Chemistry Middle School

In which part of the digestive system does a CHEMICAL change of the food first occur?

In Which Part Of The Digestive System Does A CHEMICAL Change Of The Food First Occur?

Answers

Answer 1
A: mouth. Chemical digestion begins in the mouth when enzymes in saliva begin to break down carbohydrates. Most chemical changes in digestion occur in the small intestine. Large molecules of food are broken down into smaller molecules that can be absorbed by our cells.
Answer 2
The answer is ‘mouth’

Related Questions

What happens to the atoms that make up hydrogen fuel as it burns?

Answers

Answer:

When hydrogen fuel burns, its atoms combine with oxygen atoms in the air, which creates a chemical reaction that releases energy in the form of heat and light. The hydrogen atoms lose their outermost electrons, becoming positively charged ions (protons). These ions combine with the oxygen atoms to form water molecules (H2O), which evaporate into the air as steam. Therefore, the atoms that make up hydrogen fuel ultimately become part of water molecules during the process of combustion.

Explanation:

When hydrogen fuel burns, its atoms combine with oxygen atoms to form water molecules. So the atoms that make up hydrogen fuel become part of the water molecules.

If a substance has a density of 19 g/cm3, then what is the mass of 8 cm3 of this substance?

Answers

The mass is 2.375 grams
The mass is 3.375 grams

which phrase describes air pressure O decreases with denser air O decreases as altitude decreases O equals mass divIded by Volume O decreases as a result of fewer air particles pushing down​

Answers

Air pressure decreases as altitude decreases. This phenomenon occurs because the atmosphere's density diminishes with increasing height above the Earth's surface and the correct option is option 2

As one ascends to higher altitudes, there are fewer air particles above, leading to a decrease in air density. Consequently, the pressure exerted by the air decreases at higher elevations.

Conversely, at lower altitudes, the air is denser due to the larger number of air particles above, resulting in higher air pressure. This relationship between air pressure and altitude is crucial for understanding weather patterns, climate changes, and the functioning of various natural processes on Earth.

Thus, the ideal selection is option 2.

Learn more about Air pressure, here:

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Answer B decreases as altitude decreases

can you please help me

can you please help me

Answers

6CO2+6H2O---C6H12O6+6O2

Answer: 6OC2+6H2O arrow to the right C6H12O2+6O2

Explanation:

Sodium chloride (NaCl) is made from ___ of sodium (Na) and ___ of chlorine (Cl).

Blanks: One Atom and Two Atom

Answers

Answer:

one atom, one atom.

Explanation:

Sodium chloride is made from one sodium atom and one chlorine atom.

Sodium has a charge of +1,  Chlorine has a charge of -1. These cancel each other out leaving only one atom for both sodium and chlorine.

The correct answer is one atom for each space

what is the function of the two microscope lenses?

Answers

The fiction is b because the terms mean subtract
I looked it up but I still couldn’t find the answer

1. What direction does water move if a cell is placed in salt water?

2. What direction does water move if a cell (slightly salty) is placed in pure distilled water?

3. What direction does water move if the concentration of salt is the same inside and outside of the cell?

4. What organelle of the cell controls movement in and out of the cell?​

Answers

Answer:

the water will move into the cell

Explanation:

the hypotonic solution has a higher water potential than that of the cell, so water will enter the cell from a region of higher water potential to a lower water potential down a water potential gradient across a partially permeable membrane via osmosis.

Answer:

left

Explanation:

BRAINLIESIT IF CORRECT




1

BRAINLIESIT IF CORRECT1

Answers

Answer:

Reflected

Explanation:

I hope you get it right!!

Answer: absorbed

Explanation: darker colors absorb more light and heat

What type of person studies and collects data on the weather?

Answers

The answer would be a Meteorologist
Meteorologist is a person who studies and collects data

What is the name of the scientist that looked through a microscope and noticed small box-like structures that resembled honeycombs found in a bee’s nest?
(ill give you brainlest)

Answers

His name was Anton Van Leeuwenhoek

Describe three abiotic and three biotic components of an ocean marine ecosystem.

Answers

Answer:

abiotic sand sunlight water currents

biotic fish bacteria jellyfish

pretty sure this is right

because biotic is living and abiotic is nonliving

Abotic sand
Boric fish

How do the properties of each of these materials vary? Paper and Cardboard, Plastic, Wood, Metals

PLEASE HELP NOW

Answers

They are all made from trees

The properties of all of these material vary from each other. Paper, cardboard and plastic are insulators and metals and conductors. Each of them has different physical properties.

What are physical properties ?

The physical properties of a substance include properties which changes its physical structure, size, shape, phase etc. Solubility, conductivity, resistance etc. are also physical properties.

Here, paper, cupboard and plastic are insulators and they does not conduct electricity. Whereas, metals are very good conductors and they have wide range of applications in optoelectronic devices.

Each of these materials has different melting temperature and different uses. Their density also vary significantly. The paper is the less dense one here and metals are denser.

The applications of these materials are based on their physical properties.

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how many total elements are there in this chemical formula Na3

Answers

Answer:

By November 2016, the International Union of Pure and Applied Chemistry had recognized a total of 118 elements. The first 94 occur naturally on Earth, and the remaining 24 are synthetic elements produced in nuclear reactions.

Explanation:

1, there are 3 Na molecules but they are from the same element, hope this makes sense

Pls somebody help me with this question!
The pictures have to be in order!

Pls somebody help me with this question! The pictures have to be in order!

Answers

Answer:

I believe the organelle should replace the question mark!

The Answer is cell, hope you have a nice day

i want a better example for this than what it gave please

i want a better example for this than what it gave please

Answers

King Phillip Came Over From Great Spain.

The speed at which a nitrogen molecule’s particles are moving increases. What will happen to the thermal energy of this molecule?

A) The thermal energy of the molecule will increase.
B) The thermal energy of the molecule will not change, but its mass will change.
C) The thermal energy of the molecule will not change, and its mass will remain the same.
D) The thermal energy of the molecule will decrease.

Answers

Answer

The thermal energy of the molecule will increase.

Explanation:

Increasing the speed at which the particles are moving cause atoms and molecules to move faster and collide with each other. This increases the thermal energy.

List 2 evidences for climate change.

This is 6th grade science. Amplify.

Answers

Answer:

Global Tempurature is rising

Sea level is rising

Explanation:

This is evidence of climate change. Depending on where you live it could be different like in florida there was a drought.

two pieces of evidence would be that
1. our sea level is rising my a lot
2. our global temperature has changed a lot over the years as well.

Which object has the most kinetic energy?

A. a train that is stopped
B. a car moving at a slow speed
C. ​​a train moving at a slow speed
D. a car that is stopped at the top of a hill

Answers

C

Explanation: kinetic energy means that the object is moving, automatically eliminating A and D since they are both stopped. The formula for kinetic energy is KE=1/2m(v^2) (m= mass and v= velocity). Since the train has more mass than the car, the train has more kinetic energy.
C is the right answer because train has more mass than car

A rock with different fossils is shown below:

A diagram labeled Fossil Layers is shown. The topmost layer is labeled Fish and shows the skeleton of a fish, the second layer from the top is labeled Shell and shows a shell, the third layer from the top is labeled Fern and shows a fern leaf, and the lowermost layer is labeled oak and shows an oak leaf

Based on the fossil, which organism evolved first?

Fern
Fish
Oak
Shell

Answers

i think it’s oak because the oldest fossils are usually at the bottom
oak because the oldest organism is at the bottom, which forms first

How were the novae on Venus similar to the landforms in Gerya’s computer model?

Answers

Answer:

Explanation:

The model results matched the novae on Venus. This provided evidence that Gerya's idea that a thinner crust and higher surface temperature might allow melted rock to push up toward the surface, forming novae.

Could you help me???

Could you help me???
Could you help me???

Answers

Answer:

First one is by the food we eat, we get fuel to be able to move and do work.

Second one is, the effect of speed on kinetic energy is the faster or slower something is going at, the more or less movement needed.

#1

We get the energy by the foods we take and respiration+ digestion plays key role in transformation

#2

Faster the speed faster the Kinetic energySlower the speed slower the Kinetic energy

This is because KE=1/2mv²

How to work out the relative mass of potassium? What is the calculation? ( explained very easily )

Answers

Answer:

39

Explanation:

Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.

Relative Atomic Mass = Mass of one atom
———————————
(1/12)th Mass of one C12 atom

To make a 450g solution with a mass by mass concentration of 7%, how much salt and water do you need to mix?

Answers

Answer:salt: 31. 5g

water: 418. 5g

Explanation

Answer:

salt: 31. 5g

water: 418. 5g

Explanation:

Scientists are working with a liquid that is made of only one type of atom. Which statement correctly describes this liquid?

The liquid contains only one compound.
The liquid contains only one element.
The liquid contains only neutral electrons.
The liquid can be broken down into simpler substances.

Answers

Answer:

Answer Is B

Hope you have a great day!

-BSSkye

Answer:

B

Explanation:

What is similar about how floodplains and alluvial fans form? What is different?

Answers


an alluvial fan is formed as a stream begins to cut into its floodplain. a delta forms in mountainous areas, alluvial fans on flat land. a delta forms while entering water, an alluvial fan forms on dry land.
Oh i remember and i can give you the answer, i learnt this is 6th grade lol

Example of Scientific question?

Answers

Explanation:

how to understand the difference between acid and base

A good scientific question builds on what you already know. For example: “Will fertilizer make grass grow greener?” is not as good as “What types of fertilizer will make grass grow greener?” 4. A good scientific question, when answered, leads to other good questions

Write a summary of what you have learned about how incoming forces and outgoing forces are related (newton's cradle)

Answers

Newton's Cradle is a classic physics demonstration that illustrates the principles of conservation of momentum and energy, as well as the relationship between incoming and outgoing forces. The device consists of a series of equally spaced, suspended metal balls (typically five) that are aligned in a horizontal row. When one ball is lifted and released, it strikes the next ball in line, causing a transfer of force through the remaining balls, ultimately resulting in the last ball swinging outward. This process repeats as the balls continue to collide.

The relationship between incoming and outgoing forces in Newton's Cradle can be understood through the following concepts:

Conservation of Momentum: In a closed system with no external forces, the total momentum before a collision is equal to the total momentum after the collision. In Newton's Cradle, the momentum of the incoming ball is transferred through the stationary balls and eventually to the last ball, which swings outward with a momentum equal to the initial ball's momentum.
Conservation of Energy: Similarly, the total mechanical energy (kinetic and potential) in a closed system remains constant. In the context of Newton's Cradle, the kinetic energy of the incoming ball is transferred through the stationary balls, and eventually to the last ball, which swings outward with kinetic energy equal to that of the incoming ball. Potential energy is also involved as the balls swing and momentarily come to rest at their highest points.
Elastic Collisions: Newton's Cradle demonstrates nearly perfect elastic collisions, wherein both momentum and kinetic energy are conserved. In reality, some energy is lost to heat and sound, making the collisions slightly inelastic. However, the demonstration is still a useful approximation for understanding the transfer of forces.
Force Transfer: The incoming force exerted by the first ball is transmitted through the intervening balls to the last ball without causing any significant movement of the middle balls. This occurs because the balls are very close together and the time taken for the force to be transferred is minimal, allowing the middle balls to remain nearly stationary.
In summary, Newton's Cradle demonstrates the relationship between incoming and outgoing forces through the principles of conservation of momentum and energy, elastic collisions, and force transfer. The device provides a clear visual representation of these fundamental concepts in physics.
Newton's Cradle is a classic physics demonstration that illustrates the conservation of momentum and energy. The cradle consists of a row of suspended metal spheres that are free to swing back and forth. When one of the spheres is lifted and released, it swings down and collides with the next sphere in the row. This collision causes the first sphere to come to a stop and transfers its momentum and energy to the second sphere, which in turn transfers it to the third sphere, and so on. The incoming force from the first sphere is transferred through the chain of spheres as outgoing forces, causing the last sphere to swing upward to the same height as the first. The total momentum and energy of the system remain constant throughout the process, demonstrating the principle of conservation of momentum and energy.

Which of the following is NOT a cost of using fossil fuels?

Which of the following is NOT a cost of using fossil fuels?

Answers

Answer: Burning fossil fuels decreases CO2 in the atmosphere

Explanation: Burning fossil fuel actually increases the amount of CO2 in the atmosphere, it doesn't decrease it.


Hope this helps!

It will be B
Burning fossil fuels decreases co2 in the atmosphere

Which of the units below could be used to measure velocity? Check all that apply.
Group of answer choices

32 ft/sec downward

14 m/s

165 km/min to the right

285 yd/hr

5 mi/min

27 mph North

Answers

The answers are 32 ft/sec downward and 165 Km/min to the right.

Answer:

32 ft/sec downward and 165 km/min to the right

Explanation:

Please answer this!!!!!!!!!!!!!

Answers

What’s the question?

Answer:

oo ok and please i like your pfp

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