Answer:
1) Convert percent (m/V) to molarity
percent (m/V)=1.15 grams/100ml=1.15 g/0.1L=11.5g/L
molarity of KBr=mol/L=g/L *(1mol/molecular weight of KBr)=(11.5g/L) * (1mol/119.0g/mol)=0.0966 mol/L=0.0966M
2) calculation of osmol from mol
In solution, KBr dissociates into two ions K+ and Br- so there are 2 osmol of KBr per mol
3) calculation of osmolarity=molarity*2=0.0966*2=0.193 Osm or Osmolar
Explanation:
brainliest would be appreciated.
from the illustration of the potassium atom fill in the periodic table selection
Answer:
2 electrons
8 electrons
8 electrons
1 electron (just count in the rings for these ones)
19 protons (it says "P=19" in the middle. The P stands for Protons)
K (it's from Latin medieval Latin "kalium")
39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)
Explanation:
Which of these is a function of all cells ?
A. To produce oxygen through photosynthesis
B. To combine with other cells to form tissues
C. To subdivide to form cells for sexual reproduction
D. To transfer genetic information from one generation to the next
Answer:
a because it help in protecting disease
Which properties cause chemical reactions?
chemical properties
chemical and physical properties
physical properties
neither chemical nor physical properties
Answer:
Chemical Properties
Explanation:
Answer: chemical properties
Explanation: chemical bonds between atoms are formed or broken.
HELP PLS WILL NAME BRANLIEST BUT No LiNkS jUsT helP No LiNkS
Answer:
I think it's A and C. Please tell me if I am wrong.
Explanation:
Answer:
Alright so I did this quiz a while ago it's A and C now could i have brainliest?
Explanation:
Which of the following species of manganese would have the largest atomic radius?
Answer:
Largest is Mg as across the period atomic radius decreases
Hi ! ❤️looking for help you can look at my past questions. giving brainliest if able to
Fill in the blanks. Liquid B is ____________________ then liquid A and liquid B would ___________________ liquid A.
1: more dense, sink under
2: less dense, sink under
3: more dense, float on top of
4: less dense, float on top of
Answer:
I think it's number one option
Which of the following ions is formed when a base is dissolved in a solution?
H+
O−
OH−
SO42+
Answer:
The Answer is B.
Explanation:
I love your name and pfp its awesome!
~Hope this helps!
When floating a ping-pong ball with a hairdryer, which two forces are balanced?
Answer:
The ping-pong ball will fly up with the air from the hair dryer until it reaches a point of balance – this is where the force of gravity (which pushes the ping-pong ball down) is equal to the force of the air (which is pushing the ping-pong ball up) hop it helps:)
What is the weakness of particle theory?
Answer:
The particle model does not take into account: the size and shape of particles. the space between particles.
The weakness of particle theory are:
matter is very small in size which are continuously moving. most of the particle are not spherical.particles are not solid because atoms are having empty space.What is particle theory?it is a part of kinetic theory which states that all matter consists of very small particles which are constantly moving or in a continual state of motion.
Therefore, lack of space between particles and size of particles are the limitations of particle theory.
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Fill in the [?]
73,542 m = [?] km
Give your answer in standard form.
Caltrain tablets contains calcium carbonate. If one tablet requires 34.46 mL of 0.291 M solution of hydrochloric acid for neutralization, how many milligrams of calcium carbonate is in this caltrate tablet?
There are 500 mg of calcium carbonate is in this caltrate tablet
The equation of the reaction is;
2HCl(aq) + CaCO3(aq) ------> CaCl2(aq) + CO2(g) + H2O(l)
Next, we have to obtain the amount HCl reacted as follows;
Number of moles = concentration × volume
Volume = 34.46 mL or 0.03446 L
Concentration = 0.291 M
Number of moles = 0.291 M × 0.03446 L
Number of moles = 0.01 moles
Since the reaction of HCl and CaCO3 are in the ratio of 2:1
2 moles of HCl reacts with 1 mole of CaCO3
0.01 moles of HCl reacts with 0.01 moles × 1 mole/2 moles
= 0.005 moles of CaCO3
Mass of CaCO3 = number of moles × molar mass
Mass of CaCO3 = 0.005 moles of CaCO3 × 100 g/mol
Mass of CaCO3 = 0.5 g or 500 mg
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Please help! How do you calculate the "average percent yield"? I just need the formula.
I already know how to find the theoretical yield and percent yield, I just don't know how to find the average or what it means by average.
Answer:
First make sure the both weights have the same units.
Take your experimental yield and divide it by the theoretical yield.
Multiply this value by 100 to find the percent yield.
Explanation:
For the Average. Add up the two percent yields that you found and divide by 2.
Look at diagram 2 above. What type of eclipse is shown based on the alignment of the Earth, Sun, and Moon?
Solar eclipse
Lunar eclipse
Answer:
solar eclipse is when the sun hits earth and lunar means moon or when the sun hits the moon for an eclipse
Explanation:
why are noble gases considered the most stable elements
Answer:
they have the maximum number of valence electrons their outer shell can hold.
Explanation:
PLEASE PLEASE HELP ME WITH THIS ASAP
Answer: 3.45
Explanation:
Which of the following is a non-reactive metal with 2 valence electrons?
O Magnesium
Chlorine
Carbon
Helium
Answer:
» a. MagnesiumExplanation:
• Magnesium is least reactive and • Magnesium has atomic number 12. Its electronic configuration is 2,8,2 . Thus, it has 2 valence electrons.A large office building is 1.07 102 m long, 31 m wide, and 4.25 x 102 m high. What is its volume?
Answer:
1409725 m^3
Explanation:
volume = length * width * height
volume = (1.07e2) * (31) * (4.25e2)
volume = 1409725 m^3
Please help me with the following question below:
Molarity as Stoikiometri
Level : SHSEquatuions od Molarity :
M = m/Mr × 1000/V
Mr Lithium Dichromate (Li2CrO4)
= Ar Li (2) + Ar Cr + Ar O (4)
= 7 (2) + 52 + 16 (4)
= 14 + 52 + 64
= 130 g/mol
Molarity
= m/Mr × 1000/V
= 19.5 g/130 g/mol × 1000/95 mL
= 0.15 mol × 10.53 /L
= 1.5795 mol/L
So, the molarity of the solution is 1.5795 mol/L
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A spoonful of table salt dissolve in a bowl of soup is what change?
Answer:
Dissolving a solid in liquid, such as table salt in water, is a physical change because only the state of the matter has changed.
Explanation:
When a spoonful of table salt (sodium chloride, NaCl) dissolves in a bowl of soup, a physical change occurs because, the chemical composition of the salt (sodium chloride) remains the same; it's just dispersed in the liquid. This change is known as dissolution or dissolving.
Here's what happens;
Physical Mixing: When you add the salt to the soup, the salt crystals mix with the liquid soup. The salt particles spread out and become evenly distributed throughout the soup.
Solute and Solvent: In this process, the salt is the solute, and the soup is the solvent. The solute is the substance being dissolved (salt), and the solvent is the substance that does the dissolving (soup).
Ion Formation: As the salt crystals dissolve, the sodium (Na+) and chloride (Cl-) ions that make up the salt separate from each other. The water molecules in the soup surround and interact with these ions, helping to pull them apart from the crystal structure.
Ionic Interaction: The charged ions from the salt interact with the polar molecules in the soup, particularly the water molecules. This interaction forms a solution, where the salt ions are evenly dispersed throughout the liquid.
Homogeneity: The resulting mixture appears uniform and homogeneous. You can't easily distinguish the salt from the soup, and the taste of the soup becomes salty due to the presence of dissolved salt ions.
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Question 1 of 5
A specific nitrogen atom has 7 protons and 6 neutrons. If this is a neutral
atom, how many electrons does the atom have?
A. 7
B. 13
C. 14
D. 6
SUBMI
Answer:
A.7
Explanation:
because proton equals to electron in neutral
caulculate the number of mass of 0.25 mol of carbon dioxide molecules
♔♔Can water stay liquid below zero degrees Celsius?✞♡♡♡
Answer:
Yes, water can stay liquid below zero degrees Celsius. There are a few ways in which this can happen. The freezing point of water drops below zero degrees Celsius as you apply pressure. When we apply pressure to a liquid, we force the molecules to get closer together.
Explanation:
Hope this helps you. Have a nice day.^_^
Please mark as brainliest. It helps a lot:)
Answer:
yes water can stay liquid below 0 ° Celsius
The flame from the candle gives off back smoke. Is this sign of a physical change or a chemical change?
Answer:
Both physical and chemical changes
What ideas do you have about why these ions are so important for life?
Answer:
i dont get it
Explanation:
im small brain and only in 5th grade
SECTIONA ANSWERALL QUESTIONS (5 MARKS PER QUESTION) 1:03 mixing a solution of silver nitrate and dilute hydrochloric acid a white precipitate is :o:med inrmediately. 1) Write an equation for the reaction (ii) The precipitate darkens rapidly upon standing. Why? :12 Explain why conductivity measurements of M* in aqueous solutions is in the order: Cs' > Rb'>K" > Na* > Li' A3 Why is it that lithium salts are often hydrated whereas those of the other alkali metals are ofien anhydrous? 44 Explain with the help of chemical equations why BeCl2 is acidic .45(a) State the main types of bonds formed by hydrogen Star lo list three ways of preparing hydrogen 16 Write an equation and identify the element formed when: (a) Polonium 210 undergoes a- decay (b) Actrium 277 undergoes ß- decay (0) Iridium 186 undergoes electron capture d) Bismuth 192 undergoes positron emission (C) Iodine 133 undergoes B- emission 47 The Uranium decay series starts with 238,2Uand ends with 206,2Pb. Each step involves the Luistentie
Answer:..,.,
Explanation:88.,,'
Earth's lithosphere floats on a hot, plastic layer which allows plate movement. What is this layer called?
crust
asthenosphere
atmosphere
core
Answer:
atmoshpere
Explanation:
il explain in comment if you brainly me
Determine the number of moles of Al2O3 that contain 6.25 x 10^23 O atoms.
Answer:
1.04 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
[tex]n = \frac{6.25 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{6.25}{6.02} \\ = 1.0382059[/tex]
We have the final answer as
1.04 molesHope this helps you
A 95,000g refrigerator is located on the 70th floor of a skyscraper (300 meters above the ground) What is the
potential energy of the refrigerator?
Answer:
285 kJ
Explanation:
potential energy
= m g h
= 95,000 g × 10 m/s² × 300 meters
= 95 kg × 10 m/s² × 300 meters
= 950 kgm/s² × 300 meters
= 285,000 J
= 285 kJ
Q13. Which of the following is a balanced chemical equation for the reaction between potassium carbonate soletion and hyelrochlori acid. 1
Answer:
Below
Explanation:
2HCl + K2CO3 -> 2KCl + CO2 + H2O
Question 5 of 5
Which idea was not supported by Dalton's atomic model but was supported in
all later atomic models?
A. A central, positive nucleus
B. Electrons in orbits
C. Positive and negative parts
D. Electron clouds
Answer:
It’s A
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions. According to Dalton, the atoms of same element are similar in all respects.
