Answer:
A chemical change in a substances always alters the chemical composition.
Explanation:
Molecules always are combined to create a new substance, otherwise it would only be a physical change and the substance would have still had the same molecular design.
which statement describes the pattern in the density of gases in the atmosphere
Answer:They are less dense near the top of the atmosphere.
Explanation:
Net force= Direction= Right Balance or unbalance?=
Answer:Direction? tell me if im wrong!
Explanation:
what 2 word description did weebo and the professor use before they thought of the name flubber
Answer:
its fluid and rubber
Explanation:
fluid and subber made a solid.
Forces and Motion:Question 1
Acceleration is the rate of change in an object's...
Select one:
force.
gravity.
ооо
velocity
mass.
Answer:
velocity
Explanation:
Acceleration is the rate of change of velocity with time.
Acceleration= velocity/time
The type of bonding depicted below is most likely:
Answer:
C Ionic
Explanation:
Please help, i’ll mark you brainliest!!!
Answer:
See attached picture!
Explanation:
You are dealing with salts. This means that you write the name of the metal (sodium) with the name of the nonmetal (chloride). You need to change the end of the name of the nonmetal (chlorine to chloride; bromine to bromide).
To find the balanced compound, use the charges of the cations and anions. You need to write the compounds so that the total charge of the salt is 0.
PLEASE HELP WILL GIVE BRAINIESRT!!!!!!!!!!!!!!!!!!!!!!!!
#OFPROTONS
20
9
#OFNUTRONS
20
D
ATOMIC#
A
E
MASS#
B
19
ELEMENTSYMBOL
C
F
Using the periodic table, complete the table to describe each atom. Type in your answers.
A=
B=
C=
D=
E=
F=
A=20
B=40
C=Ca
D=10
E=9
F=F
Further explanationThe Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons. So the atomic number can also indicate the number of electrons.
So atomic number = number of protons = number of electrons
Mass Number (A) is the sum of protons and neutrons
Mass Number (A) = Number of protons + Number of Neutrons
So that the relationship between atomic numbers and mass numbers can be formulated as follows:
Atomic Number (Z) = Mass Number (A) - Number of Neutrons
A=atomic number=number of protons=20
B=mass number=protons+neutrons=20+20=40
C=the element with atomic number 20 and mass number 40 is Ca,
[tex]\tt _{20}^{40}Ca[/tex]
D=number of neutrons=mass number-number of protons =19-9=10
E=atomic number=number of protons=9
F=the element with atomic number 9 and mass number 19 is F
[tex]\tt _9^{19}F[/tex]
Based on these drawings, which element is the least reactive?
Answer:
youre not showing a drawing. look at the table. electronegativity trend is “down” and “right”. you should get your answer by looking at that trend. the more electronegative, the more reactive.
In the interactive, start adding neutrons to the nucleus.
What happens to the mass number each time you add a neutron, and why?
Answer:
Explanation:
Each time you add a neutron, it adds one mass number to the mass because each neutron and proton weighs approximately 1 amu.
Answer:
The mass increases
Explanation:
When protons and neutrons are added, the mass increases. Electrons, on the other hand, are so small they do not affect the mass.
HELP ME PLEASEEEEEEE!?!?!?!!
Answer:
amps is how hard it is for the volts to get through hope this helped
Explanation:
What is a chemical reaction?
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A chemical reaction happens only under special circumstances.
A chemical reaction is when the bonds of one substance form and then break which makes something different.
A chemical reaction has infinite possiblities to happen.
A chemical reaction is when the bonds of one substance break and form new bonds to make something different.
ос
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Answer:
a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction
If a neutral charged object is placed near a negatively charged object, what will it do?
Answer:When you bring a negatively charged object close to a neutral pith ball, it creates a positive charge (i.e. opposite of negative) on the portion of pith ball nearer the negatively charged object and negative charge on the farthest portion of pith ball.
Explanation:
Answer:
Explanation:
When you bring a negatively charged object close to a neutral pith ball, it creates a positive charge (i.e. opposite of negative) on the portion of pith ball nearer the negatively charged object and negative charge on the farthest portion of pith ball.
When a liquid freezes into a solid, the particles of the substance:
A.Lose energy
B.Gain energy
C.Move faster
D.Disappear
Answer:
(see below)
Explanation:
Using process of elimination:
A) lose energy
When a liquid freezes into a solid, the particles move a lot slower because the once-flowing particles are now about to be stuck in place, barely vibrating in its structure.
So, yes, they has lost energy, but there can be a better answer.
B) gain energy
When a liquid freezes into a solid, the particles move a lot slower, so there is no way there is more energy now. If there was to be more energy, it would be a gas now.
So, no, they did not gain energy.
C) move faster
When a liquid freezes into a solid, the particles move a lot slower, so there is no way they're moving faster now. Otherwise it would be a gas now.
So, no, they did not move faster.
D) disappear
Particles of a substance don't just . . . disappear. There is no way matter can be destroyed or created, only changed in form, according to the Conservation of Matter.
So, no, they did not disappear.
So the answer is most likely A.
what are two pure substances that whould make a mixure and could then be separated from the mixure with a magnet
Answer:
We can separate iron from a mixture of sand and iron, as only the iron is attracted to the magnet.
Explanation:
Which parts do all cells have in common?
a Golgi apparatus
b mitochondria
C ribosomes
d nucleus
Answer:
a Golgi apparatusExplanation:
Why does an ionic bond have a high melting point?
A. Very little energy is required to overcome the repulsive forces that hold the ionic crystal together.
B. A lot of energy is required to overcome the attractive forces that hold the ionic crystal together.
C. A lot of energy is required to overcome the repulsive forces that hold the ionic crystal together.
D. Very little energy is required to overcome the attractive forces that hold the ionic crystal together.
Answer:
B
Explanation:
i just take the test
An ionic bond has a high melting point because a lot of energy is required to overcome the attractive forces that hold the ionic crystal together. The correct option is B.
In an ionic bond, atoms transfer electrons to form positively charged cations and negatively charged anions. These oppositely charged ions are attracted to each other, creating strong electrostatic forces between them.
When a solid ionic compound is heated, the thermal energy increases, causing the ions to vibrate more vigorously. As the temperature continues to rise, the ions gain enough energy to break free from their fixed positions within the crystal lattice. This requires a lot of energy because the attractive forces between the ions are strong and must be overcome.
Thus, the correct option is B.
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Jen is walking her dog at a constant rate.
They keep a constant rate as they turn a
corner. Why has their velocity changed?
Answer:
4is the answer
Explanation:
What is the funtion of an atomic atom?
1) Sarah's family raises chickens,
They buy 15 pounds of feed per
week. If chickens eat all but 4
pounds, how many ounces of
feed did they eat?
Answer:
hhdbnahdhs
Explanation:
hajsbbdjsod
An EMR photon is transmitted by as a 100 MHz FM radio wave. What is it’s A) wavelength B) energy of one photon C) Total energy of 1x10^18 photons?
A. λ = 3 m
B. E = 1.9878 x 10⁻³³ J
C. Total energy : 1.9878 x 10⁻²⁰ J
Further explanationThe photoelectric effect is an electron coming out of a metal because of electromagnetic radiation
One type of electromagnetic radiation is light
Radiation energy is absorbed by photons
The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
Where
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
f = c / λ
c = speed of light
= 3.10⁸
λ = wavelength
A. wavelength
[tex]\tt \lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3.10^8}{1.10^8~Hz}=3~m[/tex]
B. energy of one photon
[tex]\tt E=h\times f\\\\E=6.626\times 10^{-34}\times 3=1.9878\times 10^{-33}~J[/tex]
C. Total energy
[tex]\tt 1.9878\times 10^{-33}\times 10^{18}=1.9878\times 10^{-20}[/tex]
During an experiment, Jon exhales through a straw and blows bubbles into a solution. Which observation would most likely indicate that a chemical reaction is occurring?
The bubbles disappear into the solution before reaching the surface.
The gas forms a layer above the surface of the solution.
The solution becomes very stirred up by the bubbles.
The solution becomes cloudy with a white solid.
Answer:
Im not sure but I think is D.The solution becomes cloudy with a white solid.
Explanation:
Answer:
the answer is D the solution becomes cloudy with a white solid
Explanation:
which of the folllowing is NOT a mixture?
A. table salt
B. lemonade
C. garden soil
D. salad dressing
2NaOH + H2SO4 → Na2SO4 + 2H20
(What reaction would occur)
help on this question please
Which type of rock is a foliated metamorphic rock?
granite
marble
quartzite
slate
Answer:
Slate
Explanation:
Answer:
D. Slate
Explanation:
Had the quiz, got it right
An investigation was done with an electromagnetic system made from a battery and wire wrapped around a nail. Different sizes of nails were used. The number of paper clips the electromagnet could pick up was measured. What's the independent variable and dependent variable?
Answer:
Independent variable: SIZE OF NAILS
Dependent variable: NUMBER OF PAPER CLIPS
Explanation:
The independent variable in an experiment is the variable that is changed or manipulated by the experimenter in order to effect a measurable response. In this investigation, the DIFFERENT SIZES OF NAILS USED is the INDEPENDENT VARIABLE.
The dependent variable is the variable that is measured in the experiment. It is the variable that responds to changes made to the independent variable. In this investigation, THE NUMBER OF PAPER CLIPS the electromagnet could pick up is the DEPENDENT VARIABLE.
The dependent variable is the number of paper clips that the electromagnet could pick up while the independent variable is sizes of nail used.
An experiment consists of;
a dependent variable and an independent variable.The independent variable is the variable that is being manipulated while the dependent variable changes with changes in the independent variable.
In this experiment, the dependent variable is the number of paper clips that the electromagnet could pick up while the independent variable is sizes of nail used.
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A teacher placed a plastic cup of warm coffee with a lid in the freezer.
Which statement describes the frozen coffee in comparison with the warm coffee?
A. The arrangement of the coffee molecules in the same
B. The temperature of the coffee has increased
C. The amount of coffee in the same
D. The speed of the coffee molecules has increased
Answer:
C. The amount of coffee is the same.
Explanation:
Verified
What's the difference between the "matter that makes up wood" and the "matter that makes up water"? Explain your ideas in full sentences.
They describe different forms of matter, solid and liquid. As well as both being entirely differently structured forms of matter.
They distinguish between solid and liquid matter. In addition to being completely different types of matter.
What is matter?Matter is defined as everything that takes up space other words, the "material" that makes up the universe.
All matter is composed of substances known as elements, each of which has unique chemical and physical properties and cannot be decomposed into other materials through ordinary chemical reactions.
Atoms and molecules make up some of the material in the category of solids, liquids, and gases.
The matter that makes up wood have characteristics of any solid, i.e., high intermolecular force of attraction that holds it shape.
The matter that is making water will have liquid characteristics, which do not have a particular shape and will have weak intermolecular forces of attraction.
Thus, this is the chief difference between the "matter that makes up wood" and the "matter that makes up water".
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Why does a ballon with helium gas rise higher than a ballon with air
Answer: helium is a lighter (less dense) gas allowing the balloon to rise high
I hope this helped!
Answer:
helium is less dence then air
Hoped this helps! have a great day lovee
please help me out with this!!
Answer:
C?
Explanation: