Answer:
Shapes suitable for humans to sit on it, three to four legs, a flat seat, and a back. Anything with such a shape is "chair", regardless of the peculiarities of its shape or its composition (what it is made of); anything without such a shape is a "not chair", even if you can sit on it. And a chair is classified as physical.
Explanation:
The mass % of C in methane (CH4) is?
Answer:
74.87% Carbon
Explanation:
The molecular mass of CH4 is 16.042 g/ mole.
X=(100 × 12.01) / 16.042= 74.87%
Answer:
[tex]\boxed {\boxed {\sf 74.87 \% \ C}}[/tex]
Explanation:
We want to find the mass percent composition of carbon in methane: CH₄
First, we must calculate the gram formula mass, also called the molar mass. Use the values for mass found on the Periodic Table. Look for carbon and hydrogen.
C: 12.011 gH: 1.008 gThere is no subscript after C, so there is just 1 atom. There is a subscript of 4 after H, so there are 4 atoms of hydrogen. We must multiply hydrogen's mass by 4.
C: 12.011 g H₄: 1.008 g * 4= 4.032 g CH₄= 12.011 g+ 4.032 g=16.043 gCalculate the percent composition.
[tex]\frac {mass \ of \ part}{mass \ of \ whole} *100[/tex]
The part is the carbon, or 12.011 grams.
The whole is the entire compound, CH₄, or 16.043 grams.
[tex]\frac { 12.011 \ g }{ 16.043 \ g} *100[/tex]
[tex]0.748675435*100\\74.8675435[/tex]
Let's round to the nearest hundredth. The 7 in the thousandth place tells us to round the 6 to a 7.
[tex]74.87 \% \ C[/tex]
The mass percent of carbon is 74.87%
Iron is a transition element. transition elements that make them different from non-transition metals
such as magnesium.
Answer:
Transition metals differ from the non-transition metals such as magnesium in the following ways;
They have variable oxidation statesFormation of complex ions.Formation of colored ions.Transition metals both in the elemental and compound forms can serve as catalysts.Explanation:
Transition elements comprise of those elements in the d-block of the periodic table and which have incompletely-filled d-orbitals.
The transition elements are all metals and has the characteristic physical properties of metals such as;
high melting and boiling points,good conductors of heat and electricity,metallic lusterhigh densitiesmalleability and ductilityHowever, their chemical properties differ from those of the non-transition metals such as magnesium in the following ways;
They have variable oxidation states - the transition metals exhibit variability in their oxidation states because of the close similarity in the energies of the 4s and 3d electrons which are available for bond formation. For example, while magnesium has only one oxidation state of +2, vanadium a transition metal can have oxidation states of +2, +3, +4 and +5.Formation of complex ions - A complex ion consists of a central metal atom or ion to which several other atoms, ions or molecules are bonded. For example, blue tetramine copper (ii) ion, [Cu(NH₃)]²⁺.Formation of colored ions - unlike non-transition metal ions, the ions of transition metals are usually colored. For example, Copper (ii) ions, Cu⁺ are blue, Chromium (ii) ions, Cr³⁺, are green, etc.Transition metals both in the elemental and compound forms can serve as catalysts. For example, finely divide nickel serves as a catalyst in the hydrogenation of vegetable oil to margarine, while vanadium (v) oxide serves as a catalyst in the contact process for the manufacture of tetraoxosulfate (i) acid.Please help:/ I can’t figure out the answer
Why are digital signals an accurate and reliable way to record and send information?
Because digital information is frequently encrypted and compressed, digitizing signals is safer.
What is digital signal?A signal path is one that expresses data as a series of distinct values; it is unable to take on one of a limited number of different values at any given moment. An analog signal, on the other hand, conveys continuous values; anywhere at given instant, it represents an actual number within such a continuous value range.
Simple digital signals encode information in discrete analog level bands. All levels in a value band indicate the very same information state. The signal throughout most digital circuits can have two correct values; this is known as a binary signal as well as logic signal. Because digital information is frequently encrypted and compressed, digitizing signals is safer.
Therefore, because digital information is frequently encrypted and compressed, digitizing signals is safer.
To know more about digital signal, here:
https://brainly.com/question/27853277
#SPJ2
Consider the pair of solvolysis reactions. Draw the organic products, then predict the type of substitution mechanism and compare the expected rates.
Answer:
See explanation
Explanation:
Solvolysis is a chemical reaction in which the solvent, such as water or alcohol, is one of the reagents and is present in great excess of that required for the reaction. The solvents act as or produce electron-rich atoms or groups of atoms (nucleophiles) that displace an atom or group in the substrate molecule(Encyclopedia Britannica).
For the two reactions, the organic product is the same(the product is drawn in the second image attached). The both reactions occur by SN1 mechanism since the substrate is a tertiary alkyl halide. The nucleophile is CH3OH and the rate of reaction depends on the concentration of the alkyl halide and independent of the concentration of methanol present.
Therefore, changing the volume of the solvent has no effect on the rate of reaction. The two reactions proceed at exactly the same rate since the initial concentration of the alkyl halide is the same for both reactions.
Consider two reactants (A and B) that when mixed form a precipitate C, which can be filtered, dried, and then weighed. Carlos attempts to find the stoichiometric ratios in which A and B mix, by mixing different volumes of the same concentration of solutions of A and B (0.50 M). He records the following data:
Run Vol A (mL) Vol B (mL) Mass C (g)
1 10.0 10.0 1.17
2 20.0 10.0 2.33
3 30.0 10.0 3.50
4 40.0 10.0 3.50
Assuming that the products of the reaction are C and D, and that the stoichiometric coefficients for C and D are 1 and 2 respectively, the balanced chemical reaction will be
( ) A + ( ) B â 1 C + 2 D
Answer:
3A + B → C + 2D
Explanation:
Recall that:
[tex]\text{molarity} = \dfrac{no \ of \ moles}{volume \ of \ the \ solution}[/tex]
So;
[tex]\text{no \ of \ moles= molarity * volume \ of \ the \ solution}[/tex]
From the above table given in the question; we can have the following table:
Run moles of A moles of B Limiting reagent
1 0.5× 10⁻² 0.5× 10⁻² A and B are equal
2 1.0 0.5× 10⁻² 0.5× 10⁻² A
3. 1.5× 10⁻² 0.5× 10⁻² A
4 2.0× 10⁻² 0.5× 10⁻² B
Also, provided that the stoichiometric coefficients for C and D = 1 & 2 respectively.
Then, the stiochiometric ratio for A:B = [tex]\dfrac{1.5\times 10^{-2}}{0.5 \times 10^{-2}}[/tex]
[tex]= \dfrac{3}{1}[/tex]
Thus, the balanced equation is:
3A + B → C + 2D
how can natural selection can cause organisms to change over generations.
Answer:
Natural selection changes how well a species can survive in an environment.
Explanation:
I'm not the best at biology, but natural selection a term we use that's describes nature's way of choosing the strongest to survive. The species with the strongest adaptations will survive while the others will die off. For example, if a school of fish was forced to live in a colder habitat than usual, over many years some fish will adapt to that environment and be able to withstand it. But, some fish won't get those adaptations and be killed off. But, future generations will be born with that ability to withstand the cold environment and it would become normal. So, natural selection changes the way a species lives. Hope this helps
A marshmallow is toasted over a campfire. Is this a physical or a chemical change?
Claim:
Evidence 1:
Reasoning 1:
Evidence 2:
Reasoning 2:
Answer:
Chemical Change
Explanation:
It is changeing color and taste
The toasting of marshmallows over a campfire is a chemical reaction.
What is a chemical change?A chemical change, often known as a chemical reaction, is the transformation of one or more components into new and distinct molecules or compounds.
Claim: When you toast marshmallows, the heat produces a chemical process that results in the formation of water molecules, which eventually evaporate, leaving carbon behind.
Evidence 1: The marshmallow become brown.Reasoning 1: When you toast sugar, it changes its chemical composition to form caramel, and the process is called caramelization.Evidence 2: The marshmallow melts.Reasoning 2: When the marshmallow is toasted, it melts down and becomes brown. This is a chemical change.Thus, these are the reasons why the toasting of marshmallows is a chemical change.
Learn more about chemical change, here:
https://brainly.com/question/1161517
How many molecules of sugar C6H1206 are in a mole?
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.
24. According to the author, the term avant-garde
most nearly means:
F. a particular art movement founded
internationally in the early 1900s.
G, a form of painting and sculpture
associated primarily with France.
H. art that is not the standard of the time.
J. art that has modernist roots.
Dinitrogen tetraoxide is a colorless gas that dissociates into nitrogen dioxide, a reddish brown gas.
a. True
b. False
Answer:
False
Explanation:
Disassociation of Dinitrogen tetraoxide is shown below -
N2O4(g) ⇌ 2NO2(g)
Nitrogen dioxide gas is deep red-orange in color. However, in presence of aerosols, this gas appears reddish-brown in color.
Hence the given statement is False
Which part of a plant creates pollen?
AME
A
pistil
B
stamen
с
petal
D
stem
Answer:
carpel
Explanation:
the pollen producing part of a flower, usually with a slender filament supporting the anther.
Explain the actinide contraction and its consequences
Answer:
Atomic and ionic size –
As the atomic number increases, the atomic size increases and effective nuclear charge also increases which attracts the outermost shell more effectively. So, as we move left to right means from actinium to lawrencium in the actinide series, there is gradual decrease in the the atomic or ionic radii with increase in atomic number. This steady decrease I atomic size is called actinide contraction. The actinide contraction is analog to the lanthanide contraction.
Cause of Actinide contraction –
The main reason of the actinide contraction is the imperfect shielding of the one 5f-electron by another 5f- electron in the same shell. Due to poor shielding effect of the 5f electrons, effective nuclear charge increases which causes the contraction in atomic size. When one electron is added to the 5f-orbital every time means proton keeps on increasing due to which the nuclear charge increases irregularly which causes the poor shielding effect.
CLICK THE WORD DOC AND IT WILL HAVE THE ANSWER
PLEASE MARK ME AS BRAINLIEST PLEASEEEEEEE
help w this please and thank you.
Answer: see below
Explanation: filling the blanks in this order
point source
Pollution
Wastewater
waste
Nonpoint source
Contaminants
fertiliser
suburban yards
Which of the following pairs of aqueous solutions produce a precipitate?
Group of answer choices
Cu(NO3)2 + Na2S
NaCl + LiCl
NH4NO3 + Li2CO3
None of the above solution pairs will produce a precipitate
AgNO3 + Cu(NO3)2
Answer:
NaCi + LiCl is the correct answer
The pairs of aqueous solutions produce a precipitate is NaCl + LiCl will produce a precipitate.
What is aqueous solution?Aqueous solution is defined as any solution in which water is used to dissolve or break down a substance.
There are basically three types of aqueous solution
Precipitation reactionAcid base reactionRedox reactionNon aqueous solution is defined as a solution formed by dissolving a solute in a solvent other than water.
There are basically four types of non aqueous solution
Aprotic solventProtogenic solventProtophilic solventAmphiprotic solventThus, the pairs of aqueous solutions produce a precipitate is NaCl + LiCl.
To learn more about aqueous solutions, refer to the link below:
https://brainly.com/question/26856926
#SPJ2
What the mass in grams of 6.25 mol of copper(II) nitrate
Answer:
Mass of 6.25 moles of copper(II) nitrate = 1025 grams
Explanation:
Let us calculate the molar mass of Copper (II) nitrate
Molecular formula = Ca(NO₃)₂
Atomic mass of Ca = 40 g/mol
Atomic mass of N =14 g/mol
Atomic mass of O = 16 g/mol
molar mass of Ca(NO₃)₂ = 40 + (14 X2) +( 6X16) = 164 g/mol
moles=\frac{mass}{molarmass}moles=
molarmass
mass
therefore
mass = moles X molar mass
mass = 6.25 X 164 = 1025 grams
How many moles are there in 3.01 x 1024 atoms of argon?
Answer:
Try this for answer 3082.24
Copper roofs on houses form patina (copper carbonates) over the course of years due to the reaction with oxygen, carbon dioxide and water in the air. Which of the following statements is incorrect for this process?
A) The reaction has a low activation energy.
B) The reaction has a low reaction rate.
C) The formation of patina would occur faster during the summer than the winter.
D) The formation of patina would occur slower at higher altitudes due to lower concentration of reactant. E) Adding a catalyst would increase the rate of patina formation.
Answer:
The answer is "Choice A".
Explanation:
In this question, the choice A is wrong because when the copper panels on houses produce a patina (copper oxide) through occur as a consequence of reactions from oxygen and water in the air, these reaction does not have low activation energy because lower activation energy that is stored in a faster response rate.
the electron configuration of an element in its ground state is illustrated above. which, if any, of the three principles that determine the most stable electron configuration of an element does this configuration disobey
Answer:
hello your question is incomplete attached below is missing part
answer : Pauli's exclusion principle
Explanation:
The principle that was disobeyed is Pauli's exclusion principle this is because the Pauli's exclusion principle states that no two electrons can have the same set of quantum number.
In Box A the two electrons , have the same spin which means they have the same quantum number ( disobeys Pauli's exclusion principle )
Find the mass, in grams, of 4.10x1023 molecules of F2.
Answer:
25.88 g of F₂.
Explanation:
From the question given above, the following data were obtained:
Number of molecules of F₂ = 4.10×10²³ molecules
Mass of F₂ =?
From Avogadro's hypothesis,
1 mole of F₂ = 6.02×10²³ molecules
Next, we shall determine the mass of 1 mole of F₂. This can be obtained as follow:
1 mole of F₂ = 2 × 19 = 38 g
Thus,
38 g of F₂ = 6.02×10²³ molecules
Finally, we shall determine the mass of 4.10×10²³ molecules of F₂. This can be obtained as follow:
6.02×10²³ molecules = 38 g of F₂
Therefore,
4.10×10²³ molecules = 4.10×10²³ × 38 / 6.02×10²³
4.10×10²³ molecules = 25.88 g
Thus, 25.88 g of F₂ contains 4.10×10²³ molecules.
Round to 4 significant figures.
35.5450
Answer:
35.55 to nearest 0.01 or
hundredth place
Which change will cause more CO2 to form in a closed container?
Answer:
Option C Removing Na₂CO₃
Option E Heating the container.
Explanation:
The equation for the reaction is given below:
2NaHCO₃ (s) <=> Na₂CO₃ (s) + CO₂ (g) + H₂O (g)
Enthalpy change (ΔH) = 136 KJ
To obtain more CO₂ do the following:
1. Add more NaHCO₃
From chemical equilibrium, adding more NaHCO₃ means the reactant has increase. Thus, it (the reactant) will react to form more product (CO₂)
2. Removing any of the products. Removing any of the products implies that more reactants are in the reaction vessel than the product. Thus, the reactants will react to produce more products (CO₂)
3. Heating the container. Heating the container will lead to an increase in the temperature of the reaction. Since the enthalpy change (ΔH) is positive it means the reaction is endothermic. Thus, heating the container i.e increasing the temperature will favours the forward reaction i.e more products will be obtained.
NOTE: Pressure has no effect in the reaction system since there is no gaseous reactants.
Considering the options given above, C and E gives the correct answer to the question.
If the molecules in the above illustration react to form NH3 according to the equation N2 3 H2 2 NH3 , the limiting reagent is , the number of NH3 molecules formed is , and the number of molecules in excess is
Answer:
Follows are the solution to these question:
Explanation:
Given equation:
[tex]N_2+3H_2 \longrightarrow 2NH_3[/tex]
In this equation:
[tex]1 N_2[/tex] gives [tex]= 2NH_3[/tex]
so,
[tex]3N_2[/tex] gives= [tex]2 \times 3 = 6 NH_3[/tex]
similarly:
[tex]3H_2[/tex] gives [tex]= 2NH_3[/tex]
So, [tex]6H_2[/tex] gives = [tex]\frac{2}{3}\times 6=4NH_3[/tex]
Its limited reagent is =[tex]N_2[/tex]
The amount of [tex]NH_3[/tex] molecules were formed = 4.
and the amount of [tex]H_2[/tex] excess molecules are= 1
What is the volume if density of gold is 19.3g/ml and sand is 2.3g/ml with 1L of volume?
How can or organism's genetic traits affect its ability to survive?
Answer:
According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
What is the name of the functional group -CH2CH3?
A) propyl
B) methyl
C) ether
D) ethyl
Do not Shows signs of generated earthquakes within the last 10 000 years
what is the mass of a gold bar with the following dimensions" 30 cm X 10 cm X 10 cm if the density of gold is 19.3g/cm^3?
Answer:
Volume of the bar=10 X 4 X 5=200 cm^3
Mass=200 X 19.3=3,860 grams
Mass=3.86 Kilograms
Explanation:
How many moles are in 175 L of Ar?
OA) 7.81 mol
O B) 3920 mol
OC) 4.38 mol
OD 6991 mol
How many molecules are in 1.50 moles of hydrogen?
Answer:9.03*10^23
Explanation:
Imagine that each of the three containers in Model 2 contains krypton atoms. The atomic radius of a krypton atom is 88.00 pm. Assuming the atom is a solid sphere, calculate the volume of one krypton atom in liters.
Answer:
The volume of a krypton atom in liters = 2.86 x 10⁻²⁷ liters
Explanation:
The volume of a sphere is given by the formula below:
V = 4/3 (π)(r³)
where π = 22/7, radius of the krypton atom = 88.00 pm
However, 1 picometre (pm) = 1 x 10⁻¹⁰ cm, converting 88.00 pm to cm will be:
88.00 pm x 10⁻¹⁰ cm/ 1 pm = 88.00 x 10⁻¹⁰ cm
Substituting the values above in order to determine the volume of a krypton atom:
V = 4/3 x (22/7) x (88.00 x 10⁻¹⁰ cm)³
V = 2.86 x 10⁻²⁴ cm³
However, 1000 cm³ = 1 liter
Therefore, 2.86 x 10⁻²⁴ cm³ in liters will be:
2.86 x 10⁻²⁴ cm³/ (1000 cm³/1 liter) = 2.86 x 10⁻²⁷ liters
The volume of a krypton atom in liters = 2.86 x 10⁻²⁷ liters