Chemistry High School

An atom has a mass number of 9 and 5 neutrons What is its atomic number?
A. 14
B. 11
C. 19
D. 4

Answers

Answer 1

Answer:

D. 4

Explanation:

mass number - number of neutrons = number of protons

Related Questions

A chemical reaction that has the general formula of AB + CB + Als best classified as a
reaction.
8

Answers

Replacement  I think, hope this helps ;)

Explanation:

Answer:

Replacement

Explanation:

There is usually only one correct method that can be used to solve a problem true or false

Answers

The answer is false

The fictional element, marvellium has 4 isotopes with mass numbers of 21, 22,24, and 28 amu. Each isotope is found in equal amounts in nature. What number is closest to the average atomic mass of marvellium

Answers

Answer:

The answer to that question is 24 AMU.

Explanation:

I know this because i got the answer correct on the quiz. To get the average, you just add the 4 atomic masses given to you together then divide by 4.

Determine the Molar mass of NI3

Answers

Answer:

The molar mass of [tex]NI_{3}[/tex] is 394.719 g/mol.

Explanation:

This was on my periodic table.

which example is a body fossil
(A) an ornithopod track
(B) shrimp burrow
(C) dinosaur footprint
(D) dinosaur bone

Answers

Answer:

dinosaur bone

Explanation:

fossils are remains from a certain organism or trace of any living thing from the past.

Answer:

D Dinosaur bone

Explanation: I took the quiz

Can someone help me with this ASAP?
How many energy levels does the element helium have?

I appreciate the help!

Answers

The answer would be
2

Baby steps in science occur small bits of__ gradually accumulate

Answers

Answer:

Baby steps in science occur small bits of__ gradually accumulate

Explanation:

Baby steps in science occur as small bits of evidence gradually accumulate. The evidence lets scientists refine and expand on earlier ideas.

How is aluminum an example of extensive
property?

Answers

Answer:

If the property depends on the amount of matter present, it is an extensive property. The mass and volume of a substance are examples of extensive properties; for instance, a gallon of milk has a larger mass and volume than a cup of milk.

Explanation:

11. A 150 gram sample of radon-222 goes through alpha decay. The half-life of
radon-222 is 3.82 days. How much radon will be left after 3.82 days?

Answers

Answer:

The correct answer is - 75 grams.

Explanation:

Half-life is the amount of time that is used by the given amount of substance or element to make it half of the initial amount of a particular radioactive substance.

Equation for alpha decay for radon

[tex]^222_{86}Rn\Rightarrow^{218}_{84}Po  [/tex]

we need to calculate the left amount of radon after given time

using formula half life

[tex]N(t)=N_{0}e^{-\lambda t}[/tex]

[tex]\lambda =\dfrac{0.693}{3.82}[/tex]

[tex]\lambda=0.1814[/tex]

[tex]N(3.82)=150\times e^{-0.1814\times3.82}[/tex]

[tex]N(3.82)=75.0\ g[/tex]

Thus, the left amount of radon is - 75 grams.

which element has more valence electrons; Rb or Ca?

Answers

Ca has 2 valence electrons while Rb has 1. The valence electrons are the electrons in the outer ring. I hope that helps you in solving other questions.

Answer:

kk

Explanation:

im here

Which formula represents a convalent compound


. H2O2

.CaO

.MgS

.NaCl

Answers

Answer:

H₂O₂ is a covalent compound

Answer:

Is H₂O₂

Explanation:

So That Answer

what happens before, during, and after a chain reaction.

Answers

A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons, and the process repeats. The process may be controlled (nuclear power) or uncontrolled (nuclear weapons).

pls mark as brainliest

The Density of this log is 1.75g/cm3. If we cut this log in half, what is the density of the log? Make sure to show your work and explain your answer.

Answers

Answer:

The density remains the same

Explanation:

The density remains the same because cutting the object in half will divide the mass & volume by the same amount. The density cant be changed no matter what happens to it.

what families do you have in your chart

Answers

Answer:

Families in chart is offsprings made from molecules

Explanation:

Because babies are made from the offspring on which your eye colors,hair colors and etc.

What are the parts of an electron configuration: 1s22s22p63s2 ?
1,2,3 = shell?
s, p =
2,2,6,2 =

Answers

Explanation:

electronic confirmation=1s^2,2S^2,2P^6,3S^2

atomic no.is 12 therefore :- this is magnesium

Period=3

Block=s-block

Group=II A

What elements were formed in Nuclear fusion?

Answers

Answer:

tritium and deuterium are combined and result in the formation of helium

Which of the following has 62 neutrons, 46 protons, and 46 electrons?​

Answers

The answer is Silver (Ag)

Which gas is used by humans in process of cellular respiration

Answers

Answer:

Humans use Oxygen or O2 to begin the process of cellular respiration, and then when this process is finished it gives of carbon dioxide or Co2

Explanation:

Answer:

oxygen is used by human in the process of cellular respiration

Explanation:

because cells uses oxygen to break down sugar

The nucleus of the cell

a
Is found inside the chloroplast
b
Is found inside the membrane of a bacterial cell
c
contains DNA and controls the cell's activities

Answers

Answer:

c

Explanation:

it is c because that is the andwer

Changes in a state of matter include?

Answers

Answer: melting, freezing, sublimation, deposition, condensation, and vaporization

Metamorphic rocks can form from other metamorphic rocks. t or f

Answers

Answer:

True

Explanation:

The process could repeat it self and the outcome would stay the same.

why is helium heavier than hydrogen​

Answers

Helium has more protons making it heavier by one atomic mass.

Answer:

because it's has an additional electron. hydrogen is just made up of one proton

does changes in state of matter indicate a chemical change.

Answers

Answer:

No, changes in matter are physical changes.

Explanation:

6. I have a mixture of tomato sauce,
sugar, and carrots. I bring a
magnet close by. What does the
magnet pick up and what is left
behind?

Answers

Answer:

All the items in the mixture will not be picked up by the magnet and therefore, all of them would be left behind

Explanation:

Ferromagnetic materials are materials that can become magnetized and are also readily attracted to a magnet or by a magnetic field. Examples of ferromagnetic materials includes, iron, cobalt, and nickel, and their alloys

Ferromagnetic materials are mainly metals while all materials exhibit some form of magnetism including diamagnetism and paramagnetism, but these are not the type of magnetism seen in everyday life

Therefore, since neither of the tomato sauce mixture, the sugar or the carrots are not ferromagnetic materials none of them will be picked up by the magnet.


An ice cube has a volume of 12cm3 and a mass of 11g. What is the density of the ice?

Answers

Answer:

find the volume of the ice cube then using the formula density=mass over volume calculate the density okay

The density of the object is mass per unit volume. Density is directly proportional to mass and inversely proportional to volume. . The density of the object is 0.916 g/ cm3

What is density?

Density is defined as mass per unit volume of the object. If the mass of the object increase then the density will increase. If the volume of the object decrease then the density will increase.

Density = Mass / volume

             = 11 g/ 12 cm3

             = 0.916 g/ cm3.

Therefore, The density of the object is mass per unit volume. Density is directly proportional to mass and inversely proportional to volume. The density of the object is mass per unit volume. The density of the object is 0.916 g/ cm3.

To learn more about density, refer to the link:

https://brainly.com/question/15164682

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If a 91.3 g piece of aluminum has a density of 2.7 g/cm3, what is its volume in cubic centimeters?

Answers

Answer:

The answer is 34 cm³

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\ [/tex]

From the question

mass of aluminum = 91.8 g

density = 2.7 g/cm³

It's volume is

[tex]volume = \frac{91.8}{2.7} \\ [/tex]

We have the final answer as

34 cm³

Hope this helps you

The atomic weight of iodine is less than the atomic weight of tellurium. However, Mendeleev listed iodine after tellurium in his original periodic table because he suspected the atomic weights for these elements were inaccurate. What was Mendeleev's reason for this suspicion?

Answers

Answer:

The reason for the suspicion was because the manner in which iodine reacted chemically as well as its other chemical properties, indicated that it belonged in the same group as chlorine and bromine, while the much heavier tellurium should be placed in the previous group

The suspicion was proved to be correct when the atomic number of tellurium was found to be 52 and that of iodine was found to be 53 by later scientists

Explanation:

A wooden block has a mass of 562 g and a volume of 72 cm 3 . What is the density?

Answers

Density = mass / volume
Substitute

And is 7.80555 g/cm cube

The density of the wooden block is 7.81 g/cm³

Density is related to mass and volume by the following equation:

Density = mass / volume

With the above formula, we can obtain the density of the wooden block as follow:

Mass of wooden block = 562 g

Volume of wooden block = 72 cm³

Density of wooden block =?

Density = mass / volume

Density = 562 / 72

Density = 7.81 g/cm³

Therefore, the density of the wooden block is 7.81 g/cm³

Learn more: https://brainly.com/question/24700775

78 POINT PLEASE HELPPP!!!!Which energy source is a nonrenewable resource?
O oil
O sun
O trees
O wind

Answers

Answer:

Oil?

Explanation:

Answer:

oil

Explanation:

its nonrenewable

Which two particles are always found in equal number in neutral atoms

Answers

Answer:

When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.

Answer:

protons and electrons

Explanation:

A P E X

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