Answer:
0.9537g is the original mass of Zn in the mixture
Explanation:
We can solve this question using the molar mass of each compound involved:
Mg = 24.305g/mol
MgO = 40.304g/mol
Zn = 65.38g/mol
ZnO = 81.38g/mol
Mg-Zn:
1.0875g = 24.305X + 65.38Y (1)
Where X are moles of Mg and Y moles of Zn
MgO-ZnO:
1.4090g = 40.304X + 81.38Y (2)
(1.4090g - 81.38Y) / 40.304 = X
0.03496 - 2.0192Y = X
Replacing (2) in (1)
1.0875g = 24.305(0.03496 - 2.0192Y) + 65.38Y
1.0875 = 0.8497 - 49.077Y + 65.38Y
0.2378 = 16.303Y
0.01459 moles of Zn = Y
And the mass is:
0.01459 moles of Zn * (65.38g/mol) =
0.9537g is the original mass of Zn in the mixtureWhat is the empirical formula for a compound that is 83.7 % carbon and 16.3 % hydrogen?
Explanation:
First, you need to be sure the elemental analysis has identified all the components.
83.7+16.3=100% so we’re good, and the same ratio works for the formula,
The formula is CxHy, so x*12+y*1= 100% of the empirical formula wt, which we’ll use later to confirm the elemental analysis. We need x and y
Then x = 83.7/12 is 6.975 and being savvy, we guess it’s supposed to be 7, since empirical formulas use whole numbers if they can. Likewise y=16.3/1 = 16.3, and now we round down to the nearest whole number (16), making our empirical formula C7H16
Check:
7*12+16*1=100 (the empirical formula wt) 84/100=0.84 and 16/100=0.16 This is close enough, so C7H16 is the empirical formula.
How are hail and snow different? (Check the picture for answer options)
Answer:
A, Hail is large spheres of ice and snow is small flakes of ice.
HELP PLEASE
Sometimes people mistakenly state that velocity and speed are the same thing. People might make such a mistake because they forget that velocity describes both speed and _______.
•volume
•force
•the time interval
•direction
Answer:
force
Explanation:
On the Kelvin temperature scale, which value approximately represents the freezing point of water?
Bolling
point of
water
1104
27215-
100
100.00
200
290
Reezing
point
of water
273.15-
0.00
Absolute
zero
273.15
Kelvin Scale
Celsius Scale
O A. 32
B. 100
0273
OD 0
Answer: freezing point of water 273.15K, boiling point of water 373.15 K
Explanation:
The Kelvin scale starts at the lowest possible temperature, absolute zero. This is 0 Kelvins (K)= -273.15 deg C. Hence water freezes at 0 deg C = 273.15 K and boils at 100 deg C = 373.15 K
A person travels 10 miles in 5 minutes. What is that person’s speed?
Answer:
I think it might be 2 miles per hour
HELP WILL GIVE BRAINLIEST!
You are in the kitchen making your favorite recipe when you realize you’ve made a huge mistake instead of sugar, you just put a cup of salt into the oil. That will taste horrible! You are out of oil do you can’t throw it away and start again. What will you do?
Use what you know about physical properties and common separation techniques to remove the salt from the oil. Explain each step you’ll take abs the basic science behind it.
Answer:
cover the taste with sugar add two times the amount your supposed to put in
Explanation:
A container is at a pressure of 3 atm and a temperature of 280K. What is the new temperature when the pressure is reduced to 1.5 atm.
Answer:
140 K
Explanation:
Step 1: Given data
Initial pressure of the gas (P₁): 3 atmInitial temperature of the gas (T₁): 280 KFinal pressure of the gas (P₂): 1.5 atmFinal temperature of the gas (T₂): ?Step 2: Calculate the final temperature of the gas
We have a gas whose pressure is reduced. If we assume an ideal behavior, we can calculate the final temperature of the gas using Gay-Lussac's law.
T₁/P₁ = T₂/P₂
T₂ = T₁ × P₂/P₁
T₂ = 280 K × 1.5 atm/3 atm = 140 K
Which flasks contain organisms undergoing cellular respiration? A. Flask 1, 2, and
3 B. Flask 1 and 3 C. Flask 2 and 3 D. None
Flask 1, 2, and 3 will basically perform cellular respiration. The correct option is A.
What is cellular respiration?A sequence of chemical processes known as cellular respiration convert glucose into ATP, which can then be used as energy for a variety of bodily functions.
Glycolysis, the citric acid cycle, and oxidative phosphorylation are the three basic processes that take place during cellular respiration.
During photosynthesis, it is the conversion of ADP to ATP utilizing solar energy. In the mitochondria of a cell, the process of cellular respiration also results in the formation of ATP.
This can be done through either anaerobic or aerobic respiration, depending on whether oxygen is present.
Cellular respiration can be done in plant as well as animal cells. So, in flask 1, 2, and 3, it will take place.
Thus, the correct option is A.
For more details regarding cellular respiration, visit:
https://brainly.com/question/29760658
#SPJ2
Your question seems incomplete, the missing image is:
Ethanol is a common laboratory solvent and has a density of 0.789 g/mL. What is the mass, in pounds, of 49.0 gal of ethanol
Answer: The mass of the ethanol is 322.6 pounds
Explanation:
Density is defined as the mass contained per unit volume.
[tex]Density=\frac{mass}{Volume}[/tex]
Given : Mass of ethanol = ?
Density of ethanol= [tex]0.789g/ml[/tex]
Volume of ethanol = 49.0 gal = 185485 ml ( 1gal=3785ml)
Putting in the values we get:
[tex]0.789g/cm^3=\frac{xg}{185485ml}[/tex]
[tex]x=146347g=322.6pound[/tex] (1g=0.00220462pound)
Thus the mass of the ethanol is 322.6 pounds
How are protons and neutrons similar? How are they different?
Answer:
They are both in the nucleus of an atom, they have different charges
Explanation:
Protons and neutrons are similar because they are both in the nucleus of the atom, being orbited by the electron(s). They are different, however, because they have different charges, the proton is positively charged and the neutron is neutral.
hope this helped:)
g what happens to rate of decomposition when a catlyst is added to hydrogen peroxide solution (H2O2) Does rate increase or decrease
Answer:
Increases
Explanation:
When a catalyst is added to hydrogen peroxide,the rate of decomposition Increases.
In living organisms, hydrogen peroxide is gotten through metabolism and it has to be broken down. This is because it could become toxic if it gets to be concentrated.
We can increase the rate of decomposition reaction through the addition of a catalyst. This breaks it down into hydrogen and water
How do rivers affect watersheds?
Rivers affect the size of a watershed.
Rivers get their water only from watersheds.
Watersheds are drained by rivers.
Watersheds are created by rivers.
Answer:
Explanation:
the last one I read it
Answer:
d
Explanation:
student mixes vinegar and baking soda inside a sealed plastic bag would the reaction be the same if baking soda and vinegar were mixed outside the plastic bag?
Sudhi is studying the motion of a toy car. She places the car in the middle of the ramp and releases it.
which best describes the reference point in this scenario?
A: the top of the ramp
B: the bottom of the ramp
C: the ending position of the car
D: the starting position of the car
The reference point in this scenario is the starting position of the toy car.
What is reference point?A reference point is can be defined as the frame of reference or point mark from the various of measurement of the car's motion is determined.
When an object starts its motion from zero origin, its reference is point will be the zero origin.
Generally, the reference point of an object in motion is usually the starting position of the object.
Thus, the reference point in this scenario is the starting position of the toy car.
Learn more about reference point here: https://brainly.com/question/2037494
#SPJ2
An iron bar of mass 841 g cools from 84°C to 7°C. Calculate the heat released (in kilojoules) by the metal.
Answer:
28.75211 kj
Explanation:
Given data:
Mass of iron bar = 841 g
Initial temperature = 84°C
Final temperature = 7°C
Heat released = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
specific heat capacity of iron is 0.444 j/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 7°C - 84°C
ΔT = -77°C
By putting values,
Q = 841 g × 0.444 j/g.°C × -77°C
Q = 28752.11 j
In Kj:
28752.11 j × 1 kJ / 1000 J
28.75211 kj
How many hydrogen atoms in the
molecule (NH4)2C8H402?
Answer:
12 hydrogen atoms
Explanation:
Let's consider the chemical formula of the compound (NH₄)₂C₈H₄O₂.
We can see the ammonium ion, NH₄⁺, which contains 4 hydrogen atoms. However, this ion is enclosed in parenthesis with a subindex 2. That means that we have to multiply the whole ion by 2, therefore resulting in 8 atoms of hydrogen. Then, in C₈H₄O₂, we can see another 4 hydrogen atoms. The total number of hydrogen atoms in 1 molecule of (NH₄)₂C₈H₄O₂ is 8 + 4 = 12 hydrogen atoms.
can anybody help me with this ?
how many particles are there in 5.0 moles
Answer:
3.01 × 10^24 particles
Explanation:
According to Avagadro, in one mole of a substance, there are 6.02 × 10^23 atoms or particles.
Using the formula: N = n × NA
Where;
N= number of particles or atoms
n = number of moles
NA = Avagadro's constant or number
This means that for 5 moles of a substance, there will be:
5 × 6.02 × 10^23
= 30.1 × 10^23
= 3.01 × 10^24 particles
A stock solution of Al(CH3COO)3 is available to prepare solutions that are more dilute. Calculate the volume, in mL, of a 2.0-M solution of Al(CH3COO)3 required to prepare exactly 250 mL of a 0.230-M solution of Al(CH3COO)3.
Answer:
[tex]28.75\ \text{mL}[/tex]
Explanation:
[tex]C_1[/tex] = Initial concentration = 2 M
[tex]C_2[/tex] = Final concentration = 0.23 M
[tex]V_1[/tex] = Initial volume
[tex]V_2[/tex] = Final volume = 250 mL
We have the relation
[tex]C_1V_1=C_2V_2\\\Rightarrow V_1=\dfrac{C_2V_2}{C_1}\\\Rightarrow V_1=\dfrac{0.23\times 250}{2}\\\Rightarrow V_1=28.75\ \text{mL}[/tex]
So, the required volume is [tex]28.75\ \text{mL}[/tex].
When the vapor pressure of water is 0.106 mmHg, determine the reaction quotient for that above equilibrium.
Answer:
Answer is explained in the explanation section below.
Explanation:
Note: This question is not complete and lacks necessary data to solve. However, I have found a similar question and I will be using its data to solve this question for the sake of understanding and concept.
Solution:
Equilibrium Reaction:
CaO(s) + H2O(g) -->Ca(OH)2(s)
We need to find the reaction quotient for this question:
Q = [tex]\frac{1}{P_{H20} }[/tex]
Here, only the pressure of the gaseous reactant will be used and here H20 is the only reactant which is gaseous.
And we are given that, vapor pressure of water is = 0.106 mmHg
So,
Now, we need to convert it into atm
so, 1atm = 760 mmHg
0.106 mmHg = 0.106/760 atm
0.106 mmHg = 1.394 x [tex]10^{-4}[/tex] atm
Plugging in the values in the equation, we get:
Q = [tex]\frac{1}{P_{H20} }[/tex]
Q = [tex]\frac{1}{1.394 . 10^{-4} }[/tex]
Q = 7173.60 [tex]atm^{-1}[/tex]
When a particle is moving fast it has a lot of kinetic energy in it. ?
Answer:
Random particle motion in liquids and gases is a difficult concept for in temperature, the particles move faster as they gain kinetic energy.
Explanation:
Why must the red blood cells and the solution in the beaker be isotonic?
Isotonic solutions restore fluid volume because they fill the tissues and maintain fluid volume more effectively than hypertonic or hypotonic solutions.
What is a cell?Cells are the basic unit of life.
If a cell is placed in an isotonic solution, there will be no net flow of water into or out of the cell, and the cell's volume will remain stable.
If the solute concentration outside the cell is the same as inside the cell, and the solutes cannot cross the membrane, then that solution is isotonic to the cell.
Learn more about the Isotonic here:
https://brainly.com/question/15111297
#SPJ1
The density of aluminium is 2.70 g/cm3. Find the mass in grams of a bar of aluminum measuring 2.03 cm by 3.0056 cm by 13.4 cm.
Answer:
221g is the mass of the bar of aluminum
Explanation:
The volume of a bar of aluminum is obtained as:
Length*Width*height = Volume
That means the volume of the bar is:
2.03cm * 3.0056cm * 13.4cm = 81.8cm³
Now, the density of 2.70g/cm³ means the aluminum weighs 2.70g per cm³. The mass of 81.8cm³ is:
81.8cm³ * (2.70g / 1cm³) =
221g is the mass of the bar of aluminumWhich of the following food changes represent a physical change
A. Toasting bread
B.cooking beans
C. Mixing kool-aid
D. Frying an egg
A ______________________ is the distance from one compression to the next compression in a longitudinal wave.
A) frequency
B) amplification
C) rarefaction
D) wavelength
Answer: D
Explanation:
A wavelength is the distance from one compression to the next compression in a longitudinal wave. so, option D is correct.
What is wavelength ?A spectrum is the term used to describe the range of wavelengths or frequencies for wave phenomena. The term was originally used to describe the electromagnetic spectrum, but it is now used to describe the sound spectrum and vibration spectrum.
When electromagnetic radiation such as radio waves, light waves, or infrared waves travel across space, they leave behind distinctive patterns. Each wave has a distinct size and form. Wavelength is the separation between peaks.
In general, the electromagnetic spectrum is split into seven sections, rising in energy and frequency and decreasing in wavelength. Common names for these types of radiation include radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays, and gamma rays.
Thus, option D is correct.
To learn more about wavelength, follow the link;
https://brainly.com/question/12924624
#SPJ5
how long did the mixture boil
Explain why Statutes coated with white lead on long exposure to atmosphere
turn black and the original colour can be restored on treatment
with H2O2.
Answer:
Its because once you go black, there's no going back
Explanation:
What was the purpose of incubating your ubiquity plates upside down?
A.to prevent contaminating
B.to prevent condensation from forming on the agar surface
C. incubating plates upside down is an aseptic technique
D.to prevent organisms from over-growth
the regular sequence of growth and division that cells undergo is called the?
Answer:
Cell cycle.
Explanation:
A cell can be defined as the fundamental or basic functional, structural and smallest unit of life for all living organisms. Some living organisms are unicellular while others are multicellular in nature.
A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells.
Generally, cells have the ability to independently replicate themselves. These cells can be compared to the kind of structures found in a business or factory, where you have different workers performing different functions.
In a cell, the "workers" that perform various functions or tasks for the survival of the living organism are referred to as organelles and they include nucleus, cytoplasm, cell membrane, golgi apparatus, mitochondria, lysosomes, ribosomes, chromosomes, endoplasmic reticulum, vesicles, etc.
The regular sequence of growth and division that cells undergo is called the cell cycle. This cycle makes it possible for the cells found in living organisms to divide and produce new cells.
Basically, there are four (4) phases of the cell cycle and these are;
I. Prophase.
II. Metaphase.
III. Anaphase.
IV. Telophase.
When the absolute value of the difference in electronegativity of two adjacent atom in a compound is 1, they are most likely bonded by ________.
Answer:polar covalent bond
Explanation:
Compounds are formed ether by donating, receiving or sharing of electrons making the bonds between them to be ionic, or covalent .
Now according to the rule of type of bond assignment due to electronegativity difference of atoms
---When the electronegativity difference is less than 0.5, the bond formed is nonpolar covalent.
---When the electronegativity difference is between 0.5 and 1.6, the bond is considered polar covalent
---When the electronegativity difference greater than 2.0, then the bond is ionic.
Therefore, When the absolute value of the difference in electronegativity of two adjacent atom in a compound is 1, they are most likely bonded by polar covalent bond eg HCl bond , CCL4 bond
