Chemistry Middle School

Which of these is an example of how a scientist might use a model?

A) using a stopwatch to clock a runner's mile time
B) measuring the mass of an object with a scale
C) magnifying a group of cells with a microscope
D) building a brain made of plastic with many of its parts labeled

Answers

Answer 1

Answer: Marbles placed inside a hollow sphere are used to describe protons in a nucleus.

Answer 2
D, because it’s a model, not a real life subject. Have a great day!

Related Questions

i need this answer asap!!!!!

i need this answer asap!!!!!

Answers

it’s the fourth answer option

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

What do cones and flowers have in common

Answers

Answer:

They are both produced by trees and both generate seeds for reproduction.

Cones and flowers look completely different, but they have more similarities than you may think. They are both produced by trees and both generate seeds for reproduction.

Explain 1 difference between Prokaryotic and Eukaryotic cells. plz plz plz plz plz help me plzzzzzzzzzzzzz all my points this due today

Answers

Answer:

Prokaryotes are organisms made up of cells that lack a cell nucleus or any membrane-encased organelles. Eukaryotes are organisms made up of cells that possess a membrane-bound nucleus that holds genetic material as well as membrane-bound organelles.

Explanation:

Answer:

Prokaryotic cells do not have membrane bound organelles such as mitochondria, nucleus, etc. Eukaryotic cells consist of membrane bound organelles which are tiny compartments in the cell designed for a specific purpose such as the nucleus, mitochondria, etc.

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

HELP RTIGHT NOWWWWWWWWWWWWWWWWW

HELP RTIGHT NOWWWWWWWWWWWWWWWWW

Answers

Explanation:

biosphere

that is the answer

Answer:

biosphere

I hope it help

some living organisms can be _________ while some are _________?

Answers

Answer:

1. animals

2. plants

Explanation:

1. plants 2.animals

Please help me por favor :'(

Please help me por favor :'(

Answers

More volume, takes longer to heat all the molecules.

HELP ASAP!! An experiment is performed in which a crystalline substance is added to a beaker filled with room-temperature water. The following observations were made:
1. The crystals dissolve.
2. A precipitate forms.
3. The bottom of the beaker feels warm to the touch.
4. Bubbles begin to form in the water.
Which observations are evidence that a chemical reaction took place?

Answers

Answer:

observations (2), (3), and (4) provide strong evidence that a chemical reaction occurred.

Explanation:

Observations (2), (3), and (4) are evidence of a chemical reaction because a precipitate formed, energy was released (the bottom of the beaker felt warm), and bubbles were formed in the water. Observation (1) indicates a physical change, not a chemical reaction.

observations 2, 3, and 4 indicate that a chemical reaction has occurred.

Candice did an experiment where wondered if temperature affects how cheese molds. She put a piece of cheese next to a different heat lamp and then measured how much mold was on each cheese. What is the DEPENDENT variable?

Answers

How much the cheese molds. Since it depends on the heat lamp.

Simple and complex molecules are similar in that they both involve ____ atoms A water B simple C bonded D complex

Answers

Answer:

The answer is C.

Explanation:

Please give brainliest

Answer:

D

Explanation:

complex, in chemistry, a substance, either an ion or an electrically neutral molecule, formed by the union of simpler substances (as compounds or ions) and held together by forces that are chemical (i.e., dependent on specific properties of particular atomic structures) rather than physical.

Similar to desert animals, chaparral animals are adapted to survive _________________ temperatures, hunting at _________________ and living underground during the day. Cold-blooded reptiles, small _________________ and insects live here

Answers

Answer:

1. hot    2. night   3. mammals (not completely sure about this one)

Explanation:

Could hydrogen fuel replace fossil fuels in the future? Why or why not?

Answers

Answer:

Hydrogen is the most plentiful element in the universe, so there’s no chance for human consumers to instantly use it up. So yes, hydrogen has the possibility of being the fuel source of the future.

Explanation:

A family decides to use their bicycles to get to the mall on weekends instead of driving a car. How is the family helping the environment?

The family is using less renewable resources.
The family is using less non-renewable resources.
The family is causing less fertilizer to enter the water.
The family is causing less trees to be cut down.

Answers

Answer:

they are using less non renewable resources

Explanation:

Answer:

the second option:

The family is using less non-renewable resources.

Explanation:

If a car was used, the gas in the car would cause damage and or make the air dirtier than it already is (from the fums).

Plus when using a car, you waste more gas as well as money.

Louise has put together the setup shown in the figure to investigate how different masses respond to different forces. A mass is attached to two stretched springs. It rides on a track with very little friction. When Louise pushes the mass to either side and then lets it go, it oscillates back and forth, much like a pendulum. Explain why the mass oscillates.

Louise has put together the setup shown in the figure to investigate how different masses respond to

Answers

Answer:due to the kinetic energy stored in spring

Explanation:

this happen because when spring ia stretched it store kinetic energy and it has the ability to move back and forward so this happen

Due to stored kinetic energy in the spring, the mass oscillated like a pendulum.

It is given that a  mass is attached to two springs that are stretched. When Louise pushes the mass to either side and then lets it go, it oscillates back and forth resembling a pendulum.

This movement is observed because the mass if the block placed is shared between the two springs. This let the two springs to store the energy in them. This could also be given as potential energy.

When the mass is moved in the either side, the potential energy in the springs are turned into kinetic energy leading to movement of the mass. Since, the mass is help up with two springs, oscillatory movement or to and fro motion of the spring is observed.  

To know more about pendulum, click below:

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Which phases does water go through if you use distillation to separate it from dissolved sugar?

Answers

Answer:

a physical change

Explanation:

here's why a chemical change produces new chemical products in order for sugar and water to be a chemical change something new would need to resolve a chemical reaction would have to occur

Fill in the blanks:
An ___________ measures wind speed and a _________ shows wind direction.

A.weather balloon; electroscope

B.anemometer; wind vane

C.flask; beaker

D.oscilloscope; seismograph

It's science btw

Answers

Answer:

A.weather balloon; electroscope

Answer is B. Anemometer; wind vane

How can temperature lead to weathering of rocks? (1 point)How can temperature lead to weathering of rocks? (1 point)

a. Rocks become ice when they get cold, which can later melt and wash away.

b. Rocks can melt when they become hot, which can lead to pieces breaking off.

c. Rocks expand and contract when they are heated and cooled which cause them to break.

d. Rocks move faster when they are heated, which can cause the pieces to eventually
Which part of Earth experiences physical weathering? (1 point)
a crust
b inner core
c mantle
d outer core
Which is the last stage of physical weathering in rocks? (1 point)
a boulder
b pebble
c sand
d rock
What must be present on a rock that undergoes frost wedging?(1 point)
a sharp edges
b round shape
c holes around it
d crack

Answers

Rocks expand and contract when they are heated and cooled which cause them to break. Physical weathering is experienced to the crust of earth. The last state of physical weathering is sand. Rocks that have some cracks are undergoing frost wedging.

What is weathering?

Weathering is a geographical process of deterioration of rocks and minerals into parts and eventually into dust and sand. Thermal stress, a phenomenon caused by temperature variations, can also contribute to mechanical weathering.

The expansion and contraction of rock is influenced by temperature changes. The rock's structure deteriorates as this occurs repeatedly. Physical weathering and mechanical weathering disintegrates rocks without any chemical changes and  it happens to the earth's crust.

Erosion of rocks eventually results in formation of sand. Frost wedging is a process by which ice erodes the rocks having cracks. It is also called ice wedging.

To find more on rock weathering, refer here:

https://brainly.com/question/28755105

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Answer: How can temperature lead to weathering of rocks= Rocks expand and contract when they are heated and cooled which cause them to break.

Which part of Earth experiences physical weathering= crust

Which is the last stage of physical weathering in rocks= sand

What must be present on a rock that undergoes frost wedging= a crack

Explanation: I took the test

What was one was one important impact of Supreme Court's ruling in Bush v. Gore

What was one was one important impact of Supreme Court's ruling in Bush v. Gore

Answers

Answer: the answer is b or c

Explanation:

I took it

The answer is C, i took that test before and got it right

The corn crop in an area is prone to infestation by larvae from moths that feed on the cornstalks and ears of corn. The techniques used by two farmers to protect the corn crop are described below.

Technique A: Sprayed his corn crop with an insecticide. The insecticide is known to kill all honeybee, butterfly, and moth larvae.
Technique B: Used a genetically modified variety of corn. The plant produces an insecticide which selectively kills only the moth larvae as it feeds on the corn.

Which technique is likely to have less of an impact on the environment?

Technique B because it may help humans who consume corn to fight bacteria
Technique A because it kills a broader variety of insects to protect the corn
Technique B because it preserves the harmless insects and targets only the moth larvae
Technique A because insecticide use is better for preserving the environment.

Answers

Answer:

Its C

Explanation:

Method A puts a type of spray that kills bees plus butterfly's which would make their population decrease. Which isnt helpful and harms the enviroment a lot. Answer A dosent make sense it may be harmful

Answer: c

Explanation:

I took the quiz

Someone please help me with this question.

Keith is investigating how elements combine to form different types of matter. Write a statement regarding natter that is true.

A. Atoms can combine to form compounds.
B. The element make up the building blocks of all matter.
C. Every atom will bond to achieve a stable neutron-proton ratio.
D. There are more than 100 naturally occurring elements that make up all matter.

Answers

Answer:

D. There are more than 100 naturally occurring elements that make up all matter.

Explanation:

All matter is made up of elements, which are substances that cannot be broken down into simpler substances by chemical means. There are more than 100 naturally occurring elements, each with its own unique properties and characteristics. These elements combine to form compounds, which are substances made up of two or more elements that are chemically combined in a specific ratio. For example, water is a compound made up of two hydrogen atoms and one oxygen atom. Atoms can bond with each other in various ways to form compounds, but they do not always bond to achieve a stable neutron-proton ratio. The stability of an atom or compound depends on a variety of factors, including the arrangement of its electrons and the nature of the chemical bonds it forms with other atoms.

Answer:

D. There are more than 100 naturally occurring elements that make up all matter.

How would you measure 20 grams of salt? Describe how you did this.


(this is due by tmr so someone please help!)

Answers

Answer:

I would just find a measuring cup and do it that way it's the easiest way

use a weighing scale. Put a bowl or cup on the weighing scale take off the weight of it- set weight to 0, and then put in the salt nd measure up to 20g

What was the low temperature for hurricane Katrina?

Answers

Answer: 90 degrees F

Explanation:

The temperature was 90 F (32 C)

i will give brainlyst for this so pls help
CHOOSE 2 ANSWERS

i will give brainlyst for this so pls helpCHOOSE 2 ANSWERS

Answers

Answer:

Air pressure and Temperature.

Air pressure and temp

?What statement best describes the arrangement of the atoms in an ethylene molecule?

Answers

Answer: Two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.
Two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.

What holds everything in place in the universe?

Answers

Answer:

Gravity

Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.

Explanation:

hope this helps

gravity because yes

im giving brainliest

Answers

Answer:

a

Explanation:

just needed the points, sorry

Answer:

I'm confused what is this?

Explanation:

Which has a positive charge?

neutrons and the nucleus

protons and neutrons

neutrons and electrons

protons and the nucleus

Answers

protons and the nucleus

Because protons has positive charge. Neutrons have no charge. Nucleus contains protons and neutrons, so it adds up to result in a positive charge.

Protons and the nucleus

I will brainly
And 5 star rate

I will brainly And 5 star rate

Answers

Answer:

False

Explanation:

Tearing a paper is a physical change because when the paper is torn only the appearance of paper is changed.

Ricardo and Maria conducted an experiment to test if the mass of a ball affects how fast it would roll down a ramp. They set up the experiment using a ramp and three balls of different masses. They tested each ball once and recorded their results. They concluded that the more mass a ball has, the faster it will roll down the ramp. Why is this experiment not reliable?


Their experiment was not controlled.


Their experiment did not test enough variables.


Their experiment was not performed multiple times.


Their experiment was not performed by multiple people.

Answers

the answer is C because they only tested each ball one time making it unreliable
The answer is C because they only tested each ball one time making it unreliable
Ricardo and Maria conducted an experiment to test if the mass of a ball affects how fast it would roll
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