Answer:
Speed is the rate at which an object covers distance.
Velocity is the speed of something in a given direction.
How much energy is needed to turn 450 g of zinc into liquid metal at its melting point? (Round your answer to the nearest tenth) *
Answer:
Explanation:
Latent heat of fusion of zinc = 7.322 kJ / mol
molecular weight of zinc = 65 g
450 gram = 450 / 65 = 6.92 mole
Heat required to melt 450 g of zinc = 6.92 x 7.322 kJ
= 50.67 kJ .
= 50.7 kJ .
Helppppp fast please will give brainliest
Answer:
9.32×10⁻³
Explanation:
Scientific notation is the way to express the large value in short form.
The number in scientific notation have two parts.
. The digits (decimal point will place after first digit)
× 10 ( the power which put the decimal point where it should be)
How to add the number in scientific notation with same exponent.
7.21 ×10⁻³ + 2.11 ×10⁻³
exponent of both values are same thus we will take it common.
[7.21 + 2.11 ]×10⁻³
9.32×10⁻³
What subatomic particle identifies any type of
atom?
Answer:
hope it helps..
Explanation:
Number of protons
More information: The atomic number is used to identify an element, and the atomic number is the number of protons in the nuclei of an element. Every element has its own unique number of protons, and therefore, atomic number.
a student is using colored beads to make a model of aluminum sulfate, Al2(SO4)3.
Aluminum atoms are represented by green beads, sulfur atoms by blue beads, and
oxygen atoms by yellow beads. What combination of beads should the student use for
the model?
The combination of beads should the student use for the model :2 green, 3 blue and 12 yellow
the modelFurther explanationIn the chemical formula of a compound there are numbers:
1. The number indicates the number of atoms written after the element symbol
2. The number after the parentheses represents the number multiplied by the number of atoms in parentheses.
3. The number before the chemical formula shows the number of molecules behind it, which is usually used in equations
To calculate the beads needed to make a model, we must count the number of atoms of the Al₂(SO₄)₃ molecule
In the Al₂ (SO₄) ₃ molecule there are 3 atoms : Al, S, and O
1. Number of Al atoms: 2 2. The number of atoms S = 3 x 1 = 3 3. The number of atoms O = 4 x 3 = 12So the combination of beads
2 green(for Al), 3 blue(for S) and 12 yellow(for O)
Answer:
2 blue, 3 yellow, and 12 green
Explanation:
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
List harmful effects of global warming? PLZZ HELP WHOEVER IS FIRST ILL MARK BRAINLEIST
Answer:
first theres the poliution one of the biggest things thats starts global warming then theres recycle and non recycle because people mix there trash up when their not suppossed to.
Explanation:
Which tools can be used to measure the volume of a substance? Select the two correct answers.
a. tape measure
b. digital balance
c. measuring cup
d. graduated cylinder
Answer:
graduated cylinder and a scale can be used to measure the volume of a substance. hope this is helpful
Explanation:
3. magnesium oxide + ?______________________ magnesium nitrate + water
word equation:
________________________________________________________________
full equation:
________________________________________________________________
Ionic equation:
________________________________________________________________
Answer:MgO reacts with nitric acid
Is calcium chloride reactive?
Answer:
Yes it is
Explanation:
calcium chloride releases heat in an exothermic reaction.
yes.
hope is helps! :)
Johnny wanted to paint the ceiling of his room to show the stars of the Milky Way galaxy. What color(s) should he use?
Answer:
He should use black a light purple brown, tan, blue, and just a tiny bit of pink!
Hope this helps!!
Explanation:
If Johnny wanted to show the brightness of the stars, he should use blue, light blue, yellow, orange, red, and white.
What is Milky way??The Milky Way is a huge collection of stars, dust and gas .
The Milky Way is seen as a mostly flat, irregularly-shaped feature that stretches from side to side The Milky way is the mixture of the colors as blue , yellow , orange and white so that it express the appearance of brightness of stars , dust and gasHence , Johnny should use blue, light blue, yellow, orange, red, and white.
Learn more about milky way below
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[Ne] 3s^ 2 3p^ 4 can someone tell me the element
Answer:
Sulpher
Explanation:
For this type of questions; calculate the total number of electrons so that you can identify the element from the periodic table.
Neon has 10 electrons. and from 3s^2 and 3p^4 there are 6 electrons.
So the total number of electrons is 16.
The element is Sulpher from group 6 of the periodic table
Summary about helium
Answer: Helium is an type of air that can be used to inflate balloons, balls, and other things that require air. The carbon dioxide we breath out is similar to this helium.
Hope this helps!
Friendship is delicate as a glass, once broken it can be fixed but there will always be cracks. Two persons cannot long be friends if they cannot forgive each other's little failings. We all lose friends.. we lose them in death, to distance, and over time.
Answer:
make a new friend if you lose one, Its part of life losing people thats what make us people grow and be more mature.
What is the underlying, fundamental force for the formation of all chemical bonds?
A detailed explanation would be best, please.
Answer:
[tex]it \: is : \\nuleic\: force\: of\: ( attraction \: and \: repulsion).[/tex]
Explanation:
[tex]this \: is \: because, \: for \: any \: type \: of \: chemical \\\: combination \: (bonding) \: to \: be \: possible, \\ there \: must \: exist\: an \: equilibrium \: between \: \\ the \: force \: of \: attraction \: and \: repulsion.[/tex]
Answer:
bonds are formed by joining atoms whether same or different elements to form molecules by uses of forces of attractions
can u help me with my science problems
Answer:
what is the question
Explanation:
what do you need help with
Is the solution a heterogeneous mixture?
Answer:
nope homogeneous
Explanation:
hope this helps :)
Answer:
SOLUTIONS are homogeneous mixtures. A solution is a mixture of two or more substances in a single phase.
I need help please
Answer: If you think about it, B. would be the most reasonable answer with the given factors.
CAN SOMEONE PLEASE HELP ME WITH THIS QUESTION
Wrong or inproper answer will be reported
The mass of unreacted zinc = 13 g
Further explanationThe reaction equation is the chemical formula of reactants and products
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reactants and products
Reaction
[tex]\tt Zn+2HCl\Rightarrow ZnCl_2+H_2[/tex]
mol ratio Zn : HCl = 1 : 2
mol of HCl[tex]\tt mol=V\times M\\\\mol=0.1~L(100~cm^3)\times 2~mol/L\\\\mol=0.2[/tex]
mol of Zn[tex]\tt \dfrac{1}{2}\times 0.2=0.1~mol[/tex]
the mass of reacted Zn :[tex]\tt 0.1\times 65=6.5~g[/tex]
the mass of unreacted Zn[tex]\tt 19.5-6.5=\boxed{\bold{13~g}}[/tex]
what is action force?
Answer:
is force acting in one direction
Answer:
hope this helps!
as described by the third of Newton's law of motion of classical mechanics, offices occurs in pairs such that is one object exerts a force on another object, then the second object exerts an equal and opposite reaction Force on the first.
Where are hormones produced in animals, and how are they transported throughout the body?
A. Animal hormones are produced in endocrine glands and travel through the blood.
B. Animal hormones are produced in lymph nodes and travel through the lymphatic system.
C. Animal hormones are produced inside the bones and travel through the nervous system.
D. Animal hormones are produced in sweat glands and travel through the skin.
Answer:
Vertebrate Endocrine Glands and Hormones
Unlike plant hormones, animal hormones are often (though not always) produced in specialized hormone-synthesizing glands (shown below). The hormones are then secreted from the glands into the blood stream, where they are transported throughout the body.
Calculating Density A sample of a sub-
stance with a mass of 85 g occupies a vol-
ume of 110 cm What is the density of
the substance? Will the substance float
in water? Explain your answer:
Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{85}{110} \\ = 0.772727272...[/tex]
We have the final answer as
0.77 g/cm³The substance will float on water since it's density is less than that of water which is
1 g/cm³.
Hope this helps you
How would you describe the conditions in the lower mantle?
Answer:
hi..
Explanation:
The lower mantle is hotter and denser than the upper mantle and transition zone. The lower mantle is much less ductile than the upper mantle and transition zone. Although heat usually correspond s to softening rocks, intense pressure keeps the lower mantle solid. Geologists do not agree about the structure of the lower mantle.
hope this helps ._.
very hot at temperatures, i think i would set it to 43 degrees celsius as its much colder and better
hope this helps!
⚠️⚠️ period and group PLEAAE CHECK OUT THE QUESTIONNS IMAGE ⚠️⚠️
Answer:
group 5, period 7
Any one know the answer?
[tex]1 \: mol MgSO4 \: has \: 4 \: oxygens[/tex]
Thus ;
[tex]2 \: mols \: of \: should \: have \: 8 \: oxygens[/tex]
So the correct answer is (( 8 مول ))
put 34,100,000 in scientific notation
Answer:
3.41 x 10^7
Explanation:
It is a mixture that consists of a liquid solvent and dissolved solute.
Answer:
A solution is a homogeneous mixture consisting of a solute dissolved into a solvent . ... The solute is the substance that is being dissolved, while the solvent is the dissolving medium. Solutions can be formed with many different types and forms of solutes and solvents.
Answer:
A solution is a homogeneous mixture consisting of a solute dissolved into a solvent .
Explanation:
Which of the models best represents CaCO3?
Answer: B
Explanation:
To solve this we must be knowing each and every concept related to CaCO[tex]_3[/tex]. Therefore, the correct option is option B among all the given options.
What is CaCO[tex]_3[/tex]?Carbonate of calcium One of the best-known compounds is CaCO[tex]_3[/tex]. Calcium carbonate is indeed a non-toxic, odorless substance. CaCO[tex]_3[/tex] is a white mineral found naturally in chalks, limestones, and marbles. It is a common material found in rocks as calcite and aragonite.
CaCO[tex]_3[/tex] is most commonly found in limestone. It is a sedimentary rock composed primarily of calcite and is the primary component of eggshells, snail shells, seashells, and pearls. Calcium carbonate is also used in medicine as a source of calcium or as an antacid. Although excessive calcium carbonate ingestion is dangerous and causes poor digestion.
Therefore, the correct option is option B.
To know more about CaCO[tex]_3[/tex], here:
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Which of the following numbers is in correct Scientific Notation
13.6x103
174.5
O 0.26x10-2
1.5x105
Question 6
Answer:
1.5 x 10⁵
Explanation:
Scientific notation always starts in the 1's place (1.)
How many atoms of aluminum (Al) are contained in 3.73 moles of alumni
Number of atoms : 2.245 x 10²⁴
Further explanationA mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
n= 3.73 moles
Number of atoms :
[tex]\tt 3.73\times 6.02\times 10^{23}=\boxed{\bold{2.245\times 10^{24}}}[/tex]
List 3 properties of solids. Do the same for liquids and gases.
Answer:
GAS .assumes the shape and volume of its container
particles can move past one another
.compressible
lots of free space between particles
.flows easily
particles can move past one another
LIQUID assumes the shape of the part of the container which it occupies
particles can move/slide past one another
.not easily compressible
little free space between particles
.flows easily
particles can move/slide past one another
SOLID .retains a fixed volume and shape
rigid - particles locked into place
.not easily compressible
little free space between particles
.does not flow easily
rigid - particles cannot move/slide past one another