Answer:
b
Explanation:
What mass of Na2SO4 (sodium sulfate) is needed to make 2.5 L of 2.OM
solution?
O 1789
O 2849
O 7109
O 356 g
take it before its gone
An Introduction To Chemistry
Answer Sheet
Please provide your answer in the answer sheets!
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An Introduction To Chemistry
1. During his distinguished career this scientist received two unshared Nobel prizes. One for chemistry and one for peace.
Alfred Nobel
Marie Currie
Linus Pauling
Albert Einstein
2. The study of matter and the changes it undergoes describes the science of ______.
physics
mathematics
chemistry
biology
3. The _________ is the fundamental unit of matter.
atom
compound
nucleus
proton
4. The atom is composed of three subatomic particles known as _____, ____ and _______.
neutrals, electives and peeons
quarks, alpha rays and xenons
electrons, protozoans and electricals
protons, neutrons and electrons
5. Protons are _________ charged particles found in the nucleus of an atom.
neutrally
positively
negatively
brighltly
6. Electrons are ________ charged particles that orbit the nucleus of an atom.
negatively
positively
neutrally
brighltly
7. Neutrons are ________ particles found in the nucleus of an atom.
negatively charged
positively charged
uncharged
brightly
8. An ion is an atom or molecule that ___________.
is electrically neutral
is composed of two or more elements
is man made
carries a charge
9. Which of the following chemical species is a cation?
Cl-
H+
Au
HCO3-
10. The atomic number of an atom or element describes the number of _______.
electrons orbiting the nucleus
neutrons in the nucleus
alpha particles in the nucleus
protons in the nucleus
11. Mass is proportional to the number of _________ that make up an object.
atoms
cells
neutrons
protons
12. Weight is best described as _____________.
the number of atoms in an object
the pull of gravity on matter
the electrical charge on an ion
the number of electons in an atom
13. Atoms of any one type of element, such as gold, all posess the same number of _______.
electrons
neutrons
protons
nuclei
14. There are currently _______ known elements.
65
98
112
152
15. Element _______ are one or two letter abbreviations for the names of the elements.
numbers
atomic numbers
symbols
characters mass
16. Two or more elements that combine as a result of a chemical reaction form _____.
atoms
ions
mixtures
compounds
17. An example of a mixture would be __________.
a bar of pure gold
the air we breathe
sodium chloride salt
pure water
18. The three states of matter are ________, ________ and _________.
atoms, molecules and compounds
atoms, compounds and mixtures
solids, liquids and gases
solids, gases and steam
19. The least dense and most energetic of the three states of matter is ____.
the gaseous state
the liquid state
the solid state
the elemental state
20. All measurements must consist of both ____________.
a size and a shape
a price and a volume
a number and a unit
a color and a number
21. Density is a physical property that refers to _____________.
the number of atoms in an object
the weight of an object
the mass of an object relative to its volume
the weight of an object relative to its cost
22. A kilogram is equal to ________ grams.
1
10
100
1,000
23. There are _______ centimeters in a meter.
1
10
100
1,000
24. Measurements are _________ because of equipment error and human judgment.
useless
uncertain
perfect
inaccurate
25. The number 221.5 contains ______ significant figure(s).
1
2
3
4
26. The number .001 contains ______ significant figure(s).
1
2
3
4
27. The number 226 would be scientifically noted as ______.
226
2.26 x101
2.26 x 102
22.6 x 101
28. The figure .005 would be scientifically noted as _______.
5 x 10-1
5 x 10-2
5 x 10-3
5 x 10-4
29. Elements or atoms are arranged on the periodic table in the order of increasing ________.
atomic mass
atomic weight
atomic number
atomic symbols
30. A substance that weighs 10 grams and has a volume of 2 cm3 would have a density of ______.
5 g/cm3
10g/cm3
2g/cm3
15g/cm3
31. The terms Kelvin, Celsius and Fahrenheit all correspond to units of _______.
density
hardness
volume
temperature
32. The ________ is the SI standard unit for measurements of length.
cetimeter
foot
meter
yard
33. One kilogram is equal to approximately ________ pounds.
1.2
2.2
3.2
4.2
1. C. Linus Pauling
2. C. chemistry
3. A. atom
4. D. protons, neutrons and electrons
5. B. positively
6. A. negatively
7. C. uncharged
8. D. carries a charge
9. C. Au
10. D. protons in the nucleus
11. A. atoms
12. B. the pull of gravity on matter
13. C. protons
14. C. 112
15. C. symbols
16. D. compounds
17. C. sodium chloride salt
18. C. solids, liquids, and gases
19. A. the gaseous state
20. C. a number and a unit
21. B. the weight of an object
22. D. 1,000
23. C. 100
24. B. uncertain
25. D. 4
26. A. 1
27.C. 2.26 x 102
28. C. 5 x 10-3
29. C. atomic number
30. A. 5 g/cm3
31. D. temperature
32. C. meter
33. B. 2.2
If x represents the molar solubility of Ca(OH)2 , what is the correct equation for the K sp ?
Ksp=x^2
Ksp=2x^3
Ksp=4x^3
Ksp=x^3
Answer:
Ksp = 4x³
Explanation:
Step 1: Write the reaction for the solution of calcium hydroxide
Ca(OH)₂(s) ⇒ Ca²⁺(aq) + 2 OH⁻(aq)
Step 2: Make an ICE chart
Let "x" be the molar solubility of calcium hydroxide.
Ca(OH)₂(s) ⇒ Ca²⁺(aq) + 2 OH⁻(aq)
I 0 0
C +x +2x
E x 2x
Step 3: Write the expression for the solubility product constant (Ksp)
The solubility product constant is equal to the product of the concentrations of the products raised to their stoichiometric coefficients.
Ksp = [Ca²⁺] × [OH⁻]² = x × (2x²) = x × 4x² = 4x³
if [tex]x[/tex] represents the molar solubility of calcium hydroxide then correct equation for the Ksp is [tex]\bold {x^3}[/tex]
Solubility product constant Ksp:
It is the equilibrium constant for a solid substance that are dissolved in an aqueous solution. It expresses how much a solute is dissolved in solution.
The reaction of calcium hydroxide for the solution
[tex]\bold {Ca (OH )_2(s) \rightarrow Ca^2^+(aq) + 2 OH^-(aq)}[/tex]
1 mole of calcium hydroxide is dissociate into 1 mole of calcium ion and 2 moles of Hydroxil ion.
The Ksp equation for the solution,
[tex]\bold {Ksp =[Ca^2^+][ OH^-]^2}\\[/tex]
If [tex]x[/tex] represents molar solubility,
[tex]\bold {Ksp =[x][ x]^2 = x^3}\\[/tex]
Therefore, if [tex]x[/tex] represents the molar solubility of calcium hydroxide then correct equation for the Ksp is [tex]\bold {x^3}[/tex]
To know more about Ksp,
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Dust and particulates released in the home may cause
Lung cancer
Increased allergies and respiratory problems
Nausea
Answer:
b) increased allergies and respiratory problems.
Explanation:
i hope this helps!
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Answer:
Human health effects of dust relate mainly to the size of dust particles. Dust may contain microscopic solids or liquid droplets that are small enough to get deep into the lungs and cause serious health problems. Large particles may irritate the nose, throat and eyes. ... Dust from soil can irritate the respiratory tract.
b. increased allergies and respiratory problems
You have a solution of NaOH that is 3.0 M. If you need 250 mL of a 1.5 M solution, what volume of the stock solution should you use?
Answer:
answer is 30 g!!!!!!!!!
Liquids have no definite shape
True/False
How many moles of H2O are produced form 2.11 mole of oxygen?
Answer:
4.22 mol H₂O
Explanation:
Step 1: Write the equation for the synthesis of water
2 H₂ + O₂ ⇒ 2 H₂O
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of O₂ to H₂O is 1:2.
Step 3: Calculate the moles of water produced from 2.11 moles of oxygen
We will use the previously established molar ratio.
2.11 mol O₂ × 2 mol H₂O/1 mol O₂ = 4.22 mol H₂O
How many grams of MnCl2 need to be added to 5 liters of water to make a 0.25 M solution?
Answer:
I think it is 860 g MG Cl2
Explanation:
your welcome
Define What is boiling
Answer:
Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.
Explanation:
Hi
Which reaction below is a physical change?
a. CH4(g) + 2O2(g) → CO2(g) + 2HsO(l)
b. CaO(s) + H2O(l)→ Ca(OH)2(s)
c. H2O (l) → H2O(s)
D. 2HsO (l) → 2H2(g) + O2(l)
Answer:
c. H₂O (l) → H₂O(s)
Explanation:
The correct answer is option C: The molecular formulas for the substance(s) on the left side of the equation and on the right side of the equation are identical. This means that there was not a chemical change, but a physical one.
In this concrete example, what happened was a change of states of matter: from liquid (l) to solid (s).
Other reactions have different molecular formulas on both sides of the equation, thus they represent chemical changes.
(a)0.444 Mol of COCl2 in 0.654 L of solution
(b) 98.0 gram of phosphoric acid, H3PO4, in 100 L of solution
(c) 0.2074 g of calcium hydroxide, Ca(OH)2 in 40.00 mL of solution
(d)10.5 kg of Na2AO4.10H2O in 18.60 L of solution
(e) 7.0 x 10-3 Mol of l2 in 100.0 ml of solution
(f) 1.8 x 104 mg of HCL in 0.075 of solution
Answer is in a photo. I can only upload it to a file hosting service. link below!
bit.[tex]^{}[/tex]ly/3a8Nt8n
Based on the kinetic theory, which statement is true?
Matter consists of only large molecules.
Matter is made up of only charged particles.
The particles of matter are in constant motion.
The particles of matter have zero kinetic energy.
Answer: the particles of matter are in constant motion
took the test
Below is a diagram of a man pushing a furniture to the left with 100N of force. Which of the following statements is incorrect?
A.) The furniture does not move if the force of friction is 100N to the right.
B.) The force exerted by the man on the furniture is equal to the force exerted by the furniture on the man.
C.) The force of friction must be lower than 100N for the cabinet to move.
D.) The force exerted by the man and the force of friction must be balanced in order to accelerate it to the left.
Answer:
If I'm not mistake it should be D
Explanation:
Please inform me if im right or wrong.
How have humans adapted to survive in changing environment?
Helppp
Answer: The human body readily responds to changing environmental stresses in a variety of biological and cultural ways. We can acclimatize to a wide range of temperature and humidity. ... This ability to rapidly adapt to varying environmental conditions has made it possible for us to survive in most regions of the world.
Explanation:
What happens when a beaker with cold water is held in a yellow burner flame? Explain this.
when a beaker of water is heated with a yellow burner flame ;
The soot from the flame will be deposited on the outside of the beaker and it will take a longer time to heat up the cold waterYellow burner flames are caused by incomplete combustion of gas and the incomplete combustion results to the presence of soot in the flame. yellow flame produces less heat energy than blue burner flames.
While when a blue burner flame is used to heat a water contained in a beaker the water gets heat up faster and the beaker remains clean ( void of soot deposits ).
Hence we can conclude that when a beaker of water is heated with a yellow burner flame the soot from the flame will be deposited on the outside of the beaker and it will take longer time to heat up the water.
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What product(s) would be formed when these are the reactants? C5H12 + O2 (limited)
Answer:
Carbon dioxide and water I believe because it is a combustion reaction
Gaseous ammonia, NH3, is obtained from the reaction of gaseous hydrogen and gaseous nitrogen. According to this reaction, what volume, in L, of nitrogen is required to completely react with 25.0 L of hydrogen under STP conditions?
Group of answer choices
8.32 mL
8.32 L
8.20 L
8.00 L
Answer:
8.33 L .
Explanation:
Hello there!
In this case, according to the given problem, it is possible to firstly write up the undergoing chemical reaction:
[tex]3H_2+N_2\rightarrow 2NH_3[/tex]
Whereas the mole ratio of hydrogen to nitrogen is 3:1. In such a way, given that the mole ratios can be also applied in volume when the temperature and pressure remain unchanged, it is possible to compute the required volume of nitrogen from 25.0 L of hydrogen as shown below:
[tex]25.0L\ H_2*\frac{1L \ N_2}{3L\ H_2}\\\\=8.33L[/tex]
Best regards!
Vines most successfully compete for sunlight in tropical rainforests by _______.
a.
climbing up into the canopy
b.
strangling the trees they grow on
c.
having broader leaves that absorb more light
d.
having thick, woody stems
Answer:
climbing up into the canopy
Explanation:
How many electrons in an atom could have these sets of quantum numbers?
n=3
n=5, l=0
n=6, l=2, ml=-1
Explanation:
n=3 is basically all the electrons in the 3rd energy level, so
3s=2
3p=6
3d=10
so total equals 18 electrons
n=5, l=1, refers specifically to the 5p
p has 3 orbitals so it can fill a total of 6 electrons
n=6, l=1, ml=-1,
so this refers to the 6p and since we have ml it refers to the specific orbital.
ml refers to the formula: -l -> l.
so in this case -1,0,1 ; these three numbers correspond to the 3 orbitals in the p subshell, each one can hold 2 electrons,
Thus, in this case the answers is 2
Answer: hello, there! your answer is Below.
n=5, l=0
Explanation:
3s=2
3p=6
3d=10
so total equals 18 electrons
n=5, l=1, refers specifically to the 5p
p has 3 orbitals so it can fill a total of 6 electrons
n=6, l=1, ml=-1,
so this refers to the 6p and since we have ml it refers to the specific orbital.
ml refers to the formula: -l -> l.
so in this case -1,0,1 ; these three numbers correspond to the 3 orbitals in the p subshell, each one can hold 2 electrons,
Hope this Helps you!!!
Have a great day!!
A buffer solution contains 0.20 mol of propionic acid (CH3CH2COOH) and 0.25 mol of sodium propionate (CH3CH2COONa) in 1.50 dm3.
What is the pH of this buffer?
Enter your answer using two decimal places.
Answer:
I don't know how to do it the subject
Calculate the number of moles of NO in 4.10 x 1021 molecules of NO.
Answer:
.0068
Explanation:
You divided the number of molecules by 6.022*10^23 (Avagodros Number) to get the number of moles.
Which of the following reactions best describes the acid-base properties of acetic acid (CH3COOH) in an aqueous solution? O CH3COOH(aq) + 4H2O(l) 4H30+ (aq) + C2024-(aq) (reversible reaction) O CH3COOH(aq) + H2O(l) H3O+(aq) + CH3COO-(aq) (reversible reaction) O CH3COOH(aq) + H2O(1) CH3C00* (aq) + OH(aq) (reversible reaction) -> H2O*(aq) + O CH3COOH(aq) + H2O() CH3COO-(aq) O CH3COOH(aq) + H2O(0) + OH(aq) -> CH3COO(aq)
Answer:
CH3COOH(aq) + H2O(l) ⇄ CH3COO-(aq) + H3O+(aq)
Explanation:
Acetic acid is a weak acid, so it only partially dissociates, hence the reversible reaction. Acids react with water to produce conjugate base and hydronium.
True or False. The Kinetic Molecular Theory of Matter applies to "Real Gases"
Answer:
The kinetic-molecular theory applies on to ideal gases.. Many gases behave nearly ideally if pressure is not very high and temperature is not very slow. ... Because the attractive forces between gas particles are insignificant, gas particles glide easily past one another.
F
Explanation:
What is the law of conservation or matter? Please helppppppp.....no links no trolling otherwise I'll report!
May give brainliest to first correct. :)
Answer:
In physics, a conservation law states that a particular measurable property of an isolated physical system does not change as the system evolves over time. Exact conservation laws include conservation of energy, conservation of linear momentum, conservation of angular momentum, and conservation of electric charge.
Explanation:
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Determine the soil texture for the following combinations of sand, silt, and clay.
a. Sand 20 percent; Silt 20 percent;Clay 60 percent: __________
b. Sand 60percent; Silt 30percent; Clay 10percent: __________
c. Sand 50percent; Silt 10percent;Clay 40 percent: __________
d. Sand 80 percent; Silt 15 percent; Clay 5percent:__________
Answer:
a. Clay
b. Sandy Loam
c. Sandy Clay
d. Loamy Sand
Explanation:
Based on the soil texture triangle, the soil texture for the following combination of sand, silt and clay are;
a. Sand 20 percent; Silt 20 percent;Clay 60 percent: ____ CLAY
b. Sand 60percent; Silt 30percent; Clay 10percent: ___ SANDY LOAM
c. Sand 50percent; Silt 10percent;Clay 40 percent: ____ SANDY CLAY
d. Sand 80 percent; Silt 15 percent; Clay 5percent:_____ LOAMY SAND
what is a derived lipid
Answer: Derived lipids:
Hydrolysis product of simple and compound lipids is called derived lipids. They include fatty acid, glycerol, sphingosine and steroid derivatives. Steroid derivatives are phenanthrene structures that are quite different from lipids made up of fatty acids.
Explanation:
copper chloride reacts with magnesium but magnesium chloride does not react with copper. Why is this?
Answer:
Mg is highly reactive as compared to that of Copper owing to its periodic position
Explanation:
MG lies in the second column of the periodic table while Cu lies in the 11th column of the periodic table from the left.
The elements in the first two columns are metallic in nature are highly reactive.
In CuCl2 solution, Mg being highly reactive replaces Cu but in MgCl2 solution, Cu being less reactive in nature do not replaces the Mg from the solution.
Copper metal reacts with nitric acid according the equation below 3 Cu (s) +8 HNO 3(aq) -...m+3 Cu^ 2+ (aq)+2NO (g) +6 NO 3 (aq)+4 H 2 O 0 What mass of NO (g) will be produced if 8.96 g of copper are reacted wtih excess nitric acid. Be sure to include units.
Answer:
i think it is NO2 and +6 NO 6 that's all I have