Answer:
Bohr's greatest contribution to modern physics was the atomic model. The Bohr model shows the atom as a small, positively charged nucleus surrounded by orbiting electrons.
Explanation:
Answer: He proposed a theory for the hydrogen atom based on quantum theory
Explanation:
An atom with 5 protons, 6 neutrons, and 5 electrons has an atomic mass of __amu. (Enter a whole number.
Numerical Answers Expected!
Answer for Blank 1:
Answer:
3
Explanation:
Which ions aren't shown in net ionic reactions, because they are present as both reactants and products of the reaction, so they do not participate in the reaction?
Explanation:
This is correct!
Ions that exist in both the reactant and product side of the equation are referred to as spectator ions. Overall, they do not partake in the reaction. If they are present on both sides of the equation, you can cancel them out.
An example is;
Na+(aq) + Cl−(aq) + Ag+(aq) + NO3−(aq) → Na+(aq) + NO3−(aq) + AgCl(s)
The ions; Na+, NO3−(aq) would be cancelled out to give;
Cl−(aq) + Ag+(aq) → AgCl(s)
Use The diagram to make some observations about how he does transferring in each of these situations
do you have some examples or options to answer ?
(4.2 x 10^8) + (2.6 x 10^6) *
Answer:
4.226×10^8
Explanation:
4.2 ×10^8+2.6×10^6=422600000
or 4.226×10^8
Which force saves the atom by emitting particles from the nucleus
Answer:
nuclear force
Explanation:
Which elements are both classified as metalloids?
Ge and As
Bi and Po
B and C
Si and P
The integumentary system functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature. Which organelle performs the same function as the integumentary system?
Cell membrane
Mitochondria
Nucleus
Cell wall
The integumentary system functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature. Cell membrane performs the same function as the integumentary system. Therefore, option A is correct.
What is cell membrane?The cell membrane performs a function that is similar to the integumentary system. The cell membrane is a thin, flexible layer that surrounds the cell and acts as a barrier between the cell and its external environment.
It helps to regulate the movement of substances in and out of the cell, maintain the balance of fluids and electrolytes, and protect the cell from harmful substances.
The cell membrane can also play a role in temperature regulation, as it helps to maintain the proper internal environment of the cell.
Thus, option A is correct.
To learn more about the cell membrane, follow the link:
https://brainly.com/question/13524386
#SPJ3
what is the difference between saturated and unsaturated hydrocarbons
Answer:
Unlike saturated hydrocarbons in which all hydrogen atoms and carbon atoms are bonded together with single bonds, unsaturated hydrocarbons have double or even triple bonds between the carbon atoms.
Describe what has to happen when matter is heated by convection
Answer:
Here^
Explanation:
The matter starts heating, up as if it's ice , turns into a liquid.
140 g of apple contains about
80 Calories (C) of energy. How many
grams of apples would you need to eat
to consume 360 Calories?
How many grams of apple would you need to eat and consume 360 calories
Answer:
630 grams
Explanation:
140/80 = 1.75
360 times 1.75 = 630
Using the periodic table, choose the more reactive nonmetal.
Br or As
Answer:
Br
Explanation:
The center atom of the CO 2 molecule corresponds to the notation
Answer:
simplest explanation regarding CO2 Molecular Geometry and hybridization. ... Carbon is the least electronegative that means it stays at the center
Explanation:
hope this helps
Please answer this question.
Mass of Helium = 4
Helium = 55 liters
How many moles = ?
_____________________________________SOLUTION:By the equation(AT S.T.P) of,
Moles = [tex]\frac{Given\ Volume}{22.4\ dm^3}[/tex]
Substitute the values,
Moles = [tex]\frac{55}{22.4}[/tex]
Simplify the fraction,
Moles = 2.5 grams/moles
_____________________________________Best Regards,'Borz'Using VSEPR theory which of the following would be the correct shape for nitrogen trifluoride?
Answer:
trigonal pyramidal
Explanation:
In NF3, the nitrogen atom is sp3 hybridized. Now we must remember that according to the VSEPR theory, the number of electron pairs in the valence shell of the central atom in a molecule determines its shape.
Here, the nitrogen atom is the central atom and its outermost shell is surrounded by four electron pairs - one lone pair and three bond pairs. This means that it has a tetrahedral electron pair geometry.
However, due to the lone pair, the three fluorine atoms are arranged in a trigonal pyramidal geometry. Hence the correct shape of the molecule is trigonal pyramidal.
Acids containing polyatomic ions are named according to the name of the anion. true or false
Answer:
true
Explanation:
Names for such acids consist of the prefix “hydro-“, the first syllable of the anion, and the suffix “-ic”. Complex acid compounds have oxygen in them. For an acid with a polyatomic ion, the suffix “-ate” from the ion is replaced with “-ic.”
How many molecules of HCl would react with 1 mole of Mg0?
Mg0 +2HCI
MgCl, + H,0
Answer:
12.044 ×10²³ molecules of HCl
Explanation:
Given data:
Number of moles of MgO = 1 mol
Number of molecules of HCl react = ?
Solution:
Chemical equation:
MgO + 2HCl → MgCl₂ + H₂O
with 1 mole of MgO 2 moles of HCl are react.
Number of molecules of HCl react:
1 mole contain 6.022×10²³ molecules
2 mol × 6.022×10²³ molecules / 1 mol
12.044 ×10²³ molecules
Naturally occurring rubidium consists of just two isotopes. One of the isotopes consists of atoms having a mass of 84.912 amu; the other of 86.901 amu. What is the percent natural abundance of the heavier isotope
Answer:
The percent natural abundance is 27.95% for the heavier isotope (86.901 amu)
Explanation:
The atomic mass of Rubidium (Rb) is 85.468.
To find the percent natural abundance, first we need to use the following equation:
84.912x + 86.901(1-x) = 85.468
x represents the percent natural abundance, in basic decimal form
In order to find x, we will use the distributive property, combine like terms and then move the constant to the other side to get x.
We are first finding the percent natural abundance of the first isotope to make this easier for us.
84.912x + 86.901(1-x) = 85.468
-> 84.912x + 86.901- 86.901x = 85.468
-> 86.901 - 1.989x = 85.458 (like terms were combined)
-> Subtract both sides by 86.901
-> Divide both sides by-1.989x
x = 0.720462544
Now turn this into a percent by multiplying by 100.
--> 72.05% for the first isotope (the one that contains 84.912 amu)
To find the natural abundance of the other isotope (the denser, heavier isotope), you could just subtract 72.05 from 100 to save time, but the usually desired way (the way that your teacher would probably want you to do) is down below:
We plug this decimal for the x-value into the parentheses from earlier:
(1 -x) ---> ( 1 - 0.720462544 ) = 0.279537456
Now we just need to convert this to a percent by multiplying by 100
0.279537456 * 100 = 27.95% of the heavier isotope (86.901 amu)
please help me ill give brainliest if right
Answer:
3000kg
Explanation:
Given parameters:
Speed = 20m/s
Kinetic energy = 600000J
Unknown:
Mass = ?
Solution:
Kinetic energy is the energy due to the motion of a body.
It is expressed as;
K.E = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the speed
Now find m;
600000 = [tex]\frac{1}{2}[/tex] x m x 20²
600000 = 200m
m = 3000kg
Atoms was determined to be 143 picometers. What is the percent error of this measured value?
Answer:
9.1% error
Explanation:
Full Question:
A measured value for the atomic radius of platinum atoms was determined to be 143 picometers. What is the percent error of this measured value?Please help me am stuck between "B" and "C"
Which of the following is the best example of a heterogeneous mixture?
A. Lemonade made of water, lemonade powder mix, and sugar.
B. An omelet made of scrambled eggs and cheddar cheese.
C. Trail mix made of raisins, peanuts, and chocolate candies.
D. A glass of ice water made of ice cubes and pure water.
Answer:
I think it's C
Explanation:
all the other ones are homogeneous because they are uniform and the same when mixed
a. lemonade is one color(yellow when mixed the same throughout)
b. omelet is scrambled together and the cheese and eggs melt together to be one
c.ice cubes and water are the same, both water
trail mix is the only different one made with different ingredients that standout
hetero- different (trail mix)
homo- same (lemonade)
whats the answer giving brainliest :))))
Answer:
D
Explanation:
Because B and C are talking about the climate. And A is just saying something general about the climate! :)
Answer:
d
Explanation:
An atom of nitrogen would be stable if it bonded with how many atoms of chlorine?
7. Which part moves the blood away from the heart?
10 bonta
O a. capillaries
b. veins
a carteries
O d. blood vessels
Answer:
Veins
Explanation:
Veins, which usually look blue, return blood to the heart.
When a neutral atom gains or loses a proton, it becomes a(n)
*
Different Element
Isotope
lon
Neutral Atom
Answer:
Ion
Explanation:
I'm pretty sure yhi
If a sample of air in a closed, rigid container was heated, would the partial pressure of oxygen increase, decrease or remain the same?
Answer:
increase
Explanation:
To solve this problem, you simply have to apply the Ideal Gas Law. Using this equation, we know that the pressure is directly proportional to the temperature. Thus, as something is heated (i.e. its temperature is increasing), its pressure would increase as well.
what would you need to do to calculate the molarity of 10g of NaCl in 2kg of water?
A. convert the 10 g of NaCl to Kg of NaCl
B. Convert the 10g of NaCl to moles of NaCl
C. Convert the 2kg of water to liters of water
D. Convert the 2kg of water to moles of water
Answer:
B) we will convert the 10 g of NaCl into moles.
Explanation:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
we will convert the 10 g of NaCl into moles.
Number of moles of NaCl:
Number of moles = mass/molar mass
Number of moles = 10 g/ 58.44 gmol
Number of moles = 0.17 mol
1 Kg = 1 L
Molarity = 0.17 mol / 2 L
Molarity = 0.085 mol/L
Molarity = 0.085 M
Answer:
B. Convert the 10g of NaCl to moles of NaCl
536 cm 53.6 greater, less or equal
Answer:
they are equal
Explanation:
=
Answer:
well i think if im remember correctly 536 is greater than 53.6 but i may be wrong please tell me if i am
Explanation:
Two samples of aluminum foil, 27 grams and 54 grams, are cut out from a roll. Which of the following properties is different for the two
Explanation:
For the two samples, the mass and volume of the foil are different but irrespective of this, the density of the aluminum foil will remain the same.
Density is an intensive property of matter. It does not depend on the amount of matter present within the substance. Density is the mass per unit volume and for every sample of a compound, it has the same amount.Mass depends on the amount of matter present and as given in the description, the sample with a high number has more mass.
Volume is the amount of space a substance occupy.
Answer:
amount of matter
Explanation:
help pls i give 20 points
How many moles are in 7.18x10^24 ions of mg
Answer:
11.93 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{7.18 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 11.92691...[/tex]
We have the final answer as
11.93 molesHope this helps you
