Answer:
it would occur when there are two different metals involved.
the number of nucleons of an isotope represents the total number of..
Answer:
The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The mass number is different for each different isotope of a chemical element.
The half-life of a certain element is 100 days. How many half-lives will it be before only one-fourth of this element
remains?
4
50
25
2
Based on your research, which source of energy do you think best meets the needs of society? Defend your answer in 50 to 100 words.
Currently, fossil fuels meet the 80% of needs of the society. But it is a non-renewable source, and it will extinct soon. The leading renewable source is wind power.
What is the non-renewable and renewable source?Non-renewable energy are the energies that will require a thousand of years to make and ones extinct, will not be prepared.
Renewable energy sources can be prepared again and again, examples are wind, solar, hydropower.
Thus, the fossil fuel and wind power is the leading source of energy that meets the needs of society.
Learn more about the renewable source
https://brainly.com/question/13258110
#SPJ1
Calculate molecular mass of Ca(OH)2
Answer:
The molar mass of calcium hydroxide,
Ca(OH)2, is 74.092 g/mol.
Explanation:
The molar mass of a compound is determined by multiplying the subscript of each element in the formula by its molar mass (atomic weight on the periodic table) in g/mol, and adding the results.
The formula for calcium hydroxide is: Ca(OH)2
Molar Mass Ca(OH)2:
(1×40.078g/mol Ca)+(2×15.999g/mol O)+(2×1.008g/mol H)
=74.092 g/mol Ca(OH)2
Answer:
74.093 g/mol
Explanation:
Add the mass of Ca (found on the periodic table), the mass of 2 oxygens and 2 hydrogens together.
40.078+2(15.999)+2(1.00784)=74.093
what is 1+1? answer in full sentences.
Convert 4.92 L of hydrogen at STP to moles.
a 0.202 mol H2
b 0.444 mol H2
C 0.220 mol H2
d 4.55 mol H2
Answer:
c. 0.220 mol H₂
Explanation:
No. of moles
Volume present / Volume at STP4.92 L / 22.4 L0.220 mol H₂[tex]{\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}[/tex]
[tex] \sf C) \: 0.220 \: mol \: H_2[/tex]
Explanation:
1 mol = 22.4 litres
4.92 = how many moles?
[tex] \sf \implies \frac{4.92}{22.4} \\ \\ \sf \implies 0.2196 \\ \\ \sf \implies 0.220 \: mol \: H_2[/tex]
a)6.144
b)0.644
c)-0.644
Answer:
b
Explanation:
is the dictionary definition of a word.
is the feeling or idea associated with a word.
4. Who has the most sensitive taste buds?
adults
babies
teenagers
the elderly
Answer:
Taste bufs
Explanation:
May be teenager or adult is the most probable answer because teenager and adult are fully developed species of human so they can have most sensitive taste bud
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT
The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would explain a lower rate after another 3 seconds?
The concentration of reactants increased while the concentration of product decreased.
The concentration of reactants decreased while the concentration of product increased.
All concentrations of reactants and products decreased.
All concentrations of reactants and products increased.
Lower rate after another 3 seconds of the given rate is concentration of reactants increased while the concentration of product decreased.
What is the rate of reaction?Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of product.
Given rate of reaction = 1.8×10⁻⁶ m/sec
After 3 seconds rate of the reaction decreases, which means speed of the formation of product decreases as a result of which:
Concentration of product decreases.Concentration of reactant increases.Hence, concentration of reactants increased while the concentration of product decreased.
To know more about rate of reaction, visit the below link:
https://brainly.com/question/24795637
#SPJ1
Answer:
B. The concentration of reactants decreased while the concentration of product increased.
Explanation:
i took the test
what is the chemical formulae for lime water
Answer:
The formula for lime water is Ca(OH)2 and the chemical name for lime water is calcium hydroxide.Explanation:
#Let's Study
#I Hope It's Help
#Keep On Learning
#Carry On Learning
[tex]\\ \purple{MaggieEve}[/tex]
At 0.500 atm and 15.0°C a sample of gas occupies 120. L. What volume does it occupy at
0.250 atm and 10.0°C?
O236 L
O 60 L
O 111 L
O 480 L
The combined gas law is used to determine the relationship between the pressure, temperature, and volume of the gas. The volume of the gas at 0.250 atm is 236 L. Thus, option A is correct.
What is combined gas law?The combined gas law uses the ideal gas equation to estimate the temperature, volume, or pressure of the given gas.
Given,
Initial pressure = 0.500 atm
Initial temperature = 288.15 K
Initial volume = 120 L
Final pressure = 0.250 atm
Final temperature = 283.15 K
The final volume is calculated as:
V₂ = (P₁V₁ T₂) ÷ (P₂ T₁)
= 0.500 × 120 × 283.15 ÷ 0.250 × 288.15
= 16989 ÷ 72.03
= 235.86 L
Therefore, 236 L is the final volume at 0.250 atm.
Learn more about combined gas law here:
https://brainly.com/question/14648508
#SPJ1
Hydrogen gas is collected over water at a total pressure of 95.0kPa. The volume of gas collected is 28.0mL at 25.0˚C. Determine the partial pressure of the hydrogen gas if the water vapor pressure is 3.17kPa.
GAS LAW:
Given:
Unknown:
Formula:
Solution:
The partial pressure of the hydrogen gas, if the water vapor pressure is 3.17kPa is 91.83 kPa.
What is Dalton's law of gas?Dalton's law of gas states that total pressure of the mixture of gas is equal to the sun of the partial pressure of the individual gas.
Given that,
Total pressure of hydrogen gas = 95 kPa
Partial pressure of water vapor = 3.17 kPa
Partial pressure of hydrogen gas will be calculated as:
Partial pressure = 95 - 3.17 = 91.83 kPa
Hence required partial pressure is 91.83 kPa.
To know more about Dalton's law, visit the below link:
https://brainly.com/question/9211800
#SPJ1
If 50 grams of CaCl2 is dissolved in 100g of water at 10 degrees. Is the solution saturated, unsaturated, or supersaturated?
Find solubility
Mass of solute/Mass of solvent×10050/100×10050%So half amount of solute is dissolved .
Hence the solution is saturated
A mole is known by what other name?
Answer: avogadros number/constant
Explanation:
A container with two gases, helium and argon, is 30.0% helium. Calculate the partial pressure of helium and
argon if the total pressure inside the container is 4.00 atm.
Answer:
helium=1,2atm
argon=2,8atm
Explanation:
partial is pressure exerted by each gas in a system since 30% is helium it means 70% is argon
argon =70%x4
helium=30%4
Dalton's law of partial pressure is applicable to only ideal gas not to the vanderwaal gases. The partial pressure of helium and argon is 1.2atm and 2.8atm respectively.
What is Dalton's law of partial pressure?According to Dalton's law of partial pressure, the total pressure of a mixture of gases is equal to the total sum of partial pressure of individual exerting on the walls of the container.
Mathematically,
Partial pressure=total pressure× mole fraction
Total pressure= 4.00 atm
percentage of helium = 30%=0.3
percentage of argon=100-30%=70%=0.7
Substituting the given values in above equation
Partial pressure of helium=4.00 atm× 0.3
Partial pressure of helium=1.2atm
Partial pressure of argon = 4.00 atm× 0.7
Partial pressure of argon = 2.8atm
Therefore, the partial pressure of helium and argon is 1.2atm and 2.8atm respectively.
To know more about Dalton's law of partial pressure, here:
https://brainly.com/question/14119417
#SPJ2
A sealed container of N2 gas has a pressure of 836 kPa at 54.7 ∘ C. After it is left out in the sun the pressure increases by 79.9 kPa. What is the new temperature of the container?
Does the size of the nucleus affect the possibility of nuclear fission or fusion happening?
Mention five characteristics of an ideal fuel
Answer:
Ideal fuel shows the following characteristics:
• It should be less expensive,
• It should be easily available,
• It should produce a large amount of heat,
• It can be transported easily.
• It has high calorific value.
• It should burns easily in air at a moderate rate.
from the following chemical reaction , calculate the moles of mg if 3.5 mol of hcl in reactant mg + 2hcl --> mgcl2 + h2
Describe in your own words, why a balloon, after it has been rubbed on a sweater, floats back towards the sweater when released.
Your answer must contain electric force, attract, electrons, and protons.
Explanation:
By rubbing the balloon on a sweater, you can transfer negative charges onto the surface of the balloon
what type of element is always radioactive?
In an experiment, the same mass of magnesium metal reacted with the same amount of two different acids. the acid used in reaction 1 was ethanoic acid and in reaction 2 it was hydrochloric acid. which reaction produced the most gas?
The mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
What is the mole ratio of a reaction?The mole ratio of a reaction is the ratio in which the reactants and products of a given reaction occur for the reaction to proceed to completion.
The mole ratio of a reaction is also known as the stoichiometry of the reaction.
The equation of the two reactions are given below:
[tex]Mg + 2HCl \rightarrow MgCl_2 + H_2[/tex]
[tex]Mg + 2CH_3COOH \rightarrow (CH_3COO)_2Mg + H_2 \\ [/tex]
From the equation of the reaction reaction, an equal volume of hydrogen gas will be produced by the two reactions.
Therefore, the mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
Learn more about mole ratio at: https://brainly.com/question/19099163
#SPJ1
Sam and Albert reacted 3.5 moles of hydrogen gas with an excess of oxygen and had a percent yield of 85%. How many moles of water did they actually produce
The mole of water Sam and Albert produced would be 3.5 moles
Mole ratioFrom the balanced equation of the reaction:
[tex]2H_2 (g) + O_2 (g) --- > 2H_2O (l)[/tex]
The mole ratio of hydrogen to water is 1:1.
Thus, if 3.5 moles of hydrogen gas is reacted with excess oxygen, 3.5 moles of water will also be produced.
More on mole ratios can be found here: https://brainly.com/question/15288923
#SPJ3
The reaction between bromine and methylpropene is an electrophilic addition. Describe .with the aid of curly arrows ,the mechanism of the reaction. Show that the intermediate and the product along with any dipoles and and lone pair of electron.
Electrophillic addition occurs when the substrate has a double bond and the attacking agent is a electrophile.
What is electrophillic addition?The term electrophillic addition refers to a type of addition that occurs when the substrate has a double bond and the attacking agent is a electrophile.
The mechanism of the electrophillic attack on methyl propene as shown indicates that the attacking agent is an electrophile(Br^+).
Learn more about electrophillic addition:https://brainly.com/question/14755397
#SPJ1
Name these compounds according to IUPAC.
Functional groups are alcohol, carboxylic acids, ester, ketone, etc. The compounds are 2,2 dimethyl propane, 2-methyl butane, and ethanol.
What are functional groups?Functional groups provide specific chemical properties that are linked to the main chain of the compound and define the role of the compound. The first compound has two methyl (CH₃) groups at the second carbon and a total of three carbons making the compound, 2,2 dimethyl propane.
In the second compound, there is a methyl group on the second carbon and total of four carbons making it 2-methyl butane, and the third compound is two carbon with alcohol as the functional group making it ethanol.
Therefore, the compounds are 2,2 dimethyl propane, 2-methyl butane, and ethanol.
Learn more about functional groups here:
https://brainly.com/question/12150493
#SPJ1
How does an unconformity affect our geological knowledge of an area?
Answer:
Because the Earth is always shifting, so research has to constantly be updated.
A change that produces a new substance is a _______ change
Answer is chemical change
Select the compound In which chlorine is assigned the oxidation number +5.
O HCIO
O NACIO 3
O HCIO 2
O HCIO 4
O HCI
correct option is option B
Oxidation state of Na= +1
Oxidation state of O = +2
Let Oxidation state of Cl =x
Then,
(+1) + X + 3×(-2) = 0
X-5 = 0
so x = +5
Select the correct answer.
A compound has a molecular weight of 112.124 atomic mass units and the empirical formula C3H4O. What is the molecular formula of the compound? Use the periodic table to help you.
A.
C6H8O
B.
C9H12O3
C.
C8H4O2
D.
C4H8O2
E.
C6H8O2
.
Answer:
E
Explanation:
The empirical formula has a mass of
3*C = 3*12 = 36
4*H = 4*1 = 4
1*O = 1 * 16 = 16 Add
Total = 56
The actual mass of the molecule in nature is 112
Multiplier = nature's mass / empirical formula mass
Values
Nature's mass = 112
Empirical mass = 56
Solution
Multiplier = Natures mass/Empirical Mass
Multiplier = 112 / 56
Multiplier = 2
Formula
Nature's formula = (Emperical Mass)_multiplier
Nature's formula = (C3H4O)_2 Multiply
Nature's formula = C6H8O2
Check
C6 = 6*C = 6*12 = 72
H8 = 8*H = 8*1 = 8
O2 = 2*O = 2*16 = 32 Add
Total 112 which checks with what is given.
Compounds that contain carbon-hydrogen bonding are collectively termed.
Answer:
collectively they're known as HYDROCARBONS
