Answer:
A description of the experiment the chemicals were used for.
Explanation:
A chemical waste label is required to provide information about any hazardous waste present in the container. Some details are mandatory to mention of the chemical waste label to prevent any accident while doing the experiment, that includes:
Chemical compound's name present in the container.Composition and physical state of the waste.Hazardous properties of the waste.The date of manufacturing.Amount of chemical compounds filled in the container.A chemical waste label does not mention or describe the experiment for which the chemicals were used for, scientists, teacher or students should have knowledge of the chemical composition by reading their names and evaluate themselves on which chemical should be used for which experiment.
Hence, the correct answer is "A description of the experiment the chemicals were used for."
The correct answer is A description of the experiment the chemicals were used for.
A chemical waste label must contain all the information about any hazardous waste present in the container. It should clearly indicate the composition of the waste, the date of manufacturing and the amount of chemical compounds filled in the container. A chemical waste label does not need to mention the experiment for which the chemicals were used.
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Matter is anything with (1)
and volume. A (2)
is a form of
matter with a uniform and unchanging composition. Substances have specific, unchanging
(3)
that can be observed. Substances have both physical and chemical properties.
properties colate observed without changing a substance's chemical
composition. Color, hardness, and (5)
are examples. Other properties cannot be
observed without changing the composition of a substance. These are called (6)
properties
An example is the tendency of iron to form rust when exposed to air.
Matter is found all around us and is present in all substances in the universe. Substances have a uniform composition and changes in this composition of of a substance is called chemical reaction.
The appropriate words that fill in the blanks are;
1) Mass
2) Substance
3) Properties
4) Physical
5) Density
6) Chemical
Matter has mass and occupy space. Matter with a uniform and unchanging composition is called a substance.
Substances have physical and chemical properties. The physical properties of a substance such as density can be observed without changing the composition of the substance.
Chemical properties of a substance such as rusting can only be observed when the chemical composition of the substance is altered(chemical reaction).
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Lewis diagrams of molecules of three different hydrocarbons are shown above. Which of the following claims about the molecules is best supported by the diagrams?
Answer:
D
Explanation:
Seeing the Lewis formula for each of the molecules, we can attempt to write the condensed structural formula for each.
What we notice is that while there are purely single bonds between the carbon atoms in the first molecule, there is a double bond in the second molecule and a triple bond in the third
What we can deduce from this is that these are alkanes , alkenes and alkynes
The alkynes have the strongest of the three bonds and thus they have the strongest bonds in the mix
Since molecule 3 is an alkyne, then we can say that it has the strongest of the bonds
The correct claim about the molecules that best supports the diagrams is :
( D ) The strongest carbon to carbon bond occurs in molecule 3
The first molecule ( molecule 1 ) is an alkane because the molecule is made up of only single bonds connecting the carbon atoms.
while the second mole ( molecule 2 ) is an alkene because of the presence of a double bond connecting carbon atoms.
and the third molecule ( molecule 3 ) is an alkyne because of the presence of a triple bond connecting carbon atoms.
Therefore Alkynes have the strongest of of bonds between its carbon atoms because of the presence of a triple connecting carbon atoms.
Hence we can conclude that The strongest carbon to carbon bond occurs in molecule 3
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Based on the results the students record, which group makes the most accurate measurements of the object?
Answer:
B.
Explanation:
It’s because when you subtract 78.5 and 77.5 you get 1. And when you do 79.5 and 78.5 you get 1 too. I know this because I got the answer right
HURRY PLS!
A wave has a wavelength of 915 meters. what is the frequency of the light?
Answer:
327.8689 (Hz)
0.3279 (KHz)
0.0003 (MHz
0 (GHz)
Please help me, I am struggling please help
what is called when a paragraph studies data carefully
✅Paraphrasing and summarizing .✅
IamSugarBee
Write this measurement in scientific notation: 0.000130 L
Answer:1.30 x 10 to the 4th
Explanation:
Just know
This illustration is an example of a
The illustration is an example of surface waves.
Approximately how many joules of heat energy are released when 50 grams of water are cooled from 70°C to 60°C?
Answer:
Q = -2090 J
Explanation:
Given that,
Mass, m = 50 g
Water is cooled from 70°C to 60°C.
We need to find how many heat energy are released. Heat released is given by :
[tex]Q=mc\Delta T[/tex]
c is the specific heat of water, [tex]c=4.18\ J/g-C[/tex]
Putting all the values,
[tex]Q=50\times 4.18\times (60-70)\\\\Q=-2090\ J[/tex]
So, the heat energy released is 2090 J and negative sign shows heat is released.
Answer:
it is 2,100J
Explanation:
which way do heat flow
Answer:
Right side of the heart
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
Explanation:
Which of the following would most likely have grains cemented together?
a. marble
C. limestone
b. schist
d. diorite
Please select the best answer from the choices provided
c
A
B
С
D
Answer:
limestone
Explanation:
the density of titanium metal is 4.51 g/cm at 25°C. what mass of titanium displaces 125.0mL of water at 25°C?
Answer:
The answer is 563.75 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 125 mL = 125 cm³
density = 4.51 g/cm³
We have
mass = 125 × 4.51
We have the final answer as
563.75 gHope this helps you
Absorption: Occurs when light waves transfer energy to particles of What?
Answer: when light hits the surface of an object the energy is transferred into the particles in the surface of the object thats why when u leave somthing by a window or outside in the sun it warms up and when it hits object that isnt clear enough to reflect or disperce the object obsorbes the white light and some of the colors of the white light thats why you see a rainbow like color when you put the object in the light.
Explanation:
A. none of the above
B. 12000 m/s
C. 0.53 m/s
D. 1.875 m/s
A. none of the above
The answer would be 180 m/s
Hope this helps! Brainliest if you can!
What happens to a solute?
A. It gets dissolved in something else.
B. It settles out of the solution.
C. It forms a solid in the solution.
O D. Something gets dissolved in it.
A solute gets dissolved in something else. (solvent)
What is a solute?A solute is a substance which dissolves in something else, like a solution. As a result, a homogeneous mixture is formed. A solute can be a gas, solid or a liquid.
What is a solvent?A solvent is a substance in which a solute happens to dissolve in order to produce a homogenous mixture. Solvents can also exist as solids, liquids as well as gases.
For example, NaCl is a solute which dissolves in water, which is a solvent. The equation is as follows
NaCl (aq) + H2O (l) → NaOH (aq) + HCl (aq)
Hence, option A is the correct option.
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What will the coefficients be for the following balanced equation? (a) N2 + (b) H2 → (c) NH3
Answer:
his reaction is the synthesis of Ammonia using Nitrogen and Hydrogen gas.
N
+
H
→
N
H
3
We must remember that Nitrogen and Hydrogen are both diatomic molecules in their standard gas form. This adjusts the equation to
N
2
+
H
2
→
N
H
3
Now we need to adjust coefficients in order to balance the atoms on each side of the equation. Currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.
We can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.
N
2
+
3
H
2
→
2
N
H
3
This gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.
I hope this was helpful.
Explanation:
Answer:
1N2 + 3H2 →2NH3
Explanation:
Plato answer
1. The human eye can detect wavelengths of light as short as 0.000037 cm. What is this
wavelength in nanometers?
Answer:
0.000037 cm is 370 nanometers
Explanation:
What is this phenomenon called?
A.
codominance
B.
coinheritance
C.
incomplete dominance
D.
single gene dominant/recessive trait
If a compound is made up of more than one element why is it considered a pure substance? Choose 2 Group of answer choices The compound has different properties than the individual elements A compound can not be physically separated A compound can not be chemically separated A compound can be physically and chemically separated
Answer:
A compound can not be physically separated
Explanation:
A compound is a chemical substance that comprises of atoms of more than one element i.e. two or more elements are chemically combined to form a compound. However, as stated in this question, compounds are referred to as pure substances.
This reason is attributed to the fact that a compound cannot be physically separated i.e. the constituents of a compound cannot be separated using physical changes or methods. This is because the atoms of the constituent elements are combined or joined together by chemical bonds.
Answer:
Even though a compound can be made of two or more types of atoms, it is still a pure substance because the compound can be isolated, like salt or water.
Explanation:
I NEED HELP!!! How is continental crust different from oceanic crust?
Oceanic crust is thinner and more likely to sink.
Oceanic crust is thicker and more dense.
Continental crust is more dense and lighter.
Continental crust is thicker and more likely to sink.
Answer:
A
Explanation:
Oceanic crust is thinner and more likely to sink
Answer:
The answer is A Oceanic crust is thinner and more likely to sink.
Explanation:
I hope this is right sorry if it's not.
List and describe six forms of energy.
Answer:
Gravitational energy, electric energy, magnetic energy, nuclear energy, thermal energy, chemical energy.
Explanation:
gravitational energy - the energy resulting from the attraction of two masses to each other
electric energy - energy from a static or moving electrical charge.
magnetic energy - energy from the attraction of opposite magnetic fields, repulsion of like fields, or from an associated electric field
nuclear energy - energy from the strong force that bonds protons and neutrons in an atomic nucleus
thermal energy - also called heat, this is energy that can be measured as temperature. It reflects the kinetic energy of atoms and molecules
chemical energy - energy contained in chemical bonds between atoms and molecule
mechanical energy - the sum of the kinetic and potential energy
radiant energy - energy from electromagnetic radiation, including visible light and x-rays (for example)
Using the choices below, which is the complete symbol for the isotope that has the following subatomic particles: 19 protons, 21 neutrons, and 18 electrons.
(A: 40 19 K -1)
(B: 40 21 Sc +1)
(C: 38 19 K +1)
(D: 40 19 K +1)
(E: 39 18 Ar +1)
a. A
b. B
c. C
d. D
e. E
Answer:
Option D. ⁴⁰₁₉K⁺¹
Explanation:
The following data were obtained from the question:
Proton number = 19
Neutron number = 21
Electron number = 18
Complete symbol of isotope =.?
Next, we shall determine the atomic number of the isotope. This is illustrated below:
Atomic number of an element is simply the number of protons in the atom of the element. Thus,
Atomic number = proton number
Proton number = 19
Therefore,
Atomic number = proton number = 19
Since the atomic number of the isotope is 19, the isotope is simply potassium with symbol K.
Next, we shall determine the mass number of the isotope. This can be obtained as follow:
Proton number = 19
Neutron number = 21
Mass number =.?
Mass number = Proton + Neutron
Mass number = 19 + 21
Mass number = 40
Next, we shall determine the charge on the isotope. This can be obtained as follow:
Proton number = 19
Electron number = 18
Charge =.?
Charge = Proton – Electron
Charge = 19 – 18
Charge = +1
Summary:
Atomic number = 19
Mass number = 40
Symbol = K
Charge = +1
Complete symbol = ⁴⁰₁₉K⁺¹
which element, Magnesium or Barium, will react more violently with water, and
WHY?
Answer:
magnesium
Explanation:
A piece of gold has a mass of 21.7 kg and a volume of 5.78 cm3 . What is the density of gold? (Convert kgg)
Answer:
The answer is 3754.33 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 21.7 kg = 21700 g
volume = 5.78 cm³
We have
[tex]density = \frac{21700}{5.78} \\ = 3754.3252...[/tex]
We have the final answer as
3754.33 g/cm³Hope this helps you
Alexandra is preforming this combustion reaction i lab: C3H8 + 5O2 + 3CO + 4h20. If she carefully measures out 220 g of C3H8 and discovers she has produced 660 g of carbon dioxide and 360 g of water, how many grams of oxygen must have been required to react with the C3H8?
Answer:
800 g of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
C3H8 + 5O2 —> 3CO2 + 4H2O
Next, we shall determine the masses of C3H8 and O2 that reacted from the balanced equation. This is illustrated below:
Molar mass of C3H8 = (12×3) + (8×1)
= 36 + 8
= 44 g/mol
Mass of C3H8 from the balanced equation = 1 × 44 = 44 g
Molar mass of O2 = 16 × 2 = 32 g/mol
Mass of O2 from the balanced equation = 5 × 32 = 160 g
From the balanced equation above,
44 g of C3H8 reacted with 160 g of O2.
Finally, we shall determine the mass of O2 needed to react with 220 g of C3H8. This can be obtained as follow:
From the balanced equation above,
44 g of C3H8 reacted with 160 g of O2.
Therefore, 220 g of C3H8 will react with = (220 × 160)/44 = 800 g of O2.
Thus, 800 g of O2 is needed for the reaction.
Plz help! :D
What element is as hard as magnesium?
Answer:
Calcium
Explanation:
Im not 100% sure tho
PLEASE HURRY (WILL MARK BRAINLIEST)
What happens when the sound waves released by a bat hit an object?
The sound waves are diffused.
The sound waves are reflected.
The sound waves are refracted.
The sound waves are absorbed,
Answer:
B.) The sound waves are reflected.
Explanation:
On edge,
i also answered so the other person could get the brainliest
Answer:
b
Explanation:
As fuel is burned in an airplane, it seems to disappear from the tank, suggesting that matter is destroyed during the reaction. Identify the scientific law that is of importance here. Explain why this is not true, and describe where the matter goes.
Answer:
Well we know that matter is neither created nor destroyed by chemical reactions or physical transformations. It is not destroyed it simply was converted to gas. =D
The scientific law that is of importance here is the 'Law of conservation of mass'.
The law of conservation of mass states that ' mass can neither be created nor be destroyed.In other words, a mass of an element before and after the chemical reaction remains the same.The airplane uses energy generated in the reaction of burning fuel to run the engine for movement.A fuel burned in an airplane had undergone a chemical reaction that converted fuel into a gaseous product.These gaseous products are then eliminated through exhaust from the airplane leaving the tank empty.No mass is destroyed during this process only conversion of mass took place.So, from this, we can conclude that the scientific law that is of importance here is the 'Law of conservation of mass'.
Learn more about the 'law of conservation of mass':
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Which technology is shown in the photograph?
A. Negative controls
B. Biostimulation reaction
C. Gel electrophoresis
D. Polymerase chain reaction
Answer:
C
Explanation:
Apex
How many atoms are there in 4.13 moles of nickel (Ni)
Answer:
24.87× 10²³ atoms of Ni
Explanation:
Given data:
Number of atoms of Ni= ?
Number of moles of Ni = 4.13 mol
Solution:
we will calculate the number of atoms of Ni by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
4.13 mol × 6.022 × 10²³ atoms /1 mol
24.87× 10²³ atoms of Ni
