Answers
Answer:
The answer is B
Explanation: Minerals have no magnetism. Basically magnetism is the physical property of the minerals.
Related Questions
HELLP ME PLSSS
The passing of heat through a material is called ________.
A. vibration
B. conduction
C. radiation
D. convectio
Answers
Answer:
B
Explanation:
conduction is the transfer of heat between objects that touch
(1.6): What volume of oxygen, at 18°C and 750 torr, can be
obtained from heating 100gm of potassium chlorate, KCIO,?
Answers
Answer:
Volume of oxygen obtained = 30 L
Explanation:
Given data:
Mass of KClO₃ = 100 g
Pressure = 750 torr = 750/760 = 0.98 atm
Temperature = 18°C = 18+273 = 291 K
Volume of oxygen obtained = ?
Solution:
Chemical equation:
2KClO₃ → 3O₂ + 2KCl
Number of moles of KClO₃:
Number of moles = mass/molar mass
Number of moles = 100 g/ 122.55 g/mol
Number of moles = 0.82 mol
Now we will compare the moles of KClO₃ with oxygen.
KClO₃ : O₂
2 : 3
0.82 : 3/2×0.82 = 1.23 mol
Volume of oxygen:
PV = nRT
0.98 atm × V = 1.23 mol ×0.0821 atm.L/mol.K × 291 K
0.98 atm × V = 29.4 atm.L
V = 29.4 atm.L /0.98 atm
V = 30 L
If 32.15 mL of a 0.1126 M HCl(aq) solution is used to titrate 14.78 mL of aNa2CO3(aq) solution, what is the molarity of the sodium carbonatesolution according to this equation: 2HCL+Na2CO3—->CO2+H2O+2NaCl
Answers
The reaction here is:
2HCL + Na2CO3 => CO2+ H2O+ 2NaCl (it is used for another way to solve the exercise)
To find the molarity of Na2CO3, we will use the next equation:
M1 x V1 = M2 x V2 (1)
1 is for HCl
2 is for Na2CO3
M for molarity and V for volume
Procedure:
We need to clear M2 from (1):
M1 x V1/V2 = M2
0.1126 M x 32.15 mL/14.78 mL = 0.2449 M = M2
Answer: M2 = 0.2449 M
Which one of the following statements a about scientific hypothesis is FALSE? A scientific hypothesis is an educated guess about why something happens. In order to be useful, a scientific hypothesis must be testable in a way that is replicable by other scientists. The previously known outcome of an observation or experiment can be used as solid proof that a newly-created scientific hypothesis is absolutely true. A scientific hypothesis is an explanation for a natural phenomenon.
Answers
Answer:
C). The previously known outcome of an observation or experiment can be used as solid proof that a newly-created scientific hypothesis is absolutely true.
Explanation:
A Scientific hypothesis is characterized as the proposed explanation or an educated guess about a natural phenomenon on the basis of previous knowledge as well as observation. All the given statements are true regarding a scientific hypothesis that it is 'an educated guess which explains the reason why a specific phenomenon occurs', 'being testable in a manner that could be replicated by other', 'an explanation for a natural phenomenon' except for that the 'truth of a scientific hypothesis can never be assured completely with a solid proof as it always has chances of being expanded.' Thus, option C is the correct answer.
How would the addition of protons affect the concentration of CH3COOH? How would the addition of OH– affect the amount of CH3COOH present? How would the addition of CH3COO– affect the concentration of protons? What would happen to [H+] if [CH3COOH] were increased?
Answers
Answer:
1) increase concentration
2) decrease the amount
3) decrease the concentration
4) it would increase
Explanation: edge 2021
Answer:
1) increase concentration
2) decrease the amount
3) decrease the concentration
4) it would increase
Explanation:
6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
Round 9.9100881 × 101 to 6 significant digits in decimal form.
Answers
Answer:
Round to six significant = 1000.92
Explanation:
Given data:
Given value = 9.9100881×101
Round given value to six significant figures
Solution:
Significant figures:
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
How to round the digits:
First we will look at the six digit of given values.
we will draw a line after six digit then we will look the digit after line.
It the digit after line which is 7th digit is 5 or more than 5 then one will be added to the six digit.
If it it is less than five then six digit remain same.
After this we will add zeros to the right till decimal point.
In given measurement:
9.9100881×101 = 1000.9188981
1000.9188981
Six digit is 1 and 7th is 8 thus 1 is converted into 2.
Round to six significant = 1000.92
CAN SOMEONE HELP WITH THIS QUESTION?
Answers
The usual enthalpy change for the 200g/7.68 mol of ethyne reaction is C2H6g C2H2g Plus 2H2g - 2,388.5kJ.
What does the letter H mean for chemistry?The quantity of heat released or absorbed during a reaction occurring at constant pressure is known as the enthalpy change.
In thermodynamics, what does H mean?H stands for "enthalpy change," Hf for "system final enthalpy" (i.e., the enthalpy of the byproducts of the system in equilibrium in a chemical reaction), and Hi for "system initial enthalpy" (i.e., the entropy for the reactants in a chemical reaction).
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(5x10^3) + (4.3x10^4)=
Answers
Answer:
48000
Explanation:
maths
Answer:
48000
Explanation:
(5x10^3) = 5 × 1000 = 5000
(4.3x10^4) = 4.3 × 10000 = 43000
5000 + 43000 = 48000
Which of the following elements is the most reactive?
a
Beryllium
b
Calcium
c
Magnesium
d
Barium
Answers
Explanation:
The answer would be Berium because it can mix as well with other elements in the periodic table.
Barium is regarded as the most reactive elements out of all the options
provided.
Barium is an element with symbol Ba and atomic number 56. It belongs to
Group 2 metals whose reactivity increases as we go down the group.
The alkaline earth metals which are in Group 2 of the Periodic Table include
: beryllium, magnesium, calcium, strontium, barium, and radium
The increase in reactivity down the group is as a result of the decreasing
ionization energy required to form new compounds. The Ionization energy
decreases due to more inner shells and increase in distance from the
nucleus.
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CS₂(l) + 3O₂(g) → CO₂(g) + 2SO₂(g) 13. What volume of O₂(g) is required to react with excess CS₂(l) to produce 4.0 L of CO₂(g)? (Assume all gases are measured at 0°C and 1 atm.)
Answers
The volume of a substance at STP for one mole is 22.4 L. The volume of oxygen required to react with excess of carbon sulphide to produce 4 L of carbon dioxide 4.0 L is 12 L.
What is volume?Volume of a substance is the space occupied by the particles of the substance. As the temperature increase, volume also increases. The volume of one mole of every substance at standard temperature and pressure is 22.41 L
According the balanced reaction given, 3 moles of O₂ is required to produce one mole carbon dioxide. One mole of O₂ is 22.4 L. Thus volume of 3 moles of oxygen is calculated as follows:
Volume of O₂= 3×22.41 =67.2 L.
Thus, 67.2 L of O₂ produces one mole or 22.4 L of carbon dioxide.
The volume O₂ required to produce 4 L of carbon dioxide is calculated as follows:
Volume of O₂ = (67.2 L × 4 L) / 22.41 L
= 12 L.
Therefore, the volume of oxygen molecule required to produce 4 L of carbon dioxide on the reaction with excess of carbon sulphide is 12 L.
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Propane has a boiling point of (-42.0ºC ) What is this temperature equivalent to Kelvins Show calculations.
Answers
Step 1 - Understanding how to convert Celsius to Kelvin
Kelvin is called the absolute temperature because its zero is based on the complete absence of molecular motion (which is possible in theory, but quite impossible to reach experimentally).
The temperature in Kelvin is related to the temperature in Celsius by the following expression:
\(T(K)=T(\degree C)+273.15\)That is, to obtain the temperature in Kelvin, we just need to add 273.15 to the temperature in Celsius.
Step 2 - Using the expression to solve the exercise
The boiling point of propane is -42.0°C. Note that this is our T(°C). To obtain T(K) let's plug the value in the equation:
\(T(K)=-42.0+273.15=231.15K\)The equivalent temperature in Kelvin would be thus 231.15 K.
3 H2S + 2AuCl --> Au2S3 + 6 HCL is what type
of reaction
Answers
Answer:
Double Displacement (Metathesis)
Explanation:
What was the purpose of the experiment of cellular respiration
Answers
Answer:
Cellular respiration is used to create usable energy from the foods that living things eat. It's important to know that the reactions involved in cellular respiration are catabolic, meaning they break down molecules into smaller ones. This differs from anabolic reactions, which build bigger molecules from smaller ones
If silver crystallizes in a FCC unit cell and has a density of 10.6 g/cm3 what is the atomic radius of Silver?
Answers
As a result, the silver atomic radius in an FCC crystal lattice is roughly 1.44 angstroms.
What is the FCC crystal structure's atom count per unit cell?There are 6 atoms in each unit cell of the hexagonal closest packed (HCP), which has a coordination number of 12. Four atoms make up each unit cell of the face-centered cubic (FCC), which has a coordination number of 12.
The following equation can be used to connect the silver crystal's density to its atomic radius (r) and molar mass (M):
density = (4 x M) / [(a)³ x Avogadro's number]
For FCC unit cells, the length of one edge (a) is related to the atomic radius (r) by the following equation: a = 2^(1/2) * r
Substituting this expression for a into the density equation and solving for r, we get:
r = [(3 x M) / (32 x density x pi)]^(1/3)
where pi is the mathematical constant, pi.
The molar mass of silver is approximately 107.87 g/mol.
Substituting the given values into the equation, we get:
r = [(3 x 107.87 g/mol) / (32 x 10.6 g/cm³ x pi)]^(1/3)
= 1.44 angstroms (rounded to two significant figures)
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Question 4:
1. Suppose a 70-kg individual drinks 2 L/day of water containing 0.1
mg/L of 1,1-dichloroethylene for 20 years.
(a) Find the hazard quotient for this exposure.
(b) Find the cancer risk.
(c) If the individual drinks this water for 30 years instead of just 20,
recompute the hazard quotient and the cancer risk.
Answers
(a) The hazard quotient is:
HQ = Intake / RfD = 0.0002 mg/day / 0.02 mg/kg/day = 0.01
(b) The cancer risk is 1 in 10,000.
(c) The cancer risk is 1 in 1,000.
What is Hazard quotient?Hazard quotient (HQ) is a measure used in risk assessment to evaluate the potential health risk posed by exposure to a chemical or other hazard. It is calculated as the ratio of the dose or exposure level of the chemical to a reference dose (RfD) or reference concentration (RfC) established by regulatory agencies or scientific bodies as a safe level of exposure. If the hazard quotient is greater than 1, it suggests that the level of exposure is of potential concern and additional risk assessment may be needed.
(a) The hazard quotient (HQ) is calculated as the daily intake of a chemical divided by its reference dose (RfD). The RfD for 1,1-dichloroethylene is 0.02 mg/kg/day.
The daily intake of 1,1-dichloroethylene can be calculated as:
Intake = concentration × ingestion rate × body weight
Intake = 0.1 μg/L × 2 L/day × 70 kg = 14 μg/day = 0.0002 mg/day
The hazard quotient is:
HQ = Intake / RfD = 0.0002 mg/day / 0.02 mg/kg/day = 0.01
(b) The cancer risk from exposure to 1,1-dichloroethylene can be estimated using the unit risk factor (URF) for this chemical, which is 0.5 per mg/kg/day. The cancer risk is calculated as:
Risk = Intake × URF = 0.0002 mg/day × 0.5 per mg/kg/day = 0.0001
Therefore, the cancer risk is 1 in 10,000.
(c) If the individual drinks this water for 30 years, the total exposure would be:
Exposure = Intake × 365 days/year × 30 years = 2.19 mg
The new hazard quotient is:
HQ = Exposure / (RfD × body weight) = 2.19 mg / (0.02 mg/kg/day × 70 kg) = 1.57
The new cancer risk is:
Risk = Exposure × URF = 2.19 mg × 0.5 per mg/kg/day = 1.10
Therefore, the cancer risk is 1 in 1,000.
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Examine the layers of rock. Identify and explain which layer contains the oldest fossils? Earth layers with fossiles in each labeled top to bottom A to D.
I need a paragraph
Answers
Answer:The answer is D i got this answer because, the oldest layers are at te bottom and the youngest layers are on the top.
hope this answer heps!
A naturally occurring sample of an element contains only two isotopes. The first isotope has a mass of 62.9296 amu and a natural abundance of 69.15 %. The second isotope has a mass of 64.9278 amu. You may want to reference (Page) Section 2.8 while completing this problem Part A Find the atomic mass of the element. 64.58 amu O 63.55 amu O 69.72 amu O 63.05 amu Submit Request Answer
Answers
correct answer is 63.22 amu.
Determining the atomic mass of an element requires calculating the weighted average of the masses of the two isotopes, taking into account their natural abundance. The atomic mass of an element is given by the formula:
Atomic mass = (mass of isotope 1 × natural abundance of isotope 1) + (mass of isotope 2 × natural abundance of isotope 2)
Inserting the values given in the question gives:
Atomic mass = (62.9296 amu × 0.6915) + (64.9278 amu × (1 - 0.6915))
= 43.40 amu + 19.82 amu
= 63.22 am
Therefore, the atomic mass of the element is 63.22 amu.
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Q16. Choose whether this is a physical or chemical change. *
cream
being
whipped
Answers
Because air puffs up the cream as it is whipped, there is a physical change even though the ingredients are still cream and air.
What is physical change ?Physical modifications are those that affect a chemical substance's form but not its chemical content. Physical changes may normally be used to separate compounds into chemical elements or simpler compounds, but they cannot be used to separate mixtures into their component compounds.
Liquid cream is extensively combined with small air bubbles to form the foam colloid known as whipped cream. Because milk is transformed from a colloid (cream) to a solid (butter) without changing its chemical makeup, turning milk into butter is a physical transformation. This change in the body can be undone.
Thus, there is a physical change even though the ingredients are still cream and air.
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In self-contained breathing devices used by first responders, potassium superoxide, KO2, reacts with exhaled carbon dioxide to produce potassium carbonate and oxygen:
Unbalanced: KO2(s) + CO2(g) --> K2CO3(s) + O2(g)
How much O2 could be produced from 85 g KO2?
Answers
Answer:
7.37. Oxygen for First Responders In self-contained breathing devices used by first responders, potassium superoxide, KO9, reacts with exhaled carbon dioxide to produce potassium carbonate and oxygen: 4 KO2s) 2 CO2g)2 K9CO3(s)+3 O2(g) How much O9 could be produced from 85g KOg?
Electron X can change to a higher energy level or a lower energy level. Which statement is true of electron X?
1
Electron X emits energy when it changes to a higher energy level.
2
Electron X absorbs energy when it changes to a higher energy level.
3
Electron X absorbs energy when it changes to a lower energy level.
4.
Electron X neither emits nor absorbs energy when it changes energy level.
Answers
Answer: 2) Electron X absorbs energy when it changes to a higher energy level.
Explanation:
The electrons in an atom exist in various energy levels. When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. When an electron moves from a higher to a lower energy level, energy is released (often as light).
Arrange these elements according to first ionization energy.
highest to lowest ionization energy
Li
N
Be
C
B
F
O
Ne
Answers
Answer:
please find the attached file.
Explanation:
In the attachment file, we define the order of the ionization of the energy.
As its components are seen, their energy of ionization rises and falls further. Nitrogen and oxygen were detected as an anomaly. Nitrogen has more IE than oxygen because Nitrogen has the \(2p^3\) configuration to Is half-filled It's got bigger IE than B. As, be making the 2s2 configuration fully disc.
Arrangement of elements according to first ionization energy from
highest to lowest ionization energy are Ne>F>O>N>C>B>Be.
Neon, a noble gas with a fully filled electron shell, has the highest ionisation energy of the substances on this list, making it the most stable and least likely to lose an electron. Fluorine has the second-highest ionisation energy, after helium. Due to its strong electron attraction, it is a highly electronegative element, making it more challenging to remove an electron from its outer shell. The ionisation energy of oxygen is third highest. Additionally, it has a high electronegativity and expels an electron with a lot of energy.
The fourth-highest ionisation energy is that of nitrogen, abbreviated as N. In terms of electronegativity, it is comparable to oxygen and requires a lot of energy to remove one electron. Carbon has the fifth-highest ionisation energy, after hydrogen and helium. An enormous amount of energy is needed to take an electron out of its outer shell. The second-lowest ionisation energy on this list belongs to borax, abbreviated as B. Compared to the other elements, boron is simpler to remove an electron from. Beryllium, symbol Be, has the lowest ionisation energy of all the elements on this list. From among these elements, an electron can be taken out the simplest.
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What does a branching tree diagram show?
A. The evolution in the size of organisms
B. The order in which specific traits may have evolved
C. The animal population in a specific time period
D. The rate of extinction of specific traits in living organisms
Answers
Answer:
B. The order in which specific traits may have evolved
Explanation:
Which of the following is an example of a nonrenewable resource?
a
cattle
b
uranium
c
cotton
d
trees
Answers
Answer:
b . uranium, It is not a renewable resource.
Which of these are effects of environmental change on populations? Check all that apply.
Answers
The statement "when a bottle of soda was opened, bubbles rapidly appeared in the liquid and were given off at the surface" can be categorized as an observation.
Observation refers to the act of noticing or perceiving something through the senses. In this case, the statement describes a specific event that was directly observed: the opening of a bottle of soda and the rapid appearance of bubbles in the liquid, which were then given off at the surface. This observation describes a phenomenon that can be witnessed and measured.
The appearance of bubbles when a bottle of soda is opened is a well-known and predictable occurrence. It can be explained by the principles of gas solubility and pressure.
The soda contains dissolved carbon dioxide (CO2) under high pressure, which is responsible for the carbonation. When the bottle is opened, the sudden release of pressure causes the dissolved CO2 to come out of solution, forming bubbles. These bubbles then rise to the surface and are released into the air.
While this statement captures an observed phenomenon, it does not propose a general principle or provide a comprehensive explanation of the underlying mechanisms. Therefore, it does not qualify as a law or theory, but rather as an observation based on direct sensory perception.
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Many types of fungi are responsible for the breakdown and
recycling of organic material in an ecosystem. Fungi are an
example of a(n)
Answers
Answer:
mushroom are a type of fungi
Explanation:
What would the cathode be in a nickel and copper electrolytic cell
Answers
Answer:
d
Explanation:
A student obtained 1.57 g of product in a chemical reaction in the lab although she expected to produce 2.04 g of product. What was the percent yield of the experiment?
A. 23.1%
B. 43.4%
C. 56.5%
D. 77.0%
Answers
Answer:
D. 77.0%
Explanation:
% yield = actual yield/theoretical yield x 100%
% yield = 1.57 g / 2.04 g x 100%
% yield = 76.96 (round up)
why do you think asteroids are located in the asteroid belt?
Answers
Answer:
the asteroid belt is created by asteroids, and the belt is made because of the planets gravitational pull
Explanation:
:3
1. The type of bond most likely to
occur between Mg and Br is a(n)
bond.
---
Answers
Answer:
Ionic bond.
Explanation:
Group 7 elements like Bromine (Br) and group 2 elements like Magnesium,(Mg) involved loss and gain of electrons which is typical with Ionic bonding.