Answer:
Heavy medals
Explanation:
Answer:
Metals I think
Explanation:
Hope this helps and sorry if its incorrect
PLEASEEEE HELP URGENTTTT
Answer:
i don't see the question
Explanation:
I need help with my science vocabulary!!! Please help!
Answer:
1. B
2. E
3. A
4. D
5. C
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hope I helped!!!
GL :)
Different solutions of salt X are made up. What volume of: a) a 4 mol/dm³ solution contains 2 moles of X? b) a 6 mol/dm³ solution contains 0.03 moles of X?
Answer:
a. 0.5dm³
b. 5x10⁻³dm³
Explanation:
a. A solution that is 4mol/dm³ contains 4 moles in 1dm³. The volume that contains 2 moles is:
2 moles * (1dm³ / 4mol) =
0.5dm³b. And for the 6 mol/dm³ containing 0.03moles:
0.03 moles * (1dm³ / 6mol) =
5x10⁻³dm³- Your science class is going to play a game of tug-of-war and you need to divide up the
teams. There are 11 people participating. If you want equal teams, how would you
decide who is on which side and why? Use what you have learned about Newton's
Laws of motions to explain.
Answer:
I will measure by weight and make sure the weight of each pupils on both teams are the same
Does the Sun or the Moon have a greater influence on the high and
low tides of Earth's bceans? Why?
Explanation: Because ocean tides are the effect of ocean water responding to a gravitational gradient, the moon plays a larger role in creating tides than does the sun. But the sun's gravitational gradient across the earth is significant and it does contribute to tides as well.
The work done on a machine, the product of the input force and the distance through which the force is exerted.
A- Work, input
B- Work, output
C- Mechanical Advantage
D- Power
A group of students collects data to determine whether compounds were ionic or covalent. They placed each compound in a small bowl and
stuck two open ends of a battery powered circuit in the compound
Answer:
The Answer is Yes, as all of these compounds are covalent since they are not conductive.
Explanation:
.
According to the concept of conduction, only ionic compound can conduct electricity that in aqueous state.
What is conduction?Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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Cuantas moléculas de K² Cr ² 0⁷ hay en 0.5 dm³ de una solución de dicromoto de potasios de 30% en p/p y una densidad relativo de 1.15? (Coronel R., 2018)
Answer:
El número de moléculas de K₂Cr₂O₇ presentes en la solución es de aproximadamente 3,52058347 × 10²³ moléculas
Explanation:
Los parámetros dados de la solución de dicromato de potasio son;
El volumen de la solución, V = 0,5 dm³ = 0,0005 m³
El porcentaje en masa de dicromato de potasio en la solución = 30% p / p
La densidad relativa de la solución, RD = 1,15
Por lo tanto, la masa de dicromato de potasio en la solución, m = 30% de la masa de la solución.
El RD de la solución = (La densidad de la solución) / (La densidad del agua)
La densidad del agua = 997 kg / m³
Por lo tanto, tenemos;
RD = 1,15 = (La densidad de la solución) / (997 kg / m³)
La densidad de la solución, ρ = 1,15 × 997 kg / m³ = 1,146,55 kg / m³
La masa de la solución, m = ρ × V
∴ m = 1.146,55 kg / m³ × 0.0005 m³ = 0,573275 kg
La masa de dicromato de potasio en la solución, m₁ = 0.3 × m
∴ m₁ = 0.3 × 0.573275 kg = 0.1719825 kg = 171.9825 g
La masa de dicromato de potasio en la solución, m₁ = 171,9825 g
La masa molar del dicromato de potasio, K₂Cr₂O₇ = 294,185 g / mol
El número de moles de dicromato de potasio, K₂Cr₂O₇ en la solución, n = (Masa, m) / (Masa molar)
∴ n = 171,9825 g / (294,185 g / mol) = 0,584606625 moles
∴ El número de moléculas de K₂Cr₂O₇ presentes en la solución = n ×
Dónde;
= Número de Avogadro = 6.0221409 × 10²³ mol⁻¹
Por lo tanto, tenemos;
El número de moléculas de K₂Cr₂O₇ presentes en la solución = 0.584606625 moles × 6.0221409 × 10²³ mol⁻¹ = 3.52058347 × 10²³ moléculas
El número de moléculas de K₂Cr₂O₇ presentes en la solución ≈ 3.52058347 × 10²³ moléculas
Can someone help me plzzzz!!!!
Most plates, bowls, and cups are made from a synthetic material called ceramic, which is also called china. It’s usually painted and can break if dropped. Consider a cup made of ceramic. What are the pros of using ceramic?
Answer:
Look below.
Explanation:
Ceramic is stronger than glass. Knowing this and the properties of a glass plate, bowl, or cup we can conclude the pros of using ceramic. Ceramic products will last longer or stay in better condition. Ceramic products are solid which means high hardness or efficient when heated up because it wont melt (high melting points).
Answer:
Ceramic is stronger than glass. Knowing this and the properties of a glass plate, bowl, or cup.
Explanation:
Hope this helps! The first answer has more info.
Which term represents the fixed proportion of elements in a compound?
1.
atomic mass
2.
molar mass
3.
chemical formula
4.
density formula
Answer:
atomic mass
because skkskssjsjjsjsjsj skskskkskske sjjsjsjsk
Please help!!!!!!!!!!!!!
Write dissociation equations to describe what would occur when each of the following ionic compounds dissolve in water.
a. NaBr
b. K2SO4
c. Pb(C2H3O2)2
d. NH4NO3
e. LiI
f. HCl
Which subatomic particles have approximately the same mass?
protons and electrons
neutrons and electrons
protons and neutrons
electrons and atoms
Explanation:
protons and neutrons have approximately the same size, the electron is 1847th, (I think), the size of a proton
The subatomic particles which are having approximately the same mass are neutrons and protons. Thus, option c is correct.
What are subatomic particles?An atom is made of subatomic particles namely neutrons, protons and electrons. The neutrons and protons are located inside the nucleus whereas, the electrons are revolving around the nucleus through circular paths definite energy.
The electrons are having negative charges and protons are of positive charge. For a neutral atom the number of electrons and protons are equal. Electrons have negligible mass.
The mass of an atom is mainly contributed by the nucleus. The mass of neutrons and protons are have approximately same mass. Therefore, option c is correct.
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I have an irregular object that I want to find the density of. I put it in a graduated cylinder and the water rises by 12 mL. I put the object on a scale and it measures 42 g. What is the density of the object?
Answer:
12
Explanation:
The relative formula mass of a compound with formula XS0, is 120. Calculate the ralative
atomic mass of Y.
[Relative atomic mass: S, 32; 0, 16]
Answer:
72
Explanation:
Relative atomic mass of YSO = Relative atomic masses of Y + S + O
This implies; Y + 32 + 16 = 120
Y = 120 - 48
Y = 72
Hence, the relative atomic mass of Y = 72
can someone help me with this?
Answer:
165.27 K
Explanation:
Initial Temperature, T1 = 303K
Initial Pressure P1 = 3.3 atm
Final Pressure P2 = 1.8 atm
Final Temperature T2 = ?
Using the equation
P1 / T1 = P2 / T2
3.3 / 303 = 1.8 / T2
T2 = 1.8 * 303 / 3.3
T2 = 165.27 K
The tablet has a mass of 1.20 g and contains 700 mg of lithium carbonate.
Calculate the percentage by mass of lithium carbonate in this tablet.
Answer:
The right answer is "58.3%".
Explanation:
The given values are:
Mass of lithium carbonate,
= 700 mg
i.e.,
= 0.7 g
Mass of tablet,
= 1.20 g
Now,
The percentage of active ingredient will be:
= [tex]\frac{Mass \ of lithium \ carbonate}{Mass \ of \ tablet}\times 100[/tex]
On substituting the given values, we get
= [tex]\frac{0.7}{1.20}\times 100[/tex]
= [tex]0.583\times 100[/tex]
= [tex]58.3[/tex]%
Question 10 (4 points)
A 3.4 L balloon is let go near the surface of the Earth where the pressure is about 1.15 atm. As the balloon floats up to the top of the
atmosphere where the pressure is only about 0.35 atm it expands. What is the volume of the balloon at the top of the atmosphere?
Why does air with higher amounts of water vapor have a lighter density?
Answer:
moist air is less dense than dry air because water has a lower molecular weight than nitrogen and oxygen
Answer:
Water vapor is a relatively light gas when compared to diatomic Oxygen and diatomic Nitrogen. Thus, when water vapor increases, the amount of Oxygen and Nitrogen decrease per unit volume and thus density decreases because mass is decreasing.
There are the same number of atoms in a mole of calcium (Ca) than in a
mole of helium (He).
True
False
Answer:
True
Explanation:
A mole is defined as a certain amount of a unit. Such as atoms or molecules.
A chemical reaction at equilibrium always has _______.
A. A forward reaction rate that equals the reverse reaction rate.
B. A high Keq value.
C. Equal concentrations of reactants and products.
D. Zero energy
Answer:
A
Explanation:
how many moles are there in 36.0g of Beryllium
Answer:
4.00 mol
Explanation:
[tex]\frac{36.0g Be }{1} *\frac{1 mol}{9.0122 g}[/tex] = 3.994585118 mol
(If you round Be mass to 9 you get 4 mol)
For each of the following solutions, state whether the solution is saturated, unsaturated or supersaturated in the following conditions:
A) at 30o C, 70 g of KNO3 is dissolved in 100 g of water ________________________________
B) at 20 oC 0 g of KClO3 is dissolved in 100 g water________________________________
C) at 100 oC , 30 g of NaNO3 is dissolved in 100 g of water_____________________________
D) 50 g of NH4Cl at 70o C is dissolved in 100 g water. ________________________________
Answer:
C.at 100•C.30 g of NaNO3 is dissolved in 100 g of water
1 point
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Which of the terrestrial planets has the densest atmosphere?
Earth
Mars
Mercury
Venus
Venus. It's got the thickest and densest atmosphere of the terrestrial planets.
Answer:
venus
Explanation:
took the test
NH₃ + _O₂ → _N₂ + _H₂O
Answer:
4NH3 + 3O2 → 2N2 + 6H2O
Explanation:
What is the mass of H2O
Answer: 18.01528 g/mol
Explanation:
The atomic mass of hydrogen is 1.00794 g/mol.The atomic mass of water is 15.9994 g/mol.So, the mass of water is 2(1.00794)+15.9994 = 18.01528 g/mol
Weathering and erosion affect the most in the formation of igneous rock. A. True B. False
Answer:
true
Explanation:
19 Down syndrome is a genetic disorder caused by the
A chemist found a 60.00 gram sample containing copper and oxygen. Given the following percent composition, what is the mass of copper in the sample?
Copper- 57.08 %
Oxygen- 42.9296
choose an answer:
O 0.5708 g Cu
o 25.02 g Cu
34.25 g cu
63.5 g Cu
.4.2 moles of copper would contain how many grams of copper?
Answer:
0.015736631731344 mole
Explanation:
You can view more details on each measurement unit: molecular weight of Copper or mol The molecular formula for Copper is Cu. The SI base unit for amount of substance is the mole. 1 grams Copper is equal to 0.015736631731344 mole.