Answer:
The solar nebula spun faster and faster and flattened into a rotating disk. Most of the gas was pulled toward the center, where it became hot and dense, forming the Sun.
Explanation:
which of the following is an example of how research into the effects of a chemical has changed how it is used
Answer: Finding out that asbestos is dangerous and limiting its use in building materials
Explanation:
An automobile achieves a gas mileage of 24.5 mi/gal. How many kilometers can it travel on 1.5 L of gasoline?
Select the correct answer. Which factor causes water to form small drops on a waxy surface? A. van der Waals forces B. hydrogen bonding C. London dispersion forces D. ionic bonding
Answer:
B. hydrogen bonding
Explanation:
Waxy surfaces are non-polar while also water is polar. There is a difference in electronegativity between the atoms O and H, in which O is more electronegative than H. Such a difference in electronegativity causes the two covalent O-H bonds to become polar in water, where O atom has a partial negative charge, and the H atom has a partial positive charge.
Therefore from the above explanation the correct answer is B
A buret is used to dispense standardized NaOH solution. The initial buret reading is 2.73 mL, and after dispensing a known volume of NaOH the buret reading is 15.67 mL. If the concentration of the NaOH is 0.125 M, how many moles of NaOH were dispensed
Answer:
1.62x10⁻³ moles of NaOH were dispensed
Explanation:
Molarity is an unit in chemistry defined as the ratio between moles of solute (In the problem, NaOH), per liter of solution.
The concentration of the solution is 0.125moles per liter. That means 1L of solution has 0.125 moles of NaOH.
The volume you dispensed in the buret was:
15.67mL - 2.73mL =
12.94mL of the 0.125M NaOH are:
12.94mL = 0.01294L * (0.125moles / L) =
1.62x10⁻³ moles of NaOH were dispensedWhich statement describes all chemical changes, but not all physical changes? Bubbles are produced. A new substance forms. Phase changes occur. A color change occurs.
Answer:
A new substance forms
Explanation:
A chemical change is a change in matter that results in a change in its identity and properties. Therefore, a new substance forms.
Answer:
b
Explanation:
Supón que se ha descubierto una nueva especie de organismo. Los científicos observan sus células en un microscopio y determinan que carecen de mitocondrias. ¿Qué tipo de respiración celular crees que cumple la nueva especie? Explica tu respuesta . Un cuerpo humano trabaja en armonía. Desde la célula hasta los sistemas, cada parte cumple una tarea que hace posible el funcionamiento del cuerpo. ¿Qué otro ejemplo puedes encontrar de trabajo en armonía en el funcionamiento de tu cuerpo?
Answer:
Respiración anaerobica
Explicación:
Las nuevas especies carecen de mitocondrias, por lo que realizan respiración anaeróbica porque en las mitocondrias solo ocurre la respiración aeróbica mientras que la respiración anaeróbica ocurre en el citoplasma de la célula. Trabajar en armonía es muy importante para el funcionamiento normal de su cuerpo. Por ejemplo, el funcionamiento combinado del sistema circulatorio y excretor. ambos sistemas hacen su trabajo mutuamente y por eso hay armonía en el cuerpo.
The group in an experiment that is not exposed to the tested variable is called the group
Answer:
yes your answer is correct for this question.
Is it possible to attract death? If so, how and why?
Answer:
Yes
Explanation:
If you are prone to accidents or you don't pay attention, you are more likely to die. When you don't pay attention, you could walk across the street and forget to look both ways. A car would hit you, and potencialy kill you, if it runs a red light or if you walk when the light is green.
HELP PLEASE !!!!! which of the following molecules has a bent shape
Answer:
A
Explanation:
APEX
The sulfur dichloride has bent shape.
i.e, option A is correct one.
What is shape of the molecule?The three dimension (3D) representation of molecule by excluding lone pair of electron is called shape of the molecule.
The geometry and shape of the molecule is determined by using some theories like valence bond theory, hybridization and VSPER theory.
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Lithium has a 1+ charge, and oxygen has a 2− charge. A Lewis dot diagram should contain one lithium atom and two oxygen atoms to show how these atoms form an ionic bond. true or false
Answer:false
Explanation:
i took the test
name the harmful by products formed by the burning of diesel and coal
Burning of diesel and coal produces a suffocating and corrosive gas-Sulphur dioxide gas, and Petrol engines give off gaseous oxides of nitrogen. Oxides of these sulphur and nitrogen dissolves in rain water and causes Acid Rain
Answer:
Burning of coal and diesel release sulphur dioxide gas. It is an extremely suffocating and corrosive gas. Sulphur dioxide and nitrogen oxide dissolve in rain water to form acid. Such rain is called acid rain.
Explanation:
which surface has most friction
A glass container has a volume of 42.122cm^3. A lead sphere of radius 2.102 cm is placed inside the glass container. How much water must be added to exactly fill the container with the lead sphere sitting at the bottom of the container?
Answer: 32.9345 cm^3
Explanation:
The volume of the water that must be added to exactly fill the container with the lead sphere sitting at the bottom of the container will be 3.222 cubic cm.
What is volume?Volume is defined as the space occupied by any solid object in the three-Dimensions. For the sphere, the radius will be the parameter to calculate the volume. For a cylindrical body, the height and the radius are required to calculate the volume.
Given that A glass container has a volume of 42.122cm³ A lead sphere of radius 2.102 cm is placed inside the glass container.
To calculate the volume of the water calculate the volume of a lead sphere and subtract it from the volume of the cylindrical container.
Volume of lead sphere = ( 4 / 3 )πr³
Volume of lead sphere = ( 4 / 3 ) x π x ( 2.102)³
Volume of lead sphere = 38.90 cubic cm
Amount of water to fill in the container:-
= ( Volume of container - Volume of the lead sphere )
= 42.122 - 38.90
= 3.222 cubic cm
Therefore, the volume of the water that can be filled in the container will be 3.22 cubic cm.
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I) Do both the cyclists start at the same point? If not, who is ahead at the starting point? ii) At t = 7s, which cylclist is lagging behind? iii) Which cyclist – A or B would be travelling with greater speed? How can you justify?
Answer and Explanation:
Assuming the image attached is the distance/displacement-time graph of both cyclists A and B:
Cyclist B started at a position higher than 0 meters, whereas cyclist A started at 0 meters. Cyclist B started ahead.When t = 7, it s observed that cyclist A is at a higher position on the graph than cyclist B, and is therefor travelling faster. B is lagging behind.Cyclist A is travelling at a greater speed, because his distance covered is exponentially increased per time, whereas the Cyclist B only records marginal steady increase in distance covered.I hope this explanation was easy to understand and helpful.
Which statement correctly describes compounds?
Answer:
A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means. A compound is not a pure substance because it is not an element, and only elements are pure substances.
Magnesium hydride of mass 0.0348g was dissolve in 15cm cube of water to form a solution .a. write a balanced equation for the reaction
Answer:
It looks like there aren't any great matches for your search
Tip: Try using words that might appear on the page you’re looking for. For example, "cake recipes" instead of "how to make a cake."
To find density of an object what 2 things are needed?
Answer: mass and volume
Explanation:
Divide the mass by the volume in order to get an object's Density.
Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?
Answer:
solubility
Explanation:
Solubility is the ability of a solid, liquid, or gaseous chemical substance (referred to as the solute) to dissolve in solvent (usually a liquid) and form a solution. The solubility of a substance fundamentally depends on the solvent used, as well as temperature and pressure.
hope it helps :)
please mark it the brainliest!
Answer:
Solubility
Explanation:
just in case
What defines the mass number of an isotope? the sum of the neutrons and protons the sum of the neutrons and electrons the number of neutrons the number of protons
Answer:
The mass number of an isotope is the sum of neutrons and protons.
Explanation:
In any elemental isotope, the only things that will affect molar mass and mass number is the number of protons and neutrons. Electrons are not counted because we usually assume they are equal to the amount of protons and have no weight.
Protons are what gives the element its atomic number and the neutrons determine the type of isotope it is within the element.
For instance:
There can be a regular Carbon - 12
But there are isotopes like Carbon - 13 and Carbon - 14.
*The number of protons stays the same but the number of neutrons are different
What is the percentage of water in the following compound? Answer using three significant figures. Sodium carbonate decahydrate, Na2CO3 • 10H2O % by mass H2O
Answer:
63% (Or any value you get that can round to this percentage)
Explanation:
First, you will need to collect various values such as molar mass to start off this question.
The molar mass of sodium carbonate is 106g per mole. You can find this value with your provided molar mass sheet within your respective textbook or by simply searching this value up on the Internet. The coefficient of sodium carbonate is 1 (since there is no value shown for the coefficient), so the mass of sodium carbonate will be 106g.
The molar mass of water is 18.01g per mole, so this means that the mass of water here will be 180.1g since the coefficient of H2O is 10, and 10*18.01g/mole is 180.1g.
Now, you will need to add the masses of both substances together.
106g + 180.1g = 286.1g
The mass of water is 180.1g so...
180.1g / 286.1g = 0.6295
Because we need a percentage for the answer, you will need to convert the decimal into a percentage.
0.6295 => 63% (The answer!!!)
Answer:
63.0% on edge
Explanation:
Which statement is most likely true?
Ernest Rutherford’s experiment led to the nuclear model of the atom.
Ernest Rutherford’s experiment established the plum pudding model of the atom.
Robert Millikan’s postulates form the most accepted theory for the atomic structure.
Robert Millikan’s results had little impact on determining of the charge of an electron.
Answer : Option A) Ernest Rutherford’s experiment led to the nuclear model of the atom.
Answer:
A: Ernest Rutherford’s experiment led to the nuclear model of the atom.
Explanation:
The simplest substances on Earth are called ________.
Answer:
elements
because There's no fourmals of 2 subsances that can make up an element
Answer:
Elements
Explanation:
G.O.O.G.L.E.
If you have a graduated cylinder containing 15.50 mL of water and this volume changes to 17.97 mL after a metal with a mass of 17.95 g is dropped into the graduated cylinder, then what is the density of this metal?
Answer:
Explanation:
density = mass / volume
mass = 17.95 grams
volume = 17.97 - 15.50 mL = 2.45 mL = 2.45 cc
density = 17.95 /(2.45) = 7.327 grams / cc
O Math
1 point
The
Is a process that uses evidence and logic to learn about
the natural world,
O observational method
experimental method
hypothetical method
O scientific method
Answer:
D). Scientific method.
Explanation:
'Scientific research method' is described as the method of research that 'employs evidence as well as logic to learn about the natural phenomenon and world.' An observation is made at first, then sufficient data is gathered to formulate a theory or hypothesis and its validity is tested and the results are interpreted. The careful observation is logically tested and justified by testing the accuracy through appropriate evidence. It helps in reaching more authentic conclusions and hence, option D is the correct answer.
Convert 0.0035 weeks into seconds.
Answer: 2116.8 seconds
Explanation:
0.0035 weeks × 7days/week × 24hrs/day × 60min/hr × 60sec/min
=2116.8 seconds
=2100 (if you are required to consider significant figures)
molar mass of acetone(CH3COCH3)
Answer:
58.09 g/mol
Explanation:
To find the molar mass, add together the atomic masses of all the elements in the compound.
C - 3 × 12.01 = 36.03
H - 6 × 1.01 = 6.06
O - 16.00
36.03 + 6.06 + 16.00 = 58.09 g/mol
The molar mass of acetone is 58.09 g/mol.
Hope that helps.
Briefly define correlation
Answer:
Correlation means association - more precisely it is a measure of the extent to which two variables are related. There are three possible results of a correlational study: a positive correlation, a negative correlation, and no correlation.
Explanation:
PLS MARK BRAINLIEST
Answer:
a mutual relationship or connection between two or more things.
Explanation:
"research showed a clear correlation between recession and levels of property crime"
Which element has the smallest atomio radius?
what are 2 differences between the atomic theory described by Thompson and that described by Rutherford ?
Explanation:
1)Thomson model, electrons are embedded in positive charged solid material(nucleus)
Rutherford model, electrons surround the positive charged nucleus
2)Thomson, does not explain about atomic nucleus
Rutherford, explains in detail about nucleus
a plant only requires the correct chemicals to make plant food ture or false
Answer:
Your correct answer is true.
Explanation:
A plant only requires the correct chemicals to make plant food. ( True )