Answer:
Explanation:
Vale, y entonces que ahora???
When she placed her hand on the side of the container, it felt really cold, but it didn't feel that way before. The temperature had dropped by about 30 degrees Celsius. The substance was now grey and crystallin in structure.
Was this a chemical reaction?
Answer the question (in a complete sentence) Provide evidence to support your claim and describe (reasoning/justify) how the evidence supports the claim.
Answer:
this is a physical reaction
Explanation:
Answer:
this is a physical reaction
Explanation:
Which of these best represents the location of the Earth’s core?
A
the pit of a peach
B
the crust of an apple pie
C
the bread in a peanut butter and jelly sandwich
D
the white of an egg
The best represents the location of the Earth’s core is the pit of a peach. Therefore, option A is correct.
What is earth's core ?The earth core is almost entirely composed of metal, notably iron and nickel, in contrast to the crust and mantle, which are rich in minerals. Iron-nickel alloys found in the core are denoted by their chemical symbols, Ni,Fe. The core also contains siderophile, or substances that dissolve in iron.
The Earth's inner core contains even more metal than the outer core. Both are primarily comprised of iron with a small amount of nickel. However, lighter elements like oxygen, carbon, and silicon are also assumed to be present in small amounts in the iron.
This inner core is around 5,400 degrees Celsius hotter than the Sun's surface. The remaining portion is the liquid outer core of the Earth, which is primarily composed of nickel and iron and has temperatures that are similar to surface temperatures before becoming hotter toward the center.
Thus, option A is correct.
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2. Calculate the number of moles of propane you have in 5.78 x1024 molecules of propane = CH
Answer:
Molar mass of C3H8 = C 3 (12.01 g/mol) = 36.03 (g/mol)
H 8 (1.008 g/mol) = 8.064 (g/mol)
44.09 (g/mol)
74.6 g propane x 1 mole propane x 6.022 x 10
23
molecules
44.09 g propane 1 mole propane
= 1.02 x 10
24 molecules propane
Explanation:
What is the mass of 1.9 x 10^22 molecules of CaCO3?
3.2 g CaCO₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
1.9 × 10²² molecules CaCO₃
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of Ca - 40.08 g/mol
[PT] Molar Mass of C - 12.01 g/mol
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of CaCO₃ - 40.08 + 12.01 + 3(16.00) = 100.09 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 1.9 \cdot 10^{22} \ molecules \ CaCO_3(\frac{1 \ mol \ CaCO_3}{6.022 \cdot 10^{23} \ molecules \ CaCO_3})(\frac{100.09 \ g \ CaCO_3}{1 \ mol \ CaCO_3})[/tex]Multiply/Divide: [tex]\displaystyle 3.15794 \ g \ CaCO_3[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
3.15794 g CaCO₃ ≈ 3.2 g CaCO₃
Please answer correctly nobody answers questions like this on brainly. BTW ITS STEM.
Which of the following choices describes an accurate relationship?
Descriptive research typically follows from explanatory research
Experimental research may lead to understanding descriptive research
Case study research typically follows from descriptive research
Observational research may lead to understanding explanatory research
Answer:
I believe your answer is B. Experimental research may lead to understanding descriptive research.
Generally, experimental research is a trial and error method that tests the hypothesis of descriptive research. Descriptive research being the theoretical or studied characters of a topic.
Please let me know if I had this wrong, and I'll do some extra research for you.
help please.
4. Two unknown elements react to a form a single compound. Element 1 is shiny, malleable, and conductive. Element 2 is a non-conductive gas. When they react, what would you expect to be true about the compound produced? (AKS 2a DOK 3)
a.The compound will probably have properties of both elements like a metalloid.
b.The compound will probably have high boiling points and melting points and will be conductive in solution.
c.The compound will probably have low boiling and melting points and will not be conductive in solution.
d.The compound will probably have high boiling and melting points and will not be
Answer:
this is my old account and these still dont have answers
Explanation:
Draw a physical model that shows the reaction of zinc metal and hydrochloric acid (hydrogen chloride).
Zinc + Hydrochloric Acid Zinc Chloride and Hydrogen Gas
Zn + 2HCI - ZnCl2 + H2
“Be sure to label your model to clearly show how you are representing the atoms, how they are rearranged and
that mass is conserved in the reaction.”
If anyone could maybe send me a drawing it’ll be so appreciated! God bless you all :)
Answer:
Zinc + Hydrochloric Acid Zinc Chloride and Hydrogen Gas
Zn + 2HCI - ZnCl2 + H2
Explanation:
Be sure to label your model to clearly show how you are representing the atoms
_____ grams = 9.3 kilograms
Answer:
9300 grams = 9.3 kilograms hope it helps
The outside layer of cells on the top and bottom of a leaf
Answer:
I think it would be the Stomata and the Lower Epidermis
What is the formula for nickel || dichromate
Answer: Cr2NiO7 is the molecular formula for nickel II dichromate.
How does fog rising off water compare to plant growth?
The humidity in the air affects the evapotranspiration rate from the leaf surfaces. ... The use of fog and mist at this time can reduce the air temperature and increase the humidity within the plant canopy without saturating the plant medium. With more oxygen in the root zone, faster rooting occurs.
What kind of scientist would study the the force of a car running into a wall
A. A Chemist
B. A physicist
C. A Botanist
D. A Biologist
Answer:
B. A Physicist
Explanation:
True or false: the moon is the same size as the sun.
Answer:
false
Explanation:
A CANDLE WILL STAY LIT INSIDE THE SPACE SHUTTLE WHEN IT IS ON THE LAUNCH PAD, BUT NOT WHEN IT IS IN ORBIT. WHY?
Answer:
because there is no oxygen in space for it to burn
because all fire need oxygen to burn
Explanation:
_______ mL = 500 cm^3
Answer:
500 mL
Explanation:
500 cm is equal to 500 mL
During spontaneous fission, a nucleus of 25498Cf can produce 11846Pd, four neutrons, and what other nuclide?
Answer: 52Te - Tellurium
Explanation: Radioactivity occurs when an unstable nucleus of an element decompose into a stable element by emitting particles or forms of eletromagnetic energy. There are types of radioactivity and Spontaneous Fission is one of them.
In Spontaneous Fission, the unstable, also called parent, nucleus splits into two smaller nuclei and emitts one or more neutrons.
The reaction spontaneous fission of Cf is represented below.
25498Cf ⇒ 11846Pd + 4n + X
The characteristics of each element of the equation are:
1) The element Cf has atomic mass 254 and atomic number 98.
2) Element Pd has atomic mass 118 and atomic number 46.
3) Neutron is represented as n, has no atomic number and atomic mass 1.
Given these properties, to determine the other nuclide, we have to find out the nuclide's atomic number, as each element in the periodic table has its own atomic number.
At the left side of the equation, atomic number is 98. At the right side, element X's atomic number is
98 - 46 + 0 = 52
In the periodic table, the element with atomic number 52 is Tellurium, whose symbol is Te.
The other nuclide for the spontaneous fission is Tellurium (Te).
blance: Mg + HNO2 → Mg(NO2)2 + H2
Explanation:
Mg + 2HNO2 → Mg(NO2)2 + H2
Answer:
Mg + 2HNO2 → Mg(NO2)2 + H2
Explanation:
The following diagram shows a view of earth . What do the arrows represent
Answer:
how the earth rotates
Explanation:
Answer:
The Diagram shows Earth's rotation! ^^
Explanation:
Orbit and revolution is when the Earth goes around the sun and I'm sure it's not seasons because seasons isn't a movement of Earth.
This question is about energy transfers. Which is the correct definition of conduction.'
(1 Point)
Transfer of thermal energy when particles in a heated fluid rise.
Transfer of thermal energy as a wave.
Transfer of thermal energy by the vibration of particles.
Name the most abundant compound found in air?
Answer:
The two most abundant compounds in air are the gases carbon dioxide, CO2, and water vapor, H2O
Answer:
Nitrogen
Explanation:
Nitrogen is the most abundant compound found in the air. It accounts for about 78% of the air that we breath. It is closely followed by oxygen that accounts for about 21% of the air.
PLEASE PLEASE HELP ITS PAST DUE AND IM CLUELESS ILL GIVE BRAINLIEST TO THE FIRST CORRECT ANSWER
Which of the following would be the evidence of a physical change?
a. change in state of matter
b. precipitate was formed
c. unexpected change in odor
d. formation of bubbles
Answer:
[tex]\boxed {\boxed {\sf A. \ Change \ in \ state \ of \ matter}}[/tex]
Explanation:
A physical change occurs when only the physical properties change. They are generally reversible and no new substances are formed.
However, in a chemical change, the chemical structures and properties change, plus new substances are formed.
Let's analyze each answer choice.
1. Change in state of matter
The state of matter is a physical property, so this is a physical change.
2. Precipitate was formed
A precipitate is a solid formed in a liquid solution. This is a new substance and a chemical change.
3. Unexpected change in odor.
A change in odor is a sign of chemical change.
4. Formation of bubbles
Bubbles signify the formation of gas or a new substance.
So, the best answer choice is A. change in state of matter
Question:
Which of the following would be the evidence of a physical change?
a. change in state of matter
b. precipitate was formed
c. unexpected change in odor
d. formation of bubbles
Answer:
A. Change in state of matter!
Explanation:
How to know it evidence of physical change!
EXPECTED color change.Change in SIZE or SHAPE.Change in state of matter.Reversible.No NEW substance formed!PPPPPPPPLLLLLLLLLSSSSSS HHHHHHEEEEEELLLLPPPPP!!!!!!!!!!!!!!
Answer:
B
Explanation:
The student is not able to move the box in D --> 55N, 0N. Since the net force is 0, it means that no force is being applied. So you will choose answer B from your options.
Hope this helps, thank you !!
Identify the type of reaction
CaCl2 + AgNO3 --> AgCl + Ca(NO3)2
Answer:
It is Double Replacment
Explanation:
They traded bonds.
Balanced Equation is 2AgNO3 + CaCl2 = 2 AgCl +1Ca(NO3)2
How do ions in metals behave. There is picture pls help.
Answer:
metal atoms lose electrons to form positive ions (cations ) non-metal atoms gain electrons to form negative ions (anions )
i agree with this answer from the person above me: Augustlonley
Explanation:
*throws leaves in his face* Hey you wake up!!
Which one of the following is an incorrect orbital notation?
B. 4f
C. 2d
D. 3s
E. 2p
(no 'A')
The answer option which is an incorrect orbital notation is: C. 2d.
A sublevel refers to an energy level that is typically associated with the valence electrons found outside an atomic nucleus.
In Chemistry, there are four (4) main types of sublevel and these includes:
s orbital (sublevel): 3sp orbital (sublevel): 2pd orbital (sublevel): 3df orbital (sublevel): 4fHowever, it is impossible for any atom of a chemical element to have a 2d orbital because electrons are generally located in the s and p orbitals (sublevels) in the second energy level.
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I NEED HELP HERE PLEASE !!!
A gas has a volume of 4 liters at 3 atm. To expand the volume to 7000 ml, what the new pressure
(in atm) have to be?
Answer:
Gas it too expensive I need to get a job. I have no money to use at the atm
Explanation:
if your car is on 7000 ml it has issues and you need to take it to a mechanic.
What mantle is forced down and begins to melt?
HELP!
Answer:
magma
Explanation:
Answer:
magma rises through it.
Explanation:
What is the process where plants make seeds that grow into new plants
Answer:
Plant fertilization
Explanation:
Hope this helps:) Have a great day
Please give Brainliest if could
In metallic bonds, electrons are referred to as electrons.
Answer:
Metallic bonding may be described as the sharing of free electrons among a lattice of positively charged metal ions. The structure of metallic bonds is very different from that of covalent and ionic bonds. ... In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize.
what form of matter has a definite shape and takes up space?
Answer:
If something is in a solid state of matter, it has a definite shape and volume. The volume of an object is the amount of space it occupies. A block of wood placed on a table retains its shape and volume, therefore, it is an example of a solid. If a liquid is poured on that same table, there are very different results
Explanation:
Hello
Answer:
The reliable and correct answer to this question is Solid
Explanation: If something is in a solid state of matter, it has a definite shape and volume. The volume of an object is the amount of space it occupies. A block of wood placed on a table retains its shape and volume, therefore, it is an example of a solid.
