A student submits the following work on the mass number, but he has made a few mistakes. Select the sentences that are incorrect.

Calculating the mass number for an atom requires that we know the atomic number and the number of protons in the atom’s nucleus. The mass number then gives us the average weight of atoms of a given element. Specifically, these units are calibrated by setting the mass number for carbon-12 as 12 atomic mass units. Neutrons and protons have the same masses. However, as long as the number of protons equals the number of neutrons, the values balance out and we always obtain a whole number for the mass number.

Answers

Answer 1

Answer

 

Calculating the mass number for an atom requires that we know the atomic number and the number of protons in the atom’s nucleus. The mass number then gives us the average weight of atoms of a given element. However, as long as the number of protons equals the number of neutrons, the values balance out and we always obtain a whole number for the mass number.

Explanation:

those 3


Related Questions

what do waves carry from place to place​

Answers

Answer:

Waves carry energy from place to place.

Explanation:

Some waves are used for mainly communication and phone signals. They help people get internet in the middle of nowhere if you are near an energy wave.

Calculate the volume 3.00 moles of a gas will occupy at 24.0 °C and 762.4 mm Hg.

Answers

Answer:

Use formula of PV = nRT

Change formula to solve for Volume = nRT/P

R is a constant 0.08206

Convert C to Kelvin which is just +273

And turn mmHg into atm which is around 1 atm

Plug in and solve

what is the mass of 8.12×10 to the 23rd power molecules of CO2 gas

Answers

Answer:

38.7 g is the answer to your question. Your welcome:)

Mark is in charge of making change at his family's garage sale on a hot summer day. He runs low on change and brings out a jar of pennies from the house. He keeps the lid off of the jar. Later in the day, he notices that the pennies are hot. Which statement best explains what happened?\

Answers

Answer:

This question is incomplete

Explanation:

The question is incomplete without the options. However, when a metal (in this case what the pennies are made of) is left in direct contact with the heat from the sun, it conducts this heat and becomes hot. This process is called thermal conduction. The thermal energy is readily accepted by the material in which the pennies are made of thereby increasing the thermal energy of the penny coin  which then makes the pennies hot after being left under the sun.

Joyce poured 200 milliliters (mL) of water into a beaker, placed a thermometer in it, and heated it until it started to boil. She recorded a temperature of 100 degrees Celsius (°C) when it started to boil. She repeated the process with 400 mL of water. What would be the temperature when this second sample started to boil?

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Answer:

100°C

Explanation:

The boiling point of water is 100°C and the difference is when will the water start boiling.

If the reaction force is _____, a net force is created and will accelerate the object.

Answers

Answer:

directly proportional

Explanation:

have a good day

Answer:

Unbalanced is the answer

Which isotope of sulfur is the most naturally abundant

Answers

Answer:

The Isotope of sulfur.  

32S 94.99% stable.

33S 0.75%   Stable.

Explanation:

Where is the youngest rock in the Atlantic Ocean found?

Answers

Answer:

oceanic ridge

The youngest rocks on the ocean floor are located at the oceanic ridge, an underwater mountain range formed from the spreading of tectonic plates in.

Explanation:

1234567891011121314151617181920

Deciding that she was thirsty, Ms. Smith decided to mix up some lemonade using 2 tablespoons of lemonade, and 2 cups of water. What is the solute and solvent?

Answers

Explanation:

solute is the substance being dissolved so that is the 2 tablespoons of lemonade and the 2 cups of water is the solvent.

The heat required to raise the temperature of 12g of water from 16 C to 21 C is:
a) 60 J
b) 60 cal
c) 50 cal
d) 50 J

Answers

Answer:

The correct option is;

b) 60 cal

Explanation:

The mass of the given water, m = 12 g

The initial temperature of he given water = 16°C

The final temperature of the given water = 21°C

The specific heat capacity of water, c = 4.184 J/(g·°C) = 1 cal/(g·°C)

The amount of heat, ΔQ, required = Mass × Specific heat capacity × Change in temperature

ΔQ = 12 × 4.184 × (21 - 16) = 251.04 J

Similarly, we have;

ΔQ = 12 g × 1 cal/(g·°C) × (21 - 16)°C = 60 cal

The amount of heat required = 60 cal.

Having a widow's peak like Wentworth
Miller is dominant.

Not having a widow's peak, like Rihanna, is
recessive.
10) If Wentworth Miller is Aa, and he and Rihanna had children, what are the possible
phenotypes and genotypes of their children?

Answers

Answer:

Aa 50% Widow's peak, aa 50% no Widow's peak

Explanation:

In the crossing over the phenotypes of their children, 50% are widow's peak (aa), while 50% are not widow's peak (Aa) because the widow's peak genes only show trait when it is in recessive condition.

What is a recessive condition?

An inheritance pattern known as autosomal recessive inheritance allows a genetic disease or characteristic to be transferred from parent to offspring.

When a kid receives one altered (mutated) gene from each parent, a genetic disease may result. An autosomal recessive disorder is typically not present in the parents of a kid who has it.

Describes a property that can only be observed when a genotype is homozygous, a feature that is often concealed by other inherited qualities but survives in a population of heterozygous genotypes.

The crossing between Aa X Aa

Gametes: A and a.

The cross is attached in the image below.

Therefore, the gene's dominant allele, which is expressed when its alleles are distinct, is the case when the alleles are different. The recessive allele effect is hidden by the other allele's effect.

Learn more about recessive, here:

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Describe the specific steps a scientist would take to solve a particular problem

Answers

Answer:

scientific method

Explanation:

- make an observation

- ask a question

- form a hypothesis

- make a prediction based on the hypothesis

- test the prediction

- iterate: use the results to make new hypotheses or predictions  

What is force and motion

Answers

force is a strength or energy as an attribute or physical action or movement, motion is the action or process of moving or being moved

Answer:

In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity (which includes beginning moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull.

= google

lol

What is the difference between Chemistry and Alchemy?

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Answer:

The difference between alchemy and modern chemistry is alchemy is based on a mystic, supernatural view of reality, whereas chemistry assumes reality is basically natural.

Explanation:

hope this helps!

What is the conversion factor used when converting mass to moles?

Answers

In such a conversion, we use the molar mass of a substance as a factor to convert that to mole units into mass units (or, conversely, mass units into mole units).

Then We also established that 1 mol of Al incorporates a mass of 26.98 g (Example). Stated mathematically that is, 1 mol Al = 26.98 g Al

                                     Molar mass

Now, This relation provides a factor to travel from grams to moles.

which is help to Using the factor 98.08 g / 1 mol: grams H 2 SO 4 = 3.60 Then mol x 98.08 g / 1 mol = 353 g H 2 SO 4

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What factors are included on a phase diagram?
O A. Temperature and pressure
O B. Pressure and volume
O C. Mass and volume
O D. Heat and kinetic energy

Answers

Answer:

A. Temperature and pressure

Explanation:

The factors included in a phase diagram are the temperature and pressure conditions.

A phase diagram is a combined plot of three curves all in equilibrium;

Solid- liquid, liquid -gas, and solid -gas plots

On the vertical axis, we usually have the pressureOn the horizontal axis is where the temperature is represented. Most phase diagrams are used in chemistry and mineralogy to show areas in which different phases can exist at equilibrium.

The factors included on a phase diagram are temperature and pressure and the correct option is option A.

A phase diagram is a graphical representation that shows the different phases of a substance (solid, liquid, and gas) as a function of temperature and pressure. It provides valuable information about the conditions at which different phases can exist and the boundaries between them.

The temperature is typically plotted on the horizontal axis, while the pressure is plotted on the vertical axis.

By examining a phase diagram, one can determine the melting point, boiling point, and critical point of a substance, as well as the regions of stability for each phase. Additionally, phase diagrams can reveal the existence of phase transitions such as melting, boiling, and sublimation.

Thus, the ideal selection is option A.

Learn more about Phase diagram, here:

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Considering the principles of KMT, which scenario would result in an increase of particles effective collisions at STP None of the above None of the above In a balloon In a balloon A container with large volume A container with large volume A container with small volume

Answers

Answer:

A container with small volume

Explanation:

The question is obviously incomplete because the image attachments are missing.

However, it is necessary to note that, the effective collisions depends on the volume of the gas.

The lesser the gas volume, the greater the effective collision between particles at STP.

Hence from the KMT, the scenario having the least volume of gas will have the greatest magnitude of effective collisions.

list 3 examples of pairs of atoms with ionic bonds​

Answers

Answer:

Na(0.93) & F(3.98)

K(0.82) & Cl(3.16)

Cs(0.79) & Br(2.96)

Explanation:

challenges we will face terraforming Mars

Answers

Because Mars has no atmosphere, astronauts will be exposed to high levels of cosmic radiation which could cause cancer or death. The lack of atmosphere also produces severe weather - very high and low temperature as well as very high wind speeds. Astronauts will likely have to live nearby caves or underground until an atmosphere can be formed due to these elements.

Earth's revolution takes 365.25 days. What is a revolution?

Answers

Answer:

"Revolution" refers the object's orbital motion around another object.

plz mark brainliest :DD

How would you arrange the objects below from greatest to least volume?

A balloon
A water bottle
A bottle of soda
A rock

Answers

Answer:

A balloon

A bottle of soda

A rock

A water bottle

Explanation:

A rock
A balloon
A water bottle
A bottle of soda.

A physical change is easier / more difficult to reverse than a chemical change.

Answers

Answer:

the answer is that a physical change is easier to reverse then a chemical change.

Explanation: In order for a physical change to take place it's easier to just undo what happened then if it was a chemical change because in order for very few chemical changes to reverse to it's original substance you would need another chemical change.

Which element has the electron con guration 1s 2 2s 2 2p 3 ? A. boron B. nitrogen C.
uorine D. phosphorus

Answers

C...zzzzzzzzzzzz....... who

Answer:

I believe it’s nitrogen

Explanation:

Becasue nitrogen is the 7th element

Which has a smaller ionic radius than it's neutral atom?
A. Iodine
B.Cesium
C.Oxygen
D.Nitrogen

Answers

Explanation:

Caesium (Cs) has a smaller ionic radius than it's neutral atom.

because Caesium belong to Group 1 and It loses 1 electron. After losing 1 electron it gains 1 positive charge that's why caesium ionic radius become smaller as compared to neutral atom.

Therefore,

Option B is correct.

Please help
The charge of o monatomic ion is its oxidation number.
O True
O False
O Neither

Answers

It is going to be neither hope this helps

ANSWER ASAP PLEASE!!

What determines how many of each ion is required for an ionic compounds?

please do not look up on google!!!!

Answers

Each ion has a single charge, one positive and one negative, so we need only one ion of each to balance the overall charge. When writing the ionic formula, we follow two additional conventions: (1) write the formula for the cation first and the formula for the anion next, but (2) do not write the charges on the ions.

The graph above compares three states of a substance.

Which of the following choices would NOT be an appropriate label for the y-axis?


A. motion of particles.

B. density of particles.

C. randomness of particles.

D. kinetic energy of particles.

Answers

Answer: is C

Explanation:

Identify the chemical formula of ammonia.

Answers

Answer:

The chemical formula for ammonia is NH3

Explanation:

Nitrogen trihydride

1. A cube of wood having an edge length of 15.3 cm has a mass of 2800 grams. What is the
density of the wood in g/cm3?

Answers

Answer:

a cube wood is mass ig haha sorry bby :(

Explanation:

What is meant by a solute-give an exmple.
What is meant by a solvent - give an exemple
what is meant by a solution -give an exmple
what do the following symbole mean s,l,g and aq
what is the difference between filtration and crystallisation ​

Answers

Answer:

A solute is a substance that dissolves in a solvent to for a solution.Example; Sugar.

A solvent is a substance that dissolves a solute to form a solution.Example ;water.

A solution is a uniform mixture of a solute and a solvent.

aq means aqueous

In fiteration the residues are called filtrates but in crystalization the residues are called crystals .

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