxygen in the samples:
Sample 1: Carbon; 0.5/12 = 0.04 : Oxygen; 1.3/16 = 0.08
molar ratio = 0.04/0.04 = 1 : 0.08/0.04 = 2
molar ratio = 1:2
Sample 2: Carbon; 1.0/12 = 0.083 : Oxygen; 2.7/16 = 0.168
molar ratio = 0.083/0.083 = 1 : 0.168/0.083 = 2
molar ratio = 1:2
Sample 3: Carbon; 1.5/12 = 0.125 : Oxygen; 4.0/16 = 0.250
molar ratio = 0.125/0.125 = 1: 0.250/0.125 = 2
molar ratio = 1:2
Carbon and oxygen are combined in a constant mole ratio in all the three samples of carbon dioxide
C. All pure samples of a compound contain the same elements combined in the same proportion by mass
D. Since the same elements are always combining to form a certain compound, and the atoms of each element has its own mass, the atoms of each element combining to form the compound do so in a fixed proportion by mass.
H2S(aq) + Ca(OH)2(aq)
Answer:
CaS + 2H2O is the balanced equation
Which is the electron configuration for lithium? A. 1s2 B. 2s3 C. 1s22s1 D. 1s12s2
Answer:
C
Explanation:
just took the test on edge
The electron configuration for lithium [tex]1s^{2} 2s^{1}[/tex]. So, the correct answer is C.
Electronic configuration:-The electron configuration of an element describes how electrons are distributed in its atomic orbitals. Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.
Electronic configuration for lithium:-The atomic number of lithium is 3. So, the electronic configuration is as follows:-
[tex]Li= 1s^{2} 2s^{1}\\=(He) 2s^{1}[/tex]
So, the correct option is C.
Learn more about the electronic configuration here:-
https://brainly.com/question/20391416
You put water and lots of table sugar into a beaker and then heat the solution until all the sugar dissolves, creating a supersaturated solution. You then allow the solution to cool slowly to room temperature. Next, you drop a crystal of sugar into the solution. What happens? A. The tiny crystal dissolves instantly. B. The crystal dissolves completely as it sinks in the solution. C. The crystal sinks slowly to the bottom without dissolving. D. Crystals appear suddenly in the beaker.
Answer:
D.Crystals appear suddenly in the beaker
Explanation:
what is inside an atom
True or False: Observations are just things that you see
Answer:
False
Explanation:
"Observations is the action of observing something or someone carefully or in order to gain information" - google dictionary. This definition does not completely match the definition given, so the answer is false.
I hope this helps!
Answer: true
Explanation: the action or process of observing something or someone carefully or in order to gain information that is the real definition
Vacuoles are round organelles found in both plant and animal cells. Their primary function is to -
produce food and energy for the cell.
control the activities of the cell.
transport materials between parts of the cell.
store water, waste, and nutrients for the cell.
Answer:
D.) store water, waste, and nutrients for the cell.
Explanation:
D is your answer because the vacuole is like a closet for the cell. It can store anything the cell may use later or it can store waste that is to be taken out of the cell at a later time as to not contaminate the rest of the organelles. In plant cells, it can also help with support since it is so big.
A polysaccharide is best described as
A. glucose
B. 1 simple sugar
C. 3 or more simple sugars combined
(!!!MAKE UP A FAKE ANSWER OR ONE THAT MAKES NO SENSE
I WILL REPORT YOU AND DELETE YOUR ANSWER!!!)
Answer:
3 or more simple sugars combined
Explanation:
A polysaccharid molecules consist of a number of sugar molecules bonded together.
Answer:
Explanation:
is the longest stage of the cell cycle.
Answer:
Interphase is the longest part of the cell cycle, this is when the cell grows and copies its DNA before moving into mitosis.
Explanation:
Answer:
Interphase
Explanation:
What is true of neutrons? (3 points)
They have no charge and are located inside the nucleus.
They have no charge and are located outside the nucleus.
They are negatively charged and are located inside the nucleus.
They are negatively charged and are located outside the nucleus.
Answer:
They have no charge and are located inside the nucleus
How many grams of calcium phosphate is present in a 5.75x10^-4 mol sample of calcium phosphate
Answer:
about1200 bc it isnt ordinary to round the 1200 to the 12th power so your answer will be 12450
Explanation:
In Section 3.5, we applied the equations for a particle in a box to the TC electrons in butadiene. This simple model is called the free-electron model. Using the same argument, show that the length of hexatriene can be estimated to be 867 pm. Show that the first electronic transition is predicted to occur at 2.8 x 104 cm-1. (Remember that hexatriene has six TC electrons.)
Answer: DeltaE = 2.83 * 10^4 cm^-1
Explanation:
hexatriene has six TC (pi) electrons
3 C = C BONDS : 3 * 135 = 405 pm
2 C - C BONDS : 2 * 154 = 308 pm
also the TWO CARBON ATOMIC RADIUS AT EACH END : 2 * 44 = 154 pm
therefore length of molecule = 405pm + 308pm + 154pm = 867 pm
now
HoMo = E4 and CoMo = E3
DeltaE = E4 - E3 = (4^2h^2 / 8mL^2) - (3^2h^2 / 8mL^2)
DeltaE = 7h^2 / 8mL^2
DeltaE = 7 * (6.62 *10^-35 Js)^2 / ( 8 * 9.1*10^-31 kg * (867*10-12m)^2)
DeltaE = 5.62 * 10^-19 J
( 1J = 5.034 * 10^22 cm^-1)
therefore
DeltaE = 2.83 * 10^4 cm^-1
Is magnetite organic?
Answer: organic
Explanation:
1. In Parts I and II of the lab, what happened to the electrons of each element to produce the different colors of light? Explain your answers using important terms from the lesson and information provided in the laboratory. (sorry if it's hard to answer it's a lab)
Answer: Electrons must be heated to emitted light. When heat was added to the elements,the electrons absorbs the energy and moves to its excited state. Once the electronstarts to fall back to a lower orbit, it emits energy in the form of light. Thedifferent lights being emitted, depends on their wavelength
Explanation: I did the Quantization of Energy Lab
Oxidation number of the sulfur and chloride in the sulfur tetrachloride?
+1
Its chemical formula is S2Cl2. It contains sulfur in its +1 oxidation state.
Which type of rock typically has the largest formed crystals?
A) metamorphic
B) sedimentary
C) extrusive igneous (Its not C)
D) intrusive igneous
It’s D bro bro
Plus u can look up the rocks one by one and just put creates crystals?
Answer:
ITS D
Explanation:
DID THE USATESTPREP
When determining an element’s chemical properties, the most important subatomic particle to look at is
—
F. protons
G. valence electrons
H. neutrons
J. positrons
The density of copper is 8.94 g/cm3. An irregular shaped sample of metal is 14 g and displaces a volume of 2.98 mL. (a) Find the density of this unknown metal. (b) Is this metal copper?
Explanation:
(a).The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass of metal = 14 g
volume = 2.98 mL = 2.98 cm³
It's density is
[tex]density = \frac{14}{2.98} \\ = 4.69798657...[/tex]
We have the answer as
4.70 g/cm³
(b).The metal is not copper since it's density is less than that of copper.
Hope this helps you
Determine whether each statement describes a solution of a strong electrolyte, weak electrolyte, or non-electrolyte.
Has a medium level of conductivity Choose...
Contains a complete solute Choose...
Has little or no conductivity Choose...
Has the highest conductivity Choose...
Contains a completely dissociated solute Choose...
Contains a partially dissociated solute
Answer:
Please find the terms with their correct description in the explanation section.
Explanation:
An electrolyte is a substance that dissociates or ionizes into cations (positive charged ions) and anions (negative charged ions) in an aqueous solution. An electrolyte can either be strong or weak depending on how well it ionizes and its level of conductivity. However, a non-electrolyte neither ionizes in a solution nor conducts electricity.
Based on this;
1. Weak electrolyte: Has a medium level of conductivity i.e. partially conducts electricity
2. Strong electrolyte: Contains a complete solute
3. Non-electrolyte: Has little or no conductivity i.e. cannot conduct electricity because it doesn't dissociate into ions.
4. Strong electrolyte: Has the highest conductivity i.e. conducts electricity very well.
5. Strong electrolyte: Contains a completely dissociated solute i.e. the solute of the electrolyte separates into anions and cations completely.
6. Weak electrolyte: Contains a partially dissociated solute i.e. the ions of the solute do not ionize completely in the solution.
Weak electrolyte, strong electrolyte, non-electrolyte, strong electrolyte strong electrolyte and weak electrolyte are the answers of the each statement.
Has a medium level of conductivity means it conducts partially electricity not fully so we can say that it is a weak electrolyte. It also contains a partially dissociated solute i.e. the solute do not ionize completely into ions in the solution.
Contains a complete solute as well as has the highest conductivity means conducts electricity better refers to Strong electrolyte. It contains a completely dissociated solute i.e. the solute of the electrolyte separates into anions and cations completely so that's why it conducts electricity very well. Non-electrolyte has little or no conductivity means it cannot conduct electricity due to no dissociation into ions.
Learn more: https://brainly.com/question/18000104
2 points
7. Given the following specific heats of energy, if the materials were left
out in the sun for 2 hours, which material would be the hottest? *
Material A: 2.03 J/gC
Material B: 0.71 J/gC
Material C: 0.89 J/gC
Material D: 0.45 J/gC
Answer:
Material D as its specific heat is the smallest.
Explanation:
Hello.
In this case, since the specific heat is defined as the energy required to increase (or decrease) 1 gram of a material by 1 °C, we can infer that the smaller the specific, the less energy is required for such temperature change, therefore, since material D needs 0.45 J of energy to increase the temperature of 1 g by 1 °C we can see that it will become the hottest as it has the smallest specific heat among the other ones.
Best regards.
83.80 round to nearst whole
Greetings! Hope this helps!
Answer
84 would be your answer
Have a good day!
_______________
A brainliest would help tons! :D
*Will give Brainliest* What is the average atomic mass of one molecule of methane, which has one 12C atom and four 1H atoms?
Answer:
The atomic mass of methane (CH4)is 12 amu for the carbon plus 4 x 1 amu for the four hydrogens, for a total of 16 amu. Therefore, the molar mass of methane is 16g.
BALANCING EQUATION
XCiz(aq) + AgNO3(aq)
X(NO3)2(aq) + AgCl(s)
Answer:
Explanation:
XCL2 + 2AgNO3 aq ----------- 2 AgCl ( aq ) + X (NO3)2
How many atoms of lead are in 3.5 moles of lead?
Answer:
2.1 × 10²⁴ atoms Pb
Explanation:
Avogadro's number: 6.022 × 10²³
Step 1: Find conversions
1 mol Pb = 6.022 × 10²³ atoms Pb
Step 2: Use Dimensional Analysis
[tex]3.5 \hspace{3} mol \hspace{3} Pb(\frac{6.022(10)^{23} \hspace{3} atoms \hspace{3} Pb}{1 \hspace{3} mol \hspace{3} Pb} )[/tex] = 2.107 × 10²⁴ atoms Pb
Step 3: Simplify
We have 2 sig figs.
2.107 × 10²⁴ atoms Pb ≈ 2.1 × 10²⁴ atoms Pb
Choose the hypothesis for this controlled experiment that answers this question: “Does sunlight cause dyes in clothing to fade?”
Dyes in the cloth are created to withstand fading when being washed in the washing machine.
Dyes fade by being exposed to direct sunlight over a period of two weeks.
You cannot determine whether the sunlight causes the dyes in clothing to fade.
Heat causes dyes in cloth to fade over a period of one week.
Answer:
Dyes fade by being exposed to direct sunlight over a period of two weeks.
Explanation:
Lava is rock that has undergone a physical change and has liquefied. What is known about this change?
The lava gained mass.
The lava was burned into smoke.
The lava can cool back into rock.
The lava lost mass.
Answer:
It is C-The lava can cool back into rock.
Explanation:
The lava can cool back into rock when it under go physical change and has liquefied.
What is lava?Lava is defined as a molten and partially molten rock (magma) that has expelled from the interior of the terrestrial planet earth or a moon into its surface.
Lava is made up of crystal, volcanic glasses and bubbles.
In liquid lava state, the particle are able move around and slide past one another.
When heat energy is removed from the liquid lava, the particle become more strongly attached to one another and the substance transit back into solid rock state.
Thus, the lava can cool back into rock when it under go physical change and has liquefied.
To learn more about lava, refer to the link below:
https://brainly.com/question/20178020
#SPJ6
The gas CO2 is diffusing at steady state through a tube 0.20 meters long. The tube has a diameter of 0.01 meters and also contains N2 at 298 K. The total pressure inside the tube is constant at 101.32 kPa. The partial pressure of CO2 is 456 mm Hg at one end and 76 mm Hg at the other end. The diffusion coefficient of CO2 in N2 is 1.67 x 10-5 m2 /sec at 298 K. Calculate the molar flux of CO2 in SI units, assuming equimolar counter-diffusion between the CO2 and N2 gases.
Answer:
[tex]\mathbf{N_A = 1.71 \times 10^{-6} \ kmol/m^2.s}[/tex]
Explanation:
From the given information:
The total length = 0.20 m
Diameter = 0.01 m
Temperature = 298 K
Pressure = 101.32 kPa
The partial pressure of CO2 i.e [tex]p_{A1}[/tex] is 456 mm Hg at one end
To kPa, we have:
= [tex]456 \times \dfrac{101.325}{760}[/tex]
= 60.795 kPa
The partial pressure of CO2 i.e. [tex]p_{A2}[/tex] at the other end is 76 mm Hg
To kPa; we have
= [tex]75 \times \dfrac{101.325}{760}[/tex]
= 9.999 kPa
[tex]\simeq[/tex] 10 kPa
The diffusion coefficient of CO[tex]_2[/tex] in N[tex]_2[/tex] is 1.67 × 10⁻⁵
Universal gas constant = 8.314 J/mol/k
For equimolar counter-diffusion between the CO2 and N2 gases, the molar flux of CO[tex]_2[/tex] can be estimated by using the formula:
[tex]N_A = \dfrac{D_{AB}}{RT}(p_{A1} - p_{A2})[/tex]
replacing our values from the above parameters then:
[tex]N_A = \dfrac{1.67 \times 10^{-5}}{8.314 \times 298 \times 0.2}(60.795 - 10)[/tex]
[tex]\mathbf{N_A = 1.71 \times 10^{-6} \ kmol/m^2.s}[/tex]
The density of rubbing alcohol is 0.785g/mL at 25℃.
Calculate the mass of 15.0 mL of the rubbing alcohol.
Calculate the volume of 15.0 g of the rubbing alcohol.
Answer: The temperature is there to confuse you on purpose. Density changes with temp, but in these type of problems, they mean nothing
Explanation:
The formula for density is mass per unit of volume.
[tex]D=m/v[/tex]
We dont have to do any conversions here so it boils down to division and multiplication.
[tex]0.785g/mL=mass/15mL\\0.785g/mL*15mL = mass\\=11.78 grams[/tex]
Now for the second part:
[tex]0.785g/mL=15g/volume\\15g/0.785g/mL = volume\\=19.11mL[/tex]
The statements in the table summarize what Johannes Kepler stated in the early 1600s about the motion of planets.
Kepler's Statements
The orbit of a planet around the sun is an ellipse.
As a planet orbits the sun, a line between the planet and the sun sweeps out equal areas during equal periods of time.
There is a mathematical relationship between the time it takes a planet to orbit the sun and the average distance the
planet is from the sun.
Over the last four hundred years, predictions based on his statements have proven true. Which best describes
Kepler's statements?
O hypothesis
O theory
law
explanation
Answer:
it's law
Explanation:
i got it wrong because i put the wrong answer but it was law or c
i hope this help's
Answer: ITS C
Explanation: Its C Laws
