Answer:
a
Explanation:
The force acting downwards or opposite to normal force which reduces the movement is indicated with a negative sign. Hence, the force of -7N is frictional force.
What is force?Force is an external agent acts on a body to change it from the state of rest or motion. There are various forces such as frictional force, magnetic force, gravitational force etc.
Frictional force is the resistive force which make the object resistive in motion. Thus it is indicated with a negative sign. Gravitational force is the force by which an object attracts other objects into its centre of mass.
Hence, gravitational force also making the body resistive to motion. Here, -10 N is the gravitational force acting on the box and it experience a force of -7N which also resists its force in the opposite direction of the normal force.
Hence, -7N is the force of friction acting on the body.
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3. Define isobar 75 points
Answer:
1.
meteorology A line drawn on a map or chart connecting places of equal or constant pressure.
2.
nuclear physics Either of two nuclides of different elements having the same mass number.
3.
thermodynamics A set of points or conditions at constant pressure.
Answer:
a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
Explanation:
L20_UENAxleFsh-VHfg9rLfZsitva3L3UKGjmF1B299/vie Settle a dispute. X Anya claims that this challenge can be solved with a single rotation. Braden says it can be solved with a single reflection Who is correct? Use the sketch tool if it helps you illustrate your thinking. Anya Braden Both Neither L S
Answer:
Neither arre correct
Explanation:
Neither Anya nor Braden are correct. This is because if you use 90 degrees, 180 degrees, or even 270 degrees you will not get the exact image, which means that the image will not be found by just a rotation because there will be a curve in the image. You can solve it if you can do 90 degree rotation and translation.
Which of the following statements best defines MATTER?*
a. species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties
b. the smallest particle of an element
c. a material formed by chemically bonding two or more chemical elements
d. the substance, or substances, of which any physical object is composed
e. a substance that cannot be chemically broken down into simpler substances
please this is timed
as the elements in period 2 of the periodic table are considered in succession from left to right , there is a decrease in atomic radius with increasing atomic number. this may best be explained by the fact that the--
Answer:
electons are added moving to the right
Explanation:
The decrease in atomic radius with increasing atomic number is best explained by the number of protons increasing and the number of shells of electrons remaining the same. Therefore, option (A) is correct.
What is the atomic radius?The atomic radius of an atom can be described as the size of the atom, which is generally the mean distance from the center of the nucleus to the outermost electron of an atom.
In the periodic table, as you move from left to right, the atomic number of elements in period 2 will continue to increase, because there is an increase in the number of protons which causes an increase in positive charge carried by each element while the number of shells of the electrons remains constant.
Therefore the Elements will attract more negative charges to themselves as we move from left to right in the period. As the atomic number of elements increases, there will be a decrease in the atomic radius of the elements.
Hence, the decrease in atomic radius with increasing atomic number is explained by the number of protons increasing and the number of shells of electrons in an atom remaining the same.
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Your question is incomplete most probably the complete question was,
As the elements in Period 2 of the Periodic Table are considered in succession from left to right, there is a decrease in atomic radius with increasing atomic number. This may best be explained by the fact that the
a. number of protons increases, and the number of shells of electrons remains the same
b. number of protons increases, and the number of shells of electrons increases
c. number of protons decreases, and the number of shells of electrons remains the same
d. number of protons decreases, and the number of shells of electrons increases
A _____ is flat land that is higher than the land around it.
A. plateau
B. plain
C. valley
D. canyon
Answer:
A
Explanation:
Answer:b
Explanation:
8 Dry ice has the same chemical properties as what gas? А Helium B. Hydrogen C Nitrogen D Carbon dioxide 8 of 10
Answer:
D. Carbon Dioxide
Explanation:
i may be wrong, but i believe its carbon dioxide
Dry ice has the same chemical properties as: D. Carbon dioxide.
A chemical property can be defined as the properties of a chemical compound (substance) that can be observed and measured during a chemical reaction.
Some examples of the chemical properties of a chemical compound (substance) are based on the following;
Acidity.Rusting.Tarnishing.Flammability.Reactivity.Basically, when dry ice experiences a phase change, it mainly transforms into carbon dioxide gas.
Hence, it is considered to have the same chemical properties as carbon dioxide such as:
I. Dry ice is an acidic oxide.
II. It has a high density.
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who thinks shrek is hot
Answer:
he aight but he best gurl
Explanation:
Answer:
meee he has a nice chinnnnnn
Identify the assumptions made as part of Dalton’s atomic theory.
Answer:
Matter has particles called atoms.
They are indestructible and unchangeable.
When chemical reactions occur, they combine.
Categorized by weight of atoms.
Explanation:
Answer:
Matter has particles called atoms. They are indestructible and unchangeable. When chemical reactions occur, they combine.
Explanation:
Earthquakes result from the buildup and rapid release of stress along active plate boundaries,
True
False
Which layer is found between the outer core and the crust?
A.atmosphere
B. ocean
C. mantle
D.core
Answer:
C mantle
Explanation:
Is sodium chloride acid,base or salt?
Answer:
it is salt
Explanation:
hope it helps
Most polyatomic ions will only contain
a. metal atoms
b. metal and non-metal atoms
c. neutral atoms
d. non-metal atom
Explanation:
oxygen and are negatively charged anions because the oxygen atoms attract electrons. Ammonium is one of the few positively charged polyatomic ions or cations and doesn't contain oxygen.
Answer:
non metal atoms
Explanation:
Lincoln learning test
help 6th grade science i will give brainliest FOOLISH ANSWERS WILL BE REPORTED
Answer: my answer would be B
Explanation: if you look at the graph and see the distance and time, you can match it to one of the answers. Hope this helps
Along each row of the periodic table,
A.
atomic mass increases from left to right.
B.
atomic mass is the same for all elements in the row.
C.
atomic mass changes in no set pattern.
D.
atomic mass decreases from left to right.
The pigment inside chloroplasts that allows photosynthesis to occur in plant cells what is it chlorine, mitochondria, chlorophyll or cytoplasm
Answer:
Chlorophyll
Explanation:
This is the green pigment that allows photosynthesis to occur
Mitochondria: cell energy
Cytoplasm: what fills the space between organelles in a cell
Chlorine: not sure but you they put it in pools
A student drops some metal paper clips in a box of sand. The student uses a magnet to separate the metal paper clips from the sand. The reason this works is that the sand and paper clips together are a
A) mixture.
B) element.
C) compound.
D) substance.
Answer:
compound
Explanation:
because now there are one together
Is rubber band stretching physical or chemical
Answer:
physical
Explanation:
this is a physical action to create a change. does not involve chemicals or elements
Answer:
[tex]\boxed {\boxed {\sf Physical \ change}}[/tex]
Explanation:
A chemical change, as the name suggests, must result from a change in the chemical makeup and new substances are produced. A very common example is metal rusting.
A physical change can be observed without a change in chemical composition. No new substances are produces. Ripping paper and an ice cube melting are physical changes.
A rubber band stretching is a physical change. No new substances are made and the chemical makeup remains the same.
Identify the type of reaction: 2Ag + Cl2 --> 2AgCl
A. decomposition
B. double replacement
C. single replacement
D. combustion
E. synthesis
Answer:
The answer is E ( synthesis)
To find S, the number of shared
electrons, recall that
S = N-A
What is S for CIO3, the
chlorate ion?
Answer:
It’s 6 :)
Explanation:
When chemical W is added to a liquid, the chemical breaks down into substances X, Y, and Z. It is not possible to break down substances X, Y, and Z into simpler substances. What conclusion is supported by this evidence?
Chemical W is an element.
Chemical W is a pure substance.
Substances X, Y, and Z are elements.
Substances X, Y, and Z are compounds.
Answer:
Chemical W is a pure substance
Explanation:
We can conclude that the substance W is a pure substance. Matter on a broad basis can be classified as either pure or distinct substance and impure substances (mixtures).
Pure substances are elements and compounds. All the parts are homogenous. They have a definite composition. They cannot be split by physical means.So, since we can only split the substance into elements X, Y and Z with no simpler units, W is a compound and a pure substance.
What is the molecular geometry for POI3?
Answer:
The correct answer is tetrahedral
Explanation:
Molecular geometry can be described as the three dimensional structure of atoms in a molecule. It is usually preferable to draw out the lewis dot structure of a compound before using that to determine the molecular geometry of the compound. The lewis dot structure and the tetrahedral structure of phosphoryl iodide (POI₃) are in the attachment below.
As it can be seen in the attachment, the molecular geometry of phosphoryl iodide is tetrahedral.
Which of the following best describes compounds?
А
They can only be separated chemically.
B
They are always liquid at room temperature.
С
They contain the atoms of just one element.
D
They have the same peperties as their elements.
a mutation occurs in a gene causing a pea plant produce 75% fewer leaves. this would be considered what kind of mutation?
a. positive
b. negative
c. neutral .
Answer:
negative
Explanation:
There is decrease of a character in the new progeny so it is negative mutation
Negative kind of mutation is occur in a gene causing a pea plant produce 75% fewer leaves.
What is mutation?If any chemical or physical alteration is occured due to change in the sequence of nucleotide in the DNA is known as mutation.
In plants mutation is natural phenomenon and as a result of mutation, different colors or shades on leaves and flowers are observed. Many other alteration is also noticed which may get normal in future. In the question it is given that due to mutation, pea plant produces 75% less leaves than the normal production.
Hence, in the pea plant negative mutation occurs.
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Kernels of corn are heated and become popcorn. Why is this a chemical change?
Answer:
When popcorn is popped, liquid inside the kernel is changed to steam. Pressure from the steam builds up inside the kernel. When the pressure reached a critical stage the kernel pops turning itself inside out. This is a physical change.
Explanation:
help me please i love you so much yes
Answer: When this occurs, the particles bind with the chemicals and form larger particles, the clear water on top will pass through filters of varying compositions (sand.
Explanation: I hoped that helped.
Which of the following trends can be observed when moving down a column in the periodic table
Explanation:
A column on the periodic table represents a period.
These are some of the variations observed across a period;
Atomic radii decreases progressively from left to right due to the progressive increase in the nuclear charge without an attendant increase in the number of electronic shells. Ionization energy increases progressively from left to right due to decreasing atomic radii. Electronegativity increases from left to right. Electropositivity decreases across a period.What is one advantage of using fossil fuels ?
Answer:
Advantages of fossil fuels:
Explanation:
One advantage of fossil fuels is that they are easy to find, they are also pretty efficient despite the pollution it causes, and lastly it provides tons of economic prosperity to many countries.
1) What is released during respiration?
O Energy
O Food
O
Air
O Glucose
During cellular respiration, glucose is broken down in the presence of oxygen to produce carbon dioxide and water. Energy released during the reaction is captured by the energy-carrying molecule ATP (adenosine triphosphate). Summary, Cellular respiration is the aerobic process by which living cells break down glucose molecules, release energy, and form molecules of ATP. Overall, this three-stage process involves glucose and oxygen reacting to form carbon dioxide and water.
How many molecules are present in 0.5 moles of NaOH?
The molar mass of NaOH is 40g, so 0.5mol is 20g
The molar mass of Na is 23g, O is 16g and H is 1g (total 40g), so in this case we have
Na 11.5g, O 8g and H 0.5g (total 20g)
The mole is represented by Avogadro's number, which is 6.022 × 1023 atoms or molecules per mol.
can someone like help me pls ✨
Answer:
C
Explanation:
It is c because that goes into heating and cooling and if nobody is home you should definetly turn off heating and cooling. This should be the correct answer.
