Answer:
The exception in the order of the periodic table is;
B.) Cobalt is located before Nickel even though it has a higher average atomic mass
Explanation:
The Russian chemist Dmitri Mendeleev who formulated the periodic law, observed that the arrangement of the atoms in an order of their increasing atomic mass resulted in a table that show a recurring pattern in the properties of the elements within each group
However, cobalt (atomic mass 58.93 amu) which was heavier than nickel (atomic mass 58.71) was placed before nickel due to the similarities of its chemical properties to the group in which it was placed
It was later observed that cobalt with 27 protons was rightly placed to come before nickel that has 28 protons in the periodic table classified by atomic numbers which is the proton number.
What is one cubic centimeter equivalent to
0.06102374 in^3
or in scientific notation would be 1.0 x 10^-6 m^3
What is one way to reduce the use of nonrenewable energy resources?
Answer:
By increasing the use of renewable energy sources!
Explanation:
To satisfy the need for power in (whatever country you live in) you need to have a certain quota of power. This is typically achieved by the use of oil and natural gasses. You can also achieve it though by using thermal energy as well as solar energy (Solar Panels), and wind, kinetic, and water. (Windmills and Watermills). These are quite difficult to make and cost a lot of money to produce and kept running smoothly. So to cut back on cost we just use oil/natural gasses. But to answer your question, we need more renewable energy to make nonrenewable energy less used!
A man does 150 J of work by pulling a vacuum cleaner horizontally with a force of 50.0 N. How far did the man pull the vacuum cleaner?
Answer:
The answer is 3 mExplanation:
The distance covered by the vacuum cleaner can be found by using the formula
[tex]d = \frac{w}{f} \\ [/tex]
w is the workdone
f is the force
From the question we have
[tex]d = \frac{150}{50} = \frac{15}{5} \\ [/tex]
We have the final answer as
3 mHope this helps you
A wavelength is the___
of one ____ ____
Answer: A wavelenghth is the distance between successive crests of one wave.
How many atoms is 3.49x1032 moles of KOH?
2.1 x 10⁵⁶ atoms
Further explanationThe mole is the number of particles(molecules,atoms,ions) contained in a substance
1 mol = 6.02.10²³
number of atoms :
[tex]\tt 3.49\times 10^{32}\times 6.02\times 10^{23}=2.1\times 10^{56}[/tex]
Depicted below you will see the molecules COH2 and SO3 . Why is COH2 polar while SO3 isn’t?
Answer:
See explanation
Explanation:
When we look at SO3 we will notice that the compound is trigonal planar and it is symmetric. This means that it has equal charge distribution hence its dipoles cancel out resulting in a zero net dipole moment.
However, COH2 is also trigonal planar but is non-symmetric. Hence, its dipole moments do not cancel out, hence the molecule has a resultant dipole moment and is a polar molecule
Physics is ______ about
how things move and why things move
Answer: Physics is about
how things move and why things move
Explanation:
What is the mass of 2.1 moles of Sodium Chloride?
Answer:
120 g NaCl
General Formulas and Concepts:
Reading a Periodic TableDimensional Analysis (DA)Writing compoundsExplanation:
Step 1: Define
2.1 moles NaCl (sodium chloride)
Step 2: Define conversions
Molar Mass of Na - 22.99 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of NaCl - 22.99 + 35.45 = 58.44 g/mol
Step 3: Convert (DA)
[tex]2.1 \ mol \ NaCl(\frac{55.84 \ g \ NaCl}{1 \ mol \ NaCl} )[/tex] = 122.724 g NaCl
mol NaCl and mol NaCl cancel outleft with g NaCl as final unitsStep 4: Check
We have 2 sig figs. Follow sig fig rules.
122.724 g NaCl ≈ 120 g NaCl
The logarithimic formula is not as complicated as it seems. For example, what is the pH of a solution with a H+ concentration of 1.00 x 10^-4 M?
Answer:
pH of given solution is 4
Explanation:
Given data:
pH of solution = ?
Concentration of H⁺ = 1.00 ×10⁻⁴M
Solution:
Formula:
pH = -log[H⁺]
pH = -log[ 1.00 ×10⁻⁴]
pH = 4
Thus, the pH of given solution is 4.
Name the change of state when a liquid becomes a gas
Answer: Evaporation
Explanation: the process of turning from liquid into vapor
In the photo above what does the Frisbee represent? Explain why.
10 POINTS The equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 C2H6O + 3O2?
FeCl3 + NH4OH Fe(OH)3 + NH4Cl
CH4 + O2 CO2 + H2O
Fe + H2SO4 Fe2(SO4)3 + H2
PCl5 + H2O HCl + H3PO4
Answer:
the answer is D
Explanation:
I just took the test
To see the number of atoms of an element we need to multiply the stoichiometry to the the number that is written on the foot of that element. Equation 3 would have the same coefficients in the same order as [tex]\rm 2CO_2 + 3H_20\rightarrow C_2H_6O + 3O_2[/tex].
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side.
[tex]\rm FeCl_3+ NH_4OH \rightarrow Fe(OH)_3+ NH_4Cl[/tex]
Balance Cl by adding coefficient to NH[tex]_4[/tex]Cl
[tex]\rm FeCl_3+ NH_4OH \rightarrow Fe(OH)_3+ 3NH_4Cl[/tex]
Balance O by adding coefficient to NH[tex]_4[/tex]OH
[tex]\rm FeCl_3+ 3NH_4OH \rightarrow Fe(OH)_3+ 3NH_4Cl[/tex]
[tex]\rm CH_4 + O_2\rightarrow CO_2 + H_2O[/tex]
Balance H by adding coefficient to H[tex]_2[/tex]O
[tex]\rm CH_4 + O_2\rightarrow CO_2 + 2H_2O[/tex]
Balance O by adding coefficient to O[tex]_2[/tex]
[tex]\rm CH_4 + 2O_2\rightarrow CO_2 + 2H_2O[/tex]
[tex]\rm Fe + H_2SO_4 \rightarrow Fe_2(SO4)_3 + H_2[/tex]
Balance sulfur by adding coefficient to H₂SO₄
[tex]\rm Fe + 3H_2SO_4 \rightarrow Fe_2(SO4)_3 + H_2[/tex]
Balance hydrogen by adding coefficient to H₂
[tex]\rm Fe + 3H_2SO_4 \rightarrow Fe_2(SO4)_3 + 3H_2[/tex]
Now Balance Fe by adding coefficient to Fe
[tex]\rm 2Fe + 3H_2SO_4 \rightarrow Fe_2(SO4)_3 + 3H_2[/tex]
[tex]\rm PCl _5 (s) + H _2 O (l) \rightarrow H _3 PO _4(aq) + HCl (aq)[/tex]
can be balanced as
[tex]\rm PCl _5 (s) + 4 H _2 O (l) \rightarrow H _3 PO _4(aq) + 5 HCl (aq)[/tex]
Therefore, equation 3 would have the same in the same order as [tex]\rm 2CO_2 + 3H_20\rightarrow C_2H_6O + 3O_2[/tex].
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Atoms are not changed in a reaction. They are just _____
A.conservation
B.equal
C.Equation
D.product
E.reactant
J.rearranged
Help please I need the answer ASAP
Atoms are not created or destroyed in a chemical reaction, they are just rearranged from the reactants to form the products. This is the reason why symbol equations must be balanced.
i need help with chem ????????
Answer:
69
Explanation:
pls help me
what bond does not burn
Answer:
Iconic bonds don't burn easily
Explanation:
Covalent bonds are non metals. Covalent bond (sharing), low temp, low temp, burn easily, poor, polar covalent is good and non-polar covalent is bad.
Ionic - metals and nonmetals, ionic bond is when electrons are gained or lost, high temp, high temp, doesn't burn easily, good, good
Answer:
Explanation:
what do you mean by bond?
Which determines the reactivity of an alkali metal?
Answer:
Its ability to lose electrons
Explanation:
The attraction from the positive nucleus to the negative electron is less. This makes it easier to remove the electron and makes the atom more reactive.
Answer:
When it's able to lose electrons when it bonds with another substance.
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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1. Pure Substances can be broken down by physical changes.
True
False
Answer:
False
Explanation:
Ostriches don’t use their wings for flight, but they do use them for other functions, such as mating rituals and balance. Many ancestors of ostriches did fly. What can you conclude about ostrich behavior from this information? A. Ostriches inherited the genes for wings from their ancestors, even though the function of these structures changed. B. Ostriches developed mutations in their wings to willfully adapt to their current environment. C. Ostriches lack a close evolutionary relationship with these ancestral birds. D. In the near future, ostriches will have no wings because they have no need for them. Reset Next
Answer:
A. Ostriches inherited the genes for wings from their ancestors, even though the function of these structures changed.
Explanation:
What we can conclude from this behavior is that ostriches inherited the genes for wings from their ancestors even though the function of these structures have changed.
Instead of the wings becoming vestigial to non-usage, the ostriches simply adapted them for other purposes. Mutation allows for this change in functions of body parts of organisms to occur.Find the percent composition of a compound that contains 2.63 g of carbon, 0.370 g of hydrogen and 0.580 g of oxygen in a 3. 58 g sample of the compound.
Answer:
Carbon- 73.5%
Hydrogen - 10.3%
Oxygen - 16.2%
Explanation:
To find the percentage composition of each atom;
Carbon:
2.63/3.58 × 100 = 73.5%
Hydrogen:
0.370/3.58 × 100 = 10.3%
For oxygen:
0.580/3.58 × 100 = 16.2%
Taking into account the definition od percentage composition, the percent composition of each compound in this sample is
Carbon: 73.46 %Hydrogen: 10.34 %Oxygen: 16.20 %
The Percentage Composition is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.
To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.
In this case, you know that a compound that contains 2.63 g of carbon, 0.370 g of hydrogen and 0.580 g of oxygen in a 3. 58 g sample of the compound.
Dividing the mass amount of each element present in the compound by the mass of the sample and multiplying it by 100 to obtain a percentage value, the percentage composition of each element is obtained:
Carbon: [tex]\frac{2.63 g}{3.58 g}x100=[/tex] 73.46 %Hydrogen: [tex]\frac{0.37g}{3.58 g}x100=[/tex] 10.34 %Oxygen: [tex]\frac{0.58 g}{3.58 g}x100=[/tex] 16.20 %Finally, the percent composition of each compound in this sample is
Carbon: 73.46 %Hydrogen: 10.34 %Oxygen: 16.20 %Learn more about percent composition:
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if a baloon filled with dry hydrogen weighs 35 gram,but weighs 440 grams when filled with the vapour of an organic compound. calculate the vapour density and RMM of the organic compound.
Answer:
1) The vapor density of the organic compound is approximately 12.57
2) The relative molar mass (RMM) of the organic compound is approximately 25.14 grams
Explanation:
1) The mass of the balloon filled with dry hydrogen = 35 grams
The mass of the balloon filled with vapor of an organic compound = 440 grams
The vapor density = (Weight of a given volume of gas)/(Weight of equal volume of hydrogen)
The vapor density of the organic compound = (440)/(35) ≈ 12.57
The vapor density of the organic compound ≈ 12.57
2) The relative molar mass (RMM) = 2 × vapor density
The relative molar mass (RMM) of the organic compound = 2 × vapor density of the organic compound
The relative molar mass (RMM) of the organic compound ≈ 2 × 12.57 ≈ 25.14 grams
The relative molar mass (RMM) of the organic compound ≈ 25.14 grams
30 POINTS!!!
A chemical reaction that has the general formula of AB + C –> CB + A is best classified as a ______
reaction.
A. Synthesis
B. Polymerization
C. Decomposition
D. Oxidation
E. Replacement
Answer:
E. Replacement
Explanation:
A chemical reaction that has the general formula of AB + C --> CB + A is best classified as a replacement.
Answer:
A chemical reaction that has the general formula of AB + C → CB + A is best classified as a reaction.
Explanation:
e- replacement
on edge
How do volcanos such as ojos del salado form?
Answer:
Deep inside Earth, between the molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt.
Explanation: hot molten rock, ash, and gases escape from the volcano
how many moles of carbon are in 3.0 moles of c6h12o6
Answer:
i.e. mass of 1 mole of glucose, C6H12O6 = (6 × 12.01 + 12 × 1.01 + 6 × 16.00) g = 180.18 g (using atomic weight data to 2 decimals) 1 mole of carbon atoms weighs 12.01 g and there are 6 moles of C atoms in 1 mole of glucose, so the mass of carbon in 1 mole of glucose = 6 × 12.01 g = 72.06 g.
Based on the given reactants, what type of chemical reaction will take place?
Zn + 02 -
Answer:Classify each of the following chemical reactions.
S + O2 → SO2
CaCl2 + 2AgNO3 → Ca(NO3)2 + 2AgCl
Zn + CuSO4 → Cu + ZnSO4
2Na2O → 4Na + O
Explanation:
synthesis and combustion
double replacement
single replacement
decomposition only
How do particles in a sample of matter interact when the sample is in a different state (solid,
liquid, and gas)?
HELP ASAP PLEASE I'LL GIVE BRAINLIEST
Answer:
Radiowave,Microwave, Infared,UV,X-Ray, Gamma
radio,microwave, ultraviolet,x ray,gamma ray
Explanation:
I looked it up at a NASA link
Complete the sentence by using the drop-down menus
to choose the words that describe the image most
accurately
To make an omelet, first
the egg and then let
the insides slide
into the bowl.
Answer:
1st one: crack
2nd: carefully
Explanation:
Answer:
Crack and then carefully
Explanation:
I just did it in edgen 2020
How many Joules of energy are needed to raise 87.3 grams of aluminum from 22,5 C to 47.3. C. The specific heat of aluminum is 0.903 V&C.
Joules
Energy needed : 1955.03 J
Further explanationHeat can be formulated:
Q=m.c.Δt
Q=heat,J
m=mass,g
c=specific heat,J/g °C
Δt=temperature, °C
m=87.3 g
Δt= 47.3-22.5=24.8 °C
c=0.903 J/g °C
[tex]\tt Q=87.3\times 0.903\times 24.8=1955.03~J[/tex]
7. At what structures in the lungs do the exchange of oxygen and carbon dioxide take place?
A. Bronchi B. Alveoli C. Bronchioles D. Trachea
LA
Answer:
Answer is Alveoli
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