A typical example of metal ore is copper which is used for production of electrical wires.
What are metal ores?Metal ores are defined as the metals that are naturally deposited at the earth crust which can serve as a valuable resources for many industries.
The copper is a typical example of a metal ore which is a good conductor of electricity used for production of electrical wires.
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what is the half life of a radioactive sample if 100.0 grams of it decays to 12.5 grams in 24.3 hours
The Half-Life of the radioactive sample is 8.1 hours.
What is half life of a radioactive element?The half-life of a radioactive substance is the time taken for half the amount of atoms in the given substance to decay.
12.5 grams remains out of 100 grams of the sample.
This is 1/8 of the original samples.
1/8 of the original sample reperesent three half-lives undergone.
Half-Life of the radioactive sample = 24.3/3 = 8.1 hours
Therefore, the Half-Life of the radioactive sample is 8.1 hours.
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6. Explain the impact on fresh water of:
a. Farming wastes
b. Household pollutants
c. Industrial wastes
d. Erosion
e. Oil and Gasoline
f. heat
7. In your opinion which of the above-mentioned pollutions is more dangerous?
Fresh water pollutants are substances which pollute fresh water and industrial waste, is most harmful fresh water pollutant to man and aquatic organisms.
What are pollutants?Pollutants are substances which cause harm when they are present in the environment.
Pollutants include chemicals such as petroleum and material such as sewage.
The presence of pollutants in freshwater results in water pollution and make the water unfit for drinking purposes and also harms aquatic life in freshwaters.
Some freshwater pollutants include:
Farming wastesHousehold pollutantsIndustrial wastesErosionOil and GasolineheatOf these pollutants, the most dangerous fresh water pollutant is industrial wastes as they kill aquatic organisms most due to the presence of harmful chemicals in them.
Therefore, fresh water pollutants such as industrial waste is most harmful to man and aquatic organisms.
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What will be the efficiency of a machine which has an energy loss of 10%
The efficiency of the machine which has an energy loss of 10% is 90%
What is efficiency?This can be defined as the capacity to achieve a given task with little or no waste. Mathematically, it can be expressed as
Efficiency = (output / input) × 100
How to determine the efficiencyWe shall assume the following:
Input = 100 JOutput = 100 – 10 = 90 JEfficiency =?Efficiency = (output / input) × 100
Efficiency = (90 / 100) × 100
Efficiency = 90%
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how do you treat a sulfuric acid burn with sodium hydroxide
Common Tasks for Chemists.
Answer:
analysis organic and inorganic compounds,refine substances and chemicals products
please solve ...................................................................
Answer:
Explanation:
Part (c)
Mix together two suitable solutions.
Use filtration to separate the precipitate as a residue from the solution.
Wash the precipitate with distilled water while it is in the filter funnel.
Leave the washed precipitate aside or in a warm oven to dry.
Part (d)
Pb(NO3)2 (aq) + Na2SO4 (aq) → 2 NaNO3 (aq) + PbSO4 (s)
What can scientists learn from radiometric dating?
A- how long ago a plant or animal lived
B- how much time it took a fossil to form
C- where a plant or animal lived
D- whether a fossil has modern relatives
Answer:
A- how long ago a plant or animal lived
The volume of a gas is 6.10 l, measured at 1.50 atm. what is the pressure of the gas in
mmhg if the volume is changed to 9.74 l?
Answer:
713.96mmhg
Explanation:
p1v1=p2v2
6.10×1.50/9.74
=0.939atm
=0.939*760
=713.96mmhg
The general form AB àA + B represents which type of reaction?
Answer:
hope this helps and if you have any questions please feel free to ask me any time
Draw the Lewis structure for ClO.
The Lewis Structure for ClO. is attached in the image.
What is Lewis Structure ?Lewis structure represents the structure of atoms or molecules with their valence electron.
It is a two-dimensional model that helps us to know, how many bond pairs and a lone pair a molecule contains.
Lewis structure of ClO⁻ is very simple to draw as it has only two atoms(chlorine and oxygen), we have to just represent the valence electron around them and complete their octet.
1. Count total valence electron in ClO-
Total number of the valence electrons in chlorine = 7
Total number of the valence electrons in oxygen = 6
Total number of valence electrons = 7 + 6 + 1 = 14 valence electrons
[∴one oxygen atom, one chlorine, and one negative charge that count as a one valence electron]
2. Find the least electronegative atom and placed it at center
Connect outer atoms to central atom with a single bond Cl-O bond
Now count the valence electron in the above structure.
Single bond means two-electron , only one single bond is used.
Hence, only 2 valence electrons are used in the above structure from 14 total valence electrons available for drawing the lewis structure of ClO-.
(14 – 2) = 12
We have left with 12 valence electrons more.
3. Place remaining valence electrons starting from outer atom first
So, put the valence electron around the chlorine and oxygen.
we put 6 electrons around chlorine and oxygen, as each of them already sharing 2 electrons with the help of a single bond between them.
The structure can be seen in the figure attached.
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What is an example of service in the cement industry
Answer:
What kind of industry is cement industry?
The cement industry is one of the main industries necessary for sustainable development. It can be considered the backbone for development. The main pollution source generated from cement industry is the solid waste called cement by-pass dust, which is collected from the bottom of the dust filter.
Explanation:
In a neutralization reaction, an aqueous solution of an arrhenius acid reacts with an aqueous solution of an arrhenius base to produce:.
An aqueous solution of an arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt.
What is a Salt?This is a compound which is formed as a result of a neutralization reaction between acid and base.
Arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt due to increased concentration of H+ and OH- respectively.
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The distance between city A and city B is 22 miles. The distance between city B and city C is 54 miles. The distance between city A and city C is 51 miles.
What type of triangle is created by the three cities?
an acute triangle, because 222 + 542 >512
an acute triangle, because 222 + 512 >542
an obtuse triangle, because 222 + 542 >512
an obtuse triangle, because 222 + 512 >542
The type of triangle that is created by the three cities is an obtuse triangle, because 22 + 51 > 54.
What is an obtuse triangle?
Obtuse triangle is a type of triangle in which any of its angle is greater than 90 degrees, and the sum of the interior angles must by equal to 180 degrees.
Considering length AB and AC = 22 miles + 51 miles = 73 miles
The sum of length AB and AC is greater than length BC, and the opposite angle of side BC is greater than 90 degrees.
Thus, the type of triangle that is created by the three cities is an obtuse triangle, because 22 + 51 > 54.
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how does air move around the earth
I need help please;-;
The order of increasing reactivity of the metals is: magnesium, sodium, and potassium.
How does the reactivity of metals increase?The reactivity of metals increases as one goes down the group and increases from right to left in th periodic table.
For the three elements, sodium potassium, and Magnesium, the least reactive is magnesium while the most reactive is potassium.
This is because of increase in reactivity based on the properties of the elements.
Therefore, the order of increasing reactivity of the metals is: magnesium, sodium, and potassium.
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1. If the pressure of a fixed volume of gas decreased in a sealed container, what variable would you think changed? did this variable increase or decrease?.
Answer:
Temp decreased
Explanation:
If the container is sealed and the pressure DEcreases, then the temperature DEcreased
PV = n RT n R V are constant if P goes down then so does T
From the dissolution of a gas sample, two more gases were obtained, namely 150 cm3 of N2 and 450 cm3 of H2 .What is the formula for dissolved gas.
What happens when light enters water?
A. It’s speed stays the same
B. It speeds up
C. It can’t get back out
D. It slows down
Answer:
It slow down
It slow down when it passes from the less dense air into the denser glass or water
Assume that your electrical power company gets its energy from a hydroelectric dam. Outline all of the energy changes that occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.
Answer:
See explanation.
Explanation:
This isn't chemistry. Its physics. Kinetic energy (water) to electric energy (dam) as the hydroelectric dam works. Then, as the current travels from the plant to your crib, electric energy to heat energy (wire resistance). Then when you are using the dryer electric energy to heat energy (hot air) and sound energy (air particles vibrate due to the heat energy).
please help
Which statement is true about a nickel-cadmium dry cell?
The anode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.
The cathode reaction is Cd+2OH−→Cd(OH)2+2e−.
The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.
The cathode reaction is Cd+NiO2+2H2O→Cd(OH)2+Ni(OH)2.
Answer:
I think I answered this already but I'll put it again:
The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.
For compounds of similar size and/or molar mass, which attractive force would result in the highest melting point
The compounds with high Intermolecular forces , will result in the highest melting point.
What is Melting Point ?The temperature at which the solid and liquid form of a solvent are in equilibrium and applying any more heat will lead to melting of the solid into liquid is called Melting Point.
The Intermolecular force that would result in highest melting point is the Ion-Ion interaction , the more the bonding the higher will be the melting point.
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Ahmed doesn't believe in electromagnetism so he makes an electromagnet to prove his teacher wrong. To his surprise, the electromagnet works and he's able to pick up metal objects with it. Even still, he's not satisfied with his electromagnet because it's very weak. What can he do to make it stronger?
Answers: use a weaker battery
1. use a stronger battery
2. use a plastic nail
3. glue the wire to the nail
4. wrap the wire around the nail fewer times
Answer:
1) Use a stronger battery
Explanation:
I'm going to quote Northeastern University (I could try to type out an explanation but this will probably be more concise)
"Electromagnets are made of coils of wire with electricity passing through them. Moving charges create magnetic fields, so when the coils of wire in an electromagnet have an electric current passing through them, the coils behave like a magnet."
4) So, if the coils are creating a moving charge, and there are more coils, each coil will be "setting up" its own magnetic field. This means that less coils will make the electromagnet weaker
2) Because it is an electromagnet, a plastic nail is not going to produce the same effect. An electromagnet is picking up metal, and it is not picking up plastic. This is because plastic (a material with low permeability) does not have a magnetic field that is able to interact with a magnet.
[Permeability is a measure of how easily magnetic lines of force can pass through a material.]
3) There's not really a point that I can imagine of gluing the wire to the nail. Glue would put more distance between the nail and the magnet than nothing being there at all.
1) More voltage in a battery produces a larger current in the wire. This means that the strength of an electromagnet is affected by the voltage/strength of the battery. So, a stronger battery would make the electromagnet stronger, and a weaker battery would make the electromagnet weaker.
The electromagnet works, and he's able to pick up metal objects with it, he does to make it stronger to use a stronger battery. Therefore, option 1 is correct.
What is electromagnet ?An electromagnet is a type of magnet where an electric current creates the magnetic field. The wire that makes up an electromagnet is typically twisted into a coil. A magnetic field is produced by a current flowing through the wire and is concentrated in the hole in the center of the coil.
Electrical devices including motors, generators, speakers, computers, and MRI machines cannot be built without electromagnets. They are well known for their ability to lift and move heavy magnetic objects, such as scrap iron.
Many electromagnets have an advantage over permanent magnets because they can be easily turned on and off, and increasing or decreasing the amount of electricity flowing around the core can control their strength.
Thus, option 1 is correct.
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How does the kinetic energy of solids, liquids, and gases compare?
OA. Gases have no kinetic energy, solids have a little, and liquids have
the most.
O
B. Gases have the same kinetic energy as liquids, which is more than
solids.
O
C. Gases have the highest kinetic energy, followed by liquids, and
then solids.
O D. Gases have the lowest kinetic energy, followed by liquids, and then
solids.
Answer:
Gases have the highest kinetic energy, followed by liquids, and then solids.
Explanation:
Question:How does the kinetic energy of solids, liquid, and gases compare ?
Context:Higher kinetic energy causes particles to vibrate or move around faster. Solids have the lowest kinetic energy so vibrate very little.
Liquids have more kinetic energy so particles slide past each other.
Gases have the most kinetic energy so fly around in the air.
Answer:
C
Explanation:
you can relate this with their temprature, more kinetic energy means more movement of molecules. This creates heat which then melts or vaporizes substances. So, as K.E increases a substance will change from solid to liquid and eventually gas.
I have ten moles of iron atoms in the reactant side of a reaction. Do I have enough information to determine how many moles of iron atoms I will have following the reaction? If so, how many moles of iron atoms will I have at the end of a reaction? If not, what else do I need to know?
Answer:
See below
Explanation:
If your reaction equation is balanced, you will know the number of Fe atoms following the reaction.....it will be the same on both sides of the equation.
Limonene is a volatile liquid which smells of oranges.
A teacher placed a beaker of limonene at the front of a classroom.
At first, the students at the back of the classroom could not smell the limonene.
After two minutes, the smell of limonene had spread throughout the classroom.
The air in the classroom was still and calm.
Explain these observations using the kinetic particle model.
Answer:
(limonene) particles go from liquid to vapour
diffusion
random movement of particles / particles move anywhere / particles move in all directions
spreading out of particles / intermingling of particles / mixing of particles / particles collide / particles bounce off each
other / particles go all over
(bulk) movement of particles from higher to lower concentration / movement of particles down concentration gradient
Which planet do scientists believe prevented the asteroids in the asteroid belt from forming a planet?.
The planet that scientists believe prevented the asteroids in the asteroid belt from forming a planet is Jupiter.
What are asteroids?
Asteroids are known to be leftovers from the formation of the solar system for about 4.6 billion years ago.
Why Jupiter prevented asteroids
The gravity in Jupiter is so strong, that it caused the instability of asteroid orbits within the Kirkwood gapsIt prevented planetary bodies from forming in between Mars and itselfIt also caused small objects to collide with each other and fragment into the asteroids seen todayTherefore, Jupiter made asteroids form group of debris, rather than forming a planet.
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How to balance the equation Mg2+HO2=Cu3O+H2
How many moles of ch4 are contained in 96. 0 grams of ch4.
Answer:
6 mol
Explanation:
Discussion
The answer is very nearly six. I will use rounded whole numbers to get the molar mass. Every periodic table is different so you will have to redo my numbers using your periodic table.
The trick is to find 1 mole of CH4 and divide that into 96.
Givens
96.0 grams of CH4
Solution
Find 1 mol of CH4
1 * 1C = 1 * 12 = 12 grams of Carbon in 1 mol of CH4
4 * H = 4 * 1 = 4 grams of Hydrogen in 1 mol of CH4
Total = 16 grams of C and H in 1 mol of CH4
Find 96 grams in mols.
Formula
mol = given mass / molar mass
given mass = 96 grams
molar mass = 16 grams
Mol = 96 / 16
Answer: mol = 6
Examine the map and then answer the question.
North Sea
B
Allante
Ocean
A
Mediterranean
Otto von Bismarck united small independent states in which region?whats the answer
In 1867, Otto von Bismarck created the Northern Confederation, a combination of the northernmost German states beneath Prussian rule.
Who Was Otto Von Bismarck?The "Iron Chancellor," Otto von Bismarck (1815–1898), oversaw the unification and modernization of Germany. He virtually ruled Prussia and then all of Germany between 1862 until 1890. To unify the 39 autonomous German states under Prussian control, great strategist Bismarck launched decisive wars with France, Austria, & Denmark.
In 1864, Bismarck began the series of wars that'd make Prussia the most powerful country in Europe. He invaded Denmark to seize control of the German-speaking province of Schleswig-Holstein, and two years later he persuaded Emperor Franz-Josef I to start the Austria- War (1866), which brought about an immediate defeat for the faltering Austrian empire.
Thus, on 1867, Otto von Bismarck created the Northern Confederation, a combination of the northernmost German states beneath Prussian rule.
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What is a real-life example of equilibrium and what would happen if there was a shift in the system of that example?
Answer:
Refrigerator
Explanation:
Think about it. Equilibrium is between 2 "places", and if you didn't open the fridge, there would be a buildup of cold air.
Because of that buildup, it would keep getting colder until it isn't possible to get cold anymore. That is equilibrium.
However, if you were to open the door for a very, very long time, you would lower the temp. inside the fridge, therefore causing for the room you are in to be slightly colder, and the fridge to decrease in cold. The fridge will still be slightly cold, but it won't be lukewarm if you leave it for 2 hours. (Unless it's broken)
That is equilibrium :)