Answer:
True
Explanation
Any object that's still, has potential energy
Answer:
True
Explanation:
it just depends on an object's weight and its height above the ground
Describe Thomson’s and Millikan’s contributions to atomic theory.
Answer:
Thomson passed an electric current through sealed glass tubes filled with gases. Thomson concluded that electrons must be parts of the atoms of all elements. Millikan determined the charge and mass of the electron.
Explanation:
Thompson discovered electrons and proposed the plum - pudding model of the atom. Millikan measured the charge to mass ratio of an electron.
In the early days of the atomic theory, working with his cathode ray tube, J.J Thompson discovered electrons. His discovery of electrons led him to propose a model which depicted the atom as a sphere of positive charges into which negative charges were embedded. This is the plum-pudding model of the atom.
Using his famous oil-drop experiment, R.A Millikan successfully measured the charge to mass ratio of the electron and thereby determined the magnitude of charge on the electron.
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With radiocarbon dating, scientists compare an object's carbon-14 levels with _____. the carbon-14 levels of an object from the same time period carbon-14 levels in the atmosphere the carbon-14 levels in the rock surrounding the object the object's carbon-12 levels
Answer:carbon-14 levels in the atmosphere
Explanation:
When carrying out radiocarbon dating, the level of carbon-14 in a sample is compared with the level of carbon 14 in the atmosphere because, objects exchange carbon-14 with the atmosphere.
Comparison of the activities of carbon-14 in the atmosphere and in the sample gives the age of the sample since the half-life of carbon-14 is a constant.
What is the Lewis dot structure for
PF5
Answer:
40 valence electrons
four covalent bonds and one ionic bond.
Explanation:
see attached
If the compound's molecular formula is known, electron dot structures or Lewis dot formulas can be drawn. It describes the type of bond and the placement of the atoms within the molecule that are joined together. The Lewis dot structure for PF₅ is mentioned below.
Lewis dot structures, also known as electron dot structures, are schematics that show the interatomic chemical bonds in a molecule. Additionally, they show how many lone pairs there are overall in each of the atoms that make up the molecule.
Each dot in a Lewis dot structure corresponds to 1 electron. A bond is denoted by two dots placed between the atoms in chemical symbols.
The Lewis structure is:
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A ball initially at rest is dropped from a window sill 14.2 m off the ground. Find the velocity of the ball the moment it hits the ground. Round your answer to 2 decimals places.
Answer:
16.68 m/s
Explanation:
The following data were obtained from the question:
Height (h) = 14.2 m
Initial Velocity (u) = 0 m/s
Final velocity (v) =?
Thus, the velocity (v) with which the ball hit the ground can be obtained as follow:
v² = u² + 2gh
NOTE: the acceleration due to gravity (g) = 9.8 m/s²
v² = u² + 2gh
v² = 0² + 2 × 9.8 × 14.2
v² = 0 + 278.32
v² = 278.32
Take the square root of both side
v = √278.32
v = 16.68 m/s
Therefore, the velocity with which the ball hit the ground is 16.68 m/s
Protons have about the same mass as:
A. plasma particles
B. neutrons
C. electrons
CAN SOMEONE HELP ME!!!!!!!!!!!!!
Answer:
5 g/cm^3
Explanation:
Density = mass / volume
Which of these describes how traits are shown on a branching tree diagram?
A. All the traits developed at the same time.
B. The traits developed in organisms in random order.
C. Traits lower on the tree developed before traits higher on the tree.
D.Traits higher on the tree developed before traits lower on the tree.
Answer:
D- Traits higher on the tree developed before traits lower on the tree.
Explanation:
The answer is D because the higher/stronger a trait is it will be developed before any lower traits.
Explain why warm air temperature has lower air pressure than cold air?
Answer:
Differences in temperature cause differences in air density. Warmer air is less dense than cold, which is why warm air tends to rise and cold air sinks.
temparature affects particles. warm particles are more spread out.
Explanation:
. Being acted on by gravity, colder, denser air weighs more and exerts greater pressure per unit area.
1. True or False? The scientific method is defined as a method of research
in which a problem is identified, data is gathered, and a hypothesis is
created based off the data, then the hypothesis is tested.
Answer:
true
Explanation:
please mark BRAINLIEST
what is the concept of the doppler effect?
An intravenous solution contains 2.5 mEq/L of magnesium ions. How many moles of magnesium are in 750 mL of this solution?
Answer:
.9375 x 10⁻³ moles .
Explanation:
2.5 mEq / L of Magnesium ion
2.5 x 10⁻³ Eq / L
= 2.5 x 10⁻³ / 2 mole / L [ 1 mole = 2 Eq ]
= 1.25 x 10⁻³ mole / L
1 L contains 1.25 x 10⁻³ mole
750 mL = .75 x 1.25 x 10⁻³ mole
= .9375 x 10⁻³ mole .
So 750 mL contains .9375 x 10⁻³ moles .
Select the correct answer
Which statement best supports the idea that water conservation is important for human societies?
OA Once humans use water, it cannot be reused ever again,
OB. Only about 1% of the freshwater on Earth is easily accessible.
OC Water is constantly being lost from the hydrosphere
OD. Most land animals use salt water instead of freshwater.
Answer:
Only about 1% of the freshwater on Earth is easily accessible.
Explanation:
Freshwater accounts for a minimal proportion of water resources on planet earth. About 70 percent of the world surface area is covered by water, but only about 2.5 percent of this mass of water is fresh. The remaining are marine or salt water. Amazingly, just about 1 percent of this freshwater is easily accessible. The other 1.5% is trapped in glaciers and snowfields.
This underscore the need for water conservation on the planet since fresh water is a scarce resource and people living in many areas have no access to fresh water.
mL? PLEASEEE HELP
What is the answer
Someone drops a book on the floor, and it makes a loud noise. At that time, you turn to look at the person who dropped the book. The loud noise is an example of a…
A. Hydrotropism
B. Stimulus
C. Response
D. Phototropism
Answer: Stimulus
Explanation: The definition of Stimulus is "a thing or event that evokes a specific functional reaction in an organ or tissue," according to the Oxford Dictionary. So the book dropping and causing a noise is an example of a stimulus.
need help asap
Calculate the frequency for a wavelength of 635 nm.
Answer:
472114107.086614 MHz
Explanation:
f = C/λ
λ: Wavelength in meters
C: Speed of Light (299,792,458 m/s)
is this correct? say something if it's wrong lol
Answer:
seFG9zuh98gufhIUAFIyhA*UGH8gguuguuuuuuuu
Explanation:
Answer:
Yes that look about right to me :)
Which option is an example of a chemical property?
A. boiling point
B. ability to react with oxygen
C. color
D. density
Answer:
boiling point
Explanation:
Option B
PE = mgh, solve for m
Answer:
P.E. = mgh, where m is the mass in kilograms,
Answer:
[tex]m = \frac{PE}{gh} [/tex]
Explanation:
[tex]if \: PE = mgh \\ then \to \\ m = \frac{PE}{gh} [/tex]
♨Rage♨
PLEASE HELP!!
A model stands on a scale and finds her weight to be 105 pounds. If
the pressure exerted by her feet on the scale is 2.16 pounds per
square inch, what is the area of her feet in cubic centimeters?
__cm2
Answer:
313.5cm²
Explanation:
Given parameters:
Weight of model = 105pounds
Pressure applied on the scale by model = 2.16pounds per square inch
Unknown:
Area of her feet in cm² = ?
Solution:
Pressure is the force per unit area;
Pressure = [tex]\frac{Force}{Area}[/tex]
Input the parameters and solve;
2.16 = [tex]\frac{105}{Area}[/tex]
105 = 2.16 x Area
Area = [tex]\frac{105}{2.16}[/tex] = 48.6in²
We need now to convert the in² to cm²
1in² = 6.45cm²
48.6in² = 48.6 x 6.45 = 313.5cm²
What is 8S8
In need for a quick answer
Answer:
8x8 Inc. is a provider of Voice over IP products. 8x8 products include cloud-based voice, contact center, video, mobile and unified communications for businesses.
Explanation:
please need asap
An atom with 38 protons and 49 neutrons would be
Strontium-49
Francium-49
Strontium-87
Francium-87
Answer:
i think it is francium 87 if i fail then i am sorry
IUPAC name for C3H7
Answer:
propyl
Explanation:
......:)
..;) .........
Lewis diagrams of molecules of three different hydrocarbons are shown above. Which of the following claims about the molecules is best supported by the diagrams?
Answer:
D
Explanation:
Seeing the Lewis formula for each of the molecules, we can attempt to write the condensed structural formula for each.
What we notice is that while there are purely single bonds between the carbon atoms in the first molecule, there is a double bond in the second molecule and a triple bond in the third
What we can deduce from this is that these are alkanes , alkenes and alkynes
The alkynes have the strongest of the three bonds and thus they have the strongest bonds in the mix
Since molecule 3 is an alkyne, then we can say that it has the strongest of the bonds
The correct claim about the molecules that best supports the diagrams is :
( D ) The strongest carbon to carbon bond occurs in molecule 3
The first molecule ( molecule 1 ) is an alkane because the molecule is made up of only single bonds connecting the carbon atoms.
while the second mole ( molecule 2 ) is an alkene because of the presence of a double bond connecting carbon atoms.
and the third molecule ( molecule 3 ) is an alkyne because of the presence of a triple bond connecting carbon atoms.
Therefore Alkynes have the strongest of of bonds between its carbon atoms because of the presence of a triple connecting carbon atoms.
Hence we can conclude that The strongest carbon to carbon bond occurs in molecule 3
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What is the product of Na +CaSO4,
Answer:
Na + CaSO4 = Na2SO4 + Ca
Explanation:
single displacement (substitution)
Using the formula M=dx v, Calculate the mass of a liquid with a density of
17.5 g/mL and a volume of 7mL.
Answer:
The answer is 122.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 7 mL
density = 17.5 g/mL
We have
mass = 17.5 × 7
We have the final answer as
122.5 gHope this helps you
Plz help! :) :D I will mark you as BRAINLIEST!!!
Physical and Chemical Properties of Magnesium
Here is an EXAMPLE of how it has to be like. Instead of Mercury, you HAVE to do Magnesium
Physical Properties of Mercury: ”I’m a highly stable element, so you can count on me”
Chemical Properties of Mercury: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
Answer:
Some of the physical and chemical properties of magnesium are:
-The term ‘magnesium’ is derived from the Greek word magnesia, which refers to the name of the place from where it was extracted.
-Magnesium is closely related to manganese and magnetite.
-About 2.1% of the Earth’s crust contains magnesium. This makes magnesium the 6th most found element.
-The biggest deposits of magnesium is found in the seawater. It has been calculated by scientists that a cubic mile of seawater contains about 6 million tons of this element
2nd answer:
Physical Properties of Magnesium: ”I’m a highly stable element, so you can count on me”
Chemical Properties of Magnesium: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon
Explanation:
Hope this helps you out! UwU
Ionization energy is the energy needed to remove an
electron. How does the atomic radius relate to
ionization energy?
Answer: here u go:
Explanation:
The smaller the radius, the higher the ionization energy. This is because the electrons are being held in closer to the protons, which have opposing charges and therefore hold on to them, in an atom with a small radius.
What is the density of an object that has a mass of 62.4 grams and a volume of 7.6 cm 3 ?
In a longitudinal wave, particle displacement is
from google, so I think the answer to that question is the second one
A substance absorbed 895 J and caused its temperature to increase by 10 ºC. If the substance has a mass of 27.9 g, what is the substance's specific heat in J/(gºC) ?
1.) 3.21
2.) 4.62
3.) 1,406.25
4.) 249,705
Answer:
i dont get the equation sorry wish i can help