true because I already foresighted a whole lot of things that I was not able to
Answer:
True
Explanation:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
;D
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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Which of the following species of manganese would have the largest atomic radius?
Answer:
Largest is Mg as across the period atomic radius decreases
PLEASE PLEASE HELP ME WITH THIS ASAP
Answer: 3.45
Explanation:
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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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.,,'
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.
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.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
Covalent bonds take place between..
A. A metal and a nonmetal
B. A metal and a metalloid
C. Two nonmetals
D.two metals
please answer this question. No links please!!!
Answer:
Covalent Bonds are formed when two non-metals share electrons
Hope this helps
why are noble gases considered the most stable elements
Answer:
they have the maximum number of valence electrons their outer shell can hold.
Explanation:
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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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:
caulculate the number of mass of 0.25 mol of carbon dioxide molecules
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 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.
how do i convert 9.5125 liters to gallons
Answer:
That would be 2.51293615
Explanation:
1 liter is equal to 0.264172 gallons.
What you would need to do is, multiply the total number of liters, which in this case is 9.5125, by 0.264172.
9.5125 x 0.264172 gets you 2.51293665.
I hope this helps! :)
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:
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
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!
Describe the five layers of the earth by providing the following information for each layer:
Name of the layer
Composition
Average temperature
Average thickness
make simple! pls
Answer:
answers below
Explanation:
Lithosphere/ Crust- made of large plates that move, average thickness is 30 km, average temperature is 25 degrees Celsius
Inner Core- made of solid iron, 1,200 km thick, 7,000 degrees Celsius
Outer Core- made of a dense liquid of iron and sulfur, 2,250 km thick, 4,000 degrees Celsius
Lower Mantle- made of solid rock, 2,200 km thick, 3,000 degrees Celsius
Asthenosphere/ Upper Mantle- made up of solid rock that flows due to plasticity, 720 km thick, 850 degrees Celsius
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
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.
Fill in the [?]
73,542 m = [?] km
Give your answer in standard form.
Write the equation for the alpha decay of C-11.
Write the equation for the beta decay of Be-10
HELP HELP HELP
Answer:
We know that in the decay process the sum of molecular number as well as molecular weight should be constant.
The following three reaction are as follows
1 .
Explanation:
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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An image of Earth's layer is above.
Which layer is the most dense?
layer A
layer B
layer C
layer D
Answer:
d
Explanation:
il answer in comments if you brainly me
Part A
Enter an equation for the precipitation reaction that occurs (if any) when solutions of ammonium chloride and calcium nitrate are mixed.
Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed.
ΑΣΦ
?
2NH, Cl(aq) + Ca(NO3)2 (aq) +CaCl, (s) + 2N, O(g) + 4H, O(g)
DA chemical reaction does not occur for this question
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The equation of reacting ammonium chloride with calcium nitrate will be: [tex]Ca(NO3)_2(s) + 2NH_4CI(s) --- > 2N_2O(g) + CaCl_2(s) + 4H_2O(g)[/tex]
What are chemical reactions?They are reactions involving chemical reactants.
Ammonium chloride, in solid form, will react with calcium nitrate, also in solid form to produce dinitrogen oxide gas, solid calcium chloride, and water vapor.
The equation of the reaction is represented as follows:
[tex]Ca(NO3)_2(s) + 2NH_4CI(s) --- > 2N_2O(g) + CaCl_2(s) + 4H_2O(g)[/tex]
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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
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
2NaClO3 --> 2NaCl +3O2
How many moles of NaCl were produced by 10 moles of NaClO3? Round your answer to the nearest whole number.
Answer:
10 moles of sodium chloride
Explanation:
[tex]\sf{}[/tex]
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
