calculate the molarity of a solution made by dissolving 3.7 moles of sodium chloride in 8.7 liters of water?
Answer:
Molarity = 0.425 M
Explanation:
Given data:
Number of moles = 3.7 mol
Volume of solution = 8.7 L
Molarity of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Molarity = 3.7 mol/8.7 L
Molarity = 0.425 M
16. The diffusion rate of an unknown gas is measured to be 31.50 mL/min. Under
identical conditions, the diffusion rate of oxygen gas is measured to be 30.50
mL/min. Hint: diffusion rate is directly related to velocity.
Determine the identity of the unknown gas from the following options:
a. CH4
b. CO
C. NO
d. CO2
e. NO2
Answer:
Explanation:
[tex]\frac{r_1}{r_2} = \sqrt{\frac{M_2}{M_1} }[/tex]
r₁ and r₂ are rate of diffusion of gas having molecular mass of M₁ and M₂
[tex]\frac{31.5}{30.5} = \sqrt{\frac{32}{M_1} }[/tex]
1.0666 = 32 / M₁
M₁ = 30
molecular weight of NO = 14 + 16 = 30
So the unknown gas is NO .
1) The speed constant was determined for the first order decomposition of an organic compound at various temperatures:
Calculate the activation energy for the reaction. Build a graph of Arhenius
2) The hydrolysis of sucrose. in which a sucrose molecule is broken in a glucose molecule and a fructose molecule, is part of the digestive process. Calculate the speed constant for the hydrolysis of sucrose at 35,0 C knowing that k=1,0x10^-3 L mol^-1s^-1 at 37 C and that the activation energy is 108kj mol^-1
Answer:
1) Eₐ = 100.3 kJ/mol
2) k = 7.62×10⁻⁴ M⁻¹s⁻¹
Explanation:
1) Make an Arrhenius graph by plotting ln(k) on the y-axis and 1/T on the x-axis (don't forget to convert temperature to Kelvin).
The slope of the line is equal to -Eₐ/R.
-Eₐ/R = -12065
Eₐ = 100,300 J/mol
Eₐ = 100.3 kJ/mol
2) Since we know the slope of ln(k) vs 1/T is -Eₐ/R, we can say:
-Eₐ/R = (ln(k₂) − ln(k₁)) / (1/T₂ − 1/T₁)
Plug in values and solve for k:
-(108,000 J/mol) / (8.314 J/mol/K) = [ln(k) − ln(1.0×10⁻³)] / [1/(35+273.15 K) − 1/(37+273.15 K)]
-12990 = [ln(k) + 6.91] / (2.09×10⁻⁵ K⁻¹)
-0.272 = ln(k) + 6.91
ln(k) = -7.18
k = 7.62×10⁻⁴ M⁻¹s⁻¹
Convert 3564 to Scientific Notation:
*
Answer:
3564 = 3.564 x 10^3
Explanation:
i.e expresing the value in standard form.
Answer the following questions in the space provided.
1. Classify each of the following as a homogeneous or heterogeneous substance.
a. iron ore
b. quartz
c. granite
d. energy drink
e. oil-and-vinegar salad dressing
f. salt
g. rainwater
h. nitrogen
2. Classify each of the following as a physical or chemical change.
a. ice melting
b. paper burning
c. metal rusting
d. gas pressure increasing
e. liquid evaporating
f. food digesting
3. Compare a physical change with a chemical change.
Answer: iron ore is heter
quartz homo
granite heter
energy drink homo
oil-and vingar salad dressing heter
salt homo
rainwater homo
nitrogen homo
ice melting chemical
burning paper chemical change
answer this question
Answer:
The first one
Explanation:
Convert 2.6 x 106 mL to L.
Answer:
0.2756 L
Explanation:
0.2756 L
I would like some help on this please.
Answer:
Both b and c i think so... .
I think it is the dark blue tile because if it is not soluble, or insoluble, then it will not dissolve and you will still see it floating around in the liquid or at the bottom of the container.
When iron reacts with oxygen, it forms iron oxide, or rust.
4 Fe + 3 O2 2 Fe2O3
If 112 g of iron (Fe) combines with 24 g of oxygen (O2), how much iron oxide is formed?
Answer:
Mass of iron oxide: 79.85 g
Explanation:
Given data:
Mass of iron = 112 g
Mass of O₂ = 24 g
Mass of iron oxide formed = ?
Solution:
4Fe + 3O₂ → 2Fe₂O₃
Number of moles of Fe:
Number of moles = mass/ molar mass
Number of moles = 112 g/ 55.85 g/mol
Number of moles = 2 mol
Number of moles of O₂:
Number of moles = mass/ molar mass
Number of moles = 24 g/ 32 g/mol
Number of moles = 0.75 mol
Now we will compare the moles of oxygen and iron with iron oxide.
Fe : Fe₂O₃
4 : 2
2 : 2/4×2 = 1
O₂ : Fe₂O₃
3 : 2
0.75 : 2/3×0.75 = 0.5
The number of moles of iron oxide formed by oxygen are less thus it will be limiting reactant.
Mass of iron oxide:
Mass = number of moles × molar mass
Mass = 0.5 mol × 159.69 g/mol
Mass = 79.85 g
Answer:
136 g Fe2O3
Explanation:
study island
Why is it important o differentiate between human and animal blood from a crime scene? A) To determine whether an animal might have been injured. B) In order to accurately identify the source of any blood. In order to thoroughly and accurately recreate the crime scene. D To determine the possible source of any trace evidence such as hair or bite marks
Answer:
B) In order to accurately identify the source of any blood. In order to thoroughly and accurately recreate the crime scene.
100 POINTS HELP!!!!!!!!!!!!!!!!!!!!
Given that,
Mass number of Ge = 70
Then,
Atomic number of Ge = 32
No. of protons = 32
No. of electrons = 32
No. of neutrons,
→ 70 - 32 = 30
Answer:
30 is correct
Explanation:
70 - 32 = 30 mark as brainliest
How do elements tend to structure the molecules of life?
Answer:
The six most common elements in living things are carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. Atoms of these elements combine and form thousands of large molecules. These large molecules make up the structures of cells and carry out many processes essential to life.
Explanation:
hope that helped
Different elements combine together to form an organism and other essential organic and inorganic molecules for the life and survival of organisms.
In multicellular organisms, such as animals, atoms form molecules by coming together. These atoms are present in the elements. Molecules can interact to form cells. Cells combine to form tissues, which make up organs.
At the most basic level, all organisms are made of a combination of elements:
carbon is the most common and essential element for the lifeCarbon has the ability to form a wide range of compounds.With other elements most commonly, hydrogen, the oxygen they form various molecules such as carbohydrates, lipids, and many more.With other molecules like phosphate, sulfur, and nitrogen they make essential macromolecules and nutrients like protein, vitamin, and nucleic acid essential for life.Thus, Different elements combine together to form an organism and other essential organic and inorganic molecules for the life and survival of organisms.
Learn more about elements:
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How much MmHg are in 30.0 psi
Answer:
1551.45 MmHg
hope this helps :D
Kinetic and potential energy are two types of energy that relate too
Answer:
Option B. A tractor–trailer traveling at 80 kph.
Explanation:
Kinetic energy can be defined as the energy possessed by a body in motion. Mathematically, it is expressed as:
K.E = ½mv²
Where:
K.E is the kinetic energy.
m is the mass of the object.
v is the velocity of the object.
From the equation, K.E = ½mv²,
We can say that the kinetic energy (K.E), is directly proportional to both the mass (m) and square of the velocity (v). This implies that the greater the mass of an object, the greater the kinetic energy and the smaller the mass, the smaller the kinetic energy.
Now, considering the options given in question above, it is evident that the tractor–trailer has a greater mass than the car, cheetah and motor cycle. Hence, the tractor–trailer will have a greater kinetic energy even though they are traveling with the same velocity.
Pleaseee helpppp this is thermal energy in 6th rade and i need it quick for a formal assesment!!!!!!
Answer:The answer is B my child
Explanation:
If Tracy were to put the pizza on the countertop to cool down, which temperature do you predict the pizza would get to?
a. -1 degrees Celsius
b. 10 degree Celsius
c. 27 degree Celsius
d. 93 degree Celsius
e. 260 degree Celsius
Answer:
d. 93 degree Celsius
Explanation:
Plzzzzzzzzzzzzzzzzzzzzzzz mark AS BRAINLIST
What is conduction?
Transfer of heat through circular movement
Transfer of heat through direct physical contact
Transfer of heat through electromagnetic waves
Transfer of heat through the movement of part
Answer:
Transfer of heat through direct physical contact
Explanation:
The meaning of conduction is the transfer of heat directly transmitted through a substance when there is the difference between temperature and electrical potential. Hope it helps!
Answer:
B
Explanation:
When does a single-displacement reaction occur?
A. When a substance, usually containing carbon, reacts with oxygen
to produce energy in the form of heat and light
B. When one element replaces another element in a compound
during a chemical reaction
C. When a substance is broken down into two or more simpler
substances in a chemical reaction
D. When a single element forms two double elements
Answer:
B. When one element replaces another element in a compound during a chemical reaction
__is a term that refers to the amount of space that a substance or an object takes up
Refer to the Chemical Compounds table above. How many total elements are in
Ethanol?
Answer:
3 element i.e carbon (C), hydrogen (H) and oxygen.
Explanation:
The following data were obtained from the question:
Subtance >>>>>>>> Chemical Formula
Glucose >>>>>>>>> C₆H₁₂O₆
Methane >>>>>>>> CH₄
Ethanol >>>>>>>>> C₂H₅OH
Hydrogen peroxide >> H₂O₂
From the above table, we can see that ethanol (C₂H₅OH) contains carbon (C), hydrogen (H) and oxygen
Therefore, the total number of elements present in ethanol, C₂H₅OH is 3.
HELPPP
Which of the following pairs of elements is most likely to permanently transfer one or more electrons to the
other element?
a. Chlorine and phosphorus
b. Iron and bromine
c. Tin and lead
d. Nitrogen and oxygen
how many moles of methane are there in a 10g sample?
1 grams Methane is equal to 0.062334579609362 mole. Note that rounding errors may occur, so always check the results.
I need help with these 2 problems ASAP please.
This is not chemistry but i could not find science
(THIS QUESTION IS FOR SCIENCE)
Answer:
1. is sickle-cell anemia and 2. is phenyketonuria
Explanation:
What are the four main types of tissues in the human body?
epithelial
dermal
vascular
connective
muscle
nervous
Question 20 of 66
Which of the following species has the same number of protons as Fe3+?
A) Mn3+
B) Co2+
C) Fe2+
D) Nit
E) CO3+
Fe²⁺ has the same number of protons as Fe³⁺.
In order to know the number of protons of a species, we need to look for the atomic number (Z) in the Periodic Table.
The atomic number of Fe is 26, so it has 26 protons. Since protons are in the nucleus, they are not lost nor gained. Fe³⁺ results from Fe losing 3 electrons, but it has 26 protons as well.
Taking this into account, let's consider the number of protons of the following species:
A) Mn³⁺. It has 25 protons like Mn (Z = 25).
B) Co²⁺. It has 27 protons like Co (Z = 27).
C) Fe²⁺. It has 26 protons like Fe (Z = 26).
D) Ni. It has 28 protons (Z = 28).
E) Co³⁺. It has 27 protons like Co (Z = 27).
Fe²⁺ has the same number of protons as Fe³⁺.
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The combination of two or more atoms, from the same or different elements, creates a(n).
a. element
c. molecule
b. atom
d. mixture
Please select the best answer from the choices provided
Pls help!!!! Fast!!!
B
С
D
Answer:
c Molecule
Explanation:
cuz science
A person drops two objects from the same height. one object weighs 15 N and the other weighs 10 N
A The 10 N object has the same mass as the 15 N object
B The 15 N object has twice the mass of the 10 N object
C The 15 N object has more mass than the 10 N object
D The 10 N object has more mass than the 10 N object
What is another name for radioactive dating?
Answer:
radioisotope dating is another name
Answer:
Radiometric dating
Explanation:
hope that helps
In chemistry lab, a student measured the density of liquid ethanol is 0.789 g/mL. Represent its density in units of 1b /in3? (2.54 cm = 1 in., 2.205 lb = 1 kg)
A. 9.09 x 10+ 1b / in
B.4.42 x 10-1b / in?
OC.2.85 x 10-2 16 / in
D. 0.106 16 / in?
O E.5.86 x 10" 16/in3
Answer:
Option C is correct option = 2.85×10⁻² lb/in³
Explanation:
Given data:
Density in g/mL = 0.789
Density in lb/in³ = ?
Solution:
It is given that,
2.54 cm = 1 in
2.205 lb = 1 kg thus,
1 mL = 1 cm³
0.789 g/cm³ × 1 kg/ 1000 g × 2.205 lb/1 kg × (2.54 cm / 1in)³
2.85×10⁻² lb/in³
The density of liquid ethanol is 0.789 g/mL, which is equivalent to 0.0285 lb/in³.
A student measured the density of liquid ethanol to be 0.789 g/mL and we want to convert it to lb/in³. We will need a series of conversion factors.
What is a conversion factor?A conversion factor is an arithmetical multiplier for converting a quantity expressed in one set of units into an equivalent expressed in another.
Step 1: Convert 0.789 g/mL to lb/mLWe will use the following conversion factors:
1 kg = 1000 g.1 kg = 2.205 lb.0.789 g/mL × (1 kg/1000 g) × (2.205 lb/1 kg) = 1.74 × 10⁻³ lb/mL
Step 2: Convert 1.74 × 10⁻³ lb/mL to lb/in³We will use the following conversion factors:
1 mL = 1 cm³.1 in = 2.54 cm.1.74 × 10⁻³ lb/mL × (1 mL/1 cm³) × (2.54 cm/1 in)³ = 0.0285 lb/in³
The density of liquid ethanol is 0.789 g/mL, which is equivalent to 0.0285 lb/in³.
Learn more about unit conversion here: https://brainly.com/question/13016491
What is the process that occurs when repeated freezing and thawing breaks apart rocks?
Erosion
Deposition
Physical weathering
Chemical weathering
Answer:
C. Physical weathering.
Answer: C. Physical weathering.
Explanation: