Answers
Answer:
1. The behaviour of molecules in different phases of matter represents a balance between the kinetic energies of the molecules and the attractive forces between them. All molecules are attracted to each other. At the same time, all molecules are in constant motion, and their kinetic energies increase with the temperature.
2. When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. ... Solids, liquids and gases all expand when heat is added.
Explanation:
Related Questions
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
Answers
(+1,+1, -2 =0)
(oxygen has 6 valence electrons, and needs two more to complete its octet and gain stability. 2 Lithium atoms donate their singular valence electron, leaving both with a formal charge of +1 and oxygen with a formal charge of -2. )
(An ionic bond is a bond between a nonmetal and a metal; in this bond, an electron is TRANSFERRED, not shared)
Answer:false
Explanation:
i took the test
Recording a change in the color of a substance is an example of collecting __________ data.
Answers
Answer:
Qualitative
Explanation:
Recording a change in the color of a substance is an example of collecting qualitative data.
Data generally refer to information collected or recorded through observations. There are different types of data:
Quantitative data: data that can be quantified/measured. Examples include; height, number of cars, intelligence quotient, etc.Qualitative data: Data that cannot be quantified but categorized or ranked. E. g. beauty, color, etc.Hence, recording a change in the color of a substance can be classified as collecting qualitative data.
which surface has most friction
Answers
An automobile achieves a gas mileage of 24.5 mi/gal. How many kilometers can it travel on 1.5 L of gasoline?
Answers
a plant only requires the correct chemicals to make plant food ture or false
Answers
Answer:
Your correct answer is true.
Explanation:
A plant only requires the correct chemicals to make plant food. ( True )
Briefly define correlation
Answers
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"
To find density of an object what 2 things are needed?
Answers
Answer: mass and volume
Explanation:
Divide the mass by the volume in order to get an object's Density.
Which statement describes all chemical changes, but not all physical changes? Bubbles are produced. A new substance forms. Phase changes occur. A color change occurs.
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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:
Convert 0.0035 weeks into seconds.
Answers
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)
The reaction between between common salt and concentrated tetraoxosulphate(vi) acid will liberate
A. sulphur (iv) oxide
B. oxygen and chloride
C. Hydrogen chloride gas
D. Hydrogen sulphide gas
Answers
most prolly option D
Explanation:
NaCl + H2SO4 -> Na2SO4 + HCl[g]
The reaction between between common salt and concentrated tetraoxosulphate(vi) acid will liberate Hydrogen chloride gas .
What is a Chemical reaction?
This is the type of reaction in which two or more elements/compounds react together to form a new substance.
The reaction between common salt and concentrated tetraoxosulphate(vi) acid can be seen below:
NaCl + H2SO4 ⇒ Na2SO4 + HCl(g)
Read more about Chemical reaction here https://brainly.com/question/11231920?source=archive
What is dimensional analysis? How is it used?
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Answer:
dimensional analysis is the way of converting different units. when you add two physical quantities or equate them they must be in same units.
uses:
to check the correctness of a physical formula
to convert the value from the one system to another.
to form a relationship between different physical quantities
HELP PLEASE !!!!! which of the following molecules has a bent shape
Answers
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.
To learn more about shape of the molecule here.
https://brainly.com/question/15651521
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246.24+238.278+98.3
Calculate to the appropriate number of significant figures
Answers
Answer:
The correct answer is 582.8.
Explanation:
To solve this problem, we must remember the rules for significant figures for addition. Recall that the answer should have the same number of decimal places as the term with the least number of decimal places that we are adding. In this case, we can see that out of our three terms, 98.3 has the least number of decimal places. This lets us know that our answer should be rounded to the tenths place.
With this in mind, we can compute the addition.
246.24 + 238.278 + 98.3
= 582.818 (unrounded value)
However, we stated that our answer should be rounded to the tenths place.
Therefore, our answer is 582.8.
Hope this helps!
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
Answers
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
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?
Answers
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.
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
Answers
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
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?
Answers
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
name the harmful by products formed by the burning of diesel and coal
Answers
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:
molar mass of acetone(CH3COCH3)
Answers
Formula: C3H6O
Melting point: -139°F (-95°C)
Density: 784 kg/m³
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.
Is it possible to attract death? If so, how and why?
Answers
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.
PLEASE HELP : what are 2 chemical and physical properties of a base and two chemical and physical properties of an acid?
Answers
Answer:
physical: color, appearance chemical: reactivity, flammability
Which statement correctly describes compounds?
Answers
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
Answers
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."
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
Answers
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 dispensed4. "The art of oration (speaking) is being
replaced by personal broadcasting." What does
this mean?
Answers
Answer:
People show more interest in personal broadcasting.
Explanation:
The art of oration (speaking) is being replaced by personal broadcasting mean now people used webcam or camcorder for creating its own content and transmit it to other people through internet. Personal broadcasting provides audio and video to the individual that make it more interesting as compared to oration. People show more interest in personal broadcasting as compared to oration so that's why oration is replaced by personal broadcasting.
Which element has the smallest atomio radius?
Answers
The group in an experiment that is not exposed to the tested variable is called the group
Answers
Answer:
yes your answer is correct for this question.
what are 2 differences between the atomic theory described by Thompson and that described by Rutherford ?
Answers
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
What is the percentage of water in the following compound? Answer using three significant figures. Sodium carbonate decahydrate, Na2CO3 • 10H2O % by mass H2O
Answers
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.
Answers
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: