Question:
Which of these is a chemical property of a substance?
A) Density
B) Color
C) reactivity
D) melting point
Answer:
C) Reactivity
Explanation:
We identify Reactivity as a chemical property because it dose Change to the chemical nature of matter such as change the way why the earth looks. One example of Reactivity is when we have earthquakes. But Things like Density, Melting point and color are signs of Physical properties because they do not change the chemical nature of matter.
The answer would be reactivity
What causes damage to the ozone layer?
Jenny has appealed to the local government to ban the use of aerosol room fresheners because they contain
, which can damage the ozone layer.
Answer:
Chlorofluorocarbons (CFC's)
Explanation:
The substances that are the most responsible for the damage done on the ozone layer are the chlorofluorocarbons (CFC's). The CFC's are very light, so they get up into the atmosphere with ease. While they are in the lower part of the atmosphere they do not cause any particular problems as the UV radiation is very limited, but that all changes when they reach the ozone layer. Once they reach the ozone layer in the stratosphere, the CFC's are exposed to much stronger UV radiation. This causes them to dissociate and release chlorine atoms. Once this has happened, these atoms manage to break down the bond between the oxygen atoms, thus destroying the ozone layer.
planet-solar system-galaxy-local group. what comes next
Answer:
Super cluster
Explanation:
Which of the following has to happen before the eardrum begins to vibrate with the same frequency as the source of the sound waves? A. Vibrations have to be transmitted to the fibers of the auditory nerve. B. Impulses have to be sent to the brain through the auditory nerve. C. The outer ear has to collect the sound waves and lead them to the middle ear. D. The brain has to interpret the direction from which the sounds are being delivered.
Answer:
C. The outer ear has to collect the sound waves and lead them to the middle ear.
Explanation:
In the process of hearing, the first thing that happens is that sound waves enter the outer ear through a passage called "auditory canal" that reaches the eardrum.
The movement of the incoming sound waves causes the eardrum to vibrate and transmit these vibrations to three tiny bones of the middle ear.
Answer: i think its c
Objects 1 and 2 attract each other with a electrostatic force of 72.0 units. If the charge of Object 2 is tripled, then the new electrostatic force will be ____ units
Answer:
216.0 units
Explanation:
The electrostatic force between two charged objects is given by:
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the distance between the charges
In this problem, the charge of object 2 is tripled, so
[tex]q_2 ' = 3 q_2[/tex]
Substituting into the original equation,
[tex]F'=k\frac{q_1 (3 q_2)}{r^2}=3 (k\frac{q_1 q_2}{r^2})=3 F[/tex]
So, the electrostatic force will be tripled.
Since the initial electrostatic force is
F = 72.0 units
the new force will be
[tex]F' = 3 F = 3(72.0 )=216.0[/tex]
Answer:
216
Explanation:
Which conditions are necessary for clouds to form?
Final answer:
Clouds form when water vapor condenses into tiny droplets that aggregate around small particles or nuclei and then fall as precipitation.
Explanation:
Clouds form under specific conditions. The necessary conditions for clouds to form include:
Rising air currents that carry water vapor into the atmosphereThe cooling of water vapor as it rises, causing it to condense into tiny droplets of liquid waterThe droplets reaching a certain size and aggregating around small particles or nucleiIf the droplets become large enough, they fall as precipitation, such as rain, snow, or hailThese processes are part of the water cycle, where water evaporates from the ocean, condenses in the atmosphere, and eventually falls back to the Earth as precipitation.
sort the phrases according to whether they belong in the category of permanent or temporary magnets
Permanent magnet:
Hard to demagnetize
Hard
Bar magnet
Temporary magnet:
Easy to demagnetize
Soft
Thumbtack
Answer:
Permanent magnet: Temporary magnet:
Hard to demagnetize Easy to demagnetize
Hard Soft
Bar magnet Thumbtack
The of the line on a velocity vs. time graph represents acceleration.
Answer:
The slope
Explanation:
The slope of the line on a velocity vs. time graph represents acceleration.Acceleration is the velocity made by a moving body per unit time. In other words is velocity per unit time. Acceleration is given by the formula;Acceleration = (final velocity -initial velocity)/time. This means acceleration depends on time taken to attain a given velocity and velocity of the moving body.The SI units of acceleration are; meters/square seconds(m/s²)Answer:
Slope
Explanation:
Select the correct answer. Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the water tastes salty. What kind of change has occurred? A. It’s a chemical reaction because a new substance has formed. B. It’s a physical change because the water and the salt kept their original properties. C. It’s an example of synthesis because two substances reacted to give one substance. D. It’s a chemical reaction because the water now tastes salty but originally did not.
Answer:
A
Explanation:
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Therefore it can not be any of the other answers because the substance was water at first but now its salty water.
ps what kind of person would drink water after you put salt in it lol.
On the decibel scale, an increase of 10 decibels means an intensity increase of __________times?
Answer:
10
Explanation:
The decibel or decibel, is a unit that relates two values of sound pressure, and electrical power. the base unit is the bel, but given the amplitude but for practicality, a submultiple, the decibel, is used. It is a scalar expression .
Zero belios is the reference value used as a base, hence a bel is equivalent to 10 decibels and means that there is a power increase of 10 times over the reference value.
How do you sound waves transfer energy
In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. In water waves, energy is transferred through the vibration of the water particles.
MARK ME BRAINLIEST PLEASE!!!!
Answer:
Sound waves transfer energy by causing successive compressions and rarefactions in the particles of the medium without transporting the medium particles themselves.
Explanation:
Sound in solids can also manifest as transverse waves, causing crests and troughs in the propagation medium. Waves can be characterized by two basic parameters: amplitude and frequency. Focusing on a single point vibrating in a medium excited by a sound wave, amplitude is the maximum distance traveled by the vibrating point relative to its rest position. Taking a snapshot of a propagating sound wave at any instance shows consecutive compressions and rarefactions, regions in which the medium material is compressed together and spread widely apart, respectively. The distance between the centers of two successive compressions or rarefactions is the wavelength of the wave. The frequency is the inverse of the wavelength, so the larger the frequency, the smaller the wavelength. Having a higher frequency makes the wave have a larger number of more closely-grouped compressions and rarefactions as it propagates. As the amplitude and frequency of the wave increase, the energy transferred by the propagation of the wave also increases. Extremely short but low-amplitude ultrasonic waves can be used to heat polymer materials and weld them together.
The force of air particles over an area is A.) temperature B.) pressure C.) Volume D.) Kelvins
Answer:The anwser is B i Promise ok
Explanation:
Answer: B
Explanation: I just did it.
What can cause the loss of soil that is not protected by plant cover?
Loss of soil not protected by plant cover can be caused by erosion, pollution, and overuse/improper farming practices.
Explanation:Loss of soil that is not protected by plant cover can be caused by various factors:
Erosion: Without plant cover to hold the soil in place, wind and water can easily carry away the top layer of soil, causing erosion.Pollution: Chemicals and pollutants can leach into the soil, making it less fertile and unsuitable for plant growth.Overuse and improper farming practices: Continuous farming on the same land without proper crop rotation or allowing the land to rest can deplete the nutrients in the soil, leading to its loss.Learn more about Causes of soil loss here:https://brainly.com/question/12535915
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why did scientist reject Lamarck's idea of evolution?
A. Organisms have not changed through earths history.
B. Organisms cannot change their characteristics during their life time.
C. Traits acquired during a lifetime are not passed through offspring.
D. Traits acquired during a lifetime are of no use to an individual.
Explanation:
Lamarck's theory of evolution, also called as theory of inheritance of acquired traits was rejected because he suggested that the acquired characteristics which an organisms acquires through its life experiences are transferred to its next generation, which is not possible since acquired characters does not bring any change to an individuals set of genes.
Answer: Traits acquired during a lifetime are not passed through offspring. (C.)
a tennis ball has a mass of 57.5 g, how much does it weigh? (do a conversion)
Answer:
0.1267658 pounds
0.0575kg
Explanation:
You were not specific at to which measurement you would have liked me to convert it to. I assume it would be in kilograms since that is the measurement used in science for weight. I have added pounds as well in case you were looking for an alternative weight.
calculate the electrical energy consumed by 1200 W toaster in 30 min
Electrical energy = Power x time.
30 minutes = 0.5 hours.
Electical energy = 1200W x 0.5 hours = 600W/hour = 0.6kWh
Two identical ions are each missing two electrons, each ion has a charge of 2e. What is the magnitude of the force between the ions when their separation is 2.1×10−10m? k=8.99×109N⋅m2/C2, e=1.60×10−19C
Answer:
|F| = 2.09 × 10⁻⁸ assuming that the two ions are point charges.
Explanation:
What's the charge on each ion?
The symbol [tex]e[/tex] here stands for fundamental charge. Each electron carries a negative fundamental charge of -e. Each proton carry a positive fundamental charge of +e.
Molecules and atoms are neutral. They contain an equal number of electrons and protons. Remove one electron from a molecule or atom, and that particle will end up with more protons (which are positive) than electrons. That particle will carry a positive charge of +e become an ion (a cation to be precise.) Remove another electron and the ion will carry a charge of +2e.
For each ion [tex]q = +2 \;e = 2\times 1.60\times 10^{-19}\;\text{C} = 3.2\times 10^{-19}\;\text{C}[/tex].
What's the size of the electrostatic force between the two ions?
Consider Coulomb's Law for the electrostatic force [tex]F[/tex] between two point charges:
[tex]\displaystyle F = -\frac{k\cdot q_1\cdot q_2}{r^{2}}[/tex],
where
[tex]k[/tex] is Coulomb's constant,[tex]q_1[/tex] and [tex]q_2[/tex] are the charge on the two point charges, and[tex]r[/tex] is the separation between the two charges.Make sure that all values are in SI units. Assume that the two ions are small enough that they act like point charges:
[tex]\displaystyle \begin{aligned}F &= -\frac{k\cdot q_1 \cdot q_2}{r^{2}}\\&=-\frac{8.99\times 10^{9}\cdot(3.2\times 10^{-19}) \cdot (3.2\times 10^{-19})}{(2.1\times 10^{-10})^{2}}\\ &= -2.09\times 10^{-8}\;\text{N}\end{aligned}[/tex].
The value of [tex]F[/tex] is negative, meaning that the two charges will repel each other because they are both positive. The question is asking for the magnitude of this force. Thus drop the sign in front of [tex]F[/tex] to obtain [tex]2.09\times 10^{-8}\;\text{N}[/tex], which is the magnitude of [tex]F[/tex].
Using Coulomb's Law, the magnitude of the force between two identical ions, each missing two electrons and separated by 2.1×10⁻¹⁰ m, is approximately 2.09 × 10⁻⁹ N.
To find the magnitude of the force between two identical ions, we use Coulomb's Law:
F = k × (q1 × q2) / r²
Here, k is the electrostatic constant, 8.99 × 10⁹ N⋅m²/C², q₁ and q₂ are the charges of the ions, and r is the separation distance between them.
Given:
Each ion has a charge of 2e, where e is the elementary charge (1.60 × 10⁻¹⁹ C).Separation distance r = 2.1 × 10⁻¹⁰ m.First, calculate the charge of each ion:
q₁ = q₂ = 2 × 1.60 × 10⁻¹⁹ C = 3.20 × 10⁻¹⁹ C
Next, substitute the values into Coulomb's Law:
F = (8.99 × 10⁹ N⋅m²/C²) × [(3.20 × 10⁻¹⁹ C) × (3.20 × 10⁻¹⁹ C)] / (2.1 × 10⁻¹⁰ m)²
Simplify the calculation:
F = (8.99 × 10⁹) × (10.24 × 10⁻³⁸) / (4.41 × 10⁻²⁰)
F ≈ 2.09 × 10⁻⁹ N
Therefore, the magnitude of the force between the ions is approximately 2.09 × 10⁻⁹ N.
What is the downward pull on an object due to gravity?
Answer:
force of gravity
Explanation:
The force of gravity is that which draws the bodies towards the surface of the Earth.
The force of gravity brakes the objects that move up and accelerates those that move down. It causes a parabolic movement in what we throw upwards,
The download pull of an object due to gravity is the object's weight.
Explanation:
When an object is thrown upwards from a certain height, it goes to a certain distance and then due to a downward force experienced by the object from the ground, it makes it to fall towards the ground.
This downward force is called as acceleration due to gravity and the pull is being experienced due to object's weight.
if a boulder has a weight of 675,000 N what is it’s mass
Weight = (mass) x (acceleration of gravity where the object is)
You didn't tell us WHERE the boulder is, so I have to assume that it's on Mars, where the acceleration of gravity is 3.71 m/s².
675,000 N = (mass) (3.71 m/s²)
Mass = (675,000 N) / (3.71 m/s²)
Mass = 181,941 kilograms
The same weight on Earth would suggest a mass of only 68,807 kg, so you can see how important it is to know where you are when you make your measurements.
Which of the following is an example of a physical change but not a chemical change?
A) The log gives off heat and light as it burns
B) A tree stores energy from the sun in its fruit
C) A penny lost in the grass slowly changes color
D) A water pipe freezes and cracks on a cold night
A water pipe freezes and cracks on a cold night. (D)
There are three physical changes going on in this scenario:
1). The air gets cold and dark at night.
2). The water in the pipe freezes and expands.
3). The pipe cracks.
There are no chemical changes in the description.
Answer:
A water pipe freezes and cracks on a cold night
Explanation:
A water pipe freezing and cracking is a physical change, not a chemical change. A physical change is a change in what the item looks like, feels like, or how the item has a different form. The water pipe freezing is an example of a physical change because the liquid water has turned to frozen water. The frozen water has expanded the pipe, causing it to crack. There are no chemical changes taking place in this scenario.
Mordancy.
What does the diagram represent?
Answer:
this is a diagram illustrating the valance electrons on an oxygen atom
The diagram represents an oxygen atom Option A
An oxygen atom is a chemical element represented by the symbol "O" on the periodic table. It is classified as a non-metal and has an atomic number of 8, indicating the number of protons in its nucleus. The most common isotope of oxygen, found in nature, is oxygen-16, meaning it has 8 protons and 8 neutrons.
Oxygen is essential for life and is a crucial component of many compounds, including water (H2O) and various organic molecules. It plays a vital role in cellular respiration, the process by which living organisms extract energy from nutrients.
The electron configuration of an oxygen atom is 1s² 2s² 2p⁴, indicating the distribution of its eight electrons in different energy levels and orbitals.
Oxygen atoms tend to form covalent bonds with other atoms, sharing electrons to achieve a stable configuration. Molecular oxygen (O2) is a diatomic molecule, consisting of two oxygen atoms bonded together.
What is the current in a circuit with a 6.0 V battery and a 2.0 Ω resistor?
Answer: As per Ohm's law current= voltage divided by resistance.
Explanation:
So answer is 6/2= 3 amperes.
For this case, we have by definition, that Ohm's Law states that:
[tex]I = \frac {V} {R}[/tex]
Where:
I: It's the current
V: It's the voltage
R: It's the resistance
We have to:
[tex]V = 6V[/tex]
R = 2Ω
Substituting:
[tex]I = \frac {6} {2}\\I = 3[/tex]
Also, we have that the units of the current, by dividing volts between ohms, will be amps.
Thus, the current is [tex]I = 3 \ A[/tex]
Answer:
[tex]I = 3 \ A[/tex]
Compute the resistance in ohms of a lead block 10 cm long and .10 cm^2 in a cross sectional area (p=2.2 x 10^-5 ohm-cm
Answer:
[tex]2.2\cdot 10^{-3} \Omega[/tex]
Explanation:
The resistance of the lead block is given by
[tex]R=\frac{\rho L}{A}[/tex]
where
[tex]\rho = 2.2\cdot 10^{-5}\Omega cm[/tex] is the resistivity of lead
[tex]L = 10 cm[/tex] is the length of the block
[tex]A=0.10 cm^2[/tex] is the cross sectional area of the block
Substituting into the equation, we find
[tex]R=\frac{(2.2\cdot 10^{-5} \Omega cm)(10 cm)}{0.10 cm^2}=2.2\cdot 10^{-3} \Omega[/tex]
In a longitudinal wave, particle displacement is
perpendicular to the direction of wave motion
parallel to the direction of wave motion
opposite to the direction of wave motion
above the direction of wave motion
In a longitudinal wave, particle displacement is parallel to the direction of wave motion.
(In a transverse wave, particle displacement is perpendicular to the direction of wave motion .)
Answer:
it is B
Explanation:
A ritualistic practice of clearing the mind in order to achieve relaxation and inner peace is known as ___________.
A.
hypnosis
B.
meditation
C.
sleep
D.
focus
Meditation is your answer
B. Meditation is correct
A trip is taken that passes through the following points in order
A(0m)
B(15m)
C(-30m)
D(-20m)
E(10m)
F(5m)
What is the distance from point B to point E
The distance from point B to point E is the sum of the absolute values of the differences in their positions, resulting in a total distance traveled of 65 meters.
The question is asking for the distance from point B to point E. Given the points A(0m), B(15m), C(-30m), D(-20m), and E(10m), we are interested in the segment from B to E. The distance traveled from B to E includes the change from B to D followed by the change from D to E. Specifically, the distance from B to D is the absolute value of the difference between their positions, which is |15 - (-20)| = 35 meters. Then from D to E, the distance is |(-20) - 10| = 30 meters. Therefore, the total distance traveled from point B to point E is 35 meters + 30 meters = 65 meters.
In your mouth the food mixes with saliva and is mechanically broken into smaller pieces this is called
digestion is what you call it
did it help
Answer:
wouldnt it be chewing or breaking down the food because digesting would be more after you swallow the food and it said in your mouth
Explanation:
Which statements describe the use of gamma rays to treat cancer? Check all that apply.
Gamma rays have low energy and a source must be placed in the body.
Gamma rays are absorbed by only the cancer cells.
High-energy gamma rays are directed at a tumor from outside of the body.
Gamma rays kill cancer cells in a tumor.
Gamma rays are applied to a large area of the body.
Answer:
3, 4
Explanation:
High energy gamma rays are directed at a tumor from outside the body & gamma rays kill cancer cells in a tumor on edge.
Gamma rays are used in cancer treatment to kill cancer cells by damaging their DNA.
Explanation:The use of gamma rays in cancer treatment involves the application of high-energy gamma rays to kill cancer cells. Gamma rays have characteristics similar to X-rays and are more penetrating and damaging to living tissue. In radiation therapy, high-energy radiation is used to damage the DNA of cancer cells, preventing them from dividing or killing them. This therapy can be delivered externally using a machine outside the body or internally using a radioactive substance. However, gamma rays are not absorbed only by cancer cells and can also damage healthy cells.
a truck moving 11.0 m/s makes a head-on inelastic collision with a stationary 1290 kg car. After, they move 8.75 m/s. what is the mass of the truck ?
Answer:
5017 kg
Explanation:
Since it is an inelastic collision, the truck and the car move together after the collision. The law of conservation of momentum states that the total momentum before and after the collision is conserved:
[tex]M u_t + m u_c = (M+m)v[/tex]
where
M is the mass of the truck
[tex]u_t = 11.0 m/s[/tex] is the velocity of the truck before the collision
m = 1290 kg is the mass of the car
[tex]u_c = 0[/tex] is the initial velocity of the car (stationary, so u=0)
v = 8.75 m/s is the final speed of the truck+car after the collision
Solving the equation for M, we can find the mass of the truck:
[tex]M u_t = Mv + mv\\M(u_t-v)=mv\\M=\frac{mv}{u_t -v}=\frac{(1290 kg)(8.75 m/s)}{11.0 m/s-8.75 m/s}=5017 kg[/tex]
Answer:
5017
Explanation:
3. Suppose that an airplane flying 60 m/s, at a height of 300m, dropped a sack of flour (pere the effect
of air resistance). How far from the point of release would the sack have traveled when it stack the
ground?
The sack of flour would have traveled 468 meters from the point of release when it hits the ground, assuming no air resistance.
Explanation:The subject of your question is related to kinematic physics, particularly projectile motion. When the airplane drops the sack of flour, we need to separate the problem into vertical and horizontal components. The horizontal component is the initial speed of the airplane, which is 60 m/s, and the vertical component is influenced by gravity alone.
Before calculating how far from the point of release the sack would have traveled, we need to find the time it takes for the sack to hit the ground. Using the equation of motion for vertical motion (that is, ignoring air resistance) (h=1/2*gt², where h is the height, g is the acceleration due to gravity and t is time), we can find the time t. Substituting the given values, 300m = 1/2*9.8m/s²*t², we find that t is approximately 7.8 s.
The horizontal distance traveled by the sack is then obtained by multiplying the time t by the horizontal velocity of the airplane. That is, d = 60m/s * 7.8s = 468 m.
So, the sack of flour would have traveled 468 meters from the point of release when it hits the ground, assuming no air resistance.
Learn more about Projectile motion here:https://brainly.com/question/29545516
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Which of the following chemical reactions expressed correctly the role of the catalyst in the reaction?
Answer:
d
Explanation:
because i know
Answer:
Explanation:
D
A catalyst starts out with the reactants and winds up with the products. It does not take any part of the reaction. It just lowers the activation energy (usually) making it easier to get from the left side of the equation to the right side.
B is the second best answer, and had you not chosen B and gotten wrong, I think I would have agreed with you.