Why can you see solids and liquids, but not most gases?
Why can gases and liquids be paired but not solids?
The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.
which an element that exist into two form
Answer:
Sulphur
Explanation
Rhombic and monoclinic sulphur are its allotropic forms
calculate the mass of Ag3AsO4 that would be produced if enough AgNO3 solution is added to precipitate all of the AsO43- in the 100.0 mL of the 0.1 M Na3AsO4 solution. Record this amount on your report sheet.
Answer:
5 g
Explanation:
Step 1: Write the balanced equation
3 AgNO₃(aq) + Na₃AsO₄(aq) ⇒ Ag₃AsO₄(s) + 3 NaNO₃(aq)
Step 2: Calculate the reacting moles of Na₃AsO₄
100.0 mL of 0.1 M Na₃AsO₄ react.
0.1000 L × 0.1 mol/L = 0.01 mol
Step 3: Calculate the moles of Ag₃AsO₄ formed from 0.01 moles of Na₃AsO₄
The molar ratio of Na₃AsO₄ to Ag₃AsO₄ is 1:1. The moles of Ag₃AsO₄ formed are 1/1 × 0.01 mol = 0.01 mol.
Step 4: Calculate the mass corresponding to 0.01 moles of Ag₃AsO₄
The molar mass of Ag₃AsO₄ is 461.61 g/mol.
0.01 mol × 461.61 g/mol = 5 g
HELP ME PLEASE
Over time, which cell will look the smallest?
A student places four identical cells into four different
liquids
Cell
cell W
cell x
cell Y
cell z
W:Saltier than the cell
X:Less salty than the cell
Y:Equally as salty as the cell
Z:Pure water with no salts
Answer:
This description can be expressed as follows:
Y > W > XY>W>X
And,
W=ZW=Z
From these expressions we are able to find out that the saltiest cell description is Y, while the less salty is X.
Now, salt is well known as a dehydrating agent. In a process called osmosis cells placed in a salty liquid environment lose water, how?
Well, cells have a semipermeable membrane, in which some substances can get inside. Cells also have water inside. If a cell is placed in a quite salty liquid environment, salt will make the water inside the cells to come out, drying the cell and diminishing its size.
So, in this case, according to the expressions above, Cell Y will look the smallest, while cell X will look the biggest.
If we pour pure water in each liquid, the salt concentration will change and each cell will begin to grow bigger, but the saltiest cell will still be smaller than the others with less salt concentration.
Finally, to answer the question: Y cell will look the smallest after this processIf 10.88 moles of NH3 were produced, how many moles of N2 would be
required?
Answer:
5.44 moles of nitrogen required.
Explanation:
Given data:
Number of moles of NH₃ = 10.88 mol
Moles of N₂ required = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Now we will compare the moles nitrogen and hydrogen.
NH₃ : N₂
2 : 1
10.88 : 1/2×10.88 = 5.44mol
5.44 moles of nitrogen required.
How did Mendeleev arrange the known elements in his periodic table? O A. According to the number of protons O B. According to the number of electrons O C. According to atomic mass O D. According to atomic number
Mendeleev arranged the known elements in his periodic table according to atomic number (option D).
What is the periodic table?Periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).
The chemical elements are organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson.
Dmitri Mendeleev is the Russian scientist that formulated the periodic table of chemical elements and arranged them in order of increasing atomic number.
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Answer: C.
Explanation:
according to atomic mass
how are the terms atom and element different?
Answer:
Element is made from same type of atoms
While atom is present in element made up of different particles like proton neutrons electron etc
Explanation:
If 8.50 g of phosphorus reacts with hydrogen gas at 2.00 atm in a 10.0-L container at 298 K, calculate the moles of PH3 produced as well as the total number of moles of gas present at the conclusion of the reaction.
Answer:
The moles of PH₃ produced are 0.2742 and the total number of moles of gas present at the end of the reaction is 0.6809.
Explanation:
Phosphorus reacts with H₂ according to the balanced equation:
P₄ (s) + 6 H₂ (g) ⇒ 4 PH₃ (g)
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
P₄: 1 moleH₂: 6 molesPH₃:4 molesBeing the molar mass of the compounds:
P₄: 124 g/moleH₂: 2 g/molePH₃: 34 g/moleThe following mass amounts of each compound participate in the reaction:
P₄: 1 mole* 124 g/mole= 124 gH₂: 6 mole* 2 g/mole= 12 gPH₃: 4 moles* 34 g/mole= 136 gAn ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
In this case you know:
P= 2 atmV= 10 Ln= ?R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= 298 KReplacing:
2 atm*10 L= n*0.082 [tex]\frac{atm*L}{mol*K}[/tex] *298 K
and solving you get:
[tex]n=\frac{2 atm*10 L}{0.082\frac{atm*L}{mol*K}*298 K }[/tex]
n=0.818 moles
The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
To determine the limiting reagent, you can use a simple rule of three as follows: if 6 moles of H₂ react with 124 g of P₄, 0.818 moles of H₂ with how much mass of P₄ will it react?
[tex]mass of P_{4}=\frac{0.818 moles of H_{2}*124 grams of P_{4}}{6 moles of H_{2}}[/tex]
mass of P₄= 16.90 grams
But 16.90 grams of P₄ are not available, 8.50 grams are available. Since you have less mass than you need to react with 0.818 moles of H₂, phosphorus P₄ will be the limiting reagent.
Then you can apply the following rules of three:
If 124 grams of P₄ produce 4 moles of PH₃, 8.50 grams of P₄, how many moles do they produce?[tex]moles of PH_{3} =\frac{8.5 grams of P_{4}*4 moles of PH_{3} }{124grams of P_{4}}[/tex]
moles of PH₃=0.2742
If 124 grams of P₄ react with 6 moles of H₂, 8.50 grams of P₄ with how many moles of H₂ do they react?[tex]moles of H_{2} =\frac{8.5 grams of P_{4}*6 moles of H_{2} }{124grams of P_{4}}[/tex]
moles of H₂= 0.4113
If you have 0.818 moles of H₂, the number of moles of gas H₂ present at the end of the reaction is calculated as:
0.818 - 0.4113= 0.4067
Then the total number of moles of gas present at the end of the reaction will be the sum of the moles of PH₃ gas and H₂ gas that did not react:
0.2742 + 0.4067= 0.6809
Finally, the moles of PH₃ produced are 0.2742 and the total number of moles of gas present at the end of the reaction is 0.6809.
The ideal gas equation gives the approximate amount of PH₃ produced
and the gas at the conclusion as 0.28 and 0.69 moles respectively.
Response:
First part:
The PH₃ gas produced is approximately 0.28 molesSecond part:
The number of moles of gas present at the conclusion of the reaction is approximately 0.69 molesWhat is the ideal gas equation, and how does it give the number of moles of gas present?Given:
Mass of phosphorus = 8.50 g
Pressure of hydrogen gas, P = 2.00 atm
Volume of hydrogen gas, V = 10.0–L
Temperature of the gas, T = 298 K
First part:
From the ideal gas equation, P·V = n·R·T, we have;
[tex]Number \ of \ moles, \ n = \mathbf{\dfrac{P\cdot V}{R \cdot T}}[/tex]
Where for the hydrogen gas, H₂, we have;
P = 2.00 atm
V = 10.0 L
T = 298 K
The universal gas constant, R = 0.08205 L·atm·mol⁻¹·K⁻¹
Which gives;
[tex]n = \mathbf{ \dfrac{2.00 \times 10.0}{0.08205 \times 298}} \approx 0.82[/tex]
The number of moles of H₂ in the reaction, n ≈ 0.82 moles
The equation of the reaction is; P₄(s) + 6H₂(g) [tex]\longrightarrow[/tex] 4PH₃(g)Therefore;
1 mole of P₄(s) and 6 moles of H₂(g) produces 4 moles of PH₃(g)
Molar mass of P₄ ≈ 123.9 g
Which gives;
Number of moles in 8.50 g of phosphorus = [tex]\frac{8.5}{123.9}[/tex] ≈ 0.069
0.069 moles of P₄ will react with 0.069 × 6 moles ≈ 0.41 moles of H₂ to produce 0.069 × 4 moles ≈ 0.28 moles of PH₃
Number of moles of PH₃ gas produced is approximately 0.28 molesSecond part:
The total number of moles of gas present at the conclusion of the reaction is therefore;
∑Gas ≈ 0.28 moles + (0.82 - 0.41) moles ≈ 0.69 molesLearn more about the ideal gas equation here:
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Which of the following is NOT a heterogenous mixture:
Salad
Beef Stew
Cereal in milk
Vinegar
Answer:Vinegar
Explanation:
(b) What is the solubility of lead chromate in moles per dmcube ksp
for PbC10,=2.8x10*-13 mole/dmº
The solubility of lead chromate : s= 5.29 x 10⁻⁷ mol/L
Further explanationGiven
Ksp for PbCl,=2.8x10*-13 mole/dmº
PbCrO4
Required
The solubility
Solution
P b C r O ₄ ( s ) ⇌ P b²⁺( a q) +C r O ₄ ⁻²( a q )
s s s
s= solubility
Ksp P b C r O ₄ = s²
K s p = [ P b ²⁺] [C r O ₄ ⁻² ]= 2.8x10⁻¹³
s = √2.8x10⁻¹³
s= 5.29 x 10⁻⁷ mol/L
Which of the following are examples of chemical energy being released or stored?
I. A car battery reacting and releasing energy
II. A girl eating a sandwich which helps her move
III. Propane burning on a barbecue
Answer:
it is all of the above
Explanation:
The volume of 2.050 M copper(II) nitrate that must be diluted with water to prepare 750.0 mL of a 0.8543 M solution is equal to mL. Report your answer to 4 significant figures in decimal notation (not scientific or exponential notation).
Answer:
312.5
Explanation:
The volume of 2.050 M copper(II) nitrate that must be diluted with water to prepare 750.0 mL of a 0.8543 M solution is equal to 312.5 ml.
What is volume?Volume is defined as a three dimensional quantity that is used to measure the capacity of a solid shape.
It is also defined as the measure of the capacity that an object holds.
M1V1 = M2V2
Here M1 = 2.050 M
M2 = 0.8543 M
V2 = 750 ml
So, V1 = M2V2 / V1
= 0.8546 M x 750 ml / 2.050
= 312.5 ml
Thus, the volume of 2.050 M copper(II) nitrate that must be diluted with water to prepare 750.0 mL of a 0.8543 M solution is equal to 312.5 ml.
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Select the correct answer.
Which of these activities increases the amount of carbon in the atmosphere?
O A.
animals eating plants
OB. burning of fossil fuels
OC. fossilization
O D.
photosynthesis
How many electrons will an Oxygen (O) atom gain or lose in forming an ion?
Answer:
two electrons.... oxygen needs two electrons to attain stability
All the radioactive elements are found in the last group of the Periodic Table.
True
False
Answer:
False
Explanation:
HELP ASAP PLS Is an oxygen ion and fluorine ion bigger and why?
Answer:
From top to bottom of the periodic table ions will increase in radii. However, now left to right the radius is more of a function of the number of electrons. ... Similarly, O2- will be larger than F- as both have 10 electrons but Z=8 for oxygen and Z=9 for fluorine.
The oxygen ion is bigger than the fluorine ion , the reason is explained below
What is an Atomic Structure ?
An atom is composed of electrons , protons and neutrons .
Electrons have negative charge and are grouped in different shells around the nucleus
Protons and neutrons are present in positively charged nucleus
The nucleus has the most mass .The atomic number is the number of protons which is equal to the number of electrons.
Both oxygen atom and fluorine atoms are isoelectronic , they have 10 electrons in the shell , but oxygen has 8 protons while fluorine have 9 protons in the nucleus.
It is believed that as the atomic number increases so the attraction forces of the nuclei increases , making the nucleus smaller and the overall atom smaller
while the oxygen atom on reduction forms oxide anion , which is a dianion and a fluorine atom forms fluoride ion which has a single negative charge and the ion which has more electrons have more electron electron repulsion and the size of the ion is bigger.
Hence the oxygen ion is bigger than the fluorine ion.
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Which of the following best describes a galvanic cell?
A. Abattery that requires energy to charge it
B. A battery containing an acid and a base
C. A battery containing a spontaneous redox reaction
D. A battery containing a nonspontaneous reaction
Answer:
Your answer is C
Explanation:
The option that best describes a galvanic cell is that a battery containing a spontaneous redox reaction. That is option C.
A Galvanic cell is simply defined as an electrochemical cell that uses the movement of electrons in a reduction-oxidation reaction to produce electrical energy for use.
A Galvanic cell is a battery and is made up of a conducting electrolyte solution and two halve cells which include:
one half-cell of metal A(anode) electrode andone half-cell of metal B(cathode) electrode.In the galvanic cell a spontaneous redox reaction occurs which involves the transfer of electrons from anode to cathode with the release of energy.
Therefore, the option that best describes a galvanic cell is that it is a battery containing a spontaneous redox reaction.
Balance the following chemical equation: CH4+ Cl2 → CCl4+ HCI
Explanation:
CH4+8/2Cl2—>CCl4+4HCl
that is,1molecule of methane+8/2 molecules of dichlorine—>1molecule of carbon tetrachloride+4molecules of hydrogen chloride
Why milk sours is chemical change ?
Answer:
Explanation:
So chemical changes require a change on a molecular level that cannot be reversed because they form some new substance. Souring milk is not something you can reverse, and the process of it souring produces new molecules.
Which metal will lose electrons more easily, Ca or Mg?
What is the definition of climate?
1) An area's long term weather pattern
2)When large air masses of different density, moisture, and temperature mee
3)The state of the atmosphere at a given place and time
4)Large volume of air that has similar characteristics of temperature and water
vapor content
Answer:
1) An area's long term weather pattern
Explanation:
Climate is defined as the weather pattern in an area for the long term. Climate means the usual condition of the humidity, temperature, wind, rainfall, and atmospheric pressure in the surface area of Earth for the long term. Usually the time period for a climate in a region is taken over 30-years.
Weather is the state of the atmosphere and climate the long-term weather pattern of the area. For example: degree to which it is hot or cold is weather and expect snow in the Northeast in every January is climate.
Hence, the correct answer is "1) An area's long term weather pattern".
When salt water is heated leaving behind solid salt, this is separating a mixture by what method ?
2
A sample of water has a volume of two liters and is shaped like a cylinder in one container. In a much larger container, the water
still has a volume of two liters, but it is shaped like a rectangle
What state of matter is the water in?
OA. Solid
OB. magnetic
OC. plasma
OD. liquid
Reset
Submit
Answer:
D. liquid
Explanation:
Matter, which is any substance that has weight and occupies space, can exists in three states namely: solid, liquid and gaseous. In this question, water is being described as matter.
According to this question, a sample of water of volume 2litres is shaped like a cylinder in one container and shaped like a rectangle in another larger container. Based on this observation, the water sample is in a LIQUID STATE because a liquid has no indefinite shape but takes the shape of its container.
Hence, this water sample, takes the shape of its cylindrical container in the first scenario and shape of its rectangular container in the second scenario.
Atoms are stationary and don't move when in solid form.
False
True
Answer:
True? The don't stay exactly still i dont think, but i'd say true.
Explanation:
Answer:
TRUE
Explanation:
In a solid, atoms are packed tightly together and move very slowly. In fact, they do not flow at all: they simply vibrate back and forth.
Key words vibrate, not movement.
Correct me if I'm wrong of course
Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Be sure the equation you submit is balanced. (You can edit both sides of the equation to balance it, if you need to.) Note: you are writing the molecular, and not the net ionic equation.
Answer:
Hydrogen chloride (HCl) and Calcium hydroxide (CaOH). (see balanced equation below)
Explanation:
In a neutralization reaction as is the case of the question (see attachment), an acid would be neutralized by a base to form salt and water.
The most plausible reactants for the reaction given the number of moles of the product, is therefore Hydrogen chloride (HCl) and Calcium hydroxide (Ca(OH)2).
[tex]HCl _{(aq)} + Ca(OH)_{2} _{(aq)}[/tex] →[tex]CaCl_{2}_{(s)} + H_{2} O_{(l)}[/tex]
Let me know if this was helpful.
pleaseee help thank youu
Answer:
i just took it the answers is C
Explanation:
Why is there no sound in outer space? PLEASE HELP IF YOU WANT BRAINLEIST AND A LIKE ON URE COMMENT!
A. The speed of sound is too slow for space.
B. There is no medium in which it can travel.
C. There are too many other noises.
D. There is only echolocation in space.
Answer:
B
Explanation:
Which of the following is a compound?
Gold
Silver
Carbon Dioxide
Lead
Answer:
Carbon dioxide
Explanation:
Because CO2
QUESTION 4
How many significant figures are in the number 0.000020?
O A. 1
OB.2
O C.3
OD.4
Answer:
B) 2
Explanation:
There are two significant figures in given measurement,
2, 0
Significant figures:
1= The given measurement have four significant figures 1534.
2= All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
3= Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
4= Zero between the non zero digits are consider significant like 107 consist of three significant figures.
5= The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
12. Which of these is a solution? *
Gold
Salt
Water
Carbonated Water
All of the above.
Answer:
carbonated water
remaining are single element