The mass of an unidentified rock is 40 grams. Students determine the volume of the rock by placing the rock in a cylinder with water. The students calculate the density of the rock. They determine the identity of the rock based on the density ranges in the table.
Answers
Answer:
A. Coal
Explanation:
[tex] Volume_{rock} [/tex] = water displaced by rock
Water displaced by rock = volume of water after rock is dropped into the cylinder - volume of water before the rock was dropped into the water
Water displaced by the rock = 180 ml - 150 ml = 30 ml
[tex] Volume_{rock} = 30 ml [/tex]
Density of rock:
40 grams => 30 ml
x grams => 1 ml
Cross multiply
1*40 = 30*x
40 = 30x
40/30 = 30x/30
1.3 = x
Density of rock = 1.3 g per 1 ml
Recall: 1 ml = 1 cm³
Therefore,
Density of the rock = 1.3 g/cm³
1.3 g/cm³ falls within the range of 1.1 - 1.4 g/cm³
Therefore, the rock is identified as Coal.
Related Questions
What is the molar mass of silver (Ag)?
Answers
Answer:
should be 107.8682u
Explanation:
Answer:
C. 107.87 g/mol
Explanation:
I got it right
Calculate the mass of 20 moles of Fe
Answers
Answer:
1116.9g
Explanation:
The mass of 20 moles of Fe is 1116.9 g or 1117 g/mol.
Calculation,
The mass of one mole of [tex]Fe[/tex] = 55.85 g/mol
Mass of 20 moles of [tex]Fe[/tex] = 20×55.85 g/mol
Mass of 20 moles of [tex]Fe[/tex] = 1116.9 g ≈ 1117 g/mol
What is molar mass ?The mass of the one mole of the substance (atom) is called molar mass.
Example: The molar mass of [tex]Fe[/tex] is 55.85 g/mol
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can you help again
will be the brainiest
Answers
Answer:
B
Explanation:
The molecular weight of Magnesium Sulphate
Answers
Melting point: 2,055°F (1,124°C)
Formula: MgSO4
Density: 2.66 g/cm³
The outer shell of this element was determined as illustrated here. It must be a _____.
: light metal
: heavy metal
: non metal
: noble gas
Answers
The outer shell of the given element was determined as illustrated must be a noble gas. Therefore, option D is correct.
What are noble gases?Noble gases can be described as the 6 elements that are organized in group 18 of the modern periodic table. The noble gases are Helium, Neon, Argon, Krypton, Xenon, and Radon.
Under standard temperature and pressure, noble gases exist in the gaseous form and possess low reactivity. Therefore, noble gases are also referred to as inert gas. All the noble gases exhibit stable electronic configurations in their valence shell that are completely filled. Noble gases generally exist as monoatomic.
The general outer configuration of the noble gases can be written as ns²np⁶, n is the principal quantum number. Therefore, the given electron dot diagram has eight electrons in its valence shell so it is representing a noble gas.
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Catalysts are ______ that increase the rate of a chemical reaction
Answers
Answer: substance reactions
Explanation:
HELP PLZ MUCHO HELP I WILL GIVE BRAINLIEST IF CORRECT PLEASE NEED HELP
Answers
Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory? higher temperature Right arrow more kinetic energy Right arrow more space between particles Right arrow higher volume higher temperature Right arrow less kinetic energy Right arrow less space between particles Right arrow higher volume higher temperature Right arrow more kinetic energy Right arrow less space between particles Right arrow lower volume higher temperature Right arrow less kinetic energy Right arrow more space between particles Right arrow lower volume
Answers
Answer:
higher temperature → more kinetic energy → more space between particles higher volume
Explanation:
Kinetic Molecular Theory states that gas particles exhibit perfectly elastic collisions and remain in constant motion. Absolute temperature is directly proportional to the average kinetic energy of gas particles.
The following sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory:
higher temperature → more kinetic energy → more space between particles higher volume
can you hellp me plez
Answers
Answer:
srry, I don't understand, I would need more info
The density of silver is 10.49 g/cm^3. Find the volume of a piece of silver with a mass of 31.5 grams.
Answers
Answer:
The answer is 3.00 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass of metal = 31.5 g
density = 10.49 g/cm³
We have
[tex]density = \frac{31.5}{10.49} \\ = 3.002859866...[/tex]
We have the final answer as
3.00 cm³Hope this helps you
One isotope of carbon has 6 protons and 6 neutrons. The number of protons and neutrons of a second isotope of carbon would be _____.
a. 7 and 6
b. 7 and 7
c. 6 and 6
d. 6 and 7
Answers
As proton remains constant
Explanation
Graphing data can help you to recognize
Answers
Answer:
Graphing data can help you to recognize changes in what your doing.
Explanation:
Answer:
Explanation:
To identify trends, make predictions, and recognize anomalous data. Helps you understand what your data means or a picture of your graph. A graph wich the points form a straight line.
When an electron in an atom moves from a higher, less stable level, down to a lower, more stable level, a photon is
A)
created.
B)
emitted.
C)
absorbed.
D)
destroyed.
Answers
Answer:
Emitted
Explanation:
Answer:
B. emitted.
Explanation:
In this reaction, how many moles of CO2 would be produced when methane (CHA) fully reacts with 6 moles of Oz? CH4 + 202 2H2O + CO2
O A. 12
O B. 6
O C. 3
O D. 2
WILL GIVE BRAINLEST!
Answers
In this reaction, 3 moles of CO2 would be produced when methane (CHA) fully reacts with 6 moles of Oz.
What is methane used for?Methane is an odorless, colorless, flammable gas. Its miles are used ordinarily as gasoline to make heat and light. it is also used to fabricate natural chemicals. Methane can be fashioned by way of the decay of natural substances and is common in landfills, marshes, septic structures, and sewers.
Is methane gas harmful to human beings?High tiers of methane can lessen the quantity of oxygen breathed from the air. this can result in temper changes, slurred speech, vision problems, memory loss, nausea, vomiting, facial flushing, and headache. In excessive cases, there can be changes in respiratory and coronary heart fee, balance problems, numbness, and unconsciousness.
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Many people like the idea of using windmill farms, but they do not want the power plants near their homes. What is the most likely reason that people do not want to live near wind power plants? They are concerned about being exposed to air pollution. They are worried that wind near their homes will be used up. They think the increased operating costs will increase their electric bills. They do not want to live near towers that transfer electricity.
Answers
Answer:
d.They do not want to live near towers that transfer electricity
Explanation:
A satellite in orbit maintains a constant speed while orbiting around the earth.
Newton's 1st Law
Newton's 2nd Law
Newton's 3 Law
Law of Universal Gravitation
Law of Conservation of Momentum
Answers
Answer:
Newton's 2nd Law
Explanation:
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
Chlorine has an atomic number of 17.
How many protons are in an atom of chlorine?
17
18
35
52
Answers
Explanation:
The protons are in an atom of chlorine is also 17. So , mark this answer as BRAINLIEST answer.Thank you ☺️☺️
The isotopes of Madeupium (Ma) and their abundance in nature are shown below. Which is the most likely estimate of what the atomic mass is close to?
Ma-74 (74.333 - 85%)
Ma-75 (74.999 - 10%)
Ma-76 (75.700 - 5%)
A. 74 g
B. 75 g
C. 76 g
Answers
Answer:
A = 74 g
Explanation:
Given data:
Ma-74 (74.333 - 85%)
Ma-75 (74.999 - 10%)
Ma-76 (75.700 - 5%)
Atomic mass close to = ?
Solution:
1st of all we will calculate the average atomic mass.
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass = (85×74.333)+(10×74.999)+(5×75.700) /100
Average atomic mass = 6318.305 +749.99+ 378.5 / 100
Average atomic mass= 7446.795/ 100
Average atomic mass = 74.467 amu
The average atomic mass is closer to the 74 g.
PLEASE HELP the density of aluminum foil is 0.789g/cm3. Calculate the mass of 10.0cm3 of aluminum foil.
Answers
Answer:
100.985
Explanation:
Which term describes the materials magma is made of?
cooled
molten
extrusive
intrusive
Answers
Answer:
The correct answer is Molten
Explanation: The proof is in the attachment below, the answer is correct on the quiz I took
The term molten describes the materials magma is made up. Thus, option B is correct.
What is element?
Silver is a shiny metal that conducts electricity very well . It can be molded into thin sheets it means it can spread into a like a sheet and these type of properties is known as malleability.
Potassium is dull and brittle it means that it can't be change into sheet when you try to change in sheet it will break and these properties are called as brittlness and when it is has been dissolved into water, which it does quite easily. Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting points and boiling points.
Carbon is an element which is a chemical by nature and it is represented by C and the atomic number of carbon is 6. The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .
Therefore,the term molten describes the materials magma is made up. Thus, option B is correct.
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ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
What did J.J. Thomson's cathode-ray tube experiment show?
Atoms are small individual spheres.
Electrons are in a cloud surrounding positively charged particles.
Atoms consist of at least some negatively charged particles.
Matter can be neither created nor destroyed.
Answers
Answer:
Atoms consist of at least some negatively charged particles (Electron)
Explanation:
J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons.
Please correct me if I'm wrong.
1. A sample of a hydrocarbon is burned completely
and produces 22 g of CO2 and 27.0 g of H2O. The
empirical formula of the hydrocarbon is:
Answers
Will give brainliest if solved.
Answers
option 4
hope this helped
4.564000 x 10^-4 express how many significant figures
Answers
Answer: 7
Explanation:
Before a number but after a decimal. The zeros at the end would usually mean that it doesn't count but since the numbers are before the zeros and after a decimal it's 7 sig figs
Definition of volume
Answers
Answer:
The amount of space an object occupies.
Explanation:
Antibiotics do not reduce the number of helpful and harmful bacteria in the microbiome.
O True
O False
Answers
Answer:
false; the purpose of antibiotics is to kill bacteria
Explanation:
It is true, it does reduce the number in both categories.
What are the 6 types of chemical reactions?
Answers
Answer:
Explanation:
Six common types of chemical reactions are: synthesis, decomposition, single-displacement, double-displacement, combustion and acid-base reactions .
Chemical reactions can be classified into six main types based on their characteristics. The six types of chemical reactions are Combination (Synthesis) Reaction, Decomposition Reaction, Displacement (Single Replacement) Reaction, Double Displacement (Double Replacement) Reaction, Combustion Reaction, and Redox (Oxidation-Reduction) Reaction.
Combination reactions involve the union of two or more substances to form a more complex compound. Decomposition reactions involve the breakdown of a single compound into simpler substances.
Displacement reactions occur when an element displaces another element in a compound, resulting in the formation of a new compound and a different element. Double displacement reactions involve the exchange of ions between two compounds, leading to the formation of two new compounds.
Combustion reactions occur when a substance reacts rapidly with oxygen, producing heat and light. Understanding these different types of chemical reactions helps in predicting and understanding the behavior of substances during chemical transformations.
Therefore, the six types of chemical reactions are Combination (Synthesis) Reaction, Decomposition Reaction, Displacement (Single Replacement) Reaction, Double Displacement (Double Replacement) Reaction, Combustion Reaction, and Redox (Oxidation-Reduction) Reaction.
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The mass of a solid is 6.75 g and its volume is
3.5 cm. What is the density of the solid?
Answers
Answer:
1.93 (rounded to nearest .00)
Explanation:
[tex]\frac{M}{V}[/tex] (mass divided by volume)
Name and describe the chemical models scientists use to make predictions.
Answers
? Question
Match the scientists to their contributions to the development of the periodic table.
Drag the tiles to the correct boxes to complete the pairs.
Answers
Answer:
Proposed a periodic table that accommodated for the discovery of new elements, Dmitri Mendeleev
Proposed a triad arrangement based on the elements’ physical and chemical similarities Johann Döbereiner
Proposed a periodic table based in the repeating properties of the elements like an octave in music. John Newlands
Proper a periodic table based on the increasing order of the elements atomic numbers. Henry Moseley
Explanation: I did the same thing
Answer:
The first one is:Dmitri Mendeleev
second one is:Johann Döbereiner
third one is:John Newland
fourth one is:Henry Moseley