Is fireworks exploding a chemical change?
Answer:
Yes
Explanation:
The fireworks explode
Answer:
The explosion of fireworks is an example of chemical change. During a chemical change, substances are changed into different substances. In other words, the composition of the substance changes.
explain the formation and breakdown of polymers?
Answer: Polymers are broken down into monomers via hydrolysis reactions, in which a bond is broken, or lysed, by addition of a water molecule. ... This is the reverse of a dehydration synthesis reaction, and it releases a monomer that can be used in building a new polymer.
Which of the following are products of the light-dependent reactions of photosynthesis that are utilized in the light-independent reactions?
ATP and NADPH
water and oxygen
oxygen and glucose
carbon dioxide and glucose
Answer:
[tex]\boxed {\tt Oxygen \ and \ glucose}[/tex]
Explanation:
The photosynthesis equation is:
energy+6CO₂+6H₂O--> C₆H₁₂O₆+6O₂
The reactants are light energy, carbon dioxide, and water. The products are glucose and oxygen.
The products of photosynthesis become the products of the light-independent reaction called cellular respiration, which creates useable energy. Therefore, the correct answer is oxygen and glucose.
A reaction of chlorine gas with sodium solid creates 45.6 grams of sodium chloride. The mass of sodium and chlorine gas price for the reaction was ___ grams
Answer:
17.94 annd 27.69 respectively.
Explanation:
Na(s) + Cl(g) n` NaCl(s)
mass of NaCl = 45.6 g
Mr of NaCl = 23 + 35.5
= 58.5g/mol
mole of NaCl = mass/Mr
= 45.6/58.5
= 0.78 moles
From the equation;
1 mole of NaCl = 1 mole of Na = 1 mole of Cl
hence 0.78 mol of NaCl = 0.78 mol of Na = 0.78 mol of Cl.
mass of Na = 0.78 × 23
= 17.94 grams
mass of Cl = 0.78 × 35.5
= 27.69 grams
The mass of the sodium and chlorine gas taken for the reaction was 17.92 grams and 27.73 grams respectively.
What is sodium chloride?Sodium chloride is an ionic compound in which the sodium (Na⁺) and chloride (Cl⁻) ions are present in a ratio of 1 : 1. It is commonly known as table salt or halite.
Sodium and chlorine react with each other to generate a substance that is familiar to everybody around the globe which is sodium chloride.
2Na (s) + Cl₂ (g) [tex]\longrightarrow[/tex] 2NaCl (s)
The atomic mass of the sodium (Na) = 23 g/mol
The atomic mass of chlorine,(Cl) = 35.5 g/mol
The molar mass of the sodium chloride (NaCl) = 58.5 g/mol
Given, the mass of the NaCl formed = 45.6 g
If 117 g NaCl formed from sodium = 2× 23 g
Then 45.6 NaCl will be formed from Na = 17.92 g
If 117 g NaCl formed from chlorine = 2× 35.5 g
45.6 NaCl will be formed from chlorine = 2× 35.5 ×45.7/117 = 27.73 g
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I need help with the question they are asking
Answer:
i wish i could help but people are around me
Explanation:
Complete orbital diagrams (boxes with arrows in them) to represent the electron configuration of valence electrons of carbon before and after sp hybridization.
Answer:
Explanation:
Before Hybridization => C: 1s² ⇵ 2s²⇵ 2p₋₁↑ 2p₀↑ 2p₊₁∅
After Hybridization => C: 1s² 2sp¹ 2sp¹ 2p₀¹2p₊₁¹ => 2 hybrid orbitals and 2 unhybridized p-orbitals at the n=2 energy level.
10. Bands of rock on the seafloor showing alternating magnetic orientation indicate Earth's magnetic field has ____.
a. reversed itself in the past
b. weakened
c. becomes stronger
d. remained the same
Answer:
The answer is Reverse Itself In The Past
Am I really stupid for not knowing this ;-;
Answer:
A. Gases;nonreactive
Explanation:
No ur not stupid, lol hope this helps!
Answer:
other dude is right also you aren't another thing sorry I be late
Explanation:
HURRY
Show step-by-step
2A + 5B --> 3C + D
2.0 mol A and 4.0 mol B react to form 1.8 mol C. What is the PERCENT YIELD of this reaction?
Answer:
Percent yield of reaction is 75%.
Explanation:
Given data:
Moles of A = 2.0 mol
Moles of B = 4.0 mol
Moles of C formed = 1.8 mol
Percent yield of reaction = ?
Solution:
Chemical equation:
2A + 5B → 3C + D
We will compare the moles of A and B with C from balance chemical equation.
A : C
2 : 3
B : C
5 : 3
4 : 3/5×4 = 2.4 mol
Number of moles of C formed by 4 moles B are less thus B is limiting reactant and will limit the yield of C.
Percent yield:
Percent yield = actual yield /theoretical yield × 100
Percent yield = 1.8 mol / 2.4 × 100
Percent yield =75%
By what means (or force) can the atoms in compounds be separated?
Answer:
chemical means
Explanation:
Compounds can be separated by chemical means physical means boiling pressure
АМА
H
+
O
HGS
-O-H
H
N-H
H
Single Bond
AMA
H
+
0
-0-H
H
Single Bond
Evidence in the fossil record points to major asteroid impacts that have caused mass extinctions in which 50%–96% of life on Earth died out.
Answer:
5
Explanation:
What is the final temperature of a 5.0g sample of water at 25C If 832 joules of heat are added?
Answer:
64.71C
Explanation:
Given
Mass (m) = 5g
Initial Temperature (T1) = 25C
Heat (Q) = 832 joules
Required
Determine the final temperature
This question will be solved using:
Q = mc∆T
Where c = specific heat = 4.19
Substitute values in the above formula, we have:
832 = 5 * 4.19 * (T2 - 25)
832 = 20.95 * (T2 - 25)
Divide both sides by 20.95
39.71 = T2 - 25
Add 25 to both sides
39.71 + 25 = T2
T2 = 64.71C
what is the formula for lead (ll) sulfate
Answer: PbSO4
Explanation: Search on google
Answer:
PbSO4
Explanation:
Which phrase describes a situation in which all the forces are balanced?
O A. A student slipping on icy ground
O B. A student leaning against a brick wall
O C. A student walking across a room
D. A student diving into a swimming pool
Answer:
B
Explanation:
I sacrificed my grade for pakistan.
Observations made during an experiment are called:
A. Data
B. Problems
C. Conclusions
D Questions
I think A
Answer:
Data
Explanation:
You are right
What is meant by H, and 2H?
Explanation:
H is 1 mole of hydrogen
2H is 2 moles of hydrogen
1. Which macromolecules would you need if... you need a quick boost of
energy?
Answer:
[tex]\boxed {\tt Carbohydrate \ or \ monosaccharides}[/tex]
Explanation:
There are 4 main types of macromolecules: lipids, proteins, carbohydrates, and nucleic acids.
If you are looking for some quick energy, the best choice is carbohydrates. Carbohydrates are the easiest for the body to break down and turn into ATP/energy.
There are also different types of carbohydrates. If you want a more specific answer, monosaccharides is the best answer. They are the simplest sugars. Also, glucose is a monosaccharide, and it shows up directly in the cellular respiration formula. If glucose is consumed, the body doesn't have to break it down before starting respiration.
How would you convert 500cc of 2M H2SO4 into g/l?
Answer:
Number of replacable H
+
ions in H
2
SO
4
=n=2
Normality =n× Molarity=2×2=4 N
Which of the following chemical equations depicts a balanced ionic equation?
Answer:
Option C. 2OH¯ + Ca²⁺ —> Ca(OH)2
Explanation:
OH¯ + Ca²⁺ —> Ca(OH)2
The above equation can be balance as follow:
OH¯ + Ca²⁺ —> Ca(OH)2
There are 2 atoms of OH on the right side and 1 atom on the left side. It can be balance by putting 2 in front of OH¯ as shown below:
2OH¯ + Ca²⁺ —> Ca(OH)2
Next, we shall balanced the charge on both side. This can be obtained as follow:
Total charge on the left side = –2 + 2
Total charge on the left side = 0
Total charge on the right side = 0
Thus, the charge on both side are equal. Hence, the balance ionic equation is:
2OH¯ + Ca²⁺ —> Ca(OH)2
What is the density of a piece of cement has a mass of 8.76 g and volume of 3.07 cm^3?
Answer:
2.85g/cm^3
Explanation:
density = mass/volume
density=8.76g/3.07cm^3= 2.85g/cm^3
Answer:
The answer is 2.85 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{8.76}{3.07} \\ = 2.85342019...[/tex]
We have the final answer as
2.85 g/cm³Hope this helps you
Can you count how many atoms there are in the following compounds?
you are given the mass of an element, you use the periodic table to find its molar mass, and multiply the given mass by the reciprocal of the molar mass. This is Mass → Moles . Once you have moles, multiply by Avogadro's number to calculate the number of atoms. This is Moles → Atoms
Which of these is an example of an ecosystem service?
A. A mangrove forest protects a coastal village from erosion.
B. A farmer uses non-chemical means to control pests and weeds.
C. A city enacts a law to protect a local lake from runoff pollution.
D. After closing a mine, a company adds soil and plants native grasses in the area.
someone help me asap.
Answer:
A
Explanation:
All of the other options involve cities, farmers, or companies. Those aren't natural occurrences, so A is the answer. The mangroves protect the village without anything being modified about that environment.
If 8.500 g of sodium nitrate and 7.500 g of potassium chloride are dissolved in 25.0 mL of water and heated to 80°C no solid Watermain. Using these amounts of potassium chloride and sodium nitrate, calculate the theoretical number of grams of sodium chloride and potassium nitrate that could be formed.
Answer:
Zero grams of NaCl & KNO₃ ... The reagents mixed in aqueous solution would not produce products as no driving force is present; i.e., no precipitate, weak electrolyte or gas decomposition product will form.
Explanation:
NaNO₃(aq) + KCl(aq) => (theoritically) NaCl(aq) + KNO₃(aq)
However all chloride salts from metathesis rxns remain soluble and 100% ionized except for halide derivatives of Hg⁺², Ag⁺ & Pb⁺₂. Further, all NO₃⁻ salt derivatives also remain soluble and 100% ionized.
Technically, metathesis reactions (also known as double replacement rxns) depend upon the formation of a 'driving force' that leaves the reaction system in the form of a precipitate, weak electrolyte (weak acid or weak base) or a gas decomposition product. So, the reaction in this case should be as follows:
NaNO₃(aq) + KCl(aq) => No Reaction
The molecular formula of butane is C4H10C4H10. It is obtained from petroleum and is used commonly in LPG (Liquefied Petroleum Gas) cylinders (a common source of cooking gas). It has two arrangements of carbon atoms: a straight chain and a branched chain.
Required:
a. Using this information, draw the structure of the tertiary butyl radical that will form upon removal of a hydrogen atom.
b. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars.
Answer:
Explanation:
Butane is an alkane with the molecular formula C₄H₁₀.
(a) It has two structural isomers (n-butane and 2-methylpropane) shown below
H H H H
| | | |
H - C - C - C - C - H
| | | |
H H H H
The structure above is n-butane
H CH₃ H
| | |
H - C - C - C - H
| | |
H H H
The structure above is 2-methylpropane and can also be referred to be a tertiary butane because the central carbon atom has 3 methyl groups attached to it as shown below.
CH₃
|
H₃C - C - CH₃
|
H
Hence, the structure of a tertiary butyl radical after loss/removal of a hydrogen atom will be
CH₃
|
H₃C - C⁻ - CH₃
NOTE: It should be noted that the central carbon becomes negatively charged after the loss of the hydrogen atom
(b) This is the practical part of the structure drawn above. The last structure illustrated above can be drawn on the canvas with the instruction provided in the question.
50 points will give brainlyest Since thermal energy represents the total energy of the particles in an object, at the same temperature, the larger object will possess more thermal energy.
Question 3 options:
True
False
Answer:
the answer to your question is: true
Thermal energy has been the total amount of energy that has been present in the object. The thermal energy has been directly proportional to the size of the object. Thus, the statement is true, and option a is correct
What is thermal energy?Thermal energy is defined as the energy possessed by the particles of the molecules and atoms that follows the kinetic molecule theory and moves faster and collides with each other when the temperature of the system has been increased.
This type of energy has been known to be passed by the object having to be in the vicinity of the temperature. Thermal energy can flow from one substance to another due to differences in temperature.
Thermal energy has been possessed by fossil fuels like coals, and natural gases, along with electric heat,m solar heat, and geothermal heat. The thermal energy has been directly proportional to the surface area and bigger objects having more surface will be able to hold more energy.
Therefore, the statement about thermal energy and surface area is true.
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Describe the flow of energy through an ecosystem from the Sun to the plant and ultimately through an animal.
Answer:
Hope this Helps! :)
Explanation:
The word ecosystem refers to the all of the living species as well as non-living elements in a particular environmental area. For instance, a lake, swamp, coral reef, forest, or a prairie would each be considered an ecosystem. Ecosystems can vary greatly in size and individual characteristics -- for instance, the ecosystem of a puddle differs greatly from that of a swath of tundra.
Despite these disparities, all ecosystems function similarly in the way in which energy flows into, through, and out of them through the energy cycle
Energy is transferred into and out of ecosystems via a web of complex interactions. Energy enters an ecosystem from external sources and moves throughout its components. For instance, energy from the sun flows through plants, microorganisms, and animals. Energy cycles in an ecosystem end with decomposition, and then the process begins anew
Essentially, the flow of energy through ecosystems can be explained by who eats what. Keep in mind, however, that energy transfer isn’t perfectly efficient; much of it dissipates as heat at various phases in the cycle.
The energy flows from the sun to the plants by photosynthesis and animal eats plants and energy is transferred from plants to animals.
What is the transfer of energy?The energy transfer isn't entirely efficient because a significant amount of it evaporates as heat at different points throughout the cycle.
Despite these differences of energy, all ecosystems function similarly in terms of the energy cycle, which governs how energy enters, passes through, and exits them.
Ecosystems receive and expend energy through a network of intricate interconnections. An ecosystem receives energy from outside sources, which circulates among its parts.
Thus, as a result of photosynthesis, energy is transmitted from the sun to plants, which are then consumed by animals.
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Carbon burns with oxygen to produce carbon dioxide gas. Which of these shows the correct chemical reaction? C + O2 → CO2 C, O, CO2 C + O = CO2 CO2 = C + O
Answer:
c+o2=co2
Explanation:
balanced reaction it is correct
Answer:
C + O2 → CO2
Explanation:
i took the test and got it right
Show the formation of Calcium chloride by the transfer of electrons
Answer:
CaCl,2
the 2 goes to the bottom right side
A ball of mass 0.2 kg is dropped from a height of 10 m. How much mechanical energy does it have right before it hits the ground? (Assume there is no air resistance.) Acceleration due to gravity is g = 9.8 m/s2.
Group of answer choices
0 J
10.0 J
19.6 J
25.4 J
Answer:
19.6 J
Explanation:
According to the formula:
M.E.= mgh