Answers
Answer:
The answer should be A
Explanation:
Answer:
Leaving a Copper penny in vinegar until it turns green
Explanation:
the others are physical changes. when copper penny is put in vinegar, a reactive oixde layer is formed which is green in colour. namely, Cu(II) acetate.
The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes. Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.
Related Questions
how many barr bodies are found in a normal human female nucleus
Answers
Answer:
One Barr body
Explanation:
pls help noww
Just want to see who's the smartest here
promise to tag u as brainliest
Answers
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1. The equation representing the equation is ~
[tex] \mathrm{Na + Cl\rightarrow NaCl}[/tex]
The given reaction is a redox reaction because there's a transfer of electron from Sodium (Na) to chlorine (Cl)
where sodium is oxidized (due to loss of electron) and chlorine get reduced (due to gain of electron).
2. Sodium is a highly reactive element which belongs to the 1st group of periodic table, hence it can catch fire if it is kept free in atmosphere. so in order to prevent that it is stored in kerosene oil, which doesn't let Sodium come in contact with air .
answer pls ASAP will mark the brainliest
Answers
For me that is the first :
Both the identity and the properties of a substance change.
Someone pls help me I will make you brain
Answers
Answer:
The answer is true. ozone in the stratosphere is a toxic pollutant that can cause tightness or shortness of breath.
During the work-up step, aqueous hydrochloric acid is added to the reaction and a gas is observed. what is the composition of the gas?
Answers
The gas likely composed of Hydrogen
Hydrogen is one of the most abundant elements that exist in the world and its natural state is a gaseous state. This means hydrogen can be in other states such as liquid or solid if bonded with other elements but it is not its natural state.
For example:
Ice is solid and it contains both hydrogen and oxygen
Hydrochloric acid is usually liquid and it contains Chlorine and Hydrogen
Because of this, during reactions Hydrogen has a tendency to break its bonds with other elements and return to its gaseous state. Based on this, it is likely the gas in this reaction is hydrogen.
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The photo shows a seismograph. It is a machine that detects earthquakes
and makes graphs of the waves made by them.
What is the medium of the wave being detected by this seismograph?
A. Paper
B. Ink
C. Air
D. Rock
Answers
Answer:
D is the correct option.
Explanation:
A seismograph detects seismic waves which travel through the Earth, that is mainly rock(taking from the options given)
Answer:
It is just rock!
Explanation:
What is a pure substance that contains atoms of more than one element called?
O a mixture
O a precipitate
O a compound
O a solution
Answers
Answer:
Pure substances made of more than one element are called. compounds. The chemical formula for a molecule of nitrogen is. N2. The balanced equation for the formation of water from the elements hydrogen and oxygen is.
Answer:
A compund
Explanation:
Did test got 100
Which choice lists the different types of change in order of increasing energy
a) chemical, nuclear, physical
b) chemical, physical, nuclear
c) physical, chemical, nuclear
d) nuclear, chemical, physical
Answers
Answer:
Your answer is D.
Explanation:
Answer:
I would answer D
Explanation:
I might be wrong though
"A base is a substance that produce OH-ions." Which definition of a base is this?
A. Titration
B. Bronsted-Lowry
C. Arrhenius
D. Alkali
Answers
Answer:
C. Arrhenius
An Arrhenius base is a substance that dissociates in water to form hydroxide (OH–) ions. In other words, a base increases the concentration of OH– ions in an aqueous solution.
Explanation:
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What describes a chemical reaction?
Answers
Answer:
A chemical reaction is a process where two different substances or elements are mixed together. They then undergo some sort of chemical change to become a different substance altogether.
Explanation:
how many atoms of neon are present in 1.30 moles of neon?
Answers
Answer:
7.83 x 10^23 atoms
Explanation:
What element is in period 4 and is in group 18
Answers
Answer:
Krypton is the element
Symbol: Kr
When you cut an apple, what are the chemical changes and physical changes when cutting it?
Answers
Answer:
cutting of an apple is both physical and chemical change
because cutting a apple, the size and shape of the apple changes. it will be a chemical change because after cutting an apple, the color apple changes when left open
.
Which of the following describes Pluto?
1. asteroid
2. moon
3. planet
4. dwarf planet
Answers
Answer:
4. dwarf planet
Explanation:
Can liquid methane change phases?
Answers
Answer: Methane is a gas at standard conditions.
Explanation: However, at low temperature and/or high pressures the gas becomes a liquid or a solid.
Answer: yes
Explanation:
Which of the following has electrons in a d orbital?
Mg
Si
Cr
Са
Answers
Cr is the only element listed that is located in the d-block of the periodic table.
d. Period 3 element with 6 valence electrons
Answers
Answer:
Sulfur is an element is Period 3 with 6 valence electrons.
Which chemical family below would the element iodine most likely belong to?
Family D
Family C
Family A
Family B
Answers
Answer:
it is option A
Explanation:
Best of luck in whatever you are doing
Which element is named after a scientist?
Answers
PLEASE HELP!!
What kind of metal is Co?
Alkali Metal
Transition Metal
Alkaline Earth Metal
Answers
Answer:
I believe Cobalt is a Transition Metal.
Answer:
answer is transition metal
Nguyên tử nguyên tố sắt có 26e
a. Viết cấu hình e của sắt
b. Sắt thuộc nguyên tố s,p,d,f
Answers
Answer:
1s2 2s2 2p6 3s2 3p6 3d6 4s2
Explanation:
If a proton is added to the nucleus of germaium what out comes would acure
Answers
HOPE THIS HELPS YOU!!!!
Write down the names, physical properties, and inertness of NOBLE GASES ( group no. 8)
Note:
*Please don't copy from anywhere
*50 POINTS!!!!!!!!
Answers
Answer:
There's No Answer Im Sorry
WHAT IS THE MIXTURE OF BOILING POINT AND MELTING POINT?
(ive been stuck on that question for AGES)
Answers
Answer:
A pure substance has a sharp melting point (melts at one temperature) and a sharp boiling point (boils at one temperature). A mixture melts over a range of temperatures and boils over a range of temperatures. Homogeneous mixtures are called solutions.
Answer:
What is it has fixed boiling point substance or mixture? A pure substance has a sharp melting point (melts at one temperature) and a sharp boiling point (boils at one temperature). A mixture melts over a range of temperatures and boils over a range of temperatures. Homogeneous mixtures are called solutions.
Explanation:
lol they got it from go ogle
Which elements are present in all organic compounds? 1. Hydrogen and oxygen 2. Nitrogen and Carbon 3. Nitrogen and oxygen 4. Hydrogen and Carbon
Answers
Answer:
my answer is num:3 Hydrogen and oxygen.
The diagram shows the box for an element in the periodic table.
What is the atomic mass of the element shown?
A. 11
B. 23.0
C. 34.0
D. 12
Answers
A
Explanation:
sodium is a chemical element with the symbol and the atomic number is 11
(WORD BANK - Neap, gravitational, greatest, moon, high, Spring, low, Sun)
Ocean tides are caused by the ______________ pull of the _______ and the _______. The moon has the __________ effect on the tides. When the Sun, moon and earth are in a straight line, we
have __________ tides. When the Sun, moon and earth are at right angles we have _________
tides. Spring tides are especially _________ tides while neap tides are especially _________tides.
Answers
Answer:
Ocean tides are caused by the gravitational pull of the moon and the sun. The moon has the greatest effect on the tides. When the Sun, moon, and earth are in a straight line, we have Neap tides. When the Sun, moon, and earth are at right angles we have spring tides. Spring tides are especially high tides while neap tides are especially low tides.
Explanation:
brainliest please. . . <3
Help me figure out these I’ll mark u brainliest
It’s science
Answers
Answer:
1. organic
2. plants
3. algae?
4. oxygen
5. Uses
Which of the following is a liquid someone help!!!!!
Answers
THE ANSWER IS ON THE PICTURE HOPE IT HELPS
Distinguish the endothermic and exothermic energy changes associated with ionic bond formation, and relate it to stability
Answers
Answer:
When ionic compounds are formed, energy is released which is exothermic energy. If the energy released during bond formation is reabsorbed, the ionic bond holding the positive ions and negative ions together will break apart which is endothermic energy.
Explanation:
The formation of an ionic crystal lattice from its constituent ions is an exothermic process.
Endothermic changes are energy changes in which energy is absorbed while exothermic energy changes are those energy changes in which energy is evolved.
During the formation of an ionic bond, the metal looses electron(s). This is an endothermic process. The nonmetal accepts electrons. This is an exothermic process.
When the ionic crystal is formed, energy is given out because the energy of the lattice is less than the energy of the isolated ions. This heat change is exothermic.
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