Chemistry Middle School

Which statement below describes a physical property of a substance?

A. Helium gas floats because is less air dense than air


B. Sulfuric acid is a toxic liquid

C. Iron rusts when exposed to water and air

D. Sodium metal explodes when exposed to water

Which Statement Below Describes A Physical Property Of A Substance? A. Helium Gas Floats Because Is Less

Answers

Answer 1

Answer:

A

Explanation:

Because density is a physical property and the rest are all chemical properties

Answer 2

Answer:

A

Explanation:

Related Questions

Which surface is most likely to create an echo?
a room with hard, flat walls
a room with hard, bumpy walls
a room covered in soft, wavy curtains
a room padded with soft, flat cushions

Answers

the answer is A. if a sound meets a soft surface like C or D they will be absorbed and wouldn’t bounce back. the answer would have to be either A or B. But the answer is A because the wave remains more intact when it hits a smooth surface.

A room with hard, flat walls surface is most likely to create an echo. Hence option A is correct.

What is echo?

Echo is defined as a recurrence of sound caused by sound waves being reflected off of a wall, mountain, or other obstruction. Bats, dolphins, and fishermen all use echoes to find objects or obstructions. To find an obstruction, they are also utilized in SONAR (Sound navigation and ranging) and RADAR (Radio detection and ranging).

Buildings made of glass, metal, and concrete, the brick and metal interior of a warehouse, marble floors and buildings, or, if the room is designed in such a way that the acoustics produce an echo, plastered and painted interior walls, are examples of man-made materials that are smooth enough to produce an echo.

Thus, a room with hard, flat walls surface is most likely to create an echo. Hence option A is correct.

To learn more about echo, refer to the link below:

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1
Which of the following describes compounds?

a. are composed of two or more elements that are chemically combined

b. are random combinations of elements

c. are composed of elements that join in a specific ratio according to their masses

d. have the same characteristic properties as the elements that form them

Answers

Answer:

A

Explanation: The definition of a compound is two elements chemically connected

1) Would a person's weight on Earth be the same as it would be on the moon? Explain using the key words weight, mass & gravity.

Answers

Answer:

The force gravity exerts on a person determines the person's weight. Even though your mass would be the same on Earth and the moon, if you weigh 132 pounds (60 kilograms) on Earth, you would weigh about 22 pounds (10 kilograms) on the moon.

Explanation:

Show your appreciation by marking this as brainliest.

Which statement is a hypothesis?

A- crickets are cooler than grasshoppers

B- if the temperature increases, then crickets will chirp more.

C- I hear crickets in the summer, so crickets chirp more when it’s war outside

D- dose temperature affect how much crickets chirp?

Answers

Answer: C) Does the temperature affect how much crickets chirp

Explanation:

B. (If. Then. Because) statements.

Which one is the molecule?

Oxygen (O)

Dioxygen (O2)

Answers

Oxygen is the molecule.

Answer:

Oxygen (O)

Explanation:

Which interaction occurs when light goes into an object as heat energy?

Answers

Answer:

Absorption. Absorption occurs when photons from incident light hit atoms and molecules and cause them to vibrate. The more an object's molecules move and vibrate, the hotter it becomes. This heat is then emitted from the object as thermal energy.

Explanation:

How do planets with larger masses apply greater gravitational forces on objects compared to planets with less mass?

⇒ Please answer in your own words

Answers

Answer:

it's bigger

Explanation:

it's bigger than the planet with less mass

Answer:

bigger.

because the bigger the plant is the less mass it has .

hope this helped you

Which method of galaxy formation is expected to dominate far in the future?(1 point)

A) primordial collapse
B) merging
C) slow evolution
D) spreading

Answers

Answer:

its c) slow evolution

Explanation:

I took to qc

How large is a typical animal or plant cell? A. 1-100 millimeters B. 1 meter C. 10-100 nanometers D. 10-100 micrometers WILL MARK BRAINLEST Science

Answers

D.) 10-100 micrometers

Answer:

10-100 micrometers

Explanation:

PLS HELP
Look at the graduated cylinder. It contains the liquids listed in the data table. Match each liquid to the correct layer in the graduated cylinder. PLS HELP

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Answers

Answer:

canola oil goes on top below that is salt water below that is ether and below that is corn syrup

Explanation:

What is a characteristic of hardness in science?

Answers

Answer:

The ability to resist being scratched—or hardness—is one of the most useful properties for identifying minerals. Hardness is determined by the ability of one mineral to scratch another.

The ability to resist being scratched or hardness is one of the most useful properties for identifying minerals.

HELPPPPPPPPP
HI PLSPLS

Answers

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True! Jajsjsjsnsjsjskskskskskskdkzkxjdueidixiidd

Jim thinks that he can throw a baseball six meters per second. What does the six meters refer to? (2 points)

a
The speed the baseball travels in six seconds.

b
The distance the baseball travels in one second.

c
The distance the baseball travels in six seconds.

d
The time it takes the baseball to travel one meter.

Answers

The answer is b. hope this helps
the answer is b (the distance the baseball travels in one second)

HELP!!!!!

Physical Models Activity

You have explored some interesting, informative, and amusing examples of models. Now it's time to get creative and make your own model. Here is the requirement checklist for your model:

✔ Model types can include drawings, diagrams, physical models, virtual simulations, or videos.
✔ Models must be created by you, not something selected from an online or outside source.
✔ Submit a presentation, picture, video, or screenshot of your model.
✔ Submit a one-paragraph summary describing the topic you chose, your model, what it represents, how you made it, and the specific science involved. It is important that you are using science terminology and are accurate.
Now that you know how to create and submit your model, you will need to choose a topic for your model. Choose one of the three topics listed below. Select each topic for an overview.

Conservation of Mass
Atomic Theory
Thermal Energy

Answers

Answer:

Thermal Energy-Explore the effects of thermal energy. Model how adding or removing thermal energy affects motion in particles in a pure substance, such as water, or in a chemical reaction.

Explanation:

Answer: okay so!! I picked Atomic Energy, and i found some models- I'm not entirely sure what type of model this is supposed to be, so I found what i think it is. I hope I'm not late!!

Explanation:

Alright here's the description:Atomic optimism, from the History of Atomic Energy Collection.

so, i thought you could do a voice over (2:00 to 3:00 minutes long) of what you think the meaning of this is, or write a short summary of it.

(Of course you would have to crop this because,it wouldn't let me send it in cropped. I hope this helped!

Which part of the ear converts vibrations into nerve impulses?
cochlea
auditory nerve
outer ear
eardrum

Answers

Answer:

cochlea

Explanation:

The cochlea is filled with a fluid that moves in response to the vibrations from the oval window. As the fluid moves, 25,000 nerve endings are set into motion. These nerve endings transform the vibrations into electrical impulses that then travel along the eighth cranial nerve (auditory nerve) to the brain.

:)

Cochlea

The cochlea is filled with a fluid that moves in response to the vibrations from the oval window. As the fluid moves, 25,000 nerve endings are set into motion. These nerve endings transform the vibrations into electrical impulses that then travel along the eighth cranial nerve (auditory nerve) to the brain.

2) In the formula p=mv, identify the word that each letter stands for.

Answers

Answer:

p = momentum

m = mass

v = velocity

Hope this helps!

Mass if you use mass in the in situation

How is your eardrum similar to a real drum?
It vibrates.
It is unpredictable.
It produces sound.
It is hollow.

Answers

Answer:

it vibrates

Explanation:

drums vibrates to make noise, and ear drums vibrate from sound.

Answer:

it vibrates

Explanation:

i took this quiz

What answer best describes Carbon Dioxide (CO2)?

compound

molecule

element

Answers

Answer:

Molecule

Explanation:

Hope this helps!

I’m pretty sure it’s a molecule by its only 2 elements
It’s not elements bc elements is only one

Explain how you can determine which gas is most likely to work well in a thermoacoustic generator based on position on the periodic table.

Answers

Answer:Osmium and hassium are most likely to have similar properties because they are in the same group. Argon and neon are in the same column of the periodic table.

Answer:

Osmium and hassium are most likely to have similar properties because they are in the same group. ... Argon and neon are in the same column of the periodic table

Can you make some notes related to these texts?

Answers

Answer

Explanation:

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Picture #1:
• Acceleration: change in velocity compared with the time it takes to change
- Average Acceleration: (Final Velocity - Starting Velocity) / Time
• Velocity: expressed in meters per seconds (m/s)
• Time: expressed in seconds (s)
• Acceleration is measured in meters per second per second
- meters per second squared (m/s²)

Picture #2:
• Acceleration is a vector
- magnitude
- direction
• Acceleration: increases and decreases in speed
• Positive Acceleration: increase in speed
- sliding down from a hill
- small velocity -> large velocity
• Negative Acceleration: decrease in speed
- car slowing then
- high velocity -> low velocity
- initial velocity is larger than final velocity
- (v2 - v1) will be negative
- acceleration “a = (v2 - v1) / t” will be negative
• Acceleration and velocity (rate of motion) in the same direction = speed will increase.
• Acceleration and velocity in opposing directions = speed will decrease

Picture #3:
• Acceleration: rate at which velocity changes
• Velocity is a vector: has magnitude & direction
- magnitude or direction changes = the velocity changes
• Object accelerates speed = direction of motion or both magnitude and direction changes
• Acceleration depends on amount of time for the change to take place and how much velocity changes
- Small change in velocity can be a large change in acceleration if the change occurred quickly.
- Large change in velocity can be a small change in acceleration if the change occurred slowly.
- Increasing speed by 5 m/s in 5 seconds is smaller acceleration to increase speed by 5 m/s in 1 second.

Picture #4:
• An object changing the direction of motion experiences acceleration even when not speeding up or slowing down
• An object is always turning.
• Centripetal Acceleration: acceleration in circular mode.

Part A
Describe the type of change in matter that occurred in thisinvestigation and provide evidence to support your response.

Part B
Describe a chemical property of baking soda.

Part C
Explain how the results of the investigation support the Law of Conservation of Matter.

Part D
Provide a brief explanation whythe investigation measurements differed.

Answers

Answer:

part b:

Sodium bicarbonate is a white, crystalline powder that sometimes forms lumps. It is odorless and has a bitter, salty taste. At room temperature, it is a solid. Solubility, or the ability of a substance to dissolve in water, is also a physical property. Sodium bicarbonate is soluble in water and can be separated from water through evaporation.

Explanation:

In the reaction of baking soda with acetic acid carbon dioxide gas is evolved that's why the balloon inflates. The mass in the product side and reactant side ar equal and the the total mass is conserved.

What is mass conservation?

According law of conservation of mass, mass can neither be created nor be destroyed. Therefore, the total mass of a system will be conserved. In a chemical reaction, the total mass of reactants is equal to the total mass of products and thus no mass loss occur there.

In the reaction of vinegar (acetic acid) and sodium bicarbonate or baking soda, the mass on both side is equal and we get the product mass equal to the total mass of reactants if the experiment is carefully done.

Sodium carbonate is a colourless weak base, which can easily react with an acid and gets protonated. When sodium bicarbonate that is NaHCO₃, with vinegar CH₃COOH, it will produce carbon dioxide and water.

This carbon dioxide gas evolves to the balloon which is stretched on the top and the balloon will inflates.The measurements will differ at each moment because we are measuring it in different events of the reaction where the gas is evolving out.

To find more about baking soda, refer the link below:

https://brainly.com/question/17560232

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heeeeeeeeeeeeeeeeeellllllllllllllllllllllllppppp

Answers

Answer:

Atomic number = 42

Chemical symbol = Mo

Number of protons = 42

Atomic mass = 96

Number of electrons = 42

Number of valence electrons = 1

number of electrons in n=3 shell = 8

Number of neutrons = 54

hope this helps :)

help me fastttttttttttt

Answers

Answer:

True is my answer

#Carry on learning#:)

Answer:

True

Explanation:

Bc u said it already the answer

when enough stress builds up in brittle rock, the rock breaks, causing a ___ to form

Answers

How do faults form? When enough stress builds up in rock then the rock breaks creating a fault. A normal fault occurs when rock is being pulled apart by tension; in this type of fault the hanging wall moves downward and the foot wall moves upward due to the tension in Earth's crust.

the answer is “a fault”

how can I determine which gas is most likely to work well in a thermoacoustic generator based on position on the periodic table.

Answers

Answer:

Well, you can determine by the placement of the element on the table. I hope this helps you! :)

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Answers

Answer:

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Answer:

A. 1.67×10^-24

Explanation:

In many environments, the temperature of the ground and the air right above the ground are both very similar in the middle of the night. Engineers have proposed developing a portable pop-up hammock that would allow people to sleep suspended in the air above the ground in emergencies. It will take time and money to develop a really lightweight, easy to collapse, low cost design. Before they invest the resources to do this, explain whether what you learned about energy transfer makes this an idea worth pursuing. Would suspending a person in a hammock, wrapped in one of the blankets you chose above, decrease the amount of temperature change compared to sleeping directly on the ground with one of these blankets? Explain.

Answers

Answer:

yes i think so

Explanation:

Hammock is a good idea to reduce the effect of cold in  night. It is more better than  sleeping directly on the ground with one of these blankets, because, the heat will transfer from us to the cool ground which make us more cool.

What is heat transfer?

Heat is able to transfer from the hotter region to colder region based on the temperature gradient. The temperature gradient occurs from the difference in heat radiated in each regions.

The convection current in air occurs due to this temperature gradient. During winter seasons, the colder grounds can absorbs the heat from our body and make us cool. Thus, contact with the ground in colder nights make us more cool.

The same advantage of air circulation around your body on warm nights is provided by a nylon hammock. Additionally, a cozy under blanket (like this one from Cedar Ridge or this one from Little Shop of Hammocks) will keep your backside warm when the weather drops.

To find more on hammocks, refer here:

https://brainly.com/question/29007897

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A dog whistle has a high frequency. What can you infer about the dog whistle?

It would be very loud.

It would have a high pitch.

It would have a high amplitude.

It would have a long wavelength.

Answers

Answer: It would have a high pitch.

Explanation: since the whistle has a high frequency, I can infer that it will have a high pitch.

Answer:

it would have a high pitch

Explanation:

like if u take a hearing test the sounds are usually high pitch

What are the 3 properties of metals?

Answers

Answer:

lustrous durable highly malleable

Explanation:

brainliest plz

High melting points
High density
Good conductor of heat and electricity

“ As temperature increases, energy increases, and the speed of the molecules _______________ .”

Answers

Answer:

If the temperature is increased, the average speed and kinetic energy of the gas molecules increase.

Explanation:

It increases as well, the temperature increase causes the molecules to collide faster and faster inside the matter, therefore even the kinetic energy increases
Hope it helped
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