Answer:
True
hope this helps
Explanation:
H2+O2 what is the answer
Answer:
H20
Explanation:
2H2 + O2 → 2H2O
H2 + O2 = H2O
Answer:
H ₂O ₂
Explanation:
Hydrogen peroxide
If the four components were ranked from smallest to largest, what would the order be?
*Science*
A: planet, solar system, galaxy, universe
B: planet, galaxy, solar system, universe
C: universe, galaxy, solar system, planet
D: solar system, galaxy, planet, universe
help me :)
2:58
This isn't college! Its science and I'm keeping my grade private so.
Answer:
A
Explanation:
planet, solar system, galaxy, universe
After a reaction went to completion, the crude reaction mixture consisted of two compounds, A and B, which were isolated by extraction. After each compound was dried, their masses were found to be, 117 mg of compound A and 89 mg of compound B. Both compounds were individually recrystallized and weighed again. After recrystallization, the mass of compound A was 91 mg and the mass of compound B was 79 mg.
Calculate the percent recovery from recrystallization for both compounds.
Answer:
Percent recovery of A = 77.78%
Percent recovery of B = 88.8 %
Explanation:
Mass of impure compound A = 117 mg
Mass of impure compound B = 89 mg
Mass of A recovered = 91 mg
Mass of B recovered = 79 mg
Percent recovery of A = 91 mg/117 mg * 100
Percent recovery of A = 77.78%
Percent recovery of B = 79 mg/89 mg * 100
Percent recovery of B = 88.8 %
what is 0.0745 in scientific notation?
Hi! Here's the answer!
7.45E2 OR 7.45*[tex]10^{-2}[/tex]
(im pretty sure im correct, so if you'd like please give me brainly :D)
Draw the Lewis structure for the conjugate acid from the reaction of acetic acid with a generic acid (HA). Draw the molecule by placing atoms on a grid and connecting them with bonds. Include all lone pairs of electrons and any nonzero formal charges.
Answer:
The response to the question is as follows:
Explanation:
The complete query can be found in the attachment file please find it:
plsss i need help asap ill give brainliest!!!
The varlable that a scientist changes when conducting an experiment is called the
variable.
Omanipulated
O dependent
O responding
HELP ASAP
Sulfur dioxide (SO2) gets into the environment from burning of coal and oil. This pollutant is one of the major causes of acid rain, which is associated with the lower pH of soils, lakes, and streams and accelerated corrosion of buildings and monuments. Sulfur dioxide is also a major cause of fine particulate pollution, which is a significant health concern as well as a pollutant that reduces visibility. Given that the electronegativity of oxygen is 3.5 and that of sulfur is 2.5 and the molecule has bent geometry, which of the following best describes the chemical bonding in sulfur dioxide?
A. ionic: transfer of electrons from sulfur to oxygen
B. nonpolar covalent: equal sharing of electrons between sulfur and oxygen
C. polar covalent: electrons shared between sulfur and oxygen but attracted more to the sulfur
D. polar covalent: electrons shared between sulfur and oxygen but attracted more to the oxygen
Answer:
C. polar covalent: electrons shared between sulfur and oxygen but attracted more to the sulfur
Explanation:
Sulfur dioxide is a polar covalent compound. Since oxygen has higher electronegativity, the shared pair of electrons are attracted towards oxygen. Hence, D is correct.
What is covalent bond?A covalent bond is formed between two atoms when they share electrons each other. Sulfur and oxygen are 16th group elements. Both have a valency of two. And shares two electrons each to form double bond.
Electronegativity is the ability of an atomic nucleus to attract the bonded pair electrons When the bonded atoms have significant difference in their electronegativities, the shared pair of electrons attracts towards the more electronegative atom.
The more electron density on one atom and less on other atom make them partially charged and possess a permanent dipole moment making the compound polar.
In SO₂, the shared electrons are attracted towards oxygen which makes the compound polar. Hence, option D is correct.
To find more about covalent bond, refer the link below:
https://brainly.com/question/19382448
#SPJ2
A 0.450 g sample of solid lead(II) nitrate is added to 250 mL of 0.250 M sodium iodide solution. Assume no change in volume of the solution. The chemical reaction that takes place is represented by the following equation. Pb(NO3)2(s) + NaI(aq) → PbI2(s) + NaNO3(aq) How many moles of PbI2 can be produced?/Identify the limiting reactant/If the actual yield was 0.550 g of PbI2, what is the percent yield?
Pb(NO₃)₂ ⇒limiting reactant
moles PbI₂ = 1.36 x 10⁻³
% yield = 87.72%
Further explanationGiven
Reaction(unbalanced)
Pb(NO₃)₂(s) + NaI(aq) → PbI₂(s) + NaNO₃(aq)
Required
moles of PbI₂Limiting reactant% yieldSolution
Balanced equation :
Pb(NO₃)₂(s) + 2NaI(aq) → PbI₂(s) + 2NaNO₃(aq)
mol Pb(NO₃)₂ :
= 0.45 : 331 g/mol
= 1.36 x 10⁻³
mol NaI :
= 250 ml x 0.25 M
= 0.0625
Limiting reactant (mol : coefficient)
Pb(NO₃)₂ : 1.36 x 10⁻³ : 1 = 1.36 x 10⁻³
NaI : 0.0625 : 2 = 0.03125
Pb(NO₃)₂ ⇒limiting reactant(smaller ratio)
moles PbI₂ = moles Pb(NO₃)₂ = 1.36 x 10⁻³(mol ratio 1 : 1)
Mass of PbI₂ :
= mol x MW
= 1.36 x 10⁻³ x 461,01 g/mol
= 0.627 g
% yield = 0.55/0.627 x 100% = 87.72%
A student drops a piece of paper and records the time for the paper to hit the floor. The student then folds the paper in
half and repeats the process. The student does this four more times, each time, folding the paper in half. The student
always drops the paper from the same height.
The independent variable is the:
A. Dimensions of the paper
B. The time to hit the floor
C. The height of the drop
D. The temperature of the room
Answer:
The answer is: A - Dimensions of the paper.
Explanation:
"A" is the independent variable because it is the only thing that you are manipulating in each trial (i.e. folding the paper in half each time). "B" is the dependent variable because it is what you are measuring in every trial. "C" and "D" remain constant (they aren't changed at all) so they are neither dependent or independent variables.
14. How are the molecules in oxygen gas, the molecules in hydrogen gas, and water
molecules similar? How do they differ?
Explanation:
Well molecules are like points there scattered and you have to earn them you know so thanks for the points
Water's heat of fusion is 80. cal/g , its specific heat is 1.0calg⋅∘C, and its heat of vaporization is 540 cal/g .
A canister is filled with 350 g of ice and 100. g of liquid water, both at 0 ∘C . The canister is placed in an oven until all the H2O has boiled off and the canister is empty. How much energy in calories was absorbed?
Answer:
Q1=(330g)*(80cal/g)=26,400cal
Q2=(430cal)*(1cal/(g-c)*(100c=43,000cal
Q3=(430g)*(540 cal/g)= 232,200cal
Total heated absorbed is
Q1+Q2+Q3= 301,600 or 301.6 kcalExplanation:
# I hope it's help
Is pH = 14 an acid, a base, or neutral? PLEASE HURRY
Answer:
it is a acid. the answer is acid
Someone please help and thank you
Answer:
Hot plate
Explanation:
because it is the hottest and can melt the chocolate chips.
How many grams are in 4.25x10^21 molecules of sodium oxide
Answer: 0.37g
Explanation:avogadro number = 6.02214076x10^23 atoms/molecules per mole
a mole of Na2O = 2*23 + 16 = 52 g
4.25x10^21 atoms = 52*(4.25*10^21/6.02214076*10^23) = 0.37 g
Which element easily gains one electron to form a negative ion?
A.
Lithium (Li)
B.
Flourine (F)
C.
Magnesium (Mg)
D.
Nitrogen (N)
1. What is the equality between mL and L?
Answer:
1 liter (L) = 1000 milliliters (mL)
Explanation:
How many valence electrons are in Sil4?
Answer:
12 valence electrons
Explanation:
Number of valence electrons: 2 carbons (2 x 4 valence electrons= 8e-) and 4 hydrogens (4 x 1 valence electron = 4 e-) added up gives us 12 valence electrons to work with: Counting the bonds we have made shows that we have used up 10 of the 12 valence electrons leaving us with 2 to complete the octets.
A base produces OH-1 ions when dissolved in solution
. True
. False
Answer:
i think its true
Explanation:
There are a lot of energy sources found underground. Oil is a liquid, but what is this gas down here called? Natural gas!
We use natural gas to heat our homes and to make electricity. Because it is a gas, what is the best way to transport it?
Answer: The natural gas transmission system is primarily a giant international pipeline network, consisting of large, medium, and small-sized pipes. ... If transport by pipeline is not feasible, then natural gas is usually transported in its liquefied state, which has a temperature of -162 ° C and its density is lower than waters.
Explanation: Potential energy is stored energy and the energy of position. Chemical energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of chemical energy
The measurements below were made on four different balances:
i. 7.5 g
ii. 7.33 g
iii. 7.5201g
iv. 7.490
A student takes a reading from a balance where the display fluctuates between 7.51 g and 7.55 g. Which of the four balances above was used?
a. iv
b. iii
c. i
d. ii
Answer:
d. ii.
Explanation:
Hello!
In this case, according to the displayed decimal placed by each balance, we can notice that:
i. Displays 1 decimal place.
ii. Displays 2 decimal places.
iii. Displays 4 decimal places.
iv. Displays 3 decimal places.
Thus, since the measured-out masses have two decimal places each, we infer that the used balance was d. ii as it displays two decimal places.
Best regards!
Which chemical reaction is correctly balanced? *
a. CH4 +2O2 → CO2 +2H2O
b. 2CH4 +2O2 → CO2 +2H2O
c. CH4 +O2 → CO2 +H2O
d. None of the above
Which chemical reaction is correctly balanced? *
a. CH4 +2O2 → CO2 +2H2O
b. 2CH4 +2O2 → CO2 +2H2O
c. CH4 +O2 → CO2 +H2O
d. None of the above
Explanation:
d none of the above
Answer:
The answer is a. CH4 + 2O2 --- CO2 + 2H2O
Explanation:
A balanced chemical reaction must have the same number of each type of atom on both sides according to the law of conservation of mass:
1 carbon 4 hydrogen + 4 oxygen ----- 1 carbon 2 oxygen + 4 hydrogen
2 oxygen =
1 carbon 4 hydrogen 4 oxygen ---- 1 carbon 4 hydrogen 4 oxygen
Since each type of atom has the same amount on both sides, the chemical formula is balanced.
Under what conditions would wind blow weakly or very little?
50 Points and Brainliest for right answer
Answer:
A gentle wind or when the wind blows slowly, it is called a breeze.
Explanation:
Breezes are the result of differences in air temperature. Warm air rises, leaving behind low pressure near the ground. Cold air creates high pressure and sinks to compensate; wind then blows from areas of high pressure to areas of low pressure to try to equalize pressures.
Answer:
under low pressure of air makes wind blow weakly or very little.
If the Titan lake froze, how would the change in kinetic energy attect the speed of the more
found in the lake?
The speed of the molecules in the lake will decrease due to decrease in the kinetic energy.
What is kinetic energy?Kinetic energy is the energy due to the motion of particles.
Kinetic energy increases with increase in temperature.
Since the temperature of the lake decreases ad it freezes, the kinetic energy decrease and the speed of the molecules in the lake will decrease.
Learn more about Kinetic energy at: https://brainly.com/question/25959744
An ionic compound forms between atoms when they _________ or ________ electrons.
Answer:
lose or gain electrons
Explanation:
A scientist wants to monitor the amount of acid
precipitation falling into a watershed.
Which tool would be the best for the scientist to use?
A. pH meter
B. Dissolved oxygen sensor
C. Satellite images
D. Bioindicators
Answer:
ph meter
Explanation:
i just did this question
Answer: ph meter
Explanation: just did the quiz too
Suppose you were to construct a barometer using a fluid with a density of 1.22 g/mL. How high would the liquid level be in this barometer if the atmospheric pressure was 755 torr? (Mercury has a density of 13.6 g/mL.)
Answer:
The liquid in this barometer would be 8416.393 milimeters.
Explanation:
Since hydrostatic pressure is directly proportional to fluid density ([tex]\rho[/tex]), measured in grams per mililiter, and height of fluid ([tex]h[/tex]), measured in milimeters. Two barometers with distinct fluids are equivalent when both have the same hydrostatic pressure. Then, we construct the following relationship:
[tex]\rho_{w}\cdot h_{w} = \rho_{Hg}\cdot h_{Hg}[/tex] (1)
Where:
[tex]\rho_{w}[/tex], [tex]\rho_{Hg}[/tex] - Densities of fluid and mercury, measured in grams per mililiter.
[tex]h_{w}[/tex], [tex]h_{Hg}[/tex] - Heights of fluid and mercury columns, measured in milimeters.
If we know that [tex]\rho_{w} = 1.22\,\frac{g}{mL}[/tex], [tex]\rho_{Hg} = 13.6\,\frac{g}{mL}[/tex] and [tex]h_{Hg} = 755\,mm[/tex], then the liquid level of this barometer is:
[tex]h_{w} = \frac{\rho_{Hg}\cdot h_{Hg}}{\rho_{w}}[/tex]
[tex]h_{w} = \frac{\left(13.6\,\frac{g}{mL} \right)\cdot (755\,mm)}{1.22\,\frac{g}{mL} }[/tex]
[tex]h_{w} = 8416.393\,mm[/tex]
The liquid in this barometer would be 8416.393 milimeters.
Helpppp 20 Points!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
if i am right it should be east North america
In the process of underwater welding, a gas bubble is intentionally formed around the weld to protect it from water until it has cooled. To do so, a mixture of gas is used containing mole fractions of χH2=0.70 (70% hydrogen), χCO2=0.25 (25% carbon dioxide), and χCO=0.05 (5% carbon monoxide). If the total pressure on this gas bubble is 2.6 atm, what are the partial pressures of the three component gases (in atm)?
Answer:
See explanation
Explanation:
Total number of moles of gases in the mixture; 0.70 + 0.25 + 0.05 = 1 mole
Partial pressure= mole fraction of gas × total pressure
Mole fraction of hydrogen = 0.7/1 × 2.6 = 1.82 atm
Mole fraction of CO2 = 0.25/1 × 2.6 = 0.65 atm
Mole fraction of CO= 0.05/1 × 2.6 = 0.13 atm
help 12 points yes sir people
Answer:
glaciers seem like it would make sence
