Why are the melting and boiling points of an
element or a compound are called its fixed points.
Substances having fixed chemical proportions will have fixed boiling and melting points. This is the reason that Pure substances have specific melting and boiling points because their chemical proportions are fixed. Mixtures melt and boil over a range of temperatures
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Why is it important to be careful when walking on an icy sidewalk?
Ice moves faster than you do.
There is less friction on an icy surface.
Ice is heavier than you, so it is a greater force.
none of the above
Answer:
The is less friction on an icy surface
Explanation:
This is because when u walk on plain ground there is steady friction on the surface but when u walk on an icy floor these is barely any friction which is why it's hard to walk on.
Answer:
There is less friction on an icy surface.
Hope that helps.
Explanation:
if a substance has a normal boiling point of 50 °c, what can you state about the vapor pressure of the same substance at 40 0 °c?
most common elements that bond with oxygen
Explanation:
most common elements that bond with oxygen is Hydrogen (H2) to form water
Does the amount of mentos affect the height of the pop explosion
Answer:
no
Explanation:
bcuz science
Answer:
The more mentos you put in a bottle of pop does not necessarily mean a larger explosion. The max amount of mentos with the largest explosion was 4 mentos, it went 350 cm high. With 5 or 6 mentos the explosion went only 330 and 310 cm high.
Hope this helped in some way?
which of the following best describes a single replacement reaction?
two elements combine to form a compound
one element takes the place of another in a compound
two elements switch places in a compound
a compound breaks into separate elements
Answer:
One element takes the place of another in a compound
Explanation:
I just took a test for it and got it right. :)
Hope This Helps :)
Explain what happens to water during electrolysis. Is this a chemical reaction or phase change?
By definition, electrolysis is the use of an electric current to cause a chemical reaction which wouldn't otherwise happen. In a chemical change, bonds are either broken or formed. Electrolysis is a chemical change because, in the process of electrolysis, bonds are broken or formed.
Which subatomic particles have a positive charge and are located in the nucleus?
a. neutrons
b. atoms
c. electrons
d. protons
Answer: protons
Explanation:
a) Neutrons are located in the nucleus but have a negative charge.
b) Atoms are not subatomic particles but are rather made of subatomic particles.
c) Electrons are subatomic particles with a negative charge that are located outside of the nucleus.
d) Protons are subatomic particles that are located in the nucleus and have a positive charge.
arrange the compounds from lowest boiling point to highest boiling point.
Answer:
ion- ion> H - bonding > dipole > dipole> london dispersion
can someone please explain how to find an emperical formula given mass not percentage?
Answer:
1. Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages). ...
2. Convert the mass of each element to moles. ...
3. Find the ratio of the moles of each element. ..
4. Use the mole ratio to write the empirical fomula
Answer:
Multiply each result by the given mass.
Explanation:
Hi!
In order to find percent/mass composition you would
1. write the formula
2. calculate the molar mass for each equation
3. add all the masses to get the compound molar mass
4. divide each molar mass by the total mass
and then for mass composition, you would multiple eachy result by the given mass.
For example;
Calculate the number of grams of gold in 89.6 grams of gold(1) perchlorate.
Your formula would be AuClo4
Au : 196.96 x 1
Cl: 35.4 x 1
O: 16 x 4
Add the masses together to get 296.5 g/mol
Lets say we're looking for Oxygen. You would take what you got (16 x 4) and divide it by the total mass. 64/296.5
This would equal 0.215. Instead of multiplying this by 100 like you would for percent, for mass you would multiply by what is given. in this instance it is 89.6.
0.215 x 89.6 = 19
But the question is asking for gold,
197/296
= 0.664 x 89.6
= 59.5
Your answer would be 59.5 grams Au
Hope this helped! : D
What is the process that results in the formation of an ion
Examples of errors in colorimetry experiments
Answer:
The lack of accuracy and underestimation of absorbance readings obtained from the colorimeter can be contributed to many experimental factors. One plausible error is from the imperfection of the absorber, in that it may not completely absorb the stray light passing by the perimeters of the photoresistor.
Explanation:
In practice there are other sources of error, such as environmental effects on photometer and sample, temperature, line voltage fluctuations, vibrations, contamination, or heating of the sample by the photometer. All these factors may impair the measured result, and ways and means are known to test and eliminate them.
explain a mixture of molecules
Answer:
A mixture of molecules is a group of molecules in which there are multiple different elements and atoms, that are in either fixed proportions or random. There are heterogeneous and homogenous mixtures.
Explanation:
Which is the correct measure of density?
Cm^2/g
g/cm^3
cm^3/g
mass x volume
Answer:
g/cm^3
Explanation:
Density= m/v
gram is a measurement of mass
cm^3 is a measurement of volume
Hope this helps:) Have a good day!
What is the Lewis structure for Iodide?
Answer:
In the Lewis structure for IF5 you'll need to put a total of 12 valence electrons on the Iodine atom in order to draw the Lewis structure. Remember that Iodine (I) can hold more than eight valence electrons. For the IF5 Lewis structure, calculate the total number of valence electrons for the IF5 molecule
Explanation:
I be knowing hope this helps
Fill in the blank:
A correctly written hypothesis uses an ____ ______ statement
Answer:
a theory of a experiment and the experiment acts like a judge determining if the hypothesis is right or wrong from the final test result
Explanation:
What is the significance of cell division?
A. to make ATP
B. to prevent replication
C. to repair and replace other cells
D. to make glucose
where does oxidation occur in an electrochemical cell
Two samples of solids have similar reactivity with acids and similar densities. Their masses
and volumes, however, are not at all similar. Is it possible that these are the same
substance? (1 point)
O. No, it is not possible because they have different extensive properties.
O Yes, it is possible because they have similar intensive properties.
O Yes, it is possible because they have similar extensive properties.
O No, it is not possible because they have different intensive properties.
They may be the same substance even though they have different volumes and masses.
Intensive properties are the properties are characteristic a substance. Intensive properties are those properties of a substance that can be used to describe the substance.
We can see that the substances have similar reactivity and similar density. This means that they may be the same substance even though they have different volumes and masses.
The correct option is; "Yes, it is possible because they have similar intensive properties."
Learn more: https://brainly.com/question/17323212
what is the three-dimensional coordination number of the face-centered cubic arrangement?
The three-dimensional coordination number of the face-centered cubic arrangement has a coordination number of 12 and contains 4 atoms per unit cell.
What is coordination number ?The coordination number, also known as ligancy, of a central atom in a molecule or crystal is the sum of all the atoms, molecules, or ions that are linked to it. This value is used in crystallography and materials science. A ligand is the ion, molecule, or atom that surrounds the center ion, molecule, or atom.
The number of atoms, ions, or molecules that a central atom or ion bears in a complex or coordination compound or in a crystal as its near neighbors is known as the coordination number, also known as ligancy.
In contrast to oxidation state, which is a number assigned to an element in chemical combination and represents the number of electrons lost or gained by an atom of that element in the compound, co-ordination number is the number of co-ordination bonds with which the ligands are bound to the central ion.
Thus, the face-centered cubic arrangement has a coordination number of 12 and contains 4 atoms per unit cell.
To learn more about coordination number, follow the link;
https://brainly.com/question/16882931
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Find the molar mass of iron (III) nitrate, Fe(NO3)3
Answer:
Hey there are you doing are you doing I will tell you the answer
according to the arrhenius concept, if naoh were dissolved in water, it would act as
Answer:
base
Explanation:
The substance NaOH will be disassociated in ions of Na and OH.
Ahrrenius concept of base it's anything that dissolved in water produces OH.
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Answer:
If it becomes buried deep into the earth and it is open to increased temperate and pressure. Then an Igneous rock could be Metamorphic. This process can take a lot of time but eventually the rock will change due to pressure andbhigher temperatures.
If you run a refrigerator in a closed room with the refrigerator door open,the room temperature willA) increase.B) decrease.C) remain unchanged.
Answer: A increase
Explanation: The temperature of room will increase. If a refrigerator door is open then more flow rate of coolant is required in order to maintain lower temperature So the compressor will be running continuously also heat exchange happening through condenser increases the room temperature rather than decreasing.
What halogen can react with sodium chloride solution to produce chlorine?
Answer:
As electro-negativity decreases from Florine to downwards in the group and only Florine is above Chlorine, so Florine should react with sodium chloride solution to produce chlorine.
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Please help me, trying to get all my hw done
Answer:
C. size and shape
Explanation:
Physical properties such as size, shape, color, density, magnetism or the
ability to sink or float can be used to separate the substances in a mixture..
Filtration is when matter is passed through a filter and the larger particles
are separated out. Magnets can be used to separate magnetic matter from
non-magnetic matter in a mixture. Objects that float when placed in water
can be separated from those that don’t by placing the mixture in water.
how do particles in the most rigid state of matter move
Explanation: In solids, particles are very closely packed in an orderly arrangement in a lattice and only vibrate in fixed positions. The forces of attraction between them are very strong. This allows them to overcome the forces of attraction that hold the other phases closer together
Maximum s-character is observed in
a) Triple bonded carbon atom b) Double bonded carbon atom
c) Single bonded carbon atom d) Carbon atom of benzene
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Maximum s-character is observed ina) Triple bonded carbon atomWrite the complete electron configuration using the diagonal rule for strontium.
5 Stoichiometry Chemistry questions !
1. Determine the mass in grams of lithium hydroxide produced when 0.38 g of lithium nitride reacts. g LiOH
Li3N(s) + 3 H2O(l) --> NH3(g) + 3 LiOH(aq)
2. How many moles of sodium chloride are produced when 2.9 grams of sodium iodide reacts? mol NaCl
2 NaI(s) + Cl2(g) --> 2 NaCl(s) + I2(g)
3. What volume in liters of chlorine gas at STP would be required to fully react with 125 g of NaI? L Cl2
2 NaI(s) + Cl2(g) --> 2 NaCl(s) + I2(g)
4. Determine the volume in liters of carbon dioxide produced at STP when 0.85 grams of butane (C4H10) reacts. L CO2
2 C4H10(l) + 13 O2(g) --> 8 CO2(g) + 10 H2O(g)
5. Calculate the mass in grams of water vapor produced by the combustion of 51.3 L of propane, C3H8, at STP. g H2O
C3H8(g) + 5 O2(g) --> 3 CO2(g) + 4 H2O(g)