A teacher is demonstrating physical and chemical changes to her class. Which action should they use to demonstrate a chemical change?. Single choice.
(5 Points)
Cutting a piece of paper with scissors.
Ripping a piece of paper with their hands.
Burning a piece of paper with a match.
Folding a piece of paper into an airplane.
which two elements have the same number of valence electrons?
Answer:
A and B
Explanation:
please mark me as brainliest
at what points do the object change direction
Answer:
i think its B C and D.........
Which statement is true about
radiation?
A. Radiation is the transfer of heat
through electromagnetic waves
B. Radiation is the transfer of heat
through direct contact
C. Radiation is more dangerous than
conduction
The statement i.e. true is A. Radiation is the transfer of heat
through electromagnetic waves
The following information should be considered:
Radiation refer to the energy that arrived from a source and travels via space at the speed of light. This energy should contain the electric field and a magnetic field associated with it.Learn more: https://brainly.com/question/994316?referrer=searchResults
Helium is part of group 8A, explain why helium fits with the pattern and why it is slightly different.
Helium is slightly different because this element only has 2 electrons on it.
I'm not sure though just search it if you want an accurate one.
What is the density of a cylinder with a mass of 65.34g, a height of 15.60 cm and a radius of 1.34 cm?
Answer:
d = 0.743 g/cm³
Explanation:
Given data:
Mass of cylinder = 65.34 g
Height = 15.60 cm
Radius = 1.34 cm
Density of cylinder = ?
Solution:
Volume of cylinder:
V = πr²h (π = 22/7)
V = 88 cm³
Density of cylinder:
d = m/v
d = 65.34 g / 88 cm³
d = 0.743 g/cm³
Atoms which lose electrons and become electrically charged are called ____.
fussion particles
ions
electrolytes
fission particles
Answer:
ions
Explanation:
When an atom gains or loses an electron, it becomes an ion. Ions formed by the loss of an electron have a positive charge, and those formed by gaining an electron have a negative charge. Positive ions are called cations, and negative ions are called anions. Cations and anions are attracted to each other.
An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. not an atom.
Answer:
ions
Explanation:
it was a easy answer
What action is modeled by the diagram? Explain
The action modeled by the diagram is; flow of ions ( cations and anions ) in a cell/compound
The diagram is used to represent the flow of control ( flow of ions ) in a system, it is similar to a data flow diagram, because the start, direction and endpoint of an activity diagram is the similar to that of a data flow diagram. Activity diagrams are also used to generally describe the steps in a use case system as seen in the diagram attached in the question.
Hence the diagram ( activity ) represents the flow of ions in a compound
learn more : https://brainly.com/question/16610518
At what temperature does gas stay
Answer:
i would say
112 degrees Fahrenheit
or
100 degrees celsius
Explanation:
brainliest pls if correct
HIiii. Hope y'all having a great day... so... i have a question...who's your favorite..rapper...singer....etc
u have 5 minutes GO!
Answer:
Louis Tomlinson, Emma Watson.
Explanation:
Thanks....you too ^_^
How many zeroes are significant in the measurement 0.0400200?
Answer:
4
Explanation:
if the 0 is in the beginning it is not significant.
0 in between are always significant.
the 0 at the end are only significant if theres a decimal.
What volume (in L) of carbon dioxide will
be produced from the reaction of 11.8L
of ethane (C2Ho)?
2C2H6(g) + 702(g) + 4CO2(g) + 6H2O(g)
The volume of carbon dioxide produced from 11.8 L ethane at STP is 22.4 L.
What is STP?The STP can be given as the standard temperature and pressure. The standard temperature is 25° C and 1 atm.
It is known that, 22.4 L of gas at STP is equivalent to 1 mole.
Thereby, concentration of ethane is:
22.4 L = 1 mole
11.8 L = 1/22.4 * 11.8 moles
11.8 L = 0.5 moles
From the balanced chemical equation:
2 moles ethane produce = 4 moles carbon dioxide
0.5 moles ethane produce = 4/ 2* 0.5 moles carbon dioxide
0.5 moles ethane produce = 1 moles carbon dioxide
The volume of 1 mole of gas at STP is 22.4 L. Therefore, 11.8 L ethane produces 22.4 L carbon dioxide.
Learn more about STP, here:
https://brainly.com/question/26107741
#SPJ2
Why solid heat faster than liquid?
A. Because the molecules of solid are far to each other
B. Because the molecules of solid are close to each other
C. Because the molecules of solid are not moving.
D. Because the molecules of solid are very small.
please answer me the correct answer
Answer:
The answer is B. The molecules of a solid are close to each other
What is the standard cell notation of a galvanic cell made with magnesium
(Mg) and gold (Au)?
Answer:
Mg(s) | Mg2 + (aq) Au + (aq) | Au(s)
Explanation:
The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) Mg(s) | Mg² + (aq) Au + (aq) | Au(s).
Thus, The cathode is the location of reduction, while the anode is the location of oxidation. The identity of the electrodes in a real cell depends on the direction that the net cell reaction is taking place.
If, during spontaneous operation, electrons move from the left electrode to the right electrode (as shown in the cell notation above), the right electrode's potential will be higher than the left electrode's, and the cell potential will be positive.
The direction of "conventional current flow" goes from positive to negative, which is the reverse of how electrons move. This means that a galvanometer installed in the external circuit would show a positive reading if the electrons are flowing from the left electrode to the right.
Thus, The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) Mg(s) | Mg² (aq) Au + (aq) | Au(s).
Learn more about Galvanic cell, refer to the link:
https://brainly.com/question/33558906
#SPJ2
Complete Table G to view the effect of surface area on the rate of reaction by transferring your data from Tables D and E to Table G.
Which form of the sodium bicarbonate tablet dissolves the fastest?
- Whole Tablet
- Quartered Tablet
- Crushed Tablet
Answer:
The answer would be
crushed tablet
Explanation:
just took the test on edg2020
Answer:
Crushed Tablet
Explanation:
A box has a length of 4 cm, a width of 10 cm, and a height of 2 cm. The volume of the box is:
18 cm
18 cm3
80 cm
80 cm3
what is the name of this iconic compund:
NaBr
Answer:
Sodium Bromide
Explanation:
Answer:
Sodium Bromide
Explanation:
Na is sodium, Br is bromine. Together they form the compound Sodium Bromide
What type of bonds are shown below?1091AQ1
A. Ionic
B. Polar covalent
C. Nonpolar covalent
D. There is not enough information to determine the answer.
I'm 99% sure it is A Ionic
Answer: It’s B, Polar covalent
Explanation:
How can you relate the blocks in the periodic table and the numbers of its column into the electron configuration
Answer:
The elements are listed by atomic number (the number of protons in the nucleus), and elements with similar chemical properties are grouped together in columns.
Which of the following natural factors is likely to support the formation of an oceanic island?
Erosion of undersea stalagmites and stalactites
Erosion of the face of a cliff by waves
Rising of magma from the seafloor
Rising sea level in low-lying areas
Answer:
i would say c, magma rising from the seafloor
Answer:
Your answer would be C
Explanation: Props to the guy above he did write it first
What is the relationship between the amount of sugar added and the amount of CO2 gas produced?
A. there is no relationship between amount of sugar added and carbon dioxide gas/size of balloon.
B. if more sugar is added, more carbon dioxide gas is produced, making the balloon larger
C. if more sugar is added, less CO2 gas is produced, making the balloon smaller
what is the specific heat of a 25.0 g substance that absorbs 493.4 j and raises the temperature from 12.0°c to 34°c?
Answer:
Specific heat of substance = 0.897 J/g.°C
Explanation:
Given data:
Specific heat of substance = ?
Mass of substance = 25.0 g
Heat absorbed = 493.4 J
Initial temperature = 12.0 °C
Final temperature = 34°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 34°C -12.0°C
ΔT = 22°C
493.4 J = 25 g ×c× 22°C
493.4 J = 550 g.°C ×c
c = 493.4 J / 550 g.°C
c = 0.897 J/g.°C
How is the mode of a data set defined?
It is the middle value of the set.
It is the most common value in the set.
It is the average of the different values in the se
It is the difference between the highest and lowe
What type of microscope would be best for studying the structures found inside of cells?
a
confocal microscope
b
stereoscope
c
electron microscope
d
compound microscope
What does mufasa mean when he says we are all connected in a circle of life?
Answer:
Prior to his death, Mufasa explains to Simba that “when we die, our bodies become the grass, and the antelope eat the grass, and so we are all connected in the great circle of life” . This is an ecological metaphor that goes beyond the human experience, intertwining the supernatural and physical world.
Explanation:
Answer:
Meaning in some form we all are related some how and that we all have history together
Explanation:
Portland cement (J. Aspdin) contains maximum % of CaO. Cement clinker contains
A) limestone & clay as raw materials
B) SiO2 to Al2O3 ratio 2.5 to 4.0 or [tex]\frac{CaO}{SiO2 + Al2O3+ Fe2O3}[/tex]
C) gypsum, fly ash and black ash (Na2CO3 + CaS)
D) [tex]Ca_{2}SiO_{4}-26%, Ca_{3}SiO_{5} -51%, Ca_{3}Al_{2}O_{6}-11% [/tex]
Answer:
The correct option is D
Explanation:
The major raw material used in making cement clinker is limestone. This limestone is usually mixed and heated with clay and can sometimes be mixed, in addition to the clay, with fly ash, black ash, bauxite, iron ore and gypsum. However, the product cement clinker contains different calcium silicates and/or aluminates such as Ca₃SiO₅, Ca₃Al₂O₆, Ca₂(Al,Fe)₂O₅ and Ca₂SiO₄. Thus, the correct option is D.
Question 15 (1 point)
Iron (II) Bromide contains one iron atom and two Bromine atoms. Replacing the anion
with oxygen would require more or less oxygen atoms? Why?
Answer:
Atoms are electrically neutral because the number of protons, which carry a 1+ charge, in the nucleus of an atom is equal to the number of electrons, which carry a 1- charge, in the atom. The result is that the total positive charge of the protons cancels out the total negative charge of the electrons so that the net charge of the atom is zero. Most atoms, however, can either gain or lose electrons; when they do so, the number of electrons becomes different from the number of protons in the nucleus. The resulting charged species is called an ion.
Cations and anions
When a neutral atom loses one or more electrons, the total number of electrons decreases while the number of protons in the nucleus remains the same. The result is that the atom becomes a cation—an ion with a net positive charge.
The opposite process can also occur. When a neutral atom gains one or more electrons, the number of electrons increases while the number of protons in the nucleus remains the same. The result is that the atom becomes an anion—an ion with a net negative charge. We can illustrate this by examining some very simple cations and anions, those formed when a single hydrogen atom loses or gains an electron.
Note: Hydrogen is actually somewhat unusual in that it readily forms both cations and anions. Most elements much prefer to form only one or the other. In terms of its electron configuration, can you explain why hydrogen can form both cations and anions? Feel free to post in the comments at the end of the article!
A hydrogen cation, a hydrogen atom, and a hydrogen anion.
A hydrogen cation, a hydrogen atom, and a hydrogen anion.
Classification cation neutral atom anion
No. of protons 111 111 111
No. of electrons 000 111 222
Net charge 111++plus 000 111-−minus
If a neutral hydrogen atom ( \text{H}Hstart text, H, end text, center) loses an electron, it becomes a hydrogen cation ( \text{H}^+H
+
start text, H, end text, start superscript, plus, end superscript, left). Conversely, if the neutral \text{H}Hstart text, H, end text atom gains an electron, it becomes a hydrogen anion ( \text{H}^-H
−
start text, H, end text, start superscript, minus, end superscript, right), also known as a hydride ion. Image credit: adapted from Boundless Learning, CC BY-SA 4.0.
In the center column, we have a diagram of a single, neutral hydrogen atom. It contains one proton and one electron; thus, its net charge is zero. If hydrogen loses its electron, it forms the cation \text{H}^+H
+
start text, H, end text, start superscript, plus, end superscript (left column). The \text{H}^+H
+
start text, H, end text, start superscript, plus, end superscript cation has a net charge of 1+ from the one proton in the nucleus since there are no electrons to cancel out the positive charge. If neutral hydrogen gains an electron, it forms the anion \text{H}^-H
−
start text, H, end text, start superscript, minus, end superscript (right column). The \text{H}^-H
−
start text, H, end text, start superscript, minus, end superscript anion has a net charge of 1- because it has one extra electron compared to the total number of protons.
Explanation: Hopes this gives a better explanation on them!
PLS HELP,THANKS:)
Which ball has the most potential energy?
A. A
В. В
C. C
D. D
SUBMIT
Answer:
A. A ball has most potential energy.
Which statement about quantum numbers is NOT
correct?
a
Two or more electrons in an atom can
have the same set of quantum numbers.
b
Quantum numbers describe the orbitals
of an atom.
с
Quantum numbers describe the location
of each electron in an atom.
d
Quantum numbers describe the energy
of each electron in an atom.
The statement that is not correct here is two or more electrons in an atom can have the same set of quantum numbers. The correct option is a.
What are quantum numbers?To describe the location of an electron in an associated atom, we use a series of specific numbers known as quantum numbers.
Quantum numbers describe the properties of atomic orbitals and the electrons within them. The state of an electron in an atom or ion is described by four quantum numbers.
The primary quantum number, denoted by n, represents the electron's primary energy level. Energy levels are fixed distances from an atom's nucleus.
According to the Pauli Exclusion Principle, no two electrons in an atom or molecule can have the same four electronic quantum numbers.
Because an orbital can only hold a maximum of two electrons, the electrons must have opposing spins.
Thus, the correct option is A.
For more details regarding quantum numbers, visit:
https://brainly.com/question/16977590
#SPJ2
Balance the following reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1."
Choose...
C 3 H 8 +
Choose...
O 2 →
Choose...
CO 2 +
Choose...
h2o
Answer:
4
C 3 H 8 +
13
O 2 →
8
CO 2 +
10
H 2 O
hope this helps :)