Answer:
The medical philosophy of the ancient Greeks in which the state of health and disease was determined by the four body “humours”—blood, yellow and black bile, and phlegm—and their relationships with the four elemental humours—air, fire, earth and water. Segen's Medical Dictionary.
Explanation:
If the hydronium ion concentration of a substance is 1.0 X 10-6 M, what would be the pH of that substance??
Show/Describe your work.
please tell me which one?
Answer:
i think its c
Explanation:
TRUE OR FALSE? Alloys are used more than pure metals because they are generally softer and less likely to react with air or water.
Alloys are used much more than pure metals because they are generally stronger and less likely to react with air or water...
So I would say false
Analysis of the water content of a lake found in the desert showed that it contained 17.5 percent chloride ion, and has a density of 1.23 g/mL. What is the molarity of the chloride ion in the water
Answer:
The molarity is 6.0 M.
Explanation:
The concentration of a solution is the amount of solute present in a given amount of solvent, or a given amount of solution.
In this problem, we are asked to convert percent by mass to molarity, which are two different concentration units.
The percent by mass is the ratio of the mass of a solute to the mass of the solution, multiplied by 100 percent. On the other hand, molarity (M) is defined as the number of moles of solute per liter of solution.
If we have 17.15 percent chloride ion, that means that we have 17.15 grams of chloride ion in 100 grams of solution. The density provided is the density of the solution, so we calculate how many mL correspond to 100 grams of solution:
1.23 g ----------- 1 mL
100 g ------------ x= 81.3 mL
Therefore, 17.5 grams of chloride ion are contained in 81.3 mL. Now we need to convert these grams into moles.
The atomic mass of chlorine is 35.5 g/mol:
35.5 g --------------- 1 mol
17.5 g --------------- x= 0. 49 mol
This 0.49 moles are contained in 81.13 mL, the definition of molarity says that this moles are contained in a liter (or what is the same, 1000 mL):
81.3 mL --------------- 0.49 mol
1000 mL ------------- x= 6.0 M
The molarity of the chloride ion will be 6.0 M.
What total volume of ozone measured at a pressure of 24.5 mmHg and a temperature of 232 K can be destroyed when all of the chlorine from 15.5 g of CF3Cl goes through 10 cycles of these reactions
Answer:
[tex]1.75272\ \text{m}^3[/tex]
Explanation:
The breakdown reaction of ozone is as follows
[tex]CF_3Cl + UV \rightarrow CF_3 + Cl[/tex]
[tex]Cl + O_3 \rightarrow ClO + O_2[/tex]
[tex]O_3 + UV \rightarrow O_2 + O[/tex]
[tex]ClO + O \rightarrow Cl + O_2[/tex]
It can be seen that 2 moles of ozone is required in the complete cycle
So for 10 cycles, 20 moles of ozone is required
m = Mass of [tex]CF_3Cl[/tex] = 15.5 g
M = Molar mass of [tex]CF_3Cl[/tex] = 104.46 g/mol
P = Pressure = 24.5 mmHg
T = Temperature = 232 K
R = Gas constant = [tex]62.363\ \text{L mmHg/K mol}[/tex]
Number of moles is given by
[tex]n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{15.5}{104.46}\\\Rightarrow n=0.1484\ \text{moles}[/tex]
[tex]20\ \text{moles} = 20\times 0.1484 = 2.968\ \text{moles}[/tex]
From ideal gas law we have
[tex]PV=nRT\\\Rightarrow V=\dfrac{nRT}{P}\\\Rightarrow V=\dfrac{2.968\times 62.363\times 232}{24.5}\\\Rightarrow V=1752.72\ \text{L}=1.75272\ \text{m}^3[/tex]
For 20 cycles of the reaction the volume of the ozone is [tex]1.75272\ \text{m}^3[/tex].
The Total volume of Ozone measured is = 1.7527 m³
Given data :
Mass of CF₃Cl = 15.5 g
Molar mass of CF₃Cl = 104.46 g/mol
Pressure ( P ) = 24.5 mmHg
T = 232 K
Gas constant ( R ) = 62.363 L mmHg/K mol
Note : For a complete ozone cycle 2 moles of ozone is required therefore for 10 cycles 20 moles of ozone will be required
First step : Determine number of moles in each cycle reaction
n = m / M ----- ( 1 )
m = mass = 15.5 g
M = molar mass = 104.46 g/mol
∴ n = 15.5 / 104.46 = 0.1484
Hence the number of moles in 10 cycle = 20 * 0.1484 = 2.968 moles
Next step : Apply Ideal gas law to determine the volume of Ozone
PV = nRT ----- ( 2 )
n = 2.968
V = ?
R = 62.363 L mmHg/K mol
T = 232 K
P = 24.5 mmHg
∴ V = nRT / P --- ( 3 )
= ( 2.968 * 62.363 * 232 ) / 24.5
= 1752.72 L ≈ 1.7527 m³
Hence we can conclude that the Total volume of Ozone measured is = 1.7527 m³
Learn more : https://brainly.com/question/20335707
What type of bond would be expected between Mg and Ti?
A.hydrogen bond
Bionic bond
C.covalent bond
D.metallic bond
Which energy transformation produces electricity and is least likely to negatively impact the environment?
Generating electricity from a natural gas-fired power plant
Generating electricity from a natural gas-fired power plant
Generating electricity from a coal-fired power plant
Generating electricity from a coal-fired power plant
Generating electricity from a nuclear power plant
Generating electricity from a nuclear power plant
Generating electricity from a solar panel system
Generating electricity from a solar panel system
electricity from solar panels
Explanation:
All other options produce something after or during the time electricity is made. That something is gas. Not solar
formal charge of hcooh
Answer:
What is the question?
1. How many energy sublevels are in the second principal energy level? 4 3 1 2
Answer:
2
Explanation:
What is the density of a glass piece that has mass of 18 g and a volume of 24 mL?
Answer:
The answer is 0.75 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{18}{24} = \frac{3}{4} \\ [/tex]
We have the final answer as
0.75 g/mLHope this helps you
25. Which of the following statements concerning atomic structure is/are correct?
1. The nucleus contains most of an atom's mass.
2. The nucleus contains all the positive charge of an atom.
3. Electrons surround the nucleus and account for the majority of an atom's volume.
1 only
2 only
3 only
2 and 3
1, 2, and 3
Answer:
It would be 2 and 3
The image shows the structure of an atom, I hope it helps :)
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option 2,3.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The nucleus contains all the positive charge of an atom. Electrons surround the nucleus and account for the majority of an atom's volume.
Therefore, the correct option is option 2,3.
To know more about atom, here:
https://brainly.com/question/13518322
#SPJ2
20 POINTS
What is true about the Sun, light bulbs, and flames?
AThey are all made of fire.
BThey are all made by people.
CThey are all found in nature.
DThey are all sources of light energy.
Answer:
D
Explanation:
Light blubs are not made of fire.
The sun wasnt made by humans.
You cant find Light bulbs in nature.
Meaning it is D.
What volume. In liters, of H2O(g) measured at STP is produced by the combustion of 15.63 g of natural gas (CH4) according to the following equation? CHale) +20269) CO2 + 2H2008)
Answer:
V = 43.95 L
Explanation:
Given data:
Mass of CH₄ decomposed = 15.63 g
Volume of H₂O produced at STP = ?
Solution:
Chemical equation:
CH₄ + 2O₂ → 2H₂O + CO₂
Number of moles of CH₄:
Number of moles = mass/molar mass
Number of moles = 15.63 g/ 16 g/mol
Number of moles = 0.98 mol
Now we will compare the moles of H₂O with CH₄.
CH₄ : H₂O
1 : 2
0.98 : 2×0.98 = 1.96 mol
Volume of hydrogen:
PV = nRT
1 atm × V = 1.96 mol × 0.0821 atm.L/mol.K × 273.15 K
V = 43.95atm.L / 1atm
V = 43.95 L
A scientist who collects and analyzes DNA from a crime scene is a
Answer:
forensic scientist
Explanation:
forensic science is the discipline in which professionals use scientific means to analyze physical crime evidence. this evidence is then presented in court in order to help determine the innocence or guilt of a specific suspect.
Answer:
Its a forensic scientist :D
Explanation:
I took a test and got it wrong but it showed the right answer and its a forensic scientist
(don't ask how i got it wrong i was rushing!!)
A beverage manufacturer wants to increase The solunility of carbon dioxide in its carbonated drinks as beverages produced which action will increase the solubility of CO2 gas the most
A. Decreasing the pressure on it
B. Increasing stirring
C. Decreasing its temperature
D. Increasing its temperature
Answer: C
Explanation:
1 point
Which element requires the least amount of energy to remove its valence electron(s)?
barium
chlorine
oxygen
carbon
Why do gases diffuse more quickly than liquids?
Choose the correct answer.
A) Liquids can be compressed easily.
B)The particles in gases are not mobile.
C)Liquids are always at lower temperatures than gases.
D)Gas particles move rapidly and have space between them.
Answer:
D)Gas particles move rapidly and have space between them.
Explanation:
Matter exists in three states namely: solids, liquids and gases. The particles contained in these three states are different from one another. In the gaseous state, the particles are FAR APART from one another i.e. space exists and they move at a very fast rate in contrast to the particles of a liquid, which have less space and move slower.
This rapid movement of gas particles within a less restricted space accounts for the reason why gaseous substances DIFFUSE more quickly than liquids.
When a material gains thermal energy and melts, it is undergoing a physical change.
Answer:
True, it undergoes a physical change.
Explanation:
A physical change is a change that does not change the chemical makeup of a material. This includes altering its shape.
What is the specific rotation of a sample of carvone that is an equal mixture of the R and S enantiomers
Answer:
Zero
Explanation:
An an equal mixture of the R and S enantiomers of carvone is called a racemic mixture.
In a racemic mixture, the R enantiomer rotates plane polarized light in one direction while the S enantiomer rotates plane polarized light in another direction.
This cancels out the rotation due to each enantiomer since they are equal in magnitude but opposite in direction leading to a specific rotation of zero for the racemic mixture.
what elements make up duralumin( an alloy)?
Answer:
In addition to aluminium, the main materials in duralumin are copper, manganese and magnesium.
Answer:
The original composition has been varied for particular applications; it may contain about 4 percent copper, 0.5–1 percent manganese, 0.5–1.5 percent magnesium, and, in some formulations, some silicon.
The atomic masses of 20Ne (90.48 percent), 21Ne (0.27 percent), and 22Ne (9.25 percent) are 19.9924356, 20.9938428, and 21.9913831 amu, respectively. Calculate the average atomic mass of neon. The percentages in parentheses denote the relative abundance
Answer:
20.180042 amu
Explanation:
From the question given above, the following data were obtained:
Isotope A (20Ne)
Mass of A = 19.9924356 amu
Abundance (A%) = 90.48%
Isotope B (21Ne):
Mass of B = 20.9938428 amu
Abundance (B%) = 0.27%
Isotope C (22Ne):
Mass of C = 21.9913831 amu
Abundance (C%) = 9.25%
Average atomic mass of Neon =.?
The average atomic mass of Neon can be obtained as follow:
Average atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100] + [(mass of C × C%)/100]
= [(19.9924356 × 90.48)/100] + [(20.9938428 × 0.27) /100] + [(21.9913831 × 9.25) /100]
= 18.0891557 + 0.05668338 + 2.03420294
= 20.180042 amu
Therefore, the average atomic mass of Neon is 20.180042 amu
7th grade help me plzzzz
Answer:
B & A
Explanation:
A Compound consists of two or more atoms from different elements, that are chemically bound together.
A electron carries a negative charge, because it is found in the electron cloud
If your wondering too, A proton carries A Positive charge.
Answer:
2 or more atoms from different elements that are chemically bonded together.
negative charge.
At which temperature can water contain the most
dissolved sugar?
Answer:
At 10ºC or 50ºF water can cotain the most dissolved sugar.
All the following are physical properties of metals EXCEPT
a. malleability
c. conductivity
b. brittleness
d. ductility
Explanation:I think it's option b) brittleness
I hope this might help u
The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below. Which of these elements is in this group?
Characteristics of a group of elements
•is shiny
•is solid at room temperature
•has atoms with two valence electrons
A-silicone
B-lithium
C-strontium
D-aluminum
Answer:
C:Strontium
Explanation:
Order the relative rate of diffusion of the following gases from slowest to fastest
Answer:
Kr, Ar, Ne, N
Explanation:
Hope this helps
PLEASE HELP IM TIMED
Which of the following is not an oxidation-reduction reaction?
Upper X e upper F subscript 6 (s) right arrow upper X e upper F subscript 4 (s) plus upper F subscript 2 (g).
2 upper C s (s) plus upper I subscript 2 (g) right arrow 2 upper C s upper I (s).
2 upper H subscript 2 upper S upper O subscript 4 (a q) plus 2 upper B a (upper O upper H) subscript 2 (a q) right arrow 2 upper B a upper S upper O subscript 4 upper H subscript 2 upper O (l).
Upper Z n (s) lus 2 upper A g upper N upper O subscript 3 (a q) right arrow upper Z n (upper N upper O subscript 3) subscript 2 (a q) plus upper A g (s).
Answer: choice 2
Explanation:
If a catalyst lowers the activation energy, what raises the activation energy?
heat
a reaction
another catalyst
an inhibitor
Answer:
an inhibitor
Explanation:
An inhibitor will raise the activation energy of a chemical system because it works in the opposite way a catalyst works.
A catalyst is any chemical substance the increases the rate of chemical reaction. They simply bind the substrate and bring them into reaction instead of passing through the high energy peaks.
An inhibitor works in an opposite way. They raise the activation energy of a reaction and prevents a reaction from taking place.
Answer:
An inhibitor
Explanation:
i did this on edge2020
have a good day
What is the formula mass for (NH4)2C2O4
Answer:
124.1 g/mol
Explanation:
just facts
Answer:
124.1 g/mol
Explanation:
To calculate formula mass, multiply the subscript of each element in the formula by the element's atomic weight (relative atomic mass) found on the periodic table. The unit for formula mass is either u or Da (Daltons).
PLEASE HELP ME! I am confused on this.
Answer:
Mohammed has less kinetic energy
Explanation:
m=Kg
V= m/s
KE= kinetic energy = J
the way you work out the answer is:
KE = 1/2 × m × v squared