what has 9 protons and -1 charge? PLEASE HELP ME
Fluorine, I still remember this from my science fair
The molar solubility of C a ( O H ) 2 C a ( O H ) 2 was experimentally determined to be 0.019 M. Based on this value, what is the K s p K s p of C a ( O H ) 2 C a ( O H ) 2 ?
Answer:
Ksp = 2.74 x 10⁻⁵
Explanation:
The solubility equilibrium for Ca(OH)₂ is the following:
Ca(OH)₂(s) ⇄ Ca²⁺(aq) + 2 OH⁻(aq)
I 0 0
C + s + 2s
E s 2s
According to the ICE table, the expression for the solubility product constant (Kps) is:
Ksp = [Ca²⁺] x ([OH⁻])² = s x (2s)² = 4s³
Then, we calculate Ksp from the solubility value (s):
s = 0.019 M
⇒ Ksp = 4s³ = 4 x (0.019)³ = 2.74 x 10⁻⁵
The Ksp value of Ca(OH)2 is [tex]2.74 \times 10^-^5[/tex].
What is Ksp value?The Ksp is the solubility product constant.
The solubility equilibrium is
[tex]Ca(OH)_2(s) = Ca^2^+(aq) + 2 OH^-(aq)[/tex]
I 0 0
C s +2s
E s 2s
By the ICE table, the expression for Ksp is
[tex]\rm Ksp = [Ca^2^+] \times ([OH^-])^2 = s \times (2s)^2 = 4s^3[/tex]
Now, calculate the Ksp
s, solubility value is 0.019 M
then, [tex]\rm Ksp = 4s^3= 4 \times (0.019)^3 = 2.74 \times 10^-^5[/tex]
Thus, the Ksp value is [tex]2.74 \times 10^-^5[/tex]
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What contribution did Niels Bohr make to atomic theory
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:
A block of metal has dimensions of 2 cm by 5 cm by 6 cm. The block weighs 780 g. From this information, calculate the mass, volume and density.
Answer:
mass = 78 grams
volume= 2*5*6=60cm^3
density =m/v
=78/60
13/10=1.3 g/cm^3
Explanation:
The mass of the block of metal would be 780 grams
The volume of the block of metal would be 60 centimeter³
The density of the block of the metal is 13 g/cm³
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
The density is the reciprocal of the specific volume of any substance.
ρ =m /v
As given in the problem a block of metal has dimensions of 2 cm by 5 cm by 6 cm. The block weighs 780 grams
The volume of the block of metal would be = 2×5×6 centimeter³
= 60 centimeter³
The mass of the block of metal = 780 grams
ρ =m /v
ρ = 780 /60 gram/ cm³
ρ = 13 g/cm³
Thus, the mass volume and the density of the block of the metal would be 780 grams , 60 centimeter³, and 13 g/cm³ respectively.
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Explain why it is important for cells to exchange materials.
Answer:
they need the exchange so they can grow, obtain energy, and get rid of waste. It also helps to mantian a balance of amterials in the cell.
Explanation:
can u please answer this for me
Answer:
answer c
Explanation:
How many grams of sodium is equal to 6.92 x 10 21atoms of sodium?
Answer:
[tex]Amount\ of\ Grams = 0.2644 g[/tex]
Explanation:
Given
Element: Sodium
[tex]Atoms = 6.92 * 10^{21}[/tex]
Required
Determine the amount of grams
We start by solving for the number of moles
[tex]Moles = \frac{Sodium\ Atoms}{Avogadro\ Number}[/tex]
[tex]Avogadro\ Number = 6.022 * 10^{23}[/tex]
So, we have:
[tex]Moles = \frac{6.92 * 10^{21}}{6.022 * 10^{23}}[/tex]
[tex]Moles = \frac{6.92 * 10^{21-23}}{6.022}[/tex]
[tex]Moles = \frac{6.92 * 10^{-2}}{6.022}[/tex]
[tex]Moles = 1.15 * 10^{-2}[/tex] moles
Next, we calculate the amount of grams.
Mass per mol of Sodium = 22.98977g/mol
For [tex]1.15 * 10^{-2}[/tex] moles of sodium
[tex]Amount\ of\ Grams = 1.15 * 10^{-2}\ mol * 22.98977g/mol[/tex]
[tex]Amount\ of\ Grams = 1.15 * 10^{-2} * 22.98977g[/tex]
[tex]Amount\ of\ Grams = 0.264382355 g[/tex]
[tex]Amount\ of\ Grams = 0.2644 g[/tex] (approximated)
Hence, there are 0.2644g of sodium in [tex]6.92 * 10^{21}[/tex] atoms
The sun produces energy in its ____ through the process of nuclear ____ ?
Answer:
Power and Nuclear Fision
Please help! This is due in 10 minutes!
Answer:
Nitrogen-15
Explanation:
To use the correct notation, you need to use the mass number. The mass number is the number of protons plus the number of neutrons. Nitrogen has 7 protons. This isotope of nitrogen has 8 neutrons.
The correct notation is nitrogen-15.
What are the reactants in a chemical equation located? (20 Points)
A. On the right side of the arrow
B. Below the arrow
C. Above the arrow
D. On the left side of the arrow
on the left side of the arrow
The reactants in the chemical equation located on the left side of the arrow. Option D is correct.
The arrow in the chemical equation represents the direction of the chemical reaction, and it separates the reactants from the products.
A chemical equation is a symbolic representation of a chemical reaction, showing the starting materials (reactants) and the resulting substances (products). The general form of a chemical equation is as follows:
Reactants → Products
Reactants: The reactants are the substances present at the beginning of the chemical reaction. They are the starting materials that undergo a chemical change or reaction to produce new substances. Reactants were written on the left side of the arrow.
Arrow: The arrow in the chemical equation points from the reactants to the products, indicating the direction of the reaction. It symbolizes the transformation of reactants into products during the chemical reaction.
Products: The products are the substances formed as a result of the chemical reaction. They are the new compounds or elements that are produced by rearranging the atoms of the reactants. Products were written on right side of the arrow.
For example, let's consider the combustion of methane (CH₄) in oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O):
CH₄ (methane) + 2 O₂ (oxygen) → CO₂ (carbon dioxide) + 2 H₂O (water)
In this chemical equation, methane (CH₄) and oxygen (O₂) are the reactants, and they are located on the left side of the arrow. The products, carbon dioxide (CO₂), and water (H₂O), are located on the right side of the arrow.
Hence, D. is the correct option.
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The belief that you lose fat mass in a specific body part by concentrating exercise in that area is known as:
Answer:
Targeted fat loss
Explanation:
Answer:
Spot reduction
Explanation:
<3
Caleb is an inventor who has designed a new kind of fishing net. He is looking for a strong, flexible material that can be used to hold a lot of weight and will not dissolve in water. He wants a synthetic material so he does not have to depend on harvesting a natural product.
NEED CORRECT
Which material would be best for Caleb’s invention?
cellulose
nylon
polystyrene
vulcanized rubber
Answer:
Its B Nylon
Explanation:
i just took the quiz and got it right.
Answer:
nylon
Explanation:
nylon is a common material used for nets and it is strong
how many liters are in 20 grams of hydrogen gas?
[tex]\huge\bold{\mathfrak{\purple{A{\pink {n {\green {s{\blue{w{\red{e {\orange {r}}}}}}}}}}}}}[/tex]
Volume of 20 g of hydrogen at normal temperature and pressure (NTP) = 240.55 ml.
[tex]\huge\sf\underline{\underline{\red{❥︎ Thanks}}}[/tex]
The number of waves that pass a given point in a certain amount of
time is the waves...
Answer:
100
Explanation:
nsvcscjkvschssvds
What colour will red litmus paper turn if calcium hydroxide and water reacted?
do you want me to try it?
Answer:
Explanation:
blue for base.
Red for ____. What it goes red when in an acidic compound (like coke or pepsi).
So Ca(OH)2 is a base. That means it will turn blue.
The temperature of a reaction vessel with liquid reactants is lowered to one-third of the original temperature. What will happen to the rate of the reaction?
A) It will increase because fewer particles will have the required activation energy.
B) It will decrease because fewer particles will have the required activation energy.
C) It will increase because surface area of the particles will increase.
D) It will decrease because surface area of the particles will increase.
Answer:
B) It will decrease because fewer particles will have the required activation energy.
Explanation:
Temperature is one of the important factors that affect the rate of a chemical reaction. An increase in the temperature of a reaction will cause the reactants to gain more kinetic energy and hence, reduce the energy required for reactants collision (start) to occur i.e. activation energy.
Note that, once the activation energy is reduced, the rate of reaction is increased. In this case, the temperature of a reaction vessel with liquid reactants is lowered to one-third (1/3) of the original temperature. Due to a reduction in the reaction's temperature, the rate of reaction will also decrease because fewer particles will have the required activation energy.
Answer:
B. It will decrease because fewer particles will have the required activation energy.
Explanation:
I took the text :)
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?In your home, you can turn off your television set but all of your other appliances will stay on. This is because the appliances in your home are connected *
in series
in parallel
Well
Together
Answer:
in parallel
Explanation:
All of the home equipment in the residence are linked in parallel.
Are domestic appliances linked in collection or parallel?parallel association
electric appliances are connected in a parallel arrangement in a house circuit because every appliance gets complete voltage as resistance in a parallel association is low.
Why are electrical appliances in our household no longer connected in collection?electric appliances are not linked in series because the cutting-edge can be the same thru all the home equipment connected but voltage increases if extra no. Of appliances are related. If the battery has low voltage than the full voltage it can short circuit.
research greater approximately the parallel.
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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:
3. Write the equation for the reaction of metal with oxygen and non metal with oxygen and then
predict the nature of the substance formed when the oxide of metal and oxide of non metal is
dissolved in water.
Answer:
Acidic Oxides: Acidic oxide are oxides that react with water to form an acid. Acidic oxides are formed by reaction of non metals with oxygen .
[tex]S+O_2\rightarrow SO_2[/tex]
[tex]SO_2+H_2O\rightarrow H_2SO_4[/tex]
Basic Oxides: Basic oxides are oxides that react with water to form bases. Basic oxides are formed by reaction of metals with oxygen.
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
[tex]MgO+H_2O\rightarrow Mg(OH)_2[/tex]
Which of the following indicates a strong base is present?
A) pH close to 7 B) good conductor of electricity C) low reaction rate D) indicator turns green-blue
Strong bases are bases which completely dissociate in water into the cation and OH- (hydroxide ion). The hydroxides of the Group I (alkali metals) and Group II (alkaline earth) metals usually are considered to be strong bases. These are classic Arrhenius bases. Here is a list of the most common strong bases.
LiOH - lithium hydroxide
NaOH - sodium hydroxide
KOH - potassium hydroxide
RbOH - rubidium hydroxide
CsOH - cesium hydroxide
*Ca(OH)2 - calcium hydroxide
*Sr(OH)2 - strontium hydroxide
*Ba(OH)2 - barium hydroxide
A strong base has been indicated with the ability to be a good conductor of electricity. Hence, option B is correct.
What is the base?Bases are defined as compounds that have the ability to form the release of the negative ions or the hydroxide ions in the solution. The acids release hydrogen or proton, thereby bases tend to have the ability to neutralize acids.
The pH has been the measure of the solution to be able to accept or donate the protons and electrons. The pH has been measured on a scale of 1-14 with the acids having a pH of less than 7, and the pH of bases tends to move towards 14. 7 is the neutral pH.
The strong bases form the dissociation of the ions in the solution more readily, and ions contribute as the medium, thereby forming the conduction of the electricity. Hence, option B is correct.
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A. 207 kJ
B. 4730 kJ
C. 9460 kJ
D. 414 kJ
Answer:
[tex]\boxed {\boxed {\sf C. \ 9460 \ kJ}}[/tex]
Explanation:
The formula we must use is given to us:
[tex]q=mL_{vapor}[/tex]
q is the energy, m is the mass, and L(vapor) is the latent heat of vaporization.
The energy is what we calculate and the mass is 2 kilograms. We need to find the latent heat of vaporization, which is on the table.
We know the sample is copper. Find that element on the table, then the third box tells us it's latent heat of vaporization is 4730 kJ/kgNow we know:
[tex]m= 2 \ kg \\L_{vapor}=4730 \ kJ/kg[/tex]
Substitute the values into the formula.
[tex]q=(2 \ kg ) * (4730 \ kJ/kg)[/tex]
Multiply. Note that the kilograms (kg) will cancel each other out.
[tex]q= 2* 4730 \ kJ[/tex]
[tex]q= 9460 \ kJ[/tex]
9460 kilojoules are required to vaporize 2 kilograms of copper.
22
Silicon(IV) oxide is a covalently bonded compound.
Which statements are correct?
1
2
Silicon atoms form four single bonds in silicon(IV) oxide.
Oxygen atoms form two double bonds in silicon(IV) oxide.
Silicon(IV) oxide has a high melting point.
Silicon(IV) oxide contains one silicon atom and four oxygen atoms.
3
4
с
D
2 and 3 only
3 and 4 only
B
1 and 3 only
1 and 2 only
А
А
Answer:
Oxygen atoms form two double bonds in silicon(IV) oxide.
Silicon(IV) oxide has a high melting point.
Explanation:
Silicon dioxide is structurally analogous to carbon dioxide in the sense that it also contains two oxygen atoms that are double bonded to silicon the central atom in the molecule.
Silicon dioxide has a very high melting point of about 1710 degrees centigrade because of its large macromolecular structure which requires much energy to break such intermolecular interactions.
determine the energy associated with an e- in hydrogen at n=2 to n=4
Answer:
Kinetic energy of electron = -E₂ = 3.4 ev
Kinetic energy of electron = -E₄ = 0.85 ev
Explanation:
In case of hydrogen atom energy associated with nth state is,
En = -13.6/n²
For n = 2
E₂ = -13.6 / 2²
E₂ = -13.6/4
E₂ = -3.4 ev
Kinetic energy of electron = -E₂ = 3.4 ev
For n = 4
E₄ = -13.6 / 4²
E₄ = -13.6/16
E₄ = -0.85 ev
Kinetic energy of electron = -E₄ = 0.85 ev
A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.
Which of the following characteristics can be written only in space B?
a)Occurs in substances that have at least one non-metal
b) Occurs in substances that have a repeating lattice structure
c) Occurs in substances that have discrete molecular structure
d) Occurs in substances that have high melting points
It ISNT occurs in substances that have discrete molecular structure
Explanation:
I took the test and got this wrong
An element's atomic mass does not Include the mass of Its.
electrons
protons
neutrons
Answer:
The correct option would be 'electrons
Explanation:
The temperature of 15 grams of water is increased by 3.0 Celsius degrees. How much heat was absorbed by the water? (specific heat of water: 4.18 J/g deg C)
Answer:
188.1J
Explanation:
obtained from Q=MCT
A jeweler heated a sample of silver from 22.0°C to 46.0°C. The specific heat of silver is
0.235 J/gºC. If the silver absorbed 26.0 J of heat, what is the mass of the silver?
please help me!
The mass of the silver : 4.6 g
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
∆T = temperature difference :
[tex]\tt 46-22=24^oC[/tex]
The specific heat of silver is 0.235 J/gºC
Q = heat = 26 J
The mass :
[tex]\tt mass(m)=\dfrac{Q}{c.\Delta T}\\\\m=\dfrac{26}{0.235\times 24}\\\\m=4.6~g[/tex]
what are two atoms if hydrogen?
Answer:
ummm molecules i have no idea- i tried tho..
Explanation:
is known as a diatomic element hydrogen is the lightest element has an atomic number of one uses the symbol H at standard temperature and pressure hydrogen is an odorless and colorless gas it is combustible and produces water when it burns in air hydrogen is also the most abundant element in the universe with 90% of atoms in the universe being made of hydrogen main sequence Stars such as the sun burn hydrogen as fuel
What is the affect of viscosity on the shape of a volcano?
Answer:
the lava viscosity defines the size and shape of a volcano. Even though lava is 100,000 times more viscous than water, it can still flow great distances. When lava has low viscosity, it can flow very easily over long distances. This creates the classic rivers of lava, with channels, puddles and fountains.