Answer:
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Answer:
use other websites u might have luck and find ur anwer
Explanation:
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Which of the following giant covalent structures does not have a high melting and boiling
point?
a) Polythene
b) Graphite
c) Silicon dioxide
d) Diamond
Answer:
Polythene has the lowest melting/boiling point from all the other covalent structures mentioned in this question.
Answer:
Polythene (polyethene according the IUPAC nomenclature.)
Explanation:
Consider the structure of each option:
Polythene: long chains of atoms that are able to rotate along the bonding axis. Graphite: layers of (hexagonal) carbon sheets; each individual sheet is rigid (allows no rotation.) Silicon dioxide: three-dimensional (tetrahedral) network of carbon and oxygen atoms; the entire network very rigid (allows no rotation.)Diamond: three-dimensional (tetrahedral) network of carbon atoms; likewise, the entire tetrahedral network is very rigid.Melting each structure requires overcoming the forces that hold the structure rigid:
In polythene, van der Waal forces hold the chains together and prevents rotations.Deshaping graphite requires bending the layers; doing so would require overcoming the covalent bonds within the hexagonal sheets.In silicon dioxide and diamond, deshaping the tetrahedral network also requires overcoming covalent bonds.Van der Waal forces are much easier to break than covalent bonds.
Hence, the melting point of polythene would be the lowest among the options.
How did President Wilson anger civil rights advocates?
Answer:
He put segregationists in charge of federal agencies...
Explanation:
...
Answer:
He placed segregationists in charge of federal agencies.
Explanation:
What does one mole of h20 correspond to
Answer:
One mole of H2O corresponds to 18 g .
15) The chemical formula of a compound indicates the
A) relative proportions of the elements in the compound
B) identity of the elements in the compound only
C) type and arrangement of the bonds in the compound
D) three-dimensional structure of the compound
Most weak bases are:
a. Anions of weak acids
b. Anions of strong acids
C.Cations of weak acids
d. Both A and C
Answer:
The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid.
Explanation:
The stronger the acid, the weaker its conjugate base and vice versa A very weak acid has a very strong conjugate base.
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4. A photon has an energy of 2.93x10^-25 Jouls. What is the
frequency? What is the wavelength in nm?
Answer:
Hope this answer helps
Explanation:
Solve the following problems and show the complete solutions.
1. How many moles of Carbon Dioxide is equivalent to 1.5X1023 atoms of CO2?
2. If you have 5grams of pure Aluminum, (Al), how many atoms does it have? (Al=27)\.
3. If 3 moles Sodium (Na) reacts with exact Chlorine gas (Cl2) in this reaction: 2Na + Cl2 ---> 2NaCl How many mole of Sodium Chloride (NaCl) will be produced?
4. Give the mass percent composition of Potassium, Sulfur and Oxygen in a molecule of Potassium Sulfate: K2SO4.(atomic mass: K=39, S=32).
5. If 162g of Aluminum reacts with 144g of Oxygen gas to form Aluminum oxide, what is the mass percentage of Aluminum?
6. A sample was analyzed and found to contain 40% Carbon. 6.71% Hydrogen and 53.29% Oxygen. If the molecular mass of this compound is 18.16g/mol, what is the empirical and molecular formula of this compound?
The molecular formula of the compound is C6H12O6.
1) We know that;
1 mole of CO2 contains 6.02 X 10^23 atoms
x moles of CO2 contains 1.5 X 10^23 atoms
x = 1 mole X 1.5 X 10^23 atoms /6.02 X 10^23 atoms
x = 0.25 moles of CO2
2) 1 mole of pure Al has 27 g
x moles of Al has 5 g
x = 1 mole × 5 g/ 27 g
x = 0.19 moles
If 1 mole of Al contains 6.02 X 10^23 atoms
0.19 moles of Al contains 0.19 moles × 6.02 X 10^23 atoms /1 mole
= 1.14 X 10^23 atoms
3) From 2Na + Cl2 ---> 2NaCl;
2 moles of Na produces 2 moles of NaCl hence 3 moles of Na will also produce 3 moles of NaCl.
4) The molar mass of K2SO4 is obtained from;
2(39) + 32 + 4(16) = 78 + 32 + 64 = 174 g/mol
Now;
Percentage by mass of K = 2(39)/ 174 × 100/1 = 44.8%
Percentage by mass of S = 32/174 × 100/1 = 18.4%
Percentage by mass of O = 4(16)/174 × 100/1 = 36.8%
5) The reaction equation is;
4Al(s) + 3O2(g) ----> 2Al2O3
Total mass present = 162g + 144g = 306 g
Mass percent of Al = 162g/ 306 g × 100/1 =52.9%
6)
C - 40/12 H - 6.71/1 O - 53.29/16
C - 3.33 H - 6.71 O - 3.33
Dividing through by the lowest ratio
C- 3.33/3.33 H - 6.71/3.33 O - 3.33/3.33
C - 1 H - 2 O - 1
The empirical formula is CH2O
Now;
[12 + 2(1) + 16] n = 180.16
30n = 180.16
n = 180.16/30
n = 6
The molecular formula is C6H12O6.
Learn more about molecular formula: https://brainly.com/question/11588623
Definition for starch in science ?
Answer:
Starch is a polysaccharide comprising glucose monomers joined in α 1,4 linkages. orStarch is a long-chain polymer of glucose molecules joined together. orA starch is a complex polysaccharide made up of a large number of glucose units joined together by glycosidic bonds.Explanation:
starch, a white, granular, organic chemical that is produced by all green plants. Starch is a soft, white, tasteless powder that is insoluble in cold water, alcohol, or other solvents.
Starch is amongst the most abundant plant products and is a mixture of two polymers, amylose and amylopectin. During food processing starch is transformed by hydrothermal treatments. ... The structure of starch is also influenced by specific and non-specific interactions with other food constituents and ingredients.
any process that results in the formation of an ion
The energy required to cause a gaseous atom or ion to release a electron is what?
Answer:
Ionization is the process by which ions are formed by gain or loss of an electron from an atom or molecule.
Rewrite 5.13467 X 10-6 in correct standard form
a side reaction occurs when acid is added to the system. which species reacts with the acid?
A side reaction occurs when acid is added to the system, so the species reacts with the acid is base.
What are acids?Acids are those species which have a pH range in between 0 to 7, generally acids are present with hydrogen atom in their molecular formula.
If in any reaction after adding the acid, side reaction wiull occur then in this condition base will reacts with the acid as it has the opposite behavior as of acid and formation of salt & water molecules takes plavce.
Hence the needed species is base.
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How many sig figs are in 6.0395? Please no links-
Answer:
5 significant figures
Explanation:
The zeros as considered when they are in between or after numbers greater than zero.
Ex1: 0.005 = 1 significant figure
Ex2: 0.0050 = 2 significant figure
Ex3: 0.05500= 4 significant figure
Ex4: 5.00 = 1 significant figure
How do you convert particles to moles, and mass to moles?
1) 77.56 g of CaCO3 to moles
2) 2.55 x 10^24 molecules of KCl to grams
3) 0.0931 mol of BaCl2 to grams
4) 1.55 x 10^22 molecules to moles
5) 0.664 moles of HF to molecules
6) 86 g of Fe(NO3)3 to moles
7) 7.88 x 10^23 molecules of CO2 to grams
8) 2.93 moles of MgF2 to grams
9) 7.56 g of MgCO3 to moles
10) 8.55 x 10^21 molecules of NaCl to grams
1. mol = 77.56/100 = 0.7756 mol
2. mol = 2.55 × 10^24/6.02 × 10^23 = 4.236 mol mass = 4.236 × 74.5 = 315.582 g
3. mass = 0.0931 × 208.3 = 19.393 g
4. mol = 1.55 × 10^22/6.02 × 10^23 = 0.0257 mol
5. molecules = 0.664 × 6.02 × 10^23 = 3.997 × 10^23 molecules
6. mol = 86/242 = 0.355 mol
7. mol = 7.88 × 10^23/6.02 × 10^23 = 1.309 mol mass = 1.309 × 44 = 57.596 g
8. mass = 7.56 × 62 = 468.72 g
9. mol = 7.56/84 = 0.09 mol
10. mol = 8.55 × 10^21/6.02 × 10^23 = 0.014 mol mass = 0.014 × 58.5 = 0.819 g
recheck to ensure all answers are correct
Which of these is found in the energy levels of an atom?
Answer:
Electrons
Explanation:
Because the nucleas is In the middle and the Electrons surround it
Calculate the minimum volume of oxygen gas, at room temperature and pressure(r.t.p). required to completely burn 56g of methane gas. Give your answer to two significant figures. (1 mole of any gas occupies 24 dm³ at r.t.p,Ar:C=12,H=1)
BALANCED EQUATION FOR THE BURNING OF METHANE GAS.
CH₄+2O₂→CO₂+2H₂O
Answer:
170 dm³ (2 significant figures)
Explanation:
CH₄ + 2O₂ → CO₂ + 2H₂O
We need to find how much 'volume' of O₂ is required to burn 56 g of CH₄.
Let's take the ratios of the two gases only.
CH₄ : 2O₂ (in terms of moles the ratio is 1:2)
56g : x dm³
Mr of CH₄ : Volume of oxygen at rtp
Find the Mr of CH₄.
Mr of CH₄ = 12 + (1 × 4) = 16
We know that 1 mole of any gas occupies 24 dm³ at room temperature and pressure (rtp). We have to find the volume of oxygen, there are 2 moles of oxygen, so 2 moles of gas will occupy:
2 × 24 = 48 dm³
56g : x dm³
16 : 48 dm³
16x = 56 × 48
16x = 2688
x = [tex]\frac{2688}{16}[/tex]
x = 168 dm³
∴ the minimum volume of oxygen gas, at room temperature and pressure required to completely burn 56g of methane gas is 170 dm³
magnesium carbonate and sulphuric acid react to form
Answer:
magnesium sulfate + water + carbon dioxide
Explanation:
2NaOH(aq) + Cl2(g) -> NaCl(aq) + NaClO(aq) + H20(l)
Answer:
Cl2(g) + 2 NaOH(aq) = NaCl(aq) + NaClO(aq) + H2O(l)
Explanation:
So if you take an egg and cook it, is it still a baby chicken?
When the egg first forms it's only one cell, and is fertilized as it moves down the oviduct to be laid
__________________________________________________________
this point it's technically an embryo : though it doesn't look like a baby chick
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An atom which has 9 protons, 8 neutrons, and 9 electrons will have an atomic mass of how many amu?
a. 6
b. 8
C. 9
d. 17
Answer:
D
Explanation:
Protons and Neutrons both have a mass of about 1 amu so you add them but electrons have a mass of 0 amu so they are left out.
Please help with the question in the picture!
Answer:
B. 1s,2s,2p,3s
Explanation:
why do solids maintain their shape whereas fluids do not
Sodium has more valence electrons than magnesium.
True
False
Correct answers only please, no links. (15 points)
Answer:
False
Explanation:
hi! sodium has one valence electron while magnesium has 2. this is because of their position on the periodic table. sodium is the first in the row, meaning it has one valence electron. magnesium is next to sodium on the periodic table, meaning it is second in the row and has two valence electrons. hope this helps!
Explain two ways to restore the Florida Panther population.
Answer:
Explanation: encourage your legislators to support land acquisition programs such as Florida Forever and the Rural and Family Lands Protection Program.
What is changing if you're accelerating?
Answer:
Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
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Answer:
your speed
Explanation:
If you start to accelerate, you are bound to move faster
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Answer:
160.3 g S
Explanation:
How many grams of copper would you need to produce 50.0g of silver? 1 Cu + 2 AgNO3 ----> 2 Ag + 1 Cu(NO3)2
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Answer:
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Explanation:
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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.