What can the student conclude about the experiments? (Attachment)
I WILL MAKE YOU BRAINLIEST
A. Experiments 1 and 2 show chemical changes because bubbles were produced.
B. Experiment 1 shows a physical change because no new substances were produced, and experiment 2 shows a chemical change because a new substance was produced.
C. Experiment 1 shows a chemical change because bubbles were produced, and experiment 2 shows a physical change because a liquid turned into a solid.
D. Experiments 1 and 2 show physical changes because no new substances were produced.
Answers
Answer: B. Experiment 1 shows a physical change because no new substances were produced, and experiment 2 shows a chemical change because a new substance was produced.
Explanation: a physical change is reversible
chemical is 2 or more substances combined to make a reaction such as bubbling, change of color or temperature
Related Questions
Heather is investigating the properties of light and how it travels. She places a glass on the windowsill and waits for the sun to shine on the glass and observes what happens. Next, she places a piece of cardboard in front of the glass. Which statement describes the results of her observations?
A Since glass is translucent, most of the light energy was reflected from the glass.
B When the cardboard was placed in front of it, the cardboard absorbed some of the light energy.
C The light from the sun was able to travel through the glass. When the cardboard was placed in front of the glass, it absorbed the light energy from the sun and converted it into heat energy.
D The glass absorbed the light and converted the light energy into heat energy. When the cardboard was placed in front of the glass, the heat was transferred from the glass to the cardboard.
When the sun hit the glass, the light energy was absorbed. When the cardboard was placed in front of the glass, it absorbed the light energy from the sun and converted it into heat energy.
Answers
Since glass is translucent meaning you can see through it, heat energy from the sun will easily pass through it. If you were to conduct this test with a piece of metal the heat would be absorbed by the metal making it extremely hot. In this instance when they put a piece of cardboard in front of the glass it would absorb the heat energy since it is not translucent.
Answer:
nope it is not c
Explanation:
What type of energy transformation is happening?
a boy sliding his foot across the floor
A Electrical energy is created by friction when his foot slides across the floor.
B The mechanical energy of his foot moving across the floor is transformed into chemical energy.
C When his foot is sliding across the floor, it creates heat energy through friction.
D When his foot rubs against the floor, the energy of motion changes into light energy.
Answers
Which option is an example of a physical change?
iron rusting
metal denting
silver tarnishing
gasoline burning
please hurry!!!!!
Brainliest if right!
Answers
Answer: metal denting
Explanation:
a physical change is something that can be undone. while chemical changes are relatively permanent. You can reshape the metal so you know it is physical.
Is light energy organic or inorganic?
If ATP is in the middle which word goes first? organic or inorganic
Answers
It is organic my friend, have a good day
Explanation:
.
Answer:
1. light energy is organic
2. If ATP is in the middle, the word that goes first is organic
Which of Newton's 3 Laws explains a rocket lifting off? *
Law of inertia
Law of Acceleration
Law of Action-Reaction
Answers
Answer:
Newton's Third Law of Motion
Explanation:
A rocket expels hot gases at a very high pressure very quickly, and these gases have lots of energy, and according to Newton's third law, every action has an equal and opposite reaction. So, expel lots of gas at a high rate, and the energy of the gases being pushed out propels the rocket upward. Hope that helps!
In two or more complete sentences explain how to balance the chemical equation,
Ca + N2 ⟶ Ca3 + N2 and include all steps.
Answers
Answer:
to balance this equation, your going to put a 2 in front of the "Ca" then that makes the equation look like this "2Ca + N2 ⟶ Ca3 + N2" since the "Ca" had one atom, we added two more atoms
as we all know 1 + 2 = 3
then that gives us 3 "Ca's" on both sides
hoped this help and good luck on your test! :D
Explanation:
What is a diaphragm? What does it do?
Answers
The diaphragm, located below the lungs, is the major muscle of respiration. It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges.
Explanation:
Diaphragm contracts and expands when you breathe air
Answer:
A diaphragm on a microscope is the piece that enables the user to adjust the amount of light that is focused under the specimen being observed. A diaphragm is typically found on higher-power microscopes versus less expensive or toy models. The diaphragm is located directly under the stage or platform where user places the specimen or slide.
Explanation:
Compound: _________________
. Found in air; contains carbon (C) and oxygen (O)
Answers
Answer:
Explanation:
Contian power
15 points and brainiest (if there's 2 answers)
Is the coloring of the peppered moths an example of competition, differential reproductive success, or inherited variation?
Please explain why
thank you
Answers
Explanation:
Because the coloring of the moths were a genetic mutation that helped strengthen the endurance and versatility of the moths by blending in with better environments
When using the absolute method to assess muscular endurance, you should adjust the weight according to each individual's strength ability.
Please select the best answer from the choices provided.
T
F
Answers
Jim ran 200 meters in 30.4 seconds. Mac ran 100 meters in 30.4 seconds. Who ran faster?
Jim, because his distance divided by time is less
Jim, because he ran a greater distance in the same time
Mac, because he ran the same distance in fewer seconds
Mac, because his rate of change of distance over time was constant
Answers
Jim, because he ran a greater distance in the same time :)
By the way, this is a maths question
Which statement is true about heat and light energy?
A Heat and light energy always move from colder objects to warmer ones.
B Heat energy moves in many different directions and light energy moves in only one direction.
C Objects do not produce both heat energy and light energy.
D Some objects can absorb both heat energy and light energy.
Answers
Answer:C
Explanation:
Answer:
D.
Explanation:
Got it right on my test, Trust me.
What is the curie used to measure?
a.amount of radiation equaling disintegrations per second
b.amount of radiation biological material absorbs
c.amount of gamma radiation needed to produce a specific number of positive or negative particles
d.amount of radiation needed to produce positive or negative particles due to gamma rays passing through one gram of air
Answers
Answer:
Explanation:
A
Write a statement that best compares the rotation of a gaseous planet (Jupiter, Saturn, Uranus, Neptune) to the rotation of a rocky planet (Mercury, Venus, Earth, Mars)?
Answers
Match the part of the wave to its description
Answers
Answer:
Crest Highest Point of the wave
Trough Lowest Point of the wave
Amplitude the height from mid point to the crest or trough
Wavelength Distance from one crest to another
The match of the wave is
Crest ⇒ Highest point of the wave.
Trough ⇒ Lowest point of the wave.
Amplitude ⇒ Height from mid point to the crest or trough
Wavelength ⇒ Distance from one crest to another.
What is wavelength?Wavelength the distance a wave travels in the time it takes a medium particle to complete one vibration. The letter k stands for it. The meter is its SI unit.
What is amplitude?
Amplitude can be referred to as the maximum displacement caused by the vibrating particle. A is the symbol for it. The meter is its SI unit.
To know more about wavelength click here.
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Help I need to know and please answer three of the following questions
Answers
Answer:
we'll, metal cups are usually used for coffee so people who bring their coffee to work from home can keep it warm. metal cups however do not keep things cold, it may feel cold on the outside, but that's an illusion. plastic doesn't do much, its just a cold insulator. it is good at keeping things cold because it is a poor heat conductor. foil can keep things warm, but it can also keep things cold. do what you will with the info lol.
Answer:
1.H & E
Explanation:
metal cups keep things hot and cup H is made to keep things both cold and hot but the other cups will melt if you put hot stuff in them and number three is an answer it your self because it says to enter your answer so........
²³√∛·×÷±≈≠≤≥≡≅⇒,⇔∈∉∧∨∞αβΔπФω↑↓∵∴↔→←⇵⇅⇄⇆∫∑⊂⊃⊆⊇⊄⊅∀°∠∡⊥∪∩∅¬⊕║∦∝∞㏒㏑
PLEASE HELP ME!!
What happens at the borders of major tectonic plates?
Radioactivity is very high and large amounts of uranium are found.
Earthquake and volcanic activity is evident.
The edges of plates break apart due to the crushing that occurs.
The borders are calm and free of plate movement activity.
Answers
Answer: continental crust is created and oceanic crust is destroyed.
Explanation:
Answer:
Radioactivity.
Use the terms carbon dioxide, nitrates, phosphates, sulfates, and water to complete the chart that describes the inorganic compounds that provide most of the main elements of life to plants.
Answers
Answer: hi imi i new
Explanation:
There are many sizes and colors of stars. Which of the following BEST describes the category in which the Sun would be placed?
Select one:
a. blue supergiant stars
b. red giant stars
c. yellow main sequence stars
d. white dwarf stars
Answers
Answer: The Sun is a yellow main sequence star
Explanation:
Select the substance or substances that are homogeneous mixtures
Question 22 options:
Solution
Compound
Colloid
Molecule
Suspension
Answers
Answer:
colloid, suspension, solution
How does the amount of water in a glass affect the pitch of the sound it produces?
Answers
Answer:
the more water the higher the pitch the less water the lower it is
Answer:
The glass with the most water has the lowest pitch. The glass with the least amount of water has the highest pitch.
Explanation:Tapping the glasses causes the air to vibrate. When the air column is shorter, the air vibrates faster and the pitch is higher.
When a log burns in a fire, a a physical change has occurred. b mass is gained. c new substances are formed.
Answers
Answer: technically it is chemical and physical change
Explanation: chemical bc it’s burning and physical bc it’s going from a log to ashes
Answer:
C! New substances are formed.
Explanation:
The burning log will release carbon dioxide, which is a new substance that was never there in the first place.
Match the terms
1.the total energy of any closed system, including all internal kinetic and potential energy of the system
2.a measure of the average kinetic energy of particles in an object
3.something that flows into a substance
Terms-
Temperature
Heat
Thermal Energy
Answers
Answer:
1-thermal energy, 2-tempurature, 3-heat
Explanation:
The correct match of the terms and their definitions are:
1. Thermal energy – the total energy of any closed system, including all internal kinetic and potential energy of the system.
2. Temperature – a measure of the average kinetic energy of particles in an object
3. Heat – something that flows into a substance
What is thermal energy?Thermal energy is the energy that is formed by heat. It is produced when the temperature of a body increases. This cause the molecules and atoms to run or move fast or collide with each other.
Heat is a form of energy that is produced when the temperature of a substance increases. Heat, thermal energy, and temperature are interconnected to each other.
When the temperature rises, the heat or thermal energy in the body increase, which cause the movement of atoms faster, and the atoms collide with each other.
Thus, the correct match is 1- thermal energy, 2- temperature, and 3- heat.
To learn more about thermal energy, refer to the link:
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Where is the DNA stored in a cell?
Answers
Answer: nucleus
Explanation:
How many atoms are in Al2(SO4)3
Answers
Answer:
here are two aluminum ions and three sulfate ions; or two aluminum, three sulfur, and twelve oxygen atoms.
What is Litmus Paper?
Answers
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Litmus is a natural dye which is extremely from lichens. it is the most commonly used indicator. Litmus is available in the form of blue and red litmus paper.
Use the images below to complete the information on the table and answer questions 1-5.
Answers
Answer:
Proton: Positive
Electron: Negative
Neutron: No charge
Electron negative
Neutron neutral
PLS HELP ME! por favor, ayúdame!
Answers
Convection is a process in which the heat from one part of a fluid ( which can either be a liquid or a gas ) moves to its other parts .
How many atoms doesCo(NO3)2 have
Answers
of 3 different elements that equal 9 atoms.
12 Points/Brainliest
Answers
Answer:
In fact, at the sea level, the the sea water boils at 100 degree C where atmospheric pressure is normal. However, the boiling takes place at a lower temperature at the top of a mountain due to low pressure. In other words the boiling is faster at the top of a mountain than that at its foot.
Explanation:
Hope this helped you :)