Answer:
1.38 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{8.30 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{8.3}{6.02} \\ = 1.3787...[/tex]
We have the final answer as
1.38 molesHope this helps you
Sugar solution and steel are both mixtures. Which statement correctly compares them?
A) Both sugar solution and steel are separable mixtures.
B) Both sugar solution and steel are inseparable mixtures.
C) Sugar solution is a separable mixture but steel is an inseparable mixture.
D) Sugar solution is an inseparable mixture but steel is a separable mixture.
Which color of light has the greatest energy
Answer:
violet
Explanation:
Waves with a short wavelength have the most energy. Red waves have a relatively long wavelength (in the 700 nm range), and violet waves are much shorter - roughly half that. Because violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy (google)
Answer the questions below:
1.Give an example of something that has matter.
2.Give an example of something that doesn't have matter.
3.What is the difference between an chemical change and a physical change?
4.What 2 main kind of changes can you observe involve chemical reactions?
5.What is a precipitate?
6.What is the difference between an endothermic reaction and an exothermic reaction?
Answer:
1. An apple is something that has matter.
2. Light does not have matter. It neither has mass or takes up and space.
3. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
4. A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!
5. A precipitate is a solid that forms out of solution.
6. In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.
Explanation:
Matter is anything that has mass and takes up volume.
Answer:
1. some thing that has matter is an apple, a person,a table. things that does 2.not Light.,Sound.,Heat.Energy.Gravity.Time.A Rainbow.Love.
3. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
4.A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!
5.Precipitate: In chemistry, a solid formed by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid. In meteorology a precipitate is liquid or solid water (rain, snow, etc.) falling from the sky.
6.n simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.
hope this help plz give me a thxs and brainlyest and a five star thx and you welcome let me know if this helped
This is the quetion answer it fast pls
Answer:kingdom 1 i think
Explanation:
which of the following has the largest atomic radius mg, be, cl, c, na
Answer:
na
Explanation:
because it has more atomic radius in it
HELP,QUIZ!!!
Why does your tile floor feel colder on your feet than carpet?
options
-because the tile is a lower temperature than carpet
-because tile conducts energy faster than carpet
-because tile has a smoother texture than carpet
-because tile conducts energy slower than carpet
Answer:
because tiles conduct energy faster than carpet
Explanation:
when it is winter tiles are as coled as ice an carpet is barley coled when left a tile out in the sun I would burn like a stove but if you left a carpeted it would be warm
explain how to balance the chemical equation and classify its reaction type.
___C5H5 +___ Fe ⟶ ___Fe(C5H5)2
Answer: The balanced chemical equation is given below.
Explanation:
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
The balanced chemical equation follows:The balanced chemical equation follows:
On reactant side:
Number of carbon atoms = 10
Number of hydrogen atoms = 10
Number of iron atoms = 1
On product side:
Number of carbon atoms = 10
Number of hydrogen atoms = 10
Number of iron atoms = 1
So, the balanced chemical equation is given above.
Answer:
#1. Balanced equation: 2C₅H₅ + Fe → Fe(C₅H₅)₂
#2. Type of reaction: Synthesis reaction
Explanation:
Balanced equations are equations that obey the law of conservation of mass.
When an equation is balanced the number of atoms of each element is equal on both side of the equation.
Equations are balanced by putting appropriate coefficients on the reactants and products.
In our case, we are going to put coefficients 2, 1 and 1.
Thus, the balanced equation will be;
2C₅H₅ + Fe → Fe(C₅H₅)₂
This type of a reaction is known as synthesis reaction, in which two or more reactants or compounds combine to form a single compound or product.
What are the similarities and differences between unicellular and multicellular organisms?
Answer:
Unicellular organisms contain one cell and all of their functions are based on that one cell whereas multicellular organisms contain more than one cell and their functions are divided amongst different cells like nervous cells, cardiac muscle cells etc.
Explanation:
While multicellular creatures have numerous cells, unicellular organisms only have one.
What are unicellular organisms?A single cell makes up a unicellular creature, also referred to as a single-celled organism, as opposed to a multicellular organism, which is made up of numerous cells.
Prokaryotic and eukaryotic organisms are the two broad categories into which all organisms fall.
Unicellular organisms only have one cell, whereas multicellular species have many. While multicellular creatures carry out various cell functions through a clearly defined set of cells, unicellular organisms combine all cellular functions into one cell.
Multicellular and unicellular organisms are comparable in that they exhibit nearly all of the life's processes and functions, including metabolism and reproduction.
They have RNA and DNA, which can show a variety of lifestyles vital to the majority of the ecosystem in which we currently live.
Thus, these are some similarities and differences between unicellular and multicellular organisms.
For more details regarding unicellular organisms, visit:
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Why does mass decrease when sugar dissolved in water
Answer:
Because the same amount of sugar is still there. The solid sugar crystals break apart in water as the sugar dissolves, but the individual sugar particles or molecules are still present and do not change as a result of dissolving in the water. The combined mass of the sugar and water shouldn't change.
Use the given half reactions to "construct" an electrolytic cell. Zn^2+ + 2 e^--------->Zn E°cell = -0.76 V Cu^2+ + 2 e^---------> Cu E°cell = 0.34 V 1. Predict the standard potential of the cell at 298 K. 2. What is the minimum voltage that should be applied to the standard electrolytic cell found in question to cause zn2+ to be reduced to Zn?
Answer:
See explanation and image attached
Explanation:
The standard cell potential at 298 K is given by;
E°cathode - E°anode
Hence;
E°cell = 0.34 V - (-0.76 V)
E°cell = 0.34 V + 0.76 V
E°cell = 1.1 V
To reduce Zn^2+ to Zn then Zn must be the cathode, hence;
E°cell = (-0.76 V) - 0.34 V
E°cell = -1.1 V
Does water have mass? Yes or no. Thanks everyone for your help
Answer: The density of a material is defined as its mass per unit volume. In this example, each volume of water is different and therefore has a specific and unique mass. The mass of water is expressed in grams (g) or kilograms (kg), and the volume is measured in liters (L), cubic centimeters (cm3), or milliliters (mL).
Explanation: HOPE IT HELPS :)
Hi guys, if you could help me on this question? Which number is the right answer?
Answer:
If my memory serves me correctly, the answer would be OPTION 3
Explanation:
May I have brainliest please? :)
Which of the substances below would dissociate into ions when dissolved in water? Select all that apply.
A. AgCl
B. NaBr
C. Pb(OH)2
D. KOH
Answer:
B. NaBr
D. KOH
Explanation:
Below is the solubility rules given for you knowledge.
Salts of
Group 1 elements are soluble([tex]Li^+, Na^+, K^+,Cs^+, Rb^+[/tex])Ammonium ion is soluble ([tex]NH4^+[/tex])The nitrate are generally soluble( [tex]NO3^-)[/tex]of Cl- , Br- , and I- are soluble, except Ag+ , Pb+2, and (Hg2)+2most sulfate are soluble, except Ba+2, Ca+2,Pb+2, Ag+, Sr+2.most hydroxide salts are only slightly soluble, except NH+4, Li+, Na+, K+Most carbonates are insoluble (CO3 2-) Except group 1 and NH+4most phosphate are insoluble except group 1 and NH+4so using the rules above
NaBr , KOH are soluble, Pb(OH)2 is slightly soluble and AgCl is not soluble.
Answer:hope this helps had to guess these are the correct answers =)
Please help I’ll mark brainliest! Chemistry
Answer:
Plum Pudding Model.
Explanation:
I just know.
Which action is a change in state
a. dissolving
b. tearing
c. stretching
d. condensing
Answer: condensing
Explanation:
Answer:
C
Explanation:
Calculate the mass of a sample of lead (cPb = 0.16 J/g℃) when it loses 200 J cooling from 75.0℃ to 42.0℃.
What is the frequency of a photon whose energy is 3.4 x 10-19 )? (h = 6.626 x 10-34 Js)
Answer:
Frequency of photon is 0.513×10¹⁵ s⁻¹
Explanation:
Given data:
Energy of photon = 3.4×10⁻¹⁹ J
Frequency of photon = ?
Planck's constant = 6.63 × 10⁻³⁴ Js
Solution:
Formula:
E = hf
3.4×10⁻¹⁹ J = 6.626 × 10⁻³⁴ Js × f
f = 3.4×10⁻¹⁹ J / 6.626 × 10⁻³⁴ Js
F = 0.513×10¹⁵ s⁻¹
Frequency of photon is 0.513×10¹⁵ s⁻¹.
Lab: Types of Chemical Reactions
Student Guide
This laboratory allows you to study various kinds of chemical reactions, including some that result in precipitates.
Lesson Objectives
• Compare and contrast synthesis, single-displacement, and double-displacement reactions.
PREPARE
Approximate lesson time is 60 minutes.
Materials
• Lab Instructions: Lab_5.08_Instructions_modified_2020
• Lab Report: Lab_5.08_Report_modified_2020
• Lab Guidelines: Lab_Guidelines_modified
LEARN
Activity 1: Types of Chemical Reactions 1
Instructions
As you read through the lesson online, use the space below to take notes.
In this laboratory, you will study different kinds of chemical reactions.
Knowing the types of reactions helps you interpret your observations.
In a synthesis reaction, two reactants unite to form a third product.
In a single-displacement reaction, one ion of a reactant bonds with the second reactant.
In a double-displacement reaction, ions of both reactants change places.
Activity 2: Types of Chemical Reactions 1
Instructions
Procedure
1. Open the Chemical Reactions Virtual Lab.
2. Click View the Tutorial and complete the tutorial to learn how to conduct the lab.
3. Close the tutorial and click begin the Lab.
Part 1 Synthesis Reaction
4. Perform the procedure, placing the magnesium strip in the flame.
5. Record your reaction.
6. Research the chemical reaction of magnesium and oxygen gas. Write an equation for the chemical reaction
that accounts for the observed reaction in this part of the lab.
7. Answer the question: What is a synthesis reaction?
8. Answer the questions on Part 1 in the Lab Report.
Part 2 Single Displacement Reaction
9. Place 1 scoop of zinc in Vial A and add 10 drops of copper (II) sulfate. Observe the reaction.
10. Place ball of aluminum in Vial B and add 10 drops of copper (II) sulfate. Observe the reaction.
11. Place 1 scoop of zinc in Vial C and add 10 drops of silver nitrate. Observe the reaction.
12. Place copper wire in Vial D and add 10 drops of silver nitrate, wait 5 minutes. Observe the reaction.
13. Complete the ta
Answer:
hope this helps
Explanation:
see pictures try to put them in order
what is the Mr of MgCI2
Molar mass of MgCl₂ : 95 g/mol
Further explanationAn atomic mass unit ( amu or "u") is a relative atomic mass of 1/12 the mass of an atom of carbon-12.
The molar mass(molecular mass-formula mass) of a compound is the sum of the relative atomic mass (Ar) of the constituent elements of the compound
Can be formulated :
M AxBy = (x.Ar A + y. Ar B)
Compound MgCl₂
[tex]\tt M=Ar~Mg+2.Ar~Cl\\\\M=24+2.35.5\\\\M=24+71\\\\M=95~g/mol[/tex]
The specific heat of a substance is 0.38 J/goC. How much energy is required to raise the temperature of 42 g of the substance from 25oC to 39oC?
Answer:
223.4J
Explanation:
Given parameters:
Specific heat capacity of substance = 0.38J/g°C
Mass of substance = 42g
Initial temperature = 25°C
Final temperature = 39°C
Unknown:
Energy required to raise the temperature = ?
Solution:
The amount of heat required by the substances can be derived using the expression below;
H = m c Δt
H is the amount of heat energy
m is the mass
c is the specific heat capacity
Δt is the change in temperature;
Δt = 39°C - 25°C = 14°C
Now insert the parameters and solve;
H = 42 x 0.38 x 14 = 223.4J
Which sugary delight are we looking for
20 POINTS
TREAT
SINIO OOS
20 POINTS
500 POINTS
FRUIT
Answer:
I’m very confused can you clerify that?
Explanation:
Answer:my bit,cu,mghg
Explanation:
A scientist finds that a sample of matter contains three types of atoms. The sample can be any of the following, except:
A. compound
B. molecule
C. element
D. mixture
Answer:
The correct answer is C. element
Explanation:
The sample cannot be an element because an element - or elemental substance - cannot be decomposed into simpler substances. Thus, it cannot be composed by differents types of atoms. For example, an element is carbon (C).
As the sample contains three types of atoms, it can be a compound, a molecule or a mixture, because they can be composed by different types of atoms - of different chemical elements. For example, the sample could contain the element carbon (C) combined with other elements, for example oxygen (O) or hydrogen (H), amoing others.
The sample can not be an element due to having only one type of atom.
The sample can be mixture, compound and molecule except element because element is formed from only one type of atoms which can not be broken down into simpler one. The sample contains three types of atoms which means it may be mixture, compound or molecule.
The reason behind this is that mixture, compound and molecule can be made up of three atoms whereas the element can't so we can conclude that sample can not be an element.
Learn more: https://brainly.com/question/19389549
Which place in the world has the highest average annual precipitation?
Answer: Colombia
Explanation:
1) Aluminum hydroxide, Al(OH)3, is amphoteric. What does this mean?
Explanation:
Aluminium hydroxide is amphoteric. Because it reacts with both acids and bases. Like any conventional base, the OH radical in Al(OH)3 neutralizes H+ to make water and an aluminium salt. Al(OH)3 solid will also react with excess OH– to dissolve and form the complex ion [Al(OH)4]−.
Answer:
Answer: Aluminium hydroxide ,AI(OH)3,is found in nature as the mineral gribbsite (also know as hydrargillite) and its three much rarer poly morphs
Explanation:
yan lang po ang alam ko
For each of the following statements, determine if the trend will increase or decrease. As you move from left to right across the periodic table, the size of atomic radii .
Answer:
I just did the assignment it's "decreases"
Explanation:
If you guys came from Ed-genuity (i'm writing it like that because apperantly that is a swear word?) That means the next questions are "As you move from left to right across the periodic table, electronegativity..." and "As you move from top to bottom within a group, the first ionization energy...".
for electronegativity, it's increases and for ionization energy it's decreases. Hope this helps!
Answer:
1. Decreases
2. Increases
3. Decreases
When an oceanic plate and a continental plate collide, which one will subduct?
1. Oceanic
2.Continental
3.Both
4.Neither one
When an oceanic plate and a continental plate collide, both will subduct. Therefore, option 3 is correct.
What is an oceanic plate ?Oceanic plates are plates found beneath the ocean. As previously stated, oceanic plates are denser than continental plates. This is due to the fact that they are made of denser rocks. Basalt is the most common material found in oceanic plates.
When compared to continental crust, oceanic crust formed at spreading ridges is relatively homogeneous in thickness and composition.
Because oceanic crust is naturally denser, when an oceanic plate converges with a continental plate, the oceanic crust will always subduct beneath the continental crust. Convergent boundaries are frequently linked to larger earthquakes and increased volcanic activity.
Thus, option 3 is correct.
To learn more about an oceanic plate, follow the link;
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The single invention of the ______ has advanced what we know about the universe more than any other scientific technology.
The teacher said the volume of the liquid was 500 mL when measured a student found it was 499.7 mL what is the students percent error
Answer:
0.06 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
error = 500 - 499.7 = 0.3
actual volume = 500 mL
We have
[tex]p(\%) = \frac{0.3}{500} \times 100 \\ = \frac{3}{50} \\ [/tex]
We have the final answer as
0.06 %Hope this helps you
Heat transferred by direct contact from one particle of matter to another is know as ____.
Question 13 options:
A. specific heat
B. radiation
C. condensation
D. conduction
Answer:
B
Explanation:
Answer:
radiation
Explanation:
because it move from one particle to another and place to place
CAN SOMEONE HELP ME PLEASE ASAP I WOULD APPRECIATE IT
Answer:
If we subtract 13.4 from 27.6 we will get 14.2 g.
