Cooled in ice to help the water vapour condense. Tube 2 – contains lime water, goes cloudy to show the presence of carbon dioxide. Word equation: (hydrocarbon + oxygen → carbon dioxide + water) Methane + oxygen → carbon dioxide + water.
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Answer:
True True False
Explanation:
En qué consistió el experimento de Rutherford?
Answer:
The gold foil experiment
El experimento de la lámina de oro
Explanation:
What does the respiratory system do?
Answer:
Your lungs are part of the respiratory system, a group of organs and tissues that work together to help you breathe. The respiratory system's main job is to move fresh air into your body while removing waste gases.
Answer:
Supply the body with Oxygen
Explanation:
The respiratory system helps remove waste gases and help you breath
(Your respiratory system consists of your lungs, mouth, and windpipe)
electronic configurations and charges of the ions
in lithium fluoride?
Answer:
Explanation:
The electronic configuration of a lithium atom is 2.1 and that of a fluorine atom is 2.7
an atom of lithium donates an electron to an atom of fluorine to form an ionic compound. The transfer of the electron gives the lithium ion a net charge of +1, and the fluorine ion a net charge of -1.
6. The redox reaction that occurs during the operation of a battery is best described as
1) non-spontaneous and occurring in a chemical (voltaic) cell
2) spontaneous and occurring in a chemical (voltaic) cell
3) non-spontaneous and occurring in an electrolytic cell
4) spontaneous and occurring in an electrolytic cell
Answer:
1
Explanation:
The redox reaction that occurs during the operation of a battery is best describes as non-spontaneous and occurring in a chemical (voltaic) cell.
What is a redox reaction?Redox reactions are those reactions in which oxidation or reduction reaction occurs. In these reactions, losing of an electron occur.
An example is formation of hydrogen fluoride.
Thus, the correct option is (1) non-spontaneous and occurring in a chemical (voltaic) cell.
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Which happens when a reversible reaction reaches a state of chemical equilibrium?
A. The system runs out of reactant particles.
B. The concentrations of reactants and products are equal.
C. The activation-energy barrier is eliminated.
D. The rates of forward and reverse reactions are equal.
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Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.
Hope This Helps You ❤️'The function of an organism as a whole is organ of the combined activities and interaction of the constituent of the cells.' give reason
Answer:
Because organism is made up of organs
organs are made up of tissues
tissues are made up of cells
Therefore interaction of cells give outcome to tissue which further show's results in organs and to organ system and then to the body as a whole
Explanation:
Help Me Please , I'm hopeless
Answer:
F
Explanation:
Please help!!! Best answer will get brainliest
Given the unbalanced equation: Li + N2 -> Li3N When the equation is
correctly balanced using smallest whole numbers, the coefficient of the
Lithium is
A.1
B.2
C.3
D.6
Answer:
D) 6
Explanation:
The balanced equation would be:
6Li + N2 -> 2Li3N
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the correct option is option D.
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
The other characteristic of balanced reaction is that physical state should be written with each compound or molecule on reactant and product side. Physical state should be written in brackets. s means solid, l means liquid, g means gas.
The skeletal equation is
Li + N[tex]_2[/tex] [tex]\rightarrow[/tex] Li[tex]_3[/tex]N
The number of atoms of nitrogen on reactant side is 2 while on product side it is 1 so to balance
Li + N[tex]_2[/tex] [tex]\rightarrow[/tex] 2Li[tex]_3[/tex]N
The lithium atom on reactant side is 1 while on product side it is 6, so to balance
6Li + N[tex]_2[/tex] [tex]\rightarrow[/tex] 2Li[tex]_3[/tex]N
The coefficient of the Lithium is 6.
Therefore, the correct option is option D.
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.How many moles of NaCl are in 28.0 g?
Answer:
0.48 mols
Explanation:
to convert moles to mass u need to divide mass by the molar mass of NaCl which is 58.44g/mols.
28g ÷ 58.44g/mol = 0.48 mols
What kind of nuclear reaction occurs in the following reactions?
Answer:
No 1 is fission
while no 2 is fusion
Fission is splitting on nucleus while fusion is forming heavier nucleus with nuclei
The kind of nuclear reaction that occurs in the following reactions are:
i. nuclear fission
ii. nuclear fusion.
What is a nuclear reaction?Nuclear reactions are that reactions in which a nucleus or nuclei collides with subatomic particles to form another, different nucleus. There are two types of collisions. Nuclear fission and nuclear fusion.
Nuclear fission is a process when large nuclei split and create small, numerous nuclei. It happens due to the instability of an atom. It split into two daughter nuclei.
Nuclear fusion is a process in which two or more small nuclei combine to create a large, heavy nucleus. The process releases a large amount of energy or can be absorbed.
Thus, the processes are i. nuclear fission
ii. nuclear fusion.
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What happens to wavelength as wave frequency increases?
Answer:
As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
Explanation:
for the oxidation of iron to form iron(iii)oxide
4Fe(s)+3O2(g)=2Fe2O3(s) deltaS^o=-549.73J×K^-1 at 298K
the enthalpy of formation of Fe2O3(s) is -824.2 kj×mol^-1. what is the standard change in gibbs free energy for this reaction at 298K? Delta G^o=delta H^o-T delta S^o
Answer:
only god knows the answer
The Gibbs free energy is given by the change in enthalpy, temperature, and change in entropy. The standard change in Gibbs free energy for oxidation of iron is –1484.6 kJ.
What is Gibbs free energy?Gibbs free energy is the energy present in a thermodynamic system that is used by the reactant to form a product. It is given as,
Δ G° = Δ H° -T ΔS°
The oxidation reaction of iron is given as,
4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)
Given,
ΔS° = –549.73 J∙K⁻¹
T = 298 K
Δ H° = –824.2 kJ∙mol⁻¹
Substituting values above the Gibbs free energy is calculated as:
Δ G° = Δ H° -T ΔS°
= –824.2 kJ∙mol⁻¹ - 298 K ( –549.73 J∙K⁻¹)
= -1484580.46 J
The units of joules are converted into kilojoules and the standard change in Gibbs free energy will be –1484.6 kJ.
Therefore, –1484.6 kJ is the Gibbs free energy.
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How much energy does a photon of frequency 6 x 10^12 Hz have?
A. 2.21 x 19^-42 J
B. 3.98 x 10^-21 J
C. 1.988 x 10^-25 J
D. 1.10 x 10^-46 J
Answer:
B.3.98x10^-21 JExplanation:
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Which of the following is the most common source of pollution?
oil
coal
nuclear
gas
Answer:
Coal puts out more Co2 emissions than Oil or Gas and Nuclear energy plants don't put out any pollution.
Explanation:
Even though Coal is your answer it is actually a very clean form of generating energy. Not only is it very clean but it is the most effecient means. Solar and Wind power can't even come close to the production and turnover that Coal, Gas, and Oil can. Wind Turbines are so innefficent that they somtimes don't even pay off what it took to build them in thier lifetime of service. The production of Wind Turbines puts out more pollution than any of the Coal or Natural Gas Plants. Solar power is not very efficent either but it is on it's way. It is also very expensive.
help me pleaseeeee #5
Answer:
Red
Explanation:
Help with science!!!!
Answer:
the answe would be (c) temperate continental
Explanation:
A liquid changes color as it cools and becomes solid. How can you confirm
the type of change that took place?
A. Determining that the mass of the solid and liquid are different
would confirm that a chemical change took place.
B. Identifying the solid and liquid as the same substance would
confirm that a physical change took place.
O c. The color change and the formation of a solid confirm that a
chemical change took place.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Answer: Hello, There! your answer is Below.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Explanation:
The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.
Hope this helps you!!!
Have a great day!!!
When a liquid undergoes solidification and change of phase it is called freezing. The physical change can be confirmed by changes in the state of matter from liquid to solid. Thus, option D is correct.
What are physical changes?Physical changes are the modification in the matter or object that can be reversed back to its original state. They do not produce substances that are irreversible.
The change of the phase of the matter from liquid to solid when water substance undergoes freezing is a physical change as no new compound is created and the solidified substance can get converted back to liquid.
Therefore, option D. solid from liquid shows a physical change.
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what are specatator ions
Answer:
A spectator ion is an ion that does not participate in a chemical reaction and is found in a solution before and after a reaction.
Hope this helped :)
1
Explain how adding crushed limestone reduces the acidity of the soil. Include a
general equation for the reaction.
Answer:
If a soil test indicates low magnesium, dolomitic limestone can be used to correct both the nutrient deficiency and pH. The value of limestone is in its ability to neutralize soil acidity. Limestone's properties differ considerably, and these differences influence the limestone's ability to neutralize soil acidity.
Explanation:
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When [H+] = 3.33 x 10-7 what is the ph?
Answer:
6.48Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log ([ {H}^{+} ])[/tex]
From the question we have
[tex]pH = - log(3.33 \times {10}^{ - 7} ) \\ = 6.477555...[/tex]
We have the final answer as
6.48Hope this helps you
I need y’all’s help please
Answer:
6 mass
Explanation:
because the si unit of gram is mass
mixture of same boiling point cannot be separated by using distillation why?
Answer:
both the substances will evaporate
Explanation:
I need help with science pls help me :(!
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Imagine your cell phone rings. Describe how the sound gets transmitted from your phone to your ear, and then, from your ear to your brain. In your response, be sure to mention the type of wave that a sound wave is, the medium the sound is transmitted through before it gets to your ear, and what happens in your ear once the sound reaches it.
Answer:
String a piece of twine between the cups. Use a long piece of string to help the sound travel farther. Tie a knot in the end of the string to keep it in the cup. Decorate the cups if desired. One person can hold the phone up to their ear and the other person can talk into the other cup. Keep the string tight or the sound waves won’t travel.
Explanation:
Three categories of factors that cause illness or injury are shown here. Match each example on the right to its correct match on the
left.
A baby is born with an abnormal number of chromosomes.
Angela was badly injured in a car accident after her air bag
exploded.
Alex forgot to get a flu shot and missed two weeks of school
with the flu. Answer choices pathogenic agents, genes , environmental factors
Answer:
Alex forgot to get a flu shot and missed two weeks of school
What is the molarity of a 0.4 liter solution containing 1.6 moles of NaCl?
Answer:
4 M
Explanation:
Molarity refers to the molar concentration of a substance (solution). It can be calculated by using the formula below:
Molarity (M) = number of moles (n) ÷ volume (V)
According to the information provided in this question;
V = 0.4 liter
n = 1.6 moles
Molarity = n/V
Molarity = 1.6/0.4
Molarity = 4 M
A sample of pure water contains
A. a smaller concentration of H3O+ ions than OH- ions.
B. a larger concentration of H3O+ ions than OH- ions.
C. equal concentrations of OH- and H3O+ ions.
D. neither OH- ions nor H3O+ ions.