Answer:
The scientific method attempts to minimize the influence of bias or prejudice in the experimenter. Even the best-intentioned scientists can't escape bias. ... That's the job of the scientific method. It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results.
Explanation:
The Scientific Method is simply a framework for the systematic exploration of patterns in our world. It just so happens that this framework is extremely useful for the examination of chemistry and its many questions.
Question 30 (10 points) All unauthorized experiments are prohibited . O True False
Answer:
All unauthorized experiments are prohibited. You are allowed to enter the chemical preparation/storage area any time you need to get an item. Laboratory aprons should be worn during all lab activities. It's okay to pick up broken with our bare hand as long as the glass is placed in the trash.
Explanation:
How many moles of argon, Ar, are in 1.63×1024 Ar atoms?
Answer:
Explanation:
Hello! To begin, remember Avogadro's number, 6.02*10^23 molecules!
You take your number of Ar atoms and divide it by Avogadro's number:
[tex]\frac{1.63 * 10^{24} Ar atoms}{6.02 * 10x^{23} }[/tex] = 2.7076412 moles...
round to 3 sig dig's (based on "1.63")
Final answer = 2.71 moles Ar
What technique(s) can be used to remove one solid from a mixture of solids and how?
Answer:
Explanation: Chromatography involves solvent separation on a solid medium. Distillation takes advantage of differences in boiling points. Evaporation removes a liquid from a solution to leave a solid material. Filtration separates solids of different sizes.
The technique(s) that can be used to remove one solid from a mixture of solids is chromatography.
What is chromatography?On a solid medium, chromatography uses solvent separation. Different boiling points are used in distillation.
A liquid is removed through evaporation from a solution to leave a solid behind. Different-sized particles are divided using filtration. Additionally, it can be employed as a purification method to separate a mixture's constituent parts for use in other operations or studies.
There are four main types of chromatography.
Liquid ChromatographyGas ChromatographyThin-Layer Chromatography Paper Chromatography.Therefore, Chromatography is one or more of the methods that can be used to separate a single solid from a mixture of solids.
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PLEASE HELP. Which element does not form a stable ion with the same electronic structure as argon?
A aluminium
B chlorine
C phosphorus
D potassium
the answer is A, but i chose D. i just need to know why is it wrong. thanks!
Explanation:
K+ ion has 18 electrons and Argon also has 18 electrons so they do have the same electronic structure.
However, Al3+ ion has 10 electrons and Argon has 18 electrons, so they do not have the same electronic structure.
There are three stable isotopes of magnesium. Their masses are 23.9850, 24.9858, and 25.9826 u. If the average atomic mass of magnesium is 24.3050 u and the natural abundance of the lightest isotope is 78.99%, what are the natural abundances of the other two isotopes?
Answer:
²⁵ Mg = 10.00%
²⁶ Mg = 11.0%
Explanation:
Given that:
Magnesium ²⁴Mg has an abundance of 78.99%
Hence, (100 - 78.99)% = 21.01%
21.01% is the abundance of ²⁵ Mg and ²⁶ Mg
Suppose,
²⁵ Mg = x
²⁶ Mg = (21.01 - x)%
Then;
avg. atomic mass = [tex]\dfrac{78.99}{100 }(23.9850)+\dfrac{x}{100}(24.9858) +\dfrac{21.01-x}{100}(25.9826)[/tex]
where the avg. atomic mass = 24.3050
∴
[tex]24.3050 \times 100 = {78.99}(23.9850)+\dfrac{x}{100}(24.9858) +\dfrac{21.01-x}{100}(25.9826)[/tex]
2430.5 = 2440.46915 -0.9968 x
0.9968x = 2440.46915 - 2430.5
0.9968x = 9.96915
x = 9.96915/0.9968
x = 10.00%
∴ Recall that:
²⁵ Mg = x
²⁶ Mg = (21.01 - x)%
²⁵ Mg = 10.00%
²⁶ Mg = (21.01 - 10.00)%
²⁶ Mg = 11.0%
The natural abundances of the other two isotopes, that is, Mg-25 and Mg-26 are 10% and 11.01%.
What is Natural abundance?It is the abundance of isotopes of a chemical element as naturally found on a planet.
Based on the given information:
The three stable isotopes of Mg are Mg-24, Mg-25 and Mg-26. The natural abundance of the lightest isotope, that is, Mg-24 is 78.99%. The masses of the isotopes are 23.9850 u, 24.9858 u and 25.9826 u. The average atomic mass of Mg is 24.3050 u.Now the natural abundance of all the isotopes of Mg is 100%.
Mg-24 + Mg-25 + Mg-26 = 100
Mg-25 + Mg-26 = 100-78.99
Mg-25 + Mg-26 = 21.01
Now let us assume that Mg-25 is x% then Mg-26 will be (21.01% -x).
Now,
Average atomic mass of Mg = [(Natural abundance of Mg-24) × (isotopic mass of Mg-24) + (Natural abundance of Mg-25) × (Isotopic mass of Mg-25) + (Natural abundance of Mg-26) × (Isotopic mass of Mg-26)]
Putting the values we get,
24.3050 amu = (78.99% × 23.9580 amu) + (x% × 24.9858 amu) + (21.01% - x%) × 25.9826 amu
24.3050 amu = 18.9458 + 24.9858 × x + 5.4589 - (25.9826x)
24.3050 = 24.4047 - (0.9968x)
0.9968x = 24.4047 - 24.3050
x = 0.1000
x = 10%
The natural abundance of Mg-25 is 10%.
The natural abundance of Mg-26 = 21.01% - x% = 21.01% - 10% = 11.01%.
Thus, the natural abundances of the other two isotopes are 10% and 11.01%.
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PLEASE HELP! The density of baby oil is 0.820 g/mL. What is the mass if the volume is 57.1 mL of baby oil.
Answer:
Density=mass / volume.
0.820=mass /57.1.
mass=0.820×57.1
=46.822g.
what are pollen grains? where are
are they formed?
Answer:
Only ask one question
Explanation:
A proton has a __________ charge.
a. positive
b negative
c neutral
elements, compounds and mixtures
Explanation:
10ml = Volume of water
14ml = Volume of water + Volume of marble
Therefore the volume of the marble is 4ml.
The volume of water is 10 ml and the total volume of the cylinder is 14 mi, then the volume of the marble is 4ml.
What is volume ?Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected.
The basic formula for volume is length, breadth, and height, as opposed to length, width, and height for the area of a rectangular shape. The calculation is unaffected by how you refer to the various dimensions; for instance, you can use "depth" instead of "height."
Volume is a unit used to describe how much space a substance takes up. A physical material with mass and space-occupying properties is referred to as matter. The usual measurement of volume in physical sciences like chemistry is in cubic meters (m3).
The volume of water is 10 ml
Volume of water + Volume of marble
=14 ml
Thus, the volume of the marble is 4ml.
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546000000 in scientific notation
Answer:
5.46x[tex]10^{8}[/tex]
Explanation:
just move the decimal however many places to the left until there is only one digit to the left of it and then square the ten by that number
write the chemical symbols for three different atomic cations with 20 protons
Answer:
The 3 elements that has 3 electrons are:
Li, Be+ and B2+
Explanation:
Hoped that helped :)
How is using a bow and arrow mechanical and potential energy?
Answer:A bow and arrow possesses mechanical energy. When the arrow is drawn it has potential energy and when it is released it produces a force to propel the arrow towards the aimed target, therefore giving the arrow kinetic energy. When you combine both energies it creates mechanical energy.
Explanation:
Answer:
Building up potential energy when pulling it back
Explanation:
Label each carbon atom with the appropriate geometry. Bin 1 points to a carbon bonded to a double bonded carbon and single bonded to two hydrogens. Bin 2 points to a carbon double bonded to a carbon and single bonded to a carbon and one hydrogen. Bin 3 is a carbon single bonded to two carbons and single bonded to two hydrogens. Bin 4 is the same as bin 3. Bin 5 is a carbon triple bonded to a carbon and single bonded to a carbon. Bin 6 is triple bonded to a carbon and single bonded to a hydrogen.
Answer:
Bin 1 points to a carbon bonded to a double bonded carbon and single bonded to two hydrogens. --- trigonal planar, tetrahedral
Bin 2 points to a carbon double bonded to a carbon and single bonded to a carbon and one hydrogen.------- trigonal planar, tetrahedral
Bin 3 is a carbon single bonded to two carbons and single bonded to two hydrogens. ----- tetrahedral, tetrahedral
Bin 4 is the same as bin 3.--------tetrahedral, tetrahedral
Bin 5 is a carbon triple bonded to a carbon and single bonded to a carbon.---- linear, tetrahedral
Bin 6 is triple bonded to a carbon and single bonded to a hydrogen.---linear, tetrahedral
Explanation:
A single C-C or C-H bond is in a tetrahedral geometry, the carbon atom is bonded to four species with a bond angle of 109°.
A C=C bond is trigonal planar with a bond angle of 120°.
Lastly, a C≡C bond has a linear geometry with a bond angle of 180° between the atoms of the bond.
True or False: when steam condenses into a liquid, heat is given off to the environment.
Answer:
true.
Explanation:
Which is denser? Object A = 0.1191047619047619 Object B = 0.1875
Answer:
B- 0.1875 is denser.
hope this helps
Select all that apply. Atoms are made up of _____. protons neutrons compounds elements electrons
Answer:
protons, nuetrons, electrons
Explanation:
compounds and electrons are made up of atoms.
Answer:
protons, nuetrons, electrons
Explanation:
A student is trying to determine the identity of some pieces of an unknown
substance by finding their density. He finds the mass of a weighing boat to
be 2.69 g and the mass of the unknown pieces, including the weighing
boat, to be 18.01 g. To find the volume of the pieces, he measured out 25.7
mL of water in a graduated cylinder and then added the pieces to find a
new volume of 32.3 ml. What is the identity of the substance?
Density
2.16
Mineral
Halite
2.32
Gypsum
Quartz
2.65
2.72
Calcite
3.18
Fluorite
O halite
O quartz
O
O gypsum
fluorite
juju
Answer : The identity of the substance is gypsum.
Explanation : Given,
Mass of weighing boat = 2.69 g
Mass of unknown pieces including weighing boat = 18.01 g
Initial volume = 25.7 mL
Final volume = 32.3 mL
First we have to calculate the mass of unknown pieces.
Mass of unknown pieces = Mass of unknown pieces including weighing boat - Mass of weighing boat
Mass of unknown pieces = 18.01 g - 2.69 g
Mass of unknown pieces = 15.32 g
Now we have to calculate the volume of unknown pieces.
Volume of unknown pieces = Final volume - Initial volume
Volume of unknown pieces = 32.3 mL - 25.7 mL
Volume of unknown pieces = 6.6 mL
Now we have to calculate the density of unknown pieces.
[tex]\text{Density of unknown pieces}=\frac{\text{Mass of unknown pieces}}{\text{Volume of unknown pieces}}[/tex]
Now putting all the given values in this formula, we get:
[tex]\text{Density of unknown pieces}=\frac{15.32g}{6.6mL}[/tex]
[tex]\text{Density of unknown pieces}=2.32g/mL[/tex]
From the given table we conclude that the unknown piece is gypsum whose density is 2.32 g/mL.
Therefore, the identity of the substance is gypsum.
The material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.
Density can be defined as the mass of the substance per unit volume.
To calculate the density of the unknown piece, the mass has been calculated as:
Mass of unknown piece = Mass of weighing boat with the unknown piece - Mass of weighing boat
Mass of unknown piece = 18.01 g - 2.69 g
Mass of unknown piece = 15.32 grams.
The volume of the unknown piece can be calculated as:
The volume of unknown piece = Final volume - Initial volume
The volume of the unknown piece = 32.3 mL - 25.7 mL
The volume of the unknown piece = 6.6 mL.
The density can be expressed as:
Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]
The density of the unknown piece = [tex]\rm \dfrac{15.32\;g}{6.6\;ml}[/tex]
The density of the unknown piece = 2.32 g/mL.
From the given set of pieces, the material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.
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Choose the correct description of elements from the options below. Select the correct answer below:
A) They can only be monoatomic.
B) They can only be diatomic.
C) They are mixtures.
D) They contain only one type of atom.
Answer:
ill say a
Explanation:
it make the most cense
They can only be monoatomic.
Are all elements monatomic?Nearly all elements form monatomic gases at extremely high temperatures or when exposed to enough radiation because there's too much kinetic energy for bonds to form or the energy breaks chemical bonds between atoms.
Are elements diatomic?There are seven diatomic elements given below
hydrogen, nitrogen, oxygen, fluorine, chlorine, iodine, bromine.Learn more about elements here https://brainly.com/question/18096867
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What are the three major subatomic particles?
Answer:
the answer will be protons neutrons and electrons:)
Explanation:
On a rollercoaster ride, when do the cars have the most kinetic energy?
A serving of potato chips contains 2400 mg of sodium. How many significant figures are in the number? Question 3 options: 4 3 2 1
Answer:
2
Explanation:
The last zeros don't count because there is no decimal. So only 2,4 are left over. Counting them gives us 2 digits. So 2.
Which of the following describes the characters of a solid A. Particles are packed closely together in an organized way and maintain their size shape and volume. B. Particles are relatively close together, filling the container from the bottom up, and have a definite volume. C. Particles are changed and spread out from each other, taking the shape and volume of the container. D. Particles are spread out from each other, taking the shape and volume of the container
The answer to your question is:
Answer:
A. Particles are parked closely together in an organized way and maintain their size, shape and volume.
Explanation:
These are some characteristics of a solid;
A solid has a fixed volume.Particles are closely parked and in an organized way. Solids maintain their shape and size [not like liquids and gases that take the shape of their container]. Hope it helps!!Please mark me as the brainliest!!!✨Thanks!!!!❤✨
5. The density of a substance is 3.4 x 10^3 g/mL. Mixing it with another substance increases the density by 1.5 X 10^1 times. What is the density of the mixture? 6. A compound contains atoms of sulfur and iron. There are 3.6 X 10^20 atoms of iron in the compound. Divide the nu of iron atoms by 1.8 X 10^- 4 to find the number of sulfur atoms in the compound?
Answer:
5. the total density of the mixture = 3.415 x 10^3 g/mL
6. the number of sulfur atoms in the compound = 2 x 10^24
Explanation:
5.
given:
density of a substance is 3.4 x 10^3 g/mL
Mixing it with another substance increases the density by 1.5 x 10^1 times.
find:
What is the density of the mixture?
-------------------------------------------------
let density (a) = 3.4 x 10^3 g/mL
density(b) = 1.5 x 10^1 g/mL
since there is no specific density provided for the mixture, we then add both to increase the density,
total density = density(a) + density(b)
total density = 3.4 x 10^3 g/mL + 1.5 x 10^1 g/mL
total density = 3.415 x 10^3 g/mL
therefore,
the total density of the mixture = 3.415 x 10^3 g/mL
===============================================
6.
given:
A compound contains atoms of sulfur and iron.
There are 3.6 X 10^20 atoms of iron in the compound.
find:
Divide the no of iron atoms by 1.8 X 10^- 4 to find the number of sulfur atoms in the compound?
-------------------------------------------------
iron = 3.6 x 10^20 ⇒ to divide 1.8 X 10^- 4
sulfur atoms = 3.6 x 10^20 = 2 x 10^24
1.8 X 10^- 4
therefore,
the number of sulfur atoms in the compound = 2 x 10^24
===================================================
Answer:
5. the total density of the mixture = 3.415 x 10^3 g/mL
6. the number of sulfur atoms in the compound = 2 x 10^24
Explanation:
i got them correct on exam
What does conserving mass mean in a chemical equation?
Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Explanation:
hope that helps
A balloon is filled with 2.00 L of helium gas at sea level, 1.00 atm and 12.0ºC. The balloon is released and it rises to an altitude of 30,000 ft. If the pressure at this altitude is 0.300 atm and the temperature is -55.0ºC, what is the volume of the balloon?
Answer:
THE VOLUME OF THE BALLOON IS 1.45 L
Explanation:
At sea level:
Volume = 2 L
Pressure = 1 atm
Temperature = 12 °C
At 30000 ft altitude:
Pressure = 0.30 atm
Temperature = -55°C
Volume = unknown
Using the general gas formula:
P1 V1 / T1 = P2 V2 / T2
Re-arranging the formula by making V2 the subject of the equation, we have;
V2 = P1 V1 T2 / T1 P2
V2 = 1 * 2 * 12 / 0.30 * 55
V2 = 24 / 16.5
V2 = 1.45 L
The volume of the balloon at the temperature of -55 C and 0.30 atm is 1.45 L
You have $7.25 in your pocket in quarters. How many quarters do you
have? (Given, 1$= 4 Quarters)
Answer:
29
Explanation:
$1=4 quarters
$7 = 28 quarters ( multiply 7 times 4)
.25 = 1 quarter
add 28 and 1
Answer:29
A gas has an initial volume of 50.0 liters, a temperature of 65 Kelvin, and a pressure of 805
Torr. If the pressure is increased to 1244 Torr, and the temperatures to 92.2 Kelvin, what would
the new volume be for this gas?
Answer:
its 459 L
Explanation:
Iodine has a density of 4.94 g/mL. What is its density in lb/gal? (1 gal= 3.785 L and 1 lb = 454 g)
Answer:
Try using this formula so useful.
Explanation:
Particles = atoms/molecules etc.
A= is your given
B= is what you want
Taylor saw a raccoon in her backyard last weekend. She put
out some food and a bowl with 360 milliliters (ml) of water in
it. The raccoon ate all the food and drank 1/3 of the water.
How much water did the raccoon drink?
Answer:
The raccoon drank 120 ml of water.
Explanation:
All you have to do is take the 360 ml of water and to find what 1/3 of it is you divide 360 by 3 to get 120 ml of water.
Hope that helps and have a great day!
Linh is analyzing a solution in a crime lab. He needs to determine what liquid was used to dissolve the other substances. Which method would best complete the task?
evaporation
filtration
decantation
distillation
Answer:
D is the answer
Explanation:
distillation
Answer:
distillation
Explanation: