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

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Answer 1

Answer:

IN WHICH GRADE YOU ARE????

Related Questions

6 CO₂ + 6 H₂0 → C₆H₁₂O₆ + 6 O₂

A. 6 CO₂

B. →

C. 6 H₂0

B. C₆H₁₂O₆

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Huh I don’t understand but I think c or d
The answer for your question and C

Is gravity alone sufficient to explain the behavior of the tinsel in the Levitating-orb system? Explain why.

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Answer:

The object is moving forward

Explanation:

Hop this helps :)

Answer: The orb is attracted to the pipe at first because the orb has a positive charge. As soon as the orb touches the pipe, it picks up a negative charge. Since the pipe is negative and the tinsel orb is now negative, they repel away from each other and the orb levitates!

PLS HELP DUE SOON(Ignore that wet thingy on my paper it’s my matcha latte it go on it lol)

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Answer:

well for

1. Because cytoplasm is made of a jelly like consistent

and

2. wastes product are transported by endoplasmic reticulum ,from organelles to outside cell ,so if cell size is big ,it will take more time in transportation and vice versa

Answer: Hello

Explanation: Hello

glacial striations in the bedrock of south africa indicate that glaciers once moved across the african continent the presence of glaciers on the surface of africa is evidence that

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The presence of glaciers on the surface of Africa is evidence that it moved outwards from a central point in southern Africa.

What is a Glacier?

This is defined as the persistent body of dense ice that is constantly moving under its own weight.

Glaciers being found on African surface depicts that the movement occurred outward from Southern Africa during the period.

Read more about Glaciers here https://brainly.com/question/6666513

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.

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b. a chemical change

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.

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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

Please help me with this

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The answer is vinegar and soda

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.

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Answer: think a

Explanation:

A food scientist is determined to create a mango that looks exactly like a mango but tastes like salmon. Can this be achieved through artificial selection? Why or why not?

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No because an artificially ripened mango will have a mixture of light and dark yellow colour on it. This indicates that the mango is not completely ripened. The artificially ripened mangoes will seem ripened on the outside but not on the inside.

Explain the green house effect (make sure that you explain the role of the Nitrogen and Carbon cycle)

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Answer:

Nitrogen emissions such as ammonia, nitrogen oxide and nitrous oxides contribute to particulate matter and acid rain. Nitrous oxide is a particularly potent greenhouse gas as it is over 300 times more effective at trapping heat in the atmosphere than carbon dioxide.

Explanation:

How does the law of conservation of mass apply to this reaction: Mg + HCl → H2 + MgCl2?
A.) Hydrogen and chlorine need to be balanced. There is an equal amount of magnesium on each side
B.) The equation needs to be balanced. There are fewer hydrogen atoms in the equation than magnesium or chlorine.
C.) Only the hydrogen needs to be balanced. There are equal numbers of magnesium and chlorine.
D.) The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.

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Answer: The correct answer is A. Hydrogen and chlorine need to be balanced. There's an equal amount of magnesium on each side.

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!!!!!!!

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Use socratic it’s an app it will have the answer for you
Answer:
FOR A : Once the tennis ball and the board are in motion, they will continue in motion in the same direction at the same speed unless acted upon by an unbalanced force. This demonstrates Newton's first law of motion.

FOR B: When the accelerating ball hits the resting pins, it causes them to become unbalanced forces and they accelerate into each other

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.

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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

Slow cooling of hot magma leads to the formation of ___________ crystals

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Answer:

Slow cooling leads to the formation of large crystals. If the crystals remain undisturbed while cooling, they grow according to a regular pattern. Magma closer to the surface cools much faster than magma that hardens deep below ground. With rapid cooling, there is no time for magma to form large crystals.

Explanation:

Hope it's help

Answer:

large

Explanation:

In a chemical reaction, the mass of the reactants is 13.3 grams. Which of the following could represent the mass of the products?

A. 26.6 grams.

B. 13.3 grams.

C. 39.9 grams.

D. 3.3 grams.

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Answer:

Hi the answer should be 13.3

Explanation:

Hope this helps! :D

B cause the reactants mass must equal the products mass

Iodine-138 decays by beta decay. What element does it produce?

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[tex] {xe}^{138} [/tex]

Explanation:

the bottom number would be 54. This is because you add one to 53 to make it 54 and you add 0 to 138.

Which phrase describes a feature of groundwater?

-feeds rivers
--provides habitats
-makes up 75% of fresh water
--used for hydroelectric power

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Answer:

number 1

Explanation:

Groundwater mainly contributes the water into the surface water like streams, rivers, and lakes.

Groundwater feeds rivers describes it feature.

What is ground water?

Groundwater refer to the water that is below Earth's surface and they infiltrate the fractures of rock formations and spaces between sediments.

Ground water replenish the rivers, streams and lakes.

Therefore, Groundwater feeds rivers describes it feature.

Learn more on groundwater from the link below.

https://brainly.com/question/9617

What causes the seasonal changes viewed in the night sky?

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Answer:

If you look at the night sky different

times of the year you see different

constellation.This change due to the

motion of the earth in it's orbit around

the sun.The shift of the sky is really

the motion of the earth around the sun.

Explanation:

Hope it helps

Explanation:

the factors which bring about the chemical reaction

You have been given the task of designing a heat pack to relieve soreness in muscles by combining oxygen and iron. The more oxygen that is added to iron, the more it will heat up. Which of the following temperature changes would you be looking for?

A.There will not be a reaction
B.An increase in temperature, showing an endothermic reaction
C.You should not expect a temperature change because this is a physical reaction
D.An increase in temperature, showing an exothermic reaction

Answers

Answer:

an increase in temperature showing an endothermic reaction

Explanation:

the atmospheric oxygen is supplied to the iron .An endothermic reaction is any chemical reaction that absorbs heat from its environment.

speed =________

ate divided by time

rate divided by distance

distance divided by time

time divided by rate

I need answer asap! Plz someone help ! Ill give brainliest!

Answers

Answer:

Distance divided by time is the answer. :)

Explanation:

Distance divided by time

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?

Answers

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.

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.

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!!  :)

What will a soccer player need to do to change a ball’s position?
1. He must apply gravity to the ball so that the ball will move.
2. He must weigh the ball to determine the motion that needs to occur.
3. He must set the ball in motion by applying a force in the desired direction.
4. He must identify the location of the ball.
First one to answer will get brainliest!

Answers

Answer:

He must set the ball in motion by applying force in the desired direction.

Explanation:

That is how the soccer player will change the ball's position.

Have a good day :)

Answer:

4. He must identify the location of the ball.

Explanation:

If a soccer player needs to change his position, then he will need to identify the location of the ball.

hope this helped.

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

why does atumn start in diffrent months of the year in north america and south america

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The axis of the earth causes places to be “further” away from the sun.

Answer:

because the sun is further away due to the earth's axis

Plz help! Please write your answer in complete sentences and write a proper answer!
FIrst on to answer will get a brainliest!!! Thx!

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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.

This is the chemical formula of Nitrogen gas.

N₂

Which of the following is NOT true of nitrogen gas?

A. It is made of two atoms.

B. It is a molecule.

C. It is an element.

D. It is a compound.

Answers

D is incorrect it is not a compound.

Answer:

D

Explanation:

N₂ is not a compound because it is not made up of two or more different elements - it is only made up of nitrogen atoms

Hope this helps!

List the communities in a successional sequence of secondary succession?

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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 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.  

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noble gases are used in many situations where a safe and constant environment must be maintained. for example, helium is used to provide a protective atmosphere for making fiber optics and semiconductors. argon is used to fill incandescent and flourescent light bulbs to prevent oxygen from corroding the hot filament. why are noble gases used in these situations? 2x+3x-5=0 I really need sum help plz Which legislation helped convince people to settle in the West in the late 1800s?O Pendleton ActO Homestead ActO Conscription Acto Federal Land Management Act What is a Concussion? How do you get a Concussion? look at screenshot to see question Phan fills the tank of her car with gasoline before starting her road trip. The table below shows the amount of gas left in her tank as she drives. Number of Hours vs. Amount Left in Tank Number of Hours Spent Driving (h) 3 5 7 9 Amount of Gas Left in Tank, in gallons (g) 12 8 4 0 Which equation models the amount of gas left in the car as Phan drives, and how many gallons of gasoline does it take to fill her tank? g = 18 " 2h; 18 gallons g = 18 " 2h; 16 gallons g = 3h 3; 30 gallons g = 3h 3; 12 gallons. 9. A local scientist has studied the population distribution of a species of snail that lives onthe sandy beaches of an island. The island experiences a volcanic eruption. The datafrom the scientist's study of the snail population is summarized below. Prior to theYolcanic eruption, why do you believe the percentage of black snails was so much lowerthan the percentage of light brown snails? Find the value of xSC is the median of QRS Show that the equation y + 8 = 2(4x + 4) is linear and that it represents a proportional relationship between x and y. what is 6/8 x 5? draw a model of your choice to help u solve Verbal communication skills are impacted by which factors? Nineteen less than twice a number is greater than the number added by four The large rectangle below represents one whole. What percent is represented by the shaded area? % how much water will you need to add to your working solution to get to a 100 ml total volume of a 0.03m nacl solution? Find the 57th term of the arithmetic sequence -13,-29,-47,. the difference of a number and 7 WILL GIVE BRAINLIEST Refer to Figure 33-2. A decrease in taxes would move the economy from Q to a) P in the short run and the long run b) R in the short run and the long run c) P in the short run and O in the long run d) R in the short run and Q in the long run The average price of an item is $42 with a standard deviation of $3Find a 98% confidence interval about the mean (one decimal place).Is a value of X=48 unusually high or is it normal? Choose correct explanation! *WILL GIVE BRAINLIEST* Which of the following best approximates the percentages of sand, clay, and silt in a sandy loam? Use the soil texture table below to answer.A. Sand 40Clay 30Silt 30B. Sand 60Clay 10Silt 30C. Sand 20Clay 60Silt 20D. Sand 25Clay 15Silt 60