Answer:
According to mass and volume, block density is 2 g/ml
Explanation:
Density is a measure, usually used in physics and chemistry, that relates the mass and volume of a solid or compound.
In general terms, the density is directly proportional to the mass, and inversely proportional to the volume, so increasing the mass will also increase the density.
The formula used to calculate the density is
ρ = [tex]\frac{m}{V}[/tex]
Therefore, according to the mass and density of the block
ρ = [tex]\frac{12}{6}[/tex] = 2g/ml
Being the density of the block equal to 2 g/ml.
The other options are not possible, because the values given do not correspond to the result of the equation.
8. A fossil plant that helps support the theory of continental drift is ____.
a. Mesosaurus
b. Glossopteris
c. Glomar
d. Pangaea
Answer:
b.
Explanation:
Describe the structure of an Atom (HELP!)
Answer:
The answer is A.
Explanation:
Neutrons and protons are located in the dense middle of the atom called the nucleus, and electrons are located on the electron cloud located outside of the nucleus.
Which of these characteristics differentiate electrons from protons and neutrons
Calculate the wavelengths (in Å) for the first six Balmer lines (Ha, Hb, Hg, Hd, He, and Hz)
Explanation:
Transition of n 3→2 6→2
Name -H-α / Ba-α- H-δ- / Ba-δ
Wavelength (nm, air) -656.279 -410.1734
Energy difference (eV)- 1.89 -3.03
Color- Red -Violet
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The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?
O 6
O 12
O 18
O 24
The number of electrons in the atom in its neutral state will be equal to 12. Therefore, option (2) is correct.
What is a neutral atom?A neutral atom can be defined as one in which the number of the positive charge will be equal to the number of the negative charge. Therefore, the overall electrical charge on such an atom is zero and that type of atom is called a neutral atom.
For a neutral atom, commonly say that the number of electrons is equal to the number of protons. All chemical elements present in the modern periodic table are neutral.
Given, the electrical charge of the nucleus of an atom is equal to + 12. It means the given atom has 12 protons. As the number of protons and electrons in the neutral atom is the same, therefore the number of electrons in the given atom is equal to 12.
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You eat a large meal and then hike up a hill. What kind of energy transformation is your body performing?
Group of answer choices
Chemical energy to kinetic energy and gravitational potential energy
Chemical energy to kinetic energy and nuclear energy
Kinetic energy to chemical energy and light energy
Gravitational potential energy to sound energy and nuclear energy
Answer:
Chemical energy to kinetic energy and gravitational potential energy
Explanation:
The kinetic and potential energy is collectively known as the mechanical energy. When you eat a large meal and then hike up a hill the energy change taking place is Chemical energy to kinetic energy and gravitational potential energy. The correct option is A.
What is energy?The physical quantity which is transferred from one object to another to perform work or to heat the object is defined as the energy. The SI unit of energy is Joule and it is a derived unit.
The energy possessed by a moving body due to its motion is defined as the kinetic energy. The energy stored by an object due to its position is called the potential energy.
When we eat food, our body uses the chemical energy of food and during climbing, the body gets moved so the kinetic energy gets converted into gravitational potential energy.
Thus the correct option is A.
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What is neutron?
What is Atom?
Answer:
A neutron is a subatomic particle with no charge and is found in the nucleus of an atom.
An atom is the smallest particle of an element that retains its identity in a chemical reaction.
Explanation:
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Answer:
See below.
Explanation:
Neutron is a subatomic particle which has a neutral charge and forms the nucleus of the atom.
Atom is the smallest unit of matter which composes solids, liquids, gases, and plasma.
Calcium and water are the reactants in this chemical reaction. The products are calcium hydroxide and hydrogen gas. Which statement correctly describes the total mass of the products when the reaction is complete?
Explanation:
Using the Law of Conservation of mass,the mass of the reactants should be equal to the mass of the products after the reaction.
What type of energy is transferred during heating?
A. Thermal
B. Temperate
C. Convective
D. Conductive
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Answer:
A.) Thermal
Explanation:
I got it correct on founders edtell
the ion with a 3+ charge, 28 electrons, and a mass number of 71
How many atoms are in 3.5 L of Neon at STP? Show your work
Answer:
0.1734
this is the answer to the question
How many hydrogen (H) atoms are there in this chemical formula? 3C5HgNNaO4
There don't seem to be any H atoms in that formula. All I see is Hg, which is mercury.
What is an atomic element
Answer:
An atomic element is an element which exists independently as atoms and can still react with other elements forming a compound
In the diagram below, west is to the left, east is to the right, and the observer is looking toward the north. What is the direction of the wind?
A. NE
B. NW
C. SE
D. SW
. In an experiment, 1.90 g of NH3 reacts with 4.96 g of O2. 4NH3(g) + 5O2(g) ⟶ 4NO(g) + 6H2O(g) (i) Which is a limiting reactant? Show your working. (ii) How many grams of excess reactant remain? Show your working. (iii) How many grams of NO is formed? Show your working
1. The limiting reactant in the reaction is NH₃
2. The mass of the excess reactant remaining is 0.49 g
3. The mass of NO produced from the reaction is 3.35 g
Balanced equation4NH₃ + 5O₂ —> 4NO + 6H₂O
Molar mass of NH₃ = 14 + (3×1) = 17 g/mol
Mass of NH₃ from the balanced equation = 4 × 17 = 68 g
Molar mass of O₂ = 16 × 2 = 32 g/mol
Mass of O₂ from the balanced = 5 × 32 = 160 g
Molar mass of NO = 14 + 16 = 30 g/mol
Mass of NO from the balanced equation = 4 × 30 = 120 g
SUMMARY
From the balanced equation above,
68 g of NH₃ reacted with 160 g of O₂ to produce 120 g of NO
1. How to determine the limiting reactantFrom the balanced equation above,
68 g of NH₃ reacted with 160 g of O₂
Therefore,
1.90 g of NH₃ will react with = (1.90 × 160) / 68 = 4.47 g of O₂
From the calculation made above, we can see that only 4.47 g out of 4.96 g of O₂ given is needed to react completely with 1.90 g of NH₃.
Therefore, NH₃ is the limiting reactant.
2. How to determine the mass of the excess reactant remaining Mass of excess reactant (O₂) given = 4.96 gMass of excess reactant (O₂) that reacted = 4.47 gMass of excess reactant (O₂) remaining =?Mass of excess reactant (O₂) remaining = 4.96 – 4.47
Mass of excess reactant (O₂) remaining = 0.49 g
3. How to determine the mass of NO producedIn this case, the limiting reactant (NH₃) will be used.
From the balanced equation above,
68 g of NH₃ reacted to produce 120 g of NO
Therefore,
1.90 g of NH₃ will react to produce = (1.90 × 120) / 68 = 3.35 g of NO.
Thus, 3.35 g of NO were obtained from the reaction.
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what are the mitigating measures for flood,earthquake and fire?
Answer:Securing heavy objects to walls and floors, such as shelves, bookcases, cabinets, and water heaters.
Explanation:
What information does an acid or base equilibrium constant give?
The value of the equilibrium constant shows the relative amounts or concentrations of the reactants and products.
When fluids are subjected to increases in pressure they tend to do this.
A.) evaporate
B.) contract
C.) expand
D.) solidify
Answer:
D.) solidify
Explanation:
Gold can undergo transmutation. Which equation could correctly describe this radioactive decay?
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper Re + Superscript 4 Subscript 2 Baseline Upper H e
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 4 Subscript 2 Baseline Upper H e
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript negative 1 Baseline e
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript positive 1 Baseline e
um B is the answer on the unit test
Answer:
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript positive 1 Baseline e
Answer: the answer is B
Explanation:
just took the assignment
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H2O + C16H17NaO14 = CO2 + 8H20 + C2H3NaO3 Since there are 19 Hydrogen on the Reactants side, due to Law of Conservation of Mass, there must be ___Hydrogen on the Product side.
A. 0
B. 2
C. 8
D. 19
Answer: 8
Explanation:
find the valu of
|2x-1|=x+1 is
Explanation:
|2x-1|=x+1
√(2x-1)²= x+1
(2x+1)²=(x+1)²
4x²-4x+1=x²+2x+1
3x²-6x=0
x²-2x=0
x(x-2)=0
x=0 or x=2
Which action will decrease the gravitational force between two objects?
A. Adding mass to one of the objects
B. Increasing the charge on one of the objects
C. Reducing the masses of the objects
D. Moving the objects closer together
Answer: C
Explanation:
The force of gravity is proportional to the amount of mass in the system, and is inversely proportional to the separation distance between the two masses.
Adding mass to one of the objects would increase the gravitational field it produces, which in return increases the force of gravity.
Increasing the charge of one of the objects would technically add mass to the system, but it can be considered negligible. The adding of charge would cause an attraction between the two objects, but that is not the gravitational force. It is the Coulomb force.
Reducing the mass of one of the objects would decrease the gravitational field it produces, which would cause the force of gravity to decrease. This is the answer.
Moving the objects closer would cause the denominator of the force equation to decrease. A smaller denominator would cause the equality to increase, aka the gravitational force.
[tex]F=GMm/r^2[/tex]
Think of a substance that does not dissolve in water. Explain what happens when this substance is added to water.
An example would be oil. Oil is considered to be hydrophobic (which translates to "fear of water" so it is repelled by water). It floats on the top of water, which is why oil spills result in black blobs that float on the surface of the ocean rather than mix underneath the surface.
Why critical thinking is important for chemists?
Answer:
"Critical thinking is the analysis of available facts, evidence, observations, and arguments to form a judgment. The subject is complex; several different definitions exist, which generally include the rational, skeptical, and unbiased analysis or evaluation of factual evidence. Critical thinking is self-directed, self-disciplined, self-monitored, and self-corrective thinking. It presupposes assent to rigorous standards of excellence and mindful command of their use. It entails effective communication and problem-solving abilities as well as a commitment to overcome native egocentrism and sociocentrism." - Searched it up on Wiki, so at least I stated this-.
I hope this helps..?
Answer:
Critical thinking in the area of chemistry requires students to not just think about the concepts and principles of but also how they can be applied to other areas. Critical thinking creates an area of overlapping or related information to the nature of a certain function.
Explanation:
its simple plus hope this helps
What is an orbital? (10 points)
Which of the following is true of a compound but not a mixture? (1) A compound contains more than one element.
(2) All the nuclei in a compound contain the same number of protons.
(3) A compound may be heterogeneous.
(4) The composition of a compound does not vary
The composition of a compound does not vary because it is made up of fix ratio by mass.
What is compound?A compound is a chemical substance that is composed of more than one element that held together by chemical bonds and produces fix ratio by mass so we can conclude that the composition of a compound does not vary because it is made up of fix ratio by mass.
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A photon has a wavelength of 220 nm. How much energy does the
photon have?
Answer:
The energy of a photon with a wavelength of 350 nm is 5.7×10−19 J .12/05/2
Explanation:
1.00 g of a compound is combusted in oxygen and found to give 3.14g of CO2 and 1.29 g of H2O. From these data we can tell thatA. the compound contains C, H, and some other element of unknownidentity, so we can’t calculate the empirical formula.B. the compound contains only C and H and has the empirical formulaof C6H.C. the compound contains C, H, and O and has the empirical formulaof CH3O.D. the compound contains only C and H and has the empirical formulaof CH2.E. None of the above is a true statement
Answer:
the compound contains C, H, and some other element of unknownidentity, so we can’t calculate the empirical formula
Explanation:
Mass of CO2 obtained = 3.14 g
Hence number of moles of CO2 = 3.14g/44.0 g = 0.0714 mol
The mass of the carbon in the sample = 0.0714 mol × 12.0g/mol = 0.857 g
Mass of H2O obtained = 1.29 g
Hence number of moles of H2O = 1.29g/18.0 g = 0.0717 mol
The mass of the carbon in the sample = 0.0717 mol × 1g/mol = 0.0717 g
% by mass of carbon = 0.857/1 ×100 = 85.7 %
% by mass of hydrogen = 0.0717/1 × 100 = 7.17%
Mass of carbon and hydrogen = 85.7 + 7.17 = 92.87 %
Hence, there must be an unidentified element that accounts for (100 - 92.87) = 7.13% of the compound.
What is the missing force?
Answer:
The missing force is the 17 newton
Explanation:
1.is the light from the christmas tree natural or artificial?