Hello can someone help me out i will give brainliest.. chemical or physical change hwwwww
Answers
Answer:
11. physical
19. chemical
10. chemical
12. physical
18. chemical
Explanation:
that should be right, I'm not exactly sure though
Related Questions
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?
Answers
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.
A science teacher placed a magnesium wire in flame.the wire turned white where the flame touched it. which statement best explains the chemical change
A. a new substance formed
D. the magnesium wire changed shape
the subject is science
Answers
Answer:
A
Explanation:
The correct answer would be that a new substance is formed.
When magnesium wire is burnt in the presence of oxygen, the wire reacts with oxygen and a new substance known as magnesium oxide is formed. The new substance is usually white in color and the equation of the reaction is as below:
[tex]2 Mg (s) + O_2 (g) --> 2 MgO (s)[/tex] (white)
Hence, the correct option is A.
Answer:
Explanation:A new substance formed. Promise.
how does carbon dioxide get into the atmosphere?
Answers
Answer:
By condensation.
Explanation:
Have a nice day dear
What is chemical potential energy?
A. Energy stored by atoms
B. Energy stored in height differences
C. Energy from gravity
D. Energy of motion
Answers
Answer:
A
Explanation:
please pick me for brainliest
Answer:
D
Explanation:
All about the motion.
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
Answers
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
composition variable
a, element
b. mixture
c. substance
d. compound
e. matter
Answers
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
Ionic compound to name ai2o3
Answers
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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Boiling Point is the __________. *
Answers
Answer:
it is a point at which a liquid Start's to evaporate
Explanation:
the point at which a liquid turns to gass
describe what the periods and groups on the periodic table are, how they are different, and what they tell us about an atoms structure.
Answers
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.
How many molecules are in 32 grams of NH3?
Answers
Answer:
1.87897962011728
Explanation:
Why do your body and your cells need water?
Answers
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
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.
Answers
HELPPPP!!! I NEED IT VERY MUCHHHH
Answers
Answer:
mabye C at least if its not right sorry .
state the volume of SO2 and O2 at RTP that would produce 180cm3 of SO3
Answers
Answer:
(180 cm^3 SO3) x (2 mol SO2 / 2 mol SO3) = 180 cm^3 SO2
(180 cm^3 SO3) x (1 mol O2 / 2 mol SO3) = 90 cm^3 O2
what is the main material that make up the tusk of an elephant
Answers
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 :/
.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
Answers
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.
Consider the equation:
4AI+3O2 → 2AI2O3
Is this equation balanced? Why or why not?
Answers
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.
Which chemical equation below is balanced to correctly represent the Law of Conservation of Mass?
Answers
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.
The large holes that can form in Limestone eventually lead to the formation of caves and caverns.
True or False?
Answers
True
Explanation:
Because it would be false That Caves and caverns are common in dry regions where these is a layer of limestone near the surface.
Which of these is an example of physical change
A) iron melting
B) steel rusting
C) paper burning
D) wood decaying
Answers
Answer:
it is A mark me big brain pls
Explanation:
which of the following is not the same as 0.032 liters?
a)32 mL
b)0.00032 hL
c)320 cL
Answers
How many valence electrons would be shown in the electron dot diagram of a helium atom?
Answers
Answer:2
Explanation:
The number of valence electrons for a helium atom is 2. This can be confirmed by looking at the electronic configuration.
Helium atom:Helium is placed in the noble gas series as it has certain properties of it. The atomic number of helium is 2. Thus, it has two electrons in its outermost shell but it has completely filled orbital.
Electronic configuration of He = 1s2
Thus, for drawing the electron dot structure, there are two valence electrons.
Find more information about Helium atom here:
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What type of relationship exists between
dissociation constant and pk values
A Linear
B Directly Proportional
C Direct
D Inverse
Answers
Answer: D inverse . The product of Ka and Kb equals the auto-dissociation constant for water.
Explanation: i hoped that helped and Plz give as a brainliest !!
BEBE
Use the activity series below to predict whether the following reactions will take place.
803
F2 > Cl2 > Br2 > 12
Cl2 + 2Rbl - 2RbCI+ 12
12 + NiBr2 - Nil2 + Brz
yes
yes
no
0
no
Answers
Reaction 1 : yes
Reaction 2 : no
Further explanationThe 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
From activity series of Halogen :
F₂>Cl₂>Br₂>I₂
F₂ is the strongest oxidizing agent
1. Reaction
Cl₂ + 2Rbl - 2RbCI+ I₂
Cl₂>I₂⇒reaction can occur⇒yes, reactions will take place.
2. Reaction
I₂ + NiBr₂ - NI₂ + Br₂
Br₂>I₂⇒Reaction can't occur⇒no, reaction will not take place
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.
Answers
Answer:
kylee is the best
Explanation:
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
Answers
Answer:
Prefixes
Explanation:
The number of atoms of certain elements determines the prefix used.
SCIENCEEEE!!!!! HELPPPP!!!!
Answers
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 crystal is made up of _____
Answers
Explanation:
Atoms of the same element or atoms of different elements.
What is the final temperature when 625 grams of water at 75.0° C loses 7.96 x 104 J?
The specific heat of water is 4.18 J/gCº.
Answers
Answer: A copper cylinder has a mass of 76.8 g and a specific heat of 0.092 cal/g·C. It ... J ql = mwcwΔTw. ΔTw = ql/(m x c). ΔTw = 7.96 x 10. 4. J/(625 g x 4.18 J/g·K) = 30.5 ...
Explanation:
The composition of a compound is 6.27 g calcium and 1.46 g nitrogen.
Calculate the empirical formula.
Answers
Answer:
Ca₃N₂
Explanation:
The empirical formula is the simplest whole-number ratio between moles of each element present in a molecule.
Thus, we need to convert mass of each atom to moles and find the ratio between these as follows:
Moles N:
1.46g * (1mol / 14.0067g) = 0.104moles
Moles Ca:
6.27g * (1mol / 40.078g) = 0.156moles
The ratio between Moles N and moles of Ca is:
0.156moles / 0.104 moles = 1.5
That means there are 1.5 moles of Ca per mole of N. As empirical formula must be given in whole numbers:
There are 3 moles of Ca per 2 moles of N.
Empirical formula is:
Ca₃N₂