The sum of the protons and neutrons in an atom equals the?
nucleus number
atomic number
atomic mass
mass number

Answers

Answer 1

Answer:

mass number

Explanation:

The sum of the protons and neutrons in an atom equals the mass number of such an atom.

Mass number is the mass of an atom. The mass of an atom is concentrated in the nucleusThe particles in the nucleus are the protons and neutrons.

So;

Mass number = number of protons + number of neutrons.


Related Questions

Which of the following does not apply to water molecules?

Water molecules are polar
Water has cohesive properties
Water is less dense as a solid than a liquid
Water is not a very good solvent

Answers

Answer:

It is the last one.

Explanation:

Water molecules are polar, they have cohesive properties, and water is less dense when it is solid than when it is a liquid, that is why ice floats in liquid water. However, water is a very good solvent, it can dissolve many solids, including sugar, salt, and other hydrophilic substances.

How to do this question plz answer me ​

Answers

Answer:

  dissolved

Explanation:

The figure shows sodium chloride is in solution. It gets that way by being dissolved.

Calculate the percent composition of C6H12O6

Answers

Answer:

Did you just let your cat walk on your keyboard? XD

Could you explain this a bit better please?

I'll answer the question in the replies of this comment if you can give me a bit more information.

Explanation:

May I have brainliest please? :)

I WILL GIVE BRANLIEST HELP HELP HELP THE SUBJECT IS ACTUALLY SCIENCE What factor is a mushroom in an ecosystem? Abiotic or Biotic?

Answers

Answer: The answer is biotic

Explanation:Mushrooms are biotic because they are living things. Abiotic means non living, so these are factors in the environment that influence a living thing's life and chance of survival

Answer: jdusjzj bacteria germs

Explanation:

Why should a hypothesis be testable?
A. It must be testable in order to be found true or false.
B. It must be testable for the outcome to be predictable.
C. It must be testable for other scientists to consider it reliable.
D. It must be testable if it is to become a scientific theory.

Answers

A. It must be testable in order to be found true or false.

The growth of a plant toward light is called _____.

phototropism
tropism
geotropism

Answers

It's called phototropism

Answer:

The answer is (Phototropism)

Momentum is mass times

A. acceleration
B. velocity
C. distance

Answers

B. velocity

This is the answer

1. What part of the human body has the same role as the power source in a computer?

2.What part of the human body has the same role as the keyboard or the mouse on a computer?

Answers

Answer:

The heart

Hand

Explanation:

The part of the human body that has the same role as the power source in a computer is the heart. A power source in a computer provides energy that powers the whole system.

The human heart provides the pumping action for the circulatory system. Just like current passes through wires in a computer by energy from the power source, the human heart pumps blood throughout the body in a like manner. Without the pumping action of the heart, the human body is dead.

Also, keyboard and mouse are input devices. They are used to give instruction and perform certain tasks on the computer system.

The human body can also carryout tasks by using the hand. Objects are moved from one place to another just as you drag an icon using the mouse. We type word processors using information from the keyboard, also, we are able write using pen on paper.

How much heat is required to raise the temperature of a 6.21 g sample of iron from 25.0 oC to 79.8 oC?

Answers

Answer:

151.1J

Explanation:

Given parameters:

Mass of iron  = 6.21g

Initial temperature of iron  = 25°C

Final temperature of iron  = 79.8°C

Unknown:

Amount of heat = ?

Solution:

The amount of heat require to cause this temperature can be determined using the expression below;

    H  = m c (T₂ - T₁)

H is the amount of heat

m is the mass

c is the specific heat capacity

T is the temperature

    Specific heat capacity of iron 0.444J/g°C

Insert the parameters and solve;

     H  = 6.21 x 0.444 x (79.8 - 25)

     H   = 151.1J



2. What properties do all acids have?

3. Why should you never use taste as a method for testing an unknown substance?

4. What is used to detect the presence of acids?

10. What can you use to detect the presence of a base?

11. What are some common bases that we use every day?

12. How does an antacid help reduce heartburn?

13. What happens when acid and base are mixed

14. What is used to determine the pH of a substance?

15. Describe how the pH scale works. In other words, what is it actually measuring?

17. Why is pH important to our environment?

18. Describe how salt is formed.

Pls help!!!!!

Answers

2. They taste sour, are electrolytes, and react with active metals to produce hydrogen.

3. You should NEVER taste unknown chemicals because many are poisonous and can destroy body tissue.

4. Most often dyes are used to detect acids. The dyes will turn a certain color which indicates the presence of an acid.

10. You can use litmus to detect wether a solution is a base or an acid.

11. The most common bases I can think of would be: baking soda, laundry detergent, or soaps.

12. Antacids work by neutralizing the acids in your stomach.

13. When an acid and base are mixed together, they produce a salt.

14. Normally pH meters are used, but you can also calculate the pH using math. (yuck)

15. The pH scale measures how acidic or basic a substance is. It ranges from 0-14, with 7 being neutral.

17. pH is very important to the environment as it helps us measure and monitor for safe water conditions. A rise or fall from the average water pH level can indicate chemical pollution.

18. Salt is formed when an acid and base react with each other. It then has a cation of the base, and anion of the acid.

I hope those helps!! (:

HELP ME PLEASE ! I NEED HELP !
Which statement best completes the diagram?
Mexican culture
Most people live in
urban areas.
The most widely
spoken language is
Spanish
?
A. The most important literature is nonfiction
B. The most popular foods are vegetarian,
C. The most common religion is Catholicism.
D. Most people work as farmers.

Answers

Answer:

The answer is (c)

Explanation:

Answer:

C. The most common religion is Catholism.

Explanation:

I'm taking the quiz rn.

What is an important part of the endocrine system that acts as a chemical messenger?


hormones


arteries


spinal cord

neurons

Answers

Hormones ! hope i helped :)

paragraph on water cycle

Answers

Answer:

The water cycle or hydrologic is a continuous cycle where water evaporates, travels into the air and becomes part of a cloud, falls down to earth as precipitation, and then evaporates again. ... These areas are usually close to oceans or large bodies of water that allow more water to evaporate and form clouds.

Explanation:

Directions: Read through each scenario and identify the independent variable, dependent variable, and the control.

Question 1

1 pts

Rob is in charge of waxing the floor at the local mall. He wants to test a new brand of floor wax called

Squeaky Clean. Rob waxes 20 floor tiles with Squeaky Clean and 20 tiles with the original wax brand.

After one week he counts the number of scratches on the floor. What is the independent variable?

number of floor scratches

brand of floor wax

20 tiles with original brand wax

Answers

Answer:

The correct answer is - brand of floor wax.

Explanation:

The independent variable is the variable or the factor in an investigation which is manipulated or change in the experiment and affects the dependent variable and produces a various result.

In this investigation, there are different brands of the floor was are the independent variable as they are changed to see the effect on the scratches on the floor on 20 tiles for each brand.

Help please If there are 10 moles of HCl gas occupying 15L at 350°C, what is the pressure? Be sure to show the setup and
the final answer and unit.
Show Your Work

Answers

Answer:

P = 34.1 L

Explanation:

Given data:

Number of moles = 10 mol

Volume occupy = 15 L

Temperature = 350°C

Pressure of gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

350+273 = 623 K

by putting values,

P×15 L = 10 mol ×0.0821 atm.L/ mol.K ×623 K

P = 511.48atm.L/15L

P = 34.1 L

A geologist was looking at a new

mineral they found. The mineral

sample was gray, non-metallic, had

density of 3.8 g/mL, and a volume

of 48.3 mL

Of the observed properties listed

below, which is considered to be an

extensive property?

A Gray

B Metallic

C Density

D Volume

Answers

Answer:

D. Volume

Explanation:

Properties mentioned in the question;

colour = gray

Nonmetallic

Density = 3.8 g/mL

Volume = 48.3 mL

Of the mentioned, which is extensive ?

Extensive properties are those properties that are proportional to the amount of substance present.

The correct option is D. Volume. The other properties do not change with increasing or decreasing amount of the mineral

Which method of heat transfer is the person in the picture below most worried about?

Radiation

Conduction

Convection

Answers

Answer:

Radiation ...........

Hey There!_____________________________________Answer:

[tex]\huge\boxed{Conduction}[/tex]

_____________________________________Conduction:

Conduction is the transfer of heat when two things come in contact with each other. The energy transfer is from hotter body to the colder body.

                                x---------------------------------------------x

Fire Walking:

There is a trick behind fire-walking. When the coal burns, after sometime there is a layer of ash on the surface of the coal which blocks the radiation. So the transfer of heat is not possible from radiation. Conduction is the only way possible. The person's feet and coal both are poor conductor of heat so if we walk quickly i.e. there is minimal time of contact with the coal, it will just feel a little warm. As the person start walking on the coal, It has to do it quickly, that way Person will feel its sole warming up but it is not that hot because of the layer of ash and poor conductance, after few steps the ash also sticks on to the sole of the person which makes kind of double layers of ash. So the only way for heat transfer is CONDUCTION.

_____________________________________Best Regards,'Borz'

Please help me what is the answer

Answers

There are 20.8 moles of propanol

Further explanation  

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

1.2 x 10⁵ molecules of propanol

[tex]\tt \dfrac{1.25\times 10^{25}}{6.02\times 10^{23}}=20.8~moles[/tex]

Below is a phase diagram for Carbon Dioxide. Use this diagram to answer the following question.
In this example we will start the Carbon Dioxide out at a temperature of -20oC and 1 atm of pressure. If the pressure was raised to 100 atm of pressure while still staying at -20oC, what phases would the Carbon Dioxide change between?

Answers

If you mark those points on the phase diagram it appears to be moving from vapor to liquid. If you can’t see how I determined that please let me know and I can further explain.

Vapor to liquid is the same as saying gas to liquid, which I believe to be the correct answer.

Which models of the atom does the experimental evidence from Bohr's hydrogen experiment support? Explain why these models are compatible with the experimental results.

The models are Daltons, Thompsons, and Rutherfords

Answers

Answer:

Rutherfords

Explanation:

The model of the atom supported by Bohr's hydrogen experiment is the Rutherford's model of the atom.

Rutherford through his experiment on gold foil suggested the atomic model of the atom. The model posits that an atom has a small positively charged center(nucleus) where nearly all the mass is concentrated.

Surrounding the nucleus is the large space containing electrons. In the Bohr's model of the atom, he suggested that the extranuclear space of the atom is made up of electrons in specific spherical orbits around the nucleus.

Please help brainiest is award!

Answers

I need more characters but it is b

how is a solute and a solvent different

Answers

Solute is substance which is dissolve in a solvent and Solvent is a substance that dissolves solute in a solution.
Answer: Solute is the substance being dissolved, and solvent is the substance that the solute is dissolving in. For example, 1 g of sugar in 100 mL of water. Sugar is being solved so it is the solute, and water is what the sugar is dissolving in so it is the solvent.

When naming acids the prefix hydro- is used when the name of the acid anion ends in___

Answers

Answer:

hydrochloric acid

Explanation:

These anions usually have the ending “-ide.” As acids, these compounds are named starting with the prefix “hydro-,” then adding the first syllable of the anion, then the suffix “-ic.” For example, HCl, which is hydrogen and chlorine, is called hydrochloric acid. More complex acids have oxygen in the compound.

Butane and methyl propane are an example of a pair of

Answers

They are a pair of structural isomers because they both have the same chemical formula of C4H10 ingrained in each other
The answer is isomers pair

What are the coefficients that will balance the skeleton equation below?

___GaF3 +___KCN rightwards arrow___Ga(CN)3 + ___KF





A.
1, 3, 1, 3

B.
3, 1, 3, 1

C.
1, 1, 1, 3

D.
1, 3, 3, 1

1 points

QUESTION 6

The previous question is an example of what type of chemical equation?

A.
Synthesis

B.
Decomposition

C.
Single Re-Placement

D.
Double Re-Placement

Answers

1, 3, 1, 3

Explanation:

Ga - one on both sides

F - three on both sides

CN - three on both sides

K - three on both sides

But remember that CN was being multiplied by 3 on the right side already, meaning GA(CN)3 didn't mean a coefficient.

Answer:

Double re-placement

The two metals switched dance partners, that means it's a double.

How many electrons are located in the outermost energy level in the Bohr model of a boron atom? hint it not 4

4
3
2
1

Answers

2 is the answer iam not sure about it
Yes

When the following equation is balanced, what is the coefficiant for Br?

___I2 +___NaBr rightwards arrow___NaI +_?_Br2

A.
6

B.
3

C.
1

D.
2

1 points

QUESTION 10

The previous question is an example of what type of chemical reaction?

A.
Synthesis

B.
Decomposition

C.
Single Re-Placement

D.
Double Re-Placement

Answers

Answer:

1. A 2. C

Explanation:

because it just is

A beaker filled with 100 ml of water has an initial temperature of 23 degrees Celsius. After the beaker has been heated, the final temperature is 100 degrees celsius. The final volume of the water is 85.32 ml. After reaching the final temperature, there are bubbles throughout the water. What is this an example of?

Answers

Answer:  The temperature of a beaker of water is 318.2 K.

Explanation:

Multiplying the temperature in Celsius by tells us how many Fahrenheit degrees above the freezing .

An isotope of Cesium -137 has a half-life of 30 years. If 1.0 g of Cesium – 137 disintegrates over a period of 60 years, how many grams of Cesium- 137 would remain?

Answers

Answer:

Explanation:

Radioactive decay follows the equation:

Ln [A] = -kt + ln [A]₀

Where [A] is amount of isotope after time t: Our incognite,

k is rate constant: ln 2 / Half-life = 0.0231 years⁻¹

t are 60 years

[A]₀ is initial amount of isotope: 1.0g

Replacing:

Ln [A] = -kt + ln [A]₀

Ln [A] = -0.0231 years⁻¹*60 years + ln 1.0g

ln [A] = -1.386

[A] = 0.25g

Question 4 of 10
What is the molarity of a solution of 3 moles (mol) of FeBr3 in 1/2 L water?
A.
3 mol/2L
B.
2L/3 mol
C.
0.5L/3 mol
D.
3 mol/0.5 L
SUBMIT

Answers

Answer:

B

Explanation:

Answer:

D. 3 mol/0.5 L

Explanation:

Just took the quiz

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