Answer:
Yes
Explanation:
All elements and compounds are regarded as pure substances. Whereas mixtures are classified as impure substances.
The characteristics of pure substances are:
they have homogenous parts. they have a definite compositionthey cannot be easily broken or separated by physical meansthey have unique sets of physical properties.These characteristics perfectly fits those of elements and compounds.
Which term refers to the process by which land is worn away by natural forces or human activity?
Answer:
erosion
Explanation:
erosion is the term that refers to the process by which land is worn away by natural forces or human activity.
Answer:
Erosion
Explanation:
Just took the test, hope it helps!
One sugar produced by photosynthesis is called
What advantage does a heterogeneous catalyst provide over a homogeneous catalyst in industrial processes?
Answer:
A heterogeneous catalyst can be easily separated from reactants.
Explanation:
Which two things are produced when a plant breaks down sugar to release energy
Answer:
Glucose is combined with oxygen and releases usable energy, carbon dioxide, and water. Cells can use that extra energy to power their functions. The energy isn't just floating around. It's stored in an excitable compound called ATP (adenosine triphosphate).
Explanation:
Answer: ATP(adenosine triphosohate) is released with water and carbon dioxide as byproducts.
Explanation: Remember that water, CO2,and ATP are the products of cellular respiration.
help help
What are the cells that respond to stimuli called?
Answer:
receptors which detect stimuli changes in the environment
Explanation:
A 24.63 gram sample of cobalt is heated in the presence of excess oxygen. A metal oxide is formed with a mass of 31.32 g. Determine the empirical formula of the metal oxide.
Explanation:
Moles of Co = 24.63 / 58.9 = 0.418
Moles of O = (31.32 - 24.63) / 16 = 0.418
Since the mole ratio is 1 : 1, the empirical formula is CoO.
The empirical formula of the metal oxide is CaO₂.
What is the empirical formula?The empirical formula is the simplest ratio of the number of atoms participating in the formation of a compound.
The chemical formula of any compound is based on two types of formula one is molecular formulas and another one is empirical formulas. Both the molecular formula and empirical formula represent the identity and number of the atom.
Given, the mass of the sample of the cobalt = 24.63g
The mass of the metal oxide = 31.32g
From the law of the conservation of mass:
The mass of the metal oxide - Mass of cobalt = mass of the oxygen
So the mass of the oxygen = 31.32 - 24.63 = 6.69 g
If mass 59 grams of the cobalt has moles = 1
Then 24.63 g of Cobalt will have moles = 24.63/59 = 0.417 mol
Similarly, 8 grams of the oxygen gas moles = 1
Then 6.69g of the oxygen has moles = 6.69/8 = 0.8362 mol
The simplest ratio of moles for Co = 0.417/0.417 = 1
For oxygen = 0.8362/0.417 = 2
Therefore the empirical formula of the metal oxide is CaO₂.
Learn more about empirical formula, here:
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For the chemical reaction:
ALOH3 (s)
= Al2O3 (s)
+ H20 (l)
Calculate the mass of water formed when 100 g of Al(OH)3 is heated. (AI = 27: 0 - 16; H = 1)
Answer:
35.1 g
Explanation:
Given data:
Mass of Al(OH)₃ = 100 g
Mass of water formed = ?
Solution:
Chemical equation:
2Al(OH)₃ → Al₂O₃ + 3H₂O
Number of moles of Al(OH)₃:
Number of moles = mass/molar mass
Number of moles = 100 g/ 78 g/mol
Number of moles = 1.3 mol
now we will compare the moles of Al(OH)₃ with water.
Al(OH)₃ : H₂O
2 : 3
1.3 : 3/2×1.3 = 1.95
Mass of water produced:
Mass = number of moles ×molar mass
Mass = 1.95 mol × 18 g/mol
Mass = 35.1 g
CAN SOMEONE PLEASE SEND ME A FILE FOR THE PROJECT
Answer:
ca you attach these two pdf ?? or provide the link to this document
A student predicted the reaction between hydrogen and oxygen gas would yield 125 of water. However, after measuring the water formed in the reaction, student determined that only 110 of water was actually formed. What is the percent yield of this reaction ?
Help
If the enantiomeric excess of a mixture is 81 %, what are the percent compositions of the major and minor enantiomer?
Answer:
major enantiomer = 90.5 %
minor enantiomer = 9.5 %
Explanation:
Assuming that the major isomer is in excess;
From, ee/2 + 50
ee = enantiomeric excess = 81%
% major =81/2 + 50 = 90.5 %
% minor = 100% - 90.5 %
% minor = 9.5 %
How many liters of 0.305 m K3PO4 solution are necessary to completely react with 187 ml of 0.0184M NiCl2 according to the balanced chemical reaction:
2 K3PO4(aq) + 3NiCl2(aq)>Ni3(PO4)2(s) +6 KCl(aq)
Answer:
0.00752L of 0.305M K₃PO₄
Explanation:
Based on the balanced chemical equation, 2 moles of K₃PO₄ react with 3 moles of NiCl₂.
To find the volume of K₃PO₄ we need to determine the moles of this compound required for a complete reaction finding moles of NiCl₂ and using the chemical equation:
Moles NiCl₂:
187mL = 0.187L * (0.0184mol / L) = 0.00344 moles NiCl₂
Moles K₃PO₄:
As 2 moles of K₃PO₄ react with 3 moles of NiCl₂:
0.00344 moles NiCl₂ * (2 mol K₃PO₄ / 3 moles NiCl₂) =
0.002294 moles of K₃PO₄
Volume of 0.305M K₃PO₄:
0.002294 moles of K₃PO₄ * (1L / 0.305moles K₃PO₄) =
0.00752L of 0.305M K₃PO₄
write the detailed structure of
A. C2H6 B. C4H10 C. C6H14 D. C7H16
A.
H₃C-CH₃
this is called ethane
B.
H₃C-CH₂-CH₂-CH₃
this is called butane
C.H₃C-CH₂-CH₂-CH₂-CH₂-CH₃
this is called hexane
D.
H₃C-CH₂-CH₂-CH₂-CH₂-CH₂-CH₃
this is called heptane
Answer:
1. a) Ethane (C2H6)
2. b) Butane (C4H10 )
3. c) Hexane (C6H14)
4. d) Heptane (C7H16)
During science lab, Jacob mixes together sodium hydroxide (NaOH) and hydrochloric acid (HCl). The two chemicals react to form sodium chloride (NaCl) and water (H2O).
Which of the following are reactants in the chemical reaction described above?
A.
hydrochloric acid and water
B.
sodium hydroxide and hydrochloric acid
C.
sodium hydroxide and sodium chloride
D.
sodium chloride and water
B. Sodium hydroxide and Hydrochloric acid
Further explanationChemical equations can be expressed in terms of
word reaction formula reactionIn a chemical reaction, there are several components, including reactants, products, and compounds that react in the form of solids, gases, and liquids
Reactants are compounds that react and form products
The reactants are generally to the left of the chemical equation and the products are to the right of the reaction
The statement of the word reaction above can be expressed by the reaction formula
[tex]\tt NaOH+HCl\rightarrow NaCl+H_2O[/tex]
This reaction is called a neutralization reaction because it involves acids(HCl) and bases(NaOH) and produces salt(NaCl)and water(H₂O)
From the reaction above, the reactants on the left are NaOH and HCl compounds
List the symbol and the bonding capacity of the 4 most common elements found in
organic compounds.
Answer:
The four elements most commonly found in living things are carbon, nitrogen, hydrogen, and oxygen.
Explanation:
The four elements most commonly found in living things are carbon, nitrogen, hydrogen, and oxygen.
When an element loses electrons, it forms *
Negative ions or anions
Positive ions or cations
neutral atoms or neutrons
alpha and beta particles
Answer: Positive ions or cations
Explanation:
The ions are formed when an atom gains or lose electrons.
The ions are classified into two which are called the cations and anions. The cation is classified as the positive charge formed by the loss of electrons. Example: [tex]Na^+[/tex] is formed by the loss of one electron by [tex]Na[/tex]
The anion is classified as the negative charge ion formed by the gain of electrons. Example : [tex]F^-[/tex] is formed the gain of one electron by [tex]F[/tex]
Thus when an element loses electrons, it forms positive ions or cations.
hich of the following is a typical cost associated with renting?
a.
closing costs
b.
down payment
c.
property tax
d.
security deposit
Answer:
D
Explanation:
The other three are related to
a. selling a home
b. buying a home
c. owning a home
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how much is a dogggggggggggggggggg
Answer:
it is 7
Explanation:
dogs are 7 HOPE THIS HELPED kidding i don get the question
Explanation:
DON"T EAT MY DOG OR I"LL EAT YOU
You better watch outYou better not cryYou better not poutPlz solve
A 20-g sample of sugar is dissolved in 59 g of water. The concentration of the solution is
Hint Water is a solvent
Answer:
0.98 M
Explanation:
Given data:
Mass of sugar = 20 g
Mass of water = 59 g
Concentration of solution = ?
Solution:
1 g = 0.01 L
59 g× 0.01 L/1 g
0.059 L
Concentration formula:
C = m/v
m = moles of solute
v = volume of solution
Number of moles of sugar:
Number of moles = mass/molar mass
Number of moles = 20 g/ 342.3 g/mol
Number of moles = 0.058 mol
Now we will calculate the concentration:
C = 0.058 mol/0.059 L
C = 0.98 mol/L
C = 0.98 M
how many moles of CO2 are in 210 liters at STP of the compound
Answer:
9.4 mol CO₂
General Formulas and Concepts:
Chemistry - Gas Laws
Using Dimensional AnalysisSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KExplanation:
Step 1: Define
210 L CO₂ at STP
Step 2: Identify Conversions
22.4 L = 1 mol at STP
Step 3: Convert
[tex]210 \ L \ CO_2(\frac{1 \ mol \ CO_2}{22.4 \ L \ CO_2} )[/tex] = 9.375 mol CO₂
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
9.375 mol CO₂ ≈ 9.4 mol CO₂
What do asteroids have in common with earth?
whats the answer giving brainliest please help
Answer:
C (I think)
Explanation:
the levels are higher than they have ever been
What is the oxidation number for S in the compound SO3? (Recall that o has an oxidation number of -2.)
0
O +2
O +4
O +6
The oxidation number for S in the compound SO₃ : +6
Further explanationThe formula for determining Oxidation Numbers :
1. Single element atomic oxidation number = 0.
Group IA (Li, Na, K, Rb, Cs, and Fr): +1
Group IIA (Be, Mg, Ca, Sr and Ba): +2
H in compound = +1, except metal hydride compounds (Hydrogen which binds to groups IA or IIA) oxidation number H = -1, for example, LiH, MgH₂, etc.
2. Oxidation number O in compound = -2, except OF₂ = + 2 and in peroxide (Na₂O₂, BaO₂) = -1 and superoxide, for example KO₂ = -1/2.
3 The oxidation number in an uncharged compound = 0,
Total oxidation number in ion = ion charge, Example NO₃⁻ = -1
The oxidation number for S in SO₃ :
[tex]\tt oxidation~number~of~S+3\times oxidation~number~of~O=0\\\\oxidaton~number~of~S+3\times(-2)=0\\\\oxidation~number~of~S=+6[/tex]
what is the atomic mass of an atom equal to?
Answer: A property closely related to an atom's mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.
Hope this helps....... Stay safe and have a Merry Christmas!!!!!!!! :D
Do you think chemistry has something to do with your life?In not less than 5 sentences but not more than 10 sentences try to identify situations during the day in which chemistry somehow played a part
Answer:
Chemistry can be applicable in many aspects which are
i) At school, through getting knowledge you can assess different aspect of chemistry, eg production of Chemicals.
ii) At hospital, also chemistry can be applicable in hospital because most of medicine and other materials are made up from chemistry application.
iii) Agriculture, through agricultural materials it simply because you can get more efficient through planted by using manures and fertilizer which are made up from chemistry application.
Acetylene gas is often used in welding torches because of the very high heat produced when it reacts with oxygen O2 gas, producing carbon dioxide gas and water vapor. Calculate the moles of oxygen needed to produce 1.3mol of carbon dioxide. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.
Answer:
3.2 moles of carbon dioxide
Explanation:
When C₂H₂ reacts with O₂ the chemical reaction is:
C₂H₂ + 5/2O₂ → 2CO₂ + H₂O
Where 1 mole of acetylene produce 2 moles of carbon dioxide.
Based on the chemical equation of this reaction, there are produced twice the moles of acetylene in moles of carbon dioxide assuming a compete reaction.
If 1.6 moles of acetylene reacts there are produced:
1.6 moles Acetylene * (2 moles Carbon Dioxide / 1 mole Acetylene) =
3.2 moles of carbon dioxide
calculate the packing efficiency of simple cubic unit cell.
Answer:
52.4%
Explanation:
Since a simple cubic unit cell contains only 1 atom. The packing efficiency of the simple cubic cell is 52.4 %
Question 1
The Relationship of Potential Energy is that when
increases or
increases, Potential Energy will increase also.
A
speed in a given direction
B
the amount of matter in an object
С
is a measurement for the amount of energy
D
Mass, Height
E
Mass, Velocity
Identify this instrument.
Microscope
Refracting telescope
Reflecting telescope
Radio Telescope
Answer:
I believe the answer is Reflecting Telescope
Explanation:
-leeknowishawt
Acetaminophen is the active ingredient in Tylenol.
a. Write the molecular formula of the compound.
b. What is the hybridization state of each C, N, and O atom?
Explanation:
a. Write the molecular formula of the compound.
Acetaminophen contains 8 carbon atoms, 9 Hydrogen atoms, 1 Nitrogen atom and 2 Oxygen atoms.
The molecular formular is given as; C8H9NO2
b. What is the hybridization state of each C, N, and O atom?
From the image attached;
All the carbon atoms in the benzene ring has hybridization of sp2.
The carbon that is doubly bonded (carbonyl) to the oxygen has hybridization of sp2
The last carbon to the right has hybridization of sp3
The hybridization of nitrogen in the compound is sp3 hbridized.
Oxygen atom in alcohol is sp3 hybridised
Oxgen in the carbonyl group is sp2 hybridized.
1
Aluminum metal and oxygen gas combine to produce aluminum oxide.
Which of these is the balanced equation for this reaction? *
Answer:
4 Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
Explanation:
Let's consider the unbalanced molecular equation when aluminum metal and oxygen gas combine to produce aluminum oxide. This is a combination reaction.
Al(s) + O₂(g) ⇒ Al₂O₃(s)
We can balance O atoms by multiplying O₂ by 3 and Al₂O₃ by 2.
Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
Finally, we multiply Al by 4 to get the balanced equation.
4 Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)