Using the table below, identify the unknown material that has a mass of 15,06 g and a
volume of 0.78 ml
Substance Density (g/cm) Substance Density (g/cm")
Ice (00 0.917 Human fat 0.94
Water (4.0°C) 1.0000 Cork 0.22-0.26
Gold
19.31
Table sugar 159
Helium (250) 0.000 164 Balsa wood 0.12
Air (250) 0.001 185 Earth 5.54
Ole
Water
Gold
Hellum
O Air
lo
Answers
The unknown material : gold
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
mass of unknown the material : 15.06 g
volume = 0.78 ml
The density :
[tex]\tt \rho=\dfrac{m}{V}\\\\\rho=\dfrac{15.06}{0.78}=19.31~g/ml[/tex]
materials that match the density: gold
Related Questions
What are the most common metric units used in science?
Answers
Answer its a
Explanation:
In the bicarbonate buffering system, carbon dioxide and water join to form ___________, which dissociates into hydrogen and ________________.
Answers
In the bicarbonate buffering system, carbon dioxide and water join to form carbonic acid, which dissociates into hydrogen and bicarbonate.
A buffer solution resists the changes in acidity by combining with the hydrogen ions that were added and inactivates them. It is a solution of weak acid and its conjugate base, (carbonic acid and bicarbonate). The natural conversion of carbon dioxide into carbonic acid is slow.
Bicarbonate buffer absorbs hydrogen ions and forms carbonic acid. The total number of hydrogen ions and hence the pH of the solution does not change. Bicarbonate is consumed and carbonic acid is produced when hydrogen ions are added.
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\identify which reaction is likely to have the greatest positive enthalpy change. p(g) 5cl(g)→pcl5(g) p(g) 3cl(g)→pcl3(g) pcl3(g)→p(g) 3cl(g) pcl5(g)→p(g) 5cl(g)
Answers
The greatest positive enthalpy change has PCl₅(g) → P(g) + 5Cl(g)
An enthalpy change is difference between the enthalpy after the chemical reaction has completed.
An enthalpy change of phosphorus(V) chloride (PCl₅) molecule is energy needed for breaking up one molecule of phosphorus(V) chloride into one phosphorus and five chlorine atoms.
In a chemical reaction, chemical bonds are forming and breaking and this cause the transformation of one group of chemical substances to another.
Energy is needed to break chemical bonds in molecules (positive enthalpy change), while during formation of molecule, energy is released (negative enthalpy change)
The stronger are the bonds, more energy is needed and enthalpy change is more positive.
PCl₅ has more bonds to break than PCl₃.
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A cup of coffee(140g) cools from 75 degrees Celsius down to comfortable room temperature 20 degrees Celsius. How much energy does it release to the surroundings.
Answers
Energy releases to the surroundings = -32.2 kJ
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
mass of coffee(m) = 140 g
∆T = temperature difference :
final temperature - initial temperature = 20-75=-55°C
specific heat coffee= specific heat water = 4.18 J/g° C
The heat releases :
[tex]\tt Q=140\times 4.18\times -55\\\\Q=-32186~J\approx -32.2~kJ[/tex]
MY ELEMENT IS RHENIUM
1. Summarize the physical and chemical properties of the element you selected.
2. In the lesson, many models were used to depict the atom. How did these models help you understand atomic structure?
3. How do protons, neutrons, and electrons differ in terms of their electrical charges and locations within the atom?
4. Describe the four fundamental forces. Which of these forces are involved in chemical bonding?
Please answer these questions or at least one.
Answers
The element Rhenium is an inner transition element having 75 electrons, 75 protons and 111 neutrons.
What is rhenium?The element rhenium is one of the elements that belongs to the inner transition series. The element is known to have total 75 electrons, 75 protons and 111 neutrons. The relative atomic mass of the element have been placed at 186 g/mol.
The element is known to be massive and does form very massive complexes. The complexes of rhenium are very useful in industry. The models of the atom have helped to show the arrangement of the electrons, protons and neutrons in the element.
The protons are positively charged and they are found in the nucleus while the electrons are found shells and are negatively charged. The neutrons in the atom have no charge.
The four fundamental forces are metallic forces that holds atoms of metals together. The ionic bond that holds ions together, the covalent bond that holds atoms together in molecules and the dative bonds that leads to the formation of coordinate compounds.
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What is the difference between atomic elements and molecular elements?
Answers
An atomic element is the subject in the formula such as ... sulfur, carbon, or oxygen
what is the mass of 1.20 x 10^25 atoms of He
Answers
Answer:
79.7 g He
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
1.20 × 10²⁵ atoms He
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of He - 4.00 g/mol
Step 3: Convert
[tex]1.20 \cdot 10^{25} \ atoms \ He(\frac{1 \ mol \ He}{6.022 \cdot 10^{23} \ atoms \ He} )(\frac{4.00 \ g \ He}{1 \ mol \ He} )[/tex] = 79.7077 g He
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
79.7077 g He ≈ 79.7 g He
If you wanted to take a solid nugget of silver and make it flow so that it can be shaped, how could you do it? you could...
Answers
Answer:
It should be heated
Explanation:
To change the solid nugget of silver to liquid so that it can be shaped, the solid mass should be heated to the melting point.
This change is a phase change from solid to liquidWhen the melting point of a substance is reached, the fixed lattice structure collapses. This allows for the particles to slide and flow relative to one another.Therefore a phase change from solid to liquid is attained by heating of the solid to melting point.
WILL GIVE BRAINLIEST ANSWER!!!
I have 345 mL of a 1.50 M NaCl solution. If I boil the water until the volume of the solution is 250. mL, what will the molarity of the solution be?
Answers
Answer: 2.07 M
Explanation:
(1.5m) (345ml)
---------------------
250 ML = 2.07M
Based on the information in the passage,
what can be determined about carbon as
a gas, liquid, and solid?
All three can be captured from fossil fuel
emissions.
Each one causes a negative chemical reaction in
other substances.
All three can be disposed of in ocean water for safe
storage.
Each one takes up a different amount of physical
space.
Answers
A gas, liquid, and solid can all be captured from fossil fuel emissions.
What is fossil fuel?
The term fossil fuel refers to the kind of fuel that is obtained from carbonaceous materials. This is the kind of material that serves as a source of energy for automobiles and for heating. It could also be used in the production of electricity.
The burning of fossil fuels leads to the emission of carbon which hurts the environment. Thus, from the passage, we can deduce the a gas, liquid, and solid can all be captured from fossil fuel emissions.
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What happens when a wave hits an object?
the wave is reflected
the wave continues on
the wave is interfered with
the wave stops
Answers
Answer:
the wave is reflected. it starts heading towards the other direction
Explanation:
When Philip analyzed unknown substance x, he found that it contained only one kind of atom what is substance x
Answers
Explanation:
A compound consists of either many identical atoms or more than 1 type of atom. They can be broken down or converted into a simpler one.
An element is a substance which contains only one kind of atom. It cannot be broken down further or converted into simpler substance by any chemical means.
Heterogeneous mixture is a non uniform mixture of different atoms without any chemical bonding in between them.
Homogeneous mixture is a uniform mixture of different atoms without any chemical bonding in between them.
From the definitions it is clear that substance X is (B) Element.
Please help me with this question please.....
Answers
Answer:
gain electrons
Explanation:
"atoms gain electrons, they acquire a negative charge "
15. What is the wavelength of a 1.32 x 10^-6 eV wave?
Answers
The wavelength of a 1.32 x 10-⁶ eV wave is 0.939m or 9.39 × 10⁸nm.
How to calculate wavelength?The wavelength of a wave can be calculated using the following formula:
wavelength = speed ÷ frequency
However, the frequency of the wave needs to be calculated first using the formula as follows:
E = hf
Where;
E = energy of the waveh = Planck's constant (6.626 × 10-³⁴J/s)f = frequency1 electronvolt = 1.602 × 10-19 joule
Hence, 1.32 × 10-⁶ eV is equivalent to 2.11487 × 10-²⁵J.
2.11487 × 10-²⁵J = 6.626 × 10-³⁴ × f
f = 2.11487 × 10-²⁵ ÷ 6.626 × 10-³⁴
f = 3.2 × 10⁸Hz
Wavelength = 3 × 10⁸ ÷ 3.2 × 10⁸
Wavelength = 0.9375 × 10⁰
Wavelength = 0.94m
Therefore, the wavelength of a 1.32 x 10-⁶ eV wave is 0.939m.
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Which statement best explains why an object appears green in sunlight?
The object absorbs most white light and refracts most green light.
The object refracts most white light and absorbs most green light.
More green light is absorbed while more red and blue light is reflected.
More green light is reflected while more red and blue light is absorbed
Answers
Answer:
b i think because i think so
To verify the law of Conservation of mass in a chemical reaction.
Write the formulae of the following-
a) Magnesium hydroxide
b) Hydrogen sulphide
c) Calcium oxide
d) Barium chloride
e) Sodium carbonate
f) Ammonium sulphate
g) Aluminium oxide
h) Magnesium bicarbonate
i) Aluminium phosphate
j) Silver nitrate
Answers
Answer:
To verify the law of Conservation of mass in a chemical reaction.
Write the formulae of the following-
a) Magnesium hydroxide
b) Hydrogen sulphide
c) Calcium oxide
d) Barium chloride
e) Sodium carbonate
f) Ammonium sulphate
g) Aluminium oxide
h) Magnesium bicarbonate
i) Aluminium phosphate
j) Silver nitrate
how long did it take for a car to travel 20 meters with a speed of 10m/s
Answers
Answer:
2 second
Explanation:
yes
How do two nonmetal atoms become more stable and form
compounds?
A) sharing valence electrons
B) Nonmetal atoms do not make compounds with
each other
C) fusing nuclei
D) permanently transferring electrons
Check it
Answers
Two non-metals become more stable by sharing valence electrons and forming covalent compounds.
What is covalent compound?
Covalent compound is defined as a type of compound which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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PLEASE HELP QUICK Lab - Limiting Reactant and Percent Yield
Data (Trial 1) (5 Points)
Observations during Reaction:
3CuCl2(aq) + 2Al(s) → 3Cu(s) +2AlCl3(aq)
Measured Mass (g)
N/A
N/A
Molar Mass ( )
134.45
26.98
N/A
N/A
Actual Moles (mol)
N/A
N/A
Analysis: The limiting reactant is _ because . . .
Data (Trial 2) (5 Points)
Observations during Reaction:
3CuCl2(aq) + 2Al(s) → 3Cu(s) +2AlCl3(aq)
Measured Mass (g)
Filter paper alone Filter paper + Cu
Cu alone
N/A
Molar Mass ( )
134.45
26.98
63.55
N/A
Actual Moles (mol)
N/A
Analysis: The limiting reactant is _ because . . .
Theoretical yield of copper based on the limiting reactant; (insert the answer from above)
_ _: _ _ moles = _ g
Percent yield: _ _%
Limiting Reactant and Percent Yield - Lab Report
Purpose (5 Points)
Hypothesis (5 Points)
Analysis
(5 Points) If you put a piece of zinc into a solution of copper (I) sulfate and allow the single replacement reaction to go to completion, how will you know which of the reactants is the limiting reactant? Write the balanced equation, including the states of matter of the reactants and products, to help support your answer.
CuSO4(___) + Zn (__) → Cu(__) + ZnSO4 (___)
Is it balanced? __________ If not, fix it.
(5 Points) What is the difference in actual yield and theoretical yield?
Solid Silicon can be reacted with Nitrogen gas at a high temperature to form silicon nitride (Si3N4).
1.20 moles of Silicon are added to 1.00 moles of Nitrogen gas.
(5 Points) Balance the equation and indicate the phases.
Si (___) + N2 (___) → Si3N4 (___)
(5 Points) What is the limiting reactant? You must show your work.
(5 Points) How many moles of silicon nitride will be made? You must show your work.
(5 Points) What is the benefit of having a limiting reactant in a reaction?
(5 Points) In a manufacturing process why would you prefer not to have a limiting reactant?
(5 Points) Can you tell from the masses of the reactants which one of the reactants will be the limiting reactant? Defend your answer (use an equation within your defense).
4.95 g of ethylene (C2H4) are combusted with 3.25 g of oxygen.
(5 Points) Balance the equation. (ethylene plus oxygen yields carbon dioxide and water)
C2H4 + O2 → CO2 + H2O
(5 Points) What is the limiting reactant? You must show your work.
(5 Points) If the actual yield of Carbon dioxide is 2.50 g, what is the percent yield for the reaction? You must show your work.
Silver nitrate reacts with iron (III) chloride to give silver chloride and ferric nitrate. In a particular experiment, it was planned to mix a solution containing 25.0 g of silver nitrate with another solution containing 45.0 grams of iron (III) chloride.
(5 Points) Balance the equation.
AgNO3 + FeCl3 → AgCl + Fe(NO3)3
(5 Points) What is the limiting reactant? You must show your work.
(5 Points) What is the theoretical yield of grams of AgCl that could be obtained? You must show your work.
(10 Points) When 56.6 g of solid calcium and 30.5 g of nitrogen gas undergo a reaction that has a 93.0% yield, what mass of calcium nitride forms? Make sure you balance the equation to help solve the question and show all of your work.
Ca(s) + N2 (g) → Ca3N2 (s)
Answers
Answer:
im stuck on it too unfortunatley
Explanation:
60 POINTS! PLEASE ANSWER!
Answers
Which substance is considered to be neutral on the pH Scale? *
2 points
battery acid
pure water
bleach
ocean water
Answers
Answer:
Pure Water
Explanation:
Battery acid is well and acid
Bleach is a base
Ocean water is impure so it could lean either way
i need help with the one that asks what a genotype is and phenotype and how they are related i’ll give brainliest on whoever is right
Answers
Answer:
See the answer below
Explanation:
Genotype refers to the genetic composition of a trait while phenotype refers to the physical representation of a trait in relation to the environment. The genotype of a trait' or of an organism largely determines how the trait would be physically expressed, barring some environmental influence. It gives instructions on how a trait is physically represented.
calculate the percentage of iron in iron (III) sulphate
Answers
Answer:
28.01 percent
Explanation:
Iron (III) sulphate, [tex]Fe_2(SO_4)_3[/tex], has 2 atoms of Fe.
One atom of Fe has a molar weight of 56. Hence, 2 atoms of Fe would have a total molar weight of 56 x 2 = 112 g/mol
Molar weight of [tex]Fe_2(SO_4)_3[/tex] = 399.88 g/mol
Percentage Fe in [tex]Fe_2(SO_4)_3[/tex] = 112/399.88 x 100%
= 28.01%
The percentage of iron is iron (III) sulphate is, therefore, 28.01 percent.
Which of the following is NOT one of the four pieces of evidence Wegener
used to validate his continental drift hypothesis?
Current global warming trends
O Apparent fit of the continents as a "puzzle"
O Past climate of the Earth seen in glaciers
O Correlation of fossils
Correlation of rocks and mountains
Answers
Willie has fewer than normal bacteria in his gut microbiome. How will this affect his health?
Answers
Answer:
Indegestion I believe as there isn't as much bacteria to break down his food.
Explanation:
Tbh, dont complain if you don't like a food, because when you chew it, its gonna turn into some white mush anyways, and when it comes out, its brown.
Dont blame me, blame your tooth.
Christopher berg land holds the world record for most distance run on a treadmill in day. He ran 247.54 km. How many miles per hour did Chris have to run to accomplish this?
note: Can you please explain how to do this and not just give the answer?
Answers
Answer:
6.408924056 miles/hour.
Explanation:
First we have to convert 247.54 km to miles. The conversion factor will be 1 km = 0.621371 miles. To do this I set up my stoichiometry.
247.54km | 0.621371miles = 153.8141773 miles
| 1 km
Now we have 153.8141773 miles per 1 day. The conversion factor will be 1 day = 24 hours.
153.8141773 miles | 1 day 6.408924056 miles/hour.
1 day | 24 hours
(if you need to know what I did with the stoichiometry just ask! I'll be happy to help!)
One difference between molecular formula and molecular weight.
Answers
Answer: The formula mass (formula weight) of a molecule is the sum of the atomic weights of the atoms in its empirical formula. The molecular mass (molecular weight) of a molecule is its average mass as calculated by adding together the atomic weights of the atoms in the molecular formula.
Hope this helps.... Stay safe and have a great weekend!!!!! :D
What is a formula unit in an iconic bond
Answers
Answer:
A formula unit indicates the lowest whole number ratio of ions in an ionic compound. Because the positively and negatively charged ions in an ionic compound are arranged in a crystal lattice, there is no discrete particle comparable to a molecule.
Explanation:
Answer:
A formula unit in chemistry is the empirical formula of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations. ... Ionic compounds do not exist as individual molecules; a formula unit thus indicates the lowest reduced ratio of ions in the compound.
Explanation:
The Transfer of energy from one object to another through direct contact
Answers
Answer:
Conduction
Explanation:
Conduction is the transfer of energy from one molecule to another by direct contact.
A theory has enough scientific support to be solidly accepted in the scientific community.
a.
A theory can be disproven.
b.
With further testing, a theory can become a law.
c.
A theory has enough scientific support to be solidly accepted in the scientific community.
d.
A theory explains why or how a phenomenon occurs.
e.
More than one of the four statements is false.
Answers
All the options from a) to d) are correct. Theory is a principle which explains a particular subject, or provides us with a general idea relating to it.
A theory can be disproven too if the stated principle or phenomenon does not fit with the explanation given by the theory. If a theory is accepted universally and tested properly, it can become a law too. A theory can be accepted or even rejected in a scientific community.
A theory can be modified overtime if more accurate predictions are given related to it, is based on facts, ideas and hypotheses.
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