Answer:
Diamonds are very important in our daily lives ,so therefore it has many uses
1.They are used ad beauty products
2.They are used in automative industry
3.They are used in making windows
4.They are used as medicine
Explain what happens to the particles in a substance during a physical change.
Answer:
The particals in a physical change alwayd stay the same, but for a chemical change that is the only time they will change. Not during a physical change
Explanation:
What do we have to have to be able to determine the number of neutrons?
A. average atomic mass
B. mass number
Answer:
Answer is A :)
Explanation:
Answer:
B. Mass number
Explanation:
In order to gain the number of neutrons you need to subtract the Protons from the atomic mass (also known as the mass number or nucleon number.
For example :
Carbon - protons= 6
Nucleons=12
Therefore carbons neutrons = 6
Aluminum carbide powder decomposes in water:
Al4C3 (s) + 12 H2O (l) → 4 Al(OH)3 (aq) + 3 CH4 (g)
Which of the following pairs of quantities represent the correct stoichiometric amounts for this reaction?
a.
1 mol Al4C3 and 1 mol H2O
b.
4 mol Al4C3 and 24 mol H2O
c.
7.2 g Al4C3 and 1.8 g H2O
d.
1 moles Al4C3 and 12 moles H2O
Answer:
d. 1 mole Al₄C₃ and 12 moles H₂O
Explanation:
The coefficients in a balanced chemical equation indicate the number of moles of reactants and products. If a substance does not have a coefficient written in front of it, it is assumed to be 1.
Which of the following is correctly balanced?
A.
Na2S + HCl → 2NaCl + 2H2S
B.
Na2S + 2HCl → NaCl + 2H2S
C.
Na2S + 2HCl → 2NaCl + H2S
D.
Na2S + HCl → NaCl + H2S
Answer:
A.) Na2S + HCl → 2NaCl + 2H2S
Explanation:
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Some of the physical characteristics of the planets in the Solar System are shown below. The distance of each planet from the Sun is given in astronomical units (AU).
PHYSICAL DATA OF PLANETS
Planet Distance from the Sun (AU) Mass (kilograms) Mean Orbital Speed (kilometers/second)
Mercury 0.38 3.33 x 1023 47.87
Venus 0.72 4.87 x 1024 35.02
Earth 1.0 5.97 x 1024 29.78
Mars 1.5 6.47 x 1023 24.13
Jupiter 5.2 1.90 x 1027 13.07
Saturn 9.5 5.68 x 1026 9.69
Uranus 19.2 8.68 x 1025 6.81
Neptune 30.1 1.02 x 1026 5.43
Which conclusion can most accurately be drawn from this information?
Convection creates circulating current in a pot of boiling water because _____ water rises and ____ water sinks
The answer should be 'hotter' and 'cooler'
The hot water molecules would become less dense and thus rise above the denser cooler molecules.
Hope that helps!
Write the IUPAC nomenclature for the following a. Al2 (CO3)3
Answer:
Aluminum carbonate | Al2(CO3)3 - PubChem
Explanation:
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How are the environments of a desert and a tundra different?
A tundra is at a higher latitude than a desert.
A tundra is less humid than a desert.
A tundra is much warmer than a desert.
A tundra receives less precipitation than a desert.
Answer:
A tundra is less humid than a desert
Explanation:
1) according to the kinetic molecular theory of gases, a gas can be compressed much more than a liquid or solid because gas particles do not attract or repel one another b) the particles of a gas are very far apart. c) gas particles move faster when the temperature increases. d) gas particles move rapidly. in) a gas is composed of very small particles.
Answer:
option (b)
Explanation:
A gases can be compressed much more than a solid or liquid because the particles of a gas are very far apart
A gas has a volume of 87.5 L and 8.7 moles. if the amount of moles is increased to 18, what is the volume?
Answer:
V2 = 181
Explanation:
Follow this equation: V1/n1 = V2/n2
V1 = 87.5L
n1 = 8.7
n2 = 18
V2 =?
V1/n1 = V2/n2 (to find V2, switch n2 to the other side)
So it going to be ---> n2×V1/n1 = V2
18×87.5/8.7 = V2
1575/8.7 = V2
181 = V2
So the answer is: 181
LGBTQ
any friends out there for me?
Answer:
ill be your friend
Explanation:
im apart of the lgbtq+ community im bi
Answer:
Sure! I'm born female and I'm pan
Explanation:
What is the fluoride ion concentration for a saturated solution of BaF 2 if the K sp for BaF 2 is 1.8 × 10 -7 ?
[tex]\\ \rm\rightarrowtail BaF_2\longrightarrow Ba^{2+}+2F-[/tex]
BaF_2 be xBa2+ is also xF- is 2xNow
[tex]\\ \rm\Rrightarrow K_{sp}=[Ba^2+][F-]^2[/tex]
[tex]\\ \rm\Rrightarrow 1.8\times 10^{-7}=x(2x)^2[/tex]
[tex]\\ \rm\Rrightarrow 4x^3=1.8\times 10^{-7}[/tex]
[tex]\\ \rm\Rrightarrow x^3=0.45\times 10^{-7}[/tex]
[tex]\\ \rm\Rrightarrow x=\sqrt[3]{0.000000045}[/tex]
[tex]\\ \rm\Rrightarrow x=0.00376M[/tex]
[tex]\\ \rm\Rrightarrow x=3.8\times 10^{-3}M[/tex]
So
[tex]\\ \rm\Rrightarrow [F-]=2x=7.6\times 10^{-3}M[/tex]
How many sigma bonds are present in acetylsalicylic acid.
Answer:13
Explanation:”13 sigma bonds”
What kind of a system is a coffee held in a cup??
don't spam..
Explanation:
Hope it helps you!!Answer:
open system
Explanation:
Coffee held in a cup is an open system because it can exchange matter water vapors and energy heat with the surroundings.
Spectroscope, PLS help pls I'LL GIVE BRAINLIEST
Answer:
I don't know what the correct answer is
Explanation:
Which of the following statements correctly explains why we experience seasons?
(13 Points)
A. As the Earth moves away from the Sun, we change from summer to fall to winter. As the Earth moves closer to the Sun, we change from winter to spring to summer.
B. As the Earth spins on its axis, we experience seasons. Each 1/4 spin of the Earth on its axis represents a change in season.
C. Earth's tilt on its axis means one hemisphere leans toward the Sun, causing it to experience warmer temperatures. As Earth revolves around the Sun, a different hemisphere leans toward the Sun, causes warmer temperatures in that hemisphere.
D. The Moon moving in front of the Sun causes temperatures on Earth to drop, which causes winter. When it moves behind the Sun, a rise in temperature causes summer.
A proton and an electron are near each other. What way does their electric force point?
A. No force between them
B. Repulsive
C. Outward
D. Attractive
Answer:
D
Explanation:
proton is positive while electron is negative so they will attract
The attractive force will be there if a proton and an electron are near each other. Hence, option D is correct.
What is an attractive force?The force by which one object attracts another.
Proton is positive while electron is negative so they will attract.
Hence, the attractive force will be there if a proton and an electron are near each other.
Learn more about attractive force here:
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Why is it more comfortable to exercise on a day when the relative humidity is low?
Sweat evaporates quickly at low relative humidity, the amount of water vapor in the atmosphere, so it makes the body feel cooler. If the humidity is high that means there is a lot of water vapor in the air and thus the sweat cannot evaporate and forms pools on our skin making us feel uncomfortable.
Hope that helps!
PLEASE HELP ME NOW! WHATS NEWTONS FIRST LAW?!!!
Answer:
Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Explanation:
Hope this helps!
1. How many ATONS of oxygen are present in 8.18 grams of dioxygen difluoride ?
atoms of oxygen.
A 2.0 mol sample of CO(g) and a 2.0 mol sample of H2O(g) are introduced into a previously evacuated 100. L rigid container, and the temperature is held constant as the reaction represented above reaches equilibrium.
CO(g) + H2O (g) CO2(g) + H2(g) Kc = 1.5 x 10^3
Which of the following is true at equilibrium?
For the chemical reaction CO(g) + H2O (g) >>CO2(g) + H2(g) at Kc = 1.5 x 10^3 the solve to discover
CO2= 1.94>>CO= 0.06 is True about the reaction
What is true about the reaction?
Generally, the equation for the Chemical Reaction is mathematically given as
CO(g) + H2O (g) >>>CO2(g) + H2(g)
Therefore
Kc = x .x / ( 2 - x ).(2 - x)
Kc= 1.5 x 103
Kc= x2 / (2-x)2
Where
Kc = 1.5 x 103
x=1.94
In conclusion,
[CO] = [H2O]
CO= 2 - 1.94
CO= 0.06
[CO2] = [H2]
CO2= x
CO2= 1.94
Read more about Chemical Reaction
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Write a few sentences about respiration in your own words
Answer:
Is production of energy
According to Avogadro's law, what do equal volumes of ideal gases at
the same temperature and pressure contain?
Answer:
contain an equal number of molecules
Answer: equal volumes of different gases contain an equal number of molecules.
Explanation:
hello people ~
Terylene is a popular form of
A. Polyester
B. Monomer
C. Plastic
D. Nylon
Answer:
Polyester
Explanation:
Terylene is popular form of polyesterIt is made by the mixing ethylene glycol and terephthalic acid with the elimination of waterWhat do scientists call the type of rocket in which part of the rocket is dropped off after fuel has been used?
A. multistage rocket
B. segmented rocket
C. break away rocket
D. high velocity rocket
Answer:
Multistage rockets
Explanation:
Multistage is a launch vehicle that uses two or more rocket stages, each of which contains its own engines and propellant.
Nitrogen gas at 20. °C in a balloon has a volume of 3. 0 L and pressure of 1. 5 atm. If the temperature of the balloon is increased to 30. °C and the pressure to 2. 5 atm, what is the new volume of the balloon? Use the formula: P1V1 T1 = P2V2 T2 Temperature Conversion: °C 273 K.
Answer: 1.9L
Explanation: I got you
what's the gravity and motion
Answer:
Gravity : Gravity is the force acting on objects that pulls it to the crust of the earth. It is the universal force of attraction between all matter.
Motion: Motion is the movement of objects from one position to another.
Does q for the formation of 1 mol of no from its elements differ from q for the decomposition of 1 mol of no to its elements and what is the relationship between the two qs?.
Answer:
Yes, the Qs for the two reactions are reciprocal.
Explanation:
No, the Qs are the same.
What are decomposition and examples?Decomposition reactions are processes in which chemical species break up into simpler parts. Usually, decomposition reactions require energy input. For example, a common method of producing oxygen gas in the laboratory is the decomposition of potassium chlorate (KClO3) by heat.
How do elements decompose?When bonds in a single chemical compound are broken, it results in it breaking apart to form two or more products. When this happens, it is known as chemical decomposition and it takes place as a chemical reaction.
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What are the products in the reaction below? (select all that apply)
Answer:
6CO₂ + 6H₂O
Explanation:
The products are on the right hand side of the equation which include Carbon dioxide and water
What is the best definition
of thermal expansion?
A. Thermal expansion is when an object's volume
increases due to heat increase.
B. Thermal expansion is when an object's volume
decreases due to heat increase.
C. Thermal expansion is when an object's volume stays the
same due to heat increase.
Answer:
B.
Explanation:
thermal expansion♡
answer:
I think is B. Thermal expansion is when an object's volume
decreases due to heat increase.