2NaCl + MgO → Na₂O + MgCl₂ and 2H₂ + O2 →2H₂O the correct formulas that indicate only a physical change has taken place
In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition
2NaCl + MgO → Na₂O + MgCl₂ has change the color as well as appearance and in the 2H₂ + O2 →2H₂O has also change in the physical changes
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4. Compare the diagrams of the two substances shown below.
a. Use your understanding of structure to predict which substance is a gas at room temperature and which is a
at room temperature.
b. Explain your answer using your understanding of the relationship between structure and properties of
substances.
bond-
silicon atom
oxygen atom
Answer:
the anserw is 2
Explanation:
8.0 g of a monoatomic gas occupies 96.0 L at 380.9 mm Hg and 20.0 °C. What is the identity of the gas?
The monoatomic gas : He
Further explanationIn general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
P 380.9 mmHg = 0.5 atm
T 20 C+273 = 293 K
We can find molar mass of gas :
[tex]\tt M(molar~mass(M)=\dfrac{mRT}{PV}\\\\M=\dfrac{8~g\times 0.082\times 293~K}{0.5~atm\times 96~L}\\\\M=4~g/mol[/tex]
monatomic gas means a single element, usually a noble gas. The noble gas element with mass 4 is He
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If water is added to 100. mL of a 0.150 M NaOH solution until the final volume is 150. mL, what will the molarity of the diluted solution be?
Answer:
0.1 M molar NaaOH
Explanation:
M1V1= M2V2
M1 = 0.150M NaOH
V1=100 ml
V2=150 ml
M2=?
M2= M1V1/V2
M2= 0.150*100/150=0.1 M
what is 2 multiplied by 4
Answer:
8
Explanation:
Answer:
the answer is 8 :D
Explanation:
2x4 also known as 2+2+2+2 is equal to 8
ОА
H+ HH
O H+ H → He
Oc He+
TH
Не
ODH +
Η
>
Ao H+HH OH
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A 36.0 g sample of metal was heated from 0°C to 55.0°C. It absorbed 150 J of
energy as heat. What is the specific heat of this piece of metal?
Motino
abiD
A 36.0 g sample of metal was heated from 0°C to 55.0°C. It absorbed 150 J of energy as heat then the specific heat of this piece of metal is 0.0758 J/g.°C .
The term "specific heat" refers to the amount of energy needed to raise a substance's unit mass by one degree Celsius. This can be mathematically stated as:
q = m×c×ΔT,
where ,
q = the amount of heat
m = the mass of the substance
c = the respective substance's specific heat;
ΔT = the change in temperature.
So, if we want to determine the units for specific heat, we'll just isolate the term in the above formula to get
c = q / m × ΔT ( i )
Since heat is measured in Joules ( J ) , mass in grams ( g ) , and temperature in degree Celsius , we can determine that specific heat capacity from equation ( i ) by putting all the given data in this equation ,
c = 150 J / 36.0 g × 55.0 °C = 150 J / 1980 g.°C = 0.0758 J/g.°C
Therefore, specific heat is measured in Joules per g times degree Celsius.
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According to Periodic Law, elements arranged in order of increasing atomic number are placed together in groups having
Answer: same valence shell configuration and properties
Explanation:
A meterorite has velocity of 1544 m/s and a mass of 45 kg. Find its momentum
Answer:
69,480 kg.m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 45 × 1544
We have the final answer as
69,480 kg.m/sHope this helps you
Answer:
69,480 kg. m/s
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Convert 3.30 g of copper (II) hydroxide Cu(OH)2 to molecules.
Answer:
0.18× 10²³ molecules
Explanation:
Given data:
Mass of copper hydroxide = 3.30 g
Number of molecules = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 3.30 g/97.56 g/mol
Number of moles = 0.03 mol
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
0.03 mol × 6.022 × 10²³ molecules / 1mol
0.18× 10²³ molecules
1.
A sample of helium gas is heated from 20.0°C to 40.0°C. This heating
process causes the gas to exland to a volume of 585 mL. What was
the original volume of the helium gas?
Answer:
V₂ = 530.5 mL
Explanation:
Given data:
Initial temperature = 20.0°C
Final temperature = 40.0 °C
Final volume = 585 mL
Initial volume = ?
Solution:
Initial temperature = 20.0°C (20+273 = 293 K)
Final temperature = 40.0 °C (40+273 = 323 K)
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₁ = V₂T₁ /T₂
V₂ = 585 mL × 293 K / 323 K
V₂ = 171405 mL.K / 323 K
V₂ = 530.5 mL
Acetylene torches are used for welding, but the thermite reaction can be useful in situations in which acetylene torches are inappropriate, such as welding underwater. The thermite reaction is described by the equation below:
Upper F e subscript 2 upper O subscript 3 plus 2 upper A l right arrow upper A L subscript 2 upper O subscript 3 plus 2 upper F e. (see image)
A welder has 1.873 × 102 g Fe2O3 and 94.51 g Al in his welding kit. Which reactant will he run out of first?
How many grams of aluminum oxide are produced in the reaction?
Al is the limiting reactant and would run out quickly and 357 g of aluminum oxide is produced.
What is the limiting reactant?The limiting reactant is the reactant is the reactant that is present in the least amount in the system. This is the reactant that is going to run out most quickly. The limiting reactant would be the one that would determine the amount of product that is formed.
Now the reaction equation is shown in the image attached to the question above.
Number of moles of Fe2O3 = 1.873 × 10^2 g /160 g/mol = 1.17 moles
Number of Al = 94.51 g Al/27 g/mol = 3.5 moles
If 1 mole of Fe2O3 reacts with 2 moles of Al
1.17 moles of Fe2O3 reacts with 1.17 moles * 2 moles/ 1 mole
= 2.34 moles
Hence Al is the limiting reactant and would run out quickly.
Mass of aluminum oxide produced = 3.5 moles * 102 g/mol = 357 g
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Which of the following is a way that human modification of limiting factors causes unbalance in ecosystems.
Answer:
D. all of the above
Explanation:
edg 2021
A way that human modification of limiting factors causes unbalances in ecosystems. are habitat loss, pollution, and climate change. Option D. This is further explained below.
What is an ecosystem.?Generally, An ecosystem is a geographical region in which plants, animals, and other species, as well as weather and topography, coexist to produce a circle.
In conclusion, habitat loss, pollution, and climate change are all human modification of limiting factors causes unbalance in ecosystems.
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CQ
which of the following is a way that human modification of limiting factors causes unbalance in ecosystems? a. habitat loss b. pollution c. climate changes d. all of the above
What is the Mass percent of carbon in glucose, C6H12O6?
Answer:
the answer is 40% but, correct me if I'm wrong
Explanation:
Answer:
40%
Explanation:
Mass of carbon / total mass × 100
72/180× 100 = 40%
Fill in all the grey boxes including the green box. PLEASE HELP
Answer:
2Na + 2H2O ----> 2NaOH + H2
Explanation:
which of these characteristics of all animal cells ? check all that apply
they contain a nucleus .
they are eukaryotic.
they lack member-bond organelles.
they lack in nucleus.
they are prokaryotic.
they contain member-bond organelles.
Answer:
They contain member-bond organelles.Explanation:
I hope l helped you. Please follow me. ❤❤❤When is chemical energy released
Explanation:
Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place. Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.
Answer:
Breaking or making of chemical bonds involves energy, which may be either absorbed or evolved from a chemical system. Energy that can be released or absorbed because of a reaction between a set of chemical substances is equal to the difference between the energy content of the products and the reactants, if the initial and final temperatures are the same.
Explanation:
An element with a high ionization energy would most likely be what type of element?
A.
metal with a high electronegativity
O
B.
non-metal with a low electronegativity
o
C.
non-metal with a high electronegativity
O
D.
metal with a low electronegativity
Answer:
C
Explanation:
It is most likely non metal with a high electronegativity.
Young trees growing under another tree would cause?
Answer:
competition
Explanation:
it would cause competition. both would fight for water and other stuff to grow and live
PLEASE HELP
Which concept accounts for the whole-number subscripts in chemical formulas?
A. law of multiple proportions
B. Avogadro's law
C. conservation of energy
D. conservation of matter
Answer:
Law of multiple proportions
Explanation:
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How many molecules are found in 3.18 x 10^24 molecules of O2
Answer:
5.28 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.18 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 5.282392...[/tex]
We have the final answer as
5.28 molesHope this helps you
calculates the equivalent mass of calcium chlorate CA (CI03) 2
Answer:
207g
Explanation:
Given compound:
Ca(ClO₃)₂
The equivalent mass can be derived by summing the molar masses of each atom
Molar mass of Ca = 40
Cl = 35.5
O = 16
Now solve;
Molar mass = 40 + 2(35.5 + 3(16)) = 207g
an atom has 24 protons and 23 electrons and 28 neutrons what charge does this atom have?
-4
+4
-1
+1
Answer:
1+
Explanation:
the number of protons tells you which element it is in the periodic table, you can notice that there is 1 less electron that then there is protons which means that the element had to give 1 electron away. When you get rid of 1 e- you have 1 proton more that electrons so that's why it's 1+
also the element is Cr
what are the type of mixture in calloid, suspension and solution
Homogeneous and heterogeneous mixture in colloid, suspension and solution
A colloid is a heterogeneous mixture in which the dispersed particles are intermediate in size between those of a solution and a suspension and within the categories of homogeneous and heterogeneous mixtures there are more specific types of mixtures including solutions is alloys, suspensions, and colloids and a solution is a mixture where one of the substances dissolves in the other and the substance that dissolves is called the solute
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Hypertonic, Isotonic, or Hypotonic
cell biology
Statements 6,9,13,14 are hypertonic, 8,10,12 hypotonic, and 7,11,15 are isotonic solutions.
6. Hypertonic
7. Isotonic
8. Hypotonic
9. Hypertonic
10. Hypotonic
11. Isotonic
12. Hypotonic
13. Hypertonic
14. Hypertonic
15. Isotonic
A hypertonic answer is any external solution that has excessive solute awareness and coffee water concentration as compared to frame fluids. In a hypertonic answer, the internet movement of water will be out of the frame and into the solution.
A hypotonic answer has a decreased awareness of solutes than some other answer. In biology, a solution outdoor of a cell is referred to as hypotonic if it has a decreased attention of solutes relative to the cytosol. because of osmotic stress, water diffuses into the cell, and the cell often appears turgid, or bloated.
A solution that has the same salt concentration as cells and blood. Isotonic answers are typically used as intravenously infused fluids in hospitalized sufferers. Isotonic solutions include electrolyte stability just like plasma in the bloodstream. whilst an isotonic solution is administered, the fluid extent of the affected person is elevated without a fluid shift. not unusual examples of isotonic solutions are zero.nine% ordinary saline and lactated ringers.
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Explain the role of photosynthesis in the cycling of matter between the plant and the person?
The process of photosynthesis converts light energy into stored chemical energy by converting carbon dioxide plus water into sugars plus released oxygen.
What is photosynthesis ?Utilizing a process called photosynthesis, plants and other living things may transform light energy into chemical energy that can then be released through cellular respiration to power their activities. Photosynthesis, from the Greek phs (light) and synthesis (putting together), derives from the fact that some of this chemical energy is stored in carbohydrate molecules, such as sugars and starches, which are created from carbon dioxide and water.
Photoautotrophic organisms, such as the majority of plants, algae, and cyanobacteria, carry out photosynthesis. The majority of the energy required for life on Earth is produced and maintained through photosynthesis, which is also primarily responsible for producing and maintaining the oxygen concentration of the Earth's atmosphere.
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which graph above best represents the relationship between the volume and the pressure of a gas?
The graph (A) best represents the relationship between the volume and the pressure of a gas.
What is pressure?The force was applied perpendicular to an object's surface per unit area across which that force is spread is known as pressure. The relationship between pressure and volume can be understand with the aid of ideal gas law.
PV=nRT.
where, P is pressure, V is volume.
It can be seen that when temperature will kept constant then pressure will be inversely proportional to the volume. It can be shown as:
P ∝ 1/V.
Therefore, graph A represent relationship between pressure (P) and volume (V).
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what are the type of reactions in activation energy?
Answer:
n chemistry and physics, activation energy is the energy that must be provided to compounds to result in a chemical reaction.The activation energy (Eₐ) of a reaction is measured in joules per mole (J/mol), kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol). Activation energy can be thought of as the magnitude of the potential barrier (sometimes called the energy barrier) separating minima of the potential energy surface pertaining to the initial and final thermodynamic state. For a chemical reaction to proceed at a reasonable rate, the temperature of the system should be high enough such that there exists an appreciable number of molecules with translational energy equal to or greater than the activation energy. The term Activation Energy was introduced in 1889 by the Swedish scientist Svante Arrhenius.
Explanation:
Answer:
The activation energy for the forward reaction is the amount of free energy that must be added to go from the energy level of the reactants to the energy level of the transition state. The source of activation energy is typically heat, with reactant molecules absorbing thermal energy from their surroundings.
Explanation:
All the following are compounds except. A.water. B.sugar solution. C.aqueous. D.sulphur dioxide
Answer:
B.sugar solution
Explanation:
A sugar solution is not a compound.
Rather, the solution is a mixture and an impure substance.
A compound is composed of two or more kinds of atoms or elements joined in a definite grouping .The properties of the compound is distinct from those of the individual atoms that makes them. Sugar solution is sugar and waterIt is made up of two compounds not chemically combined.What should be done in order to increase the gravitational force between two objects?
Answer:
Decrease the distance between them or increase the mass.
Explanation:
F= GM1M2/ R²
Answer:
decrease the distance between the objects
Explanation:
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