Chemistry High School

what is the answer ??z???????

Answers

Answer 1

Answer:

Females

Explanation:

Hope that helps

Answer 2

Answer:

The answer may be no characters

If I'm right or wrong plz reply to me

Related Questions

a board measures 212 inches how many feet is this?

Answers

Answer: 17.7 feet, Its rounded up since the six repeats.

Short note of modern periodic table

Answers

In the modern periodic table, the elements are arranged in the order of their increasing atomic number. In the modern periodic table, there are seven horizontal rows called periods and eighteen vertical columns (1 to 18) called groups. The arrangement of the periods and groups results in formation of boxes.

Explanation:

If it's help pls give me Brainliest!!

is isopropyl alcohol the same as hydrogen peroxide

Answers

Answer:

Unlike isopropanol, hydrogen peroxide is not a type of alcohol. You might recognize its chemical formula, H2O2, as being similar to that of water (H2O). The difference is that hydrogen peroxide has two oxygen atoms instead of one. That one extra oxygen atom makes it a strong oxidizer.

When a gas is collected over water, the partial pressure of water must be subtracted from the total pressure. If the total pressure was 761 mmHg and the pressure for water is 17.2 torr, what is the pressure due to the gas collected

Answers

Answer is: the partial pressure of the hydrogen 500 mmHg.

p(total) = 523.8 mmHg.

p(water) = 23.8 mmHg.

p(total) = m(water) + p(hydrogen).

p(hydrogen) = p(total) - p(water)..

p(hydrogen) = 523.8 mmHg - 23.8 mmHg.

p(hydrogen) = 500 mmHg.

mmHg or millimeter of mercury is a manometric unit of pressure.

How many moles are present in 1.39 grams of carbon?

Answers

Answer:

0.116 moles

Explanation:

To go from grams to moles, you take the given mass (1.39g) and divide it by the molar mass (which is about 12 grams for Carbon). This gives you the moles. I have attached my work below.

Hope this helps! :^)

PLEASE HURRY Potential energy is described as

Question 1 options:

Stored energy

Friction

Decreasing energy

Movement

Answers

Answer:

Potential energy is the stored energy of position possessed by an object.

Potential energy is described as stored energy. Depending on the relative positions of various system components, stored energy. When a spring is squeezed or extended, its potential energy increases.

What is potential energy ?

Potential energy is the power that an item may store due to its position in relation to other things, internal tensions, electric charge, or other circumstances.

A boulder perched precariously atop a cliff. The rock will be moving if it falls, converting the potential energy to kinetic energy. a longbow's stretched-elastic string.

Potential energy is the energy that is stored in any item or system as a result of its location or component arrangement. The environment outside the object or system, such as air or height, has no impact on it. Conversely, kinetic energy is the force that propels the particles of an item or a system into motion.

Since light has no mass and is an example of electromagnetic radiation, it possesses neither kinetic nor potential energy. The remaining forms exhibit both kinetic and potential energy characteristics.

To learn more about potential energy, follow the link;

https://brainly.com/question/24284560

#SPJ2

what do you mean by blood pressure is 130 19 mm of HG

Answers

Answer:

Hypertension stage 1 is 130-139 mm of HG

How is heat transferred when a person holds a pen that is already at body
temperature?
A. From the hand to the pen
B. Heat is not transferred.
C. In both directions between the pen and the hand
D. From the pen to the hand
SUBMIT

Answers

Answer:

The answer is B.

Explanation:

Heat is not transferred.

Define valence electrons.

Answers

Answer:

Electrons on the outermost shell of an atom. They are responsible for the chemical properties of an atom.

How many particles or molecules of hydrogen are there in one mole of H2O?

Answers

6.022 × 10^23 ×2 = 12.044 × 10^ 23 atoms

Answer:

In one mole of water, there will exist approximately 6.02⋅1023 water molecules. So, there will be a total of 6.02⋅1023⋅2≈1.2⋅1024 hydrogen atoms.

how many outer boundaries does a animal cell have

Answers

Answer:

The plasma membrane.

Explanation:

membrane, in biology, the thin layer that forms the outer boundary of a living cell or of an internal cell compartment. The outer boundary is the plasma membrane, and the compartments enclosed by internal membranes are called organelles.

What are the diffrent types of chemical reactions?

Answers

A chemical reaction is a process that can lead to a change of state, the outcome of a chemical reaction can ultimately lead to the formation of a new substance.

Types of Chemical ReactionsSynthesis reactionsDecomposition reactionsSingle-replacement reactionsDouble-replacement reactionsCombustion reactions.

Learn more about chemical reaction here:

https://brainly.com/question/16923656

A compound contains 70% by mass of iron and 30% by mass of oxygen.
What is its empirical formula?
(A: 0, 16; Fe, 56]

Answers

Answer:

FeO₂

Explanation:

hAVE A nice day

Explanation:

If we assume it's FexOy

Fe : O

70 : 30. (mass ratio)

x:y = 70/56 : 30/16. (mole ratio)

1.25 : 1.875

= 1.25/1.25: 1.875/1.25

= 1 : 1.5

=2 : 3

Therefore It's Fe2O3

Which option is a key point of cell theory? Cells can repair neighboring cells, but not themselves.Cells can repair neighboring cells, but not themselves. , , Cells are the basic structural unit of all living organisms.Cells are the basic structural unit of all living organisms. , , All cells that make up an organism are similar to each other.All cells that make up an organism are similar to each other. , , Some cells can burn food molecules to release energy, but some cannot.

Answers

Answer:

Cells are the basic structural unit of all living organisms.

Explanation:

Hope this helps, but i'm unsure if it would be multiple choice or not.

Two chemical reactions are shown:
A. Ca(OH)2 - CaO + H2O
B. 4K + O2 + 2K20
Which statement is true?

A. Both are synthesis reactions
B. Both are decomposition reactions
C. A is a synthesis reaction, and B is a decomposition reaction
D. A is a decomposition reaction, and B is a synthesis reaction

Answers

Answer: A is a decomposition reaction, and B is a synthesis reaction

Explanation: the first equation shows the reactant breaking up into 2 parts aka decomposition and equation 2 shows the reaction being combined into one part, aka synthesis. hope that helps!

Answer:

Answer d

Explanation:

What does it mean when an element turns into an ion?.

Answers

Answer:

When a neutral atom gains one or more electrons, the number of electrons increases while the number of protons in the nucleus remains the same. The result is that the atom becomes an anion—an ion with a net negative charge.

Explanation:

Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements.

C :
H:
N:

O:
P:
CI:

Answers

Answer:

Look at the screenshot below.

Those are your answers!

Good Luck.

Explanation:

The number of valence electrons for neutral atoms is the same as the number of the atom's main group.A periodic table element's column can be used to determine its main group number.For instance, carbon, which belongs to group 4, has four valence electrons.

Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements?

This rule states that each group of elements has one valence electron, two valence electrons in group 2, three valence electrons in group 13, four valence electrons in group 14, and so on. C : Six electrons make up the atom of carbon: four valence (outermost shell) electrons in the 2s and 2p orbitals, and two inner shell (core) electrons in the 1s orbital. H : As the initial element, hydrogen has an electron configuration of 1s1.Its valence shell only contains one electron.The outermost electrons or those with the highest energy level are called valence electrons. N : The periodic table's Group 15 is headed by nitrogen, which has either 3 or 5 valence electrons. O : On the periodic table, column 6 contains oxygen (symbol O).Its valence electrons number six.To obtain an octet, two bonds must be created. Ci : If chlorine removes one of its seven valence electrons, it will have eight (an octet).When chlorine gains one electron, its electron configuration resembles that of argon.If chlorine had given up all seven of its valence electrons and sodium had taken them, the octet rule would have been met.

To learn more about periodic table refer

https://brainly.com/question/25916838

#SPJ2

What is the amount, in mol, of 15g of carbonate ions, C03^2-

Answers

24 electrons.............

In your own words, explain why it is necessary to include only one chain-terminating/ synthesis-terminating nucleotide in each well of the electrophoresis instrument.

Answers

Answer: DNA sequencing methods employ chain termination nucleotides. Furthermore, if two chain-terminating nucleotides are employed in the same well, determining which strand is ended by which dideoxynucleotide will be impossible.

(its my own words, but i did search it to get this answer, hope it helps!)

Chain termination nucleotides are used in DNA sequencing techniques.Furthermore, it will be impossible to tell which strand is terminated by which dideoxynucleotide if two chain-terminating nucleotides are used in the same well.

Why is it necessary to include only one chain terminating synthesis terminating nucleotide?Only a limited subset of molecules will randomly incorporate dideoxynucleotides when the terminating nucleotide is added in small amounts. All permutations of termination can be achieved because different chain-terminating nucleotides are utilized in the four sequencing procedures.

What is a synthesis terminating nucleotide?Synthesis comes to an end when a ddNTP is added to a chain of nucleotides. This is due to the ddNTP molecule's absence of the 3' hydroxyl group needed to bind to the subsequent nucleotide in the chain.

What is chain termination method of DNA sequencing?The "chain termination method," often known as Sanger sequencing, is a technique for figuring out the nucleotide sequence of DNA. The Sanger Sequence is a method that was created in 1977 by two-time Nobel laureate Frederick Sanger and his colleagues.

What is the purpose of terminating the replicated strands?When two replication forks with opposing polarities come together and combine to form two independent, fully formed double-stranded DNA molecules, DNA replication is stopped.

Learn more about chain-terminating here:

https://brainly.com/question/3476061

#SPJ2

What will happen to the density of the water if i put salt in it.

Answers

Answer:When salt is dissolved in fresh water, the density of the water increases because the mass of the water increases.

Explanation:

Which of the following shows a valid combustion reaction?

2Al + 2O2 → 2AlO + O2
C2H4 + 3O2 → 2CO2 + 2H2O
2CH4 + O2 → 2CO + 4H2
Ca + O2 → CaOH

Answers

Answer: C2H4 + 3O2 → 2CO2 + 2H2O

Explanation:

2Al + 2O2 → 2AlO + O2 Not Balanced Properly: 2Al + O2 = 2AlO

C2H4 + 3O2 → 2CO2 + 2H2O Looks Good

2CH4 + O2 → 2CO + 4H2 Not Correct: CO should be CO2

Ca + O2 → CaOH Not Balanced and No source for the H

Answer:

2H4+3O2 →2CO2+2H2

Explanation:

What is the correct formula for tetraphosphorous octaoxide
P4O10
P4O8
Ph4O8
P5O8

Answers

P_4O_8

How?

Let's learn how to create name of compound from its name.

Look below for root words

2-di 3-tri4-tetra5-pent6-hex7-hept8-oct9-non10-dec

Hence formula of the compound is P4O8

What is the density of an object that has a mass of 149. 8 g and displaces 12. 1 ml of water when placed in a graduated cylinder?.

Answers

Answer:

12.38 g/mL

Explanation:

The density of a substance can be found by using the formula

[tex]d = \frac{m}{v} \\ [/tex]

m is the mass

v is the volume

From the question

m = 149.8 g

v = 12.1 mL

We have

[tex]d = \frac{149.8}{12.1} = 12.380165... \\ [/tex]

We have the final answer as

12.38 g/mL

Hope this helps you

an atom with 3 protons that loses an electron becomes…

Answers

Answer:

A +1 Ion of Lithium

Explanation:

Lithium has the atomic number of 3, therefore it has 3 protons

An electron has a negative charge, so losing an electron gives an atom a positive charge.

Answer:

Positive 1 ion of lithium

Explanation:

hope this helps!

What is the IUPAC name for NH3? ammonia mononitrogen hydride mononitrogen trihydride nitrogen trihydride.

Answers

The IUPAC name for NH3 is Ammonia

The IUPAC name is also known as (International Union of Pure and Applied Chemistry) and it is a standardized system by chemical scientists for naming chemical compounds.

The IUPAC name for NH3 is Ammonia. Ammonia is a colorless gas with a stifling odor that is an exceedingly unpleasant pungent smell. It dissociates quickly in water to generate ammonium hydroxide, which can irritate and burn the skin.

It serves an agricultural purpose such as fertilizer.It is also used for the production of plastics, textiles, insecticides, etc.

Learn more about the IUPAC naming system here:

https://brainly.com/question/23036094?referrer=searchResults

PLZ HELP!!!

What are 3 genetic disorders caused by either missing or extra chromosomes? In your own words, provide a brief short explanation of what causes the disorder and some potential symptoms.

BEST ANSWER WILL BE MARKED AS BRAINLIEST!!!

Answers

Answer:

Humans have 23 pairs of chromosomes.

A trisomy is a chromosomal condition characterised by an additional chromosome.

A person with a trisomy has 47 chromosomes instead of 46.

Down syndrome, Edward syndrome and Patau syndrome are the most common forms of trisomy.

Explanation:

An electrochemical cell operates because the electrodes in the two half-cells differ in their electrical potential. A metal electrode composed of ______ reducing agent will have a greater electrical potential to push electrons toward the electrode composed of a ______ reducing agent.

Answers

A metal electrode composed of strong reducing agent will have a greater

electrical potential to push electrons toward the electrode composed of a

weak reducing agent.

Strong reducing agents are compounds which donates or loses electrons

with a corresponding increase in the oxidation state. Weak reducing agents

can also be referred to as oxidizing agents and they accept the electrons

from the strong reducing agents which results in a reduction in the oxidation

state.

The strong reducing agent has a greater electric potential which aids the

electrons being pushed towards the electrodes with a weak reducing agent.