Chemistry High School

pls help me with this question

Pls Help Me With This Question

Answers

Answer 1

Answer:

I think its a and c

Explanation:

im smrt

Answer 2
the second question is d. density!

hope this helps ;)

Related Questions

Which situation aUggeata that an experlment han rellable renultn?
A. The experiment use8 a very uimple procedure
B. The experiment generates ldeau for new experimenta
C. The experiment can be repeated with the aame outcome.
D. The experiment aupports the hypothesls.​

Answers

Answer:

Shiny like a limousine

You're spending like a cash machine

Smile, show your golden teeth

That's how you cover up your cavities

You're glowing like a diamond ring

I saw you bought some other things

You're spending like a cash machine

To cover up your insecurities

Don't front, no need ty67t6767

Explanation:

PLZZ HELP!!
An atom has atomic number 11 and mass number 23. How many electrons does the atom have?
23
22
O 12
O 11

Answers

Answer:

12

Explanation:

23-11, why?, because, the difference between atomic and mass number is the neutron number which most a times is equivalent to the electron number.

I am a beginner can someone give me a brainliest to start me out I would appreciate it.
:)

Answers

Answer:

Hi!

The best way you can receive a Brainliest is to help others. You shouldn't focus on receiving a brainliest, rather being glad you helped someone who needed it.

I hope you take this advice and answer a question! :)

The chemical formula for hydrogen
peroxide is H2O2. What is the total
number of atoms in one molecule of
hydrogen peroxide?
A 2
B 4
C6
D 8

Answers

I think that it is 4 because there is 2 hydrogen and 2 oxygen so that equals 4 atoms in total

Which of the following substances is an element? A. water B. table salt C. iron oxide D. hydrogen

Answers

D. Hydrogen

an element is a pure substance that cannot be broken down

Answer:

[tex]\boxed {\tt D. \ Hydrogen}[/tex]

Explanation:

An element has a uniform composition, cannot be broken down by chemical change, every atom has the same atomic number, and can be found on the Periodic Table.

Water is made of hydrogen and oxygen atoms (H₂O) so it is not an element.

Table salt is made of sodium and chloride atoms (NaCl) so it is not an element.

Iron oxide is made up of iron and oxygen atoms, so it is not an element.

Hydrogen is an element. It can be found on the Periodic Table as element H.

The correct answer is D. Hydrogen

BE FIRST TO ANSWER PLEASEEE ASAP! :D

Answers

Answer:

I want to say E or B

Explanation:

!!!WILL GIVE YOU BRANLIEST!!!!

which option is an example of a physical change??

A breaking chemical bonds

B forming chemical bonds

C nuclear decay

D melting a substance

which option is an example of a chemical change
A ironing a shirt

B melting cheese

C grinding powder

D fireworks exploding

Answers

Answer:

D

Explanation:

Melting of ice is a physical change as there no new compound is forming only state is changing So Option D is correct option. For second question Option D is correct option as combustion reaction is taking place.

What is chemical change?

Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same

One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature.  Physical change is just opposite of chemical change. Phase change is an example of physical change.

Thus option D  is correct option in both cases.

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Calculate the average atomic mass of silver if 13 out of 25 atoms are silver -107 and 12 out of 25 atoms are silver -109

Answers

Answer: 107.96amu

Explanation:

(107x.52)+(109x.48)

55.64+52.32=107.96

Help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1

Answers

Answer:

A

Explanation:

Answer:

A. Sorry if wrong, but if i'm right can you mark brailniest pls?

How do clastic sedimentary rocks form?



Solid chemicals in water harden and form rocks.



Fragments of rock are squeezed and cemented together.



Lava cools and hardens into rock.



Plant and animal remains are squeezed and cemented together.
Plz help I give the brainlyest

Answers

Answer: solid chemicals in waterharden and form rocks

Explanation:

Answer:

Fragments of rock are squeezed and cemented together.

Explanation:

I took the test and got the answer below:

How would you determine an atom's charge?

Answers

Answer:

The charge of an atom is the number of protons minus the number of electrons.

what is the orbital notation for silver?

Answers

Answer:

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d10

Explanation:

I think

1s2 2s2 3s2 i think i’m not sure

Which statements describe a human-created mass extinction? Select three correct choices.

Answers

Answer:

Explanation:

where are the choices? I could help but im going to need those choices?

Sorry.

Answer:

-it results from the disappearance of entire species in a short time

-it is caused by the growth of the human population

-it is a long-term change

(A,C, & D)

Explanation:

I got the question right in Edg.

:)

PLEASE APEZ HELP I DONT UNDERSTAND
A teacher placed a plastic cup of warm coffee with a lid in the freezer.
Which statement describes the frozen coffee in comparison with the warm
coffee?
A. The amount of coffee is the same.
B. The speed of the coffee molecules has increased.
C. The temperature of the coffee has increased.
D. The arrangement of the coffee molecules is the same.

Answers

Answer: The answer is A

Explanation:.

which type of matter cannot be broken done into simplier substances by a chemical change

Answers

Answer: Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P 4) or sulfur (S 8) cannot be broken down into simpler substances by these reactions. Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid

Explanation:

Answer:

elements because they are the simplest form of matter so they can't be broken

Explanation:

Hope this helps:)

A rectangle has a width of 7 inches height of 14 inches and a length of 12 inches find it’s volume 

Answers

the answer would be 1,176. you solve by using (L*H*W)

Is Magnesium less reactive than Aluminum ? Yes or No

Answers

Answer:

The answer is no

Answer:

yes

Explanation:

some metals are reactive than others. Example: (a) Magnesium is more reactive than silver. (b) Magnesium reacts with oxygen but silver doesn't because magnesium is more reactive than silver.

please mark me brainliest hope this helps! god bless

What makes the atomic radius change along a period in the periodic table?
A. More electrons in the valence shell make the radius bigger.
B. More protons in the nucleus pull the electrons in, making the
atomic radius smaller.
C. The increased atomic mass makes the atomic radius bigger.
D. More electrons pair in orbitals, making the atomic radius smaller.

Answers

Answer:B

Explanation:

what are the physical characteristics of sand

Answers

Answer:

what do you mean by this ?

Explanation:

Answer:

Sand has a grainy form

Explanation: That's all I know for now

What mass of benzene takes
up
325 mL if its density is
0.874 g/mL?

Answers

Answer:

The answer is 284.05 g

Explanation:

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

mass = Density × volume

From the question

volume = 325 mL

density = 0.874 g/mL

We have

mass = 325 × 0.874

We have the final answer as

284.05 g

Hope this helps you

Who was martin Luther king and how is he celebrite

Answers

Answer: martin luther king jr

Explanation: He led peaceful protests against the discrimination that the people of the United State did against African American men, women, and children. He was a celebrity due to his have "I a dream speech" that he said in front of the lincoln memorial.  Plus he didn't approve of violence when trying to protest African American rights.

Answer:

Who is Martin Luther King and why is he famous?

Exsplanation

A Baptist pastor and civil rights activist, King worked to end legal segregation of blacks in the United States. He gave his famous “I Have a Dream” speech at the August 1963 March on Washington, and won the Nobel Peace Prize in 1964 at age 35 – the youngest man to have received the award.Apr 4, 2018

i must be present in a compound for it considered organic

Answers

Answer:

Carbon

Explanation:

Organic compounds must contain carbon. They also usually contain hydrogen,  oxygen, and often nitrogen and other compounds such as phosphorus.

Nearly all organic compounds contain carbon-hydrogen bonds.

what are parts of this water wheel system?

Answers

Answer: Explanation:

Water wheels have several important parts that work together (see diagram).

*Flowing water (delivered via a channel called a mill race)

*Large wooden or metal wheels.

*Paddles or buckets (arranged evenly around the wheel)

*Axle.

*Belts or gears.

The volume of an unknown liquid is shown in the graduated cylinder. The mass of the liquid is 105 grams.

What is the density of the unknown liquid?

A 3500 g/mL
B .33 g/mL
C 3.0 g/mL
D 3.3 g/mL

Answers

The answer I got is C. 3.0 g/mL .

Answer:

the answer is c

Explanation:

Compare and contrast Transverse Waves and Longitudinal Wave

Answers

there, so you can have choices, though they all mean the same thing.

Identify arrows pointing to nonbonding electrons.

Answers

Answer:

C

Explanation:

Yessir

Please tell me and why ?

Answers

Answer:

Thanks for the points

Explanation:

2. If a person in a wheelchair wanted to get to the second story of a two-story building, would it be easier to
take a short, steep ramp or a long, shallow ramp? Explain.

Answers

Answer:

The short steep ramp would be much harder because you will have to work more against gravity.

Explanation:

The long shallow ramp would be easier to take than the short, steep ramp because the person would have to use more force on the short, steep ramp to push the wheelchair against the force of gravity.

What is an inclined plane?

An inclined plane or a ramp can be defined as a flat supporting surface tilted at an angle, with one end higher than the other, utilized as an aid for raising or lowering a load.

The inclined plane can be defined as one of the six classical simple machines developed by Renaissance scientists. Inclined planes can be utilized to move heavy loads over vertical obstacles.

Moving a body up an inclined plane needs less force than lifting it straight up, at a cost of an increase in the distance moved. The mechanical advantage, the factor by which the force is decreased, is equal to the ratio of the sloped surface's length to the height it spans.

The inclined plane provides the same amount of work to be done with a smaller force exerted over a greater distance. The angle of friction or the angle of repose can be defined as the maximum angle at which a load can rest motionless on an inclined plane because of the friction without sliding down.

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A student has a sample of solid calcium. It is shiny and metallic looking. He squeezes a pipet of concentrated sulfuric acid onto the calcium. Bubbles are produced and the calcium appears to disappear. The test tube gets hot. What kind of change occurred?

Answers

Answer:

Physical change

Explanation:

There are two types of changes: physical change and chemical change. Physical change is defined as the change that changes the physical appearance of the substance and do not affcet the chemical composition of the substance whereas chemical change causes changes in the chemical composition of the susbstance.

The given example shows physical change because solid calcium undergoes sublimation. process in which a solid substance changes into gaseous phase directly without undergoing liquid phase.

Hence, the correct answer is "Physical change".

ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
What does Planck's equation E = h × v determine?

the number of lines on the atomic spectrum for an atom
the color of the lines on the atomic spectrum for an atom
the energy released as an electron moves to a higher orbital
the energy released as an electron moves to a lower orbital

Answers

b

the color of lines

Explanation:

on the atomic spectrum for an atom

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