Answer:
Chemical Energy
Explanation:
Energy, Molecules and Chemical Reactions. Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy.
Where are the reproductive organs contained?
Answer:
In my sense your answer must be Pelvic cavity.
1. Describe what the following terms mean
Temperature -
Heat -
Exothermic -
Endothermic -
Write a summary on how to use a light microscope
DUE TODAY PLEASE HELP.
Answer:
Step 1: Connect the light microscope to a power source. If your microscope uses a mirror instead of an illuminator, you can skip this step. Instead, find a place where natural light is easily accessible
Step 2: Turn the revolving nosepiece so the lowest objective lens is in position.
Step 3: Mount your specimen onto the stage. But before doing so, see to it that your specimen is adequately protected by placing a coverslip on top of it.
Step 4: Use the metal clips to keep your slide in place. Make sure the specimen is positioned in the center, right under the lowest objective lens.
Step 5: Look into the eyepiece and slowly rotate the coarse adjustment knob to bring your specimen to focus. See to it that the slide does not touch the lens.
Step 6: Adjust the condenser for the maximum amount of light. Since you're on the low power objective, you may have to decrease the illumination. Use the diaphragm under the stage to adjust.
Step 7: Now slowly rotate the fine adjustment knob until you obtain a clearer image of your specimen.
Step 8: Examine your specimen.
Step 9: After you're done viewing with the lowest power objective, switch to the medium power objective and re-adjust the focus with the fine adjustment knob.
Step 10: Proceed to the high power objective once you have it focused.
A small sample of methane burns, producing co2 and water vapor. as the hot gas mixture expands, it releases 120.0 kj of heat and does 830.0 kj of work pushing against a piston. what is the total amount of energy released in this reaction
A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
What is energy?Energy is a property that is transferred to a physical system, recognizable in the performance of work and in the form of heat and light.
A small sample of methane undergoes combustion. As the hot gas mixture expands, it releases energy (E).
It releases 120.0 kJ of heat. By convention, when heat is released, we assign it a negative sign. Thus, q = -120.0 kJ.It does 830.0 kJ of work. By convention, when the system does work on the surroundings, we assign it a negative sign. Thus, w = -830.0 kJ.The change in the energy is the sum of the heat released and the work done.
ΔE = q + w = -120.0 kJ + (-830.0 kJ) = -950.0 kJ
A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
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what could you and your classmates do to reduce human impact on land
giving brainiest
Answer:
have controlled population!
Explanation:
found as plankton in both marine and
freshwater environments and have a
single simple eye on top of their heads
Answer:
Explanation:
Copepods. The single eye gave them the nickname of "cyclops"
calculate the oxidation state of the underlined elements of K2 Cr2 O7
-----
Answer:
+4
Explanation:
In PbO2, oxygen exhibits an oxidation number of -2 (since it's not a peroxide or superoxide):
Let the oxidation number of Pb be x. Then, for the compound to be neutral, the oxidation numbers of all atoms should add up to zero.
⇒ x + (−2) + (−2) = 0
x = +4
So the oxidation no. of Pb is +4.
I hope this helps.
What is an ionic solid?
A. A crystalline solid held together by a shared electron pool
B. A crystalline solid held together by dipole-dipole forces
C. A crystalline olid held together by covalent bonds
D. A crystalline solid held together by charge attractions
Answer:
D
Explanation:
An ionic solid is a crystalline solid held together by charge attractionsAn example is a salt crystal (Na⁺ + Cl⁻ → NaCl)An ionic solid is a crystalline solid held together by charge attractions or an ionic bond.
What is an ionic bond?
Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.They are good conductors of heat and electricity. They have high melting points. These compounds are brittle.
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A neutral atom of Sodium (Na) has 11 positive protons and 11 negative electrons. When sodium LOSES its outer electron, it becomes a Sodium Ion with a charge of +1. Why is its overall charge now +1?
Given the reaction below, which is the being oxidized? mg cl2 right arrow. mg2 2cl– 2ci– ci2 mg mg2
In the given decomposition reaction of MgCl₂, the oxidized species is magnesium.
What are oxidized species?Those species which goes through the oxidation process by the addition of oxygen or by the removal of hydrogen and electrons are known as oxidized species.
Given chemical reaction is:
MgCl₂ → Mg²⁺ + 2Cl⁻
In the above reaction oxidation of magnesium takes place as they losses electrons and reduction of chlorine takes place as they gain electrons.
Hence magnesium is the oxidized specie.
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Answer: B. Mg
Explanation:
E D G E
What are the forms of energy that are transfer from the abiotic factors to the biotic factors and back to the abiotic factors of an ecosystem
Answer:
sunlight, light energy from the sun
Explanation:
energy is transferred from the sun to plants then animal's eat plants
How may using sorbents to clean an oil spill be helpful to the ecosystem?
Answer:
Are sorbents good for the environment?
Natural Inorganic Sorbents
Second, sorbents that sink should not be used as they could be harmful to the environment. Sinking is a problem with many sorbents, such as untreated peat moss, most inorganic sorbents, and many wood products.
Its major result is to clean out some surface contaminants, which makes it simpler for oil to absorb. On the other hand, pyrolysis, a high-temperature thermal treatment, causes the sorbent to carbonise. In turn, this greatly improves the oil sorption capacity and oil to water selectivity.
What are the advantages of using sorbents?When recovering adsorbent materials that cause secondary contamination, lighter, less viscous oil is lost through the pores more readily than heavier, more viscous oils. Application is simple because sorbents can be applied automatically or manually to spills using blowers or fans.
The best sorbents for recovering oil are typically synthetic ones. In some circumstances, a weight ratio of 40:1 for oil to sorbent can be reached, as opposed to 10:1 for organic compounds and only 2:1 for inorganic materials.
A substance used to absorb or adsorb liquids or gases is known as a sorbent. Examples comprise: a substance that works via adsorption and is comparable to molecular sieve material (attracting molecules to its surface). It has strong thermal conductivity and a big interior surface area.
Thus, On the other hand, pyrolysis, a high-temperature thermal treatment, causes the sorbent to carbonise.
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Calculate the volume occupied by 10 moles of hydrogen gas at 145K and 705 Torr.
2.05 L
14L
128 L
0.007 L
The volume occupied by 10 moles of hydrogen gas at 145K and 705 Torr is 128.01L.
How to calculate volume?The volume of a gas can be calculated using ideal gas law equation as follows:
PV = nRT
Where;
P = pressureV = volumen = number of molesR = gas law constantT = temperatureP = 705torr = 0.93atmV = ?T = 145Kn = 10R = 0.0821 Latm/molK0.93 × V = 10 × 0.0821 × 145
0.93V = 119.05
V = 128.01L
Therefore, the volume occupied by 10 moles of hydrogen gas at 145K and 705 Torr is 128.01L.
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_______ are similar to molecular formulas but show how atoms are bonded together.
Answer
The structural formula are similar to molecular formulas but show how atoms are bonded together.
Explanation:
The structural formula for a compound gives the same information as its molecular formula (the types and numbers of atoms in the molecule) but also shows how the atoms are connected in the molecule.
how many molecules of oxygen are contain in 100 ml of air at NTP? (air contains 21% oxygen by volume
Answer:
600
Explanation:
because if there's 6 molecules in each then 6×100 is 600
Sodium + .... → Sodium sulfate + ....
Answer:
Sodium+ Sulphuric Acid--> Sodium Sulphate+ Water
Please help me and thank you and need this before Monday
How many grams of sodium metal is required to react with 0.950 grams of chlorine gas?
In a reaction involving sodium metal and chlorine gas, the amount of sodium metal required to react with 0.950 grams of chlorine gas would be 0.62 grams
Stoichiometric calculationFrom the balanced equation of the reaction:
2Na (s) + Cl2 (g) ---------> 2NaCl (s)
The mole ratio of Na to Cl2 is 2:1.
Mole of 0.950 grams of chlorine gas = 0.950/70.906
= 0.0134 moles
Equivalent mole of Na = 0.0134 x 2 = 0.0268 moles
Mass of 0.0268 moles Na = 0.0268 x 22.99
= 0.62 grams
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A sealed flask contains 3.82 x 1024 molecules of CO, How many moles of Co, are in the flask?
Answer:
if you meant 3.82* 10^24, the answer is 6.34551495 moles
if you meant 3.28*1024, the answer is 6.49780731*10^-21 moles
since you're going from molecules to moles, you need to divide by Avogadro's number which is 6.02*10^23
The element that doesn't occur in elemental state in nature is
Answer:
technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.
Explanation:
Calculate the concentration of
5 g of sugar dissolved in 20 cm of water
Answer:
25%
Explanation:
I assume you menat 20 cm^3 of water
5 gm / 20 gm = 25 %
1. Set up a Bunsen burner on a heat-proof mat.
2. Take a small piece of magnesium ribbon and place it in some tongs
3. Hold the tongs at arm's length and place the magnesium ribbon in the Bunsen flame.
4. Once the magnesium is burning DO NOT LOOK DIRECTLY AT THE FAME. Magnesium burns very brightly and the light could harm your eyes.
A1. Describe what has been formed
A2. Name the reactants in this chemical reaction.
A3. List all the safety precautions you need to take while carrying out this experiment
Answer:
MAKE ME BRAINLIEST TOOK TIME!!!!
Explanation:
A1) When magnesium reacts with oxygen, it produces light bright enough to blind you temporarily. Magnesium burns so bright because the reaction releases a lot of heat. As a result of this exothermic reaction, magnesium gives two electrons to oxygen, forming powdery magnesium oxide (MgO).
A2) magnesium oxide
A3) Do not return chemicals to their original packaging. An incompatible mixture may accidentally be formed.
Keep chemical containers closed. Dust and vapour may escape from an open container, while gases and suspended material may penetrate this, causing the nature of the chemical to change. This will also avoid unnecessary exposure.
Never use a wrong or an unmarked reagent. If you are unsure about the compound, do not use it. Instead, have it disposed of (see Disposal of Hazardous Waste).
Never put spatulas, stirrers or other objects into a storage container for chemicals. Remove the contents by pouring and rolling the contents of the glass into a beaker, glass container or other suitable equipment. Spatulas may be used with caution in laboratory reagent containers. Remember the labelling (see the Safety Rules for working in lab).
Once removed from the bottle or glass, cork stoppers must be placed on a clean surface (e.g. a watch glass or other suitable equipment) with the opening facing down. This is to avoid contamination of the compound and unnecessary exposure.
Chemical bottles must not be carried by the neck of the bottle, nor next to your body. Suitable carrying arrangements should be employed, e.g. buckets or trolleys.
When pouring from bottles, the label should always face upward to prevent any spillage from destroying the label.
Never put any chemicals in the bottle other than the one indicated on the label.
Special precautions should be taken when handling concentrated acids. Dilution of acids should be performed by pouring the acid into water and stirring continuously.
How many electrons must a sulfur atom gain to achieve an octet in its valence shell?.
Answer:
Answers Anonymous answered Sulfur has 6 valence electrons so it needs 2 more for an octet and it will then have a charge of negative 2
Explanation:
How long is cooked steak good for in the refrigerator?.
Answer:
three to four days
Explanation:
Leftover steak is safe to eat after three to four days in the refrigerator—any longer and you could catch a foodborne illness from bacteria growth. Bacteria can also grow on perishable food that has been left out at room temperature for over two hours or kept at a temperature lower than 40°F.
Consider the following balanced equation:
2KCIO3 → 2KCl + 302
How many grams of O2 will be obtained by decomposing
98.1 grams of KClO3?
Оа
38.4 grams
b
17.1 grams
Ос
25.6 grams
76.8 grams
Answer:
A. 38.4 [gr].
Explanation:
all the details are provided in the attachment, the answer is marked with orange colour.
How do you feel about GM food?
Answer: I think it's ok, but I have a neutral stance on it.
Explanation: Foods are genetically modified to preserve them and I've had my fair share of wasted money and bad expired food, so I'm a-ok on GM food.
Answer:
Well I think that we should use more for tride or give to our allies
Explanation:
How many grams are in 2.3 moles of N?
Answer:
Therefore, 40.4 grams are contained in 2 moles of Neon.
Why would 60g at 10C of NaCl in 200g of water would be unsaturated?
Answer:
The amount of substance needed to saturate water increases as the temperature increases.
Explanation:
Question 76 (1 point)
The volume of a gas is 4.00 liters at 293 K and constant
pressure. For the volume of the gas to become 3.00 liters,
the Kelvin temperature must be equal to
Oь
3.00 x 293
4.00
4.00 x 293
3.00
3.00 x 4.00
293
293
3.00 x 4.00
Ос
Od
Answer:
Yeah yeah i don't know what you want anybody to do with this question because you don't have all of your answers.
How many hybrid orbitals form when three atomic orbitals of a central atom mix?.
Answer:
three _ _E _ _ _
Explanation:
Write down the structural formula for the monomer from which
polyvinyl chloride is derived.
The monomer from which the very common commercial polymer poly vinyl chloride is vinyl chloride with the formula, CH₂Cl = CH₂Cl. The PVC is formed by addition polymerization.
What is polymerization ?Polymerization is the process of combination of smaller molecules or compounds in large number to form macromolecules or polymers. There are a lot of polymers that we are using daily in the form of bags, plastics, bottles etc.
Among the common polymers we use PVC or poly vinyl chloride is very essential commercial polymer. The monomer of PVC is vinyl chlorides.
The polymerization of n vinyl chloride to form polyvinyl chloride is given below.
[tex]\rm n CH_{2}Cl = CH_{2}Cl \rightarrow (-CH_{2}Cl - CH_{2}Cl -)__{n}[/tex]
The polymerization of vinyl chloride is taking place through addition mechanism. The vinyl chloride monomer repeatedly add one by one to form the polymer.
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