Answer:
Melting
Explanation:
Which of the following statements is FALSE?
Compounds are combinations of different elements found on the Periodic Table
Elements are composed of two or more compounds
Elements are the building blocks of compounds
O
Elements and compounds are both types of pure substances
What unusual characteristic of water gives it this relatively unique phase diagram? Explain. (Hint: think about molecular structure of solid and liquid water.)
Answer:In water's diagram, the slope of the line between the solid and liquid states is negative rather than positive. The reason is that water is an unusual substance in that its solid state is less dense than the liquid state.
Explanation:
help meeeeeeeeeeeeeeeeeeeeee
Answer:
Formula of water:H2O
Formula of potassium chloride:KCl
What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20°C to 35°C?
Answer: 4707 J
Explanation:
NaHCO3(s) + HCl(aq) — NaCl(s) + H2011) + CO2
teacher reacts 84. 0 g of sodium bicarbonate with excess hydrochloric acid. What is the
percent yield for sodium chloride if 56. 0 g of sodium chloride is produced?
What is the chemical formula of the phosphate ion?.
Answer: PO43
Explanation: The structure and formula are as follows: The chemical structure of phosphate is PO43-.
The molecular mass is 94.97 g/mol.
why neon is special from other chemical elements
Answer: it has full valence shells
Explanation: Hope this is it
Answer:
Neon, along with helium, argon, krypton and xenon, make up the group known as noble gases. These are the most stable and least reactive elements due to having full valence shells (the outer shell has the max number of electrons, two for helium, eight for the rest).
Explanation:
Hope it helps
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Tori
How does an indicator differentiate between an acid and base?
Changes solubility
Changes reactivity
Changes color
Changes size
Answer:
that is all I know sorry hope that may help you :)
Explanation:
Indicator is a substance which shows different colors in acidic and basic medium. Indicators can be natural (derived from natural sources) or artificial ( man-made) for example :
*Litmus is an indicator. Acid turns blue litmus into red while base turns red litmus into blue
* Turmeric solution does not show change in color (remains yellow) in acidic solution and turns red in basic solution.
what is the total ionic and net ionic equation for for the reaction between between mercury (II) nitrate and iron (III) chloride.
Answer:
Hg+2 + 2Cl- -> HgCl2
HOPE THIS HELPS HAVE A GREAT DAY/NIGHT!!~
Explanation:
Which postulate of daltons atomic model was later changed and why
For a research project on time management, Yuri needs to calculate how many hours the average high school student spends in school each year. Which of these dimensional analysis equations is the correct one for him to use?
Answer:
7 hours……….5 days……….36 weeks
————- X ————— X ———————
1 day…………..1 week…………..1 year
how many hours per year does a high school student spend in school?
1260 hours per year
Explanation:
Answer:
7 hours...............5 school days.......36 school weeks
-------------------X-----------------------X---------------------------
1 school day......1 school week.......1 school weeks
1,260 hours per week
Explanation:
edge 2023
A gas has a temperature of 56.5°C. What is the temperature in K?
Answer:
329.65 K
Explanation:
56.5°C + 273.15 K= 329.65 K.
Hope this helps, good luck!
Why are engineers an important part of the space exploration team?
----------------------
OPTIONS:
A) They use state-of-the-art technology.
B) They use the information that astronauts gather to make advancements in other fields of science.
C) They design and build spacecraft, space vehicles, and satellites.
D) They help astronauts train for weightlessness and spacewalks.
What are 2 instruments used to test for conductivity
Answer:
Your answer is probe and a meter.
Explanation:
Hope it helps
Good Luck
Where does the energy generated by hydroelectric dams come from?
• A. Earth's internal heat
B. Fossil fuels
C. Flowing water
D. Fission reactions
Answer:
The answer would be C. Flowing water is where you get energy from hydroelectric dams.
I need help in this question pleaaaaase!
The correct definition of oxidation in terms of oxygen, electron and hydrogen is added, lost , lost, (Row B).
What is an oxidation reaction?An oxidation reaction is a reaction in which the oxidation number if the reacting species increases in a positive direction.
Oxidation can be defined in terms of oxygen as the addition of oxygen. Oxidation can be defined in terms of electron as removal of electron Oxidation can be defined in terms of hydrogen as removal of hydrogen.Therefore, the correct definition of oxidation in terms of oxygen, electron and hydrogen is added, lost , lost, (Row B).
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why don't we have a lunar eclipse every month?
PLEASE HURRY
Answer:
Beacause it does just in a different place
Explanation:
Because the Earth's orbit around the sun differs from the Moon's orbit around the Earth, lunar eclipse don't happen every month.
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sneksks ansia soaks s
Answer:
hamburger
yes yes
Explanation:
none lol
What is the wavelength of a photon with an energy of 4.56 x 10-19 J?
• A. 502 nm
• B. 436 nm
C. 688 nm
D. 460 nm
Answer:
B
Explanation:
We can use Planck's equation. Recall that:
[tex]\displaystyle E = h\nu[/tex]
Where h is Planck's constant and ν is the frequency.
We also have that:
[tex]\displaystyle \lambda \nu = c[/tex]
Where c is the speed of light and λ is the wavelength. Hence:
[tex]\displaystyle \nu = \frac{c}{\lambda}[/tex]
Therefore:
[tex]\displaystyle E= h\left(\frac{c}{\lambda}\right)[/tex]
Solving for λ yields:
[tex]\displaystyle \lambda = \frac{hc}{E}[/tex]
Hence substitute. Recall that h = 6.626 × 10⁻³⁴ Js and c = 2.998 × 10⁸ m/s:
[tex]\displaystyle \begin{aligned} \lambda & = \frac{(6.626\times 10^{-34}\text{ Js})(2.998\times 10^8\text{ m/s})}{4.56\times 10^{-19} \text{ J}} \left(\frac{1\times 10^9\text{ nm}}{1\text{ m}}\right) \\ \\ & = 436\text{ nm}\end{aligned}[/tex]
In conclusion, our answer is B.
calculate the molar solubility of ca(oh)2 in 0.10 m ca(no3)2 (ksp= 1.3x10^-6) in pure water
Ca(OH)₂⇒ Ca²⁺ + 2OH⁻
s s 2s
Ksp = [Ca²⁺][OH⁻]²
Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻
0.1 M 0.1 0.2
Input in Ksp
1.3 x 10⁻⁶ = 0.1 . 4s²
s² = 3.25 x 10⁻⁶
s = 1.8 x 10⁻³
1.8 x 10⁻³ is the molar solubility. Solubility is the amount of a substance that can be dissolved in a liquid to form a solution.
What is solubility?Solubility is the amount of a substance that can be dissolved in a liquid to form a solution; it is typically represented as grammes of solute every litre of liquid. One fluid's (liquid or gas) solubility in another can be entire (e.g., methanol and water are completely miscible) or partial (e.g., oil and water barely mix). Generally speaking, "like dissolves like" (for instance, the aromatic hydrocarbons dissolves in one another but not in water).
A material's solubility in two solvents is measured by the distribution coefficient, which is used in some separation techniques (such as absorption and extraction). In general, as temperature rises, so do the dissolution rates of solids in liquids, while they fall as temperature rises and rise with pressure for gases.
Ca(OH)₂⇒ Ca²⁺ + 2OH⁻
s s 2s
Ksp = [Ca²⁺][OH⁻]²
Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻
0.1 M 0.1 0.2
1.3 x 10⁻⁶ = 0.1 . 4s²
s² = 3.25 x 10⁻⁶
s = 1.8 x 10⁻³
Therefore, 1.8 x 10⁻³ is the molar solubility.
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What is the pH of a solution formed when 100 ML of an acid with a pH of two is diluted 1 L with pure water
Answer: look down hope I helped
Explanation:
1) First convert to pOH as OH is the dissociating species in a base equilibrium.pH + pOH = 14 (at 25 C)pH=13, hence pOH = 1,Hence [OH] = 10^-1 Mdiluting by factor of 10 with pure water gives [OH] = 10^-2 MThe new pOH = 2, hence the new pH is 12In general, dilution (with pure water) by a factor of 10 moves the pH 1 unit in the direction of the pH of water (pH 7). i.e. it moves up for acids, down for bases.(At infinite dilution of either acids or bases, you’d have pure water - obvious when you think of it like that)
At what pressure will 4.80 moles of fluorine gas have a volume of 60.0 liters and a temperature of 298 K?
The pressure of the given mol of fluorine as an ideal gas at the given temperature and volume is 1.96atm.
Ideal Gas LawThe Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.
It is expressed as;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )
Given the data in the question;
Amount of fluorine gas n = 4.80molesVolume V = 60.0LTemperature T = 298KPressure P = ?To determine the pressure of the fluorine gas, we substitute our values into the expression above.
PV = nRT
P = nRT / V
P = ( 4.80mol × 0.08206Latm/molK × 298K ) / 60.0L
P = 117.378624Latm / 60.0L
P = 1.96atm
Therefore, the pressure of the given mol of fluorine as an ideal gas at the given temperature and volume is 1.96atm.
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While transferring naoh solution to the ph paper, you accidentally splash it onto your skin. check all actions you should take. tell your teacher right away. try to save the naoh for recycling purposes. neutralize by applying a small amount of acid (e.g., hcl). wipe the naoh with a paper towel and continue the experiment. rinse the exposed skin with water.
When NaOH solution is accidentally spilled on your skin while trying to transfer it into a pH paper, one should rinse the exposed skin with water.
How to deal with laboratory accidents?Chemical reagents can be found in the laboratory and are harmful to the human skin.
However, when transferring an alkaline solution of NaOH to the pH paper and one accidentally splashes it onto the skin, water should be poured to the affected part immediately.
The water washes away the chemical before it starts to have negative effect on the skin.
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Answer:
A) Tell your teacher right away
E) Rinse the exposed skin with water
Explanation:
edge 2022 <3
What is the role of conservation of momentum to your safety either as pedestrians or as motorist?
The role of conservation of linear momentum is important to your safety as a pedestrian or a motorist because you will avoid being hit by car.
Conservation of linear momentumThe principle of conservation of linear momentum states that the sum of the initial momentum of an isolated system is equal to the sum of the final momentum.
The role of conservation of linear momentum is important to your safety as a pedestrian or a motorist because you will avoid being hit by car which is in motion, knowing that impulse you will receive will be equal to the change in the momentum of the car.
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37L of carbon dioxide decomposes. what mass of carbon results?
PLEASE HELP <3
The mass of carbon that resulted from the decomposition of 37 L of carbon dioxide is 19.8 g
Balanced equationCO₂ —> C + O₂
From the balanced equation above,
1 L of CO₂ decomposed to produce 1 L of C.
Therefore,
37 L of CO₂ will also decompose to produce 37 L of C
How to determine mass of CarbonAt standard temperature and pressure (STP),
22.4 L = 1 mole of C
Therefore,
37 L = 37 / 22.4
37 L = 1.65 mole of C
Thus, the mass of Carbon can be obtained as follow:
Mole of C = 1.65 mole Molar mass of C = 12 g/mol Mass of C =?Mass = mole × molar mass
Mass of C = 1.65 × 12
Mass of C = 19.8 g
Thus, 19.8 g of carbon were obtained from the reaction.
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When CO2 and H2O react to form H2CO3, the number of bonds broken in H2O is ____ and in CO2 is _____. one; one
CO2 and H2O react to form H2CO3 and two bonds are broken each in CO and H2O to form H2CO3.
What is chemical bonding?Chemical bonding refers to the forces of attraction which hold atoms of the same or different elements together in order to form stable compounds or molecules .
Chemical bonding may be either ionic or covalent.
The greater the number of bonds in a compound, the more stable the compound.
During chemical reactions, bonds are broken and new binds are formed.
There are two bonds each in CO2 and H2O.
This, in the reaction between CO2 and H2O react to form H2CO3, , the number of bonds broken in H2O is two and in CO2 is two.
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The quantitative amount of charge separation in a diatomic molecule contributes to the dipole moment of that molecule. A. True B. False
Answer:
The answer is True.
Explanation:
The sentence above is true it all adds up.
HBr+ AI(OH)3 H2O + AIBr3
At room temperature most of ionic compounds are: a) amorphous solids (b) crystalline solids c) liquids (d) gases(
The ionic compound are crystalline solids at room temperature
Explanation:
they are quite strong because they contain strong ionic bonds
At the room temperature, ionic compound will be crystalline solids.
What is Ionic compound?
Ionic compounds are made up of ions kept together by the attraction of oppositely charged ions. One of the most well-known ionic compound is common salt (NaCl). Molecular compounds are made up of separate molecules that are bonded together through electron sharing.
What is crystalline solid?The elements of a crystalline solid are grouped in a tightly packed microscopic structure, generating a crystal lattice that stretches in all directions.
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How to know if a reaction is endothermic or exothermic.