Complete each of these
.
The earth is slightly tilted on its axis. How much is it tilted?
A. 23.5 degrees
B. 28 degrees
C. 20.5 degrees
D. 25 degrees
Answer: D 25 degrees
Explanation: The reason because is 25x4=100 and slightly tilted =1/4 of the earth which is 25
Polyacrylamide is used in manufacturing soft contact lenses. It consist of 50.69% carbon, 19.71% nitrogen, 7.09% hydrogen, and 22.51% oxygen. Calculate the empirical formula for polyacrylamide.
Answer: The empirical formula is [tex]C_3NH_5O[/tex].
Explanation:
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of C = 50.69 g
Mass of N= 19.71 g
Mass of H = 7.09 g
Mass of O = 22.51 g
Step 1 : convert given masses into moles.
Moles of C = [tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{50.69g}{12g/mole}=4.22moles[/tex]
Moles of N=[tex]\frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{19.71g}{14g/mole}=1.41moles[/tex]
Moles of H=[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{7.09g}{1g/mole}=7.09moles[/tex]
Moles of O = [tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{22.51g}{16g/mole}=1.41moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C =[tex]\frac{4.22}{1.41}=3[/tex]
For N = [tex]\frac{1.41}{1.41}=1[/tex]
For H = [tex]\frac{7.09}{1.41}=5[/tex]
For O =[tex]\frac{1.41}{1.41}=1[/tex]
The ratio of C:N:H: O = 3:1:5:1
Hence the empirical formula is [tex]C_3NH_5O[/tex].
Which of the following phrases best describes an atom? Choose the two correct answers.
A.
made up of protons, electrons, and neutrons
B.
made up of solids, liquids, and gases
C.
largest unit of matter
D.
smallest unit of matter
E.
made up of water
Answer:
A & D
Explanation:
all of the other things are made up of atoms, not what atoms themselves are made of. they are not large, and they make up all matter
An atom is made up of a nucleus and revolving electrons. Inside the nucleus protons and neutrons are located. Thus the components of an atom are protons, electrons and neutrons. Thus, option A is correct.
What is an atom?An atom is the basic unit of every substances. Atoms combine together to form molecules, molecules then forms compounds and so on.
The inner core of an atom is called nucleus which contains positively charged particles namely protons and neutral particles neutrons. There are circular paths of fixed energy surrounding the nucleus.
The circular paths around the nucleus is called orbits through which the electrons are revolving. Electrons are negatively charged particles and they neutralize equal number of positive charges.
A neutral atom have equal number of protons and electrons and this number is called its atomic number. The sum of number of protons and neutrons is called the mass number.
Hence, an atom is made up of protons, electrons, and neutrons and option A is correct.
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PLEASEHELP WILL MARK BRAINLIEST
Answer:
2. Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties. Every chemical element has one or more isotopes.
3. Since the vast majority of an atom's mass is found its protons and neutrons, subtracting the number of protons (i.e. the atomic number) from the atomic mass will give you the calculated number of neutrons in the atom. In our example, this is: 14 (atomic mass) – 6 (number of protons) = 8 (number of neutrons).
Explanation: Try rewording the questions when looking it up. Hope this helps
Answer:
9. 2(2n^2)
10. Electron Shell
11.-
12.-
13.-
14.-
Explanation:
i hope it helped
can someone tell me the answer
If the earth's mantle were completely solid,__________ plates could not move around.
Answer:tectonic
Explanation:
Answer:
TECTONIC
Explanation:
The Electron Affinity(EA) tends to _________ as the atomic number increases In any group.
a.)increase
b.)decrease
:) thank uuu
Answer:
decrease
Explanation:
find ionic compounds
Answer:
1:1
Explanation:
The ratio of metal cationic atom to non-metal anionic atom in the compound is 1:1.
This is an ionic compound.
This is because metal cationic atom has two valence electrons. Non-metal anionic oxygen has six valence electrons Calcium loses two of its valence electrons to be isoelectronic with Ar and this confers a stable configuration to it. Non-metal oxygen atom accepts the electrons and adds 2 to its 6 electrons to become isoelectronic with neon. So, 1 metal cationic atom combines with 1 non-metal anionic atom to form the compound.What would be the change in
temperature if 5.0 g of water
absorbed 209 J of heat?
Answer: he temperature of 100 grams of water changes from 16°C/7 How many kilojoules of heat are absorbed when 70.00 grams to 20°C.
Explanation: I hope that helped!
Your friends car has stalled in the road. You help you friend push the car off the road. Your friend pushed with a force of 55 N and you push in the same direction with a force of 60 N. How much force is being applied to the car
Answer:
115N
Explanation:
your friend and you push the car at the same time at the same direction so you add the force your friend is using and the force you’re using so: 60+55=115N
why gold is called inert metal
Gold has a heavy enough nucleus that its electrons must travel at speeds nearing the speed of light to prevent them from falling into the nucleus. This relativistic effect applies to those orbitals that have appreciable density at the nucleus, such as s and p orbitals. These relativistic electrons gain mass and as a consequence, their orbits contract. As these s and (to some degree) p orbits are contracted, the other electrons in d and f orbitals are better screened from the nucleus and their orbitals actually expand.
Since the 6s orbital with one electron is contracted, this electron is more tightly bound to the nucleus and less available for bonding with other atoms. The 4f and 5d orbitals expand, but can't be involved in bond formation since they are completely filled. This is why gold is relatively unreactive.
Hope it helps
Gold is relatively inert metal because, the one valence electron in 6s orbital is not available for bonding since it is more attracted by nucleus. The 4f and 5d orbitals are completely filled and does not involve in bonding.
What is inertness ?Some elements tends to be unreactive compared to the other by their extra stability factors. This unreactness is called inertness. The 18th group elements are all inert since they are highly stable due to completely filled electronic configuration.
Gold is 79th element in periodic table. It is a transition metal located in d-block. The electronic configuration of gold is [Xe] 4f¹⁴ 5d¹⁰ 6s¹. There is only valence electron which is in the 6s orbital.
The 4s orbital experience more nuclear pull which leads to the unavailability of the valence electron. The 4f and 5d orbitals are completely filled and does not involve in chemical bonding. That's why gold is called inert metal.
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What are the similarities and differences in slurries, sols, pastes and gels?
I actually do not know the answer can I help tommorow if you are fine with it tooo sleeeepy have 14 exams tommorow have to prepare.
Sorry:(
hello, what’s the difference between oxidation and oxidising agents?
Answer:
An oxidising agent oxidises something else. Oxidation is loss of electrons (OIL RIG). That means that an oxidising agent takes electrons from that other substance.
Explanation:
i’ll mark brainliest please
Someone please help
Answer:
M = molar concentration
n = moles of solute
v = liters of solution
Explanation:
Rank these elements from smallest to largest atomic radii: zinc, calcium, radium, and bromine.
Select one:
O a. calcium, radium, zinc, bromine
O b. calcium, zinc, bromine, radium
c. bromine, zinc, calcium, radium
d. bromine, zinc, radium, calcium
Answer:
The correct option is;
c. Bromine, zinc, calcium, radium
Explanation:
The atomic radii of the elements as arranged in the periodic table decreases across the period and increases down the groups
The location of each of the elements are;
Zinc: Period 4, Group 12
Calcium: Period 4, Group 2
Radium: Period 7, Group 2
Bromine: Period 4, Group 17
Therefore, the element with the largest atomic radius = Radium
The element with the smallest atomic radius = Bromine
Calcium comes before zinc on period 4, therefore, the atomic radius of calcium is larger than that of zinc
The rank of the elements from smallest to largest atomic radius is therefore;
Bromine, zinc, calcium, radium.
Why does the human eye see different colors?
Answer:
The human eye and brain together translate light into color. Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. ... Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors
Explanation:
i have advancedddd
What is a metallic bonding? A) The chemical bonding that takes place between metal atoms when they share electrons. B) The chemical bonding that takes place between metat atoms when they transfer electrons. C) The chemical bonding that takes place from the attraction of metal atoms and the other elements. D) The chemical bonding that takes place from the attraction of metal atoms and the surrounding sea of electrons.
Answer:
D) The chemical bonding that takes place from the attraction of metal atoms and the surrounding sea of electrons.
Explanation:
TOOK THE TEST
the chemical bonding or connection that occurs when metal atoms share electrons
The correct answer is A
Why is chemical bonding significant, and what is it?Chemical bonds that hold molecules together also form temporary connections vital for life. Ionic, covalent, hydrogen, and London dispersion forces are examples of chemical bonding.
How are chemcial bonds created?An attraction between ions or atoms is referred to as a chemical bond. Atoms trade or exchange valence electrons to create bonds. To reach a complete outer energy level, which is the most stable configuration of electrons, atoms must form chemical bonds.
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how many grams of chlorine can be produced by the electrolysis of sodium chloride solution
Fe²O³ + 3CO --> 2 Fe + 3CO²
calculate the mass of chlorine that can be formed from 50g of sodium chloride
Answer:
4.3/5. 129
Explanation:
Hope this is correct
An atom gains electrons to become negatively charged
А
anion
B
cation
с
ionic bond
D
covalent bond
E
metallic bond
Answer:
A) an anion is an ion with a negative charge
B) a cation is an ion with a positive charge
The rest are bonds and do not pertain to the question
What are two or more substances not chemically combined called? *
Element
Compound
Mixture
Atom
Answer:
✖︎ Mixture← is the right answer answer, so don't choose that....…
THE corrects answer would be MIXTURE
!!!!!!Brainliest??
EXPLANATION
✰1. I take the quiz
✰2. The word already describe it self, mixture is a substance made by mixing other substances together.
✰a mixture is a material made up of two or more different substances which are physically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
How many grams of chlorine can be produced by the electrolysis of sodium chloride solution
Fe²O³ + 3CO --> 2 Fe + 3CO²
calculate the mass of chlorine that can be formed from 50g of sodium chloride
Answer:
Therefore,900 C of charge produce produce chlorine=(71g)(1.93×105C)×(900C)=0.331g.
Explanation:
Follow me..........
When a ball is rolling down a hill, what forces are acting on the ball? Why does it speed up?
Include friction and gravity in your answer.
Answer:gravity
Explanation:
Answer:
the gravity speed up because the friction didn't speed up
Help! Please will give brainliest for right answer!
Answer:
a positive nucleus gets smaller the negative electrons are attached closer in
Explanation:
Calculate the volume (in cm³) of 38.5 grams of platinum if the density of platinum is 21.5 g/cm³. Give your answer to 2 decimal places
Answer:
[tex]\boxed {\boxed {\sf v\approx 1.79 \ cm^3}}[/tex]
Explanation:
The formula of density is:
[tex]d=\frac{m}{v}[/tex]
If the formula is rearranged for volume, it becomes:
[tex]v=\frac{m}{d}[/tex]
The mass of the platinum is 38.5 grams.
The density is 21.5 grams per cubic centimeter.
[tex]m=38.5 \ g \\d= 21.5 \ g/cm^3[/tex]
Substitute the values into the formula.
[tex]v=\frac{38.5 \ g}{ 21.5 \ g/cm^3}[/tex]
Divide. Note that the grams (g) will cancel each other out.
[tex]v=1.79069767 \ cm^3[/tex]
Round to 2 decimal places (hundredth place). The 0 in the thousandth place tells us to leave the 9 in the hundredth place.
[tex]v\approx 1.79 \ cm^3[/tex]
The volume is about 1.79 cubic centimeters.
Answer:
D = 1.79 cm^3
Explanation:
Use the formula Volume = Mass / Density with what you've been given.
V = 38.5 g / 21.5 g/cm^3
V = 1.790697674 = 1.79 cm^3
HELP FAST PLEASE!!
Producers are able to produce more of a good and to make more profit from __________. A. high prices B. limited demands C. high production costs D. government involvement
Answer:
the answer is A
Explanation:
i took the test on edg. sorry it is so late:(
Answer:A
Explanation:
How many moles would there be in 500,000,000,000 atoms of silver? Show your calculation
and answer in unit
Answer: 3.01 * 10^35
Explanation:
500,000,000,000 * 6.02 * 10^23
There are 3 [tex]\rm \times\;10^3^5[/tex] moles of silver present in the 500,000,000,000 atoms of silver.
According to the concept of molar mass:
1 atom = [tex]\rm 6.023\;\times\;10^2^3[/tex] moles
500,000,000,000 atoms of silver can be written as:
5 [tex]\rm \times\;10^1^1[/tex] atoms of silver.
1 atom = [tex]\rm 6.023\;\times\;10^2^3[/tex] moles
5 [tex]\rm \times\;10^1^1[/tex] atoms = 5 [tex]\rm \times\;10^1^1[/tex] [tex]\times[/tex] [tex]\rm 6.023\;\times\;10^2^3[/tex] moles
5 [tex]\rm \times\;10^1^1[/tex] atoms = 30.115 [tex]\rm \times\;10^3^4[/tex] moles
= 3 [tex]\rm \times\;10^3^5[/tex] moles.
The moles of silver are present in the 500,000,000,000 atoms of silver are 3 [tex]\rm \times\;10^3^5[/tex] moles.
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A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. The first indication that a chemical change was taking place could be observed when----
Answer:
Is when there is an increase in the temperature of the liquid
Explanation:
Increase in temperature of the liquid is an indication that chemical change occur because chemical change occur through process of chemical reaction and it involve when two or more substances combine together to form new substances which is as a result of change in chemical composition. The crystals dissolved in water to form another new solution and it became warm and this indicate a chemical change, new substances are formed as a result of increase in temperature.
Before the quarry was dug, the land contained more vegetation. What impact has this change most likely
had on the local ecosystem?
Answer: loss of nutrients
Explanation:
the quarry was dug up and vegetation started dyeing. the quarry was probably rich with nutrients.