A solution is prepared by dissolving 15.0 g of table salt in 70.0g of water. Find(a) the mass percent of solute and (b) the mass percent of solvent.
Answer:
[(15g NaCl/(70+15)]*100 = % NaCl
{(70g H2O/(70+15)]*100 = % H2O
Explanation:
A solution is prepared by dissolving 15.0 g of table salt in 70.0g of water. (a) The mass percent of solute is 17.64 % and (b) The mass percent of solvent is 82.35 %.
How to calculate the Mass percent of solute ?Mass percentage = [tex]\frac{\text{Mass of solute}}{\text{Mass of solute + Mass of solvent}}[/tex] × 100
How to calculate the Mass percent of solvent ?Mass percentage = [tex]\frac{\text{Mass of solvent}}{\text{Mass of solute + Mass of solvent}}[/tex] × 100
Here,
Mass of solute (table salt) = 15.0 g
Mass of solvent (water) = 70.0 g
(a) The mass percent of solute
Put the value in above formula we get
Mass percentage = [tex]\frac{\text{Mass of solute}}{\text{Mass of solute + Mass of solvent}}[/tex] × 100
= [tex]\frac{15}{15 + 70}[/tex] × 100
= [tex]\frac{15}{85}[/tex] × 100
= 17.64 %
(b) The mass percent of solvent
Mass percentage = [tex]\frac{\text{Mass of solvent}}{\text{Mass of solute + Mass of solvent}}[/tex] × 100
= [tex]\frac{70}{15 + 70} \times 100[/tex]
= [tex]\frac{70}{85} \times 100[/tex]
= 82.35 %
Thus, we can say that (a) The mass percent of solute is 17.64 % and (b) The mass percent of solvent is 82.35 %.
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What does the law of conservation of matter state?
a Matter can be created, destroyed, and changed.
b Matter can be destroyed and created, but not changed.
c Matter can be changed, but not created or destroyed.
d Matter can be created and changed, but not destroyed.
The answer is c. Matter can be changed, but not created or destroyed.
An aqueous solution has a volume of 2.0 L and contains 36.0g of glucose. If the Molar Mass of glucose is 180g/mol, what is the molarity of the solution
Convert grams of Glucose to moles of Glucose and then solve for Molarity
show all work.
Answer:
moles = 36/180 = 0.2 moles
molarity = 0.2/2 = 0.1 mol/dm3
What type of chemical reaction is Al + FeO --> Al2O3 + Fe
Answer:
single reaction equation
Explanation:
Type of Chemical Reaction: For this reaction we have a single replacement reaction. Balancing Strategies: In this single replacement (also called displacement) reaction the Al and Fe are switching places.
Identify the correct chemical name.
Select one:
a. calcium (II) hydroxide
b. chromium hydroxide
c. ammonium calcide
d. ammonium chloride
2KClO3 —> 2KCl2+ 3O2
true if balanced or false if not
reaction type 1: synthesis, 2: decomposition, 3: single replacement, 4: double replacement, 5: combustion
Answer:
False. The balanced equation should be
2KClO3-->2KCl + 3O2
it is a decomposition reaction.
Does this aid in joining the two molecules?
Answer:
yes it does aid in joining the two molecules
Explanation:
what type of elements form ionic bonds with metals
Answer:
between metal and nonmetal ions
Explanation:
How did you use the tools in the sim that helped you decide if the atom had a positive, negative, or 0 charge?
Answer:
The atomic number on the Periodic Table will tell you how many protons are in the nucleus of each atom.
Explanation:
number of electrons and protons should be equal in a neutral atom. Because each electron has a -1 charge, and each proton a +1 charge, the number of each must be the same for the net charge to equal zero.
Is this a male cat or female?
Explanation:
Lift the kitten's tail. The opening just under the tail is the anus. Below the anus is the genital opening which is round in males and is a vertical slit in females. In kittens of similar size, the distance between the anus and the genital opening is greater in the male than the female.
TW: use of inapropate words*
Answer:
not enough information to tell
Explanation:
One way you can tell this difference is the distance between the cat's genitals (organs seen on the outside of the body) and the anus. A male will have a much greater distance between the genitals and anus than females, 1/2 inch apart on a male kitten and over 1 inch apart on a male adult cat. However, if the two are almost adjacent on a kitten or less than 1/2 inch apart on an adult, it’s a female.
Pls help I will give u points pls
Answer:
i think D
Explanation:
The modern-day quantum model of the atom is better than John Dalton’s model because it
A. has set electron orbits.
B. has positive and negative particles in the nucleus.
C. can be represented in one dimension.
D. answers many questions about atoms.
Answer:
its D. answers many questions about atoms.
The modern-day quantum model of the atom is better than John Dalton’s model because it " answers many questions about atoms."
What is quantum model ?This concept also referred to as the quantum mechanical and wave mechanical model, would be the cornerstone of contemporary atomic theory. The fact that an electron inside an atom may only exist in a limited range of states or energy is analogous to a standing wave.
What is John Dalton’s model ?Dalton proposed that the concept of atoms will be used to explain the laws of conservation of mass as well as definite proportions. Imagining atoms as "solid, massy, hard, impenetrable, moving objects," he claimed that almost all matter would be composed of these tiny, indivisible particles.
Dalton also stated that almost no atom might be formed, converted into another, as well as destroyed. The complex shapes of orbitals also known as electron clouds used in the quantum mechanical atomic model are areas of space where an electron is likely to be present. So rather than being based on certainty, this model would be probability based.
Therefore, the correct answer will be option (D)
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Someone please help with number 9.
Answer:
Its development and progression are usually linked to a series of changes in the activity of cell cycle regulators. For example, inhibitors of the cell cycle keep cells from dividing when conditions aren't right, so too little activity of these inhibitors can promote cancer.
Superficially, the connection between the cell cycle and cancer is obvious: cell cycle machinery controls cell proliferation, and cancer is a disease of inappropriate cell proliferation. Fundamentally, all cancers permit the existence of too many cells.
Explanation:
hope it helps
Consider the reaction below. Upper C upper C l subscript 5 (g) double-headed arrow upper P upper C l subscript 3 (g) plus upper C l subscript 2 (g). At 500 K, the reaction is at equilibrium with the following concentrations. [PCI5]= 0. 0095 M [PCI3] = 0. 020 [CI2] = 0. 020 M What is the equilibrium constant for the given reaction? 0. 042 0. 42 2. 4 24.
The equilibrium constant of the reaction is 0.042.
The reaction equation is given as;
PCl5(g) ⇄ PCl3(g) + Cl2 (g)
Recall that this equation shows the decomposition of phosphorus pentachloride.
We have the following equilibrium concentrations;
[PCI5]= 0.0095 M
[PCI3] = 0.020
[CI2] = 0.020 M
The equilibrium constant, K is obtained from;
K = [PCI3] [CI2]/[PCI5]
K = [0.020]^2/[0.0095]
K = 0.042
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4. How are isotopes of the same element different? Select all that apply.
[]They have different masses.
[]They have different numbers of electrons.
[]They have different numbers of neutrons.
[]They have different numbers of protons.
[tex]\huge \bf༆ Answer ༄[/tex]
The Correct choice is ~ A
Isotopes are the elements with same Atomic Number but different masses ~
an atom of chlorine has an amount number of 17 and a mass number of 37. how many protons neutrons, and electrons are in the atom?
Answer: There are 20 protons neutrons in the atom
five (5) muscular injuries and disease
Answer:
tendinitis.
carpal tunnel syndrome.
osteoarthritis.
rheumatoid arthritis (RA)
fibromyalgia.
bone fractures.
Ethanol (C2H5OH) reacts with oxygen gas in a combustion reaction. How many liters of carbon dioxide gas are produced at STP when 375 mL of a 75.0% ethanol solution by mass with a density of 1.22 g/mL reacts with excess oxygen?
The volume of carbon dioxide produced when 375 mL of a 75.0% ethanol solution by mass with a density of 1.22 g/mL reacts with excess oxygen is 667.52 L.
We are told in the question that the solution contains 75.0% ethanol solution by mass.
Hence;
Density of solution = mass/volume
mass = Density × volume = 1.22 g/mL × 375 mL = 457.5 g
Mass% = mass of solute/ mass of solution × 100
Mass of solute = x
Mass of solution = 457.5 g
Mass percent = 75.0%
Substituting values;
75 = x/457.5 + x × 100
75/100 = x/457.5 + x
0.75(457.5 + x) = x
343.125 + 0.75x = x
343.125 = x - 0.75x
x = 343.125/0.25
x = 1372.5 g
The equation of the reaction is;
C2H6O(l) + 3O2(g) → 2CO2(g) + 3H2O(l)
Number of moles of ethanol = 1372.5 g/46 g/mol = 29.8 moles
From the reaction equation;
2 moles of ethanol produces 2 moles of carbon dioxide
29.8 moles of ethanol also produces 29.8 moles of carbon dioxide
If 1 mole of carbon dioxide occupies 22.4 L
29.8 moles of carbon dioxide occupies 29.8 moles × 22.4 L/ 1 mole
= 667.52 L
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What makes solids, liquids, and gases different. Explain the hypothesis, prediction and experiments that can lead to scientific theory.
Answer: Gases, Liquids, and Solids
Gases
Explanation:
Behavior
gas liquid solid
assumes the shape and volume of its container
particles can move past one another assumes the shape of the part of the container which it occupies
particles can move/slide past one another retains a fixed volume and shape
rigid - particles locked into place
compressible
lots of free space between particles not easily compressible
little free space between particles not easily compressible
little free space between particles
flows easily
particles can move past one another flows easily
particles can move/slide past one another does not flow easily
rigid - particles cannot move/slide past one another
a hypothesis is a prediction based on a theory. If the Hypothesis comes true the theory is more accepted.
A scientific theory differs from a scientific fact or scientific law in that a theory explains "why" or "how": a fact is a simple, basic observation, whereas a law is a statement (often a mathematical equation) about a relationship between facts.
Which statement best describes mechanical energy?
the energy of electricity and motion
the energy of heat and magnetism
the energy of electricity and heat
the energy of moving parts and motion
Answer:
The energy of moving parts and motion
Explanation:
Mechanical energy doesn't have change in temperature or heat, so electricity and heat would be cancelled out. Mechanical energy is more about motion.
i need help with this asap..
1. What has shininess
2.ability to change its shape
I think it's metal if its abt science
Answer:
i think metal or glass not sure but i think its metal
Explanation:
explain the electrolysis of MgCl2 in aqueous solution
During electrolysis, a current is passed through the molten MgCl2, and when this happens, the Mg2+ ions move to the negative electrode where they PICK UP OR GAIN ELECTRONS. This is reduction. The Cl- ions move to the positive electrode where they LOSE ELECTRONS. This is oxidation.
How quickly the electron are moving through the circuit
A.Resistance
B.voltage
C.current
2.The strength with which electrons are pushed through the circuit?
A.Resistance
B.voltage
Current
Answer:
B
Explanation:
because the electrons are moving fast
The DEA has designated five chemicals often found in spice as _____ controlled substances, making it illegal to sell, buy, or possess these chemicals.
Answer:
I'm pretty sure this doesn't really connect with chemistry much but the answer should be Schedule 1 as stated by the Drug enforcement agency.
wsphorus-SL 3. In the isotope B-11, what does the 11 represent?
Answer:
Here boron-11 means the name of the element is boron and the mass number is 11
Explanation:
What is x?
a
28
b
44
c
224
d
136
Answer:
Hope answer is right, d=136
Pls fast pls due today pls pls I don’t wanna fail
Answer:
2:true
3: true
4:false
5: true
Explanation:
Do the ingredients changing into a cake in the oven a chemical reaction?
Answer:
When you bake a cake, the ingredients go through a chemical change. A chemical change occurs when the molecules that compose two or more substances are rearranged to form a new substance! When you start baking, you have a mixture of ingredients. The flour, egg, sugar,
Explanation:
Don’t understand this science Question.
Answer:
I got you..you need help but with which question?
Explanation:
Have a great day!
Why is acetic acid called weak acid?
Answer:
because...it is not strong enough proton donor to be entirely converted to hydronium ions in aqueous solution...
Explanation:
lemme know whether that was helpful!
