Chemistry Middle School

what kind of substances and mixtures do you see around you? How do their properties determine what they used for?

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Answer 1

Answer:

look around your property you'll find something!

Explanation:

Related Questions

Can you please help me

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answer:

The first in the row is correct

The correct answer is c I hope this helped you

Which best describes the products of a chemical reaction?

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Answer:

Q1 part D Q2 part B

Explanation:

After the chemical reaction, the things that you get are known as products.

Do you think rayon when burnt will stick to the body like other synthetic fibers?

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In other words, since rayon is made from the plant fiber it does not get stick to our body while we burn it

it will not stick to the body most likely

Calculate the volume (in cm3
) of 54 g
of water at 1 ∘C
.
Express the volume in cubic centimeters to two significant figures.

Answers

157,464 I think this is the answer

since the density of water is 1, then 1g = 1cm^3. So the volume of 54g of water is 54cm^3 with 2 significant figures

Chemical Weathering Rocks are changed by chemical and physical weathering. During chemical weathering, the composition of the rock is changed. Extreme heat and pressure within Earth can also cause rocks to change chemically. Physical weathering is the breaking down of rock by wind, water, ice, temperature change, and plants. It changes the shape and size of rocks, but it does not change their properties.

circle each example of chemical weathering

•Shale is worn into small pieces by the wind.
• Sandstone experiences heat and pressure and becomes quartzite.
• Calcium carbonate dissolves.
• Rocks break into pieces as they tumble down a mountain.

Answers

An example of chemical weathering are;

Sandstone experiences heat and pressure and becomes quartzite. Calcium carbonate dissolves.

What is Chemical Weathering ?

Chemical Weathering can be described as the type of weathering that do take place due to the breaking down of the rock particles into smaller pieces which is usually as a result of chemical process.

It should be noted that when the process is taking place it scould be due to the Extreme heat and pressure which can affect the composition of the particles and as a result of this there could be formation of products from the break down.

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The two examples of chemical weathering in these 4 options are
Sandstone experiences heat and pressure and becomes quartzite
Calcium carbonate dissolves
These are both examples of chemical weathering because the composition of these things changed. When shale is worn into small pieces, it is still shale, and rocks breaking into pieces as they tumble down a mountain are both examples of physical weathering because the weathering is not changing the composition of the rock.

Can someone help me with this math question plzz thx!!

Answers

Answer:

i dont think that is math but i think it might be C

Explanation:

It should be C if not then I’m sorry

Why is the sun's renewable energy important to animals?

1. they are able to directly convert the sun's energy into food
2. they eat plants that get their energy from the sun
3. the suns energy isn't important to animals because they don't depend on the plants
4. they absorb the sun's energy through their skin as a way of staying warms

Answers

Answer:

2. they eat plants that get their energy from the sun

Explanation:

Based on the way energy flows through an ecosystem, animals could not survive if they did not have the source of plants. So, the sun's renewable energy is important to animals because the sun helps them grow their food.

I hope this helps and makes sense!

Answer:

4. they absorb the sun's energy through their skin as a way of staying warms

Explanation:

What is the concentration of H+ ions at a pH = 7?

_____ mol/L

What is the concentration of OH– ions at a pH = 7?

______ mol/L

What is the ratio of H+ ions to OH– ions at a pH = 7?

______ :1

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Answer:

Explanation:

You must know the concept of pH of a solution and its relation to the concentration of H+ and OH- ions. pH is a measure of the substance's acidity or basicity. From the definition of Arrhenius, an acid contains an H+ while a base contains a OH- ion. From this definition, we can say that an acidic substance has a higher concentration of H+ ions. Now, I'll introduce here that pH is the value of the negative logarithm of the concentration of H+. In equation,

pH = -log[H+]

The term pOH is therefore also, pOH = -log[OH-]. Therefore, the relationship that connects the two negative logarithms is:

pH + pOH = 14

The pH scale starts from 1 being the most acidic to 14 being the most basic. The neutral pH is 7. Thus, for a pH of 7, the H+ and the OH- concentrations are equal.

pH = 7 = -log[H+]

[H+] = 1×10⁻⁷ mol/L = [OH-]

Since the concentrations are equal, the ratio is equal to

Which event occurs after erosion of Earth’s surface?

A:Surface material breaks down into smaller pieces.
B:Very dense particles settle faster than low-density particles.
C:Large particles are carried away to a new location by ice and glaciers.
D:Round particles form new landforms more slowly than flat particles do.

Answers

Answer:

A:Surface material breaks down into smaller pieces.

Explanation:

hope this helps.

Answer: b. Very dense particles settle faster than low-density particles.

Explanation:

Which event occurs after erosion of Earths surface?A:Surface material breaks down into smaller pieces.B:Very

im not very good with science and i just need help with this assignment please

Answers

Answer:

Hey,

So what you would do here is first choose a biome, such as the desert for example, then choose an organism that lives there, or an animal. Then think of what it is like where it lives, is it dry, cold, windy, and so force, just describing the place by its looks and climate. How would this population increase, maybe it would be if there was suddenly more food there for them, or if their ecosystem got better for them to live, then, if they populated more, how would that affect the ecosystem. Maybe some animals would die off more, or some would have to much food. Like what if the fly population suddenly doubled, for example, how would that affect the ecosystem? Now what would happen if that organism was removed? If flies were removed, spiders and a lot of other organisms would not have food, and some organisms would overpopulate because nothing would eat them. That is just an example.

Explanation:

I hope this helps, sorry if not. Have a great day!

Biome: Tropical Rainforest

Organism: Jaguar

1. Jaguars live in a range of habitats, including arid scrubland, thick tropical forests, swamps, coastal mangroves, lowland river valleys, grasslands, and mixed-conifer forests. They gravitate toward areas near rivers and streams.

2. Habitat loss, wildlife trafficking, collisions with vehicles, and retaliatory killings by landowners and ranchers who fear that jaguars will kill their livestock have significantly lowered the population numbers of jaguars and threaten them with eventual extinction.

3. If jaguars were to go extinct, the number of these animals would perhaps increase, which might change the current ecosystem, from what it is now, to a new ecosystem that will adjust to the species left.

Biome 2: Desert

Organism: Camel

1. No matter the type, camels are usually found in the desert, prairie or steppe. Though many people think that camels only live in hot climates, they do well in temperature ranges from 20 degrees F (minus 29 degrees.

2. The sudden increase in camel populations could be also related to massive import of live animals. The Arabian Peninsula countries are among the main camel importing countries.

3. A mob of feral camels moves across arid land in the Australian Outback. The animals, introduced to the area in the 1800s, are causing enormous damage to the ecosystem. ... Camels also damage salt lake ecosystems, pollute waterholes, and destabilise desert dunes, which can lead to erosion. Meaning There would be less damage to the ecosystem.

piece of roasted salted fish is put in a mouse trap. explainwhy the mouse comes to the trap

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the mouse could have been scavenging for food and thought that it found some. It would unexpectedly walk into the trap because of how desperate it is for food, especially with suspected predators around.

Answer: Food

Explanation:

The rat smells the food or sees the food it goes towards the food to eat it.

What is Waves? Please help will give brainliest

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Answer:

Waves involve the transport of energy without the transport of matter. In conclusion, a wave can be described as a disturbance that travels through a medium, transporting energy from one location (its source) to another location without transporting matter.

Explanation:

hope this helps, I tried to give an easy definition :)

Witch statement correctly compares the masses of subatomic particles in an atom such as carbon

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Answer: The statement that correctly compares the masses of subatomic particles in an atom such as carbon is "The mass of a neutron is slightly larger than the mass of a proton, and the mass of an electron is much smaller than that of a proton or neutron." This is because an atom such as carbon is composed of protons, neutrons, and electrons. Protons and neutrons are approximately the same mass and are much more massive than electrons. Therefore, the mass of a neutron is slightly larger than the mass of a proton, and the mass of an electron is much smaller than that of a proton or neutron.

Explanation:

Answer:

Explanation:

PROTON AND NEUTRON HAVE SAME MASS . WHILE PROTON HAS APPROXIMATELY 1869 TIMES MORE MASS THAN ELECTRON

please helpp, its just true or false

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Answer:true

Explanation:

please solve this for me

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The standard reduction potential for the half-reaction of Be^2+ + 2e^- -> Be is given as E^0 = 3.83 V.

For the half-cell Hg^2+ | Hg, the standard reduction potential is not provided in the given information. To calculate the electric potential for the voltaic cell, we need the reduction potential for the Hg^2+ | Hg half-cell.

A voltaic cell, also known as a galvanic cell or an electrochemical cell, is an electrochemical device that generates electrical energy through a spontaneous chemical reaction. It consists of two half-cells connected by an external circuit and a salt bridge or porous barrier that allows the flow of ions between the two half-cells.

Each half-cell consists of an electrode immersed in an electrolyte solution. The electrode is typically made of a metal or a conductive material, and the electrolyte is a solution containing ions that can participate in the redox (reduction-oxidation) reaction.

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Answer:

The standard reduction potential for the half-reaction of Be^2+ + 2e^- -> Be is given as E^0 = 3.83 V.For the half-cell Hg^2+ | Hg, the standard reduction potential is not provided in the given information. To calculate the electric potential for the voltaic cell, we need the reduction potential for the Hg^2+ | Hg half-cell.

Draw Bohr diagrams for the following

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example calculation for a.)

N = 39 - P

N = 39 - 19

N = 20

P = 19

Idek what a bohr diagram is but I think the first person answered this for you

Lina and Vera purchased fruit pops at the grocery store. The drive home was hot an the fruit pops turned slushy. After a few hours in the freezer, the fruit pops were solid again and ready to eat. What is the relationship between temperature and particle motion?
A. Decreased temperature means particles have greater motion.
B. Decreased temperature stops particle motion.
C. Increased temperature means particles have greater motion.
D. Increased temperature means particles have less motion.
E. Temperature does not affect particle motion.

Answers

i believe the answer is c.

Lina and Vera purchased fruit pops at the grocery store. The drive home was hot, and the fruit pops turned slushy. Increased temperature means particles have greater motion.

What is temperature ?

Temperature is a physical quantity that quantifies our feelings of hotness and coldness. A thermometer is used to measure temperature. Thermometers are calibrated in a variety of temperature scales that have historically been defined by various reference points and thermometric substances.

Temperature is a measure of a system's average kinetic energy. As particles in a matter move faster, their kinetic energy increases, raising the temperature of the system. Heat is defined as the energy exchanged when two bodies of different temperatures come into contact.

The total energy of all molecular motion inside an object is defined as its heat. Temperature is a unit of measurement for the thermal energy or average heat of molecules in a fluid.

Thus, option A is correct.

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how can you determine if the information you are reading is based on science or not?

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Typically if based on science it will have scientific terms or be believable and backed up by facts

Clear scientific writing generally follows a specific format with key sections: an introduction to a particular topic, hypotheses to be tested, a description of methods, key results, and finally, a discussion that ties these results to our broader knowledge of the topic

When the speed of the bottle is 2 m/s, the KE is kg m2/s2. When the speed of the bottle is 3 m/s, the KE is kg m2/s2. When the speed of the bottle is 4 m/s, the KE is kg m2/s2. When the speed of the bottle is 5 m/s, the KE is kg m2/s2. When the speed of the bottle is 6 m/s, the KE is kg m2/s2.
instructions
In this part of the experiment, you will be changing the speed of the bottle by dropping it from different heights. You will use the same mass, 0.250 kg, for each trial, so record this mass in Table B for each velocity. Then, calculate the expected kinetic energy (KE) at each velocity. Use the formula KE = mv2,
where m is the mass and v is the speed. Record your calculations in Table B of your Student Guide.

Answers

Answer:

Based on the given instructions, you need to calculate the expected kinetic energy (KE) at each velocity using the formula KE = mv^2, where m is the mass and v is the speed. The mass is given as 0.250 kg.

Table B: Calculation of Kinetic Energy (KE)

Speed (m/s)Mass (kg)KE (kg m^2/s^2)20.2500.50030.2500.75040.2501.00050.2501.25060.2501.500

To calculate the kinetic energy at each velocity, multiply the mass (0.250 kg) by the square of the velocity.

For example, when the speed of the bottle is 2 m/s: KE = (0.250 kg) * (2 m/s)^2 = 0.250 kg * 4 m^2/s^2 = 1.000 kg m^2/s^2

Perform similar calculations for the other velocities and record the results in Table B.

Answer:

Explanation:mass of the bottle in each case is M = 0.250 kg

now as per given speeds we can use the formula of kinetic energy to find it

1) when speed is 2 m/s