Answer:
A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust.
Explanation:
Answer: when one chemical substance is transformed into one or more different substances.
Explanation:
Identify arrows pointing to nonbonding electrons.
Answer:
C
Explanation:
Yessir
Identify the atom
H₄
CH₄
N
Answer:
Organic Molecule.
Explanation:
Any molecule with C atoms and H atoms are organic molecules in chemistry.
Examples could be C₄H₅, C₉H₁₈O₆, C₅H₁₂N.
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
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
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:
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
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.
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
what is the orbital notation for silver?
Answer:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d10
Explanation:
I think
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:.
Help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Answer:
A
Explanation:
Answer:
A. Sorry if wrong, but if i'm right can you mark brailniest pls?
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".
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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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.
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What is the difference between a compound and a mixture?
Group of answer choices
A compound is just a mixture of elements.
A mixture can be physically separated into its components; a compound cannot be physically separated into its components.
The components of a mixture do not have the same properties individually as they do when mixed.
A compound can be physically separated into its components; a mixture cannot be physically separated into its components.
Answer:
Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances. Compounds can be of three types, which are: covalent compounds, metallic compounds and ionic compounds.
Answer:
The answer is a mixture can be physically separated into its components; a compound cannot be physically separated into its components.
A rectangle has a width of 7 inches height of 14 inches and a length of 12 inches find it’s volume 
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
I need help with that box
I hope this helps.
the first line would be SN, 50, 50, 69
second line would be PT, 78, 78, 117
third line would be MO, 42, 42, 54
fourth line would be NI, 28, 28, 31
fifth line would be U, 92, 92, 146
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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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Please tell me and why ?
Answer:
Thanks for the points
Explanation:
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:
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:
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.
Which of the following statements regarding the moon and Earth is correct? Question 9 options: A) The moon is older than Earth by approximately 300 million years. B) Earth is tidally locked, while the moon spins on its axis. C) Earth and the moon have nearly the same mass. D) Earth and the moon are nearly the same age.
The statement 'The moon is older than Earth by approximately 300 million years' is True (Option A).
When did the Moon form?The Moon formation refers to the geological period of time in which our natural satellite emerged as an independent celestial body.
It has been proposed that the Moon emerged first compared to the Earth (approximately 300 million years).
In conclusion, the statement 'The moon is older than Earth by approximately 300 million years' is True (Option A).
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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! :)
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Answer:
I want to say E or B
Explanation:
Compare and contrast Transverse Waves and Longitudinal Wave
there, so you can have choices, though they all mean the same thing.
How would you determine an atom's charge?
Answer:
The charge of an atom is the number of protons minus the number of electrons.
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