In the laboratory you dissolve 19.4 g of sodium chloride in a volumetric flask
and add water to a total volume of 375 mL.
What is the molarity of the solution? In M. What is the concentration of the sodium cation? In M. What is the concentration of the chloride anion? In M.
Answer: 0.885 M
Explanation: 19.4 grams of NaCl is (19.4g/58.55 g/mole) = 0.332 moles of NaCl. 375ml is 0.375 liters. Molar is moles per liter: (0.332 moles NaCl/0.375 liters) = 0.885 M
Pioneer 10 is a 267.1-kilogram robotic space probe that completed the first interplanetary mission
to Jupiter, and became the first spacecraft to achieve escape velocity from our solar system. How
much does it weight in pounds (lbs)?
Answer: 588.9 lbs
Explanation: 1 lb = 0.454 kg
(267.1kg)*(1 lb/0.454 kg) = 588.9 lbs
What are the variables used in an experiment? How are they different?
Answer:
There are many items that could be altered to test the reaction of another. These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
Explanation:
Salicyllic acid has what ionic charge?
Answer:
0
Explanation:
It has no charge.
Salicylic acid is insoluble in water because it is a non-polar covalent compound.
For this reason it is a poor conductor of electricity as it has no free moving ions that would act as charge carriers.
But on the other hand salicylate which is a conjugate base of salicylic acid has a charge of -1 and can be written as C7H5O3-.
hopefully this makes sense
:)
Can someone plz help me answer this question
Answer:
10 ml
Explanation:
The graduated cylinder contains 19 ml of water before the silver pellet is placed inside. Afterwards, the graduated cylinder measures 29 ml of water. Therefore the pellet displaced 10 ml of water. ( 29ml - 19ml = 10ml )
How many names make up binomial nomenclature?
A(3)
B(4)
C(1)
D(2)
which
each these
A tame the
belong
a cha Cooth
group of Compounds to
acid
can boxylic
B) Catty
*
C2H4
Answer:
please I don't understand the question, rewrite it
What does the half-life of a radioactive substance indicate?
A. It indicates how dangerous the substance is to humans.
B. It indicates how much energy is released over time.
C. It indicates how long it takes for the material to decay.
D. It indicates how long it takes until all radioactivity is gone
Answer:
it indicates how long it takes for the material to decay
Explanation:
hope this helps!
The half-life of a radioactive substance indicates how long it takes for the material to decay.
What is half-life of a radioactive?A half life is the amount of time it takes for half of a radioactive substance to decay.
Radioactive isotopes are defined as the isotopes which undergo decay processes very easily. They have very short half life. They are usually the isotopes of heavier elements.
Half life is defined as the time taken for the unstable isotope to fall to half its original value.
Hence, option C is correct.
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give the name and symbol of your favorite element and explain why it your favorite element.
Answer:
The most important elements that we use in everyday life include carbon, hydrogen, oxygen, with smaller amounts of things like chlorine, sulfur, calcium, iron, phosphorus,nitrogen, sodium, and potassium. Apart from these, other elements include magnesium, zinc, neon, and helium are also in our daily existence.
all these element are my favourite element .......
If a recycling center collects 3245 aluminum cans and there are 22 aluminum cans in 1 lb what volume in liters
The volume in liters of 3245 aluminum cans is 24.8 L.
A recycling center collects 3245 aluminum cans and there are 22 aluminum cans in 1 lb. The mass of 3245 aluminum cans is:
[tex]3245 cans \times \frac{1lb}{22cans} = 147.5 lb[/tex]
To convert mass to volume, we need the density of aluminum (5.95 lb/L). The volume corresponding to 147.5 lb of aluminum is:
[tex]147.5 lb \times \frac{1L}{5.95 lb} = 24.8 L[/tex]
The volume in liters of 3245 aluminum cans is 24.8 L.
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Determine the number of meters in 1.00 miles
Answer:
There are 1609.344 meters in a mile
Explanation:
If a container is strong enough to hold 62.0 pounds (lb) of gasoline, how many gallons can you put in there? The density of your gasoline is 0.720 g/cm3 .
1qt = 0.94635L
1gal = 4.0000qt
1 cm3 = 1mL (exact relationship, unlimited sig dig)
1lb = 453.59g
Answer = _____ gal (Put number only)
Taking into account the definition of density and change of units, if a container is strong enough to hold 62.0 pounds (lb) of gasoline, you can put 10.3184 gallons in there.
First you must know that density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is the relationship between the weight (mass) of a substance and the volume it occupies (that same substance). Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
On the other side, the rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.
To solve a direct rule of three, the following formula must be followed, where a, b and c are known values and x is the value to be calculated:
a ⇒ b
c ⇒ x
So, [tex]x=\frac{cxb}{a}[/tex]
The direct rule of three is the rule applied in this case where there is a change of units. To perform conversion of units from pounds to grams, you must first know that 1 lb = 453.59 g. So, if 453.59 g is 1 lb, how many grams equals 62 lb?
[tex]mass= \frac{62 lbx453.59 g}{1 lb}[/tex]
Solving:
mass= 28122.58 grams
Then, you know:
density= 0.720 [tex]\frac{g}{cm^{3} }[/tex]mass= 28122.58 gvolume= ?Replacing in the definition of density:
[tex]0.720\frac{g}{cm^{3} }=\frac{28122.58 g}{volume}[/tex]
Solving:
volume×0.720 [tex]\frac{g}{cm^{3} }[/tex]= 28122.58 g
[tex]volume=\frac{28122.58 g}{0.720\frac{g}{cm^{3} }}[/tex]
volume= 39059.14 cm³= 39059.14 mL= 39.05914 L (being 1 cm³= 1 mL= 0.001 L)
Now, to perform conversion of units from L to qt, you must first know that 1 qt = 0.94635 L. So, if 1 qt is 0.94635 L, how many qt equals 39.05914 L?
[tex]volume= \frac{39.05914 Lx1 qt}{0.94635 L}[/tex]
Solving:
volume= 41.2735 qt
Finally, to perform conversion of units from qt to gal, you must first know that 1 gal = 4.0000 qt. So, if 1 gal is 4 qt, how many gal equals 41.2735 qt?
[tex]volume= \frac{41.2735 qtx1 gal}{4 qt}[/tex]
Solving:
volume= 10.3184 gal
In summary, if a container is strong enough to hold 62.0 pounds (lb) of gasoline, you can put 10.3184 gallons in there.
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Which area of science is considered the central science?
chemistry
biology
physics
environmental science
Answer:
A. Chemistry.
Explanation:
Calculate the mass of 1 molecule of water
with step
Molecular Mass of water:-
[tex]\\ \sf\longmapsto H_2O[/tex]
[tex]\\ \sf\longmapsto 2(1u)+16u[/tex]
[tex]\\ \sf\longmapsto 2u+16u[/tex]
[tex]\\ \sf\longmapsto 18u[/tex]
[tex]\\ \sf\longmapsto 18g[/tex]
1mole of water weighs 18g
We know
[tex]\\ \sf\longmapsto 1mol=6.023\times 10^23molecules[/tex]
Mass of one molecule:-
[tex]\\ \sf\longmapsto \dfrac{18}{6.023\times 10^23}[/tex]
[tex]\\ \sf\longmapsto 2.98\times 10^24g[/tex]
Did they scientist believe in God
Answer:
some of them not believe in God
If the density of carbon tetrachloride is 0.893 g/mL, and a sample has a volume of 9.29 mL, what is the mass?
Answer:
8.3g
Explanation:
d=m/v
m=d*v
m=0.893*9.29
m=8.3g
If the density of carbon tetrachloride is 0.893 g/mL. The mass of the compound will be 8.3 g.
What is mass?Mass is the quantity of matter. The mass can be calculated by multiplying density with the volume. The evaluation of how close something is packed. As the mass per unit volume, it has that definition.
Volume is the space occupied by the object. The liquid that weighs heavier is denser if you weigh two liquids with similar volumes or amounts. A substance that is less dense than water will float if it is gently introduced to the water's surface.
So the formula will be d = m / v
m = d x v
The density of carbon tetrachloride is 0.893 g/m
The volume of carbon tetrachloride is 9.29 mL
What the mass is?
Putting the value in the formula
m = 0.893 x 9.29 = 8.3g
Thus, the mass of the compound will be 8.3 g.
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The sun is 93 million miles from the earth approximately how many years would it take to travel from earth to the sun if a person flew in a spaceship at 55 miles an hour?
(Hint:begin by dividing the distance by the speed to determine the number of hours it would take. Round your answers the the nearest whole number.)
Answer:
it would take 2 years
Explanation:
93/55=1.69--->1.70------>2
Which statement best describes the light that will cause emission of electrons from a given metal through the photoelectric effect?
light with a low enough intensity
light with a high enough frequency
light with a high enough intensity
light with a low enough frequency
Answer:
b
Explanation:
edge 2021
The best describes the light that will cause emission of electrons from a given metal through the photoelectric effect is " light with a high enough frequency. "
What is photoelectric effect?When electromagnetic radiation, like light, strikes a substance, the photoelectric effect would be the generation of electrons.
What is electrons?The smallest atom-forming particle is an electron, which has negatively charged.
The photoelectric effect would be a phenomenon where electrically charged particles were released from or contained within a substance as electromagnetic radiation will be absorbed. The effect is often referred to as the emission of electrons from such a metal plate when light strikes it.
Therefore, the correct answer will be option (B).
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name the types of polymerization and the differences
(d) Calculate the relative molecular mass of ammonium sulphate (NH4)2SO4.5H2O
[A, O= 16.0; H= 1.0; C= 12.0; N= 14.0; S= 32.1]
Answer:
222.1
Explanation:
(14+4*1)*2+32.1+16*4+(2*1+16)*5=222.1
Carry out the following conversions. Report your answers to the correct number of significant
figures.
(a) 75 cm to ft
ft
(b) 0.668 kg to lb
Ib
(e) 0.549 uL to qt
* 10-qt
(d) 9,991 mm to km
9.991 x 10 (select)
km
(e) 313 nm to mm
3.13 x 10 (select)
mm
(1) 7 ft to cm
* 102 cm
We want to perform some changes of units, such that the number of significant figures (the ones different than zero) does not change.
a) 75 cm to ft
We know that:
1ft = 30.48cm
1 = (1ft)/(30.48cm)
Now, remember that if we multiply a quantity by one we do not affect the quantity, so we can write:
75cm = 75cm*(1ft)/(30.48cm) = 2.5 ft
b) 0.668 kg to lb
we know that:
1kg = 2.20462 lb
then:
1 = (2.20462 lb)/(1kg)
0.668 kg = 0.668 kg*(2.20462 lb)/(1kg) = 1.47 lb
c) 0.549 uL to qt
We know that:
1 uL = 3.437*10^-9 qt
1 = (3.437*10^-9 qt)/(1 uL)
Then:
0.549 uL = 0.549 uL*(3.437*10^-9 qt)/(1 uL) = 1.91*10^-9 qt
d) 9.991 mm to km
we know that:
1mm = 1*10^-6 km
then:
1 = (1*10^-6 km)/(1mm)
So we can rewrite:
9.991 mm = 9.991 mm*(1*10^-6 km)/(1mm) = 9.991*10^-6 km
e) 313 nm to mm
We have:
1nm = 1*10^-6 mm
1 = ( 1*10^-6 mm)/(1 nm)
Then:
313 nm*( 1*10^-6 mm)/(1 nm) = 3.13*10^-4 mm
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How many atoms? H_____, O_____, Fe_____ Total atoms? _____ 3Fe(oh)2
Answer:
H = 6
O = 6
Fe = 3
Total atoms = 15
Explanation:
3Fe (OH)2
Fe = 1×3
O= 2× 3 = 6
H= 2× 3 = 6
Total atoms = 6+6+3=15
I hope I helped you^_^
What is best illustrated by wattson and crick's ball-and-stick model of DNA
How many molecules are present in 2 H₂ SO4
Answer:
1 mol of H2SO4 contains 6.022 x 10^23 molecules. : 0.5 mol of H2SO4 contains 0.5 x 6.022 x 10^23 molecules. = 3.011 x 10^23 molecules . that is 49 g of H2SO4 contains 3.011 x 10^23 molecules of H2SO
Explanation:
is AU is homoatomic or heteroatomic?
Answer:
AU is homoatomic
Explanation:
Homo-atomic Molecule: Molecules provided by unique one variety of particles are associated as Homo-atomic molecules
Ex: H2, N2, P4 etc.
Hetero-atomic Molecule: Particles constituted by several kinds of atoms are identified as Hetero-atomic molecules
Ex: CO2, NO2, CH4, HCl etc
As AU is homoatomic because this element is formed by only one atom
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Which of these can be mined from earth and used as an energy source?
A.Get rid of the waste and extra fluid
B.Ureters
C.Coal
D.Bladder
coal
Which of these can be mined from earth and used as an energy source?
A.Get rid of the waste and extra fluid
B.Ureters
C.Coal
D.Bladder
ans is coal
Metric Conversion: Which units are equivalent (the same) as 75g? (Pick 3)
(1 Point)
7500 mg
750 dg
7.5 dag
.075 Kg
The unit that is equivalent to 75g is 0.075 kg, 750 dg, and 7.5 dag. The correct options are b, c, and d.
What are measuring units?Measuring units are the units used to denote the measurement quantities. There are seven basic measuring units. They are length, Time, Amount of substance, Electric current, Temperature, Luminous intensity, and Mass.
The current unit is given grams, which are used to measure the mass of any object.
1000 grams is equal to 1 kilogram and 1 dg = 0.1 g, and 1 dag = 10 g. So by this formula, each of the quantities can be calculated.
1 kg = 1000 g
So, 0.075 kg = (0.075 × 1000)g = 75 g
1 dg = 0.1 g
So, 750 dg = (750 × 0.1) g = 75 g
1 dag = 10 g
So, 7.5 dag = (7.5 × 10) g = 75 g
Thus, the correct options are b. 750 dg, c. 7.5 dag, and d. .075 Kg.
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a wooden baseball bat is an example of
a: compound
b: element
c: heterogeneous
d: homogeneous
A wooden baseball bat is an example of a heterogeneous substance.
A heterogeneous substance is consists of compounds that are not thoroughly mixed together.
Woods are fibrous structural substances with spaces present in trees and other woody plants' stems as well as roots. They are composed of a natural composite of cellulose fibers and are contained with a lignin matrix that is capable of resisting compression.
They can use for fire, building, the manufacture of weapons and tools, furniture, as well as paperwork.
Wood is a heterogeneous, highly porous cellular material. It is made up of cells and the cell walls are made up of roughly 40% cellulose, 15% hemicellulose, and lignin of about (15–30%).
Therefore, we can conclude that a wooden baseball bat is an example of a heterogeneous substance.
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Determine the number of protons, neutrons, and electrons in the following isotopes
that are used in medical diagnoses:
a. atomic number 9, mass number 18, charge of 1-
b. atomic number 43, mass number 99, charge of 7+
C. atomic number 53, atomic mass number 131, charge of 1-
d. atomic number 81, atomic mass number 201, charge of 1+
e. Name the elements in parts (a), (b), (c), and (d).
Answer: In table below.
Explanation:
A.N. (atomic number) = protons
Mass (Total AMU)
Charge
P= Protons, same as atomic number
N = Neutrons, Atomic Mass Number - Protons
E = Electrons. (Atomic Number - Charge)
Element = Defined by atomic number
a) Atomic number=9 Protons = 9, neutrons = 9, electrons = 10
b) Atomic number=43, Protons = 43, neutrons = 56, electrons = 36
c) Atomic number=53, Protons = 53, neutrons = 78, electrons = 52
d) Atomic number=81, Protons = 81, neutrons = 120, electrons = 80
e) Name the elements in parts (a), (b), (c), and (d) are F, Tc, I and Tl.
What is the atomic number?Atomic Number (Z)= number of protons = number of electrons
Mass number (A) = number of protons + number of neutrons.
For ions with a positive net charge:
Number of electrons = Z - net charge
For ions with negative net charge:
Number of electrons = Z + net charge
a) Atomic number=9 Protons = 9, neutrons = 9, electrons = 10
b) Atomic number=43, Protons = 43, neutrons = 56, electrons = 36
c) Atomic number=53, Protons = 53, neutrons = 78, electrons = 52
d) Atomic number=81, Protons = 81, neutrons = 120, electrons = 80
e) Name the elements in parts (a), (b), (c), and (d) are F, Tc, I and Tl.
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