Answer:
Mark has a speed of 6 MPS (Miles Per Hour)
Explanation:
It took mark 2 hours to ride his bike to his grandma's house, which was 12 miles away. I divided 2 by 12 and got 6. Remember this: mph = miles away ÷ time.
In class we made salt crystals. To do this we put a supersaturated solution of salt into a glass of water. After a few days the water evaporated and the salt crystals were left on the paper cutouts. When the salt dissolved in the water was this a physical change or a chemical reaction? Please explain your answer in detail.
Answer:
Dissolving a solid in liquid, such as table salt in water, is a physical change.
Explanation: Its a physical change because only the state of the matter has changed
Which of the following always changes when a substance undergoes a chemical change?
A. State of matter of the substance.
B. Arrangement of the atoms composing the substance.
C. Color of the substance.
D. Mass of the substance.
Answer:
A. State of matter of the substance.
Explanation:
During a chemical change, the composition of matter always changes.
Answer:
I would say C.
Explanation:
My best bet is C but in all honesty, i have no clue. -hope my non-helping helped :D
How does gravity act on an object?
1. exerts force upward on an object
2. repels objects
3. pulls objects towards the Earth
4. restores an object to its original position
Need answer asap!! First one to answer will get a brainliest!!
Answer:
3 can i have brainliest?
Explanation:
I NEED HELP ASAP PLZZZZ
Answer: 2 :)
Explanation:
I took the test
True or false? Tornadoes can form when the air in a strong thunderstorm or a supercell begins to rotate.
Answer:
true
Explanation:
tornadoes can dogs when they are in the air which then form strong thunderstorms
Answer:
it's true ..
Explanation:
they r caused by weather conditions
Martin slowly pours an unknown liquid into a container that originally had some water in it. He is measuring the temperature in the container as he does this.
The temperature in the container rises very fast.
What kind of change is likely to be happening in the container?
A. A physical change.
B. A chemical change.
C. Neither a chemical nor a physical change, only a temperature change.
D. No evidence of any type of change.
Answer:
B
Explanation:
temperature is a characteristic of a chemical change
Plz help! Please write your answer in complete sentences and write a proper answer!
FIrst on to answer will get a brainliest!!! Thx!
Answer:
When launching a rocket in space, the rocket's fuel starts burning and is pushed downward in the form of a gas. Due to which an external force is generated on the rocket in an upward direction which is a reaction of the force of burning fuel gas.
Which of these items is a substance that is made from two or more different elements?
A. Element
B. Mixture
C. Oxygen
D. Compound
Answer:
b mixture
Explanation:
if you mix two or more things makes a mixture
Choose a property of matter and research how this property affects the way matter interacts with the world around it. Find out how the property is useful in nature or how humans make use of it.
What does this property describe?
How does the property differ between different types of matter?
Is this property used in any technology or by nature in any way?
Record your research.
NEED HELP RIGHT NOW!!!!
Answer:
Liquid foundation is a property it describes solutions, volume. weight is a property from the monocules in lighter than air. which is a natural way to simplify systematic independence. for science. Onced liquid forms a mass of ascetain size it would be used for more technology. Differences in property which are properties: oxegenation. temeratures, measurements. maybe to form independant examples.
A submarine fills a special storage area known as a ballast with water in order to increase its density. This allows it to dive deeper in the ocean. When a submarine needs to rise rapidly, compressed air is used to push the water out of the ballast. What effect does replacing the water in the ballast with air have on the submarine?
Answer:
the submarine floats after replacing the water with the compressed air
Answer:
The submarine will rise.
Explanation:
To get a submarine to surface, the main vents in the top of the tank are closed and high-pressure compressed air is blown into the ballast tanks, forcing the water out through the flood ports at the bottom of the tank. This increases the vessel's displacement.
Mixing baking soda and vinegar is an example of an endothermic reaction. This means...
A. baking soda and vinegar are products in this reaction.
B. energy is taken in during the chemical reaction.
C. energy is released during the chemical reaction.
D. there is no change in energy during the chemical reaction.
Answer:
The answer is C
Explanation:
PLS I REALLY NEED HELP
If the relative positions of the sun and moon affect the ocean’s tides, why would it be helpful for sailors and other people who work on the ocean to understand patterns in the Earth-sun- moon system?
The Statue of Liberty is made of copper metal. Copper metal has the physical property of being orange in color. Over years of being exposed to moist air, the surface of the statue has begun to form a green coating. Is the green coating the product of a physical or chemical change? Explain how the green layer is formed.
Answer:
The statue is made of a metal called copper. Over time, the copper has gone through a chemical change. This is called a chemical reaction.
Explanation:
i dont think this will help...
Answer:
Chemical.
Explanation:
Pretty sure its chemical, due to it oxidising which is a chemical reaction.
A gate made of painted iron is beginning to rust in areas where the paint has worn away. The paint served as a protective barrier between the iron and the oxygen in the air.
Why is the formation of rust considered a chemical process
A. Rust and iron are completely different substances with different properties.
B. Rust is just a different state of matter than iron.
C. Rust is a different color than iron.
D. Rust has the same arrangement and types of atoms as pure iron.
Answer:
I would say A
Explanation:
when rust forms it is a completely different substance and a chemical change is when a new substance forms, hope this helps!
List the communities in a successional sequence of secondary succession?
The given communities can be ordered in the secondary succession as grass, shrubs, small trees and large tress.
What is secondary succession ?The life cycle of a plant is characterized by secondary ecological succession. Secondary succession, in contrast to primary succession, is a process initiated by an occurrence such as a forest fire, harvesting, hurricane, etc. that reduces an already established ecosystem (such as a forest or a wheat field to a smaller population of species.
As a result, secondary succession occurs on preexisting soil, whereas primary succession typically takes place in a location lacking soil. Many elements, including trophic interaction, starting composition, and competition, might influence secondary succession. Trade-off with colonization
Therefore, the given communities can be ordered from the small level to higher level as grass, shrubs, small trees and large tress.
Find more on secondary succession:
https://brainly.com/question/26675203
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Your question is incomplete. But your complete question is as follows:
List the given communities in a successional sequence of secondary succession? shrubs, small trees, grass, large tress.
HELP ME PLEASE!!! ASAP
it's c I believe
Explanation:
I believe
Answer: chromium and carbon monoxide
Explanation:
List the communities in a successional sequence of secondary succession?
A stable deciduous forest community.
A disturbance, such as a fire, starts.
The fire destroys the vegetation.
The fire leaves behind empty, but not destroyed soil.
Grasses and other herbaceous plants grow back first.
Small bushes and trees begin to colonize the public area.
⚡❤️
What is the name of the tide when the sun, moon, and earth are all aligned, causing the greatest pull for highest and lowest tides?
Question 10 options:
Low tide
Spring tide
High tide
Neap tide
Answer:
spring tide
Explanation:
When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides — both commonly called spring tide
Answer:
Whenever the earth, moon and sun are aligned, the gravitational pull of the moon is augmented by the gravitational pull of the sun, causing larger than average tidal ranges — meaning especially high high tides and very low low tides. These extreme tides are called “spring tides.”
Explanation:
How are seatbelts related to inertia? Write you answer in complete sentences.
I need answer asap!!!
Answer:
Inertia- the tendency of an object to resist a change in velocity
Explanation:
Say a car was going at 65 MPH, but suddenly stopped. For all of the people in that car, their bodies would keep moving forward at 65 MPH until stopped by an equal force (say, the thing right in front of each person) The seatbelt is there to protect you from your own inertia.
State your claim. Make sure your claim fully explains how you can distinguish between materials that appear similar. HELPPPPPP MEEEEE PLZZZZZZZZ!!!!!!!!!!!!!!!!!!!!!
How does the Coriolis effect impact the Gulf Stream and the Brazil Current?
It turns the Gulf Stream southwest and the Brazil Current northeast.
It turns the Gulf Stream northwest and the Brazil Current northeast.
It turns the Gulf Stream northeast and the Brazil Current southwest.
It turns the Gulf Stream northeast and the Brazil Current northwest.
Answer:
Honestly, I think it is C.
Explanation:
Brazil is in the south, so that's why it is C.
hope this helped.
____________ limits or stops the growth of bacteria.
Antibiotics
Antibiotics
Chemicals
Chemicals
Photosynthesis
Photosynthesis
Vaccines
Answer:
Vaccines
Explanation:
I HAVE A D- IN SCIENCE PLEASE HELP
Complete the sentence.
In chemical reactions, a product is _________.
A. any substance that is to the left of the arrow
B. any substance that is made of the greatest number of atoms
C. any substance that is made from the least number of atoms
D. any substance to the right of the arrow
Answer:
D - Any substance to the right of the arrow.
Explanation:
A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
Which items are minerals or contain minerals? Check all that apply.
asap please:)
-lawn fertilizer
-topsoil
-a diamond necklace
-a copper electrical wire
-a cellular phone
Answer:
Hey dude....
Explanation:
This is ur answer.....
Check all because all of them contain minerals.....Hope it helps!
Brainliest pls!
Follow me! :)
Answer:
lawn fertilizer, topsoil, and a diamond necklace
Explanation:
lawn fertilizer and topsoil are coming out of the ground, therefore some amount of minerals will be in them, such as iron added to it to make whatever its going on grow stronger.
a diamond necklace is a jewel that is coming out of the ground. it is categorized as a raw mineral.
I'm not 100 percent sure about the copper wire and the cell phone.
I do belive copper is a mineral.
What type of force is known for exerting an upward force on objects in a fluid?
1. buoyant force
2. friction force
3. gravitational force
4. magnetic force
The First person to answer will get the brainliest!!!!!!
Answer:
A. buoyant force.
Explanation:
It is like a buoy, but it is force pushing an object while in water.
hope this helped.
What are the evidences for suspecting the presence of waves?
Answer:
Well,
Conducting rods are good for detecting oscillating electric fields and conducting loops are good for detecting the presence of radio waves.
Mixing baking soda and vinegar is an example of an endothermic reaction. This means...
A. baking soda and vinegar are products in this reaction.
B. energy is taken in during the chemical reaction.
C. energy is released during the chemical reaction.
D. there is no change in energy during the chemical reaction.
Answer: think a
Explanation:
PLZ HELP (SCIENCE) Match the following items.
1. a reaction that releases energy
decomposition
2. a reaction that takes in energy
endothermic
3. chemical change whereby a molecule breaks down into simpler molecules or elements
exothermic
4. written underneath or below
oxidation
5. a chemical change resulting from a reaction with oxygen
subscript
So im very confused!!! if you want to answer then plz read the instructions and plz give proper answer !!! Need help asap!!!!!!!!!!!!!!!!
In which direction does friction act?
1. in the same direction as the motion
2. at right angles with the motion
3. the opposite of the direction of motion
First one to answer will get a brainliest!
Answer: the opposite of the direction of motion
Explanation: