Which compound is composed of oppositely charged ions?
Some chemical reactions releases energy other store energy what important chemical reaction storage energy?
Answer:
endothermic reaction
Explanation:
a chemeical reaction that stores energy is called endothermic reaction. More energy released as products form than the energy needed to break the reactants apart.
True or false?
Freshwater can occur as a gas, liquid, or solid.
yes they can i am in 9th rade
What is the connection of ascorbic acid when one tablet is dissolved in 200cm cubed of water ?
Answer:
Option-D: 2.3 × 10⁻³ mol/dm³
Explanation:
Calculate moles of ascorbic acid,
Moles = Mass / M.Mass
Moles = 0.080 g / 176 g/mol
Moles = 0.00045 mole
Also,
Molarity = Moles / Vol. in dm³
Molarity = 0.00045 mol / 0.20 dm³
Molarity = 0.00227 mol.dm⁻¹ or 2.3 × 10⁻³ mol/dm³
explain how air pressure keeps a balloon infalted?
Answer:
Blowing up a balloon involves forcing additional air particles from your lungs into the balloon. These particles hit the inside walls of the balloon creating enough air pressure to force the rubber of the balloon to expand and the balloon to inflate.
Explanation: hopes it helps :)
In the following reaction, what does water act as? HCl + H2O = H3O+ + Cl-
Answer:
H2O is the base dissociating for H3O+.
When the temperature of water increases the density increases as well.
True
False
Answer: False
Explanation: When the temperature of water increases the density decreases.
Write the steps you would use for ing tea. Use the words solution, solvent solute, dissolve, soluble, insoluble, filtrate an residue.
Answer:
Take a cup of water, as solvent, in a kettle and heat it.Add sugar, the solute, to water. Heat it. The sugar dissolves in water.Sugar is soluble in waterAdd some tea leaves. It is insoluble inwater. Colour of tea leaves goes into the solution.Boil the content and add milk, which is soluble in water.Filter the tea with the help of a strainer. The tea collected in the cup is a filtrate.The tea leaves collected on the strainer is residue.
-TheUnknownScientist 72
Explanation:
water, as solvent,
sugar, the solute,
sugar dissolves in water.
sugar is soluble in water
tea leaves is insoluble in water.
milk, which is soluble in water.
why do actinides form covalent bond?
Answer:
bonding driven by ionic interactions.
Explanation:
H2CO3(aq) → CO2(aq) + H2O(l) After strenuous exercise, you breathe heavily, exhaling and removing CO2 from your body. The removal of CO2 causes a shift to the __________ and the ____________ of carbonic acid in the blood to help maintain a safe blood pH range.
Answer:
did you find the answer
Explanation:
help
Answer:
D. right ; decomposition
Explanation:
What is the mass of 11 moles of water (H2O)?
Answer:
198.11 g
Explanation:
Moles = Mass / M.Mass ...... (1)
Also,
M.Mass of Water = 18.01 g/mol
Moles of Water = 11 moles
Solving eq. 1 for mass,
Mass = Moles × M.Mass
Putting values,
Mass = 11 mol × 18.01 g/mol
Mass = 198.11 g
Phosphorus-32 (32P) is an isotope that is commonly used for medical and biological research. Phosphorus-32 has a half-life of 14.28 days. A researcher orders a sample of 32P that has an activity of 5.0 mCi when it arrives. If delivery of the sample took 48 hours, what was the activity of the sample when it was shipped from the manufacturer
The activity of the sample when it was shipped from the manufacturer is 4.54 mCi
How to determine the number of half-lives that has elapsedFrom the question given above, the following data were obtained:
Time (t) = 48 hoursHalf-life (t½) = 14.28 days = 14.28 × 24 = 342.72 hours Number of half-lives (n) =?n = t / t½
n = 48 / 342.72
n = 0.14
How to determine the activity of the sample during shipping Number of half-lives (n) = 0.14Original activity (N₀) = 5.0 mCiActivity remaining (N) =?N = N₀ / 2ⁿ
N = 5 / 2^0.14
N = 4.54 mCi
Thus, the activity of the sample during shipping is 4.54 mCi
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how do I solve this organic chemistry question?
Answer:
a) 3,3-dimethyl-2-butanol
b) Attached below
c) Yes, this compound is optically active because it has one chiral carbon. Highlighted as Red below.
d) Structures attached below.
e) Isomers shown below.
Identify the missing coefficient in the balanced equation and classify the type of reaction. C2H5OH + 3O2 ⟶ _____CO2 + 3H2O 2; Combustion 2; Neutralization 3; Combustion 3; Neutralization
Answer:
It is a combustion reaction
Explanation:
I'm not sure about the number, but for sure it's a combustion reaction because the products are water and co2.
Using a dimensional analysis conversion chart, convert 2.3*10^7 milliseconds into hours.
Now
[tex]\\ \tt\hookrightarrow 2.3\times 10^7[/tex]
[tex]\\ \tt\hookrightarrow 23\times 10^6[/tex]
[tex]\\ \tt\hookrightarrow 23000\times 10^3s[/tex]
[tex]\\ \tt\hookrightarrow 23000s[/tex]
[tex]\\ \tt\hookrightarrow \dfrac{23000}{3600}h[/tex]
[tex]\\ \tt\hookrightarrow 6.3h[/tex]
Explain how storm surges can affect human life in Florida.
if you need 2.5 mole of sodium hydroxide what mass of aodium hydroxide does weight have
Explanation:
[tex]\large{ \star \fcolorbox{magenta}{purple}{ \fcolorbox{magenta}{blue}{ \fcolorbox{magenta}{pink}{ \fcolorbox{magenta}{red}{ \sf{ 2.5g }}}}}} \star[/tex]
100 cm = 1m
(Choose all that apply)
Group of answer choices
this is an incorrect equality
This is a conversion factor
this could be written as 1m / 100 cm
this could be written as 100 cm / 1m
Answer:
This is a conversion factor
Group 1 elements have an average electronegativity of 0.84 (not including hydrogen). Group 17 elements have an average electronegativity of 2.99. These two groups often form bonds. Given this information, which kind of bond will they likely form (ionic or covalent), and what evidence supports your claim? If it is ionic, then include which group gives up its electron to the other group. In three to five sentences, explain your reasoning
The elements of group 1 makes ionic bond with the elements of group 7 due to high difference of electronegativity values.
Type of bond between group 1 and 7The elements of first group lose its one outermost electrons while on the other hand, the elements of seven group needs one electron so they gain that one electron so they make an ionic bond with each other.
So we can conclude that the elements of group 1 makes ionic bond with the elements of group 7 because of the high difference of electronegativity values.
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A 0.5505 g sample of impure Ca(OH)2 is dissolved in 50.00 mL of water. 20.00 mL of the resulting solution is then titrated with 0.1939 M HCl. What is the percent purity of the Ca(OH)2 if the titration requires 22.18 mL of acid? g
Based on the data provided, the percentage purity of Ca(OH)2 is 28%.
What is the mass of Ca(OH)2 that will be diluted by 22.18 mL of 0.1939 M HCl?The equation of the reaction is given below:
Ca(OH)2 + 2 HCl ----> CaCl2 + 2H202 moles of HCl neutralizes 1 mole of Ca(OH)2Mole of HCl in 22.18 mL of 0.1939 M solution is calculated using the formula:
moles = molarity × volume in Lvolume of HCl = 0.02218 L
moles of HCl = 0.02218 × 0.1939
moles of HCl = 0.0043 moles
Moles of Ca(OH)2 neutralized = 0.0043/2 = 0.00215 moles
mass of 0.00215 moles of Ca(OH)2 is calculated using the formula:
mass = moles × molar massmolar mass of Ca(OH)2 = 74 g/mol
mass of Ca(OH)2 = 0.00215 × 74
mass of Ca(OH)2 = 0.1591
What is the percentage purity of the Ca(OH)2?Percentage purity is calculated using the formula:
Percentage purity = mass of pure Ca(OH)2/mass of impure × 100%Percentage purityof Ca(OH)2 = 0.1591/0.5505 × 100%
Percentage purity of Ca(OH)2 = 28%
Therefore, the percentage purity of Ca(OH)2 is 28%.
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In this reaction: Mg (s) + I₂ (s) → MgI₂ (s), if 10.0 g of Mg reacts with 60.0 g of I₂, and 53.88 g of MgI₂ form, what is the percent yield?
We know the law of conservation of mass
It states that mass is neither formed nor destroyed in any chemical reaction.Mass of reactants=Mass of products.Here
Mg and I_2 are reactantsMgI_2 is product with some yield.Mass of reactants=10+60.0=70.0gMass of MgI_2=53.88gMass of yield=Product-MgI_2=70-53.88=16.12gLets find the percentage
[tex]\\ \tt\hookrightarrow \dfrac{Mass\:of\:yield}{Total\:mass}\times 100[/tex]
[tex]\\ \tt\hookrightarrow \dfrac{16.12}{70}\times 100[/tex]
[tex]\\ \tt\hookrightarrow 0.23028(010)=23.028\%[/tex]
If 10.0 g of Mg reacts with 60.0 g of I₂, and 53.88 g of MgI₂ form then the percent yield is 47.09%.
What is percentage yield?
The percentage yield shows how much product is obtained compared to the maximum possible mass. When experimenting with different solutions or in the manufacturing of chemical solutions we have by-products and the actual intended products and errors in calculating them as well that makes calculated yield different from theoretical yield. Mathematically, it is given by
%yield = (calculated yield ÷ theoretical yield) × 100
Given,
10.0 g of Mg
60.0 g of I₂
53.88 g of MgI₂ forms
Mg (s) + I₂ (s) → MgI₂ (s)
24.3g Mg forms 278.11g MgI₂
1g Mg forms 11.44g MgI₂
10.0 g of Mg forms 114.4g MgI₂
%yield = (53.88 ÷ 114.4) × 100 = 47.09%
Therefore, if 10.0 g of Mg reacts with 60.0 g of I₂, and 53.88 g of MgI₂ form then the percent yield is 47.09%.
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Which of the following piece of information would allow one to determine how many atoms are in a specific molecule?
a.
mass of the electron
b.
empirical formula
c.
atomic number
d.
electrical charge
e.
molecular formula
Answer:
it a
Explanation:
You have to decide the grams you have or the grams you get once converted to moles by the atomic mass of the electron you find on the periodic table to get your amount of atoms…
For example…
65.3 grams of oxygen, you look at your periodic table to find the mass and you see it’s rounded to 16. So, you divide the 65.3 by 16, to get your atoms.
65.3/16 =4 atoms.
Molecular mass of the electron would allow one to determine how many atoms are in a specific molecule. Thus option A is correct.
What is molecular mass ?Molecular mass can be defined as the measure of mass related to a molecule means the atomic weight that is the mass of every atom present in the molecule.
Suppose water is composed of 2 hydrogen atoms and 1 oxygen atom, the molecular mass of water is equals to the atomic mass of hydrogen increased by two or more the atomic mass of oxygen.
The mass of the molecule can be controlled by many factors such as Mass Spectrometry is used to decide the mass of l molecule which is otherwise called as monoisotopic mass.
It can be controlled by Hydrodynamic Strategy which need calibration and determine the relative atomic weight.
Static Light Scattering is used to determine the molecular weight from the measure of light dispersed utilizing the Zimm technique.
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can someone please answer this question for me? i will mark brainliest and it would also be really appreciated! :)
which of the following is a sign a chemical reaction has occurred?
A- A blue liquid is mixed into a yellow liquid, and the mixture turns green.
B- A piece of metal is placed in Water and produces sparks and gas.
C- A liquid is heated on a hot plate, And bubbles form.
D- A solid powder is mixed into a liquid and disappears.
Answer:
The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
B- A piece of metal is placed in Water and produces sparks and gas.
how do you calculate metal density?
Answer:
You can divide the mass by the volume to calculate the density of the metal
Explanation:
What do all acids have in common?
Answer:Both acids and bases produce a part of a water molecule. Bases dissociate hydroxide (–OH) ions and acids, hydrogen (H+) ions
The VSEPR theory is an abbreviation for which term?
A Valence shell electron positive repulsion
B Valence shell electron proton relation
C Valence shell electron pair repulsion
D Valence shell electron positive relation
this is what you can pick through organs, structure or tissue : A group of cells connected together. They have similar make-up and work to do.
the answer is a group of tissue.
Which of the following are forms of ENERGY? Click all that apply!
O LIGHT
O SOUND
O ELECTRICITY
The final answers for the following problems should be written
6. Convert 2.225 x 1010 grams into kilograms.
Answer:
2.24725 kilograms
Explanation:
To convert grams to kilograms, you divide the number of grams you have by 1000. So, 800 g = 2.225 x 1010/1000 = 2.24725 kg
2C2H2(g) + 502(g) → 4C02(g) + 2H20(g) reaction type?
Answer:
The answer is combustion.
