Answers
1. B.
A typical atom is made up of three different particles, which are electron, proton and neutron. The proton and the neutron are located inside the nucleus of the atom while the electron orbit round the nucleus.
2. C
The number of proton in an atom determines the atomic number of that atom. Atom are positively charged particles and they do no participate in chemical reactions. The number of proton of an element remain constant at all time while the number of neutrons and the electrons in the atom may change.
3. B.
The first periodic table was created by Dmitri. He arranged the periodic table in such a way that, elements with similar properties fall into the same column in his periodic table. This was because, he arranged the periodic table on the basis of their physical and chemical properties.
4. A
The elements in the periodic table are arranged in horizontal row and vertical column. The column on the periodic table divides the elements into groups.
A row of element on the periodic table is called PERIOD. For elements on the same period, they have the same number of atomic orbitals.
5. A
Chemical symbol refers to the one or two letters which are used to represent a particular element. Chemical symbols are derived in a variety of ways. The chemical symbols make it possible for one to recognize an element quickly and to write it in an abbreviated form when writing chemical equations.
6. A.
An object is said to be ductile if it can be pulled into a long wire. It refers to an element's capacity to be pulled into a thin wire without the element been deformed. This is one of the properties of metals. Ductability makes it easier for one to work with a metal.
7. C
When metals atoms react with other atoms, the metal atoms lose electrons, this is because, metals usually have a low number of electrons in their outermost shells, which they always preferred to donate in order to achieve octet form.
8. B
Particle accelerator is a machine that accelerate elementary particles to very high energies, thus producing beam of charged particles which can be used for a lot of different purposes.
Related Questions
explain why a car with a large mass might use more fuel than a car with a smaller mass. Assume both cars drive the same distance.
Answers
A greater force is required to accelerate a more massive car, therefore, more engine power and fuel are needed.
Hope this helps :))
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answer these questions "type of heat transfer that occurs between the sun and venus" "measure of the average value of the kinetic energy of the molecules in a substance" "materials like aluminium pans and metal spoons that easily transfer heat" "measure of how well a substance absorbs heat" "type of energy that depends on how fast the molecules in a substance are moving" " temperature scale in which a reading of 0 equals the freezing point of water" "what does a doctor use to measure the average kinetic energy of the molecules in your body"
please please answer all of them and go in order
Answers
2) Not entirely sure what you mean but it is possible with this equation: KE = 3/2kT with k being the Boltzmann's Constant and T the temperature in Kelvins
3) True? Not really a question.
4) This would be emissivity
5) Thermal Energy
6) Celsius
7) A thermometer
Heat transfer from the Sun to Venus occurs via radiation, and the measure of molecular kinetic energy in a substance is temperature. Conductors like aluminium transfer heat efficiently, specific heat denotes a substance's heat absorption capacity, thermal energy depends on molecular motion, and a thermometer is used by doctors to measure body temperature.
The type of heat transfer that occurs between the Sun and Venus is known as radiation. This is the transfer of energy by electromagnetic waves, which does not require a medium to travel through space.
The measure of the average value of the kinetic energy of the molecules in a substance is called temperature. Higher temperatures correspond to higher average kinetic energy among the molecules of a substance.
Materials like aluminium pans and metal spoons that easily transfer heat are called conductors. These materials are efficient in transferring thermal energy through direct contact.
The measure of how well a substance absorbs heat is known as its specific heat. It is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
The type of energy that depends on how fast the molecules in a substance are moving is called thermal energy. Higher speeds of molecular motion correlate with higher thermal energy.
The temperature scale is which a reading of 0 equals the freezing point of water is the Celsius scale, also known as Centigrade.
To measure the average kinetic energy of the molecules in your body, a doctor would use a thermometer. The reading is a direct indication of your body's temperature.
is one liter about an ounce a pint a quart or a gallon
Answers
Answer:
A quart
Explanation:
The conversion of different units in litres is defined below:
The value of 1 gallon is equal to 3.78541 litres.The value of 1 pint is equal to 0.473176 litre.The value of 1 ounce is equal to 0.0295735 litre.The value of 1 quart is equal to 0.94635 litre.Therefore, by seeing the above point the 1 quart is approximately equal to 1 litre.
Does the sun give plants the nutrients to grow yes or no!!!
Answers
Answer:
yes it is
Explanation:
thankyou ii really need these points
Which is not a disadvantage of the use of solar energy. *
Answers
Hope I helped! :D
Which statement is accurate for these two sub-atomic particles. A) They both have a neutral charge. B) They both have a positive charge. C) They are both located in the nucleus. D) They are both located outside the nucleus
Answers
Answer:
C!Explanation:
A person drives 20 miles north and 45 miles east. What is the angle of the resultant straight to their destination?
Answers
tanθ = y / x
Substituting,
tanθ = 20/45 = 0.44
The value of θ is 23.96°.
What force is needed to give a 4.5-kg bowling ball an acceleration of 9 m/s2?
Answers
[tex]F = ma F = 4.5 x 9[/tex]
40.5 N
f=4.5*9
40.5 N
hope this help
How can the rate of a reaction be increased?
Answers
-Rate of reaction is the speed at which the reactants are converted to products.
-Rate of reactions depends on a number of factors which includes;
Concentration of reactants; increasing the concentration of reactants increases the rate of reaction. Temperature; An increase in temperature results to an increased rate of reaction. Increase in temperature increases the kinetic energy of molecules thus the collision per unit time also increases and hence the rate of reaction increases.Decreasing the size of particles of solid reactants also increases the rate of reaction. This is because smaller particles increases the surface area on which more collisions can occur thus a faster rate of reaction.Adding a catalyst also increases the rate of reaction. This is because catalysts lower the activation energy of reactants, minimum energy require by reactants for the reaction to take place. This thus increases the rate of reaction.Explanation:
There are many factors that are responsible for increasing the rate of reaction.
(1) Temperature: If the temperature increases, the kinetic energy of the molecules also increases. Hence, the collisions and ultimately the rate of reaction increases.
(2) The concentration of reactants: Higher the concentration, more will be the collision and hence more will be the rate of reaction.
(3) Pressure: Pressure is also directly proportional to the rate of reaction.
(4) Catalyst: Adding a catalyst increase the rate of reaction. Because it decreases the activation energy of the reactants. Hence, a small amount of energy is required by the reactants.
Hence, the above factors increases the rate of reaction.
a ____ agrees to help an immigrant become a citizen
Answers
Looking at this skier. If ht travels from point A to point B, then turns around and stops at point C, what is her total displacement?
A:180 m
B:320 m
C:100 m
D:40 m
Answers
Which of the following cools the air in a household refrigerator
Answers
What is the best explanation of the importance of the Eighth Amendment?
A. If people cannot talk about policies, they cannot change them.
B. People in the military should have the right to vote in elections.
C. People accused of a crime need to be treated fairly to preserve justice.
D. People need to have the ability to protect themselves and their homes.
Answers
Answer:
D
Explanation:
Hope it helps!
Which of the following statements correctly compares ultraviolet and visible light?
A. UV light has more energy than visible light
B. UV light has lower frequency than visible light
C. UV light has a longer wavelength than visible light
D. UV light has a smaller amplitude than visible light
Answers
Final answer:
UV light has shorter wavelengths and higher frequencies than visible light, resulting in more energy, which is why statement A is correct.
Explanation:
The question asks which statement correctly compares ultraviolet (UV) and visible light. The correct answer is A, which states that UV light has more energy than visible light. This statement is accurate because in the electromagnetic spectrum, UV light has shorter wavelengths and higher frequencies than visible light, both of which contribute to its higher energy levels. Unlike visible light, the higher energy of UV light can be enough to break chemical bonds, such as those in DNA, which can lead to cellular damage and is why it is often blocked by sunscreen and sunglasses.
What is acceleration?
a) the change of velocity over distance
b) the change of inertia over time
c) the change of velocity over time
d) the change of speed over time
Answers
C) The change of velocity over time
Final answer:
Acceleration is the rate of change of velocity over time. It is a vector quantity that can signify speeding up or slowing down and is measured in meters per second squared. So the correct option is c.
Explanation:
Acceleration is the rate at which velocity changes over time and can involve a change in speed, direction, or both. The formula for average acceleration is given by the change in velocity (∆v) divided by the time interval (∆t) over which this change occurs. It is important to note that acceleration is a vector quantity, meaning it has both magnitude and direction. Thus, acceleration can be positive (speeding up) or negative (slowing down, also known as deceleration). The SI unit for acceleration is meters per second squared (m/s2).
Therefore, the correct answer to the question 'What is acceleration?' is c) the change of velocity over time.
a 10 kg rock is suspended 320 m above the ground calculate the speed in which the rock hits the ground
Answers
Is the star with the longest total lifetime Also the farthest from earth? Explain.
Answers
Stars with the longest lifetimes are not always the farthest from Earth, as factors like mass and luminosity influence a star's lifetime independently of its distance from Earth.
No, the star with the longest total lifetime is not necessarily the farthest from Earth. Stars can have different lifetimes based on their mass and luminosity, which affect how fast they burn their fuel. Distance from Earth is independent of a star's lifetime, and factors like apparent brightness and luminosity can play a role in how we perceive a star's distance.
what speeds up condensation
Answers
Why is there diversity of life on Earth? A. so that young organisms can recognize their parents B. so that living organisms can survive and reproduce C. so that organisms create unique homes D. to encourage organisms to compete with each other
Answers
Hope this helps!
why did dalton devise his own element symbols
Answers
Final answer:
John Dalton created his own element symbols to visually represent the atoms and their combinations as part of his atomic theory. These symbols were crucial for the systematization of chemistry and preceded other symbol systems such as those of G. N. Lewis, which illustrate valence electrons and chemical bonding.
Explanation:
John Dalton, an English scientist, devised his own element symbols as part of his pioneering work in atomic theory. Dalton's atomic theory posited that elements are composed of indivisible atoms, that matter combines in fixed ratios, and that compounds always have consistent proportions. His element symbols, depicted in Dalton's book A New System of Chemical Philosophy, were an early attempt to represent these atoms and their combinations visually. These symbols laid the groundwork for the systematization of chemistry and were a precursor to later representations such as the Lewis dot symbols. Unlike Dalton's symbols, Lewis dot symbols focus on representing the valence electrons of atoms to predict chemical bonding and formation, as G. N. Lewis published in 1916.
Without Dalton's work, our understanding of the chemical composition of matter and the development of subsequent theories of chemical bonding, such as those proposed by G. N. Lewis, might have been significantly delayed. Dalton's dedication to empirical evidence and experimentation set his atomic theory apart from the philosophical ideas of ancient Greeks like Democritus and Leucippus, contributing greatly to the advancement of modern science and chemistry.
what is the answer to this problem
Answers
and also use conservation of mass
Assume elastic collision
m1v1 + m2v2 = m1V1 + m2V2
if we move things over and group like terms
m1(v1 - V1) = m2(V2 - v2)
m1 = 4kg
m2 = 1kg
v1 = 6.5m/s
v2 = 0
V1 = 4.8
V2 = ?
m1(v1 - V1) = m2(V2 - v2)
4(6.5-4.8) = 1(x-0)
(expand and group)
x = 6.8m/s
(Other ways to do this!)
The mass of an object is equal to its weight true or false?
Answers
It is false that the mass of an object is equal to its weight, as it is never the same.
What is mass?In physics, mass is a quantitative measure of inertia, which is a foundational element of all matter.
It is, in effect, the opposition that a body of material provides to a change in its pace or position when a force is applied to it.
The smaller the change generated by an applied force, the greater the mass of the body.
The mass of an object is a fundamental quantification of its matter content.
Weight is a measurement of an object's gravitational force. It is determined not only by the mass of the object, but also by its location. As a result, weight is a measure of force.
A balance is used to measure mass. Mass can be measured in the lab using a triple beam balance or an analytical balance.
Thus, the given statement is false.
For more details regarding mass, visit:
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Which theory was revised to obtain the theory of plate tectonics?
Continental Drift Theory
Mid-Atlantic Ridge Theory
Pangea Theory
Seafloor Spreading Theory
Answers
Answer:
Explanation:
Continental Drift Theoryin your opinion, what is the greatest environmental concern? what should be done about this?
Answers
The initial ___________ energy is equal to zero because the starting point is set at zero height to make things easier.
kinetic
potential
Answers
It would be Potential energy.
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- Hannah ❤
Answer: Potential energy
Explanation:
The initial potential energy is equal to zero. Potential energy is energy possessed by a body by virtue of its position. A body that is not moving is said to be in position and a body in position will have a zero velocity.
A rollercoaster car with a mass of 15 kg rolls down a ramp that is 10.0 meters tall.
A) Draw a sketch of the situation.
B) What is the initial potential energy of the rollercoaster car?
C) What is the initial kinetic energy of the rollercoaster car?
D) Calculate the speed of the roller coaster at the bottom of the ramp.
Answers
Refer to the diagrams shown below.
Define
KE = kinetic energy
PE = potential energy
Also,
m = 15 kg, the mass of the rollercoaster
h = 10 m, the height of the ramp.
Part B.
When the rollercoaster begins to roll down, its initial velocity is zero.
Therefore the rollercoaster has
KE = 0
PE = mgh = (15 kg)*(9.8 m/s²)*(10 m) = 1470 J
Answer: The initial PE = 1470 J
Part C.
Answer: The initial KE = 0
Part D.
Assume that frictional forces and air resistance may be ignored.
At the bottom of the ramp, the rollercoaster has
PE = 0
KE = (1/2)*m*v² = 0.5*(15 kg)*(v m/s)² = 7.5v² J
Because energy losses are ignored, the conservation of energy requires that
7.5v² = 1470
v² = 196
v = 14 m/s
Answer: 14 m/s
When sugar is added to water, the sugar dissolves and the resulting liquid is clear. Have the combined sugar and water formed a pure substance or a mixture? Explain your a answer.
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compare the relationship between kinetic energy and mass with that of kinetic energy and speed.
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The properties of a rectangular prism are listed below:
Density = 120 g/cm3
Length = 4 cm
Width = 2 cm
Height = 1 cm
What is the mass of the rectangular prism?
15 g
45 g
960 g
980 g
Answers
First calculate the volume of the rectangular prism by multiplying its length, width and height. The volume of the prism is 8 cm^3. Since density is known to be mass over volume, just multiply the given density with the volume. The mass of the prism then is 960 grams.
and Since density is the ratio of the substance's mass to its volume,Density = Mass/Volume
Mass = Density*Volume
The volume of a rectangular prism is:
V = LWH = 4×2×1 = 8 cm³
Mass = (120 g/cm³)(8 cm³)
Mass = 960 grams
Answer:
mass = 960 g
Explanation:
The rectangular prism have a density, length , width and height. We are asked to calculate the mass of the rectangular prism from the data given above.
The density of an object measures the mass of the object to it volume. Mathematically, density is the mass of an object divided by it volume. It is represented as follows;
density = mass/volume
The density of the prism is known from the data given but the volume is not given . Base on the data given, one could compute volume of the rectangular prism.
volume of a rectangular prism = Length × width × height
length = 4cm
width = 2cm
height = 1cm
volume of a rectangular prism = 4 × 2 × 1
volume of a rectangular prism = 8cm³
Since the volume is known the mass can be computed from the density formula.
density = mass/volume
mass = density × volume
density = 120 g/cm³
volume = 8cm³
mass = 120 × 8
mass = 960 g
What best describes the goals of scientific investigation and technological development?
Answers
Answer:
D. Scientific investigation aims to design and implement an experiment to learn new information, whereas technological development aims to design a product to solve a problem.
Explanation: