Answer:
56.9 amu
Explanation:
Depending on the number of isotopes an element has, the Average atomic mass of isotopes of an element can be calculated using:
(atomic mass of isotope1 × decimal abundance of isotope1) + (atomic mass of isotope2 × decimal abundance of isotope2)
According to this question, two isotopes of element Z were given
- Isotope Z- 56 with atomic mass 56 is 70% abundance. This means that its decimal abundance is 0.70
- Isotope Z- 59 with atomic mass 59 is 30% abundance. This means that its decimal abundance is 0.30
Therefore, average atomic mass of element Z is:
= (56 × 0.70) + (59 × 0.30)
= (39.2) + (17.7)
= 56.9
BE FIRST TO ANSWER PLEASEEE ASAP! :D
Answer:
I want to say E or B
Explanation:
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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
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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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
b
the color of lines
Explanation:
on the atomic spectrum for an atom
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.
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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what is the orbital notation for silver?
Answer:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d10
Explanation:
I think
Which statements describe a human-created mass extinction? Select three correct choices.
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.
:)
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?
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".
What mass of benzene takes
up
325 mL if its density is
0.874 g/mL?
Answer:
The answer is 284.05 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 325 mL
density = 0.874 g/mL
We have
mass = 325 × 0.874
We have the final answer as
284.05 gHope this helps you
Please tell me and why ?
Answer:
Thanks for the points
Explanation:
Which of the following substances is an element? A. water B. table salt C. iron oxide D. hydrogen
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
Is Magnesium less reactive than Aluminum ? Yes or No
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
A rectangle has a width of 7 inches height of 14 inches and a length of 12 inches find it’s volume 
Who was martin Luther king and how is he celebrite
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 am a beginner can someone give me a brainliest to start me out I would appreciate it.
:)
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! :)
Compare and contrast Transverse Waves and Longitudinal Wave
there, so you can have choices, though they all mean the same thing.
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.
Answer: The answer is A
Explanation:.
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.
Answer:B
Explanation:
i must be present in a compound for it considered organic
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.
How would you determine an atom's charge?
Answer:
The charge of an atom is the number of protons minus the number of electrons.
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
Answer:
the answer is c
Explanation:
Help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Answer:
A
Explanation:
Answer:
A. Sorry if wrong, but if i'm right can you mark brailniest pls?
what are the physical characteristics of sand
Answer:
what do you mean by this ?
Explanation:
Answer:
Sand has a grainy form
Explanation: That's all I know for now
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.
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:
what are parts of this water wheel system?
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 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
which type of matter cannot be broken done into simplier substances by a chemical change
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:)
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
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.
Identify arrows pointing to nonbonding electrons.
Answer:
C
Explanation:
Yessir
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
Answer: 107.96amu
Explanation:
(107x.52)+(109x.48)
55.64+52.32=107.96
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
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: