A car slows down as it approaches a traffic light, it will be Negative acceleration.
what is acceleration ?Acceleration is a vector quantity and it has both magnitude and direction, a second derivative of position with respect to time or first derivative of velocity with respect to time.
It is simply defined as the change in the velocity of an object which is called acceleration, here Velocity is a vector quantity with both magnitude and direction.
So acceleration can also be defined as a change in the direction or speed of an object. for example, while driving a car and pressing the accelerator makes the car go faster.
acceleration(a)= final velocity(v) –initial velocity(u) time(t)
If the velocity at the beginning was ‘u′, and the increased to velocity, ‘v′, after "t" time .
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is sodium hydroxide dissolves in water a physical change
Which statement best describes the difference between a physical change and a chemical change
The best statement describing the difference between a physical change and a chemical change is that a physical change involves a change in the state of matter, while a chemical change results in forming a new substance. Correct option is: B.
The difference between a physical change and a chemical change can be best described with the following statement:
B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.Physical changes involve changes in the state of matter (e.g., ice melting into water, water evaporating into steam) without altering the chemical composition of the substance.
On the other hand, chemical changes involve breaking and forming chemical bonds, resulting in the formation of new substances with different chemical properties (e.g., hydrogen and oxygen reacting to form water).
Examples of physical changes include melting, freezing, condensation, and evaporation. Examples of chemical changes include combustion, oxidation, and reactions that produce gas or precipitate.
Complete Question: -
Which statement best describes the difference between a physical change and a chemical change?
A. A chemical change results in a new element being formed, and a physical change results in a new compound being formed.
B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
C. A chemical change does not result in a new substance being formed, whereas a physical change does.
D. A physical change produces a new element, and a chemical change results in a bond breaking between atoms.
which of these id an indication that a chemical reaction has occurred?
A) formation of a gas
B) boiling of a substance
C) melting of a substance
D) freezing of a substancd
how do atoms form a new substance
What characteristic of the molecule is important for this force to be effective in bonding?
Answer:
Van der Waals forces' is a general term used to define the attraction of intermolecular forces between molecules. The bigger the molecule, the bigger the force.
Explanation:
What is the difference between a terrestrial planet and a gas giant
Gas Giants are usually bigger than Terrestrial Planets. Gas Giants also have thicker atmospheres, and have gaseous surfaces. Terrestrial planet tend to be smaller, and have solid surfaces. In our solar system, Mercury, Venus, Earth (home), and Mars are Terrestrial planets. While Jupiter, Saturn, Uranus (the planet), and Neptune are Gas Giants. Gas Giants are also known as Jovian planets.
Within each biome how can the environment be organized into levels from complex to simple
Final answer:
Ecological organization ranges from the biosphere to biomes, ecosystems, communities, populations, and individuals. Biomes are large-scale environments with specific climates affecting vegetation and wildlife, organizing life in nested hierarchies.
Explanation:
In ecology, the environment can be organized into nested ecological hierarchies which, from the most complex to the simplest, are as follows: the biosphere, biome, ecosystem, community, population, and individual. The biosphere encompasses all living beings and all of their environments on Earth.
A biome is a large-scale environment, categorized primarily by characteristic vegetation and climate, and consists of many ecosystems. Each ecosystem includes a community and its non-living environment. Within an ecosystem, a community represents the sum of all living organisms residing in the same area.
This includes many populations, which are groups of individuals of the same species living in an area. Lastly, the individual is a single organism, the most basic unit in ecological organization.
Different biomes on Earth range from tropical rainforests to Arctic tundra, each distinguished by unique temperature ranges and precipitation patterns which influence the vegetation and animal life suited for those conditions.
Which layer of earth atmosphere contains no water vapor, has an atmospheric pressure less than 0.1 atmosphere, and has an air temperature that increases with altitude?
The table lists the chemical formulas or symbols of a few common substances. Which two substances are compounds? A) aluminum and iron B) iron and sodium chloride C) carbon dioxide and aluminum D) sodium chloride and carbon dioxide
Each elements, molecules and compounds have their own formula to identify them. The two compounds in the given lists are sodium chloride and carbon dioxide.
What are compounds?Compounds are chemical substances formed by the combination of two or more different elements. For example water is a compound formed from two hydrogens and one oxygen atom.
Combination of same atoms forms molecules but not compounds. Sodium, iron, aluminum ets are single atoms and not compounds. There are different types of compounds such as ionic compounds, covalent compounds, coordination compounds etc.
The compounds are classified based on their bond type, composition etc. sodium chloride (NaCl) os an ionic compound of sodium and chlorine. Similarly carbon dioxide is a covalent compound formed from carbon and oxygen atoms.
Hence, the two compounds in the given lists are sodium chloride and carbon dioxide.Thus, option D is correct.
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What is the empirical formula for a molecule containing 46.8% Si and 53.2% O?
Answer:
SiO2
Explanation:
a p e x
What best describes the degree to which a material can transmit Heat A:melting point B:boiling point C: thermal conductivity D: electrical conductivity
What is the difference between Spring Water and Alkaline water ?
A laboratory manual gave precise instructions for carrying out the reaction described by the chemical equation, C2H6O + O2 C2H4O2 + H2O. It stated that if you bubble oxygen gas through a solution containing the reactant for 24 hours then the yield of C2H4O2 would be 7.50% of the theoretical amount. If you desire to produce 700. grams of the C2H4O2 in a single batch, how many kg of C2H6O should you begin with?
which scientific tools are used by life scientists
Which expression of distance uses SI units?
A.
30 miles
B.
16 kilograms
C.
24 feet
D.
500 meters
SI stands for International system of units. Metre is a conventional unit of measuring distance.
Thus, option D is correct.
What is SI unit?The International system of units contains the base units for quantifying any object, quantity or a substance. The standard unit for measurement is the same world-wide.
It remains unchanged and is accepted universally. SI units remains the same in any language, in any field or area and in any condition.
SI unit is taken as the quantity of need. Any derived values are not included in SI units.
There are seven standard units included in SI system. SI units are devised for measurement of time, mass, length, temperature, current etc.
Using SI unit for measurement provides accuracy and consistency. The problem could be viewed in one dimension by all and thus solved appropriately with standard measurements.
Therefore, SI unit forms a fundamental unit for quantification in metric system.
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After you add water to the sand-salt mixture what happens when you pour it through a filter??
The following neutral atoms each have 8 places for electrons in their outermost shells.
Which atom will tend to lose rather than gain 1 or more valence electrons when forming an ion?
a. Li with 1 valence electron
b. O with 6 valence electrons
c. Ne with 8 valence electrons
d. F with 7 valence electrons
Answer:
a. Li with 1 valence electron
Explanation:
For this it is necessary to see the electronegativity of this atoms. The electronegativity is the force or tendency that has an atom to attract electrons, so the atom who has the lower value of electronegativity is the one that will tend to lose rather than gain electrons.
The electronegativity of these atoms is:
Li – 0.98
O – 3.44
F – 3.98
Ne is a noble gas so has no tendency to gain nor lose electrons
True or false forces on earth are different from those elsewhere in the universe
Why is it hard to prove the law when a gas is produced?
Chemical reactions occur when the starting materials called the reactants rearrange their electrons to create new bonds. It is very difficult to prove the law of conservation of mass in the case of gases.
What is law of conservation of mass?According to the law of conservation of mass, mass can neither be created nor be destroyed. It can be converted from one form to another. The law of conservation of mass says that the mass of reactants must be equal to the mass of products.
The gas molecules move quickly into the outside space and away from the system. When a gas is produced, it quickly diffuses away from the site of synthesis making it difficult to measure the mass of the products.
So the law of conservation of mass cannot be proved in the case of gases. Randomness is found to very high in gas molecules, so that the measurement of mass is difficult and could not be accurate.
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which element is most reactive sodium,magnesium, or aluminum and why?
Formula Mass for AgNO2
The formula mass of AgNO₂ is approximately 153.88 amu.
To calculate the formula mass for AgNO₂, add the atomic masses of silver (Ag), nitrogen (N), and oxygen (O). Silver has an atomic mass of 107.87 amu, nitrogen is 14.01 amu, and oxygen is 16.00 amu. Since there is one nitrogen atom and two oxygen atoms in nitrite (NO₂), you compute the mass of NO₂ by adding the atomic mass of nitrogen to twice the atomic mass of oxygen.
Formula mass of AgNO₂ = atomic mass of Ag + atomic mass of N + (2 × atomic mass of O)
= 107.87 amu + 14.01 amu + (2 × 16.00 amu)
= 107.87 amu + 14.01 amu + 32.00 amu
= 153.88 amu
Therefore, the formula mass of AgNO₂ is 153.88 amu.
The complete question is:
What is the formula mass of AgNO₂?
What happens to the speed of molecules in water vapor when it condenses to form a liquid?
convert 25 kilometers to meters
Justine observed that the water level in a dish placed on the window sill decreased after a few days, and vapor formed. What best explains that she observed a physical change? Vapor can be easily condensed back to form water. Water and its vapor react with substances in different ways. The molecular composition of water changed when the water level decreased. Bonds between hydrogen and oxygen broke when the water level changed.
yes the answer would be A. Vapor can be easily condensed back to form water. I know because I took this exam and had this question too.
Which of these is not a challenge an organism encounters
A neutral chlorine atom has 17 protons and 18 neutrons. How many electrons does it have?
A. 16
B. 17
C. 18
D. 19
(And if you want please explain how you get the answer.)
Answer : The correct option is, (B) 17
Explanation :
Atomic number is defined as the number of protons or number of electrons.
Atomic number = number of protons = number of electrons
Mass number is defined as the sum of number of protons and number of neutrons.
Number of neutrons = Mass number - Number of protons
As we are given that:
Number of protons in chlorine atom = 17
Number of neutrons in chlorine atom = 18
For neutral atom :
As, Atomic number = number of protons = number of electrons
So, Number of electrons in chlorine atom = Number of protons = 17
Hence, the correct option is (B) 17
who further developed Democritus's early contributions to the atomic theory by proposing that each chemical element has its own kind of atom?
Identify the compounds that can be deprotonated by −OH
The compounds that can be deprotonated by −OH are formic acid and hydrogen sulfide.
What is Deprotonation?Deprotonation may be defined as the process of elimination of a proton from a Bronsted-Lowry acid in an acid-base reaction. Deprotonation does not refer to the ejection or removal of a hydride ion (H-). The process of deprotonation actually removes a +1 charge from a chemical compound.
Formic acid (HCOOH) and hydrogen sulfide (H2S) is typically compound that can be deprotonated through the mechanism of deprotonation.
Such types of compounds are easily ionized in the forms of ions like HCOO- and H+. The deprotonation of such compounds is facilitated by the delocalization of protons to other instable form.
Therefore, the compounds that can be deprotonated by −OH are formic acid and hydrogen sulfide.
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nylon is a polymer which is termed as
Answer:
Nylon is named as the most useful synthetic material. Nylon belongs to a family of materials called "polyamides."
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How many newtons are necessary for a 6,000 g mass to accelerate at a rate of 2.5 m/s2.