Answer:
HC2H3O2(I) + O2(g) ---> H2O(I) + CO2(g) ΔH= -72.35 kJ
Explanation:
We know that 5.0 g of acetic acid will contain, 5.0g/60 g/mol = 0.083 moles of acetic acid
Now from the reaction equation;
1 mole of acetic acid evolved -871.7 KJ of heat
0.083 moles of acetic acid will evolve 0.083 * -871.7 = -72.35 KJ
For 5.0 g of acetic acid, we can write;
HC2H3O2(I) + O2(g) ---> H2O(I) + CO2(g) ΔH= -72.35 kJ
What are the two main types of energy?In an illustration, lines of force are drawn around a magnet to illustrate the magnetic
TIMED TEST PLEASE HURRY!!! The development of a new experimental method is most likely to change a theory if it makes it possible to
analyze samples when they are frozen.
perform the experiment in a different lab.
obtain and analyze results more quickly.
study a larger sample size than before.
Answer:
study a larger sample size than before.
Explanation:
Science is evolving day by day and every new experiment is contradict the old experiment, giving new theories.
The advancement in the technology modifying the new experimental methods and it can change a theory if study a larger sample size than before. It is so because new experiment verify and validates larger sample size and evidences can contradict the old theory. Large sample size means more experiments and more validations.
Hence, the correct answer is "study a larger sample size than before."
Answer: is the D
Explanation:
Determing Valence Electrons
Use your periodic table to determine the correct number of valence electrons for the elements below
Element
Group Number
Valence
Electrons
Period
Energy Levels
+
Cesium (Cs)
lodine 0
Arsenic (As)
Gallium (Ga)
TOMMY (persistently but a little intimidated by the crowd) It's always that way, in every story I ever read about a ship landing from outer space. —The Monsters Are Due on Maple Street, Rod Serling What scientific fact is Tommy’s theory based on? Meteors can do some crazy things. Spaceships often land on Earth. Technology makes space travel possible. Meteors can move people from planet to planet.
Answer:
Technology makes space travel possible.
Explanation:
bc the guy above me is wrong I had to guess and I got it right
Answer:
Technology makes space travel possible.
Explanation:
got it right on edge
A process in which substances chemically rearrange to form new substances
Molecule
Energy
Organism
Chemical reaction
Matter
Cellular respiration
Answer:
Chemical reaction
Explanation:
After new substances are formed they can't be reversed to their original state.
help I'm giving you a lot of points and do not put random or crazy stuff the real question
You are trying to design a homemade ice pack. As you select the chemicals for this reaction, should you choose an endothermic reaction or an exothermic reaction? Why?
Answer:
Endothermic
Explanation:
Because Endothermic is cold and exothermic is hot and if you are using an ice pack it would be Endothermic and if you were using something that was hot it would be exothermic
Bill stands in a swimming pool and notices that the water around his feet is a lot cooler than the water near the surface which process causes this difference in temperature?
1. convection
2. evaporation
3. radiation
4. conduction
Submit Answer
Answer:
convection
Explanation:
How does thermal energy flow between a hot or cold pack and the atmosphere?
Answer:
Heat is the transfer of energy. During energy transfer, the energy moves from the hotter object to the colder object. This means that the hotter object will cool down and the colder object will warm up. The energy transfer will continue until both objects are at the same temperature.
Explanation:
What might the student have done that caused this
error? List all possible causes.
Answer:
The capillary tube was too close to the bottom of the beaker.
The ruler may have moved.
Water got into the capillary tube.
The temperature was not allowed to equilibrate in the 2-4 minutes.
Explanation:
Where are the electrons inside an atom?
A.The electrons are in the nucleus of an atom
B.They are arranged in energy levels
C.The electrons are spread equally throughout the atom
Answer: B.They are arranged in energy levels
Explanation: Electrons orbit around the nucleus of an atom, and are not spread around equally throughout an atom because there are a different amount of electrons that can fit in each energy level or electron shell (both are the same thing). For example the first energy level can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third can hold up to 18, and so on represented by the equation 2(n^2)
Put the following metals in order of reactivity.
Iron, potassium, copper, zinc, lead, calcium, magnesium, sodium, gold
Most reactive
Least reactive
Complete the equations
metal + oxygen → …………………….
metal + water → ……………………. + …………………….
metal + acid → ……………………. + …………………….
What is formed when magnesium burns in air?
…………………….…………………….…………………….…………………….
What happens when copper is put into a beaker of water?
…………………….…………………….…………………….…………………….
How do you test for hydrogen gas?
…………………….…………………….…………………….…………………….
What is formed when sodium reacts with hydrochloric acid?
…………………….…………………….…………………….…………………….
How should metals more reactive than carbon be extracted from their ores?
…………………….…………………….…………………….…………………….
Why is gold used in jewelry?
…………………….…………………….…………………….…………………….
What is the rule for displacement reactions?
…………………….…………………….…………………….…………………….
Tick which reactions would happen
copper
Magnesium
zinc
copper sulfate
Magnesium
sulfate
Zinc Sulfate
Using the reactions from Q10. Choose 1 reaction you’ve ticked and explain why it happens. Choose 1 reaction you haven’t ticked and explain why it doesn’t happen.
…………………….…………………….…………………….…………………….
…………………….…………………….…………………….…………………….
…………………….…………………….…………………….…………………….
…………………….…………………….…………………….…………………….
Write word and symbol equations for the first reaction from Q11.
…………………….…………………….…………………….…………………….
…………………….…………………….…………………….…………………….
Answer: copper, zinc, lead, magnesium, potassium, sodium, iron, gold.
Explanation:
what ions are formed when sodium reacts with fluorine
Answer:
One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom. In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it.
Explanation:
Since protons (p+) with a positive charge and neutrons (n0) without a charge are located in the nucleus, what is the overall charge of the nucleus portion of an atom: positive, negative, or no charge at all? Explain.
Answer:
Positive
Explanation:
The nucleus of an atom has a net positive charge which is balanced by the negative charge of the electrons residing in the orbital of an atom. The reason why the nucleus of an atom is positively charged is because it contains two sub atomic particles;
The protons and neutrons. In terms of charge, the proton is positively charged and the neutron is neutral. This means the neutron does not partake in the charge of the nucleus. Hence the net charge of the nucleus is decided by the protons which are positively charged
Calculate the mass of 4.55x1024 molecules of sucrose
Answer:
2584 g
Explanation:
The molecular formula for sucrose is C₁₂H₂₂O₁₁, which means its molar mass is 342.3 g/mol.
First we convert molecules into moles by using Avogadro's number:
4.55x10²⁴ molecules ÷ 6.023x10²³ mol/molecules = 7.55 molNow we convert moles of sucrose into grams, using its molar mass:
7.55 mol * 342.3 g/mol = 2584 gCan someone pls help me on this
Answer:The bottom 3
Explanation:
Beacuse all of these have to do with this subject hope this helps.
If you used .010 moles of baking soda, what mass of carbon dioxide should be produced?
Answer:
d
Explanation:
5. Solve the following crossword puzzle.
a. Maximum energy generation in India is done using ........ energy.
b. energy is a renewablesource of
energy.
c.Solar energy can be called.... energy.
e. ......... energy of water in dams is used for generation of electricity.
Answer:
I think it is b
Explanation:
5. A fireplace fire heating a room on a cold day is an example of what type of heat
transfer? What are the steps of heat transfer?
A. Conduction, fireplace>room
B. Conduction, room>fireplace
C. Radiation, fireplace>room
D. Radiation, room>fireplace
Answer:
I think the answer is C- radiation
Explanation:
If its not C its A Hope this helps forgive me if i'm wrong :/
Answer: C
Explanation: The fire in the fireplace is giving off heat because it doesn't need a medium to travel through.
HELLPP!!! What is needed in order to write the electron configuration for elements? Choose all that applies.
Answer:
atomic number and electrons
Explanation:
Was Dalton's Atomic Theory correct or incorrect and why?
Answer:
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions. ... According to Dalton, atoms of different elements combine in simple whole number ratios to form compounds.
1
1. Inphotosynthesis, plants convert Inwhat type of energy into what other type of energy?
Pls help me
can someone help answer this? thanks!
if surface tension relies on intermolecular forces, how could you make surface tension decrease?
(think about how and where molecules bind to each other)
Answer:
We could make the surface tension to decrease by removing and causing a disruption to the intermolecular forces(hydrogen bonds).
Explanation:
To explain this answer, we will consider an experiment whereby a paper clip is made to rest at the top surface of water inside a container/beaker.
First of all, the intermolecular forces present in water are also known as hydrogen bonds.
It's relationship with surface tension is that when there is high surface tension in the water, this high tension will allow the paper clip to rest on top of the hydrogen bonds present at the top surface in between the water molecules.
However, the surface tension will decrease when we remove or cause a disruption to the intermolecular forces (hydrogen bonds).
The standard unit for measuring mass is the
Answer:
kilogram (kg)
Explanation:
what is a similar math problem to the calcium and water equation
Answer: Calcium is a metal and a typical reaction of a metal with water will be as follows: ... the chemical reaction for calcium and water will be: [Word Equation] Calcium + 48.
Explanation: Please Please mark me as brainliest!
PLEASE HELP!! WILL MARK BRAINLIEST
Use the Internet to list five examples of elements with their properties and five examples of compounds with their properties.
Answer:
here you go
Explanation:
5 elements and properties:
Boron- The chemical properties of boron are more similar to carbon and silicon than elements of its own group, although boron is more electron deficient. Boron has a high affinity for oxygen-forming borates, and reacts with water at temperatures above 100 °C to form boric acid and other boron compounds.
Carbon- As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. The most common isotope of carbon has 6 protons and 6 neutrons, and has an atomic mass of 12.0107 amu. Its ground state electron configuration is 1s22s22p2.
Nitrogen- Nitrogen gas (chemical symbol N) is generally inert, nonmetallic, colorless, odorless and tasteless. Its atomic number is 7, and it has an atomic weight of 14.0067. Nitrogen has a density of 1.251 grams/liter at 0 C and a specific gravity of 0.96737, making it slightly lighter than air.
Oxygen- is the air you breath
Nickel- Nickel is a hard silver white metal, which forms cubic crystals. It is malleable, ductile, and has superior strength and corrosion resistance. The metal is a fair conductor of heat and electricity and exhibits magnetic properties below 345°C
5 compounds and properties:
Water - Formula: H2O = Hydrogen2 + Oxygen. ...
Hydrogen Peroxide - Formula: H2O2 = Hydrogen2 + Oxygen2 ...
Salt - Formula: NaCl = Sodium + Chlorine. ...
Baking Soda - Formula: NaHCO3 = Sodium + Hydrogen + Carbon + Oxygen3
Octane - Formula: C8H18 = Carbon8 + Hydrogen18
hope this helps
Molecules are
close and
barely move
They keep
one shape
What is genetic variation?
______and __________ factors can affect an organism’s genetic traits
Answer:
i think its Environmental and mutagens
Explanation:
Which elements had only one valence electron?
Answer:
sodium has only one valance electron in valence shell
Which statement correctly compares electric charge with electric current?
A.
They both require a human to make them.
B. Neither require charged particles.
C. They both require a battery and a bulb
D. They both require a movement of charged particles.
Answer:
Your answer would be D) They both require a movement of charged particles
Explanation:
In short terms both the charge and the current are made up of charged particles that are always moving, they constantly move to well... stay charged, if they stopped, then the charge would fade until there is nothing left, and if there is nothing left -it means there would be no electricity to use
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