Answer:
When barium chloride (BaCl 2) is dissolved in water, the water conducts electricity. In what form will the dissolved BaCl 2 be found? a. as Ba 2+ and Cl - ions b. as Ba atoms and Cl 2 molecules
Explanation:
What would be the minimum energy Emin required to excite a hydrogen atom from its lowest energy level
The minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.
What is excitation?The term excitation has to do with the promotion of an electron from a lower to a higher energy level.
In this case, we are dealing with the hydrogen atom having only one electron. Thus, the minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.
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why does the sloth have both a scientific name and common name
What must happen for carbon dioxide to sublimate at a given pressure ?
Answer:
If the pressure is reduced on the solid carbon dioxide the temperature will drop and the liquid carbon dioxide will solidify into snow-like substance.
Explanation:
What always occurs during a nuclear fission reaction?.
In[7.60x10-³] = In(5.63×10-2) - (k s¯¹)(480 s)
Answer:
I'm not understand that question
I'm so sorry
What is the missing word in this word equation? acid + alkali → __________ + water
⇒Answer:
acid + alkali → salt + water
⇒Explanation:
The acid and alkali neutralize each other to create salt and water. Different acids produce different salts.
Sulphuric acid creates Sulphate salts.
Nitric acid creates Nitrate salts.
Hydrochloric acid creates Chloride salts.
The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.
What is Neutralization Reaction ?A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.
In a neutralization reaction, there is a combination of H⁺ ions and OH⁻ ions which form water.
Therefore, The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.
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a person who eats three servings of the cereal without milk will consume__ calories__ grams of carbohydrates
A person who eats three servings of the cereal without milk will consume about 117 percent of calories.
What is Calorie?This is defined as a unit of energy and is commonly used in the body system.
One serving of cereal without milk will contain 39 percent of calories while three servings will be 117 percent.
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What is the concentration of hydronium and hydroxide ions in pure water at 25°c.
Explanation:
The concentration of hydronium and hydroxide ions are equal in pure water at 25 degree Celsius. Bringing the pH of pure water to be 7.Is Hibiscus tea good for ACNE?
Answer:
Y E S
Explanation:
Hibiscus tea has plenty of skin care qualities, from helping your natural levels of collagen and elastin to reducing breakouts to balancing oil production. Hibiscus is known for its rich level of antioxidants, including vitamin C and beta-carotene.
I hope this helps ✍(◔◡◔)
Boxes on trees in swamps give wood ducks a place to build their nests platforms built on top of telephone poles provide a place for eagles to make their nests
in backyards and parks, people may set up houses for bats, birds, or toads how do these artificial homes affect resources in the animal's environments? how
does this in turn affect population size?
These artificial homes preserve the resources in the animal's environment and increases population size.
What is Population size?This is defined as the number of organisms in a population at a given place and time.
Since the resources used are artificial, they are preserved with an increase in the population due to reproduction.
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Which two phase changes occur when you increase the heat?
Answer:
Heat going into a substance changes it from a solid to a liquid or a liquid to a gas. Removing heat from a substance changes a gas to a liquid or a liquid to a solid.
Liquid → Gas:
VaporizationGas → Liquid:
CondensationSolid → Liquid:
Melting or fusion
Solid → Gas: Sublimation
Explanation:
After learning about climate change in her science class, selena wants to make a few changes at home so she can affect climate change in a small way. which changes will give her the best results?
Selena can change from burning fossil fuel in her home to using solar energy.
What causes climate changes?Climate change is caused by the release of the greenhouse gases which is gotten through the use and burning of fossil fuels such as coal.
The use of solar panels and solar energy by Selena in her house can help adjust the climate changes by decreasing the amount of greenhouse gases released into the atmosphere.
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Can anyone help me figure this out
Answer:
go with the fourth one because I did that one
calculate the number of moles of nitrogen monoxide gas used to form 72.0 grams of water vapor.
4 moles of nitrogen monoxide gas used to form 72.0 grams of water vapor.
What is a mole ?A mole is the measurement unit which is used to correlate the molar mass with number of molecules present.
The equation for reaction of Nitrogen monoxide to form water vapor is given by
4NH₃ + 6NO ----> 5N₂ + 6H₂O
72 grams of water vapor means = 72/18 = 4 mole of water vapour
The mole fraction of NO to H₂O is 6 : 6
Therefore for 4 moles of water vapor formation , 4 moles of nitrogen monoxide will be required.
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Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
3.96 * 0.1159 = [?]
The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)
Meaning of Significant figures and the rule of engagementSignificant figures can be defined as numbers in a group of numbers that place number in the right value or worth.
Significant figures defined the value of measurement of a particular number.
The rules of engagement in this case is the set of rules or laid down principles that direct how we interact with this significant figures and how they are used.
For this case the significant figures of the product will be the same as the figure with the least significant figure in the multiplication.
In conclusion, The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)
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In a simple distillation setup, what is the sequence of equipment from the bench top to the round bottom flask
In a simple distillation setup, the sequence of equipment from the bench top to the round bottom flask is:
ThermometerDistillation flaskLiebig condenserRound bottom flaskBunsen burnerWhat is Distillation?This is the process in which a mixture is separated through selective boiling and condensation.
The distillation flask and liebig condenser are usually located above the round bottom flask in the set up.
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PLEASE I REALLY NEED HELP!!! ITS NOT MULTIPLE CHOICE BTW :'(
A 76.0-gram piece of metal at 96.0 °C is placed in 120.0 g of water in a calorimeter at 24.5 °C. The final temperature in the calorimeter is 31.0 °C. Determine the specific heat of the metal. Show your work by listing various steps and explain how the law of conservation of energy applies to this situation.
Answer:
660J/kg.°C
Explanation:
Using the fact that
∆E of metal + ∆E of water = 0
∆E of the metal = Q = m*c*(T2-T1)
Where
Q = heat lost or gained = ?
m = mass of metal in kg = 0.076kg
c = specific heat of the metal = ?
T1 = 96°C
T2=31°C
∆E of the water=Q= m*c*(T2-T1)
Where
Q = 0.120*4180*6.5 = 3260J
Therefore
3,260J + Q of the metal =0
3,260J + 0.076*C*(31.0–96.0)=0
3,260J - 4.94c = 0
3,260 = 4.94c
3,260/4.94 = c
660J/kg.°C = specific heat of the metal
hope this helps:)
Some scientists believe that the mass extinction of dinosaurs was caused by the impact of a large meteorite on earth. this impact would have caused a darkening of the sky due to dust blown into the upper atmosphere. this darkening would have reduced the sizes of some ecosystems because of
The darkening of the atmosphere caused by meteorites would have reduced the sizes of some ecosystems due to less solar energy being available to plants.
What is Solar energy?This is the form of energy which is derived from the sun and is usually trapped by plants during photosynthesis.
Plants being primary producers will have less photosynthetic activity thereby leading to less food production and oxygen availability.
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350.0-mL of 0.50 M hydrogen sulfate solution is reacted with 15.0 grams of sodium hydroxide. What volume of water will be produced?
The volume of water that will be produced from the reaction will be 6.3 mL
Stoichiometric calculationFrom the equation of the reaction:
[tex]H_2SO_4 + 2NaOH --- > Na_2SO_4 + 2H_2O[/tex]
The mole ratio of hydrogen sulfate to sodium hydroxide is 1:2.
Mole of hydrogen sulfate = 0.50 x 350/1000 = 0.175 moles
Mole of 15 grams sodium hydroxide = 15/40 = 0.375 moles
Thus, hydrogen sulfide is the limiting reagent.
Mole ratio of hydrogen sulfide to water = 1:2.
Equivalent mole of water = 0.175 x 2 = 0.35 moles
Mass of 0.35 moles of water = 0.35 x 18 = 6.3 grams.
1 gram of water = 1 ml.
Thus, 6.3 grams of water will be equivalent to 6.3 mL
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How many grams are in 4 moles of H2O?
Answer:
There are 72grams in 4 moles of H20
In industrialized states every tenth adult suffers daily, and every third occasionally, from heartburn. In Germany almost ten million people are affected by this disease. Helpful medicines against heartburn are the so-called ‘antacids’.
Antacids bound acids against an over-acidification of the stomach. The stomach acid contains hydrochloric acid (HCl, dissolved in water), which reacts with the antacid to form water, carbon dioxide and the corresponding salt. Generally, antacids are carbonates. Very common is ‘Bullrichs salt’, which uses sodium hydrogen carbonate as active ingredient. A single dose of an antacid is to be chosen in a way that it will react with two grams of hydrochloric acid. You are to formulate the instruction leaflet for a pharmaceutical company, which sells calcium carbonate (CaCO3) as an antacid. The dosing instruction says that in case of heartburn, one tablet with sufficient water is to be ingested.
But the specification, how many grams of calcium carbonate one tablet contains, is still missing…
Answer:
Antacids are medicines that counteract (neutralise) the acid in your stomach to relieve indigestion and heartburn. They come as a liquid or chewable tablets and can be bought from pharmacies and shops without a prescription.
Unit 8 Multiple Choice Questions
1. Which statements regarding the presence of greenhouse gases in the
atmosphere is a FALSE statement?
4
OA. The atmosphere is mostly non-greenhouse gases
OB. The atmosphere contains a small amount of greenhouse gases
C. The atmosphere has never changed
O
D. The greenhouse gases in the atmosphere have a large impact on the Earth's
climate.
This is a required question
Answer:
C
Explanation:
just did it
when 2 moles of C6H6 react with excess Oxygen gas, how many moles of water are produced?
C6H6 + 9 O2 ------> 6CO2 + 6 H20
Answer:
12 moles H₂O
Explanation:
To find the amount of water produced, you need to use the given amount and multiply it by the mole-to-mole ratio from the equation. These numbers are the coefficients of the molecules you are converting from and to. When writing the ratio, make sure to arrange it in a way that allows for the cancellation of units.
1 C₆H₆ + 9 O₂ ----> 6 CO₂ + 6 H₂O
2 moles C₆H₆ 6 moles H₂O
--------------------- x ------------------------- = 12 moles H₂O
1 mole C₆H₆
PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
ITS B
Explanation:
MY CONSCIOUS MIND IS TELLING ME
Jupiter revolves around the sun in a predictable pattern because
At what temperature would 0.46 moles of a gas occupy 13.3 L if the pressure is 734 mm Hg?
Answer: 339.84 K
Explanation:
[tex]$$We are given: \\$\mathrm{n}=0.46$ moles \\$V=13.3 \mathrm{~L}$\\$\mathrm{P}=734 \mathrm{~mm} \mathrm{Hg}=0.965 \mathrm{~atm}$\\Putting these values in ideal gas equation we get:\\$0.965$ batm * $13.3 \mathrm{~L}=0.46 \mathrm{~mol} * 0.0821 \frac{\mathrm{atmL}}{\mathrm{molK}} * \mathrm{~T}$\\$\mathrm{T}=\frac{0.965 * 13.3}{0.46 * 0.0821} \mathrm{~K}$$$\mathrm{T}=339.84 \mathrm{~K}$$[/tex]
What is the molar mass of H₂CO₂?
Answer:
I think the Molar mass of H₂CO₂ should be 62..
Explanation:
I'm not too sure tho... Hope this helps!
compare molecular & covalent network crystal solid?
Answer:
Molecular solids and covalent network solids are two types of solid compounds. The key difference between molecular solid and covalent network solid is that molecular solid forms due to the action of Van der Waal forces where as covalent network solid forms due to the action of covalent chemical bonds.
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Which of the following atoms require the greatest amount of ionization energy? Cu, Ag, or Au
Ionization energy is the periodic property of an element. The copper atom has the highest ionization energy among gold and silver atom.
What is ionization energy?Ionization energy is the amount of energy required for the removal of the loosely bounded electron from an atom. The ionization energy can be first, second, and third based on the number of electrons.
Ionization energy down the group decreases from top to bottom as the atomic radii of the element increase. So, the ionization energy for the given elements is Cu > Au > Ag.
Therefore, copper has the highest ionization energy.
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Which are examples of biotic factors? Select three options.
rotting log
stream water
dead leaves
bacteria
soil
The biotic factors are bacteria soil, dead leaves, and stream water.
What is an abiotic factor?An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Biotic and abiotic factors make up a community via interaction.
Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.
The dead leaves of plants are an abiotic factor, the bacteria in soil are living matter and stream flowing, etc.
Hence, the biotic factors are bacteria soil, dead leaves, and stream water.
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