Answer:
The main purpose for converting numbers into scientific notation is to make calculations with surpisingly large or small numbers less complicated. Since zeros are not used to place the decimal point, all of the digits in a number in scientific notation are meaningful and easier to read. Hope this helps!
Explanation:
What is the correct energy transformation in a hydropower dam?
well
(Sorry for the bad Quality it’s the Computer) PLEASE HELP MEEEE
Answer:
Gravitational to Mechanical to electrical
Explanation:
In a hydropower dam, the gravitational potential energy is converted to mechanical energy which in turn produces electrical energy.
The gravitational potential energy is due to the water overhead and the position of water inside the dam. The height and quantity of water determines the magnitude of the gravitational potential energy. Then, this energy is released when it falls on turbines and it drives them. As the turbine moves, mechanical energy is produced. The turbine is connected through a dynamo which produces a electric current by the turning action.
Based on the graph of US population and steel consumption, what could have led to the increase in steel consumption seen
on the graph?
Whenever the population has increased, steel consumption has increased as well
A larger population consumes greater amounts of fossil fuels like steel
When the population first started to increase, there was a need for much more construction
Steel consumption increased when people started to use computers.
Answer:
A. Whenever the population has increased, steel consumption has increased as well.
Explanation:
Based on the graph of US population and steel consumption, what could have led to the increase in steel consumption seen on the graph is that whenever the population has increased, steel consumption has increased as well.
A critical look at the graph, you will discover that the population and the steel consumption are moving upwards (i.e they are increasing). It's seen that as the population increases, steel consumption increases. This is true because as the population increases, people are building houses, more transportation systems that require steel are being manufactured, more household utensils that are steel products are being fabricated etc; therefore the consumption of steel increases.
. Consider the following half-reactions:
Ag+(aq) + e– → Ag(s) E = +0.80 V
Cu2+(aq) + 2 e– → Cu(s) E = +0.34 V
Pb2+(aq) + 2 e– → Pb(s) E = –0.13 V
Fe2+(aq) + 2 e– → Fe(s) E = –0.44 V
Al3+(aq) + 3 e– → Al(s) E = –1.66 V
Which of the above metals or metal ions will reduce Pb2+(aq)?
a. Ag+(aq) and Cu2+(aq)
b. Ag(s) and Cu(s)
c. Fe2+(aq) and Al3+(aq)
d. Fe(s) and Al(s)
e. Cu2+(aq) and Fe2+(aq)
d. Fe(s) and Al(s)
Further explanationIn the redox reaction, it is also known
Reducing agents are substances that experience oxidation
Oxidizing agents are substances that experience reduction
The metal activity series is expressed in voltaic series
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au
The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent
The more to the right, the metal is less reactive (harder to release electrons) and the stronger oxidizing agent
So that the metal located on the left can push the metal on the right in the redox reaction
The electrodes which are easier to reduce than hydrogen (H), have E cells = +
The electrodes which are easier to oxidize than hydrogen have a sign E cell = -
So the above metals or metal ions will reduce Pb²⁺ (aq) will be located to the left of the Pb in the voltaic series or which have a more negative E cell value (greater reduction power)
The metal : d. Fe(s) and Al(s)
Minerals with ____ element will react to a weak acid chemical (HCL) test
Answer:
calcium
Explanation:
What volume of 3.00 M HCl in liters is needed to react completely (with nothing left over) with 0.750 L of 0.100 M Na2CO3?
Answer:
0.0500L of 3.00M HCl are needed to react completely
Explanation:
Hydrochloric acid HCl reacts with sodium carbonate, Na2CO3, as follows:
2HCl + Na₂CO₃ → 2NaCl + H₂O + CO₂
Where 2 moles of HCl reacts per mole of Na₂CO₃
To find the volume of 3.00M HCl needed to react completely we need first to calculate the moles of Na₂CO₃ added and, with this chemical equation we can solve for moles of HCl as follows:
Moles Na₂CO₃:
0.750L * (0.100moles Na₂CO₃ / L) = 0.0750moles
Moles HCl:
0.0750moles Na₂CO₃ * (2 moles HCl / 1 mole of Na₂CO₃) = 0.150 moles of HCl
Volume of 3.00M HCl:
0.150 moles of HCl * (1L / 3.00moles) =
0.0500L of 3.00M HCl are needed to react completelyTrue or False: In general, the farther a location is from the equator, the cooler the climate.
Answer: True
Explanation: The farther away from the center or heat.
Answer:
Yes
Explanation:
The equator is the imaginary belt around the earth and it is created and named because the sun mostly shines on that part/line making heat which causes it to be hot.
Determine what kind of diet this animal has by examining its teeth.
Carnivore
Omnivore
Herbivore
Vegan
Answer:
That animal is a Carnivore.
Explanation:
The skull is that of a Panther which is a carnivore. Hope this helps
In which unit is the wavelength of an electromagnetic wave commonly measured?
A. J
B. nm
C. s-1
D. kg
Answer:
nm
Explanation:
trust me:)
PLEASE HELP!!
Which of the following correctly shows the net ionic equation for the reaction between iron (iii) sulfate and potassium hydroxide?
DUE IN 3 MINS!
The net ionic equation for the reaction between iron (iii) sulfate and potassium hydroxide is
Fe³⁺(aq) + 3OH¯(aq) —> Fe(OH)₃(s) (Option B)
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write the net ionic equationIn solution
Fe₂(SO₄)₃ (aq) --> 2Fe³⁺(aq) + 3SO₄²⁻(aq)
KOH (aq) --> K⁺(aq) + OH¯(aq)
The reaction proceeds as follow
Fe₂(SO₄)₃ (aq) + KOH (aq) —>
Fe³⁺(aq) + SO₄²⁻(aq) + K⁺(aq) + OH¯(aq) —> Fe(OH)₃(s) + SO₄²⁻(aq) + K⁺(aq)
Cancel out the spectator ions (i.e SO₄²⁻ + K⁺) and balance to obtain the net ionic equation
Fe³⁺(aq) + 3OH¯(aq) —> Fe(OH)₃(s)
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A piece of magnesium is in the shape of a cylinder with a height of 6.62 cm and a diameter of 2.34 cm. If the magnesium sample has a mass of 17.1 g, what is the density of the sample? (formula for volume of a cylinder: volume = r2h)
Answer:
0.600 g/cm³
Explanation:
Step 1: Given data
Height of the cylinder (h): 6.62 cmDiameter of the cylinder (d): 2.34 cmMass of the cylinder (m): 17.1 gStep 2: Calculate the volume of the cylinder
First, we have to determine the radius, which is half of the diameter.
r = d/2 = 2.34 cm/2 = 1.17 cm
Then, we use the formula for the volume of the cylinder.
V= π × r² × h
V= π × (1.17 cm)² × 6.62 cm
V = 28.5 cm³
Step 3: Calculate the density (ρ) of the sample
The density is equal to the mass divided by the volume.
ρ = m/V
ρ = 17.1 g/28.5 cm³
ρ = 0.600 g/cm³
What is crystallization
Explanation: Crystallization or crystallization is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal.
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37. Joshua wants to create something to put between a hot pot and a table, so he doesn't burn the table. He
knows he needs to choose a material that does not conduct heat well. Which material would be the best for
him to choose?
A Wood
B. Aluminum
C. Copper
D. Glass
Answer:
A.wood
Explanation:
It is a poor conductor of heat
If a cell has waste it needs to store, it will store it:
Answer:
The vacuole is the storage area of the cell. Most cells have one large vacuole. Vacuoles store food and other materials needed by the cell. They can also store waste products.
Explanation:
Which property of an ice cube will stay the same after the ice cube is melted?
A. Shape
B. Physical state
C. Mass
D. Texture
Answer:
C. Mass
Explanation:
After food is consumed, chemical nutrients are absorbed into the blood. The blood then carries these nutrients to the body's cells where the nutrients enter mitochondria. Which reaction must occur next for the cell to carry on other activities?\
Answer:c. oxygen,light,and glucose combine to produce high energy molecules
Explanation:
i need the answer for this
Answer:
need points
Explanation:
Aqueous solutions of lithium hydroxide (LiOH) and acetic acid (HC2H3O2) will react to yield lithium acetate and water. In the balanced equation for this reaction, what is the lowest possible whole number coefficient for water?
Answer: The lowest possible whole number coefficient for water is 1.
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical reation for aqueous solutions of lithium hydroxide and acetic acid react to yield lithium acetate and water is:
[tex] LiOH(aq)+CH_3COOH(aq)\rightarrow CH_3COOLi(aq)+H_2O(l)[/tex]
Thus the lowest possible whole number coefficient for water is 1.
In the balanced equation for given reaction, the lowest possible whole number coefficient for water is one.
What is the stoichiometry?Stoichiometry of any reaction will tells about the relative amount of species presents before and after the chemical reaction.
Reaction between the lithium hydroxide and acetic acid is a neutralization reaction, as here lithium hydroxide is a base and acetic acid is a acid as a result of which it produces water molecule and lithium salt of acetate. And balanced equation for this will be represented as:
LiOH(aq) + CH₃COOH(aq) CH₃COOLi(aq) + H₂O(l)
In the above equation all entities are present in equal amounts on both the sides and from the stoichiometry of the reaction it is clear that coefficient of water is 1.
Hence, 1 is the whole number coefficient for water.
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Mg + P4 → Mg3P2
Assuming an unlimited amount of phosphorous (P4), how many grams of Mg are needed in order to
produce 1200.00 grams of Mg3P2?
Answer:
648.7g of Mg must be added
Explanation:
Based on the reaction:
3Mg + 1/2P4 → Mg3P2
3 moles of Mg produce 1 mole of Mg3P2
To solve this problem we neeed to find the moles of Mg3P2 in 1200g. With these moles and the chemical reaction we can finf moles of Mg and its mass:
Moles Mg3P2 -Molar mass: 134.88g/mol-:
1200.0g Mg3P2 * (1mol / 134.88g) = 8.897 moles of Mg3P2
Moles Mg:
8.897 moles of Mg3P2 * (3mol Mg / 1mol Mg3P2) = 26.69 moles of Mg
Mass Mg -Molar mass: 24.305g/mol-:
26.69 moles of Mg * (24.305g / 1mol) =
648.7g of Mg must be addedThe air in a syringe has volume 25.0 mL
when the pressure is 4.38 atm. What will be
its volume when the pressure is 0.65 atm?
Answer:
168.46 mLExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{25 \times 4.38}{0.65} = \frac{109.5}{0.65} \\ = 168.46153...[/tex]
We have the final answer as
168.46 mLHope this helps you
Please rank the following atoms from smallest to largest: Ge, P, O
The following reaction occurs in a car’s catalytic converter.
2 upper N upper O (g) plus 2 upper C upper O (g) right arrow upper N subscript 2 (g) plus 2 upper C upper O subscript 2 (g).
Which answer best describes the reducing and oxidizing processes in this reaction?
NO and CO are both reducing agents.
NO and CO are both oxidizing agents.
The oxidation state of nitrogen in NO changes from +2 to 0, and the oxidation state of carbon in CO changes from +2 to +4 as the reaction proceeds.
The oxidation state of nitrogen in NO changes from 0 to +2, and the oxidation state of carbon in CO changes from +4 to +2 as the reaction proceeds.
Answer:
The oxidation state of nitrogen in NO changes from +2 to 0, and the oxidation state of carbon in CO changes from +2 to +4 as the reaction proceeds.
Explanation:
In the catalytic converter, the oxidation number of nitrogen in NO changes from +2 to 0, and of carbon in CO changes from +2 to +4 as the reaction proceeds. Thus, option C is correct.
What is a catalytic converter?The catalytic converter is a device used in vehicle exhaust to reduce the emission of toxic gas. The reaction in the device occurs to convert the nitric oxide into oxygen and nitrogen.
The redox reaction is given as,
2NO(g) + 2CO(g) → N₂(g) + 2CO₂(g)
In the reduction half of the reaction, the electrons are lost (addition of oxygen) like in carbon monoxide the oxygen is added that changes the number from +2 to +4. CO is a reducing agent that oxidized the carbon atom.
In the reduction half of the reaction, the oxygen is removed (electrons are added) and is shown by NO where the oxygen was lost to form N₂ with oxidation +2 to 0.
Therefore, option C. NO is a reducing agent that reduced nitrogen in the reaction.
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If a person tells you she is 6 feet tall, is she basing that measurement on customary units or metric units?
customary
metric
Answer:
Customary
Explanation:
Answer:
Customary
Explanation:
why is more dew formed on a grass and not on polished metal surface
Answer
Incidentally, they all form dew but because grass is closer to the soil, which maintains heat longer than the air where tree leaves are found, you will find more condensation in that region. Also, higher up the wind and sun will allow faster evaporation which makes the dew less noticable on tree leaves.
Explanation:
Preferred objects of dew formation are thus poor conducting or well isolated from the ground, and non-metallic, while shiny metal coated surfaces are poor infrared radiators. ... If the wet soil beneath is the major source of vapor, however (this type of dew formation is called distillation), wind always seems adverse.
Which of the following does not represent an aspect of an environmentally
sustainable society?
Answer:A = $90
B = $390
Explanation:
The aspect of the environmentally sustainable society has not been soil erosion.
An environmentally sustainable society has been the one that has been able to meet the current and future needs of the generation. The plantation of trees, reducing the greenhouse effect, and the method for the generation of a sustainable environment has been the characteristic of a sustainable society.
The soil erosion results in damage to the soil with the flow of the upper layer of soil from the water flow. The soil erosion will be resultant in damage to the environmentally sustainable society.
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what is the momentum of a baseball with a mass of 2kg being thrown at a velocity of 85m/s forwards the hitter?
Answer:
170 kg m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 2 × 85
We have the final answer as
170 kg m/sHope this helps you
How do fungi create energy?
A Fungi absorb oxygen to create chemical energy.
B Fungi absorb sunlight to produce chemical energy.
C Fungi absorb food from dead decaying organic matter to change into energy.
D Fungi absorb carbon dioxide gas to make chemical energy.
Answer: C.
Explanation:
NEED HELP ASAP!!! I just need to know the order
A student made the Lewis dot diagram of a compound as shown.
What is the error in the Lewis dot diagram?
A. The Ca atom should transfer only one electron to Ci because the formula is CaCi.
B. The number of dots around Ca should be one because Ca has to transfer only one electron to CI.
C. The Ca atom should transfer only one electron to CI, and the second electron should be transferred to another CI atom.
D. The CI atom should transfer two electrons to Ca because it has more electrons than Ca, so formula becomes CaCI*2
Answer:The Cl atom should transfer two electrons to Ca because it has more electrons
than Ca, so the formula becomes CaCl2.
Explanation: i took the quiz
Calcium forms ionic compound with two chlorine atoms as CaCl₂. Hence, Ca atom should transfer only one electron to one chlorine and the second electron is given to second Cl. Thus, option C is correct.
What is ionic bond?Ionic bond is formed between a metal and non metal by losing electron from the metal. The non metal should be an electronegative atom to accept that electron and forms a negative charge.
While the metal forms a partial positive charge. This charge separation make them attractive each other and make it ionic.
Ca is a second group element have two valence electrons. Ca forms compounds with halogens by donating its two electrons each to two halogen atoms and make a dihalide.
Cl have 7 electrons and tends to accept one electron from the metal to complete its octet. Thus one chlorine need only one electron from Ca. The second electron is then transferred to a second chlorine atom.
Therefore, the CaCl₂ compound is formed by transferring two electrons from calcium into two chlorine atom. Hence, option C ic correct.
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how many moles of atoms of each element in one mole (NH4)2CO3
Answer:
Chemists generally use the mole as the unit for the number of atoms or molecules of a material. One mole (abbreviated mol) is equal to 6.022×1023 molecular entities (Avogadro's number), and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole).\
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Explanation:
1 mole of (NH₄)₂CO₃ has:
2 moles of N atoms.8 moles of H atoms1 mole of C atoms.3 moles of O atoms.Let's consider the chemical formula of ammonium carbonate: (NH₄)₂CO₃.
The subscripts inform us of the number of moles of atoms in 1 mole of molecules.
Nitrogen has 2 subscripts: "1" (which is not written) and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.
[tex]N: 1 \times 2 = 2[/tex]
Hydrogen has 2 subscripts: "4" and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.
[tex]H: 4 \times 2 = 8[/tex]
The subscript for carbon is "1".
The subscript for oxygen is "3".
1 mole of (NH₄)₂CO₃ has:
2 moles of N atoms.8 moles of H atoms1 mole of C atoms.3 moles of O atoms.Learn more: https://brainly.com/question/375587
Which element has the same number of electrons in the outermost energy level at Lithium?
Answer:
Hydrogen, lithium, sodium, and potassium all have 1 valence electron ( an electron in the outermost energy level is a valence electron).