Answer: 6, 7 and 6 significant figures, respectively.
Explanation:
A. 67.20 x 8.02 = 538.944, has 6 significant figures .
B. 486.02 x 0.056 = 27.21712, has 7 significant figures .
C. 11.264 + 245.3 = 256.564 = 6 significant figures.
If Maria winks exactly five times every minute and she sleeps exactly eight hours every day, how many times does Maria blink every day
Answer:
4800 times a day
Explanation: she blinks 300 times every hour and i times it by 16 as the hours everyday (24-8) so 300 x 16 equals 4800
The protocol for a given lab experiment specifies that you should prepare 100 mL of a 0.10 M (mol/L) aqueous solution of NaNO3. You use a tared balance to deliver a given mass of solid into a weighing boat. To which piece of laboratory glassware should you transfer the solid to finish preparing the solution
Answer:
It should be transferred to a Beaker to finish preparing the solution
Explanation:
NaNO₃ is sodium Nitrate. It is a salt that is soluble in water hence it's aqueous solution can be prepared by dissolving it in water.
A beaker is a laboratory glassware that is used for various functions; one of which includes the preparation of reagents or aqueous solutions of a compound. In the example narrated in the question, the measured NaNO₃ solid can be transferred to a 100 mL or 200 mL beaker and then added to it is the desired volume of water to make the solution 100 mL. This solution can then be stirred with a "glass rod"
what happens when ethylene gas is passed through cold dilute alkaline kMnO4 solution
Answer:
it gives CH2OH-CH2OH(ethylene glycol +MnO2
Explanation:
given the volume of a cube is 75 cm3 and the mass is 15 grams what is the density
Answer:
Density = 0.2 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]From the question
mass of cube = 15 g
volume = 75 cm³
Substitute the values into the above formula and solve for the density
That's
[tex]Density = \frac{15}{75} [/tex]Density = 0.2 g/cm³Hope this helps you
Isotopes of an element have the same number of protons but different numbers of what?
I have no idea what subject to put this under qwq
Answer:
Isotopes is a phenomenon whereby atoms of the same element exhibit different mass numbers but have the same atomic number.I hope this helps... Thank you for the question
HELP PLZ!!! Which must be kept in mind when determining if an explanation is correct? whether people reading the explanation agree the information that is on the Internet that there may be more than one way to interpret data whether a person of authority says it is correct
Answer: C. that there may be more than one way to interpret data
Enge 2020 C is the correct answer
13) 2.4 L to mL
This is for chemistry
Answer: 2400 milliters
Explanation:
As a sound source approaches someone, the frequency of the sound wave
Answer:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. As the source of sound waves approaches a listener, the sound waves get closer together, increasing their frequency and the pitch of the sound.
Explanation:
1. Based on this graph, how does metal A differ from metal B?
A. Metal A is have higher density than metal B.
B. Metal B has higher density than metal A.
C. Both metals A and B have the same density.
D. None of the abaove.
Answer:
B.Metal B has higher density than metal A
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the correct option is option B that is Metal B has higher density than metal A.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically, the formula for density can be given as
Density = Mass of the substance ÷volume marked on the graduated cylinder
From given graph we can see that Metal B has higher density than metal A since the mass of metal B is higher than mass of metal A.
Therefore, the correct option is option B that is Metal B has higher density than metal A.
To know more about density, here:
https://brainly.com/question/16894337
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4. Isotonic solution are the solution
having same
1. Concentration
2. surface tension
3. osmotic pressure.
4. viscosity
Answer:
My answer is concentration.
Mr block student are studying chemical
Answer:
egg
Explanation:
man
A chemist compresses a 1.8 L sample of carbon dioxide gas at 2.4 atm to a final volume of 1.5 L. Assuming the temperature is constant,what is the final pressure,in arm,exerted by the gas
Answer:
THE PRESSURE EXERTED BY THE GAS IS THEREFORE 2.88 atm.
Explanation:
Boyle's law states that at constant temperature, the volume of a given mass of gas is inversely proportional to the pressure of the gas.
Mathematically, P1 V1 = P2 V2
Write out the values of the variables given:
P1 = 2.4 atm
V1 = 1.8 L
V2 = 1.5 L
P2 = unknown
Re-arranging the variables by making P2 the subject of the equation, we have:
P2 = P1 V1 / V2
P2 = 2.4 * 1.8 / 1.5
P2 = 2.9=88 atm
Hence, the pressure exerted by the gas is therefore 2.88 atm
Calculate the number of grams of sulfuric acid in 1 gallon of battery acid if the solution has a density of 1.30 g/mL and is 38.8 % sulfuric acid by mass.
Answer:
The number of grams of sulfuric acid in 1 gallon of battery acid is 1909.4 g.
Explanation:
We have:
V = 1 gallon = 3785.4 mL
% m/m = 38.8 %
The number of grams of sulfuric acid can be calculated as follows:
[tex] m = 1.30 \frac{g}{mL}*3785.4 mL*\frac{38.8}{100} = 1909.4 g [/tex]
Hence, the number of grams of sulfuric acid in 1 gallon of battery acid is 1909.4 g.
I hope it helps you!
difference between sodium ion and sodium atom.
(give in points not in paragraph)
Answer:
Explanation:
SODIUM ATOM;
SODIUM ATOM IS NEUTRAL
SODIUM ION;
IT IS A CHARGED SPECIE WITH A CHARGE OF +1
SODIUM ATOM:
THE NUMBER OF PROTONS AND ELECTRONS ARE SAME ie:11
SODIUM ION:
NUMBER OF PROTONS AND ELECTRONS ARE NOT SAME ie. ELETRON: 10, PROTONS:11
HOPE IT WILL HELP:)
Dec
Match each concept to the scientist who supported it.
Isaac Newton
Heinrich Hertz
Light is a wave because this property can
explain interference
Light is a wave because it bends when it
hits barriers and openings.
Light is made of particles because it travels
only in straight paths
Light is a wave made of electric and
magnetic fields
Light is a wave that has similar properties
James Clerk Maxwell
Christiaan Huygens
Thomas Young
as radio waves
Answer:the pic
Explanation:
describe in brief the process of extracting Petroleum from its reserve
Answer:
There are three steps to the Petroleum refining process; separation, modification, and treatment. It would be impossible to drive without gas or diesel fuel. Learn how we get petrol and crude oil and more about gasoline or oil refineries. What is Petroleum? Petroleum is a natural phenomenon.
Explanation:
If on average you walk 1.20 meters every second, how long do
you walk in one hour?
What is the coefficient of hydrogen, H 2, when the following equation is balanced? Al + H 2SO 4 → Al 2(SO 4) 3 + ? H 2
Answer:
3
Explanation:
Balancing the equation:
Original equation: Al + H2SO4 → AL2(SO4)3 + H2
We see that in aluminum in AL2(SO4)3 there is a subscript 2.
We put a 2 in the front of the reactant Al.
We also see a subscript 3 behind (SO4).
We add a 3 in front of H2SO4.
Now we have to balance the H2 on both sides. We add a 3 in front of the H2 on the right as there is 3 H2 molecules on the left.
2Al + 3H2SO4 → AL2(SO4)3 + 3H2
I hope it helps :)
The coefficient of hydrogen is 3
How do find the coefficient of hydrogen?The numbers placed in front of formulas to balance equations are called coefficients, and they multiply all the atoms in a formula.
Balancing the equation:
Given, the equation: Al + H2SO4 → AL2(SO4)3 + H2
We see that in aluminum in AL2(SO4)3 there is a subscript 2.
We put a 2 in the front of the reactant Al.
We also see a subscript 3 behind (SO4).
We add a 3 in front of H2SO4.
Now we have to balance the H2 on both sides. We add a 3 in front of the H2 on the right as there are 3 H2 molecules on the left.
2Al + 3H2SO4 → AL2(SO4)3 + 3H2
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
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is a toothpick a good model for showing the strength and brittleness of salt ?
Answer:
no a toothpick is stronger
Explanation:
i would not seem right
Define and explain auto-ionization of water??? Explain please??
Answer:
Hey there!
Auto-ionization of water is an ionization reaction in pure water or in another aqueous solution, in which a water molecule, H2O, loses the nucleus of one of its hydrogen atoms to become a hydroxide ion, OH−.
Let me know if this helps :)
Answer:
in pure water, H2O molecules undergo a reaction in which two molecules react in such a way that one molecule give its H+ ion to other molecule and become a hydroxyl ion(OH-) and molecule which gain H+ ion become H3O+ ion.
Explanation:
H2O + H2O ⇄ ( H3O+) +( OH-)
Chemicals used in a laboratory investigation must be safely discarded. Which method is the safest way to dispose of chemicals at the conclusion of a laboratory activity
Answer:
Disposing of the discarded chemicals can be done by certain sfae methods mention as follows:
Explanation:
Most of the chemical wastes are dispose through the EHS waste program. Organic chemicals and solvents that can not be drain should be closed in a tight fitted container that has label on it as Hazardous waste, including strong acid and corrosive liquids.
Recycling of these chemicals and incineration is also use for the industrial chemical waste under professional guidance. Incineration is the process of burning chemicals in to ash through high thermal burning.
The relative formula mass (M) of XCO, is 84
Relative atomic masses (A.): C = 12 O = 16
Calculate the relative atomic mass (A) of X.
Answer:
x = 56
relative atomic mass is 58.933
Explanation:
finding the relative molecular mass of x first...
x + (C ×1) + (O ×1) =84
x + (12 ×1) + ( 16 × 1) =84
x + 12 + 16 =84
collect like terms
x = 84-12+16
x= 56
now...
half of 56...
56÷2 =27
and 27 is the atomic number of cobalt...
so relative atomic mass of cobalt is 58.933.
Whh is most carbon compound poor conductor of electricity
Explanation:
Most of the carbon compound are convalent in nature and all of the electrons participates in bond formation as such there is no free electrons left to conduct electricity. Moreover carbon compound doesn't readily dissociates to form ions, which conduct electricity. Hence carbon compound are poor conductor of electricity.
Answer:
It is because all the valence electrons are used to form covalent bonds. So, there will be no electrons left to flow the electric current through them.
Explanation:
hope it helps
Abby fills a graduated cylinder with 3 mL of water. She then
drops a small rock into the cylinder, and the water level rises
to the 5 mL mark. What is the volume of the rock?
mL
Answer:
The volume of the rock is 2 mL
Explanation:
The level to which the graduated cylinder is filled with water by Abby = 3 mL
The level to which the graduated cylinder after the rock is dropped in = 5 mL
Therefore;
The volume of the rock = The level to which the graduated cylinder after the rock is dropped in - The level to which the graduated cylinder is filled with water by Abby
The volume of the rock = 5 mL - 3 mL = 2 mL
The volume of the rock = 2 mL.
SOLVE A 4.80-gram piece of magnesium displaces 2.76 mL of water when it is placed in a graduated cylinder. What is the density of magnesium?
Answer:
Density = 1.74 gm/mL
Explanation:
Given that:
Mass of piece of Magnesium = 4.80 grams
The volume displaced by this piece = 2.76mL
Let us learn about a property:
Volume of water displaced by a substance when immersed in the water is equal to the Volume of the substance itself.
So, volume of the piece of Magnesium = 2.76 mL
To find:
Density of magnesium = ?
Solution:
Let us have a look at the formula for Density of a Substance:
Density of a substance is given as the ratio of mass of substance and the volume of that mass of substance.
i.e.
[tex]Density = \dfrac{Mass}{Volume}[/tex]
Putting the given values:
[tex]Density = \dfrac{4.80}{2.76}\\\Rightarrow \bold{Density = 1.74\ gm/mL}[/tex]
So, the answer is:
Density of Magnesium = 1.74 gm/mL
Based on the data provided, do the Super Snail Snacks work? Explain your answer
Answer: No
Explanation: The snacks did not work because the result of the snails either stayed the same, or decreased.
Mercury is a liquid metal having a density of 13.6 g/mL. What is the volume of 1.50 lb of mercury metal? 1kg = 2.2 lbs
Hint: Convert lbs to kg to g then solve for volume.
a: 19.9 mL
b: 50.1 mL
C: 11.0 mL
D: 33.4 ml
Answer:
The answer is option BExplanation:
The denisty of a substance can be found by using the formula
[tex]Density(\rho) = \frac{mass}{volume} [/tex]Making volume the subject we have
[tex]volume = \frac{mass}{Density} [/tex]From the question
Density = 13.6 g/cm³
mass = 1.50 lbs
We must first convert the lbs to grams in order to solve
That's
if 2.2 lbs = 1 kg
Then 1.50 lbs = [tex] \frac{1.5}{2.2} [/tex]
= 0.681 kg
If 1 kg = 1000 g
Then 0.68 kg = 0.681 × 1000 = 681g
So the mass = 681 g
Substitute the values into the above formula and solve for the volume
That's
[tex]volume = \frac{681}{13.6} [/tex]= 50.0735
We have the final answer as
50.1 mLHope this helps you
Practicing Density Calculations: A 4.80 gram piece of magnesium displaces 2.76 mL of water when it’s placed in a graduated cylinder . What is the density of the magnesium?
Answer:
1.74 g/mL
Explanation:
Step 1: Given data
Mass of magnesium: 4.80 g
Volume of water displaced: 2.76 mL
Step 2: Calculate the volume of the piece of magnesium
The volume of the piece of magnesium is equal to the volume of water displaced in the graduated cylinder.
Step 3: Calculate the density of magnesium
The density of magnesium is equal to its mass divided by its volume.
ρ = m / V
ρ = 4.80 g / 2.76 mL
ρ = 1.74 g/mL
How many additional electrons does this atom of oxygen need in its valence shell to satisfy the octet rule?
Answer:
2
Explanation:
cause it is what it is :> mark me brainlest
Answer:
A-two
Explanation:
Which step of the scientific method will most likely come next? Analyze the data Construct a hypothesis Test with an experiment Do background research
Answer:
analyze data and construct a conclusion
Explanation: