A student obtains two strips of magnesium, Mg, ribbon that are each 3 cm long. One strip of magnesium is placed in a test tube containing 5 mL of water, and the other strip is placed in a test tube containing 5 mL of hydrochloric acid, HCl. Both liquids are at room temperature. The student’s observations are recorded in the table.
Which statement is NOT supported by the student's observations?
Question 5 options:
A chemical reaction takes place between magnesium and hydrochloric acid.
A gas is released in Test Tube 2.
The substances in both test tubes are reactive only at high temperatures.
Energy is released in the reaction involving hydrochloric acid.
Answer:
The substances in both test tubes are reactive only at high temperatures.
Explanation:
Bubbling occurs in test tube 2, which is a sign of a chemical change. Hope this helps.
Answer:
C)The substances in both test tubes are reactive only at high temperatures.
Explanation:
I did the test.
In a balanced chemical equation,
A. atoms are conserved.
B. coefficients are equal.
C. molecules are equal.
D. energy is not conserved.
help pleaseee i will give brainliesttt
Answer:
The Answer is A
Explanation:
Please let me know if I am wrong
What is the relationship with Wave Medium
Answer:
medium: The material or empty space through which signals, waves or forces pass. direction of propagation: The axis along which the wave travels. wave: A moving disturbance in the energy level of a field.
Which evidence is an indication that a chemical reaction has occurred?
A)formation of a gas
B)melting of a substance
C)boiling of a substance
D)freezing of a substance
The chemical formula for hydrogen peroxide is H2O2. What is the total number of atoms in 1 molecule of hydrogen peroxide?
Answer:
THE TOTAL NUMBER OF ATOMS IN 1 MOLECULE OF HYDROGEN PEROXIDE ARE 4 ATOMS.Explanation: 1 molecule of hydrogen peroxide contains 2 hydrogen atoms and 2 oxygen atoms.I HOPE THAT THIS ANSWER HELPS YOUThe chemical formula for hydrogen peroxide is H₂O₂. The total number of atoms in 1 molecule of hydrogen peroxide is four atoms. Two atoms of hydrogen and two atoms of oxygen.
What is hydrogen peroxide ?Chemically, hydrogen peroxide has the formula H₂O₂. It is a somewhat more viscous liquid than water, and very pale blue when it is pure. For consumer use, it is typically diluted in water and used as an oxidant, bleaching agent, and antiseptic. For industrial use, larger concentrations are utilized.
Hair bleaching, surface cleaning, and tool disinfection are all done using hydrogen peroxide. It is also utilized in gardening and dental hygiene.
Two hydrogen and two oxygen atoms make up one molecule of H₂O₂. Therefore, two molecules of H2O2 contain four hydrogen and four oxygen atoms each. Two hydrogen atoms and one oxygen atom make up a water molecule.
Thus, The total number of atoms in 1 molecule of hydrogen peroxide is four atoms.
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What is convection?
a Transfer of heat through objects touching the source
b Transfer of heat through direct physical contact
c Transfer of heat through electromagnetic waves
d Transfer of heat through the movement of particles
What is this natural process of particles (gases, liquids, and solids – when melted) going from a higher concentration to a lower concentration?
Answer:
This is by diffusion.
Explanation:
The slideshow describes what happens. Diffusion in liquids is slower than diffusion in gases because the particles in a liquid move more slowly. It happens faster if the temperature is increased
✎11. How does changing the Amplitude affect the wavelength?
Brainstorm as many causes as you can for the phenomenon that waves seem to change direction as they approach the shore.
Answer:
As a wave moves into shallow water, its orbitals “feel the bottom,” causing it to slow down. you will see a sea of red tail lights in front of you: the cars in front of you are all Why does the wavelength of waves change as they approach a beach direction, so at any given spot in the ocean, waves are typically coming from
Explanation:
I hope I help :)
general properties shared by all waves.
Answer:
All kinds of waves have the same fundamental properties of reflection, refraction, diffraction and interference, and all waves have a wavelength, frequency, speed and amplitude.
A cube has a mass of 9 grams and each side is 3 cm3. What is the density of the sample?
a.0.33 g/mL
b.36g/mL
c.3g/mLd.18g/mL
Im begging someone to help, Ill mark brainlist!!!
Answer:
a. 0.33 g/mL
Explanation:
We already know what the mass is (9 grams) so we have to find the volume of the cube next.
Volume = lwh
=(3)(3(3)
= 27
To find density, you have to find mass/volume
density = mass /volume
density = 9 g /27 mL (cm 3 and mL are basically the same thing)
= 0.33 g/mL
Where is one example of where a Volcanic Neck exists on earth
Answer:
Puerto rico and Cabezon Peak
Explanation:
sixty percent of all active volcanoes occur at the boundaries between tectonic plates. Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean. Some volcanoes, like those that form the Hawaiian Islands, occur in the interior of plates at areas called “hot spots.”
Hope this helped!
The amplitude of a wave is related to the energy of a wave. How could you demonstrate this relationship between energy and wave
Answer:
People holding the slinky supply the energy to make the patterns. To make pattern 1, people have to shake the slinky back and forth at a certain speed. To make pattern 2, the slinky has to be moved back and forth faster (higher frequency). To make pattern 4, the people need to move the slinky back and forth much faster. It is much easier to make pattern 1 than pattern 4 because it takes less energy. This illustrates the relationship between frequency and energy – the higher the frequency, the higher the energy.
Explanation:
A GFCI is an example of what kind of electrical safety device?
A.a frayed cord
B.a lightning rod
C.a parallel circuit
D.a circuit breaker
Answer:
Circuit breaker.
Explanation:
Which is one factor of rock types that affects the rate of weathering?
porosity
moisture
temperature
mineral color
Answer:
B
Explanation:
got it right on edge
Answer:
Its A porosity
Explanation:
When complete, the lab report should be read as a coherent whole. Make sure you connect different pieces with relevant transitions. Review for proper grammar, spelling, punctuation, formatting, and other conventions of organization and good writing.
Answer: you need to specificlly write down what you did for your lab report and do what all of thet stuff says to do
Explanation:
Answer:
So I went threw the student guide and read it carefully. Then I went threw the walk threw with the teacher and the step by step guide to get the lab done. when did multiple test an example is the height of the track and we did multiple times on that height to see it the results where same or had little difference. As I went threw it I recorded the data because I was asked to. then i filled out the questions for the lab!
Explanation:
just did it hope it helps future people
Pls help me I don’t understand it’s for my science class.
Plz check if correct and tell me wether each is element or compound
Answer:
sureeee
Explanation:
Draw a wave with a wavelength of six units
Answer:
There ya gooo.
Explanation:
Answer:
Explanation:
How am I supposed to draw something in text? Oh, I know! _/\_/\_/\_/\_/\_/\_
Electromagnetic waves do not need to carry blank. Electromagnetic waves carry enough through matter, but they also carry enough energy through empty blank in a vacuum.
Answer: what? whats the quiestion?
Explanation:
=:)
☆
Is mass conserved when 10 g of sodium hydroxide undergoes a chemical change during an interaction with 57 g of copper sulfate? Use complete sentences to support your answer by explaining how this can be demonstrated.
☆
please use complete sentences for the answer/an explanation, i'm confused on this questionn v( ‘.’ )v ...
Answer:Instead of “theory” scientists use the word hypothesis to describe a possible explanation for a scientific mystery. Theories in science are hypotheses that.
Explanation:
Hi, Im new! But, why is physical and chemical changes are different?
Answer:
Physical and chemical changes are different because one deals with changes to ones shape or form, while chemical is changing one substance to another.
Explanation:
A example of a physical change would be cutting a block of wood into a cube of would, its physical change changes from a block to a cube. A chemical change is changing the substance into another substance so for example, burning that cube of wood in a fire. The fire is burning the wood into ash meaning it's no longer wood but ash.
Hope this helps.
What is a real world application of understanding the difference between prokaryotic cells and eukaryotic cells?
Being able to identify them with your naked eye
Differentiating between animal and human cells.
Understanding the treatments casued by different infections.
Being able to identify bacterias habitat.
Answer:
FIRST ONE
Explanation:
What is the affect of this
A wave enters a new medium at an angle far from 90 degrees with the boundary between the two media.
Answer:
Explanation:
Your answer should be in the attached pdf
1. If the frequency of a wave increases from 2 Hz to 4 Hz without the wavelength changing, how will the wave speed change? PLS HELP!!!! WILL MARK BRAINLIST!!!!!!!
Answer:
biraz naruto izle
Explanation:
1. compare and differentiate weathering and erosion 2. give one example of weathering and one example of erosion that we may observe in our environment every day .
Answer:
1.weathering is the action were a rock starts breaking off or worn out erosion is by natural causes like wind.
2. weathering if your every near a cliff or a mountain you might see rocks falling of
erosion would be if you ever come by a rock a plant my grow inside of it and start breaking
Explanation:
i might have gotten #2 mixed up with weathering and erosion but you could see more answers
1. Express the wave speed of each wave described below in meters per second.
A wave travels through a 2 meter rope in 1 second.
Answer:
In this instance, the sound wave travels 340 meters in 1 second, so the speed of the wave is 340 m/s. Remember, when there is a reflection, the wave doubles its distance. In other words, the distance traveled by the sound wave in 1 second is equivalent to the 170 meters down to the canyon wall plus the 170 meters back from the canyon wall.
Explanation:
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, in below given ways, speed of each wave can be expressed.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
The sound wave moves 340 meters in one second, hence its speed is 340 m/s. In the event of a reflection, the wave's distance doubles. The distance covered by sound wave in one second is comparable to 170 metres down to a canyon wall + 170 meters back.
Therefore, in above given ways, speed of each wave can be expressed.
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Choose the nonrenewable energy sources below.
Answer:
Coal, fossil fuels, electricity
Explanation:
Whats the effect of this?
A wave enters a medium where its wave speed is slower.
Answer:
Wave speed, frequency and wavelength in refraction
Although the wave slows down, its frequency remains the same, due to the fact that its wavelength is shorter. When waves travel from one medium to another the frequency never changes. As waves travel into the denser medium, they slow down and wavelength decreases.
Explanation:
havvee advvanncceed
Answer:
Waves. Refraction is an effect that occurs when a light wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light. Light is refracted when it crosses the interface from air into glass in which it moves more slowly.
Hypothesize! What type of substance do you think Coffee is? Why?
Answer:
Liquid???? I'm confused on what you are asking it has caffine?
Explanation:
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What is the effect on this???
A wave is transmitted into a medium where it moves faster, and then back into a medium where it moves slower again.
