Answer:
Thermoplastics have low melting temperature because of the week van der Waals bonds between their Long Chain Molecules
Polymer chains once synthesized they will remain stable in the environment because of the strong covalent bonds in the Long Chain Molecules
Explanation:
Thermoplastics are polymers that are easily melted and changed to another shape as many times as possible. They become molten when they are heated and solidify when cooled. Examples of thermoplastics include; polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamides, polyesters, and polyurethanes.
Polymers are organic materials that consists of a long chain of atoms held together by strong covalent bonds. Polymers constitute an important environmental concern because most polymers are non biodegradable and remain in the environment almost indefinitely.
. Give two everyday examples of the thermal energy of a substance being increased.
Answer:
• the warmth from the sun
• the heat from another a heater
• A cup of hot chocolate
•baking in an oven
Two everyday example that we say for the thermal energy of a substance being increased are, faster movement of the substances and boiling if liquids as well light absorption.
What is thermal energy?Thermal energy is a form of energy generated by heating up a substance. It can also be generated by the movement of its particles.
Vibrating molecules increases the thermal energy of a substance. Similarly, when we heat a substance it acquires more thermal energy.
Another way of increasing thermal energy is light absorption by the substance. Thermal energy associated with light increases the temperature of of the system which is absorbed the light.
Hence, the two ways by which thermal energy of a substance is increased are heating or boiling and faster movement.
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Concentration data is commonly monitored during a reaction to determine the order with respect to a reactant. Consider the types of observations listed, and determine which order is likely for that reactant. Assume all other factors are held constant.
An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially.
Choose...first order, second order, zero order
The reaction rate increases in direct proportion to the concentration of the reactant in solution.
Choose...first order, second order, zero order
The reaction rate is constant regardless of the amount of reactant in solution.
Choose...first order, second order, zero order
Answer:
An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially - first order
The reaction rate increases in direct proportion to the concentration of the reactant in solution -second order
The reaction rate is constant regardless of the amount of reactant in solution - zero order
Explanation:
The Order of Reaction refers to the power dependence of the rate on the concentration of each reactant. The order of reaction is determined experimentally and not necessarily by inspection.
Typically, in a second order reaction, the rate of reaction increases in proportion to increase in concentration.
For a first order reaction, the rate of reaction increases exponentially as the increase in concentration.
For a zero order reaction, the rate of reaction is independent of the concentration of the reactant.
how many seconds is in 1 year
Explanation:
hope it helps :)
Which of the following is NOT powered by alternating current?
A) household electrical outlets
B) power tools
C) toasters
D) batteries
Answer:
batteries
Explanation:
bc they're powered by energy
What body of water is south of Constantinople? Atlantic Ocean Indus River Black Sea Mediterranean Sea
For the equation 2 HCI + Zn ⇒ H₂ +ZnCI₂ suppose you had 2.00 g HCI and enough Zn.
a. What mass, in grams, would you have of Zn?
b. How many grams of H₂ would be produced?
Please show your work!!
Answer:
Zinc weighs 65.38 grams per mole, so we’ve got 0.994 moles of zinc (I’ll worry about sig figs at the end). HCl weighs 36.46 grams per mile, so we’ve got 1.78 moles of HCl. However, two moles of HCl react with one mole of zinc. So only 1.78/2 = 0.890 moles of Zinc are going to react.
One mole of zinc produces one mole of hydrogen, which weigh 2.02 grams per mole. So 0.890 moles * 2.02 grams/mole means 1.90 grams of hydrogen will be produced.
Since we have 2 sig figs in the weights given, the answer should have 2 sig figs, thus 1.9 grams.
This is just an example
The salt copper(II) sulfate dissolves in water according to the reaction: CuSO4(s) Cu2+(aq) + SO42-(aq) (a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data: CuSO4(s) = -771.4 kJ mol-1 Cu2+(aq) = 64.8 kJ mol-1 SO42-(aq) = -909.3 kJ mol-1 kJ (b) Calculate the temperature reached by the solution formed when 13.0 g of CuSO4 is dissolved in 0.109 L of water at 25.0 °C. Approximate the heat capacity of the solution by the heat capacity of 109 g of pure water (specific heat capacity = 4.18 J g-1 °C-1), ignoring the mass of the salt. °C (c) Heats of reaction find practical application in hot packs or cold packs. Would this dissolution reaction be appropriate for the preparation of a hot pack or a cold pack?
Answer:
(a) [tex]\Delta H=-73.1\frac{kJ}{mol}[/tex]
(b) [tex]T_2=38.1\°C[/tex]
(c) Yes, it is appropriated.
Explanation:
Hello.
(a) In this case, given the formation enthalpies for copper (II) sulfate, copper (II) ion and sulfate ion, we can compute the enthalpy change for such process as follows:
[tex]\Delta H=\Delta H_{Cu^{2+}}+\Delta H_{SO_4^{-2}}-\Delta H_{CuSO_4}\\\\\Delta H=64.8-909.3-(-771.4)\\\\\Delta H=-73.1\frac{kJ}{mol}[/tex]
(b) In this case, since 13.0 g of copper (II) sulfate (molar mass: 159.55 g/mol) we can compute the gained heat by water via:
[tex]Q_{water}=-n_{CuSO_4}\Delta H=-13.0g*\frac{1mol}{159.55g}* -73.1\frac{kJ}{mol}\\ \\Q_{water}=5.96kJ=5960J[/tex]
As the heat lost by the reaction is gained by the water, therefore, the final temperature is:
[tex]Q_{water}=m_{water}Cp_{water}(T_2-T_1)\\\\T_2=T_1+\frac{Q_{water}}{m_{water}Cp_{water}}\\ \\T_2=25.0\°C+\frac{5960J}{0.109L*\frac{1000g}{1L}*4.18\frac{J}{g\°C} } \\\\T_2=38.1\°C[/tex]
(c) In this case, since this dissolution reaction is exothermic as it increases the temperature when undergone, we can infer that yes, this dissolution would be appropriate for the preparation of a hot pack, because a cold pack would be with an endothermic dissolution reaction.
Best regards.
What is gonna be the density of a block charger that is 22g and 210 cm3
Answer:
Control group
2.6
+
3.78
How do you solve this problem
Answer:
6.38
Explanation:
line up the decimals
it helps to add another 0 to 2.6 so that you can align them better
1
2.60
+ 3.78
= 6.38
8 + 0 = 8
6 + 7 = 13; write 3 and carry the one over above the 2 in 2.60
2 + 3 + 1 = 6
I tried my best to show it through text.
Can you determine the equation for density?
Answer:
YESBSJSKSSKEKEJRJRJER
Mass is a unique property of any property.
Which of the following statements is/are correct? i. Principal energy levels are identified by the letters s, p, d, and f. ii. Principal energy levels appear in both the quantum mechanical model of the atom and the Bohr model of the atom. iii. In general, n = 1 is at lower energy than n = 2, and n = 2 is lower than n = 3, and so on. iv. The principal energy level is related to electron spin. a. i only b. iv only c. i and ii d. ii and iii e. iii and iv
Answer:
d. ii and iii
Explanation:
Both the Bohr model and the wave (quantum) mechanical models of the atom recognize the principal quantum number n. The principal quantum number shows the shell or energy level where an electron may be found.
The energy levels are arranged in increasing order of magnitude. That is n=1 >n=2=n=3 etc
Which of the following can be broken down by chemical processes but not physical processes?
elements
compounds
all of these
mixtures
Answer:
Elements and compounds
Explanation:
Elements and compounds, mixtures are not chemically bonded and can be physically seperated
The rate of reaction in terms of the "rate law expression" includes the rate constant (kk), the concentration of the reactants, and the orders of the reaction with respect to the different reactants. Consider the following reaction: A+B→C+DA+B→C+D The initial concentrations of the reactants AA and BB are 0.200 MM and 0.350 MM, respectively. The rate of reaction is 0.060 M⋅s−1M⋅s−1, and the orders of the reaction, with respect to reactants AA and BB, are 1 and 2, respectively. Determine the rate constant (kk) for the reaction using the rate law. Express your answer in M−2⋅s−1M−2⋅s−1 to three significant figures.
Answer:
[tex]k=2.45M^{-2}s^{-1}[/tex]
Explanation:
Hello.
In this case, considering the given specific orders of reaction, we can write the rate law as:
[tex]r=k[A][B]^2[/tex]
Thus, considering the concentrations of A and B to be 0.200 M and 0.350 M respectively and a rate of 0.060 M/s, the rate constant turns out:
[tex]k=\frac{r}{[A][B]^2}\\ \\k=\frac{0.060M/s}{(0.200M)(0.350M)^2} \\\\k=2.45M^{-2}s^{-1}[/tex]
This is what we know as a third-order reaction since the specific orders both add to 3.
Best regards.
What element has an atomic mass 4?
Answer:
Helium has atomic mass 4.002602.
So the answer to yr question is helium.
Which group is the most reactive?
*
Alkaline Earth Metals
Alkali metals
Noble Gases
Lanthanides
Answer:
alkali metals- Group 1
Explanation:
they have less valence electrons and therefore are more reactive
Fluorescent light bulbs, or CFLs, prevent the loss of energy from light bulbs as ________ energy.
Answer:
Compact fluorescent lamps, or CFLs, use 75 percent less energy than a traditional incandescent bulb, but they never quite caught on for home use.Feb
If 65,000 J of energy were transferred to 450 g of water at 20˚C. What would have been the final temperature of the water?
Answer:
500g
Explanation:
Answer:Suppose that during the Icy Hot lab that 65 KJ of energy were transfered to 450 g of water at 20 degrees C. What would have been the final temerpatur
Explanation:
Viktor tests a solution with a strip of blue litmus paper. The paper turns pink. The solution is a _____.
weak acid
weak base
strong acid
strong base
Answer:
The solution is acidic.
Explanation:
Calculate the mass of a sample of fruit sugar, fructose,
C6H1206, containing 2.65 X 1020 molecules.
Answer:
, containing 2.65 X 1020 molecules.
Explanation:
The mass of a sample of fruit sugar (fructose) C₆H₁₂O₆, containing 2.65 ×10²⁰ is equal to 2.88 g.
What is Avogadro's number?Avogadro’s number can be defined as the number of units in one mole of any chemical substance. Generally, these entities can be electrons, molecules, atoms, ions, or protons, depending upon the kind of chemical reaction or reactants and products.
The value of Avogadro’s constant is found approximately 6.022 × 10²³ mol⁻¹.
Given, the number of molecules of fructose = 2.65 ×10²⁰
The molar mass of the fructose = 180.16 g/mol
So 6.022 × 10²³ molecules of fructose have mass = 180.16 g
Then 2.65 × 10²⁰ fructose molecules will have mass = 2875.04 × 10⁻³ g
The mass of the 2.65 × 10²⁰ fructose molecules = 2.88 g
Therefore, the mass of 2.65 × 10²⁰ fructose molecules is equal to 2.88 g.
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g The free energy change of the reaction A (g) ---> B(g) is zero under certain conditions. The STANDARD Free energy change of the reaction is -42.5 kJ. Which of the following statements must be true about the reaction described here? A) The concentration of the product is greater than the concentration of the reactant. B) The reaction is at equilibrium. C) The concentration of the reactant is greater than the concentration of the product.
Answer:
The reaction is at equilibrium.
Explanation:
In thermodynamics, the Gibbs free energy is a term used traditionally to refer to the available or useful work that can be obtained from a thermodynamic system.
Gibbs free energy is a measure of the chemical potential that a reaction has left to do work. Hence, if the free energy is zero, then the reaction has attained equilibrium, and there is no more work to be done
The statement that should be true related to the reaction should be that it should be at equilibrium.
What is Gibbs free energy?In terms of thermodynamics, this energy should be applied for the availability or the useful work that should be obtained via the system of thermodynamics.
Also, it determined the chemical potential where the reaction has left for doing the work. Also in the case when the free energy should be zero so here the reaction should be attained the equilibrium.
hence, the option b is correct.
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Why does water vapor
condense at higher
elevations?
A. cooling causes condensation
B. faster particle activity
C. due to a chemical change
D. due to a chemical reaction
Answer:
A. cooling causes condensation
Explanation:
air is cooler at higher altitude in the troposphere.
How are gases and liquids different from each other? O A. Liquids can change volume, and gases cannot. B. Gases can change shape, and liquids cannot. C. Liquids can change shape, and gases cannot. D. Gases can change volume, and liquids cannot.
Answer:
d
Explanation:
d is the right answer since gases do not have definite shape and volume and liquids have definite volume. so liquid cannot change its volume but gas can
Is avocado a fruit or a vegetable?
(dont me with my question rn xD)
The diagram below shows a lithium atom. Which of the following correctly lists the particles in a lithium atom? *
Captionless Image
A. 3 protons, 4 neutrons, 3 electrons
B. 3 protons, 3 neutrons, 4 electrons
C. 4 protons, 4 neutrons, 3 electrons
D. 4 protons, 3 neutrons, 4 electrons
4. A method in which two or more components of different sizes are sepa-
rated from a mixture on the basis of the difference in their sizes.
Answer: Sieving
Im 100% sure its the answer!
What do metalloids and non metals have in common
Answer:
Metalloids are brittle like Non-Metals
Explanation:
How much heat is required to raise the temperature of 93.5 gg of water from its melting point to its boiling point
Answer:
39270 J
Explanation:
The quantity of heat required to raise the temperature of a substance from its initial temperature to its final temperature is given by:
Q = mCΔT
m = mass of substance, C = specific heat capacity of substance, ΔT = temperature change = final temperature - initial temperature
Melting point = 0°C, boiling point = 100°C, m = 93.5 g = 0.0935 g, ΔT = boiling point - melting point = 100 - 0 = 100°C, C = 4200 J/kg°C
Q = mCΔT
Q = 0.0935 × 4200 × 100 = 39270 J
Explain the arrangement of the first 20 elements in the periodic table.
Please help! Will give brainliest!
There are various kind of elements that are present in periodic table. Elements that are metals are kept on left side of periodic table and elements which are non metals are kept on right side of periodic table.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals and metalloids element arranges in increasing atomic number.
The first 20 elements of periodic table are Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Potassium and Calcium. Out of these Lithium, Beryllium, Sodium, Magnesium. Potassium and Calcium are metals so they are kept on the left side of the periodic table while others are non metals so they are kept on right side of periodic table.
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What is the speed of each vehicle? (Remember S=d/t)
A: 50 km/h, B: 40 km/h
A:5 km/h, B: 2 km/h
A: 10 km/h, B: 5 km/h
A: 20 km/h, B: 10 km/h
Answer : The correct option is A: 20 km/h, B: 10 km/h
Explanation :
Speed : It is defined as the distance traveled per unit time.
Formula used:
[tex]S=\frac{d}{t}[/tex]
where,
S = speed
d = distance
t = time
First we have to calculate the speed of vehicle A.
Given:
Distance of vehicle A = 50 km
Time of vehicle A = 2.5 hr
Now putting all the given values in the above formula, we get:
[tex]S=\frac{50km}{2.5hr}=20km/hr[/tex]
Now we have to calculate the speed of vehicle B.
Given:
Distance of vehicle B = 50 km
Time of vehicle B = 5 hr
Now putting all the given values in the above formula, we get:
[tex]S=\frac{50km}{5hr}=10km/hr[/tex]
Therefore, the speed of vehicle A and B is 20 km/hr and 10 km/hr respectively.