Answer:
yes it is a danger.Copper doesn't break down in the environment, leading to its accumulation in plants and animals. Absorption of some copper into the body is essential for human health. Acute industrial exposure to copper fumes, dusts or mists can result in chronic copper poisoning.Copper is a mineral and an element essential to our everyday lives. It is a major industrial metal because of its high ductility, malleability, thermal and electrical conductivity and resistance to corrosion. It is an essential nutrient in our daily diet.
A balance and a graduated cylinder are used to determine the density of a liquid sample. The sample has a mass of 14.0 g and a volume of 2.0 mL. What is the density of the liquid sample
Answer:
Density = 7 g/mL
Explanation:
Given that,
Mass of a sample, m = 14 g
Volume of the sample, V = 2 mL
We need to find the density of the liquid sample. We know that the density of an object is given by :
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{14\ g}{2\ mL}\\\\d=7\ g/mL[/tex]
So, the density of the liquid sample is 7 g/mL.
You are given a clear-water solution containing potassium nitrate. How could you determine whether the solution is unsaturated, saturated, or supersaturated?
Answer:
If it is unsaturated, we can dissolve some more amounts of potassium nitrate into it Explanation:
Pick the input(s) into the system. (select all that apply)
A battery powered robot with glowing eyes walking across the floor and making noise.
Radiant/Light Kinetic Energy
Nuclear Potential Energy
Chemical Potential Energy
None of these are inputs
Motion Kinetic Energy
Electrical Kinetic Energy
Answer:
So none of the option is correct.
Explanation:
The energy is the capacity of to work.
It is a scalar quantity.
According to the law of conservation of energy, the energy can neither be created and nor be destroyed, it can transform from one form to another.
For example, in case of a light bulb, the electric energy is converted into the light and heat energy.
When a battery operated robot with glowing eyes moving on the floor, the chemical energy of the battery is converted into the light energy and the kinetic energy so the law of conservation of energy holds good.
An oxide of nitrogen contain its own volume of nitrogen
its vapour dentity is 22. Find the molecular formula
Of nitrogen Oxide
Answer:
NO2 is the molecular formula of nitrogen Oxide
Explanation:
Correct question
An oxide of nitrogen contain its own volume of nitrogen
its vapour dentity is 23. Find the molecular formula
Of nitrogen Oxide
Solution
As we know
Molecular Weight is equal to two times the vapour density
Hence, the molecular weight of Oxide of nitrogen is 2 * 22 = 44
Molecular weight of Oxide of nitrogen is the sum of atomic weight of nitrogen and oxygen
Molecular weight of Oxide of nitrogen = 14 + 16 *Y
14 + 16 *Y = 46
Y = 2
Hence, the formula is NO2
determine the number of significant figures in 478 cm
Answer:
There are 3 significant figures on this one.
Given: 2 AgNO3 + Cu -> Cu(NO3)2 + 2 Ag How many grams of AG can be produced if 200.0g of AgNO3 used?
Answer:
127 g of Ag are made in the reaction.
Explanation:
Reaction is: 2 AgNO₃ + Cu → Cu(NO₃)₂ + 2 Ag
If we only have data from nitrate, we assume the Cu is in excess.
We determine the moles of silver nitrate:
Mass / Molar mass → 200 g / 169.87 g/mol = 1.18 moles
Ratio is 2:2. If 2 moles of silver nitrate produce 2 moles of Ag, then
1.18 moles of salt, will produce 1.18 moles of silver
We convert mass to moles:
1.18 mol . 107.87 g/mol = 127 g
How does Chernobyl Episode 4 portray the traumatic effects of the situation on people, as opposed to the effects of the radiation?
Answer:
Showing changing colour of the skin who exposed to the radiation.
Explanation:
Chernobyl Episode 4 portray the traumatic effects of the situation on people by showing changing colour of skin of the staff present at nuclear reactor at the time of explosion. The people who exposed to the radiations of the nuclear reactor will die later in the hospital which shows that radiation of nuclear reactor is hazardous and damaging for the skin as well as for the body of humans.
is there a way u could see if the element is acid,base or salt in the periodic table?
Answer:
OK i see
Explanation:
Can I please get help with chemistry.
I got these three questions wrong and I’m wondering which answers would be right for the questions.
Answer: The 3rd one
Explanation: Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.
I might be wrong
Given the balanced equation and the equilibrium concentrations shown:
N2 + 3H2=>2NH3
Equilibrium Concentrations:
N2: 9.76 M
H2: 6.52 M
NH3: 8.62 M
What is the value of K?
Answer:
K= 0.0275
Explanation:
The K of a reaction is defined as the ratio between the concentration of products over concentration of reactants powered to its coefficient. In the reaction of the problem, K is:
K = [NH3]² / [N2] [H2]³
Replacing the concentrations in K:
K = [8.62M]² / [9.76M] [6.52M]³
K= 0.0275Answer:
The value of K is 0.027.
Explanation:
Chemical equilibrium is a state of a reversible chemical system in which no changes are observed as time passes, despite the fact that the substances present continue to react with each other. That is, the chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed.
The Law of Mass Action says that the product of the equilibrium concentrations of the products raised to their respective stoichiometric coefficients, divided by the product of the concentrations of the reactants in the equilibrium raised to their respective stoichiometric coefficients, is a constant for each temperature, called the equilibrium constant Kc. So, being:
aA + bB ⇄ cC + dD
Then: [tex]Kc=\frac{[C]^{c} *[D]^{d} }{[A]^{a} *[B]^{b} }[/tex]
In this case, the reaction is:
N₂ + 3 H₂ ⇒ 2 NH₃
So, the equilibrium constant is:
[tex]Kc=\frac{[NH_{3} ]^{2} }{[N_{2} ]*[H_{2} ]^{3} }[/tex]
Being:
[N₂] = 9.76 [H₂] = 6.52 [NH₃]= 8.62Replacing:
[tex]Kc=\frac{8.62^{2} }{9.76*6.52^{3} }[/tex]
Solving
Kc= 0.027
The value of K is 0.027.
What is SnO2 compound name
Which statement is correct regarding metamorphic rock formation?
A) The temperature inside Earth is cooler which allows metamorphic rocks to form more quickly.
B) Small pieces of rocks are buried, squeezed, and cemented together.
C) Weathering and erosion cause rocks to break down to form metamorphic rocks.
D) The deeper into Earth’s crust, the higher the pressure that forms metamorphic rocks.
Answer:
d answer is correct
Explanation:
the deeperinto Earth’s crust the higher the pressure that forms mateamorphic rocks
The deeper into Earth’s crust, the higher the pressure that forms metamorphic rocks is the best statement regarding metamorphic rock formation. Thus, option D is correct.
What are the metamorphic rocks?Metamorphism, a process that changes one type of rock into another, is the source of metamorphic rocks. The original rock is frequently subjected to pressures of at least 100 megapascals and temperatures between 150 and 200 °C, which profoundly alter its physical or chemical composition.
They are commonly used in both architecture and art. Statues and decorative objects like vases are made of marble (Figure). Due to its extreme hardness, quartzite is frequently crushed and used to construct train rails.
Therefore, option D is correct, that the best statement about the creation of metamorphic rocks is that the pressure increases the deeper into the Earth's crust.
Learn more about the metamorphic rocks, refer to:
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6 Select the correct answer. A substance is followed by the symbol (l) in a chemical equation. What does the symbol represent?
A. The substance has the least molecules in the equation.
B. The substance is in the liquid state.
C. The substance is produced last in the reaction.
D. The substance is dissolved in a liquid solution.
E. The substance is lost at the end of the reaction.
Answer:
B. The substance is in the liquid state.
Explanation:
The symbol (l) in a chemical equation represents that the substance is in liquid state which is one of the physical states of a chemical substance.
which term best described energy stored in batteries and food
Answer:
energy stored is potential.
Explanation:
Can someone please help
Answer:the third one
Explanation:
what is electroplating? write complete process of electro plating with the example
Answer:
Electroplating is the process of applying a metal coating on another piece of metal (or another conductive surface) through an electro-deposition process. In electroplating, the deposited metal becomes part of the existing product with the plating/coating.
Explanation:
To understand the concept further, let’s take an example of a gold coating. In this instance, a layer of gold is to be electrodeposited on metallic jewellery to enhance its appearance.Usually, the gold plating is connected to the anode (+ve charged electrode) of the circuit and the jewellery is kept at the cathode (-ve charged electrode). Both are kept immersed in a highly developed electrolytic bat (solution). At this stage, a DC current is supplied to the anode that oxidizes the gold atoms and dissolves them into the solution.The dissolved ions of gold are reduced at the cathode and plated on the jewellery.However, there are major factors that influence the last plating. These include:The voltage level of current.The temperature and chemical composition of the bath.The current length of time.The distance between the cathode and the anode.( ◜‿◝ )♡
PLEASE MARK ME BRAINLIEST AND FOLLOW ME LOTS OF LOVE FROM MY HEART'AND SOUL DARLING TEJASVINI SINHA HERE ❤️2Al + 6HCl --> 2AlCl3 + 3H2 Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP? ( 8.8 g )
Answer:
8.8g of Al are necessaries
Explanation:
Based on the reaction, 2 moles of Al are required to produce 3 moles of hydrogen gas.
To solve this question we must find the moles of H2 in 11L at STP using PV = nRT. With these moles we can find the moles of Al required and its mass as follows:
Moles H2:
PV = nRT; PV/RT = n
Where P is pressure = 1atm at STP; V is volume = 11L; R is gas constant = 0.082atmL/molK and T is absolute temperature = 273.15K at STP
Replacing:
1atm*11L/0.082atmL/molK*273.15K = n
n = 0.491 moles of H2 must be produced
Moles Al:
0.491 moles of H2 * (2mol Al / 3mol H2) = 0.327moles of Al are required
Mass Al -Molar mass: 26.98g/mol-:
0.327moles of Al * (26.98g / mol) = 8.8g of Al are necessaries
A trophic level is a number that tells you the position an organism occupies in a food chain or food pyramid.
True
False
Answer:
true
Explanation:
What element is produced when Mercury - 204 undergoes alpha decay?
Answer:
bismuth
Explanation:
i think if not i am so sorry
Aleena visited a Natural Gas Compressing unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions.
(a) Low temperature, low pressure
(b) High temperature, lowpressure
(c) Low temperature, highpressure
Answer:
(c) Low temperature, high pressure
Explanation:
Liquefaction of a gas means the conversion of the gas to liquid. To convert a gas to liquid, we have to look a bit at the statements of the kinetic theory of gases.
Gases show ideal behavior within the range of high temperature and low pressure. Under these conditions, minimum intermolecular interactions occur between gas molecules.
However, as the temperature is deceased and pressure in increased, intermolecular interactions become significant and the gas begins to liquefy.
WILL GIVE BRAINLIEST
During an endothermic reaction, H for the reactants was −600 kJ/mol. Which of the following statements is correct about the H for the products the comparison of the energy in bonds? (5 points)
It is less than −600 kJ/mol, and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
It is less than −600 kJ/mol, and the amount of energy required to break bonds is less than the amount of energy released in forming bonds.
It is greater than −600 kJ/mol, and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
It is greater than −600 kJ/mol, and the amount of energy required to break bonds is less than the amount of energy released in forming bonds.
Answer:
It is greater than -600kJ/mol and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
Explanation:
In an endothermic reaction, the reaction requires a determined amount of energy to occurs.
The reaction of the problem has H = -600kJ/mol. The reaction is endothermic and the energy that the reaction needs is absorbed by the reactants. That means, the energy of products:
Is greater than -600kJ/mol and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
Answer:
It is greater than -600kJ/mol and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
Explanation:
Water can keep engines operating at low temperatures. Which property of water most likely gives it this ability?
A. it boils at around 100°C
B. it has a high heat capacity
C. it is a good lubricant
D. it can change from water to ice
Answer:
B: it has a high heat capacity
Explanation:
When any material has a high specific heat capacity/ heat capacity, it doesn't heat or cool very fast. So water can absorb more heat from the engine and can keep the engine cool or at low temperature for a longer period of time.
8.
(a) Tick (™) the box next to the correct statement about the mixture.
mixture of four elements
mixture of four compounds
mixture of two elements and two compounds
mixture of one element and three compounds
Answer:
mixture of four compounds
mixture of two elements and two compounds
Explanation:
it can be one of thosecan u tell me if its correct pls I'm studying this toowhich of the following would not form a covalent bond
Hydrogen and oxygen
Gallium and Iodine
Nitrogen and Oxygen
Carbon and Chlorine
Answer:
Gallium
Iodine
Chlorine
Find the mass of carbon present in 0.92 g of Ethanol, [tex]C_2 H_5 OH[/tex]
0.92 × 1/46 × 2/1 × 12/1 =
0.02 × 2 × 12 =
0.04 × 12 =
0.48 gr carbon
The mass of carbon in one mole of ethanol (46.03 g) is 12.0 g. Thus, mass of carbon in 0.92 g of ethanol is 0.48 g.
What is ethanol?Ethanol is an alcohol with the formula C2H5OH. This organic compound having a molecular weight of 46.03 g/mol.
Atomic mass of carbon = 12.01 g/mol
oxygen = 16 g/mol
hydrogen = 1.01 g/mol
Thus total mass of one mole of ethanol = (12.01×2) +(16) +(6×1.01) = 46.03 g/mol
46.03 g of ethanol contains 2402 g of carbon. Thus mass of carbon in 0.92 g of ethanol is calculated as follows;
(24.02 × 0.92) / 46.03 = 0.48 g
Hence, the mass of carbon in 0.92 g of ethanol is 0.48 g.
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Which force is most responsible for binding together an atom’s protons and neutrons?
electrostatic
gravitational
nuclear
magnetic
Answer:
Hello There!!
Explanation:
I believe the answer is nuclear.
hope this helps,have a great day!!
~Pinky~
Answer:
C) Nuclear
Explanation:
Trust the process
Edge 2021
Which element is classified as a
metalloid?
a.
Boron
b. Potassium
C.
Sulfur
d. Xenon
Answer: Boron
Explanation:
what are the possible values of ml for l=2
Answer:
-2, -1, 0, 1, 2
Explanation:
There are four types of quantum numbers;
1) Principal quantum number (n)
2) Azimuthal quantum number (l)
3) magnetic quantum number (ml)
4) Spin quantum number (s)
The azimuthal quantum number (l) describes the orbital angular momentum and shape of an orbital while the magnetic quantum number shows the projections of the orbital angular momentum along a specified axis. This implies that the magnetic quantum number shows the orientation of various orbitals along the Cartesian axes. The values of the magnetic quantum number ranges from -l to + l
For l= 2, the possible values of the magnetic quantum number are; -2, -1, 0, 1, 2
What is the Molarity of a solution made by taking 2.5 moles and dissolving it into enough water to make 5.0 Liters of solution?
Answer:
.5 M
Explanation:
molarity = moles / liters
2.5/5 = .5 M
Balance this equation
Fe2O2 + C -> Fe + CO2
2 FeO + 1 C ===》2 Fe + 1 CO2
Explanation:
Fe2O2+C-----> 2Fe+CO2
balanced equation..
hope it helps.
stay safe healthy and happy.......