Chemistry Middle School

Based off of the simulation pulley gizmo; how many people did it take to lift the armchair with a fixed pulley? (Look at Activity A question 2)



Question 5 options:

1


3


4


5

Based Off Of The Simulation Pulley Gizmo; How Many People Did It Take To Lift The Armchair With A Fixed

Answers

Answer 1

Answer:

IN WHICH GRADE YOU ARE????

Related Questions

____________ limits or stops the growth of bacteria.


Antibiotics
Antibiotics

Chemicals
Chemicals

Photosynthesis
Photosynthesis

Vaccines

Answers

Answer:

Vaccines

Explanation:

ANSWER: Vaccine


Explanation: I had this question and got it right

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

Answers

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.

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.

Answers

Answer:

The answer is C

Explanation:

C Is the right answer

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.

Answers

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

A submarine fills a special storage area known as ballast with water in order to increase its density. This allows it to dive deeper into 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?

Answers

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.

Happy Hollidays!!  :)

Plz, help! I need help with questions a and b! Plz, write your answer in complete sentences! And the first person to answer will get a brainliest! Plz, NO SCAM links!!! Need help ASAP!!!!!

Answers

A.
When the ball is coming in my direction, I hit the ball which changes its motion. If I had not done that, the ball would have kept on going until another force acted on it.

B.
The weight of the bowling ball and its acceleration increases its force, which allows for it to knock over the bowling pins with ease. Had I thrown lighter, its force would decrease.

True or false? Tornadoes can form when the air in a strong thunderstorm or a supercell begins to rotate.

Answers

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

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?

Answers

gravitational gradient fields add together constructively, leading to extra strong tides (high tide is extra high and low tide is extra low). This alignment happens when the moon is a new moon or a full moon, which occurs about every two weeks.
I mean I don’t really know scientifically, but if you think about it rationally, you can impose that the gravitational force can affect certain tides depending on the relativity. So if the earth is on its far orbit, furthest away from the sun, maybe the tide could change due to a weaker gravitational force. Although I am unsure.

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!!!!

Answers

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.

State your claim. Make sure your claim fully explains how you can distinguish between materials that appear similar. HELPPPPPP MEEEEE PLZZZZZZZZ!!!!!!!!!!!!!!!!!!!!!

Answers

The material on the right is a darker shade than the one on the left. Also the one on the right also is less of a block and a little more shagged
The right one is darker than the left

List the communities in a successional sequence of secondary succession?

Answers

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.

⚡❤️

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.

Answers

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!

What are the evidences for suspecting the presence of waves?

Answers

Answer:

Well,

Conducting rods are good for detecting oscillating electric fields and conducting loops are good for detecting the presence of radio waves.  

why does a cold front cause intense weather

Answers

There are several severe weather events that occur due to cold fronts. The reason being is because winds will move towards each other along the front. The angle of a cold front is also greater than that of the other types of fronts, which creates more lift in the atmosphere vertically
A cold front causes intense weather because winds will move towards each other along the front

Please help me with this

Answers

The answer is vinegar and soda

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

Answers

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:

I NEED HELP ASAP PLZZZZ

Answers

how to help ya… maybe 2

Answer: 2 :)

Explanation:

I took the test

Think about the ecosystem that you live in.
Write a response below describing it in complete sentences.
4)
Use each of these terms correctly in your description:
• community
• ecosystem
• biotic
• population
• individual
• abiotic

Answers

Answer:

this is an answer for YOU to answer. this is about YOUR ecosystem

Explanation:

just say what it's like, is it a community? is it populated? explain.

Through all the food chain, food web, chemical cycles, etc., biotic and abiotic forces interact within an ecosystem. Therefore, the functional and structural unit of nature is the ecosystem.

What is ecosystem?

The functional and structural unit of nature is the ecosystem.  This relationship between living and nonliving elements is handled by the ecosystem. All living things, including plants, animals, and microorganisms, rely on non-living substances to survive and keep the natural world in balance.

Individual, population and community play important role in running a ecosystem. Terrestrial Ecology: A terrestrial ecosystem is an ecosystem that is found on land. Grassland, desert, and tundra ecosystems, for instance.

Therefore, the functional and structural unit of nature is the ecosystem.

To know more about ecosystem, here:

https://brainly.com/question/19267717

#SPJ2

HELP ME PLEASE!!! ASAP

Answers

it's c I believe

Explanation:

I believe

Answer: chromium and carbon monoxide

Explanation:

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

Answers

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.

GIVING 40 POINTS PLZ HELP!!!!!!!!

Answers

Answer:

to find heart rate put 2 fingers on your wrist or neck also what one do you need help with

Explanation:

To find heart rate put 2 fingers on you wrist or neck

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.

Answers

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

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!

Answers

Answer: the opposite of the direction of motion

Explanation:

Answer: friction is acts in a direction opposite to the motion of the object.

It takes Mark two hours to ride his bike 12 miles to his grandma’s house. What is Mark’s speed in miles per hour? I need an answer asap! And you also have to show your work so plz do that!
First one to answer will get a brainliest

Answers

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.

Distance divided by time
So 12/2 So he would be going 6mph

How are seatbelts related to inertia? Write you answer in complete sentences.
I need answer asap!!!

Answers

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.

Exactly what she said ^^^^^^

Which of these items is a substance that is made from two or more different elements?

A. Element

B. Mixture

C. Oxygen

D. Compound

Answers

A compound which is D

Answer:

b mixture

Explanation:

if you mix two or more things makes a mixture

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!!

Answers

Answer:

3    can i have brainliest?

Explanation:

3. Pulls objects towards the Earth

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!!!!!!

Answers

Answer:

A. buoyant force.

Explanation:

It is like a buoy, but it is force pushing an object while in water.

hope this helped.

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.

Answers

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

Answers

Oxidation: a chemical change resulting form a reaction with oxygen
Endothermic:a reaction that takes in energy
Exothermic: a reaction that releases energy
Decomposition:chemical change whereby a molecule breaks down into simpler moles clues or elements
Subscript:written underneath or below
4.subscript
5. Oxidation
2. Endothermic
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