The question is Given:Gas×Temperature×Pressure
Gas=1400ml
Temperature=20.00K
Pressure=101.3kpa
140ml×20.00K×101.3 K Pa
total =6,00.00
and when the volume of temperature changed to 40.00 K and the pressure is changed to 50.65 kPa.
Solution will 40.00 K× 50.65 kPa
total of the changes is 200.
Indicate whether solutions of the following salts would be acidic, basic, or pH-neutral.
a. NaNO3
b. Ba(C2H3O2)2
C. CH3NH3Cl
4. C6H5NH3CHO2
e. CoBr3
Answer is NH4NO3
YOU HAVE WRITTEN WRONG IN OPTION NO. A
EXPLANATION
HPO42- is an amphoteric ion. Is the Ka or Kb for this ion larger? (Hint: Consider
what its conjugate acid and conjugate base are in calculating the constants.)
Would you expect it to behave more like an acid or a base?
Sibce its Kb is larger than its Ka, the monohydrogen phosphate ion, HPO4^2- will behave more as a base than as an acid.
What is an amphoteric ion?An amphoteric ion is an ion that can act both as an acid or a base.
An example of an amphoteric ion is monohydrogen phosphate ion,
[tex]HPO_4^{2-}[/tex]
The Ka of monohydrogen phosphate ion is 4.8 × 10^-13 while the Kb is 1.6 × 10^-7.
The In is greater than the Ka.
Therefore, the monohydrogen phosphate ion, HPO4^2- will behave more as a base than an acid.
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Which statement is correct for the element of proton number 19?
A It is a gas that dissolves in water
B It is a hard metal that is not very reactive with water
C It is a non-metal that burns quickly
D It is a soft metal that is highly reactive with water
Answer:
D
Explanation:
From periodic table : proton number 19 corresponds to K (potassium)
which is very reactive with water
Which of the following is the lowest temperature?
O 330 K
O 48°C
O 64°F
Task
Determining Heat Gain and Loss
In this activity, you’ll heat an object in hot water and then transfer it to cool water. The object will become cooler, and the cool water will become warmer. Based on the temperature changes, you’ll calculate and compare the heat lost by the object and the heat gained by the water. To begin, choose an object (or objects) made of a known material and that can be immersed in water without causing damage.
Before you begin this task, read these lab safety guidelines. If you’re using an electronic balance, watch this video about measuring mass.
Estimated time to complete: 1 hour
If you’re using an Edmentum lab kit, remove the electronic balance and thermometer from the kit. These materials are italicized in the following equipment list. Then gather any additional items shown in the list. If you’re not using an Edmentum lab kit, alternatives are suggested in parentheses. If you don't have these alternative materials at home, please check with your teacher for help.
You’ll need these materials:
electronic balance (may also use a kitchen scale, readable at least to the nearest gram)
thermometer, readable at least to the nearest degree from 0°C to 100°C (32°F to 212°F)—readings to the nearest tenth of a degree will produce better results
foam cups (2)
lids to fit the cups (may use squares of cardboard as lids)
solid object (or group of objects) of a known material that can fit easily in the cup, ideally having a total mass of 25 to 60 grams; here are some ideas:
2–5 plastic dominoes, depending on size
5–10 glass marbles, depending on size
10 quarters
tongs
pen or marker
stove, hot plate, or microwave oven
container for heating water (depends on the selected heat source)
Part A
Begin the task by performing these steps. Record your observations in the table provided.
Label the foam cups with the numbers 1 and 2.
Record the type (and quantity, if applicable) of object you will be using. Include what kind of material the object is made of.
Determine the specific heat capacity of the chosen object from this list of specific heat capacities. If you can’t locate your material on the list, do an online search.
Use the electronic balance to measure the mass of the chosen object(s). Record the mass. Then, place the object(s) into cup 1.
Answer:
The water warms to a temperature of 28.1°C. Determine the specific heat capacity of the zinc. Now this 229.9 J is equal to the -Qmetal. The specific heat capacity of the metal can be calculated by setting -229.9 J equal to m•C•ΔT.
...
Heat and Changes of State.
Explanation:
2.0 moles of H3PO4 equals how many atoms of O
Considering the definition of compound, chemical formula and Avogadro's Number, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.
What is compound and chemical formulaIn a compound there are atoms of different elements joined by forces that we call chemical bonds.
The chemical formula indicates the number and type of different atoms present in the molecule.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Atoms of OIn this case, in 1 mole of the compound H₃PO₄ you have:
3 moles of H.1 mol of P.4 moles of O.Then, in 2 moles of H₃PO₄ you have 8 moles of O.
Now, you can apply the following rule of three: if by definition of Avogadro's number 1 mole of oxygen contains 6.023×10²³ atoms, 8 moles of oxygen contains how many oxygen atoms?
[tex]number of atoms=\frac{8 molesx6.023x10^{23}atoms }{1 mole}[/tex]
number of atoms= 4.8184×10²⁴ atoms
Finally, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.
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Which inner planet has 2 moons? Question 2 options: Mercury Venus Earth Mars
Answer:
Mars
Explanation:
neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons
Please answer this correctly!
A group of college students travel from Florida to Rome, Italy, on spring break. Which type of travel are they participating in?
A. Domestic
B. International
C. Local
D. Sustainable
Answer:
International is the answer duh
Name the following branched alkanes. Two of these are isomers of each other, put a star ★ in their boxes.
Answer:
square boxes
✪
Explanation:
if you like my answer
what are all the ways that you think knowing about the flow of energy might be useful in
thinking about the chemistry of Climate Change.
Yes the main benifit can be recyclation of energy
The example can be seen in powerbanks or invertersThe chemical energy present inside the battery can be used to convert itself into electric energy.Which can help us in climate protectionHow many moles would be present in 9.54x 1023 molecules of ammonia?
Avogadro's law states that in every mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] particles.
This means that in [tex]9.54 \times 10^{23}[/tex] molecules, there are [tex]\frac{9.54 \times 10^{23}}{6.022 \times 10^{23}}=\boxed{1.58 \text{ moles (to 3 sf)}}[/tex]
soil? Which organism in the tundra food chain would use this recycled matter?
of organisms and animal wastes.
A model of a shopping centre is drawn to scale where 1 cm on the model represent 4 m on the ground. Music shop Thabo's Sports Ware Fati's Clothing shop Grocery store PARKING Coffee shop Toilets Restaurant Shoe store Physiotherapy Health and Fitness center 1.1 Which shop is on the right of the physiotherapy? (2) 1.2 Describe the position of the Coffee Shop in relation to the Toilets. (2)
Oxygen always become negatively charged when it forms covalent bonds true or false?
Answer:
I think false
Explanation:
bcs oxygen can create good feeling in our body
What’s the solution to this
What would the charge on KAt be?
The overall charge of the given compound of potassium and Arsenic is zero (0).
What is the charge of an atom?
An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. When the number of protons exceed the number of electrons, the atom will positively charged and it will be negatively charged if the number of electrons exceed the number of protons.
For the given compound;
KAs; As (Arsenic = -3) + K (potassium = +3)KAs overall charge = -3 + 3 = 0Thus, the overall charge of the given compound of potassium and Arsenic is zero (0).
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what are the characteristics of binding energy
Explanation:
binding energy, amount of energy required to separate a particle from a system of particles or to disperse all the particles of the system. Binding energy is especially applicable to subatomic particles in atomic nuclei, to electrons bound to nuclei in atoms, and to atoms and ions bound together in crystals.
Write a conversion factor that converts between moles of calcium ions in calcium phosphide, Ca3P2, and moles of Ca3P2.
The conversion factor between moles of calcium ion and moles of [tex]Ca_3P_2[/tex] in [tex]Ca_3P_2[/tex] would be 3 to 1.
Mole fraction[tex]Ca_3P_2[/tex] if formed from 3 carbon atoms and 3 phosphate atoms according to the equation:
[tex]3Ca + 2P --- > Ca_3P_2[/tex]
Thus, there are 3 moles of calcium in every 1 mole of [tex]Ca_3P_2[/tex].
The conversion factor between moles of calcium and moles of [tex]Ca_3P_2[/tex] will. therefore, be 3 to 1 or simply 3:1.
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Which of the following is made of tissues and is part of an organ system?
The heart is made of tissues and is part of an organ system.
What is a tissue?Tissue is a group of cells that have a similar structure and that function together as a unit.
The cardiovascular system is the system responsible for delivering blood to different parts of the body.
It consists of the following organs and tissues: The heart: A muscular pump that forces the blood around the body.
Hence, heart is made of tissues and is part of an organ system.
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What is the engine piston displacement in liters of an engine who’s displacement is listed as 430 in.²
For an engine whose displacement is listed as 430 in.², the engine piston displacement in liters is mathematically given as
PD= 7.37 L
What is the engine piston displacement in liters of an engine whose displacement is listed as 430 in.²?
Generally, the equation for the dimensional analysis method,\, we convert in to L is mathematically given as
l*(v/l)*l/v
Therefore, piston displacement
PD=(450 in3) . (1 dm3 / 61.024 in3) . (1 L / 1 dm3)
PD= 7.37 L
In conclusion, piston displacement
PD= 7.37 L
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calculate the molarity of 500.0 mL of solution in which 50.0g of HCL has been dissolved
[tex]\huge\underline\mathcal{\red{A}\blue{n}\pink{s}\purple{w}\orange{e}\green{r} -}[/tex]
Given - 500 mL of solution containing 50g waterTo calculate - molarity of the solutionWe know that ,
[tex]Molarity \: (M) = \frac{no. \: of \: moles \: of \: solute }{volme \: of \: solution} \\[/tex]
it can be seen that we aren't provided with the no. of moles of solute in the question.
So let's calculate it using the given formula ~
[tex]no. \: of \: moles \: of \: solute = \frac{given \: mass}{molar \: mass} \\ \\ \longrightarrow \: \frac{50}{36.5} \\ \\ \longrightarrow \: 1.37 \: moles \: ( \: approx \: )[/tex]
Also ,
we're given that volume of solution = 500 mL = 0.5 L
Substituting the values in the formula of molarity , we get
[tex]Molarity = \frac{1.37}{0.5} \\ \\ \bold{\implies \: \boxed{Molarity = 2.74M}}[/tex]
hope helpful ~
Help please I really don’t understand
How many moles of calcium do you have if you measure out 13.95 g of calcium?
Moles are the divisional of the mass and the molar mass. In 13.95 gms of calcium, there are 0.348 moles.
What are moles?In chemistry, moles are the measurement units that are used to estimate the small entities of the atoms or the molecules. Moles are calculated as:
Moles = mass ÷ molar mass
We know,
The molar mass of calcium = 40 gm/mol
The mass of calcium = 13.95 gms
Moles of calcium are calculated as:
Moles = 13.95 ÷ 40
= 0.348 moles
Therefore, in 13.95 gms 0.348 moles of calcium is present.
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(b) Washing soda crystals react with acid to give off carbon dioxide.
If you added some washing soda crystals to vinegar,
what would you see happening?
Net ionic equation for Calcium hydroxide reacting with ammonium Chloride?
Answer:
Ca(OH)₂ (aq) + 2NH₄Cl (aq) → CaCl₂ (aq) + 2NH₃ (g) + 2H₂O (l)
Ca²⁺ + 2OH⁻ + 2NH₄⁺ + 2Cl⁻ → Ca⁺² + 2Cl⁻ + 2NH₃ (g) + 2H₂O (l)
2OH⁻ + 2NH₄⁺ → 2NH₃ (g) + 2H₂O (l)
Explanation:
ca (OH)2 + 2NH4CL------> CACL2 + 2NH3 + 2H2O
Determine the oxidation number if each atom in the following compunds: sodium chloride and iron(||) oxide.
Explanation:
see the picture for the answer
Plate Boundaries and Movement report
Please help!!!!!!
The graph shows the change in concentration of one of the species in the reaction
A + B + C→D + E.
If the graph indicates the reaction rate, then the concentration of which species is plotted?
A
B
C
E
Answer:
E.
Explanation:
Look at change in concentration over time...is it increasing or decreasing? It is increasing right as you can see because it starts at 0 then increases and plataeus. What increases in a reaction, reactant or product? Products increase right cuz your reactants react with each other to make prodcuts.
At start of reaction you have no products (zero) thus this graph starts at 0. At end you have alot of product thus over time the concentration of product increases.
ABC are reactants their concentration should decrease over time
DE are products, they should increase as reaction goes on.
What is a standard solution?
Answer:
A standard solution is any chemical solution which has a precisely known concentration.
Sodium Chloride for example.
Explanation:
Answer:
A standard solution is solution containing precisely known concentration of an element or a substance
what force of attraction holds ionic compounds together
Answer:
electrostatic force
Explanation:
6. How many liters of 4.0 M solution can
be made using 8.0 mol of lithium
bromide?
8.0 mol of lithium bromide
4 M solution of lithium bromide requires 4 moles of the compound per liter
8 ÷ 4 = 2
answer is 2 Liters
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