Answer:
Explanation:
chemical energy of 1 kg coal is 3 million joules .
If this energy is used to lift one kg of coal , let height attained be h
chemical energy = gravitational energy of 1 kg of coal
3 x 10⁶ = m g h = 1 x 10 x h
h = 3 x 10⁵ m
= 300 x 10³ m
= 300 km .
i kg coal can be lifted by height of 300 km .
Which sig figs rule(s) apply in determining how many sig figs are in the number below?
Select all that apply.
92.064
5
Rule #4
Rule #2
Rule #3
Rule #1
Rule #5
Explanation:
For 92.064 the rule that is applied is all digits between two non-zero digits are significant.
For 5, the rule is all non-zero digits are significant
what is the product of aluminum +zinc sulfate solution
Answer:
ZINC ALUMINATE
4. Isotonic solution are the solution
having same
1. Concentration
2. surface tension
3. osmotic pressure.
4. viscosity
Answer:
My answer is concentration.
Write the steps to separate the
Water from salt solution
Answer:
try use distillation
you also can get the salt by evaporate them under the sun
pls help
will give the brainliest!
Please answer correctly
Urgent!!!!
a)Green color appears.
Burning splint test tells us us that it is hydrogen gas.
b)[tex]Ni+ H_2SO_4 \longrightarrow NiSO_4 + H_2 \uparrow[/tex]
c)There would be an effervescence. Upon passing the gas through lime water it turns milky $\implies$ gas is Carbon Dioxide.
d)$\NiCO_3+ H_2SO_4 \longrightarrow NiSO_4 + CO_2 +H_2O$
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:
Lab Safety
What should you do if a piece of lab
equipment is broken?
J. Try to fix it.
k. Tell a teacher immediately.
L. Pick up broken glass immediately
before anyone gets hurt.
M. Pretend like nothing happened.
Q3
Answer:
Tell a teacher immediately
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
Which best describes nitrogen fixation?
Answer:
Nitrogen fixation is the process of converting nitrogen to a usable form.
HELP ASAP
A pure sample of gold has a volume of 25.0 cm and a mass of 483 g. What is the density of gold?
0 cm
0.0514 g/cm3
0.00197 g/cm
19.4 g/cm
508 g/cm3
Answer:
the correct answer is D
Explanation:
The density of gold is 19.4g/cm
The density of gold is found to be 19.32 g/[tex]cm^3[/tex] when it has a volume of 25.0 cm and a mass of 483 g.
What is density?Density may be defined as a type of physical quantity that describes the mass per unit volume of any substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. It is commonly expressed in units of grams per cubic centimeter.
It is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (it's mass).
Another way to put it is that density is the amount of mass per unit of volume. If an object is heavy and compact, it has a high density.
According to the context of this question,
The mass of gold = 483 g
The volume of a pure sample of gold = 25.0 cm.
The formula for calculating density is as follows:
Density = Mass/Volume.= 483g/25.0 cm = 19.32 g/[tex]cm^3[/tex].
Therefore, the density of gold is found to be 19.32 g/[tex]cm^3[/tex] when it has a volume of 25.0 cm and a mass of 483 g.
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The diagram illustrates a type of plate boundary. Which crustal feature is most likely to form at this type of
boundary?
1. trench
2. ridges
3. tsunami
4. earthquake
Do the following problem using significant figures
22.33 mL
+
55.666 mL +
0.001 mL
mL
Answer:
80.00 mL
Explanation:
Let's consider the following addition.
22.33 mL + 55.666 mL + 0.001 mL
22.33 mL has 4 significant figures.
55.666 mL has 5 significant figures.
0.001 mL has 1 significant figure.
For addition and subtraction, we look at the places to the decimal point. Add or subtract in the normal fashion, then round the answer to the least number of places to the decimal point of any number in the problem.
22.33 mL + 55.666 mL + 0.001 mL
77.997 mL ≈ 80.00 mL
1. What is the volume of 4.62 g of mercury? The density of mercury is 13.5 g/cm?
Answer:
The answer is
0.34 cm³Explanation:
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
mass = 4.62 g
Density = 13.5 g/cm³
Substitute the values into the above formula and solve for the volume
That's
[tex]volume = \frac{4.62}{13.5} [/tex]= 0.34222……
We have the final answer as
0.34 cm³Hope this helps you
A sample of gasoline contains various hydrocarbons, which comprise atoms of carbon, hydrogen, and oxygen. The hydrocarbons mix together uniformly to form gasoline. Which term or terms could be used to describe this sample of gasoline
Answer:
mixture homogenous mixture (of hydrocarbons)compoundExplanation:
Mixture can be easily separated by physical methods. Homogeneity and heterogeneity of a mixture is determined by whether the components there in are in a single phase and evenly distributed or not.
A solution has a solute evenly dissolved in solvent to form a liquid substance.
An element is the basic form of substance which cannot be broke down into any other simpler unit.
I hope this was helpful.
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:)
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
What is the speed of a man that travels 2 meters in 6.5 seconds?
Answer:
0.305556 m / s
Explanation:
Speed = distance / time
2 metres = 0.002 km
6.5 sec = 0.00180556 hrs
Therefore,
Speed = 0.002 / 0.00180556
= 1.1 km / hr
= 0.305556 m / s
≈ 0.31 m/s
Explanation:v = d/t
= 2m/6.5s
= 0.3079 m/s
≈ 0.31 m/s
what is described by the wavelength of a wave
Answer:
The answer is A
Explanation:
Wavelength is the distnce between the peak or crests in a wave.
The distance from one peak to the next peak is the wavelength. The correct option is A.
What is a wave?A wave is a dynamic disturbance (change from equilibrium) of one or more quantities that propagates.
The distance between identical points in abutting cycles of a waveform signal propagated in space or along a wire is defined as the wavelength.
Thus, the correct option is A.
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Write a simple procedure for measuring out 2.6 grams of sodium bicarbonate NaHCO3 or commonly known as baking soda?
PLEASE I REALLY NEED THIS!!! :/
Answer:
See explanation
Explanation:
Since baking soda is a solid, all we need is to have a spatula, a filter paper and a triple beam balance.
The triple beam balance is set at zero and the filter paper us placed on the triple beam balance. This is the ensure that the mass of the filter paper is recorded as zero gram.
The triple beam balance is now adjusted to 2.6 g and sodium bicarbonate is added to the filter paper on top of the beam balance using a spatula. The 2.6g mass is the point when the pointer of the triple beam balance focuses at the zero mark.
The density of osmium ( the densest metal) is 22.57 g/cm^3. What volume would be occupied by 1.50 kg of osmium.
Answer:
Density = Mass / Volume
V = 1.00 * 4.00 * 2.50 = 10 cm³
22.57 g/cm³ = Mass / 10 cm³
M = 22.57 g/cm³ * 10 cm³
M = 225.7 g
Answer: The mass of the block of osmium is 225.7 g.
Explanation:
Thanks to:
HomertheGenius
The density of the osmium is 22.57 g/cm^3 the volume would be occupied by 1.50 kg of osmium will be 33.85 ml.
What is density?The density of a substance is the division of mass of the given substance and the volume of the given substance and its unit will be centimeter cube and it cannot be effect by the temperature.
The density can be calculated by the formula
Density = mass of substance / volume of substance in liter
Density = 22.57 g/cm³
mass = 1.50 kg
Substituting the value in the equation,
22.57 g/cm³ = 1.50 kg / volume
Volume = 22.75 g/cm³ × 1.50 kg
volume = 33.85 ml
Therefore, density of the osmium is 22.57 g/cm^3 the volume would be occupied by 1.50 kg of osmium will be 33.85 ml.
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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
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.
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Which is NOT one of the 3 dimensions of the Science Standards
Framework?
3 dimensions of the science standards framework
Answer:
The term "three-dimensional learning" refers to the three pillars that support each standard, now called "performance expectations." These three dimensions are: Science and Engineering Practices, Crosscutting Concepts, and Disciplinary Core Ideas. You can use this rubric to evaluate your own curriculum for NGSS.
Explanation:I HOPE IT HELP
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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1. What are the subatomic particles that all atoms are made of?
*
Answer:
The three main subatomic particles that form an atom are protons, neutrons, and electrons.
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!
How might you measure the amount of energy in the world's largest rice cake?
Answer:
When you eat the largest rice cake in the world, you increase how many kilograms and multiply by 7,700 will get the energy of the cake.
Explanation: one kilo=7.700 calories
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:
A 1.0 mole pure sample of molten tin is dissolved in a 5.0 mole pure sample of molten copper. The solution is set aside to cool and solidify. The atomic radius of tin is 140 pm and the atomic radius of copper is 128 pm. a. Identify the type of alloy that is formed. Justify your answer. b. Identify the solvent in this solution. Justify your answer.
Answer:
a. Bronze
b. Copper
Explanation:
a. The alloy formed from the mixture of molten tin and molten copper, with copper having the over triple of the quantity of tin, is bronze. Although, these two metals are often not the only metals present in bronze.
b. The solvent in this mixture is molten copper. This is because, it has the larger percentage of the constituents and hence can easily allow other constituents to be dissolved in it.
The characteristics of the mixtures allow to find the answers to this question about bronze are:
We have a homogeneous solution The solute is tin and the solvent is copper
In chemistry when materials do not react with each other, a new compound is not formed, therefore there is a mixture of unreacted elements.
The mixture is the union of two or more components united, but that do not react chemically, we can have two types of mixture:
Homogeneous. In this case the materials cannot be distinguished from each other, this special case is called a solution. Heterogeneous. There is a heterogeneous composition that can be distinguished. The parts of can be separated by physical methods, for example: deposition in time, filtration, etc.
In mixtures, the material that is in less quantity is called solute and the material that is in greater quantity is called solvent.
In this case we have a combination of Tin and Copper, by heating when they are taken to the liquid state the mixture is formed, the result is a material where no phase or separation can be distinguished, therefore we are in the presence of a homogeneous solution, that cooling would be a solid solution.
Therefore, copper and tin maintain their chemical properties, but the physical properties are altered, this solution is widely used industrially and is called Bronze.
We have 1 mole of tin and 5 moles of Copper, so the solute is the material in the least amount of Tin and the solvent is the material in the greatest amount of Copper.
In conclusion, using the characteristics of the mixtures we can find the answer to this question about bronze:
We have a homogeneous solution in solid state The solute is tin and the solvent is copper
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Does a basketball have positive or negative acceleration when it is thrown?
Answer:
The basketball has a constant negative acceleration due to gravity when it is thrown
Explanation:
Before the basket ball is thrown, and when the basket ball is in free fall flight it is always under and experiences an attractive force between the Earth and all objects on Earth known as gravitational force such that the direction of the acceleration of the gravitational force is always towards the Earth and therefore, downwards, resulting in an increasing decreased upward speed of the thrown ball in the projectile motion, equivalent to the ball having a negative acceleration, same as all objects in free fall.