Answer:
C
6
H
14
Explanation:
Select the correct mass for each of the samples described below.
3.01 × 1023 molecules H2O
Answer:
9.00 g H2O
Explanation:
Convert molecules to grams using stoichiometry
(3.01 * 10^23 molecules) * (1 mole H2O / 6.022 * 10^23 molecules) * (18.01 g / 1 mole H2O) = 9.00 g H2O
Answer:
answer in picture
Explanation:
Al+3 and I-
what is the chemical formula and what is the name of the compound
Answer:
AlI3 is the chemical formula and the name of compound is Aluminium iodide.
How many moles of hydrogen gas (H2) are required to react completely with 0.75 moles of nitrogen
gas (N2)?
Answer:
2.25 moles H2
Explanation:
The equation N2+ 3H2 > 2NH3
1 mol of N2 gives 3 mol of H2
Then
. 75 mole N2 give 3*.75 = 2.25 moles of H2
Need help on this question asap pleasee
A sample of neon gas occupies 4.5 L of gas at 1.63 atm. What will be the volume if the pressure changes to 2.4 atm
Answer:
[tex]\boxed {\boxed {\sf 3.1 \ liters}}[/tex]
Explanation:
This question asks us to find the new volume if the pressure changes. Therefore, we use Boyle's Law, which states that pressure and the volume of the gas are inversely proportional. The formula is:
[tex]P_1V_1=P_2V_2[/tex]
We know that the original sample of gas occupies 4.5 liters at a pressure of 1.63 atmospheres. We know that the pressure was changed to 2.4 atmospheres, but we don't know the volume. Substitute all known values into the formula.
[tex]4.5 \ L * 1.63 \ atm= 2.4 \ atm * V_2[/tex]
Since we are solving for the new volume (V₂), we need to isolate the variable. It is being multiplied by 2.4 atmospheres and the inverse of multiplication is division. Divide both sides by 2.4 atm.
[tex]\frac {4.5 \ L * 1.63 \ atm}{2.4 \ atm}= \frac{2.4 \ atm * V_2}{2.4 \ atm}[/tex]
[tex]\frac {4.5 \ L * 1.63 \ atm}{2.4 \ atm}= V_2[/tex]
The units of atmospheres (atm) cancel.
[tex]\frac {4.5 \ L * 1.63 }{2.4 }=V_2[/tex]
[tex]\frac {7.335 \ L}{2.4 }=V_2[/tex]
[tex]3.05625 \ L= V_2[/tex]
The smallest number of significant figures in the original measurements is 2, so our answer must have the same. For the number we found, that is the tenths place.
The 5 in the hundredth place tells us to round the 0 up to a 1.
[tex]3.1 \ L = V_2[/tex]
The volume of the neon gas when the pressure is changed to 2.4 atmospheres is 3.1 Liters.
Explanation:
BY USING BOYLE'S LAW , WE KNOW THAT[tex]P1V1 = P2V2[/tex]
[tex]P1=1.63atm
\\ V1=4.5 L
\\ P2=2.4 atm
\\ V2=?[/tex]
[tex]V2 = \frac{1.63 \times 4.5}{2.4} [/tex]
[tex]V2 = 3.05625 \: Litres[/tex]
HOPE IT HELPS YOUif 67.8 moles of gas was measured out into a helium balloon how many molecules would be present within the balloon
Answer:
[tex]4.08x10^{25} molecules[/tex]
Explanation:
Hello there!
In this case, since the understanding of the mole-molecules relationships is analyzed via the Avogadro's number:
[tex]1mol=6.022x10^{23}molecules[/tex]
Next, we can solve the following setup by starting with the 67.8 moles of helium and obtaining the required molecules as follows:
[tex]67.8mol*\frac{6.022x10^{23}molecules}{1mol}\\\\=4.08x10^{25} molecules[/tex]
Best regards!
which word means the opposite of boiling melting
What are some ways organisms in a cave can receive nutrients?
Pls help!!!!
PLEASEEE HELP THIS IS SCIENCE
I WILL MARK U BRAINLIEST OF UR CORRECT
Answer:
1. C
2. B
3. B
4. Graph b, option D
Explanation:
Answer:
11. chloroplasts and a cell wall
17. microbes
1. increased
2. Graph b
Explanation:
I put them in the order u asked the questions btw.
What volume of NaOH(aq) would be needed to reach the equivalence point if the concentration of the added base were 0.290 M?
Answer:
17.2mL are needed
Explanation:
The pH curve for titration of 50.0 mL of a 0.100 M solution of hydrochloric acid
A strong acid as HCl reacts with a strong base as NaOH producing water and a salt. The chemical equation is:
HCl + NaOH → H₂O + NaCl
Where 1 mole of HCl reacts per mole of NaOH
To solve this question we must find the moles of HCl added = Moles NaOH you must add to reach the equivalence point. With these moles and the molar concentration we can find the volume that would be needed as follows:
Moles HCl:
50.0mL = 0.0500L * (0.100moles / L) = 0.00500 moles HCl = Moles NaOH
Volume NaOH:
0.00500 moles NaOH * (1L / 0.290moles) = 0.0172L NaOH =
17.2mL are neededLily placed a steel knife, a plastic knife and a wooden knife across a glass filled with hot water. She took three equal blobs of butter and placed them on each of these knives. The butter placed on which knife will melt first ?
Answer:
the steel knife, because it's metal.
The sun has been up for several hours , and it has been shining on these trees . What can the trees do because they are in sunlight?what does this mean for the number of energy storage molecules in trees?
A. Give off air. Giving off carbon allows them to make energy storage molecules
B.give off. Giving off carbon uses up energy storage molecules
C.take in carbon from the air . The carbon s used to make energy storage molecules
D.take in carbon from the air , the carbon is used to break down energy storage molecules.
E. None of Above.
Which part of the atom is most directly involved in chemical bonding?
Answer:
Electron
Explanation:
The reaction given below is in equilibrium.
302(g) + 68kcal A 203(8)
Which of the following applications increase O3 production?
o Increasing pressure and decreasing temperature
O Decreasing temperature and pressure
O Decreasing temperature and increasing the amount of O2
O Adding a catalyst
o Increasing temperature and pressure
Answer:
not sure o. increasing pressure and decreasing temperature
3. Calculate the molar mass of
Hg2(NO3)3
The molar mass of Hg2(NO3)3 is 587.1947 g/mol
My source was wrong.
Answer:
molar mass: 587.1947
Explanation:
Element Symbol Atomic weight Atoms Mass percent
Mercury Hg 200.59 2 68.3215
Nitrogen N 14.0067 3 7.1561
Oxygen O 15.9994 9 24.5225
What is the molar mass of C 10 H 16 ? Show math Hurry
Answer:
136.24 g/mol is the molecular mass of c10h16
Which of the following will neutralize an acid?
Question 20 options:
a)
LiOH
b)
H2O
c)
H2SO4
d)
HCl
(Thermodynamics question) When dynamite and oxygen create an explosion, the q value for the system (reactants), would be __
a. positive
b. negative
c. zero
Which diagram correctly shows the orbits of the Sun, Earth, and Moon in the geocentric model of the solar system?
Answer:
A.
Explanation:
This is the closest to what Ptolemy drew.
B would have the sun and moon in equal orbits, but the moon changes wouldn't be accounted for
C and D have the sun in the middle, so they are both heliocentric.
The diagram that correctly shows the orbits of the Sun, Earth, and Moon in the geocentric model of the solar system is A and the correct option is option A.
What is Geocentric model of Solar System?In the geocentric model of the solar system, the Earth is considered to be the center of the solar system.
The Moon, the planets, the Sun, and the stars all rotate around the Earth (which stays still), with uniform circular motion. They compose the heavens, which are considered to be ethereal and unchanging.
Therefore, the diagram that correctly shows the orbits of the Sun, Earth, and Moon in the geocentric model of the solar system is A and the correct option is option A.
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What change has occurred since the Industrial Revolution that has potentially caused a change in Earth’s average climate?
Answer:
Greenhouse gases in the atmosphere absorb heat radiation. Human activity has increased greenhouse gases in the atmosphere since the Industrial Revolution, leading to more heat retention and an increase in surface temperatures.
If you start with 30.0 grams of sodium fluoride, how many grams of magnesium fluoride will be produced?
Answer:
22.2 g of MgF₂
Explanation:
We star from the reaction:
NaF → sodium fluoride
Mg → Magnesium
2NaF + Mg → MgF₂ + 2Na
2 moles of sodium fluoride react to 1 mol of Mg in order to produce 1 mol of magnesium fluoride and 2 moles of sodium.
We convert mass of the reactant to moles:
30 g . 1mol / 41.98 g = 0.715 mol
We assume that Mg is in excess
As ratio is 2:1, if we have 0.715 moles of NaF we may produce the half of moles, of MgF₂
0.715 mol /2 = 0.357 moles of MgF₂
We convert moles to mass: 0.357 mol . 62.30g /mol = 22.2 g
is this correct? also for the mass i have to round it to the closest whole number
That big lorry hit the new car.change to passive voice
A loose pile of rocks and soil travels in a single large mass the mass moves a short distance downhill which mass movement does this describe
A. Creep
B. Erosion
C. Landslide
D. Slump
Which of the following naming systems would you use to nameHClO2?
Question 6 options:
a)
HYDRO________IC ACID
b)
HYDROGEN _________IDE
c)
________________IC ACID
d)
________________OUS ACID
why there might be something else in the water besides the reddish-brown substance?
Answer:
Tbe reddish brown substance might be the rust that formed overtime in a iron tap and over the course of time mixed with other dust and particles it might have formed another substance .
The reddish brown substance is iron oxide which is formed by the reaction of iron materials with water and air. This oxide layer above the surface of metallic parts is called rust.
What is iron oxide ?The Fe is a reddish metal more reactive towards the air and water as well. Fe is a very common in the manufacturing of many household materials. However, by the action of air and water these metallic parts undergo corrosion.
Corrosion is a chemical change involving the formation of oxide layer over the metallic surface which eventually corrode the substance and make it unusable.
Fe reacts with oxygen of water or air forming the reddish brown iron oxide Fe₂O₃ that is what called the rust. Rust can be seen in needles, vehicle parts made of iron etc.
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Which is an example of a nonaqueous solution?
gasoline
fog
mayonnaise
fruit juice
Answer: Gasoline
Explanation: Siri said so
The non-aqueous means it does not contain water. Among the given options gasoline is an example of a non-aqueous solution. The correct option is A.
What is a non-aqueous solution?The solution which is obtained by dissolving solute in any liquid other than water is defined as the non-aqueous solution. If solute is dissolved in solvent like benzene, alcohol, ether, carbon disulphide, acetone etc. forms a non aqueous solution.
The major difference between the aqueous and non-aqueous solution is that the solvent of an aqueous solution is water whereas in non-aqueous solutions, the solvent is any substance other than water.
The solvent of non-aqueous solution can be polar or nonpolar and depending on the polarity the solutes dissolve in the solvent. Here gasoline is an example of the non-aqueous solution. The gasoline is a crude oil which does not include water as an ingredient.
Thus the correct option is A.
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Clouds are made up of tiny droplets of water. Which two spheres are clouds a
part of?
A. Biosphere
B. Geosphere
C. Hydrosphere
D. Atmosphere
Germanium has a face-centered cubic unit cell. The density of germanium is 5.32 g/cm3. Calculate a value for the atomic radius of germanium.
Answer:
1.59x10⁻¹⁰m
Explanation:
To solve this question we must know that the length of the cubic cell, X, is equal to:
X = √8 * R
Where R is the atomic radius of germanium
And that in 1 unit cell there are 4 atoms of germanium.
To solve this question we must find the mass in 1 unit cell, with this mass we can find the volume of the cube and the length. With the length we can know the atomic radius:
Mass in 1 unit cell -Molar mass Ge = 72.64g/mol:
4 atoms Ge * (1mol / 6.022x10²³ atoms) = 6.64x10⁻²⁴ moles Ge
6.64x10⁻²⁴ moles Ge * (72.64g / mol) = 4.825x10⁻²²g Ge
Volume unit cell:
4.825x10⁻²²g Ge * (1cm³ / 5.32g) = 9.07x10⁻²³cm³
Length unit cell:
∛9.07x10⁻²³cm³ = 4.49x10⁻⁸cm * (1m / 100cm) = 4.49x10⁻¹⁰m
Atomic radius Ge:
4.49x10⁻¹⁰m / √8 =
1.59x10⁻¹⁰mS + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2O
In the above equation, how many grams of water can be made when 1.1 moles of HNO3 are consumed?
Answer:
[tex]fro \: the \: equation : \\ 6 \: moles \: of \: nitric \: acid \: produce \: 2 \: moles \: of \: water \\ 1.1 \: moles \: of \: nitric \: acid \: react \: with \: ( \frac{1.1}{6} \times 2) \: moles \\ = 0.367 \: moles \: of \: water \\ 1 \: mole \: of \: water \: weighe \: 18 \: g \\ 0.367 \: moles \: will \: weigh \: ( 0.367 \times 18) \: g \\ = 6.6 \: g \: of \: water[/tex]