Answer:
false
Explanation:
metal such as copper, silver, etc conducts heat and electricity. an object such as a rock, plastic, paper does NOT conduct heat.
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Answer:
Pppppppppppppppppppppppppppppp
What are the consequences of purposely having an excess of one of the reactants?
Answer:
When one reactant is in excess, there will always be some left over. The other reactant becomes a limiting factor and controls how much of each product is produced. While using excess reactants can help to increase percentage yields, this is at the expense of atom economy.
Explanation:
Is everything correct?
What is the LD50 of a substance?
In toxicology, the median lethal dose, LD₅₀, LC₅₀ or LCt₅₀ is a measure of the lethal dose of a toxin, radiation, or pathogen. The value of LD₅₀ for a substance is the dose required to kill half the members of a tested population after a specified test duration.
An 18.0 g sample of unidentified metal was heated from 21.5°C to 89.0°C.
292 J of heat energy was absorbed by the metal in the heating process.
Calculate the specific heat of the metal to determine its identity.(need work show, or how you got the answer)
A.calcium
B.iron
C.copper
D.silver
Answer: (d)-Silver
Explanation:
Given
The mass of sample is [tex]m=18\ gm[/tex]
It is heated from [tex]21.5^{\circ}C[/tex] to [tex]89^{\circ}C[/tex]
heat energy absorbed is [tex]292\ J[/tex]
Heat absorbed is given by [tex]Q=mc\Delta T[/tex]
Insert the values
[tex]\Rightarrow 292=18\times c\times [89-21.5]\\\Rightarrow 292=18\times c\times 67.5\\\\\Rightarrow c=\dfrac{292}{1215}\\\\\Rightarrow c=0.24\ J/g^{\circ}C[/tex]
As per the table, it is Silver
I need help with the first question, if you can help with the other two I would really appreciate it!
Answer:
5
Explanation:
What are some of the issues facing the ocean ( give at least 3 )
Answer:
Pollution
Overpopulation
Destruction of habitats
Explanation:
How is ethanol DIFFERENT from gasoline?
A. Ethanol is alcohol; gasoline is fuel.
B. Ethanol becomes a bacteria; gasoline becomes a chemical.
C. Ethanol helps break down yeast; gasoline is a by-product of
yeast.
D. Ethanol is made from oranges; gasoline is made from
petroleum
Al hacer reaccionar 5g de cinc con ácido sulfúrico se observa que la reacción ocurre en 20s. ¿Cuál será la rapidez de la reacción? Masa atómica del cinc 65,37g.
Answer:
0.0038 mole s-1
Explanation:
La velocidad de una reacción se refiere a la rapidez o la lentitud con que avanza una reacción. Se mide por la cantidad de reactivos que desaparecen por unidad de tiempo o por la cantidad de productos que aparecen por unidad de tiempo.
Número de moles de zinc = 5g / 65.37gmol-1 = 0.076 moles
Velocidad de reacción = 0.076 moles - 0 moles / 20 s - 0s = 0.0038 mole s-1
How can I calculate pH given pOH of 4.5?
Answer:
To find the pOH, simply subtract the pH from 14. In order to calculate the pOH, take the negative log of the hydroxide ion concentration.
Which of the following factors affects the amount of heat absorbed by a substance?
A. Boiling point of the substance
B. Specific heat capacity of the substance
C. Melting point of the substance
D. Shape of the substance
Answer:
The correct answer is B, "Specific heat capacity of the substance."
Explanation:
I just took the test. I hope this helps!
Heat absorbed changes the bonds of the molecules or the compounds to alter their state. The specific heat capacity affects the amount of heat absorbed. Thus, option B is correct.
What is specific heat capacity?Specific heat capacity is defined as the amount of heat or energy absorbed by the kilogram of the solid reactant when the system experiences a rise in temperature. It is measured in J/(kg K) or J/(kg °C).
The specific heat capacity, the mass of the substance, temperature, and the phase of the substance affects the absorption of the heat from the surrounding. The specific heat affects absorption as it tells about the substance's ability to take the heat energy.
Therefore, specific heat capacity affects heat absorption.
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Which statement most accurately describes a chemical equation?
a. in a chemical reaction, the mass of the energy change must be equal to the energy used
b. in a chemical reaction, the mass of the products must equal the mass of the reactants
c. in a chemical reaction, the mass of each product must be the same
d. in a chemical reaction, the combined mass of the container the substances is always equal
Answer: A
Explanation:
Helllpppp I will give you branliest!!! In which cell organelle is DNA found?
Answer:
nucleus
Explanation:
Answer:
Found in the nucleus
Explanation:
I hope this answer is correct and helpful!
Why is it important for the kitchen manager to make sure food is fresh?
What is the voltage of a galvanic cell made with zinc (Zn) and aluminum (AI)? A. 0.92 V
B. -0.92 V
c. -2.44 V
D. 2.44 V
Answer:
The correct option is (a) "0.92 V".
Explanation:
The voltage of a galvanic cell made with zinc (Zn) and aluminum (AI) is given by :
Voltage =Ered- Eoxd
Where
Ered = reduction potential
Eoxd = oxidation potential
As per reduction standard potentials, the emf of Zinc is -0.76 V and the emf of Aluminium is -1.66 V. So,
V = 0.76 - (-1.66)
= 0.9 V
Hence, the correct option is (a) "0.92 V".
For Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have?
OA 13
OB. 14
OC 26
OD. 27
O E 40
Answer:
14...................
Question: How do we read chemical formulas?
Any molecule can be represented by a formula that lists all the atoms in that molecule. Each element is represented by its atomic symbol in the Periodic Table – e.g. H for hydrogen, Ca for calcium. If more than one atom of a particular element is present, then it’s indicated by a number in subscript after the atomic symbol — for example, H2O means there are 2 atoms of hydrogen and one of oxygen.
If there is more than one of whole groups of atoms, then that’s shown with a bracket around them. For example, calcium hydroxide has one calcium (Ca) for every two hydroxides (OH), so is written as Ca(OH)2.
If a charge is present, it’s indicated in superscript, with a sign (+/-) and a number if more than one charge is present. For example, calcium ions have two positive charges so are written Ca2+.
Sometimes a formula can be written in a way that gives an indication of the structure. A chemical equation shows a reaction taking place. On the left-hand side are the reactants, the molecules that take part in the reaction. On the right-hand side are the products, the molecules that are created in the reaction. Each side must contain the same number of each kind of atom. An arrow between them indicates the direction the reaction is expected to occur:
Ca + Cl2 → CaCl2
Calcium + chlorine → Calcium chloride
If there are two or more of any molecules, that’s indicated with a number in front of the molecule:
CH4 + 2O2 → CO2 + 2H2O
One methane molecule + two oxygen molecules → one carbon dioxide molecule and two water molecules
An equation may sometimes specify which phase each molecule is in – whether it’s solid, liquid, or gas, or if it’s dissolved. This is written in brackets after the molecule – (s) for solid, (l) for liquid, (g) for gas, and (aq) for ‘aqueous’, meaning dissolved in water. For example, solid calcium carbonate reacts with carbonic acid in water to form calcium bicarbonate, which is much more soluble so becomes dissolved in water:
CaCO3 (s) + H2CO3 (aq) → Ca(HCO3)2 (aq)
Solid calcium carbonate + dissolved carbonic acid → dissolved calcium bicarbonate
All chemical reactions can actually proceed in either direction. Most of the time, one direction is expected to take place more strongly, so the arrow is written in that direction. However, many common reactions happen in both directions simultaneously, creating an equilibrium where the reactions are taking place but there is no net change in concentration from one side to the other. This is indicated with the symbol ⇌.
For example, carbonic acid in water is continually breaking down into bicarbonate and hydrogen ions – but the ions are also continually joining back together.
H2CO3 ⇌ HCO3– + H+
Carbonic acid ⇌ bicarbonate + hydrogen ions
what is the chemical formula for sugar ( in water)?
Hydrologers study the availability of fresh water on the planet.
Answer:
Hydrologists study how water interacts with the earth's crust. For example, they may study how rainfall and snowfall cause erosion, create caves, percolate through soil and rock to become groundwater, or eventually reach the sea.Hydrologists strive to improve water quality and increase our access to water so that we can continue to make use of it in all the ways that are necessary to our lives. A hydrologist measures the stream flow in a tributary to the Coeur d'Alene River. layers of gases surrounding a planet or other celestial body
Why do the two electrons spend their time equally between both hydrogen atoms? In other words, why can’t one hydrogen just take the other’s electron?
a chemist determined by measurements that 0.015 moles of tungsten participated in a chemical reaction. Calculate the mass of tungsten that participated in the chemical reaction.
Answer: 0.84g
Explanation:
When pressure, volume, and temperature of a gas are known, the ideal
gas law can be used to calculate the
a. chemical formula.
b. ideal gas constant.
c. number of moles.
d. rate of effusion.
Considering the ideal gas law, when pressure, volume, and temperature of a gas are known the ideal gas law can be used to calculate the number of moles (option c).
Ideal gas lawAn ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:
P×V = n×R×TThis caseBeing R the molar constant of gases, when pressure, volume, and temperature of a gas are known the ideal gas law can be used to calculate the number of moles (option c).
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Consider the following redox reaction:
2Cr(OH)3 + ClO3- + OH- CrO42- + 2 H2O
A) The reaction is balanced and occurred in an acidic environment
B) The reaction is unbalanced and occurred in a basic environment
C) The reaction is balanced and occurred in a basic environment
D) The reaction is unbalanced and occurred in an acidic environment
Answer:
kkahshsi
Explanation:
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2COOH
How many of each element is present in the following formula?
What series of decays would allow you to turn Lead, Pb-207 into Gold, Au-199?
Answer:
Two alpha particle decays and one beta particle decay.
Explanation:
If Lead Pb-207 is to turn into Gold, Au-199, there needs to be a drop in mass number from 207 to 199. That drop is 207 - 199 = 8.
Since the mass number of an alpha particle(⁴₂He) is 4, to lose 8 nuclear particles(neutron + proton), we need 8 particles/nucleus ÷ 4 particles per alpha particle nucleus = 2 alpha particles.
The nuclear equation is given below
²⁰⁷₈₂Pb → ¹⁹⁹₇₉Au + ⁴₂He + ⁴₂He
Note that the charge is not balance
82 ≠ 79 + 2 + 2 = 83
For this to be balanced, we need to lose a beta particle, ⁰₋₁e. So, our equation becomes
²⁰⁷₈₂Pb → ¹⁹⁹₇₉Au + ⁴₂He + ⁴₂He + ⁰₋₁e
So, series of decays would allow you to turn Lead, Pb-207 into Gold, Au-199 are two alpha particle decays and one beta particle decay.
A car travels at 24km/hr to the north. Then it travels 24km/hr to the east. Which is true about the car's acceleration?
a
The car accelerated because it speed increased.
b
The car accelerated because it changed direction.
c
The car did not accelerate because its speed did not change.
d
Only the velocity changed, not the acceleration not the acceleration.
Answer:
D
Explanation:
What is the chemical name for 1 nitrogen atom,
2 hydrogen atom?
NH3 has 1 Nitrogen atom and 3 hydrogen atoms.
When workers stop working entirely, it is called a(n)
Answer here
SUB
Answer:
Explanation:
When workers stop working entirely, it is called either a strike or retirement, depending on the circumstances under which it is done. A strike is a mass refusal of employees to work, because they are not satisfied.
Retirement on the other hand happens when the employee reaches certain age, after which he/she can leave the job and get a pension,.
The fungus known as “chicken of the woods” grows on trees. the fungus breaks down the tree and gets its nutrients that way. the tree decays gets weak and becomes very vulnerable to extreme weather.
Benefits, harmed, parasitism
Answer:
the answer is harmed
Explanation:
Brainliest plzzzzzzzzzz
4. Use the particle theory to explain density.
Answer:
Density is the total number of particles in a given volume
Explanation:
As per the particle theory, density is defined as total space occupied by certain number of particles of any given element with in a defined volume is termed as density.
Density is not the denseness of a single unit but the space occupied by many single units with in a given volume V
Hence, density is the total number of particles in a given volume.