Answer:
Seeing a gas produced not always means a chemical reaction is occurring.
Explanation:
The following clues for an occurrence of a chemical reaction:
Color: The color of the solution changes when mixed with another solution or on the addition of a solid to a solution.Temperature: Rise or fall in temperature of the substance formedPrecipitation: Formation of solid substance that is precipitateGas evolution: Bubbles or gas formation. Evolution of gas or fumes from the solution.Odor: The smell of the reacting mixture initially differs from the smell of the productsYes, gas formation is one of the clues of the occurrence of a chemical reaction but it is not completely true.
This is because the evolution of gas also occurs when a substance undergoes a physical change.Water vapors on boiling water, sublimation of dry ice giving carbon dioxide gas.So, from this, we can conclude that seeing a gas produced not always means a chemical reaction is occurring.
Learn more about observations of chemical reactions here:
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Shells can also be called (choose all that apply)...
Question 4 options:
circles
energy levels
rings
spheres
Answer: Electrons or Energy Levels
Explanation: Electrons are found in areas called shells. A shell is sometimes called an energy level.
What are two ways to practice conservation? How would your proposals help?
Answer:
Check your toilet for leaks. ...
Stop using your toilet as an ashtray or wastebasket. ...
Put a plastic bottle in your toilet tank. ...
Take shorter showers. ...
Install water-saving shower heads or flow restrictors. ...
Take baths. ...
Turn off the water while brushing your teeth. ...
Turn off the water while shaving.
Which statement describes how natural gas is made and its environmental impact? A. Natural gas is made from fertilizer. Using it causes water pollution. B. Natural gas is made from rocks and minerals. Using it causes erosion. C. Natural gas is made from nuclear reactions. Using it produces hazardous waste. D. Natural gas is made from the remains of prehistoric organisms. Using it produces air pollution
Answer:
Im not so sure but I believe the answer is D. Natural gas is made from the remains of prehistoric organisms. Using it produces air pollution
Explanation:
If right can I get brainliest?
Which of the following is NOT a gland?
A. Pancreas
B. Neuron
C. Thyroid
D. Pituitary
help please!
Plsss help!! What would happen to a cup of hot coffee left untouched for 10 minutes. Include in your response temperature, molecules, and kinetic energy.
Answer:
The overall temperature of the coffee would decrease because the coffee would transfer its thermal energy into the surrounding air. The molecules would slow down in movement because when the coffee was hot, they were moving around faster. Subsequently, the kinetic energy of those molecules would also decrease
Explanation:
Answer:
the temperature would become cooler
Explanation:
Which change of state is shown in the model?
A. Condensation
B. Boiling
C. Sublimination
D. Freezing
Answer:
D
Explanation:
What is the role of the nervous system in the body? *
A. to protect other organs and tissues
B. to send messages using chemicals
C. to gather and respond to information
D. to transport oxygen and carbon dioxide
be quick plz!!
Answer:
I think its A
Explanation:
its the only one that makes sense
Answer
B: to send messages using chemicals
What happens to chemical bonds during a chemical reaction?
the bonds that keep the molecules together break apart and form new bonds during chemical reactions.
Valence electrons will either ______________ or ______________ to form molecules.
Answer:
ionic or covalent
Explanation:
The outermost electrons -- the valence electrons -- are able to interact with other atoms, and, depending on how those electrons interact with other the atoms, either an ionic or covalent bond is formed, and the atoms fuse together to form a molecule.
Which of the following describes an energy transformation from chemical to electrical to light energy?
a
A bolt of lighting flashes during a storm
b
A flashlight uses a battery to operate
c
A candle glows as it burns
d
A wind turbine produces power for ligh
An energy transformation from chemical to electrical to light energy is that a flashlight uses a battery to operate and the correct option is option B.
What is transformation of energy?An energy transformation is the change of energy from one form to another.
Energy transformations occur everywhere every second of the day. There are many different forms of energy such as electrical, thermal, nuclear, mechanical, electromagnetic, sound, and chemical.
The Law of Conservation of Energy states that energy can neither be created nor destroyed.
Therefore, An energy transformation from chemical to electrical to light energy is that a flashlight uses a battery to operate and the correct option is option B.
Learn more about Transformation of Energy, here:
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Where do flowers come from? They are made through the process of sexual reproduction. Flowers may look simple, but there are actually several parts that allow it to reproduce. Let's take a closer look. Glad my mom didnt make me read this out loud- THIS WAS IN MY FREAKING SCHOOL WORK IM NOT LYING LIKE LOL
Answer:
They're sexual reproduction
Explanation:
A flower throws seed at another flower
Conner boils water on the electric stove. The electrical energy is transferred to the thermal energy of the stove. This demonstrates which of the following?
a
Energy is created and then destroyed
b
Every system produces more energy than goes into it
c
Energy can change from one form to another
d
Electrical energy can only produce heat energy
Answer:
The answer is C
Explanation:
Also I love your Bakugou pfp ;D
Answer:
c
Explanation:
because I think it makes the most sense
Please hurry I need to get this done, Please help me I will give you the brain thing and extra points.
image below 7
Answer: I believe the answer is D
Explanation:
This equation shows the neutralization of sodium hydroxide and hydrochloric acid:
NaOH + HCl → H2O + NaCl
The reactant side of the chemical equation has (1/2/3/4) atom(s) each of sodium, oxygen, and chlorine. The reactant side also has (1/2/3/4) hydrogen atom(s). Count the numbers and kinds of atoms on the product side of the equation. The numbers and kinds of atoms on both sides of the chemical equation are (the same/not the same). So, this chemical equation is (balanced/not balanced) .
Answer:
The reactant side of the chemical equation has
1
atom(s) each of sodium, oxygen, and chlorine. The reactant side also has
2
hydrogen atom(s). Count the numbers and kinds of atoms on the product side of the equation. The numbers and kinds of atoms on both sides of the chemical equation are
the same
. So, this chemical equation is
balanced
.
Explanation:
A SERIES CIRCUIT is a closed circuit with one path.
a. True
b. False
Is the size of the country an important factor in how much helium that can be found there?
Brainless pls
Explanation:
Accordingly, any attempt to determine where the helium market will be more than a few years ... and/or recover helium can reduce the amount of helium consumed by as much as a factor ...
Answer:
Explanation:
Accordingly, any attempt to determine where the helium market will be more than a few years ... and/or recover helium can reduce the amount of helium consumed by as much as a factor..
I need help unscrambling and answering these. The underlined letter is what starts the word. Once they are unscrambled match them to the correct thing they are. Example: Zoologist= Animals.
Answer: Zoologist (like you said) Geologist, and Chemist, Biologist, Seismologist.
Zoologist
Geologist
Chemist
Biologist
Seismolgist
lol help fill the blanks
When energy is transformed from one form to another, what kind of energy is always produced?
Answer:
Energy transformation is when energy changes from one type to another. While energy can be transferred or transformed, the total energy always remains the same.
Explanation:
need help asap
will give brainly
Answer:
8. B
9. D
10. A
Explanation:
give brainliest pls ^-^
Algal blooms which pollute streams, rivers, and lakes are caused by the presence of O A. lead. O B. oxygen. C. mercury. D. phosphates. O E. E. DDT.
Answer: oxygen
Explanation:
can anybody define hypothesis in their own words? (its for school)
Answer:
An educated guess based on what you already know.
Explanation:
What are the forms of light energy in solar radiation and the colors in white light?
(it has to be atleast 2 sentences)
Answer:
Light is a kind of energy called electromagnetic radiation. There are many different forms of electromagnetic radiation, such as radio waves, microwaves, ultraviolet rays, and X-rays. Each form is characterized by a different wavelength. For example, radio waves can be several miles long, while gamma rays are smaller than atoms. The light that we see — visible light — falls somewhere in the middle of this "electromagnetic spectrum.
The distance from the crest of one wave to the crest of the next wave.
A. microwaves
B. longitudinal
C. wavelength
D. electromagnetic
E. gamma rays
F. mechanical
Answer:
C
Explanation:
Answer:
c
Explanation:
what processes break down and build up Earth's surfaces?
When Kristen was five, she became sick with chickenpox and then recovered. What claim explains why Kristen is unlikely to get chickenpox a second time? *
A. Kristen has developed a vaccine against chickenpox.
B. Kristen has not developed antibodies to chickenpox.
C. Kristen’s body no longer contains cells that can be damaged by chickenpox.
D. Kristen’s body has memory cells that will produce antibodies to fight chickenpox.
be quick plz!!
Answer:
the answer is A!
Mark as brainless
If your reactants are equal to our products in our chemical equation, then the arrow should always be pointing towards the?
Does the Caribbean have high or low viscosity lava?
Early man discovered it and used it with wood. When I use it on this thing it smells so very good.
Answer:
Fire was found by early man and used with wood, and it is used on a candle to smell good.
The answer to the riddle you provided is "fire." Early humans discovered fire and used it in conjunction with wood for various purposes, such as cooking, and providing warmth, and protection. When you use fire on something, it often produces a pleasant aroma or smell.
The picture shows the Prairie blazing star, a flowering plant found in a prairie environment.
How does the body plan of the Prairie blazing star help it carry out its life processes?
A.
Being in groups helps it to attract pollinators, and the roots touching each other allow the plants to share nutrients.
B.
The narrow leaves help it to attract herbivores to carry seeds, and the roots fan out to find water of a large surface area.
C.
The height of the plant allows it to receive direct sunlight, and the flowers prevent herbivores from trying to eat it.
D.
The deep roots allow it to find water in a usually dry environment, and the narrow leaves help prevent water loss through evaporation.
Answer:
A
Explanation: hope this helps
