Answer:The alpha particles that were fired at the gold foil were positively charged. ... These experiments led Rutherford to describe the atom as containing mostly empty space, with a very small, dense, positively charged nucleus at the center, which contained most of the mass of the atom, with the electrons orbiting the nucleus.
Explanation:Thomson's cathode ray experiment and Rutherford's gold foil experiment. ... that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. ... mass of each particle was much, much smaller than that of any known atom. ... Why did Thomson conclude that electrons could be found in atoms of all elements?
HELP DUE IN 5MIN WILL MARK BRAILIEST
pLS ANSWER THIS QUESTION THE QUESTION IN THE SCREEN SHOT HAVING TO DO WITH ICE AND WATER
Explanation:
The problem deals with a phase transition from solid to liquid. To the left we have ice and to the right we have liquid water.
For such change to take place, the process of melting must occur. During melting, a solid changes state from solid to liquid by taking energy from the environment.
In solid state, the molecules of the water are in a fixed state about their fixed lattice. As the solid ice gains energy from the environment, it begins to melt. Energy increase causes the molecules of the water to start flowing to form a liquid.10. How many moles of Ne are in a 0.50L tube at 200kPa and 50 °C? 11,60
Answer:
0.04 mol Ne
General Formulas and Concepts:
Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Gas Laws
Combined Gas Law: PV = nRT
P is pressure (in kPa)V is volume (in liters)n is amount of molesR is gas constant - [tex]\displaystyle 8.314 \frac{kPa \cdot L}{mol \cdot K}[/tex]T is temperature (in Kelvins)Explanation:
Step 1: Define
P = 200 kPa
V = 0.50 L
T = 50°C
Step 2: Identify Conversions
Temperature Conversion: K = °C + 273.15
Step 3: Convert
Substitute T [TC]: K = 50°C = 273.15Add: K = 323.15Step 4: Find Moles
Substitute [CBL]: [tex]\displaystyle (200 \ kPa)(0.50 \ L) = n(8.314 \frac{kPa \cdot L}{mol \cdot K} )(323.15 \ K)[/tex]Multiply: [tex]\displaystyle 100 \ kPa \cdot L = n(2686.67 \frac{kPa \cdot L}{mol})[/tex]Isolate n: [tex]\displaystyle 0.037221 \ mol = n_{Ne}[/tex]Rewrite: [tex]\displaystyle n_{Ne} = 0.037221 \ mol[/tex]Step 5: Check
Follow sig fig rules and round. We are given 1 sig figs as our lowest.
0.037221 mol Ne ≈ 0.04 mol Ne
Which of these discoveries contradict components of Dalton’s atomic theory? Check all of the boxes that apply.
Atoms contain smaller particles: protons, neutrons, and electrons.
Atoms of a given element can bond to other atoms only in specific ways.
Atoms of a given element can have different numbers of neutrons.
Nuclear reactions can change an atom of one element into an atom of another element.
All atoms of a given element have the same number of protons.
Answer:
A, B, D
Explanation:
Ed22
An organism making an identical copy of itself is what type of reproduction?
Answer:
This is an example of Asexual Reproduction
An organism making an identical copy of itself is Asexual Reproduction. One of most crucial biological ideas is reproduction.
What is reproduction?One of most crucial biological ideas is reproduction, which refers to creating a duplicate or a likeness in order to ensure the survival of a species. The capacity of any simple chemical system to replicate itself must have been one of the first traits of life that appeared in the distant past.
Although the creation of offspring in plants and animals is the only purpose of reproduction, the more broad definition of reproduction is of considerably greater importance to living things. The beginning of life as well as the evolution of creatures must be taken into account to fully understand this truth. An organism making an identical copy of itself is Asexual Reproduction.
Therefore, an organism making an identical copy of itself is asexual Reproduction.
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1) If you transfer energy into two solid substances, which do you think would melt first: a substance with stronger molecular attraction or a substance with weaker molecular attraction?
2) If you transfer energy out of two substances in the gas phase, which do you think would condense first: a substance with stronger molecular attraction or a substance with weaker molecular attraction?
PLEASE HELP
Answer:
1) A substance with a weaker molecular attraction would melt first.
2) A substance with stronger molecular attraction would condense first.
The first substance to melt is one with a lesser molecular attraction. The first substance to condense would be one with greater molecular attraction.
What is molecular attraction?Molecular attraction is defined as the distance between molecules at which their mutual forces become noticeably significant. The distance between two molecules at which the forces acting between them are of observable magnitude is known as the range of molecular attraction. The forces weaken as the molecular distance increases, eventually becoming insignificant.
In comparison to solids, liquids have a greater intermolecular distance. In other words, when something melts, the molecules spread apart more. As a result, intermolecular forces of attraction become weaker. First, a condensed molecular substance must be appealing. Gas molecules become more attracted to one another due to the increasing demand, which also increases the CE between molecules.
Thus, the first substance to melt is one with a lesser molecular attraction. The first substance to condense would be one with greater molecular attraction.
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Which of the following is included in the study of Geology?
a : the composition of the sun
b : the composition of air
c : the composition of water
d : the composition of the materials that make up the planet
HELP ME PLEASE!!!....
Answer:
That's Law of Motion because the second law is based on acceleration of an object and its mssd but the boat isn't accelerating.
The third law is based on if the object has an equal and opposite force but there's no opposite force compelling the action
Help me ! Which goes with which
Answer:
1. Cerium
2. Iodine
3. Potassium
4. Lead
5. Boron
6. Calcium
7. Krypton
8. Einsteinium
Explanation:
Hope it helped!
I needa know the first one help✋
Answer: Soil permeability is the property of the soil to transmit water and air and is one of the most important qualities to consider for fish culture. A pond built in impermeable soil will lose little water through seepage. The more permeable the soil, the greater the seepage.
Explanation:
How does the Troposphere (atmosphere where weather takes place) affect the hydrosphere?
i need help with math
Answer: Atmosphere - Atmosphere - Troposphere: The lowest portion of the atmosphere is the troposphere, a layer where temperature generally decreases with height. This layer contains most of Earth’s clouds and is the location where weather primarily occurs. The lower levels of the troposphere are usually strongly influenced by Earth’s surface.
Explanation:
what is the formula for trinitrogen pentafluoride?
Answer:
S2I3
I can't type it on the key board but it's S and 2 is small down side
I and the 3 is down side too
1. What are the characteristics of a solid? it has blank shape and a definite blank
Solids are defined by the following characteristics:
definite shape (rigid)
definite volume.
particles vibrate around fixed axes.
My teacher gives me a block of some unknown material. I weigh it and find out that it weighs 22.5g. I then heat it up using 2067J of energy and notice that it only changes by 25 degrees celsius. What is its specific heat?
The specific heat of unknown material : 3.675 J/g °C
Further explanationGiven
mass of block = 22.5 g
Q = heat = 2067 J
Δt=25 °C
Required
The specific heat
Solution
Heat can be formulated :
Q = m.c.Δt
Input the value :
2067 J = 22.5 g x c x 25 °C
c = 3.675 J/g °C
You have 50 L of CO2 gas at standard temperature and pressure (STP). What would need to be done to the pressure to cut the volume of gas in half?
The pressure is doubled(2 atm)
Further explanationGiven
50 L of CO₂ gas at STP
Required
The pressure
Solution
Changing pressure, constant temperature⇒Boyle's Law
At a fixed temperature, the gas volume is inversely proportional to the pressure applied
[tex]\tt \rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
STP⇒1 atm, T=273 K
The (new) volume of gas in half, so V₂=0.5 V₁ = 0.5 x 50 = 25 L
Because the gas volume is inversely proportional to the pressure than the pressure doubled = 2 atm
Or we can use the formula :
P₂=(P₁V₁)/V₂
P₂=(1 atm x 50 L)/25 L
P₂= 2 atm
Look at the activity series and select which two of the following reactions
would happen on their own. (Remember, if the lone element is more active
than the metal in the compound, the lone element will react and replace the
metal in the compound.)
The Activity Series
Most Active
Lithium (Li)
Potassium (K)
Calcium (Ca)
Sodium (Na)
Aluminum (AI)
Zinc (Zn)
Iron (Fe)
Tin (Sn)
Lead (Pb)
(Hydrogen) (H)
Copper (Cu)
Silver (Ag)
Gold (Au)
Least Active
O A. 2Li + ZnBr2 + 2LiBr + Zn
B. 3Ca+ Al2O3 + 2Al + 3Cao
C. Al +3LICI - AlCl3 + 3Li
D. Sn + ZnSe → SnSe + Zn
Answer:
b
Explanation:
because the correct answer
How many moles are in 0.532g Ca(OH)2?
Answer:
0.0072mole
Explanation:
Given parameters:
Mass of the compound given = 0.532g
Unknown:
Number of moles = ?
Solution:
To solve this problem, we need to use the expression below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Ca(OH)₂ = 40 + 2(16 + 1) = 74g/mol
Number of moles = [tex]\frac{0.532}{74}[/tex] = 0.0072mole
8. When rubidium and fluorine combine to produce the compound RbF, che ions
formed have the same electron configuration as atoms of
a neon, only
b both argon and neon
c both krypton and neon
d both xenon and neon
Answer:
The answer is C, both krypton and neon.
Explanation:
I got the answer wrong and my teacher told me that c is the right answer choice
Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore, the correct option is option C.
What is Ions?Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.
Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
Rb react as cation Rb ⁺ with electron distribution as [Kr] after removal of 1 electron from s orbital. F react as anion F⁻ with electron distribution [He] 2s² 2p⁶ which is equal to electronic configuration of neon.
Therefore, the correct option is option C.
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Who can help me with this? I will give brainliest lmk!
IN THIS ORDER: nucleon, neutrons, element, different, isotopes, industrial
hope this helps!
Would anyone kindly tell me the answers or how to do this ♀️
Answer:
Its is not sodium- the answer to number 2 is CS+1 O-1 = CSO im not 100% sure but its something like that :)
Explanation:
Flerovium valence electron dots . Did I put the dots in the right place ? Did I do it right ? ANSWER FAST ! 10 points !
Answer:
Flerovium has 4 valence electrons in its outer shell. So, you did it right. All the dots are in the right place. Just fill in the dots and you should be good.
Hope that helps.
The reason that Noble Gases do not react is because
Answer:
Noble gases are odorless, colorless, nonflammable, and monotonic gases that have low chemical reactivity. The full valence electron shells of these atoms make noble gases extremely stable and unlikely to form chemical bonds because they have little tendency to gain or lose electrons.
Answer:
noble gas
Explanation:
noble gas don't react because they already fulfill the octet rule. and have 8 valence electron
A chemical equation is balanced by what
-Adding coefficients
-Changing the subscripts -erasing elements as necessary
-Adding elements as necessary
Answer:
adding coefficient
Explanation:
To balance a chemical equation we have to place coefficients as needed in front of the symbols or formulas so the same number of each type of atom occurs in both reactants and products
FOOD MACROMOLECULES INTRODUCTION
Biological Macromolecules
Most common elements in living things are carbon, hydrogen, nitrogen, and oxygen. These four elements constitute about 95% of your body weight. All compounds can be classified in two broad categories ---organic and inorganic compounds. Organic compounds are all based on carbon. Carbon can form single bonds with another atom and also bond to other carbon molecules forming double and triple bonds. This allows carbon based molecules to form single and double rings, chains, and branching chains. Most organic compounds are built primarily of carbon, hydrogen, and oxygen but in different ratios. Each small organic molecule can be a unit of a large organic molecule called a macromolecule. If the small organic units are identical or form patterns they are called monomers and the large organic molecule they form is called a polymer.
When monomers are joined together the reaction is called dehydration synthesis or condensation as water is produced when the monomers are bonded together. To break the polymers down again the reaction is called hydrolysis. Notice how water is used or produced in these two reactions shown to the right.
There are four classes of macromolecules: carbohydrates, lipids, proteins, and nucleic acids. Heterotrophs, like us, must get these biological macromolecules from our food which we break down into monomers through digestion. This makes the molecules small enough to cross cell membranes. Our cells use them either as energy sources or to build the carbohydrates, proteins, lipids, and nucleic acids that our body needs
Questions:
.
What atom makes up the backbone of biological macromolecules?
Answer:
this is nice..... cool
Explanation:
Determine the number of valence electrons for following (Ne) 3s2 3p4
a.3
b.2
c.4
d.7
e.16
f.6
Pls help
Answer:
F. 6
Explanation:
urgent plzz help meeee thx
The balanced equation :
C₃H₈(g)+5O₂(g)→3CO₂(g)+4H₂O(g)
Further explanationGiven
The reaction of Propane(combustion)
Required
Balanced equation
Solution
Reaction
C₃H₈(g)+O₂(g)→CO₂(g)+H₂O(g)
Give a coefficient(the most complex compound = 1) :
C₃H₈(g)+aO₂(g)→bCO₂(g)+cH₂O(g)
Make an equation :
C, left = 3, right=b⇒b=3
H, left = 8, right=2c⇒2c=8⇒c=4
O, left = 2a, right=2b+c⇒2a=2b+c⇒2a=2.3+4⇒2a=10⇒a=5
The equation becomes :
C₃H₈(g)+5O₂(g)→3CO₂(g)+4H₂O(g)
HELP!! 75 pts
A 12.00 gram sample of a crude ore contains 2.89 % HgS. What is the percentage of mercury in the ore? (2.49)
The percentage of mercury in the ore : 2.49%
Further explanationGiven
12 g of sample
2.89% HgS
Required
The percentage
Solution
mass of HgS in the ore :
= 2.89% x 12 g
= 0.3468 g HgS
Mass of Hg in HgS :
= (Ar Hg/MW HgS) x mass HgS
= (200.592/232,66 g/mol) x 0.3468
= 0.299 g
% mercury (Hg) in sample(a crude ore) :
= (0.299 g : 12 g) x 100%
= 2.49%
Which of the following is the correct formula for Ca2+ reacting with NO2??
O A. Ca NO2
O B. Ca(NO2)2
O C. Ca (NO)
O D. CaNO2
Answer:
B. Ca(NO2)2
Explanation:
Ions (charged atoms) combine with one another to form stable ionic compounds. In this case, calicium ion (Ca2+) is said to react with NO2, which has a charge of -1 i.e. +1-1(2) = 1-2 = -1.
This means that calcium has a charge of +2 while nitrite ion has charge of -1, hence, when they combine, they exchange their charges, which become their subscript as follows:
Ca2+ + NO2- → Ca(NO2)2
Ca(NO2)2 is a stable ionic compound called calcium nitrite. Notice that it takes two atoms of NO2- to react with one atom of Ca2+.
The percent composition of nh42c2o4
Answer: Percent composition by element
Element Symbol Mass Percent
Hydrogen H 6.498%
Carbon C 19.357%
Nitrogen N 22.574%
Oxygen O 51.571%
HOPE THIS HELPS
An atom of sodium can transfer its one valence electron to an atom of...
O magnesium to complete the octet rule
O fluorine to complete the octet rule
O nitrogen to complete the octet rule
O calcium to complete the octet rule
Answer:
I believe it is B,fluorine to complete the octet rule
Explanation:
Answer:
fluorine to complete the octet rule
Explanation:
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