Polyethene is a polymer composed of repeating units of the monomer ethene.
The properties of polyethene are as follows:
density- ranges 0.857 g/cm3 to 0.975 g/cm3.specific heat capacity is 1.9 kJ/kg.melting temperature is approximately 110 °C.What are polymers?Polymers are large macromolecules consisting of long repeating chains of smaller molecules known as monomers.
An example of a polymer is polyethene composed of repeating units of the monomer ethene.
The density of polyethylene ranges 0.857 g/cm3 to 0.975 g/cm3.
The specific heat capacity of polyethene is 1.9 kJ/kg.
The melting temperature of polyethene is approximately 110 °C.
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A block has dimensions 1.0 dm, 4.2 cm, and 25 mm, with a mass of 5.326 kg. Calculate the density of this block in g/cm 3 .
Answer:
1 dm equals about 10 cm
25 mm equals 2.5 cm
and then we have 4.2 cm, including a mass of 5.326 kg
How do we find the density of the block?
First, lets rewrite our formula.
d = mass divided by volume.
lets multiply 10 cm x 2.5 cm x 4.2 cm
this equals 105.
Now, lets turn 5.326 kg into what we need to divide.
1000 cm x 5.326 kg is 5326 cm
now lets do 5326 into 105
thats 50.
Explanation:
50 is the answer.
If you had excess chlorine, how many moles of aluminum chloride could be produced from 28.0 g of aluminum?
Answer:
1.04 moles of AlCl₃
Explanation:
Balanced Equation: 2Al°(s) + 3Cl₂(g) => 2AlCl₃(s)
Approach => convert given data (28 g Al°) to moles. The number of moles AlCl₃ would equal the number of moles aluminum because coefficients for Aluminum and Aluminum Chloride are equal.
moles Al° = (28g)/(27g/mole ) = 1.04 mole Al°
From balanced equation moles AlCl₃ produced equals moles of Al° produced = 1.04 mole AlCl₃ because coefficients of Al° & AlCl₃.
Single-celled organisms that do not contain their genetic material in a
nucleus are called
Answer:
A prokaryotic cell is a simple, single-celled (unicellular) organism that lacks a nucleus, or any other membrane-bound organelle. We will shortly come to see that this is significantly different in eukaryotes. Prokaryotic DNA is found in the central part of the cell: a darkened region called the nucleoid.
Explanation:
HiH
Answer:Prokaryotes
Explanation:Prokaryotes are organisms whose cells lack a nucleus and other organelles. Prokaryotes are divided into two distinct groups: the bacteria and the archaea, which scientists believe have unique evolutionary lineages. Most prokaryotes are small, single-celled organisms that have a relatively simple structure.
As the pH of ocean water decreases, it becomes more _____.
Question 2 options:
acidic
basic
Answer:
Acidic
Explanation:
The average pH of the ocean is now around 8.1, which is basic (or alkaline), but as the ocean absorbs more CO2, the pH drops and the ocean becomes more acidic.
A chemist uses atomic absorption spectroscopy to measure the amount of calcium in a urine sample. When preparing the sample for analysis, the chemist adds an excess of La3 to the sample. Why is La3 added to the urine sample
Answer: La+3 binds to PO4-3 in the urine sample which prevents the formation of Ca3(PO4)2 and frees the Ca+2 in the sample to be atomized.
Explanation:
In the presence of phosphates, the calcium ions form a refractory compound (calcium phosphate) which is not atomized in the plasma/flame in atomic absorption spectroscopy.
The addition of a releasing agent like lanthanum to the sample minimizes the formation of refractory compounds as the lanthanum binds with the phosphate ions to form more volatile compounds.
Oxides are:
A. Products formed during combustion
B. Products formed during double replacements
C. Reactants in combustion
D. Only formed during complete combustion
Answer:
only formed during complete combustion
Explanation:
ex:c+o2=co2 then it is a oxide
so what does b2∛ ÷ n5≅ equal
Answer:
Simplify:
3
√
8
y
3
.
Solution: Use the fact that
n
√
a
n
=
a
when n is odd.
Answer:
2
y
Explanation:
Which type of precipitation is most likely to form during a thunderstorm A sleet
B hail
C snow
D freezing rain
Hail is most commonly formed within the cumulonimbus clouds of thunderstorms. Large updrafts of air can throw rain droplets high up into the tops of the cloud.
What is a thunderstorm?
A thunderstorm is a type of weather phenomenon characterized by thunder, lightning, and often heavy rain or hail. Thunderstorms are caused by the rapid upward movement of warm, moist air, which condenses into clouds and releases heat energy. This process can create strong updrafts and downdrafts within the cloud, which can lead to the formation of lightning and thunder.Thunder is caused by the rapid expansion of air around a lightning bolt, which creates a shock wave that we hear as thunder. Lightning is caused by the discharge of electrical energy between clouds or between a cloud and the ground. Lightning strikes can be very dangerous, and it is important to take precautions during a thunderstorm, such as staying indoors and avoiding contact with electrical appliances or metal objects.To know more about thunderstorm, click the link given below:
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Answer:
It is B.---HailExplanation:
Hope this helps good day
the dimensions of a box are 4.5 cm wide by 5.750 cm long by 1.50 cm tall.
Answer:
38.8125
Explanation:
4.5 x 5.750 x 1.50 = 38.8125
(2.6 x 10^6) / (2.0 x 10^8)
Answer:
0.013
Explanation:
Explain the difference between a working theory and a paradigm? PLEASE ANSWER QUICK I WILL MARK BRAINLIEST
Answer: The theory explains the phenomenon based on certain criteria while the paradigm provides the background or the frame that allows a theory to be tested and measured.
Explanation:
How many molecules are in 56.2 L
of CO2 at STP?
Answer:
0.25 moles (See below for explanation)
At what number carbon does the phosphate group connect to the sugar?.
Answer:
5' carbon
Explanation:
Attaching a phosphate group
A phosphate group is attached to the sugar molecule in place of the -OH group on the 5' carbon.
Answer:
The phosphate group on one nucleotide links to the 3' carbon atom on the sugar of another one. In the process, a molecule of water is lost - another condensation reaction.
What is the temperature shown on the thermometer below?
A. 8 °F
B. 4 °F
C. –4 °F
D. –8 °F
Why is this important in chemistry to balance equations?
Answer:
The bonds between atoms in the reactants are rearranged to form new compounds in chemical reactions, but none of the atoms disappear and no new ones are formed. As a consequence, chemical equations must be balanced, meaning that the number and kinds of atoms must be the same on both sides of the reaction arrow.
Answer:
The Law of Conservation of Mass states that mass is neither created nor destroyed, it only changes.
So when you balance a chemical equation, what you get is the same equation, but with the same number of atoms of each chemical element in the reactants and in the products. In this way the conservation of mass is achieved, because the same number of atoms that exists in the reactants is the one that is later transformed and appears in the products.
A balanced equation is the following:
H2 + 1/2O2 --------> H2O
Reactants: Products:
Amount of H = 2 Amount of H = 2
Amount of O = 1 Amount of O = 1
It is a balanced equation because each element has the same number of atoms in the reactants and in the products.
Explanation:
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Determine the number of KNO3 molecules in 0.750mol KNO3
The number of KNO3 molecules in 0.750 mol of KNO3 would be 4.52 x [tex]10^{23}[/tex] molecules
Number of moleculesThe number of molecules of a substance is defined by Avogadro's constant, such that:
1 mole = 6.022 x [tex]10^{23}[/tex] molecules
In this case, the number of mole is 0.750
Thus, the number of molecules in 0.750 moles of KNO3 can be calculated as:
0.750 x 6.022 x [tex]10^{23}[/tex] = 4.52 x [tex]10^{23}[/tex] molecules
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Calculate the volume occupied by 1.68 g of He gas at STP.
Answer:
Explanation:
It can be written as: V = nRT/P. "P" is pressure, "V" is volume, n is the number of moles of a gas, "R" is the molar gas constant and "T" is temperature. Record the molar gas constant "R". R = 8.314472 J/mole x K.
HURRY HELP PLEASE!!
Heather mixes two white liquids together. Immediately, a gray liquid forms.
How is the gray liquid related to the white liquids?
ОА
There is no relationship between the gray liquid and white liquids.
B
The gray liquid was released from inside the atoms of the white liquids.
С
The gray liquid is made up of the same kinds of atoms as the white liquids, but the atoms are arranged differently.
D
The gray liquid is made up of the same kinds of molecules as the white liquids, but the molecules are a different color.
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Answer:
A is the correct answer
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Type the correct answer in the box. Round your answer to the nearest whole number.
Dylan has two cubes of iron. The larger cube has twice the mass of the smaller cube. He measures the smaller cube. Its mass is 20 grams, and its
density is 7.87 g/cm? What's the larger cube's volume?
The larger cube's volume is about cm?
Reset
Next
Answer:
Rounding volume to nearest whole number is 5cm³.
Explanation:
Given data:
Mass of smaller iron cube = 20 g
Density of cube = 7.87 g/cm³
Volume of larger cube = ?
Solution:
The mass of larger iron is twice of smaller iron cube.
It will be 40 g.
Now we will apply the density formula.
d = m/v
7.87 g/cm³ = 40 g/ v
v = 40 g/ 7.87 g/cm³
v = 5.08 cm³
Rounding answer to nearest whole number is 5cm³.
6. What are the correct coefficients in order for the equation to be balanced?
Explanation:
8O² + 1S⁸ ----> 8SO²
this is the true coefficient...
42. Water is a neutral solution, what is the pH of water?
O pH = 7
pH = 6
pH = 2
pH = 10
How many moles are in 7.0g of NaF?
there are .1667 (.17) mols in 7 grams of Sodium Fluoride (NaF)
hope this helps :)
what is electronegativity and how can it be used in determining the polarity of nonpolar
Answer:
See explanation
Explanation:
Electro negativity refers to the ability of an atom in a molecule to attract the shared electrons of a bond towards itself.
Electro negativity is a property of elements. It increases across the period and decreases down the group in the periodic table.
When two elements with differing electronegativities form a bond, the atom that has a greater electro negativity tends to pull the shared electrons of the bond towards itself. By so doing, there is greater electron density around that atom compared to the other atom. The more electronegative atom therefore acquires a partial negative charge while the other atom acquires a partial positive charge. This leads to a dipole in the molecule.
A molecule is said to be polar when it possess a dipole, that is, a positive end and a negative end. This phenomenon in turn arises when there is a significant difference in electro negativity between two atoms that compose the bond.
For instance, consider the formation of HF. Hydrogen has an electro negativity of 2.2 while fluorine has an electro negativity of 3.98. The difference in electro negativity between the both atoms is about 1.78. The molecule is polar with the negative end of the dipole at fluorine and the positive end at hydrogen.
All of the rocks in the world used to be _________________ rock called molten rock.
A balloon with volume 650 mL contains 0.10 mol of gas. If an additional 0.05 mol of gas are added to the ballon, what will be the new volume
Answer:
The volume of the balloon increases as you add moles of gas to the balloon by blowing it up. If the container holding the gas is rigid rather than flexible, pressure can be substituted for volume in Avogadro's Law. Adding gas to a rigid container makes the pressure increase
Challenge: Make another comparison.
Earth's outer layer is like because...
Answer:
Imagine that the planet is an onion. When you open it, you will discover that it can be separated into layers that are perfectly independent from each other, but that they make sense if they are united. The central part of the onion is different, almost circular.
Explanation:
The center of the planet is known as the nucleus. This layer is shaped like a sphere, and in turn is made up of two layers: the inner core (where the temperature reaches up to 5000 degrees Celsius) and the outer core (whose consistency is semi-liquid). The core is made up of nickel, iron, sulfur, oxygen, and copper.
Which relationship is present in a solution that has a pH of 7
Answer:
neutral
Explanation:
pH is usually (but not always) between 0 and 14. Knowing the dependence of pH on [H +], we can summarize as follows: If pH < 7, then the solution is acidic. If pH = 7, then the solution is neutral
Why is it so many numbers
Answer:
Bro what numbers? And whats the question?
K2S and NaOH are soluble in water or not? Explain.
Answer:
K2S and NaOH are soluble
Explanation:
Because thay have ions formed from elements
5. 2.83 g of a sample of haematite iron ore [iron (II)oxide, Fe2O3] were dissolved in c oncentrated hydrochloric acid and the solution diluted to 250 cm3. 25.0 cm3 of this so lution was reduced with tin(II) chloride (which is oxidised to Sn4+ in the process) to for m a solution of iron(II) ions. This solution of iron(II) ions required 26.4 cm3 of a 0.020 0 mol/dm3 potassium dichromate(VI) solution for complete oxidation back to iron(III) ions. (a) given the half-cell reactions (i) Sn4+ (aq) +2e==> Sn2+ (aq) and (ii) Cr2O72- (aq) + 14H H(aq) + 6e- ==> 2Cr3+(aq) +7H206) deduce the fully balanced redox equations for the reactions (i) the reduction of iron(III) ions by tin(II) ions (ii) the oxidation of iron(II) ions by the dichromate(VI) ion (b) Calculate the percentage of iron (II) oxide in the ore.
From the solution of hydrochloric acid that is in the reaction with pottassium dichromate, the fully balanced equation for the reaction is K₂Cr₂O₇+6FeCl + 14HCI→ 2KCl +6FeCl₃ + 2CrCl₃+7H₂0
What is oxidation?This is the chemical reaction that takes place due to the fact that oxygen has been added to a substance.
a. Fe2O3+ 6HCl→2FeCl₂ + 3H₂O
Fe³⁺+e→Fe2+
2FeCl₃+SnCl₂ → 2FeCl₂ + SnCl₄
Fe²⁺ - e→Fe³⁺
K₂Cr₂O₇+6FeCl + 14HCI→ 2KCl +6FeCl₃ + 2CrCl₃+7H₂0
b. 0.02 mol/dm³ = 2x10⁻⁵ mol/ml
26.4 cm³ is the same as 26.4 ml
n(K₂Cr₂0₇) = 26.4 x2x10⁻⁵
This gives 52.8x10⁻⁵
n(FeCls) = 6n(K₂Cr₂0₇) = 3.168 x 10⁻³
n(FeCl₂)= n(FeCl₃) = 3.168x10⁻³
2 x 56 + 3x16 = 160 gram/mol
3.168x10⁻³/2 = 1.584x10⁻³
1.584x10⁻³ x 160 = 0.253
0.253 x 100/2.83 = 8.96 percent
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