Answer:
2
Explanation:
it has a total of 17 valence electrons
What are the two sources of electricity? (Supposed to be found in a Bill Nye video)
Answer:
The three major categories of energy for electricity generation are fossil fuels (coal, natural gas, and petroleum)
Explanation:
:)
2S + 302 - 2503
What type of reaction
Answer: Synthesis
Explanation:
Whenever two reactants react to form one product, it is a synthesis.
A sample of a hydrocarbon is found to contain 7.48g carbon and 2.52g hydrogen. What is the empirical
formula for this compound?
Answer:
CH₄
Explanation:
To determine the empirical formula of the hydrocarbon, we need to follow a series of steps.
Step 1: Determine the mass of the compound
The mass of the compound is equal to the sum of the masses of the elements that form it.
m(CxHy) = mC + mH = 7.48 g + 2.52 g = 10.00 g
Step 2: Calculate the percent by mass of each element
%C = mC / mCxHy × 100% = 7.48 g / 10.00 g × 100% = 74.8%
%H = mH / mCxHy × 100% = 2.52 g / 10.00 g × 100% = 25.2%
Step 3: Divide each percentage by the atomic mass of the element
C: 74.8/12.01 = 6.23
H: 25.2/1.01 = 24.95
Step 4: Divide both numbers by the smallest one, i.e. 6.23
C: 6.23/6.23 = 1
H: 24.95/6.23 ≈ 4
The empirical formula of the hydrocarbon is CH₄.
How many molecules are there in 3 moles of aluminum chloride ?
there are 4 atoms in aluminum chloride
What quality is attributed to water due to “capillary action”?
A. change of liquid water into gaseous phase
B. the ability of water molecules to adhere to the surfaces of objects
C. high volatility
D. vapor pressure
Answer:
I think it's B. The ability of water molecules to adhere to the surfaces of objects
You need to make 7.2 L of 0.8 M Ca(C2O4) What molarity would the Ca(C2O4) need to be if you were to use only 3.5 L of it ?
Show work
Answer:
i think its 7.4
Explanation:j
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what is the most metallic item on the pterotic table
Answer:
francium or cesium
A radioactive sample contains two different types of radioactive nuclei: A, with half-life 5.0 days, and B, with half-life 30.0 days. Initially, the decay rate of the A-type nucleus is 64 times that of the B-type nucleus. When will their decay rates be equal
Answer:
t = 39.42 days
Explanation:
To do this, we need to use the general expression for decay rate:
R = R₀ exp(-λt) (1)
According to the problem, decay rate of A initially is 64 times rate of B, so we can say the following:
A₀ = 64B₀ (2)
The value of λ can be determined using:
λ = ln2 / t(1/2) (3)
Let's calculate first the value of λ for each nuclei:
For A: λ₁ = ln2 / 5 = 0.1286 day⁻¹
For B: λ₂ = ln2 / 30 = 0.0231 day⁻¹
Now, let's write an expression using (1) for each nuclei.
A = A₀ exp(-0.1286t)
A = 64B₀ exp(-0.1286t) (3)
B = B₀ exp(-0.0231t) (4)
We want to know the time when A = B , therefore, we can actually equals (3) and (4) and solve for t:
64B₀ exp(-0.1286t) = B₀ exp(-0.0231t)
64 exp(-0.1286t) = exp(-0.0231t)
ln(64 * exp(-0.1286t)) = ln(exp(-0.0231t))
ln64 + ln(exp(-0.1286t))= -0.0231t
4.1589 - 0.1286t = -0.0231t
4.1589 = (0.1286 - 0.0231)t
t = 4.1589 / 0.1055
t = 39.42 daysSo, in 39 days, the decay rates of A and B will be the same.
Hope this helps
No bots No bots No bots No bots
Answer:
Solution given:
8.
4 hydrogen 1 oxygen
9.
4 hydrogen
2oxygen
Required reaction is:
2H2+O2➔2H2O
now
10.
oxygen have 16 amu than total mass in the left side of oxygen is:
16×2=32 amu of Oxygen
11.
total mass of Oxygen in product side is;
16×2=32 amu of Oxygen
What is the pH of a solution with a [H+] = 2.5 x 10-8 M?
Answer:
7.6Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]ph = - log(2.5 \times {10}^{ - 8} ) \\ = 7.60205[/tex]
We have the final answer as
7.6
Hope this helps you
Friction. That was the topic Sally and Sue are investigating in science. They used a small car and a ramp as seen in the
picture above. They knew that they slipped easily on waxed floors but not on carpet, so they decided change the
material on the surface of the ramp. They planned to use glass, carpet, aluminum foil, and sandpaper and run the car
down the ramp over each surface. The girls wrote a research question: Do rougher surfaces tend to create more
friction than smoother surfaces? They predicted that the greater the friction, the slower the car would travel down the
ramp
What would be the BEST hypothesis for their experiment?
A)
The smoother the ramp surface, the greater the car's speed.
B)
Heavier cars travel down the ramp faster than lighter cars.
The greater the angle of the ramp, the faster the car will move.
D)
Without lubrication, the car will travel slowest down the sandpaper
covered ramp.
Answer: A: The smoother the ramp surface, the greater the car's speed.
Explanation: I did the USA test prep
How is weather ,climate , and biodiversity on earth interconnected?
Answer:
Biodiversity can be seen within species, between species, and within and between ecosystems. Although biodiversity is hard to measure on a global scale, in recent years there has been scientific consensus that the planet’s biodiversity is in decline. That’s not great news, because in general, the more species that live in an area, the healthier that ecosystem is—and the better off we humans are.
Explanation:
Draw the major organic product in the reaction scheme. Be sure to clearly show stereochemistry (if applicable). The starting material is an alkyne where carbon 1 is bonded to cyclopentane and carbon 2 is bonded to H. Step 1 is N a N H 2. Step 2 is C H 3 I. Step 3 is sodium in liquid ammonia. Draw the major organic product.
Answer:
See answer below
Explanation:
The picture below will show you the final product and mechanism.
In the first step, the NaNH₂ is a strong base, so, this base will substract the hydrogen from carbon 2, to generate a negative charge there, and then, carbon 2 becomes a nucleophyle.
As a nucleophyle it will attack to the CH₃I in the next step, and it will attach to the CH₃.
The second step is just a regular step to reduce the triple bond of the alkyne to alkane or alkene, this will depend on the quantity of the reactant. In this case, an alkene.
Hope this helps,,,,,,k
How is matter classified,Give example for each?
Matter can be classified into 2 groups, Pure substance and Mixture.
Pure substance is a type of matter with "the same physical and chemical properties throughout the sample". Examples include tin, copper, oxygen, chlorine.
Mixtures on the other hand, are two or more combined substances that can be seperated. Some examples include smog, mud, sea water and air.
give an example of a primary income from the rest of the world
Answer:
(1) Income Associated with the Production Process
(a) Compensation of employees
(b) Taxes and subsidies on products and
production .
(2) Property Income
(a) Investment income:
• Dividends and withdrawals from income of
quasi-corporations
• Reinvested earnings
• Interest
(b) Rent .
I hope this is correct :-)
Pls give theeee answerrrrrrrr
How many moles of lithium hydroxide are required to react with 19.2 mol CO2, the average amount exhaled by a person each day?
Answer:
38.4 mol LiOH
Explanation:
Step 1: Write the balanced neutralization equation
2 LiOH + CO₂ ⇒ Li₂CO₃ + H₂O
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of LiOH to CO₂ is 2:1.
Step 3: Calculate how many moles of lithium hydroxide are required to react with 19.2 mol CO₂
19.2 mol CO₂ × 2 mol LiOH / 1 mol CO₂ = 38.4 mol LiOH
In the energy profile of a reaction, the species that exists at the maximum on the curve is called the ________. In the energy profile of a reaction, the species that exists at the maximum on the curve is called the ________. atomic state activated complex activation energy enthalpy of reaction product
Answer:
The activated complex
Explanation:
The activated complex are the species that exists maximum in every energy profile of a reaction.
Activated complex is nothing but an intermediate state of reactants formed during its conversion from a reactant to product state in coarse of reaction.
The activated complex is formed at the maximum energy level in the reaction path. And this difference between energy of the activated complex and the energy of the reactants is only known as activation energy
What new evidence led scientists to change their minds about the geocentric model?
Galileo disproved the Ptolemaic theory, sanctioned for centuries by the Church, which held the Earth to be the central and principal object in the universe, about which all celestial objects orbited.
The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.
What is Geocentric Model?Geocentric model is any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all.
This model is often named Ptolemaic model after its most famous supporter, the Greco-Roman astronomer Ptolemy.
The geocentric is often referred to as the Medieval view of the universe and it dominated thinking into the early modern age.
Therefore, The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.
Learn more about Geocentric Model, here:
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Diazonium salts are explosively reactive intermediates for synthetic chemical reactions that must be handled with great care. These salts can decompose generating lots of heat and explosive generation of nitrogen gas. What can you predict about the thermodynamics of these reactions
Answer:
Exothermic Reactions are taking place in this question
Explanation:
The chemical reaction mentioned in this question is Exothermic reaction as it releases heat and is explosive in nature.
In fact exothermic reactions can release both heat and light. In such reactions the total energy of the products is less than the total energy of the reactants.
Determine the number of grams of solute needed to make each of the following molal solutions.
Answer:
a. 497g H2SO4.
b. 124g HNO3
Explanation:
Molality, m, is an unit of concentration defined as the moles of solute per kg of solvent.
a. The moles of solute, H2SO4 are:
1.16kg * (4.37mol / kg) = 5.07 moles H2SO4
Mass -Molar mass H2SO4: 98g/mol-
5.07 moles H2SO4 * (98g / mol) = 497g H2SO4
b. The moles of solute, HNO3 are:
1.97kg * (1.00mol / kg) = 1.97 moles HNO3
Mass -Molar mass HNO3: 63.01g/mol-
1.97 moles HNO3 * (63.01g / mol) = 124g HNO3
Magnesium hydroxide and sodium hydroxide are both strong bases. The pH of a saturated solution of sodium hydroxide is greater than 14. The pH of a saturated
solution of magnesium hydroxide is about 10.2. Why do the solutions have different pH values?
Answer: Solubility of NaOH is greater and there are more OH- ions in solution.
Explanation: Reactions : NaOH (s) ⇒ Na+ (aq) + OH- (aq)
Mg(OH)2 (s) ⇒ Mg2+ (aq) + 2 OH-(aq)
Although in same amount of moles, Mg(OH)2 produces
two (OH-)-ions in water solution, solubility of Mq(OH)2 is smaller.
Concentration [OH-]ions is smaller in saturated water solution
of Mg(OH)2
Find the molarity of iodide ions in a solution obtained by dissolving 1.97 g of ZnI2(s) and enough water to form 34.2 mL of solution. Assume complete dissociation of ZnI2(aq) into ions. The molar mass of ZnI2 is 319.22 g/mol. Give the answer in mol/L with 3 or more significant figures.
Answer: The molarity of iodide ions in given solution is 0.181 M.
Explanation:
Given: Mass = 1.97 g
Volume = 34.2 mL (1 mL = 0.001 L) = 0.0342 L
Molar mass of [tex]ZnI_{2}[/tex] = 319.22 g/mol
Moles is the mass of substance divided by its molar mass. Hence, moles of [tex]ZnI_{2}[/tex] are calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{1.97 g}{319.22 g/mol}\\= 0.0062 mol[/tex]
Molarity is the number of moles of a substance present in liter of a solution.
So, molarity of given solution is calculated as follows.
[tex]Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.0062 mol}{0.0342 L}\\= 0.181 M[/tex]
Thus, we can conclude that molarity of iodide ions in given solution is 0.181 M.
Why do we need cells to divide? Give two examples.
Answer:
Cells need to divide to reproduce.
Explanation:
They go through numerous stages, such as mitosis to further replicate themselves. They can't get things done alone, so they have to work in numbers.
17. Explain why chlorine gas can be prepared by electrolyzing an aqueous solution of NaCl
but fluorine gas cannot be prepared by electrolyzing an aqueous solution of NaF.
Answer:
Fluorine gas reacts with water.
.......state Hess law
Help plz:)))I’ll mark u Brainliest
Answer:
Explanation:
We want the energy required for the transition:
CO 2 ( s ) + Δ → C O 2 ( g )
Explanation:
We assume that the temperature of the gas and the solid are EQUAL.
And thus we simply have to work out the product:
2 × 10^ 3 ⋅ g × 196.3 ⋅ J ⋅ g − 1 to get an answer in Joules as required.
What would be the energy change for the reverse transition:
C O 2 ( g ) + → C O 2 ( s ) ?
Which of the following alcohols would be the
least miscible with water?
1. methanol (CH3OH)
2. pentanol (CH3CH2CH2CH2CH2OH)
3. ethanol (CH3CH2OH)
4. hexanol (CH3CH2CH2CH2CH2CH2OH)
5. propanol (CH3CH2CH2OH)
Answer:
im not entirely sure but its 3, pentalnol
Hexanol will be the least miscible in the water. Option D is correct.
What is Solubility?
It is the property of a compound to form a homogenous mixture when mixed with a liquid solvent.
The solubility of alcolol is reduced with an increase in the length of the carbon chain.
Therefore, hexanol will be the least miscible in the water because it has the largest carbon chain among the given molecules.
Learn more about Solubility:
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A saturated solution of sucrose in 500.0 mL of boiling water is cooled to 20.0 0C. What mass of rock candy will be formed?
Answer:
1280.5g
Explanation:
why is it better to only dehydrate one hand at a time
Answer:
I don't think it works like that dawg
