Chemistry Middle School

Please help, 25 Points!

Answers

Answer 1

Answer: 48

Explanation:

Number of protons + Number of neutrons = mass number

Number of neutrons = Mass number - Number of Protons

Number of neutrons = 84-36

Number of neutrons = 48

Atomic number is equal to how much electrons there is

To find the number of neutrons, one have to subtract the atomic number from the atomic mass.

84-36=48

Related Questions

16. What is the speed of the object represented by the graph?

A.0.5 m/s
B.2 m/s
C.5 m/s
D.10 m/s

Answers

Answer: 5 m/s

Explanation: At 1 second, the graph shows the object has travelled 5m. At 5 seconds, the object has travelled 25m.

answer: the answer is 5 m/s

What happens to the chemical properties of substances during a chemical reaction?

Answers

Answer:

In a chemical reaction only the atoms show in the reaction and they can end up in a product. Also, in a chemical reaction the reenact with one another to break down the product. They can also bond and rearrange the atoms to make a new product.

Explanation:

Hope this helps :)

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will give brainly

Answers

I think the answers are A, C, A.

The answers for those are A,C ,A

Early man discovered it and used it with wood. When I use it on this thing it smells so very good.

Answers

Answer:

Fire was found by early man and used with wood, and it is used on a candle to smell good.

The answer to the riddle you provided is "fire." Early humans discovered fire and used it in conjunction with wood for various purposes, such as cooking, and providing warmth, and protection. When you use fire on something, it often produces a pleasant aroma or smell.

The picture shows the Prairie blazing star, a flowering plant found in a prairie environment.

How does the body plan of the Prairie blazing star help it carry out its life processes?
A.
Being in groups helps it to attract pollinators, and the roots touching each other allow the plants to share nutrients.
B.
The narrow leaves help it to attract herbivores to carry seeds, and the roots fan out to find water of a large surface area.
C.
The height of the plant allows it to receive direct sunlight, and the flowers prevent herbivores from trying to eat it.
D.
The deep roots allow it to find water in a usually dry environment, and the narrow leaves help prevent water loss through evaporation.

Answers

Answer:

Explanation: hope this helps

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Which part of a plant is responsible for carrying out photosynthesis

Answers

Answer:

A leaf prepares food for the plants. The process of making food by the plant using carbon dioxide, water, chlorophyll, and light is called photosynthesis. Plants store food in the leaves, fruits, and stems in the form of starch. Plants breathe with the help of their leaves.

Explanation:

The chloroplast because it is

Please help me I will give you the brain thing and extra points. 1/9
image below

Answers

the answer is C i think

Answer:

It is C

Explanation:

20 is the major force on the box and 10 on the left is the counter force so it is cthe resulent force

What causes physical weathering?

Answers

Answer:

its when something is weathered

Explanation:

Answer:

Physical weathering is caused by the effects of changing temperature on rocks

Explanation:

Please hurry I need to get this done, Please help me I will give you the brain thing and extra points.
image below 8

Answers

Answer:

Explanation:

The box will not move since its the same amount of force on each side.

The answer is A

Since the force being put on both sides is the same the box won’t move.

Where do flowers come from? They are made through the process of sexual reproduction. Flowers may look simple, but there are actually several parts that allow it to reproduce. Let's take a closer look. Glad my mom didnt make me read this out loud- THIS WAS IN MY FREAKING SCHOOL WORK IM NOT LYING LIKE LOL

Answers

Answer:

They're sexual reproduction

Explanation:

A flower throws seed at another flower

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The distance from the crest of one wave to the crest of the next wave.
A. microwaves
B. longitudinal
C. wavelength
D. electromagnetic
E. gamma rays
F. mechanical

Answers

Answer:

Explanation:

Answer:

Explanation:

How many hydrogen atoms are in 2NH(4)

4 is a subscript

Answers

Answer:

Explanation:

Answer:

8 atoms

Explanation:

There are two sets of NH4 ( 2NH4) and the subscript means there are 4 hydrogen atoms in every set. if you distribute the 2, 2*4=8

2(NH4) = N2H8

can anybody define hypothesis in their own words? (its for school)

Answers

Answer:

An educated guess based on what you already know.

Explanation:

It’s basically an educated guess, but not a far out stretched guess like say you were testing which baby birds could fly, you could make a guess by seeing how they work & conclude your answer. hope this helps!

Help me please!

Why was the microscope and its improvement an important part of the development of the cell theory?

Answers

The improvement of the microscope allowed for scientist to clearly see cells better than ever before.

It allowed scientists to better understand what a cell looked like and it gave them a clearer picture of the cell itself. It also proved the cell theory.

Algal blooms which pollute streams, rivers, and lakes are caused by the presence of O A. lead. O B. oxygen. C. mercury. D. phosphates. O E. E. DDT.

Answers

Answer: oxygen

Explanation:

Oxygen is right

B is the choice needed to choose

Which of the following is NOT a gland?
A. Pancreas
B. Neuron
C. Thyroid
D. Pituitary
help please!

Answers

B! Neuron controls the glands and other things in the brain, it is not a gland

answer A
explanation: a neuron is a nerve cell that carries electrical impulses

Good Morning I need help with this science work, please help it would mean a lot.

Answers

That’s easy it would be B.

Two important ways that energy is transported in the world around us is through __________ and _________.

Answers

The two ways that energy can be transferred are by doing work and by heat transfer.

Work and heat transfer

Valence electrons will either ______________ or ______________ to form molecules.

Answers

Answer:

ionic or covalent

Explanation:

The outermost electrons -- the valence electrons -- are able to interact with other atoms, and, depending on how those electrons interact with other the atoms, either an ionic or covalent bond is formed, and the atoms fuse together to form a molecule.

If your reactants are equal to our products in our chemical equation, then the arrow should always be pointing towards the?

Answers

It would be facing the right

It should point to the right

How does water vapor effect the way you breathe and how you can feel the climate change around you?

Answers

Fills your lungs with air that I’m not great

Answer:

Water vapour is an efficient greenhouse emission, because it will absorb radio wave radiation and radiates it back to the surface, so contributive to warming. when put next to alternative greenhouse gases, water vapour stays within the atmosphere for a way shorter amount of your time, However, When you exhale and it's cold outside, though, the vapour in your breath loses its energy quickly. instead of continued to maneuver freely, the molecules begin to pack themselves closely along. As they are doing this, they cut down and start to alter into either liquid or solid varieties of water.

Help ;-;

Will give Brainliest and 25 Points

Answers

I don’t see what you need help with but thanks:)

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When the Statue was unveiled in 1886, it was a shiny brown color, like a penny. The reason the Statue of Liberty changed colors is that the outer surface is covered with hundreds of thin copper sheets. Copper reacts with the air to form a patina. This is an example of a ______.

Physical Change
Chemical Change
Chemical Property
Physical Property

Answers

Answer:

Chemical Change

Explanation:

HEllo i need help with reading how do i read

Answers

try to sound out the words ! :)

which metal will cool faster in water
steel
copper
brass
aluminum

Answers

Answer:

Copper!

Explanation:

Hope This Helps

Answer:

Aluminum

Explanation:

Valence electrons will either ______________ or ______________ to form molecules.

Answers

Answer:

ionic or covalent

Explanation:

join other electrons to make a full shell or share the electrons

What are two ways to practice conservation? How would your proposals help?

Answers

Answer:

Check your toilet for leaks. ...

Stop using your toilet as an ashtray or wastebasket. ...

Put a plastic bottle in your toilet tank. ...

Take shorter showers. ...

Install water-saving shower heads or flow restrictors. ...

Take baths. ...

Turn off the water while brushing your teeth. ...

Turn off the water while shaving.

Does seeing a gas produced always mean a chemical reaction is occurring? Explain.

Answers

Seeing signs of a chemical reaction does not always mean that a reaction is happening. For example, a gas (water vapor) is given off when water boils. ... You can tell that it is a physical change because water vapor can condense to form liquid water. In a chemical change, a new substance must be produced.

Answer:

Seeing a gas produced not always means a chemical reaction is occurring.

Explanation:

The following clues for an occurrence of a chemical reaction:

Color: The color of the solution changes when mixed with another solution or on the addition of a solid to a solution.Temperature: Rise or fall in temperature of the substance formedPrecipitation: Formation of solid substance that is precipitateGas evolution: Bubbles or gas formation. Evolution of gas or fumes from the solution.Odor: The smell of the reacting mixture initially differs from the smell of the products

Yes, gas formation is one of the clues of the occurrence of a chemical reaction but it is not completely true.

This is because the evolution of gas also occurs when a substance undergoes a physical change.Water vapors on boiling water, sublimation of dry ice giving carbon dioxide gas.

So, from this, we can conclude that seeing a gas produced not always means a chemical reaction is occurring.

Learn more about observations of chemical reactions here:

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Plz help!!!!!!!!!!!!!!

Answers

I think it’s d
If it’s wrong then I’m sorry

Answer:

Explanation:

Please hurry I need to get this done, Please help me I will give you the brain thing and extra points.
image below 9

Answers

The answers is C because they are pulling with different amount of forces opposite ways and there is more force towards the left.

Hey Answer is c ...........

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