Answer:
proton
Explanation:
"Proton: A positively charged particle found in the nucleus of an atom. A proton contributes one atomic mass unit to the total atomic weight of an atom" this is definition per Google search
all smart people i need help
Answer:
its b
Explanation:
Answer: the first box
Explanation:
People were surveyed to find out which part of the smore they like best. The data is as follows: 75% chocolate, 20% marshmallow, 5%. This information would be best displayed by aImmersive Reader
a. line graph
b. scatter plot
c. pie/circle graph
d. bar graph
Answer:
Pie/Circle graph
Explanation:
Pie/Circle Graphs are best for demonstrating parts of a whole, especially with percents.
Which of the following are signs of a chemical change/reaction? Select all that apply.
1. A change in mass.
2. A change in energy (hot, cold, light)
3. A change in volume.
4. A change in odor.
5. A change in color.
6.A change in phase/state.
7. Boiling.
8.Melting.
9. Freezing.
Answer:
the answers are
Explanation:
5,6,7,8&9.
What did John Dalton contribute to the understanding of the atom?
John Dalton contribute to the understanding of the atom that all matter was composed of atoms, indivisible and indestructible building blocks.
While all atoms of an element were identical, different elements had atoms of differing sizes and mass.
What is an atom?An atom is a particle of matter that uniquely defines a chemical element.
An atom consists of a central nucleus that is usually surrounded by one or more electrons.
Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties.
Dalton based his theory on the law of conservation of mass and the law of constant composition.
The theory states that all matter is made of atoms, which are indivisible.
(1) All matter is composed of tiny, indivisible particles, called atoms, that cannot be destroyed or created.
(2) Each element has atoms that are identical to each other in all of their properties.
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How many Protons, electrons, and neutrons are in Dysprosium?
EASY POINTS?
Answer:
Number of Protons - 66
Number of Neutrons - 97
Number of Electrons - 66
Explanation:
You're welcome :3
What happened to the rate of the reaction when the concentration was increased?
Explain the effect of concentration on reaction rate in terms of collision theory. Your answer should include at least four complete sentences.
Answer:
If you increase the concentration of a reactant, there will be more of the chemical present. More reactant particles moving together allow more collisions to happen and so the reaction rate is increased. The higher the concentration of reactants, the faster the rate of a reaction will be.
When scientists obtain new information, what happens to an existing scientific theory?
It is revised
It is reevaluated
It becomes a law
It remains the same
Answer:
It is reevaluated
Explanation:
Because of this new evidence, the theory can change, so the scientists must reevaluate the theory
The half life of iodine-125 is 60 days. What was the initial amount of iodine-125 if you have 4.5 grams after 360 days?
Answer:
288 grams
Explanation:
The amount of any radiative substance left after some time is calculated by
amount left = [tex]x/2^n[/tex]
where x is the initial amount of substance
n is the number of half lives
one half live is the time in which amount of substance reduce to half of its initial value.
------------------------------------------------------
amount left = 4.5 grams
half life of iodine-125 = 60 days
total time in which substance reduced to 4.5 grams = 360 days
thus,
number of half life in 60 days = 360/60 = 6
thus, there are period of 6 half lives
in each half life the amount of substance reduces to its previous half
let the initial amount be x grams
using the formula
amount left = [tex]x/2^n[/tex]
[tex]4.5 = x/2^6 \\ 4.5 = x/64\\x = 4.5*64 = 288[/tex]
Thus, 288 grams was the initial amount of iodine-125
Katie needs to measure water for a recipe she is using to cook dinner she should measure the liquid in...
A. inches
B. pints
C. pounds
D. yards
Answer:
pints
Explanation:
Answer:
B: pints
fl.oz.
Explanation:
Periodic Trends
PLEASE HELP ME! I WILL GIVE BRAINLIEST
The density of water is ____________.
Answer:
The density of water is 1 g/mL.
Explanation:
Which question can be answered by science?
Group of answer choices
Why should we help those less fortunate than us?
Which type of candy tastes the best?
Which kind of backpack do students purchase most often?
Why are children happy when they get home from school?
Answer:
C.
Explanation:
How is a controlled experiment performed?
What strategies are involved in solving a science problem?
Answer:
In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. State what steps you will take to design an experiment to test your hypothesis. Complete the experiment. Make observations. Record what happened during your experiment.
Energy and wavelength have a (n)___
relationship
I need help with this ASAP PLEASE!! WILL MARK BRAINLIEST!!
Write the following value in decimal form
8.99 x 10^-7
Answer:
0.000000899
Explanation:
8.99x10^-7
move the decimal to the left 7 times.
0.000000899
Answer:
0.000000899
Explanation:
.,.......,.........
Which group of elements should all have similar chemical behavior?
magnesium, strontium, and sodium
b) sulfur, phosphorus, and silicon
c) hydrogen, oxygen, and nitrogen
d) argon, helium, and neon
Answer:
the correct answer is D
these are the last 2 questions on my assignment.... please help
1..orbit
2..7
I hope this was helpful
which contains the most amount of energy a glass of water at 20C or a glass of water at 80C. EXPLAIN ANSWER
Answer:
80C
Explanation:
As a substance gets hotter, or as a substance gets closer to the state of gas, the particles in the substance move faster, become more spread out and have more energy. This is why Gas has the most energy while solids have the least. Therefore, the hotter a substance is the more energy it has.
A glass of water at 80°C will have the most amount of energy
Explanation:
The temperature is defined as the degree of hotness and coldness of the object.It is a measure of the average kinetic energy of the particles of the object.The hotter the object, the higher will be the kinetic energy of the particles of the object, higher will be the value of temperature.The colder the object, the lower will be the kinetic energy of the particles of the object, lower will be the value of temperature.So, from this, we can conclude that glass with water at a higher temperature that is 80°C will have a higher amount of energy than a glass of water at 20°C.
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Maria’s class has learned how to drop an egg without breaking it. After 0.2 s, the kinetic energy of the falling egg is 0.5 J. If its mechanical energy is 2.3 J, what is its potential energy?
A. 1.2 J
B. 1.8 J
C. 2.8 J
D. 4.6 J
The Potential energy of the body is 11.8 Joules
The mechanical energy of the egg is given by the formula:
Mechanical energy = Potential energy + kinetic energy
Given the following parameters;
Mechanical energy = 2.3 JoulesKinetic energy = 0.5 JoulesFrom the formula:
Potential energy = ME = KE
Potential energy = 2.3 - 05
Potential energy = 1.8 Joues
Hence the potential energy of the body is 11.8 Joules
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The statement "If I put fenders on a bicycle,
then they will keep the rider dry when riding
through puddles" is an example of
A. an observation.
B. a hypothesis.
C. a theory.
if 11 molecules of monosaccharides with the formula C6H12O6 are assembled to produce a complex carbohydrate, how many atoms of hydrogen be in the final polymer?
Infrared radiation A) Heat from warm objects, used to detect the location of objects Microwaves B) All the radiation humans can see, ranging from red to violet Ultraviolet light C) Used in radar and to heat food Visible light D) Given off by very hot objects, such as the sun
Answer:
Infrared radiation → A) used to detect the location of objects
Microwaves → D) Used in radar and to heat food
Ultraviolet light → C)Given off by very hot objects, such as the sun Heat from warm objects
Visible light → B) All the radiation humans can see, ranging from red to violet
Explanation:
Microwaves have magnetic waves with very long lengths, greater than that of infrared light. These waves are produced through vibrations that produce heat, as the microwave is turned on, which allows the food to be heated. These waves are also used to provide communication on some types of devices.
Infrared radiation is a type of non-ionizing radiation that has a low frequency and therefore cannot be visualized, since it is not within a visible electromagnetic spectrum, having a frequency lower than red. It can be used to detect the licalization of objects and does not pose a health risk.
Ultraviolet radiation is extremely harmful to our body. It is characterized by radiation with very small wavelengths, less than 400nm. This type of radiation can be released by the sun and ultraviolet lamps.
Visible light refers to the simplest form of electromagnetic wave and covers all the radiation that our eyes can see, allowing different colors to be seen in the objects we observe according to the reorganization of atoms and molecules.
Answer:
A=Microwaves
B=Ultraviolet light
C=Visible light
D=Infared radiation
Explanation:
A) Used in radar and to heat food
B) Given off by very hot objects, such as the sun
C) All the radiation humans can see, ranging from red to violet
D) Heat from warm objects, used to detect the location of objects
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5.) You bought a new car and estimated that your monthly payment would be $312. However, your actual
payment amount is $325. How much error was in your estimate?
what role do particles play in exterting pressure?
Answer:
Pressure is an important physical quantity—it plays an essential role in topics ranging from thermodynamics to solid and fluid mechanics. As a scalar physical quantity (having magnitude but no direction), pressure is defined as the force per unit area applied perpendicular to the surface to which it is applied. Pressure can be expressed in a number of units depending on the context of use.
Explanation:
Probably not the best answer but hope this helps somewhat. :)
If this decay has a half life of 2.60 years, what mass of 72.5 g of sodium 22 will remain after 15.6 years
Sodium-22 remain : 1.13 g
Further explanationThe atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.
Usually, radioactive elements have an unstable atomic nucleus.
General formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{T/t\frac{1}{2} }}}[/tex]
T = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
half-life = t 1/2=2.6 years
T=15.6 years
No=72.5 g
[tex]\tt Nt=72.5.\dfrac{1}{2}^{15.6/2.6}\\\\Nt=72.5.\dfrac{1}{2}^6\\\\Nt=1.13~g[/tex]
Why do elements form chemical bonds?
Answer:
to make them more stable by filling up electrons
How do you convert 34.6 kilograms to micrograms?
Also the Steps that got you that answer
What are chemical sedimentary rocks formed from?
Answer:
Elements in fluids.
Explanation: They're formed from elements crystalizing in fluids (Like water.) For example limestone forms on the bottom of the ocean from calcium.
Answer:
The precipitation of ions in solution
Explanation:
9. Use dot and cross diagrams to represent the following compounds.
a. Sodium chloride (NaCl)
Answer:
I have attached the diagram
Which of the following is a measure of the amount of matter than object contained.
Weight
Mass
Volume
density
Answer:
weight = newton
mass = kilogram
volume = cubic meter
density = kilogram per cubic meter
Answer:
weight hghhiixjdhdhbdnfnfjfjjcndndnfmckkxkx