SCIENCEEEE!!!!! HELPPPP!!!!
pretty sure it's both are physical changes.
Answer:
I would say Both are only physical changes.
Explanation:
Melting wax isn't creating a new substance, or changing the atomic structure. The wax is only changes from a solid to a liquid state. Sanding a piece if wood is usually done with sandpaper, which can physically be done with your hands. Hope this helped :)
.A person is unable to see distinctly the objects placed at large distances but is able to read a book comfortably. Name the defect of vision he is suffering from
Answer:
The defect of vision suffered by the person is Myopia
Explanation:
The person can't see farther objects but is able to read a book which is placed closely to the eyes, using these observations the person is suffering from MYOPIA(nearsightedness) in which observer see close objects clearly but farther objects appear blurred.
The light entering the eye isn't correctly bent, the eyeball becomes big , or the eye lens become too converging, which converges the light ray in front of the cornea
This defect can be cured by using concave lenses.
In chemical reactions, how does the valence configuration of bromine tend to change?
Answer: Near the Protons. The electron structure of bromine is illustrated above. In chemical reactions, how does the valence configuration of Bromine tend to change? ... It loses one electron.
Explanation:
btw i found that on google lol
The large holes that can form in Limestone eventually lead to the formation of caves and caverns.
True or False?
What is chemical potential energy?
A. Energy stored by atoms
B. Energy stored in height differences
C. Energy from gravity
D. Energy of motion
Answer:
A
Explanation:
please pick me for brainliest
Answer:
D
Explanation:
All about the motion.
What is used to determine the number of a type of atom in a compound based on the chemical name?
- The periodic table
- chemical symbols
- prefixes
- the IUPAC
Answer:
Prefixes
Explanation:
The number of atoms of certain elements determines the prefix used.
What geological process changes pieces of rocks, minerals, and other material into sedimentary rock?
Enter the correct 4 digit code (no spaces) *
Answer:6969?
Explanation:
As elements go across from left to right in a period, they get closer to filling up their outermost electron energy shell. Their protons hold tightly onto their electrons. As they get closer to filling up their outermost electron energy shell, would it be harder or easier to take an electron away from them?
Answer: it would be harder to take an electron away.
Explanation:
The ionization energy is the energy required to remove an electron from the valence shell of an isolated gaseous atom of an element.
The atomic size decreases as we move from left to right in a period because the valence shell come closer to the nucleus as we move from left to right. Thus, the removal of electron from the valence shell becomes difficult due to greater attraction between nucleus and valence electron. Thus, the ionization energy increases from left to right in a period.
Thus it would be harder to take an electron away.
describe what the periods and groups on the periodic table are, how they are different, and what they tell us about an atoms structure.
Explanation:
Periods and groups describes the arrangement of elements on the periodic table using the atomic number of each of the given elements.
Elements having the same number of electrons in the outermost shell of their atoms are placed over one another in vertical columns. Each of the resulting vertical column is the group or family. The resulting horizontal row is known as the periods.Elements in the same period have the same number of energy levels or electronic shell.
The period of an element is an indicator of the energy levels in an atom. The groups precisely tells us the number of valence electrons in the atom.
Consider the equation:
4AI+3O2 → 2AI2O3
Is this equation balanced? Why or why not?
Answer:
Yes, it is balanced because the number of atoms of each element was same for both reactant side and product side.
Explanation:
Atoms of elements combine with one another to form compounds in a process called chemical reactions. In this case, atoms of Aluminum (Al) combines with atoms of Oxygen (O) to form Aluminum oxide (Al2O3).
However, for a chemical reaction to obey the law of conservation of mass, it needs to be BALANCED. Being balanced, for a chemical reaction, means the number of atoms of each element on the reactant side must equal the ones on the product side. To do this, coefficients are used at the back of each elements.
The original equation looks like:
AI + O2 → AI2O3
To make this balanced, coefficients 4 and 3 were used at the back of Al and O2 respectively while coefficient 2 was used behind Al2O3 as follows:
4AI+3O2 → 2AI2O3
Hence, the equation provided in this question is already balanced because the number of atoms of each element was same for both reactant side and product side.
Boiling Point is the __________. *
Answer:
it is a point at which a liquid Start's to evaporate
Explanation:
the point at which a liquid turns to gass
PLEASE HELP!! Due in a few minutes!!! BRAINLEST TO WHO ANSWERS FIRST!!!
2.2.4 Study: Reaction Rates
POSSIBLE POINTS: 1.
Collisions between reactant molecules lead to a reaction when the molecules have the correct orientation and enough kinetic energy
True
False
Answer:
True
Explanation:
Hope this isnt too late
Which of the following are true about a block of ice at -10°C as you continue to apply heat.
Its temperature will not rise above -10°C until it melts.
Its temperature will rise until reaching 0°C.
Its temperature will rise continuously until it completely melts.
Its temperature will remain at 0°C until all the ice melts.
02.04 Slide #2 Fill in the blanks based on the videos T Speed of reaction. When the of the reactants are moving too in a chemical reaction, there are fewer between particles. This means there are fewer for particles to correctly. Here you see two particles moving slowly. Though these particles seem ready to react, their slow speeds do not allow them to have the to react in this particular case. Instead, these particles just bounce apart. Particle alignment. If the particles of the reactants in a are not aligned Just right during a collision, they will away from one another. Here you see two particles moving toward each other. However, they are not facing each other in the right way to react. These particles just bounce away from each other.
Answer:
kylee is the best
Explanation:
Why do your body and your cells need water?
Explanation:
Water the essential constituent of protoplasm of living cells because it is directly involved in countless biochemical reactions like photosynthesis and respiration without it cells couldn't move waste and by-products taking nutrients perform intracellular Transportation functioning and signaling
A gas occupies 3.5L at 2.5 kPa pressure. What is the volume at 100 mmHg at the same temperature? Be sure to
show the setup and the final answer and unit.
Show Your Work
Answer:
V₂ = 0.656 L
Explanation:
Given data:
Initial volume = 3.5 L
Initial pressure = 2.5 KPa
Final volume = ?
Final pressure = 100 mmHg (100/7.501=13.33 KPa)
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
2.5 KPa × 3.5 L = 13.33 KPa × V₂
V₂ = 8.75 KPa. L/13.33 KPa
V₂ = 0.656 L
how does carbon dioxide get into the atmosphere?
Answer:
By condensation.
Explanation:
Have a nice day dear
composition variable
a, element
b. mixture
c. substance
d. compound
e. matter
Answer:
c. Substance
Explanation:
A composition variable is an intensive property that indicates the relative amount of a particular species or substance in a phase.
Answer:
is b the anwer is b
Explanation:
because mixture is a composition variable
A gas with a pressure of 820.4 mmHg occupies a
volume of 900.0 mL at a temperature of 25.0°C. If
the pressure does not change, what is the new
volume of the gas at 132.0°C?
A) 1220 L
B) 4750 L
C) 4750 mL
D) 1220 mL
Answer:
V₂ = 1223.2 mL
Explanation:
Given data:
Pressure of gas = 820.4 mmHg
Initial volume of gas = 900.0 mL
Initial temperature = 25.0°C (25+273=298K)
Final temperature = 132.0°C (132.0 +273 = 405 K)
Final volume = ?
Solution:
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
V₂ = V₁T₂/T₁
V₂ = 900.0 mL × 405 K / 298 k
V₂ = 364500 mL.K / 298 K
V₂ = 1223.2 mL
which of the following is not the same as 0.032 liters?
a)32 mL
b)0.00032 hL
c)320 cL
Based on the structural formulas above, which of the following identifies the compound that is more soluble in water and best helps to explain why?
(A) Ethane, because the electron clouds of its molecules are more polarizable than those of propanol.
(B) Ethane, because its molecules can fit into the spaces between water molecules more easily than those of propanol can.
(C) Propanol, because its molecules have a greater mass than the molecules of ethane have.
(D) Propanol, because its molecules can form hydrogen bonds with water molecules but those of ethane cannot.
Answer:
D. Ethane molecules have no hydrogen bonds and need less energy to separate.
Explanation:
Edge2020
Have a great day y'all :)
Based on the structural formulas, the compound that is more soluble in water and best helps to explain is Propanol, because its molecules can form hydrogen bonds with water molecules but those of ethane cannot. Therefore, option D is correct.
What do you mean by the chemical formula ?A chemical formula is a notation used by chemists to represent the number and kind of atoms present in a molecule. A written chemical formula is a straightforward illustration of an actual, three-dimensional molecule.
There are three main types of chemical formulas: empirical, molecular and structural.
Chemical bonds connecting the atoms of a molecule are located in structural formulae. A structural formula is made up of symbols for the atoms joined by brief lines that stand in for chemical bonds.
Propanol is the substance that is more soluble in water and better aids in explanation based on structural formulae, as opposed to ethane, whose molecules are unable to establish hydrogen bonds with water molecules.
Thus, option D is correct.
To learn more about the chemical formula, follow the link;
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A crystal is made up of _____
Explanation:
Atoms of the same element or atoms of different elements.
Which chemical equation below is balanced to correctly represent the Law of Conservation of Mass?
Answer:
The 3rd equation.
Cl2 + 2NaBr —> 2NaCl + Br2
Explanation:
The law of conservation of matter (mass) states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another. This implies that unbalanced chemical equation shows that matter (mass) has been created or destroyed.
Now, we shall determine which equation is balanced as follow:
1. 2Cl2 + NaBr —> 2NaCl + Br2
Reactant >>>>>>>> Product
4 Cl >>>>>>>>>>>> 2 Cl
1 Na >>>>>>>>>>>> 2 Na
1 Br >>>>>>>>>>>> 2 Br
Thus, the equation is not balanced.
2. Cl2 + NaBr —> NaCl + Br2
Reactant >>>>>>>> Product
2 Cl >>>>>>>>>>>> 1 Cl
1 Na >>>>>>>>>>>> 1 Na
1 Br >>>>>>>>>>>> 2 Br
Thus, the equation is not balanced.
3. Cl2 + 2NaBr —> 2NaCl + Br2
Reactant >>>>>>>> Product
2 Cl >>>>>>>>>>>> 2 Cl
2 Na >>>>>>>>>>> 2 Na
2 Br >>>>>>>>>>>> 2 Br
Thus, the equation is balanced.
From the illustration made above only the 3rd equation is balanced. And this is in line with the law of the Conservation of matter (mass) as matter (mass) was not created nor destroyed during the chemical reaction but was transferred to other forms.
what is the main material that make up the tusk of an elephant
Answer:
Ivory
Explanation:
The outside of the tusk is made of ivory, but 2/3 of the tusk is their head, made of tissue. But I think the answers Ivory. Thats the reason why poachers go for the tusks. Because humans like ivory :/
Revolution- is the orbiting of an object around another object... so what can i put as my example of revolution?
Answer:
The earth circling the sun
Ionic compound to name ai2o3
Explanation:
aluminium oxide had the chemical formula Al2O3
The name of ionic compound Al₂O₃ is aluminium oxide.
The naming of ionic compounds involves using the names of the constituent ions to form the compound's name. The name of the cation (positively charged ion) comes first, followed by the name of the anion (negatively charged ion).
Here are the general steps to name an ionic compound:
Name the cation: Use the name of the metal or polyatomic ion as it appears in the periodic table or ion list. If the metal has multiple oxidation states, use Roman numerals in parentheses to indicate the charge.Name the anion: For monatomic anions (single atoms), use the root name of the nonmetal element and add the suffix "-ide." For polyatomic anions (multiple atoms bonded together), use their specific names as listed in tables or formulas.Combine the names: Put the cation name first, followed by the anion name.Learn more about Naming of ionic compounds, here:
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How many molecules are in 32 grams of NH3?
Answer:
1.87897962011728
Explanation:
Explain difference in melting points for the elements Na and Mg
Answer:
magnesium has a greater charge, there will be greater attraction between delocalised electrons and the positively charged ion.
Explanation:
I did this once and got it right I hope you get it right too
Photosenthisis is a process in which plants prepare foodusing carbon dioxide chloriphil and water in the presence of sunlight during pphotosenthisus enerrgy is transformed into energy
Answer:
During photosynthesis SOLAR enerrgy is transformed into CHEMICAL energy.
Explanation:
In nutrition, green plants manufactures their own food which they use for both energy and growth. This is called an autotrophic mode of nutrition.
Therefore, photosynthesis is an autotrophic nutrition in which plant can build sugar by taking carbon dioxide from air and water from the soil. For the synthesis of sugar like glucose, carbon dioxide provides carbon
and oxygen whereas water molecules provide hydrogen. The plant builds sugar molecules from these simple compounds. Enzymes needed for this purpose are present in the cells and energy is trapped by chlorophyll from sunlight. This process is summarised in the equation below:
Sunlight (solar)
6CO2 + 6H2O--------------------> C6H12O6 + 6O2
From the equation, Carbon dioxide, water and sunlight (SOLAR energy) is the raw materials needed to produce Glucose and oxygen (CHEMICAL energy) as by products.