The observation, in this case, is quantitative.
Quantitative observationQuantitative observations are observations that can be recorded based on quantitative data. In other words, they are observations that can be assigned numerical values.
Quantitative observations are as opposed to qualitative observations because the former cannot be assigned numerical values. They can be ranked or qualified.
In this case, Danielle and Heather could assign numbers to the length, width, and height of the tank in order to calculate its volume.
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What started universe (Science)
Answer:
Big bang theory
Explanation:
Our universe began with an explosion of space itself - the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies.
Answer:
The Big Bang
Explanation:
The Big Bang was the moment 13.8 billion years ago when the universe began as a tiny, dense, fireball that exploded. Most astronomers use the Big Bang theory to explain how the universe began.
what would be the water potential of pure water at atmospheric pressure?
how many atoms of boron are present in 8.0*10^-6 moles of boron
Explanation:
Molar mass of
B
=
10.81
g
⋅
m
o
l
−
1
. If there are 36 odd grams of
B
, there are approx.
7
2
×
N
A
boron atoms, where
N
A
is Avogadro's number.
Explanation:
35.76
⋅
g
10.81
⋅
g
⋅
m
o
l
−
1
×
6.022
×
10
23
m
o
l
−
1
=
?
?
Answer link
MAT
Nov 15, 2015
1.991
×
10
24
Explanation:
Molar mass of B = 10.81g/mol
So, 1 mole of B = 10.81g
and 1 mole =
N
A
=
6.023
×
10
23
By combining,
10.81g of B =
6.023
×
10
23
atoms of B
thus,
35.76g of B =
6.023
×
10
23
10.81
×
35.76
35.76g of B =
1.991
×
10
24
48.176 × 10¹⁷ atoms of boron are present in 8.0 × 10⁻⁶ moles of boron.
Avogadro's NumberAvogadro's number is the number of particles in one mole of substance. 6.022 × 10²³ is known as Avogadro's constant / Avogadro's number.
Avogadro's number = 6.022 × 10²³
How to find the number of atoms ?
Number of atoms = Number of moles × Avogadro's Number
= 8.0 × 10⁻⁶ × 6.022 × 10²³
= 48.176 × 10¹⁷ atoms of boron
Thus, from the above conclusion we can say that 48.176 × 10¹⁷ atoms of boron are present in 8.0 × 10⁻⁶ moles of boron.
Learn more about the Avogadro's Number here: brainly.com/question/859564
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The chemical characteristics or reactivity of an element depend mostly on the.
The chemical characteristics or reactivity of a chemical element is highly (mostly) dependent on the: number of valence electrons in its outermost shell.
What is chemical characteristics?A chemical characteristic can be defined as the properties of a chemical element or compound that is mainly observable and measurable during a chemical reaction such as reactivity.
What is a valence electron?A valence electron can be defined as the number of electrons that are present in the outermost shell of an atom of a chemical element.
In Chemistry, the number of valence electrons (valency) is a property that is typically used to determine the chemical characteristics or reactivity of all chemical elements.
In conclusion, the chemical characteristics or reactivity of a chemical element is highly (mostly) dependent on the number of valence electrons in its outermost shell.
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This response to stimuli is very important in protecting the eyes because although they need light to see, too much light can cause serious damage. Which of the following best describes the nervous system's role in changing pupil size in response to light?
A.
The nervous system works without the aid of other systems in order to provide a sufficiently rapid response.
B.
The nervous system receives and interprets sensory information from the eyes and signals the muscles of the eyes to perform the response.
C.
The nervous system is a network of electrical impulses that becomes activated after the muscles within the eyes perform the response.
Answer:
The nervous system receives and interprets sensory information from the eyes and signals the muscles of the eyes to perform the response.
Explanation:
"The involuntary response of pupils dilating and contracting in response to light involves nerves sending impulses to and from the eyes' light receptors, which in turn tell the muscles in the iris to contract or expand." - Study Island
2. Solid sodium reacts with gaseous chlorine to produce sodium chloride.
how many molecules of water are in 1.8 moles of water
The number of molecules in given amount of water is 10.8396 x 10 by the 23 power.
why does water have the highest intermolecular forces
Answer:
Water has polar O-H bonds. The negative O atoms attract the positive H atoms in nearby molecules, leading to the unusually strong type of dipole-dipole force called a hydrogen bond.
Explanation:
The oxidation state of Mn2
What is the main form of energy represented by each of the following?
Oxygen bonds with carbon
1) chemical energy
2)potential energy
3)kinetic energy
4)thermal energy
Answer:
chemical energy is your correct answer mark me brainly
what is a matter and how do it work?
Answer:
Matter is any substance that has mass and takes up space. Any physical object consists of matter. It doesn't matter whether it's an atom, element, compound, or mixture. It's all matter. (Not a pun, i promise ツ)
However, unlike some believe, not everything you encounter in the world is matter. Matter can be converted into energy, which has neither mass nor volume. So, light, sound, and heat are not matter. Most objects have both matter and some form of energy, so the distinction can be tricky. For example, a candle flame certainly emits energy (light and heat), but it also contains gasses and soot, so it is still matter. The building blocks of matter are called "atoms" and "molecules." They, too, are matter. The matter we can detect normally is called "baryonic" matter. However, there is another type of matter out there, which can't be directly detected. But its influence can. It's called dark matter.
Attached below is a picture of examples of matter.
Key words and phrases:
matter, heat, light, dark matter, baryonic matter, sound, energy, mass, volume, space, physical
Hope this helps! Brainliest would be much appreciated! Have a great day! :)
Which best explains why a crystal is incompressible?.
Answer:
There is little if any, space left between its adjacent molecules.
Good luck!
I need help name the parts of making up the female part of the flower and state what each part does. ( answer in your own unique words don’t copy and paste from the internet )
The female part is the pistil. The pistil usually is located in the center of the flower and is made up of three parts: the stigma, style, and ovary. The stigma is the sticky knob at the top of the pistil. It is attached to the long, tube like structure called the style.
Hope It Will Help You !Identify the section in which each type of information can be found on a Safety Data Sheet.
recommendations in case of accidental contact with the chemical Choose...
chemical name and formula Choose...
possible dangers and health effects Choose...
incompatibility or reactivity with other chemicals Choose...
recommended personal protective equipment (PPE) Choose...
Recommendations in accidental contact >> First Aid Measures; chemical name >> Identification: possible dangers >> Hazards Id.; incompatibility >> handling; PPE >> Exposure Controls.
Chemical hazards and recommendationsChemical hazards are different types of chemical substances capable of causing harm to human health.
The First-Aid Measures are a series of recommendations on how to minimize the effects caused by accidental exposure to a given chemical hazard.
Personal protective equipment (PPE) is a type of specially designed equipment that protects an employer against safety risks during work.
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what does the name cambrian period mean?
Answer:
the first geological time period of the Paleozoic Era
Explanation:
According to Newton's Second Law of Motion, why would you not want to drive a regular car during a race on a racetrack?
Answer:
According to Newton's first law of motion, it is the natural tendency of all moving objects to continue in motion in the same direction that they are moving ... unless some form of unbalanced force acts upon the object to deviate its motion from its straight-line path. Moving objects will tend to naturally travel in straight lines; an unbalanced force is only required to cause it to turn. Thus, the presence of an unbalanced force is required for objects to move in circles.
Explanation:
What is gravitational energy? Please help.
Answer:
When falling. Such as dropping an item, or tripping over a banana peel!
Explanation:
Gravitational potential energy is the energy stored in an object as the result of its vertical position or height. The energy is stored as the result of the gravitational attraction of the Earth for the object.
Explanation:
hope this helps you
help plz 50 points <3
Answer:
I believe the answer is the last one answer D: Neutral elements
Explanation:
Ionic bonds are formed through the exchange of valence electrons between atoms, typically a metal and a nonmetal. ... Ionic compounds are typically neutral. Ionic compounds generally form between elements that are metals and elements that are nonmetals.
Hope this helps please mark brainliest :)
Answer:
i got a new padlit
Explanation:
What reason best explains why hydrogen is placed in group 1
Answer:
Hydrogen is placed in group one (non-metals) because hydrogen is not a metal. It is a highly reactive gas. It has the lowest atomic mass, and belongs with the gases in group one.
Explanation:
What is the general equilibrium expression for an acid?
Answer:
"An equilibrium constant expression describes the relationship among the concentrations (or partial pressures) of the substances present in a system at equilibrium" (General Chemistry). ... For this example, Ka = 2.2 x 10-4 and the initial concentration of HA, the acid in solution is 2 mol L-1.
What is added to make solid ice change to liquid water and then to gaseous steam.
Answer: heat
Explanation: if solid ice is heated it becomes in liquid and then to gaseous steam.
How many grams of magnesium would you have in 2.5 moles?
Answer:
there is 60.7625 grams of magnesium
Answer:
Explanation:
1 mol of magnesium = 25 grams (correct this with the periodic table you were given.
2.5 mols = x grams
1/2.5 = 24/x Cross Multiply.
x = 2.5 * 24
x = 60 grams Remember to correct the 24 with the mass given with your periodic table.
For the reaction: 2H2O → 2H2 O2, what is the total number of moles of O2 produced from the complete decomposition of 8 moles H2O?.
The complete dissociation of 8 moles of water produces 4 moles of oxygen.
The moles of reactants and products in the chemical reaction corresponds to the whole number representation of the stoichiometric coefficient in the balanced chemical equation.
Computation for moles of oxygen producedThe balanced chemical equation for the reaction is:
[tex]\rm 2\;H_2O\;\to\;2\;H_2\;+\;O_2[/tex]
From the balanced chemical equation, dissociation of 2 moles of water produces 1 mole of oxygen.
The moles of oxygen produced by 8 moles of water are:
[tex]\rm 2\;mol\;H_2O=1\;mol\;O_2\\\\8\;mol\;H_2O=\dfrac{1}{2}\;\times\;8\;mol\;O_2\\\\ 8\;mol\;H_2O=4\;mol\;O_2[/tex]
The moles of oxygen produced from 8 moles of water is 4 moles.
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A combustion reaction occurs between one molecule of methane (CH4) and two molecules of oxygen (O,)
A 1 carbon, 4 hydrogen, and 2 oxygen
B 1 carbon, 4 hydrogen, and 4 oxygen
C 1 carbon, 1 hydrogen, and 1 oxygen
D 1 carbon, 1 hydrogen, and 2 oxygen
Answer:
D
Explanation:
Because I carbon atom and 1 hydrogen atom plus 2
Oxygen atoms are needed
What mass of zinc contains the same number of atoms as 500.0 g of gold?
Answer:
166 g of Zinc
Explanation:
First calculate moles of Gold.
Moles = Mass / M.Mass
Moles = 500 g / 196.96 g/mol
Moles = 2.54 mol
Secondly, calculate mass of Zinc using moles of Gold.
Mass = Moles × M.Mass
Mass = 2.54 mol × 65.36 g/mol
Mass = 166 g of Zinc
what volume of a pure liquid (density 0.860 g/ml) has a mass of 0.360 kg?
Answer:
0.418ml
Explanation:
Density=Mass/Volume
By making Volume the subject of The formula=
Volume=Mass/Density
V=0.360/0.860=0.418ml
Consider the reaction 2SO2(g) O2(g) Right arrow. 2SO3(g). Substance Delta. Hf (kJ/mol) S (J/(molmc021-3. JpgK)) SO3(g) –396 130. 58 SO2(g) –297 191. 50 O2(g) 0 205. 00 What is the Delta. Grxn of this reaction, and would it be spontaneous or nonspontaneous at 300. 0 K? Use Delta. G = Delta. H – TDelta. S. –296 kJ/mol, spontaneous –296 kJ/mol, nonspontaneous –100 kJ/mol, spontaneous –100 kJ/mol, nonspontaneous.
The reaction has [tex]\Delta G[/tex] value of -296 kJ/mol, and the reaction is spontaneous. Hence, option A is correct.
The value of [tex]\Delta G[/tex] for the reaction is the change in the free energy. The [tex]\Delta G[/tex] for the reaction is calculated as:
[tex]\Delta G=\Delta H-T\Delta S[/tex]
Computation for [tex]\Delta G[/tex] of the reactionThe given reaction is:
[tex]\rm 2\;SO_2\;+\;O_2\;\to\;2\;SO_3[/tex]
The change in enthalpy and entropy is given by the difference in product and reactant.
Thus, the change in free energy is given as:
[tex]\Delta G=(\Delta H_{product}-\Delta H_{reactant})-T(\Delta S_{product}-\Delta S_{reactant})\\\\\Delta G=(2(\Delta H_{SO_3})-(2(\Delta H_{SO_2})\;+\;\Delta S_{O_2}))-T((2(\Delta S_{SO_3})-(2(\Delta S_{SO_2}))[/tex]
Substituting the values in the above equation at a temperature of 300 K.
[tex]\Delta G=(2(-396)-(2(-297)\;+\;(0)))-300\;(2(130.58)-(2(191.50)+(205)))\\\Delta G=(-792-(-1386))-300\;(261.16+588)\\\Delta G=-296\; \rm kJ/mol[/tex]
The negative value of [tex]\Delta G[/tex] represents the reaction to be spontaneous.
Thus, the reaction has [tex]\Delta G[/tex] value of -296 kJ/mol, and the reaction is spontaneous. Hence, option A is correct.
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Sakura tested the pH of several solutions. Which substances are acidic? Check all that apply. Cola-flavored soda: 2. 6 cranberry juice: 2. 9 dish soap: 7. 3 pickle juice: 5. 5 seawater: 8. 0 lye soap: 13. 0.
Cola-flavored soda: 2. 6 -Acidic
cranberry juice: 2. 9 -Acidic
dish soap: 7. 3 -Basic
pickle juice: 5. 5 -Acidic
seawater: 8. 0 -Basic
lye soap: 13. 0. -Basic
What is pH?pH value tells us about the acidity and basicity of any solution. pH means potential hydrogen.
The pH scale is counted from 0 to 14 in which 7 is neutral and the value of pure water.
Below 7 are all acids and the above 7 are all basic.
Thus, all acidic substances are Cola-flavored soda: 2. 6, pickle juice: 5. 5, cranberry juice: 2. 9.
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What is electric current
Answer:a movement of positive or negative electric particles (such as electrons) accompanied by such observable effects as the production of heat, of a magnetic field, or of chemical transformations — compare alternating current, direct current, displacement current.
Explanation:
Students were asked to determine if the two slides are taken from plants or cells taken from animals
Answer: taken from plants
Explanation:
because
