Answer:
1. Uniform, non visible
2. Visible, non uniform
3. Uniform, non visible
4. Visible, non uniform
5. Visible, non uniform
Explanation:
A heterogeneous mixture is simply any mixture that is not uniform in composition — it's a non-uniform mixture of smaller constituent parts. By contrast, a mixture that is uniform in composition is a homogenous mixture
visible state of matter is when you can easily difference two components of a mixture
non visible is when the state of the matter in the substance is not visible to the eye, it can't be differentiated
Models are used to predict behaviors in the real world.
True
False
22. What is the mass in grams of each of the following?
a. 3.011 x 1023 atoms F
b. 1.50 x 1023 atoms Mg
c. 4.50 x 1012 atoms Cl
d. 8.42 x 1018 atoms Br
e. 25 atoms W
f. 1 atom Au
The mass in grams of 3.011 x 10²³ atoms of F is 9.5 g.
The mass in grams of 1.50 x 10²³ atoms of Mg is 5.98 g.
The mass in grams of 4.50 x 10¹² atoms of Cl is 2.65 x 10⁻¹⁰ g.
The mass in grams of 8.42 x 10¹⁸ atoms of Br is 1.12 x 10⁻³ g.
The mass in grams of 25 atoms of W is 3.1 x 10⁻²¹ g.
The mass in grams of 1 atom of Au is 3.27 x 10⁻²² g.
What is the mass in grams of 3.011 x 10²³ atoms F?
The mass in grams of 3.011 x 10²³ atoms of F is calculated as follows;
6.023 x 10²³ atoms = 19 g of F
3.011 x 10²³ atoms F = ?
= (3.011 x 10²³ x 19 g)/(6.023 x 10²³)
= 9.5 g
The mass in grams of 1.50 x 10²³ atoms of Mg is calculated as follows;
6.023 x 10²³ atoms = 24g of Mg
1.5 x 10²³ atoms F = ?
= (1.5 x 10²³ x 24 g)/(6.023 x 10²³)
= 5.98 g
The mass in grams of 4.50 x 10¹² atoms of Cl is calculated as follows;
6.023 x 10²³ atoms = 35.5 g of Cl
4.5 x 10²³ atoms Cl = ?
= (4.5 x 10¹² x 35.5 g)/(6.023 x 10²³)
= 2.65 x 10⁻¹⁰ g
The mass in grams of 8.42 x 10¹⁸ atoms of Br is calculated as follows;
6.023 x 10²³ atoms = 80 g of Br
8.42 x 10¹⁸ atoms Br = ?
= (8.42 x 10¹⁸ x 80 g)/(6.023 x 10²³)
= 1.12 x 10⁻³ g
The mass in grams of 25 atoms of W is calculated as follows;
6.023 x 10²³ atoms = 74 g of W
25 atoms W = ?
= (25 x 74 g)/(6.023 x 10²³)
= 3.1 x 10⁻²¹ g
The mass in grams of 1 atom of Au is calculated as follows;
6.023 x 10²³ atoms = 197 g of Au
1 atom of Au = ?
= (1 x 197 g)/(6.023 x 10²³)
= 3.27 x 10⁻²² g
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Question 1 of 5
An atom's nucleus contains 8 particles that have no charge and 6 particles
that are positively charged. What is the atomic number of the atom?
A. 2
O
B. 8
C. 6
D. 14
SUBMIT
Answer:
C. 6
Explanation:
The atomic number of a number is related to the number of protons in the nucleus.
How many atoms are in 1.27 mol of pure aluminum?
Answer:
To determine the amount of atoms (or molecules) present given the moles of an element, you multiply the amount of moles by Avogadro's number,
6.022
⋅
10
23
4 mol
A
l
6.022
⋅
10
23
1
m
o
l
=
2.41
⋅
10
24
atoms/molecules of
A
l
Explanation:
How would you make the following compounds from N-benzylbenzamide?
a)dibenzylamine
b)benzoic acid
c)benzyl alcohol
Answer:
B.
Explanation:
What is the molarity of a solution that contains 0.505 mol KCl (molar mass = 74.55 g/mol) in 7.98 L of solution?
Answer:c
=
0.0253 M
Explanation:
Molarity is a measure of a solution's concentration in terms of how many moles of solute it contains per liter of solution.
So, in essence, if you have the number of moles of solute, like you do here, and the total volume of the solution expressed in liters, you can find how many moles of solute you get per liter, i.e. the molarity of the solution.
Keeping in mind the fact that the moles of solute are distributed evenly in any given volume of the solution, you can say that because
7.98 L
of solution contain
0.202
moles of solute, which in your case is potassium chloride,
KCl
,
1 L
of this solution will contain
1
L
⋅
0.202 moles KCl
7.98
L
=
0.0253 moles KCl
So, if your solution contains
0.0253
moles of potassium chloride per liter, it follows that its molarity is equal to
c
=
0.0253 M
Here
M
is equivalent to
mol/L
, or molar.
The molarity of the solution that contains 0.505 mol KCl in 7.98 L of the solution is 0.0632 moles/L.
What is called the Molarity of a solution?Molarity is a measure of a solution concentration in terms of how many moles of solute it contains per liter of solution.
Molarity = Moles of solute / Liters of solution
Its unit is mole/L
Calculating the molarity of the given solution:Given that a solution contains 0.505 mol KCl in 7.98 L of solution
Moles of solute (KCl) = 0.505 mol
Liters of solution = 7.98 L
Then, the molarity will be
M = [tex]\frac{0.505}{7.98}[/tex]
= 0.0632 moles/L
Therefore, the molarity of the given solution is 0.0632 moles/L.
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What is difinition of chemistry
What is metabolism? I know the answer.
Answer:
Metabolism is the set of life-sustaining chemical reactions in organisms. The three main purposes of metabolism are: the conversion of the energy in food to energy available to run cellular processes
Explanation:
What is the angle between adjacent sp hybrid orbitals?
Answer:
180 degrees
Explanation:
sp hybridization generates orbitals that overlap linearly, generating a straight line. This leads to an angle measurement of 180 degrees.
During autumn, days grow colder. What happens to the nights?
They grow brighter.
They grow shorter.
They grow warmer.
They grow longer.
Answer:
I thinks its they grow longer explaination: I have a massive brain
Answer:
Brighter
Explanation:
HELP SOON PLEASE THIS IS DUE TONIGHT! I WILL GIVE BRAINLIEST!
In an experiment where you use wires, a 9 volt battery, and a light bulb; what would be the best conductor to put on the ends of the wires? Please rate the following solution/liquids and their brightness from 1-5
-Tap water
-Baking soda
-Vinegar
-Coca Cola (or any soda, I guess)
Answer:
I would say baking powder maybe or you should try tap water
Answer:
1st one - tap water (ill go over them one by one to help you understand why)
Its honestly rather vinegar or tap water but if I would go with tap water however I could be wrong. I don't take your class lol
Step by step:
First, tap water includes a lot of ions and contaminants. As a result, tap water only contains ions capable of conducting electricity. As a result, tap water is an excellent electrical conductor.
2nd) Ammonia and baking soda are both weak bases. When weak electrolytes dissolve in water, the resulting solution has a low conductivity.
Third, because it releases H+ and CH3COO- ions, the mobility of these ions in the solution assists in electrical conduction. As a result, vinegar is a good electrical conductor.
4th) When dissolved in water, soda compounds (chemicals mostly containing sodium) include ions, and ions assist conduct electricity. As a result, it does not conduct because it lacks ions or charged particles.
What is the atomic mass of Helium
Answer:
4.002602 u
Explanation
Answer:
4.002602 u
Explanation:
Please help me I can’t figure it out
1. Calculate the wavelength of light with a frequency of 1.89 x 1018 Hz.
a
Answer:
1.92402 kilohertz
Explanation:
hope this helps
Answer:
• From wave equation :
[tex]{ \rm{v = f \lambda}}[/tex]
v is velocity, v = 3.0 × 10^8 m/sf is frequencylambda is the wavelength[tex]{ \rm{3.0 \times {10}^{8} = (1.89 \times {10}^{18}) \times \lambda}} \\ \\ { \rm{ \lambda = \frac{3.0 \times {10}^{8} }{1.89 \times {10}^{18} } }} \\ \\ { \boxed{ \rm{ \: \lambda = 1.587 \times {10}^{ - 10} \: }}}[/tex]
6. What is the atomic mass of Hafnium if out of every 200 atoms, 10 have mass 176.00 g/mol, 38 have mass
177.00 g/mol, 54 have mass 178.00 g/mol, 28 have mass 179.00 g/mol, and 70 have mass 180.00 g/mol?
Answer:
ttyhjj
Explanation:
How do we find the atomic size of an atom?
Answer:
The size of an atom can be estimated by measuring the distance between adjacent atoms in a covalent compound. The covalent radius of a chlorine atom, for example, is half the distance between the nuclei of the atoms in a Cl2 molecule.
Two carbon atoms (Group 14) bond with two hydrogen atoms (Group 1) to form acetylene (C2H2). How would each carbon atom in acetylene bond?(1 point)
Each carbon atom would share one pair of electrons with the other carbon atom and three pairs with each hydrogen atom.
Each carbon atom would share one pair of electrons with the other carbon atom and two pairs with each hydrogen atom.
Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.
Each carbon atom would share one pair of electrons with hydrogen and one pair with the other carbon atom.
In acetylene each carbon atom share one pair of electrons with hydrogen atom and three pairs with the other carbon atom.
Carbon atom has four electrons its outermost shell it means that it needs four electrons to become stable. In acetylene, two carbon atoms covalently bonded three pairs of electron with each other and the one remaining pair is covalently bonded with two hydrogen atoms.
In this way the carbon as well as hydrogen atoms get stability so we can conclude that in acetylene each carbon atom share one pair of electrons with hydrogen atom and three pairs with the other carbon atom.
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In C2H2, each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.
Acetylene has the molecular formula C2H2. We must recall that carbon is a member of group 14 and it is always tetravalent in all its compounds. Hydrogen is always univalent in its compounds except in hydrides.
Since carbon is always tetravalent and hydrogen is univalent,each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom in C2H2.
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Acetylene (C2H2) gas and oxygen (02) gas react to form carbon dioxide (CO2) gas and water (H20) vapor. Suppose you have 2.0 mol of C,H, and 1.0 mol
of o, in a reactor
Calculate the largest amount of CO, that could be produced. Round your answer to the nearest 0.1 mol.
The largest amount of CO₂ produced when 2 moles of C₂H₂ reacted with 1 mole of O₂ is 0.8 mole
We'll begin by writing the balanced equation for the reaction. This is given below:
2C₂H₂ + 5O₂ —> 4CO₂ + 2H₂O
2 : 5
2 : 1
From the balanced equation above,
We can see that O₂ is the limiting reactant as lesser amount of it is available.
Finally, we shall determine the largest amount of CO₂ produced by using the limiting reactant as illustrated below:
From the balanced equation above,
5 moles of O₂ reacted to produce 4 moles of CO₂.
Therefore,
1 mole of O₂ will react to produce = 4/5 = 0.8 mole of CO₂.
Thus, the largest amount of CO₂ produced from the reaction is 0.8 mole
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A line can be used to represent a covalent bond between two atoms. Diagram pairs of atoms
that can form single, double, and triple bonds.
Can every atom form each of these kinds of bonds?
The covalent bond has been formed by the atom with the difference in the electronegativities and the presence of loan pair for an unsaturated bond.
The covalent bond has been formed between the atoms when there has been the sharing of electrons. The presence of loan pairs results in the formation of pi bonds, which are unsaturated covalent sharing formed above or below the covalent bonds.
An example of pair with a single bond has been:
H-HO-OThe examples of pairs with double bonds:
HHC=CHHC=OThe examples of pairs with triple bonds:
N [tex]\equiv[/tex] NHC [tex]\equiv[/tex] CHNot every atom can form these bonds as there has been the presence of loan pairs with the atom for the formation of the double and triple bond.
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3. Ethanol has a density of 0.800 g/mL.
a. What is the mass of 225 mL of ethanol?
Since the ethanol has a density of 0.800 g/mL, the mass of the ethanol is 180 grams.
Given the following data:
Volume of ethanol = 225 mLDensity of lead ball = 0.800 g/mL.To find the mass of the ethanol;
Density can be defined as mass all over the volume of an object.
Mathematically, the density of a substance is given by the formula;
[tex]Density = \frac{Mass}{Volume}[/tex]
Making mass the subject of formula, we have;
[tex]Mass = Density \times Volume[/tex]
Substituting the given parameters into the formula, we have;
Mass of ethanol = 180 grams.
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Why is the periodic table not arranged by atomic weight and instead arranged by atomic number?
At before Duberinor,Mendeleev tried to use atomic weight but they failed .
The electronic transition in a hydrogen atom from n = 7 to n = 2 emits electromagnetic radiation having a longer wavelength than a transition from n = 6 to n = 3.
Answer: I'll leave the answer rounded to three sig figs.
mark me brainlist
So, you can say that in a hydrogen atom, an electron located on
n
i
=
2
that absorbs a photon of energy
4.85
⋅
10
−
19
J
can make the jump to
n
f
=
6
.
Explanation:
The question wants you to determine the energy that the incoming photon must have in order to allow the electron that absorbs it to jump from
n
i
=
2
to
n
f
=
6
.
A good starting point here will be to calculate the energy of the photon emitted when the electron falls from
n
i
=
6
to
n
f
=
2
by using the Rydberg equation.
If the specific heat of Copper is 0.385 J/g °C and I add 10 kJ of heat to a 10kg block of copper, how much will the temperature of copper change?
a. 0.384 °C
b. 2.60 °C
c. 38.4 °C
d. 384 °C
e. more than 400°C
We have that for the Question "If the specific heat of Copper is 0.385 J/g °C and I add 10 kJ of heat to a 10kg block of copper, how much will the temperature of copper change?" it can be said that the temperature of copper change is
dt=2.60C
Option B
From the question we are told
If the specific heat of Copper is 0.385 J/g °C and I add 10 kJ of heat to a 10kg block of copper, how much will the temperature of copper change?
a. 0.384 °C
b. 2.60 °C
c. 38.4 °C
d. 384 °C
e. more than 400°C
Generally the equation for the Heat is mathematically given as
Q=Mcdt
Therefore
dt=\frac{1}{0.385}
dt=2.60C
Therefore
the temperature of copper change is
dt=2.60C
Option B
\
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What would be the product when combustion reaction occurs in a small tightly-closed container?
Answer:
Incomplete combustion produces carbon monoxide along with some carbon dioxide. Water is always produced during combustion. If the fuel is sulfur containing, carbon disulfide will result as well.
Have a happy day! <3Miss Hawaii
Explanation:
Plss answer!!! I need help fast
Answer:
2 Na atoms
1 C atom
3 O atoms
gram formula weight = 105.99 g
hope this helped :)
Explanation:
→ Na
# of Atoms - 2
→ C
# of Atoms - 1
→ O
# of Atoms - 3
→ gram formula weight (g) : 105.99 g
Rock salt is a mixture of salt (sodium chloride) and sand. Describe how you would separate rock salt to obtain salt crystals and pure dry sand. In this question you get marks for how well your answer is written. You will get marks for: spelling, grammar, organising your ideas and information clearly and using key scientific words.
Answer:
pour the rock salt mixture throught a filter made from paper and allow the liquid to filtrate .
Explanation:
Separating Sand and Salt
Probably the easiest method to separate the two substances is to dissolve salt in water, pour the liquid away from the sand, and then evaporate the water to recover the salt.
Pour the liquid through a paper filter made of rock salt mixture and let it filter, after complete filtration we obtain crystals of salt.
What is filtration?Filtration is defined as the technique of removing solid particles from a liquid or gaseous fluid by passing the fluid through a filter media while keeping the solid particles behind.
It can also be defined as a physical method that uses a filter media with a complicated structure that only allows fluid to pass through to separate solid matter and liquid from a combination.
There are six types of filtration.
Vacuum filtrationCentrifugal filtrationGravity filtrationCold filtrationHot filtrationMultilayer filtrationMixture is defined as a substance that is composed of two more chemical compounds or substances that do not chemically mix.
There are two types of mixture.
Homogenous mixtureHeterogenous mixtureThus, pour the liquid through a paper filter made of rock salt mixture and let it filter, after complete filtration we obtain crystals of salt.
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A supermassive black hole can be found at
Location 1
Location 2
Location 3
Location 4
Answer:
location 2
Explanation:
Select the statements that correctly describe an comet. Check all that apply
made of metals and gas
made of ice, dust, and gas and display a tail near the Sun
have short orbits that keep them close to the sun
have huge elliptical orbits that take them past Neptune
Answer:
made up of ice dust and gas and display a tail near the sun
Explanation:
explain why an atom can only emit specific wavelengths of light and not every possible wavelength
Answer:
The electrons in an atom can only occupy certain allowed energy levels to a lower one, the excess energy is emitted as a photon of light, with its wavelength dependent on the change in electron energy. This is why an atom can only emit specific wavelengths of light and not every possible wavelength.
What is the Ideal level for chlorine in a spa?
Answer:
at least 3 ppm in hot tubs/spas
Explanation:
identify impacts of air pollution
Answer:
Air pollution can also cause headaches, dizziness, and nausea. ... Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases such as emphysema. Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs.
Explanation:
https://www.nationalgeographic.org/encyclopedia/air-pollution/#:~:text=Air%20pollution%20can%20also%20cause%20headaches%2C%20dizziness%2C%20and%20nausea.&text=Long%2Dterm%20health%20effects%20from,%2C%20liver%2C%20and%20other%20organs.