Answer:
Cu^2+ (aq) + S^2- (aq) --> CuS (s)
Explanation:
Break up all the soluble compounds into their constituent ions to get the complete ionic equation, and cross off the ones that appear the same on both sides:
Cu (aq) + 2Cl(aq) + 2Na (aq) + S (aq) --> CuS (s) + 2Na (aq) + 2Cl (aq)
2Cl and 2Na appear on both sides of the arrow, so cross those out to get the net ionic equation.
Which types of changes must follow the law of conservation of mass?
Both physical and chemical changes
Neither physical nor chemical changes
Only physical changes
Only chemical changes
Answer: both
Explanation:
1. Convert the following temperatures to K.
a) 104 C
b) -3 C
Answer:
a) 377 k
b) 270 k
Explanation:
a) 104 + 273 = 377 k
b) -3 + 273 = 270 k
What is the molarity of the following solution? 3.48 mol in 4.1 L of solution
Answer:
molarity is moles/L so take the 3.48 and divide it by 4.1L
and get 0.848... and need to keep your answer to 2 digits as that is th emost precise measurement you have (the 4.1L)
so 0.85mol/L
Explanation:
2. Which BEST compares bacteria and viruses?
bacteria are smaller than viruses
O bacteria are living organisms, but viruses are not
O bacteria cause disease, but viruses do not
O bacteria have genetic material, but viruses do not
Answer:
the sewcond one bacteria are living organisms, but viruses are not
Explanation:
Answer:
Bacteria are living organisms, but viruses are not
Explanation:
All types of sciences use the same steps of the scientific method.
True
False
4. How many electrons do each of the following kinds of matter have in each atom? a. silver 47 protons electrons b. carton: 6 protons electrons Sodium: 11 protons electrons d. neon 10 protons electrons e. iodine. 53 protons electrons
Answer:
a. 47 electrons
b. 6 electrons
c. 11 electrons
d. 10 electrons
e. 53 electrons
Explanation: If you are talking about neutral atoms (where as the number of protons in an atom is equal to the number of electrons in the atom), or are just being introduced to atoms then the number of electrons will be equal to the number of protons the atom has. Or vice versa, the number of protons will be equal to the number of protons in an atom. For example, in a neutral atom, with 51 protons, will have 51 electrons. Or an atom with 5 electrons will have 5 protons.
Phosgene (Cl2CO), a poison gas used in World War I , is formed by the reaction of Cl2 and CO. The proposed mechanism for the reaction is
Cl2⇌2Cl(fast,equilibrium)
Cl+CO⇌ClCO(fast,equilibrium)
ClCO+Cl2→Cl2CO+Cl(slow)
What rate law is consistent with this mechanism?
Answer:
Rate = k [ClCO][Cl2]
Explanation:
Cl2⇌2Cl(fast,equilibrium)
Cl+CO⇌ClCO(fast,equilibrium)
ClCO+Cl2→Cl2CO+Cl(slow)
The rate determining step from which the rate aw is obtained from is the slowest step of a chemical reaction. In this reaction, the slowest step is;
ClCO+Cl2 → Cl2CO+Cl (slow)
The rate equation for the step is;
Rate = k [ClCO][Cl2]
ClCO is an intermediate and would eventually get cancelled out from the overall rate equation.
Phosgene is the chemical used in the formation of pesticides and ios poisonous. The rate law is given as, k [chloroformylradical][chlorine gas].
What is rate law?The rate law is the relation of the concentration of the reactants and the products with that the speed of the reaction.
The reaction for the formation of phosgene is given as,
[tex]\rm Cl_{2} \rightleftharpoons 2Cl\; (fast,equilibrium)\\\\\rm Cl+CO \rightleftharpoons ClCO\; (fast,equilibrium)\\\\\\rm ClCO+Cl_{2}\rightarrow Cl_{2} CO+Cl\; (slow)[/tex]
The rate law is determined by the rate-determining step which is the slowest step of the reaction.
[tex]\rm ClCO+Cl_{2}\rightarrow Cl_{2} CO+Cl\; (slow)[/tex]
The rate of the equation is given as,
[tex]\rm Rate = k [ClCO][Cl_{2}][/tex]
As COCl is an intermediate the third step will be the rate-determining step.
Therefore, the slow step determines the rate of the reaction.
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A 150 g sample of brass at 90.0 degrees Celsius is placed in a calorimeter cup that contains 230 g of water at 20.0 degrees Celsius. Disregard the absorption of heat by the cup and calculate the final temperature of the brass and water. Specific heat of water = 4.18 J/gC, specific heat of brass=0.380 J/gC.
Answer:
for brass
mass m1 =150g
t1=90°c
specific heat of brass s1=0.380 J/gC.
for water
t2=20°c
mass m2=230g
Specific heat of water s2= 4.18 J/gC,
Explanation:
we have
Q1=Q2
m1s1{t-t1)=m2s2(t2-t)
150×0.380(t-90)=230×4.18(20-t)
57t-5130=961.4×20-961.4t
57t +961.4t=19228+5130
1018.4t=24358
t=24358/1018.4=23.91=24°c is final temperature
is scrap metal pieces an example of a pure substance or a mixture ?
Answer:
mixture i think
Explanation:
Answer:
mixture
Explanation:
chemical equation for table salt and water
Answer:
sodium chloride—is NaCl.
Explanation:
Table salt is an ionic compound, which breaks into its component ions or dissociates in water. These ions are Na+ and Cl-. The sodium and chlorine atoms are present in equal amounts (1:1 ratio), arranged to form a cubic crystal lattice.
Answer:
Chemical equation for nacl dissolving in water
NaCl(s) H2O⇌ Na+(aq)+Cl−(aq) .
Explanation:
Which is element number 2&20
Answer:
2- Helium(He)
20-Calcium(Ca)
Answer:
Do you mean under 2 & 18 or under 4 & 20?
Explanation:
2 & 20 are in opposite sections of the periodic table. If you mean 2& 18 the element is Krypton or if you mean 4 & 20 the element is Strontium
anybody knows the answers
Answer:
Metal is a better conductor than plastic so its going to absorb any cooler temperatures while the plastic stays the same.
Explanation:
A blueberry bush uses energy from the Sun to make carbohydrates. Which set of energy transformations BEST describe this process?
A.radiant energy → chemical energy → nuclear energy
B.radiant energy → nuclear energy → chemical energy
C.nuclear energy → radiant energy → chemical energy
D.nuclear energy → chemical energy → radiant energy
Fusion powers the sun. This creates nuclear energy, which then goes to earth in the form of radiation. The plants get sunlight and photosynthesise (the process of getting glucose by sunlight). The answer should be C.
What is mass in grams of 2.30 moles of Aluminum?
62.1 g Al
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
2.30 mol Al
Step 2: Identify Conversions
[PT] Molar Mass of Al - 26.98 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 2.30 \ mol \ Al(\frac{26.98 \ g \ Al}{1 \ mol \ Al})[/tex]Multiply/Divide: [tex]\displaystyle 62.054 \ g \ Al[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
62.054 g Al ≈ 62.1 g Al
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How many molecules are there in 0.661 mol of O2 gas?
Answer:
One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.
An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?
0
24
28
52
Answer:
24
Explanation:
In an uncharged atom, the number of protons is always equal to the number of electrons. For example, carbon atoms include six protons and six electrons, so carbon's atomic number is 6.
Similarly, since an atom of chromium contains 24 protons, it also contains the same amount of electrons, which is 24.
Answer:
24 is your answer
Explanation:
What is the
difference between
dominant and
recessive traits
Answer:
An allele is dominant, it will express in a person the characteristic to which it is related. When an allele is recessive, it is less likely to express the function to which it is related. Recessive traits only occur when in a person both alleles are recessive.
Alleles are represented using upper and lowercase letters like B for brown eyes and b for blue eyes.
A. True
B. False
Answer:
A. True
Explanation:
Why do elements have different
properties?
I need help plz help me
Answer:
A
Explanation:
If a substance melts at 20oC, what is its freezing point?
Answer:
It is difficult, if not impossible, to heat a solid above its melting point because the heat that ... in a solid are packed in a regular structure that is characteristic of that particular substance.
#carryONlearningPicture a neutral S atom. This neutral atom will have
valence electrons. To reach a more stable configuration, this atom will
(gain, lose) electrons. The charge of the ion that forms will be
ASAP PLEASE
Answer:
has 6 valence electrons as its in group 6
the atom will gain electrons
the charge will be 2- as it will gain 2 electrons to be a full configuration
A chemist determined by measurements that 0.0500 moles of nickel participated in a chemical reaction. Calculate the mass of nickel that participated in the chemical reaction.
Answer:
2.94 grams Nickle
Explanation:
All they are asking is to convert moles to grams
To do this, find the atomic mass of nickel using the periodic table: 58.693 g
0.05 mol * 58.693 g/1 mol = 2.93465 grams
2AgF(aq)+Na2CO3(aq)=Ag2CO3(s)+2NaF(aq) net ionic equation
The net ionic equation is applied mainly in neutralization reactions, double displacement reactions and redox reactions. Therefore, the net ionic equation is Ag⁺(aq)+CO[tex]_3[/tex]²⁻(aq) [tex]\rightarrow[/tex]Ag[tex]_2[/tex]CO[tex]_3[/tex](s).
What is net ionic equation?
The net ionic equation represents a chemical equation of a reaction that give an idea of species that are really participating in the reaction. We can write net ionic equations for those electrolyte which are strong in water.
The balanced net ionic equation is
2AgF(aq)+Na[tex]_2[/tex]CO[tex]_3[/tex](aq)[tex]\rightarrow[/tex]Ag[tex]_2[/tex]CO[tex]_3[/tex](s)+2NaF(aq)
Ag⁺(aq) +F⁻(aq) +Na⁺(aq) +CO[tex]_3[/tex]²⁻(aq) [tex]\rightarrow[/tex]Ag[tex]_2[/tex]CO[tex]_3[/tex](s)+Na⁺(aq) +F⁻(aq)
Ag⁺(aq)+CO[tex]_3[/tex]²⁻(aq) [tex]\rightarrow[/tex]Ag[tex]_2[/tex]CO[tex]_3[/tex](s)
The net ionic equation cancels out ions that appear on both sides of the reaction arrow because they essentially don't participate in the reaction of interest.
Therefore, the net ionic equation is Ag⁺(aq)+CO[tex]_3[/tex]²⁻(aq) [tex]\rightarrow[/tex]Ag[tex]_2[/tex]CO[tex]_3[/tex](s).
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Ethyl ethanoate is used as a solvent for varnishes and in the manufacture of artificial leather. The formula below represents a molecule of ethyl ethanoate. Write the empirical formula for this compound.
Answer: The empirical formula for the ethyl ethanoate molecule is C2H4O.
Explanation:
Ethyl ethanoate is an ester which is formed together with water when ethanol reacts reversibly with acids. This can be illustrated below:
CH3COOH +. C2H5OH <----> CH3COOC2H5 +
H2O
Ethyl ethanoate can be used as an important solvent for varnishes and in the manufacture of artificial leather.
Different formulas can be used to illustrate a chemical compound.
--> Empirical formula of a compound is used to illustrate the simplest whole-number ratio of atoms in a compound.
--> Structural formula of the compound gives an illustration of how the atoms of the compound are bonded to each other.
--> Molecular formula shows the number of each type of atom in a molecule.
The formula given, the molecular formula of the compound is C4H8O2:
C4 H8 O2
4 : 8 : 2
Using 2 to divide through to get the simplest ratio gives rise to C2H4O as the empirical formula.
How much heat is required to convert 20.0 g of ice at 50.0⁰C to liquid water at 0.0⁰C? The specific heat of ice is 2.06 J/(g∙⁰C) and the heat of fusion of water is 334 J/g.
Answer:
8740 joules are required to convert 20 grams of ice to liquid water.
Explanation:
The amount of heat required ([tex]Q[/tex]), measured in joules, to convert ice at -50.0 ºC to liquid water at 0.0 ºC is the sum of sensible heat associated with ice and latent heat of fussion. That is:
[tex]Q = m\cdot [c\cdot (T_{f}-T_{o})+L_{f}][/tex] (1)
Where:
[tex]m[/tex] - Mass, measured in grams.
[tex]c[/tex] - Specific heat of ice, measured in joules per gram-degree Celsius.
[tex]T_{o}[/tex], [tex]T_{f}[/tex] - Temperature, measured in degrees Celsius.
[tex]L_{f}[/tex] - Latent heat of fussion, measured in joules per gram.
If we know that [tex]m = 20\,g[/tex], [tex]c = 2.06\,\frac{J}{g\cdot ^{\circ}C}[/tex], [tex]T_{f} = 0\,^{\circ}C[/tex], [tex]T_{o} = -50\,^{\circ}C[/tex] and [tex]L_{f} = 334\,\frac{J}{g }[/tex], then the amount of heat is:
[tex]Q = (20\,g)\cdot \left\{\left(2.06\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot [0\,^{\circ}C-(-50\,^{\circ}C)]+334\,\frac{J}{g} \right\}[/tex]
[tex]Q = 8740\,J[/tex]
8740 joules are required to convert 20 grams of ice to liquid water.
What happens when molecules absorb energy?
A. Nothing
B. The molecules move faster
C. The molecules move slower
Answer:
C. The molecules move slower
Explanation:
Q.3 Which the following statements about the given reaction are correct:
3Fe(s) + 4H2O(g)- Fe203 (S) + 4H2(g)
i) Iron metal is getting oxidized
ii) Water is getting reduced
iii) Water is acting as reducing agent
iv) Water is acting as oxidizine agent
a) (i), (ii) and (iii) b)(iii) and (iv)
c) (i), (ii) and (iv) d) (ii) and (iv)
Answer:
The statements which are correct are;
c) (i), (ii) and (iv)
Explanation:
The chemical equation is presented as follows;
2Fe(s) + 3H₂O(g) → 3Fe₂O₃(s) + 3H₂(g)
Therefore, we have;
i) The iron gains oxygen atoms and therefore gets oxidized
The iron loses 3 electrons each to become oxidized to Fe³⁺ in Fe₂O₃
ii) The water loses oxygen and therefore it is getting reduced
iv) The water donates oxygen and therefore it is acting as the oxidizing agent
The correct options are (i), (ii) and (iv).
A golfer hits a golf ball with a club. The mass of the ball is 0.05 kg. The ball accelerates at
What is the net force, to the nearest newton, that accelerates the ball?
Answer:
100 n im just guess
Explanation:
if it helps.
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