Answer:
D
Explanation:
Answer:
D) Bacterium
Explanation:
How did mossely esablish a more accurate periodic table
Explanation:
arranged by their number of protons rather than their atomic mass
Please I'm begging for help. I'll give you ALL MY POINTS. JUST PLEASE HELP.
Worksheet: Balancing Equations
Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical reaction. ________________ are the starting substances in the reaction while ________________ are the new substances that are formed. The large numbers in front of some of the formulas are called ________________. These numbers are used to ________________ the equation because chemical reactions must obey the Law of ________________ of Matter. The number of atoms of each element on both sides of the equation must be ________________ because matter
cannot be ________________ or ________________. When balancing equations, the only numbers that can be changed are ________________; remember that ________________ must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3
2. C3H8 + O2 CO2 + H2O
3. P4 + O2 P2O3
4. KNO3 KNO2 + O2
5. O2 + CS2 CO2 + SO2
6. KClO3 KCl + O2
7. N2 + H2 NH3
8. NaF + Br2 NaBr + F2
9. Al + HCl H +AlCl3
10. WO3 + H2 W + H2O
Answer:
Explanation:
A Chemical Equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while Products are the new substances that are formed. The large numbers in front of some of the formulas are called Coefficients. These numbers are used to Balance the equation because chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be Equal because matter cannot be Created or Destroyed. When balancing equations, the only numbers that can be changed are Coefficients; remember that Subscripts must never be changed in order to balance an equation.
Q1) 4Al + 3O2 ---> 2Al2O3
Q2) C3H8 + 5O2 -----> 3CO2 + 4H20
Q3) P4 + 3O2 -----> 2P2O3
Q4) 2KNO3 -----> 2KNO2 + O2
Q5) 3O2 + CS2 ------> CO2 + 2SO2
Try the rest out and tell me did you understand it?
two students noted that the acceleration of a car was =40 k/m squared . the fiesta student , "that can't be right . you can't have a negativo acceleration ."second student said , "that can't be right , you can't have seconds squared .
what would you say to each student to help them More better understand how acceleration Is described
PLEASE ANSWER ASAP,FOR MY SCIENCE TEST
Answer:
First one: Yes, It can be negative.
Explanation:
First one: The reason you can have negative acceleration is that acceleration can slow down, or decelerate, causing the negative acceleration.
A buffer solution is prepared by adding NaC2H202
to a solution of HC2H2O2 (acetic acid).
HC2H2O2(aq) = H+ (aq) + CH3O2 (aq)
What happens if HCl is added?
Shift to reactants(left)
Further explanationA buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solutions consist of weak acids and their salts.
A buffer solution of NaC2H202 and HC2H2O2 (acetic acid) is included in the acid buffer
So :
a slight addition of acid (H⁺) will be balanced by the conjugate base
the addition of a small base (OH⁻) will be balanced by the weak acid
With the addition of acid (H +), the equilibrium will shift to the left, in the formation of CH3COOH. The added acid will be neutralized by the conjugate base component (CH3COO−).
How does the vacuole help the cell survive? (function)
Answer:
it stores water for the cell
What is a constraint on the solar oven design?
A. The solar oven must heat up quickly
B. The design should look like the provided diagram
C. The solar work in any kind of weather
D. The materials may cost no more than sixty dollars
Answer:
D
Explanation:
I may need a photo but D seemed the most logical
15. Which of the following would be comprised of atoms?
O emotions
Olight
O paper
O sound
Answer:
Paper
Explanation:
This is because out of all of the above it is the only physical substance
How many atoms of Carbon are in 4 C3H5012?(10 points)
Answer:
In carbon there are 12 atoms.
Explanation:
You need to multiply the coefficient, in this case the coefficient is a 4 to Carbon's (C) Subscript which is 3, to find out how many atoms it has. (4)(3)=12
14.What is the main difference between a generator and an electric motor? A generator produces electricity and an electric motor consumes electricity. A generator uses a permanent magnet and an electric motor uses an electromagnet. A generator produces a magnetic field and an electric motor produces an electric field. A generator uses a rotating magnetic field and an electric motor uses a non-moving magnetic field. 15.A science lab has copper wire coated with rubber tubing, a plastic vial, and a pair of cotton gloves. Which of these materials is not an electrical insulator? A.Copper wire B.Cotton gloves C.Plastic D.Rubber tubing
Answer:
14) A generator uses a rotating magnetic field and an electric motor uses a non-moving magnetic field.
15) Copper wire
Explanation:
The electric motor is device that that converts electrical energy into mechanical energy. The armature and coil are positioned between two powerful magnets with a split ring commutator and carbon brushes. A cell is connected to the carbon brushes.
If the armature of the electric motor is made to rotate, it will act as a generator delivering current at the terminals.
An insulator is a material that does not allow electric current to pass through it. Copper allows the passage of electric current hence it is not an insulator.
Explain your observations on what organisms need to grow. Explain how human activity can impact an organism's ability to obtain the resources it needs to survive. State your opinion about how human activity can be changed to have less impact on the lives of other organisms.
Answer:
The human being sometimes exploits the resources that other living organisms need to survive. This is how competition for the environment increases and many species on this planet are at risk of extinction.
Explanation:
An example of this is how humans exploit mambu canes for commercial products, such as sweets and even toys, thus generating that the panda bear species does not have a food resource to survive.
How many molecules are in 100 g of C6H120,?*
Answer:
3.37 × 10²³ molecules
Explanation:
Given data:
Mass of C₆H₁₂O₆ = 100 g
Number of molecules = ?
Solution:
Number of moles of C₆H₁₂O₆:
Number of moles = mass/molar mass
Number of moles = 100 g/ 180.16 g/mol
Number of moles = 0.56 mol
Number of molecules:
1 mole contain 6.022 × 10²³ molecules
0.56 mol × 6.022 × 10²³ molecules /1 mol
3.37 × 10²³ molecules
How does blood flow from a person's leg back to the person's heart?
A Gravity pushes the blood upward.
B Lungs pull the blood upward.
C Contracting leg muscles push the blood upward.
D Contracting heart muscles pull the blood upward.
PLEASE HELP ill be asking more questions for whoever wants to help THANK YOU:)
A.In a chemical reactions, substances after the arrow are called ________.
C2H4 + O2 → CO2 + H2O
1 products
2 reactants
3 no answer text provided
4 chemicals
B.In this reaction: sodium + water -> sodium hydroxide + hydrogen gas
which substances are the reactants?
1 hydrogen gas
2 sodium hydroxide + hydrogen gas
3 sodium + water
4 sodium hydroxide
C. This is an example of what type of reaction?
Mg + Fe2O3 → Fe + 3 MgO
1 decomposition
2 double replacement
3 single replacement
4 synthesis
5 combustion
D. This is an example of what type of reaction?
Ca(OH)2 + Al2(SO4)3 → CaSO4 + Al(OH)3
1 synthesis
2 decomposition
3 double replacement
4 combustion
5 single replacement
E. This is an example of what type of reaction? PbSO4->PbSO3 + O2
1 single replacement
2 combustion
3 double replacement
4 synthesis
5 decomposition
F. This is an example of what type of reaction?
C2H4 + O2 → CO2 + H2O
1 single replacement
2 double replacement
3 synthesis
4 decomposition
5 combustion
Each reaction has its own characteristics which can be determined from the reactants and products
Further explanationEvery chemical reaction involves a compound consisting of reactants and products
Reactants are compounds that react and form new compounds called products
There are several forms of reactions that can occur, including single replacement, double replacement, synthesis, decomposition, etc.
A. substances after the arrow are called 1 products
The product compounds in this reaction are: CO₂ + H₂O
B. which substances are the reactants : sodium + water
and The product compounds : sodium hydroxide + hydrogen gas
Reaction
2Na(s) + 2H₂O → 2NaOH(aq) + H₂(g)
C. Mg + Fe₂O₃ → Fe + 3 MgO is an example of single replacement :one element replaces the other elements of a compound to produce new elements and compounds
D. Ca(OH)₂ + Al₂(SO₄)₃ → CaSO₄ + Al(OH)₃ is an example of double replacement : there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
E. PbSO₄->PbSO₃ + O₂ is an example of decomposition : One compound breaks down into 2 components
F.C₂H₄ + O₂ → CO₂ + H₂O is an example of combustion : when Oxygen combines with hydrocarbon
Todds apartment building has a statue hanging from the balcony. The statue
breaks off and falls to the sidewalk below. What energy conversion takes
place during the far?
Energy conversion takes place during the far Gravitational Potential Energy to Kinetic Energy.
What is kinetic Energy?Kinetic energy = total energy - potential energy.
The total energy of a system is the addition of kinetic and potential energy of the system. Kinetic energy can be regarded as a form of energy posses by an object when it's in motion.
Total energy = kinetic energy + potential energy.
Hence, in this question when the statue breaks off and falls to the sidewalk below gravitational potential energy is converted to kinetic Energy.
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Answer:
Gravitational potential energy to kinetic energy
Explanation:
How does heat transfer work?
Answer:
Conduction is one of the three main ways that heat energy moves from place to place. The other two ways heat moves around are radiation and convection. Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules
Explanation:
4 grams of hydrogen and 32 grams of oxygen will combine to form:
A: 36 grams
B: 28 grams of hydroxide
C: 32 grams of Oxygen
D: 36 grams of deuterium
Based on the mole ratio of the reaction, 4 grams of hydrogen and 32 grams of oxygen will combine to form 36 grams of water; option A
What is the mole ratio of the reaction between hydrogen and oxygen?The mole ratio of a reaction is the ratio in which the moles of reactants combine to form products.
The mole ratio of a reaction is obtained from the balanced equation of the reaction.
The balanced equation of the reaction between hydrogen and oxygen is given below:
2 H₂ + O₂ ---> 2 H₂OBased on the equation of the reaction, 2 moles of hydrogen combines with 1 mole of oxygen to form 2 moles of water.
4 grams of hydrogen = 2 moles of hydrogen
32 grams of oxygen = 1 mole of water
Mass of 2 moles of water = 2 * 18 g
Mass of 2 moles of water = 36 g of water.
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The exchange of gases in lungs take place in alveoli. True or false
Answer:
True
Explanation:
At the end of each bronchiole is a cluster of little air sacs called alveoli. Alveoli are wrapped in tiny blood vessels called capillaries. The air you breathe in fills these air sacs with oxygen-rich air. This is where the exchange of gases occurs.
Chromium has four naturally occurring isotopes. cr-50 (mass of 49.946 amu and 4.35% abundance); cr-52 (mass of 51.941 amu and 83.79% abundance); cr-53 (mass of 52.941 amu and 9.50% abundance); and cr-54 (mass of 53.939 amu and 2.36% adundance). calculate the average atomic mass of chromium to 3 decimal points. average atomic mass=(mass a)(%a) (mass b)(%b) (mass c)(%c) (mass d)(%d) 100
The average atomic mass of chromium to 3 decimal points is 52. 055 g. mol.
What is the average atomic mass?"The weighted average mass of the atoms in a naturally occurring sample of an element is the average atomic mass, also known as atomic weight."
Given the different isotopes of chromium.
The four isotopes of chromium are cr-50, cr-52, cr-53 cr-54.
The average atomic mass will be
Let us take the weighted average of your isotopes:
50 × 0.0434 + 52 × 0.8379 + 53 × 0.095 + 54 × 0.0237 = 52. 055 g.
Thus, the average atomic mass of chromium is 52. 055 g.
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Match each type of mass movement to its description.
the rapid downhill flow of a mixture of rock,
soil, and water
slump
mudflow
the slow downhill movement of rock and soil
creep
the rapid downhill movement of a mass of
rock, debris, or soil
landslide
a loosely connected mass of rock and soil
that moves a short distance
Answer: np
Explanation:
Correctly matched are :
landside - rapid movement of rock, debris, and soil. mudflow - mixture of rocks, soil, water. slump - loosely mass of rocks and soil.What is a landslide?A landslide is also called a land slip. It refers to several forms of mass wasting and may include a wide range of ground movements. They occur in a variety of environments characterize by gentle and steep slope gradients.
The mudflow is a mixture of rocks and soil along with water. While a creep is a slow downloads movement of rocks and soil.
Find out more information about the mass movement.
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A tub is filled to the brim with water.
If you were to completely submerge
your body in this tub, how much water
would overflow out of the tub?
The volume of water that would overflowed out of the tub is directly related to the volume of the object submerged on it. Thus it depends on the mass and density of the object.
What is Archimedes principle?The Greek mathematician and inventor Archimedes discovered the physical law of buoyancy, which states that any body completely or partially submerged in a fluid (gas or liquid) at rest is subject to an upward, or buoyant, force whose magnitude is equal to the weight of the fluid displaced by the body.
The volume of fluid that has been displaced is equal to the volume of an object that is completely submerged in the liquid or to the portion of the volume below the surface for an object that is only partially submerged.
The buoyant force's strength is equal to the weight of the fluid that has been dispersed. A body floating in a liquid or gas experiences an analogous buoyant force.
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How many moles are found in 6.63 x 10^23 ions of Ca ^+2
Answer:
a milllion moles
Explanation:
100cl 1kl which is greater
Answer: = 0.01
Explanation:1 centiliters = 0.01 liters using the online calculator for metric conversions.
Why does the reaction proceed more quickly when the surface area is increased?
The reaction proceed more quickly when the surface area is increased because the frequency of collision increases.
What is Collision theory?Collision theory states that for a chemical reaction to proceed, it should achieve these conditions-
Molecules/atoms must collideThe particles must collide in right orientationThe particles must collide with enough energyIncreasing the surface area increases the probability of effective collisions. It thus increases the probability of the three conditions being achieved and results into increase in the frequency of collision and thus increases the rate of reaction.
Therefore, the reaction proceed more quickly when the surface area is increased because the frequency of collision increases.
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The illustration above represents what concept?
A.) Natural selection
B.) Homologous structures
C.) Adaptation
D.) Variation
2.) A fossil that is characteristic of a particular span of geological time or a specific environment is called a(n):
A.) Index fossil
B.) Cast fossil
C.) Petrified fossil
D.) Mold fossil
3.) How is artificial selection different from natural selection? Select the best answer from the choices below.
A.) In artificial selection, animals. that are more likely to survive reproduce.
B.) In artificial selection, members of a species must complete to survive
C.) In natural selection, people impact. which traits are passed on
D.) In artificial selection, humans choose which organisms reproduce.
PLEASE HELP!!!
Answer:
3 Is D
Explanation:
15. Upon balancing the equation below, how many moles of sulfuric acid are needed to react completely with 6.4 moles of lithium hydroxide?
LIOH + H2SO4 -> Li2SO4 + H20 (2 points)
12.8 mol H2SO4
6.4 mol H2SO4
O 3.2 mol H2SO4
O 2.1 mol H2SO4
Moles of Sulfuric acid- H₂SO₄ needed to react completely : 3.2 moles
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction(balanced)
2LiOH + H₂SO₄ → Li₂SO₄ + 2H₂O
From the reaction equation above, the reaction coefficient shows the mole ratio of reagents and products
moles of Lithium hydroxide-LiOH = 6.4 moles
mol ratio of LiOH : H₂SO₄ = 2 : 1, so mol H₂SO₄ :
[tex]\tt moles~H_2SO_4=\dfrac{1}{2}\times 6.4=3.2[/tex]
the half reaction of an oxidation-reduction shows that iron gains electrons. what does this electron gain mean for iron?
a. it’s neutralized
b. it’s oxidized
c. it has dissolved
d. it’s reduced
e. it has precipitated
Answer:
d. it’s reduced
Explanation:
An oxidation-reduction reaction, commonly known as REDOX reaction is a type of reaction that involves the transfer of electrons from one atom to another characterized by a change in oxidation number. The atom that loses electrons is said to be OXIDIZED while the atom that gains electrons is said to be REDUCED.
Therefore, in this question describing the half reaction of an oxidation reduction to show that iron atom (Fe) gains electrons. This indicates that the IRON atom is being REDUCED because it's oxidation number will reduce after gaining electrons.
Help PLEASE!! Will mark brainly Calculate the total energy in 1.5 x 10^13 photons of gamma radiation having wavelength = 3.0 x 10^-12 m. Need to show ALL work.
Answer:
E = 0.994 J
Explanation:
Given that,
Total no of photons, [tex]n=1.5\times 10^{13}[/tex]
The wavelength of gamma radiation, [tex]\lambda=3\times 10^{-12}\ m[/tex]
We need to find the total energy in given no of photons. The formula for the energy of a photon is given by :
[tex]E=\dfrac{hc}{\lambda}[/tex]
For n photons,
[tex]E=\dfrac{nhc}{\lambda}\\\\E=\dfrac{1.5\times 10^{13}\times 6.63\times 10^{-34}\times 3\times 10^8}{3\times 10^{-12}}\\\\=0.994\ J[/tex]
So, the total energy is 0.994 J.
pls this is my second time asking these questions, i'm sorry, but i really need help!!! 1. what happens to atoms when there is a chemical reaction? 2. what are the rules that have to be followed for atoms? 3. what do these rules mean for chemical reactions? sorry, chemistry isn’t really my best subject lol
Answer:
the atoms of the original substances gain, lose and even share their very own electrons. write the symbols of the elements that form the compound. Write down the valency, and lastly go over valencies. This is all I got so far. I hope this helps
Explanation:
Why does the density of a substance stay constant even if the mass of the substance increases?
Answer:
If the mass stays constant the object's density decreases as the volume increases. ... Because the property of density is a constant for all variables, density can be used to identify the material an object is made of.
Explanation:
I've tried looking it up but I can't find an answer. Please help with this question.
Answer:
Hydrocarbons
Explanation:
Answer:
Monomers
Explanation: