Answer:
A.) Substance A is less soluble in water than Substance B.
Explanation:
Substance A is less soluble in water than Substance B.
What is Solubility?
This is defined as the ability of a substance, the solute, to form a solution with another substance, the solvent.
We were told that small particles were present in Substance A and none in Substance B which means all was dissolved which is why option A was chosen as the most appropriate choice.
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Which scenario BEST describes how an atom produces light?
electron loses energy as it transitions to lower energy level
electron gains energy as it transitions to lower energy level
electron gains energy as it transitions to a higher energy level.
electron loses energy as it transitions to higher energy level
Answer:
electron loses energy as it transitions to lower energy level
Explanation:
An atom is capable of absorbing and releasing electrons. The atom of a substance is said to be at its GROUND LEVEL STATE when it contains the lowest energy level. However, when it absorbs or takes in energy, it moves to a high energy level called EXCITED STATE. This level is unstable and hence, subject to declination.
Due to the instability of the excited state of an atom, it tends to lose the absorbed electrons and in the process of doing so, it emits or produce light. Therefore, according to this question, light is produced by an atom when the electron loses energy as it transitions to lower energy level i.e excited state to ground level state.
Calculate the mass of 9.75x1021 atoms of helium.
Answer: 99.5475
Hope this helps(:
19. Why should all measurements be done multiple times?
Answer:
Increasing precision with multiple measurements
Explanation:
The more measurements you take (provided there is no problem with the clock!), the better your estimate will be. Taking multiple measurements also allows you to better estimate the uncertainty in your measurements by checking how reproducible the measurements are.
Answer:
All measurements should be done twice to absolutely make sure that you have the correct measurement and to avoid any mistakes if you are like building lets say a table or doing a equation. The saying is measure twice cut once
Explanation:
What is the mass of 1.25 x 10^24 Oxygen atoms? *
1.)32.0 g
2.)1.6 x 10^23 g
3.)O 16.0g
4.)33.2 g
Answer:
4.)33.2 g
Explanation:
(1.25E24/6.022E23)×15.99
List 4 properties of ironically boned compound
Answer:
do u mean ironically? if so here are some:
they're hard and very brittle!!
good insulators
contain high melting points
the form crystals
is mechanical potential or kinetic energy
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
Nitrogen(N) is made up of 99.632% 14N and 0.368% 15N.
The atomic mass of 14N is 14.003 amu. The atomic mass of 15N is 15.000 amu.
What is the average atomic mass of nitrogen?
14.0 amu
14.006 amu
15.00 amu
15.50 amu
Answer:
14.006
Explanation:
The following chemical reaction is balanced, but
the coefficients used are larger than necessary. Rewrite this balanced equation using the smallest coefficients possible.
9Fe(s) + 12H20(I) — 3Fe3O4(s) + 12H2(9)
Answer:
Explanation:
Divide each coefficient by 3:
3Fe(s) + 4H2O(l) ---> Fe3O4(s) + 4H2(g)
The balanced equation using the smallest coefficients possible:
3 Fe (s) + 4 H₂O (I) → Fe₃O₄ (s) + 4 H₂ (g)
What is the balanced chemical equation?A chemical equation can express a chemical reaction in terms of chemical symbols of the substances. A chemical equation exhibits reactants, products, and an arrow representing the direction of the reaction.
A balanced chemical equation exhibits an equal number of atoms of each element is equal on either side of the equation. From the law of conservation of mass, the total mass of the elements on both sides of the chemical equation.
Given, a chemical reaction is balanced, but the coefficients used are larger than required:
9Fe (s) + 12 H₂O (I) → 3 Fe₃O₄ (s) + 12 H₂ (g)
Divide the coefficients by 3 to get the smallest coefficients:
The chemical equation becomes:
3Fe (s) + 4 H₂O (I) → Fe₃O₄ (s) + 4 H₂ (g)
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WILL GIVE BRAINLIEST! URGENT!
In the vinegar and salt solution, is it possible there was some other compound that formed on the egg shell instead of the food coloring? Based on what you know about the charge on the egg shell and the ions in the solution, what might have reacted to form a compound on the shell instead of the food coloring?
Answer: Vinegar
Explanation:
The vinegar and salt affects the shell because food coloring does not affect anything besides the color so the viniger has substances which dissolves thing and the salt just made the vinegar a stronger substance. The Vinegar reactes to form a compund on the shell.
Which material is the best conductor? Which material is the best insulator? Which material would enable you to warm your hands the fastest?
LDPE
HDPE
latex
Mylar
Neoprene
Answer:
Mylar
Explanation:
The metals are good conductors of electricity whereas plastics and wood are referred to as the insulators. Here all the given options are insulators. The best insulator is Mylar. The correct option is D.
What are conductors and insulators?The materials which allow electricity to flow through them is defined as the conductors whereas the substances which resist or do not allow the current to pass through them are called the insulators.
The human body is a best conductor and the conductor has free electrons on their surface. The insulators are solid in nature and they do not have free electrons at all.
The term Mylar is also called the plastic films. It is one of the most recognized and widely used polyester films. It is an excellent electrical insulator which can effectively trap heat.
Here LDPE is a poor conductor of electricity and HDPE is chemically inert. The latex and neoprene are forms of rubber which does not conduct electricity.
Thus the correct option is D.
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Calculate the mass in grams of 8.24 x 1024 molecules of CO2
Answer:
Explanation:
1 mole of any gas contains 6.02 x 10²³ molecules of gas
6.02 x 10²³ molecules of CO₂ contains 1 mole of CO₂
8.24 x 10²⁴ molecules of CO₂ will contain 8.24 x 10²⁴/ 6.02 x 10²³ moles at STP
13.6877 moles
mol weight of CO₂ = 44 g
13.6877 moles of CO₂ = 44 g x 13.6877 g = 602.25 gm.
Which of these best describes the relationship between density and the rate of heat transfer?
A.) Heat transfers between objects regardless of density.
B.) The greater the difference in densities between objects, the slower the heat will transfer.
C.) The less dense the object, the faster the heat will transfer.
D.) The denser the object the faster the heat will transfer.
Answer:
C.) The less dense the object, the faster the heat will transfer.
Plz help!
How is oxygen an element? Explain.
When a carbon atom joints chemically with an oxygen atom it makes carbon monoxide what is the term for carbon monoxide?
a. a molecule
b. a mixture
c. an alloy
d. an element
Answer:
A
Explanation:
I learned this last year
-2(-x-3) - 4x-1=13
gig
Answer:
that means a train railroad track dude
do you mean -2(-x--3) - 4x-1=13 without the gig
Explanation:
what is 0.000980 in scientific notation
Answer:
9.80x10^-4
Explanation:
Answer:
9.80 x 10⁻⁴
Explanation:
The negative means that the decimal place was moved to the right and the exponent tells you how many places it was moved.
Parts working together for one purpose
Answer:
A system is a collection of parts that interact together for a common purpose. But a system is not just any old collection of parts. No single part can do the job alone, and any malfunction or delay is likely to affect the whole system. A body system is a set of body parts that do a particular task.
Explanation:
Explain what is Thermal Energy
Answer:
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process
Explanation:
thermal energy Is just heat
What’s the compound name for V2(S2O3)3
Answer: I HOPE THIS HELPS, HAVE A GREAT EARLY HALLOWEEN
Explanation:
PubChem CID: 1084
Molecular Formula: S2O3(2−) or O3S2-2
Synonyms: Thiosulphate THIOSULFATE ION sulfurothioate UNII-LLT6XV39PY Thiosulfate (S2O32-) More...
Molecular Weight: 112.13 g/mol
Scandium (II) Oxide
A. ScO2
B. Sc2O2
C. ScO
D. ScC2O4
if anyone can sole I give big brain
___. CO(g) +. ___ H2(g) ---> ___ C8H18(l) +. ___ H2O
Answer:
. 8 CO(g) + 17 H2(g) 1 C8H18(l) + 8 H2O
Explanation:
The solution in the beaker was a green color. This is an example of
Answer:
That means its a Transition Metal!
Explanation:
what skill is a scientist using when she listens to the sound that whales make
Answer:
Making observations
Explanation:
As you move left to right across a period, which of the following always increases?
A)
Atomic number
B)
Atomic mass
C)
Atomic weight
D)
Shell number
Answer:
A) Atomic number
Explanation:
how many atoms are in 3Mg(OH)2
In a formula unit of Mg(OH)₂, there are one magnesium ion and two hydroxide ions; or one magnesium, two oxygen, and two hydrogen atoms.
What is Formula Unit ?A formula unit is the chemical formula of an ionic compound that lists the ions in the lowest ratio that equals a neutral electrical charge.
In chemistry, we use chemical formulas to describe the number of elements or molecules that make up a substance.
Therefore , In a formula unit of Mg(OH)₂, there are one magnesium ion and two hydroxide ions; or one magnesium, two oxygen, and two hydrogen atoms.
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which of the following is a part of daltons atomic theory select all that apply
Answer:
Stewie Griffin
Explanation:
Materials
Crayon
Table 2. Investigating crayons and candle when heated
Property before
heating
Property after heating
Answer:
1 - Crayon
Before heating is solid
After heating is liquid
2 - Candle
Before heating is solid
After heating is liquid
Explanation:
Crayon when heated become liquid at a temperature of 115 degrees Fahrenheit or above. When the temperature reached to 120 degrees Fahrenheit for crayon it melts down completely.
When Candle is heated it melts and liquid form of wax falls off which again becomes solid in second after reaching the floor. The melting point of candle is 130 degree Fahrenheit or above.
If someone takes a material that looks pure, and then they do something to it that results
in two separate materials, how can they know if they originally had a pure-looking
mixture of two things that they simply separated into its parts, or if they originally had a
pure material that was a compound that was chemically broken down into new
compounds or elements?
lile
Answer:
The determination of the nature of the combination of the two separate materials in the original material that looks pure is based on the characteristic of the change process they undergo to become two separate materials.
Therefore, they can know if they initially had a mixture or a compound by the following steps;
1) If the two separated materials can be easily remixed to form the original material, then they likely have a mixture of the two separate materials
2) If the process that results in the formation of the two separate materials, involves the absorption or evolves heat or other forms of energy, then the original substance was a compound
3) If the two newly formed materials is seen to be a permanent change, then the original material was a compound
Explanation:
why do covalent bonds melt faster and have low melting points than ionic bonds?
Answer:
Covalent compounds have bonds where electrons are shared between atoms. Due to the sharing of electrons, they exhibit characteristic physical properties that include lower melting points and electrical conductivity compared to ionic compounds.
Explanation:
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
What is the charge on an electrically neutral atom of hydrogen?
+1
+2
0
−1
Answer:
+1
Explanation:
same amount of electrons as protons