Answers
Answer: You forgot to zero the balance
Explanation:
Related Questions
Scientists often use controlled experiments to answer questions. Choose ALL correct statements about controlled experiments. A) No changes are made to a test group in an experiment. B) A control group is used for comparison to other groups. C) Only one change can be made per test group in an experiment. D) Changes can only be made to the control group in an experiment. E) A controlled experiment must have a control group and test group(s).
Answers
Answer:
B) A control group is used for comparison to other groups.
E) A controlled experiment must have a control group and test group(s).
Explanation:
Answer:
B & E should be the answers
State the coefficient required to correctly balance the following chemical equation:
_____ Ca3(PO4)2+ _____ NaCl ---------> _____ Na3PO4 + _____ CaCl2
Answers
Answer:
1 Ca3(PO4)2+ 6 NaCl ---------> 2 Na3PO4 + 3 CaCl2
The energy we get from the sun is called THERMAL ENERGY and the energy from the Earth is called SOLAR RADIATION.
True
or
False
Answers
The solar radiation that reaches the Earth's surface without being diffused is called direct beam solar radiation. The sum of the diffuse and direct solar radiation is called global solar radiation. Atmospheric conditions can reduce direct beam radiation by 10% on clear, dry days and by 100% during thick, cloudy days.
The only three colors of light the human eye can detect are red, green, and blue.
O True
O False
Answers
which is the best explanation for why organisms must meet their needs for resources?
a. So they can have more entertainment.
b. So they can survive and reproduce.
c. So they can continue sleeping all day.
d. So they can swim and fly faster.
Answers
Answer:
B
Explanation:
A isnt correct because animals have no emotions
C isnt correct because animals dont sleep all day
D isnt correct because not all organisms can swim or fly
B makes the most sense
CAN SOMEONE PLEASE HELP ME I WILL MARK AS BRAINLIEST :(
Answers
Answer:
ok so i did the problem and the answer was 8e+29
Explanation:
i dont really know what the answer is but thats the answer i got
sorry if this didnt help
2. Nitric oxide, NO, is made from the oxidation of NH3, and the reaction is represented by the equation:
4NH3 + 502 → 4NO + 6H2O
What mass of NO can be produced from 6.82 g of NH3?
Need asap, will give brainliest
Answers
Answer:
give me branlist it is 120nh
The burning of fossil fuels, like coal, oil, and natural gas, DO NOT contribute to the presence of greenhouse gases in the atmosphere.
True
or
False
Answers
Answer:
false statements because they are all nonrenewable resources
PLZ HELP URGENT!!!!!
Answers
Answer:
A fluke because it is an vertebrae
Explanation:
In cells, the role of the mitochondrion is to:
Question 8 options:
keep the DNA enclosed
allow nutrients to come into the cell
make proteins
produce energy
Answers
Answer:
D produce energy
Explanation:
Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions.
Answer:produce energy
Explanation:
What is the mole ratio of nitrogen (N2) to ammonia (NH3)?
N2 + 3 H2 → 2 NH3
a.2:3
b3:1
c.3:2
d.1:3
Answers
What is the molar mass of V(CO3)2?
Answers
Just like the other person said ^, hope its right
why blood is separated into different parts
Answers
Answer:
Blood fractionation is the process of fractionating whole blood, or separating it into its component parts. This is typically done by centrifuging the blood. The resulting components are: a clear solution of blood plasma in the upper phase (which can be separated into its own fractions, see Blood plasma fractionation),
Answer: Centrifugal force is used to separate the components of blood – red blood cells, platelets and plasma – from each other. ... The red blood cells precipitate to the bottom of the bag, with the platelets above them, then the white blood cells and the plasma at the very top. Also because Each part of the blood has a different function. Separating the blood into parts lets patients get only the specific part or parts of the blood that they need. So a whole blood donation can be used for several patients.
Hope this helps have a awesome day/nigh❤️✨t
Explanation:
When a 17.9 mL sample of a 0.458 M aqueous nitrous acid solution is titrated with a 0.368 M aqueous potassium hydroxide solution, what is the pH after 33.4 mL of potassium hydroxide have been added
Answers
Answer:
pH = 12.90
Explanation:
THe reaction of HNO₃ with KOH is:
HNO₂ + KOH → KNO₂ + H₂O
That means 1 mole of nitrous acid reacts per mole of potassium hydroxide.
To solve this question, we need to find the moles of each reactant:
Moles HNO₂:
0.0179L * (0.458mol / L) = 0.00820 moles
Moles KOH:
0.0334L * (0.368mol / L) = 0.01229 moles
That means KOH is in excess. The moles in excess are:
0.01229 moles - 0.00820 moles = 0.00409 moles KOH = Moles OH⁻
The [OH⁻] is -Total volume = 17.9mL+33.4mL = 51.3mL = 0.0513L-:
0.00409 moles / 0.0513L =
0.0797M =[OH⁻]
pOH = -log[OH⁻] = 1.098
pH = 14 - pOH
pH = 12.90Identify the compound that contains an ionic bond.
*
O
H20
O CO2
O Naci
O CH3CH2OH
Answers
Answer:
Nacl compound contain ionic bonds because sodium is metal and chlorin is nonmetal
PLEASE ANSWER!! THANK YA!
Using Graham's Law of Effusion, calculate
the approximate time it would take for
1.0 L of argon gas to effuse, if 1.0 L of
oxygen gas took 12.7 minutes to effuse
through the same opening.
Answers
Answer:
I think the answer is X
Explanation:
X is a variable and variables stand for the unknown
Balance the following equation and
then provide the coefficients for each
molecule.
_SnO2+ _H2 --> _Sn + _H20
Answers
Answer:
jbisibjas bhijjoijnc
Explanation:
When 14 cal of heat are added to 12g of a liquid its temperature rises from 10.4 C to 12.7 C. What is the specific heat of the liquid
Answers
Answer:
0.51 cal/g.°C
Explanation:
Step 1: Given data
Added energy in the form of heat (Q): 14 calMass of the liquid (m): 12 gInitial temperature: 10.4 °CFinal temperature: 12.7 °CStep 2: Calculate the temperature change
ΔT = 12.7 °C - 10.4 °C = 2.3 °C
Step 3: Calculate the specific heat of the liquid (c)
We will use the following expression.
c = Q / m × ΔT
c = 14 cal / 12 g × 2.3 °C = 0.51 cal/g.°C
What is the molarity of a solution made by dissolving 1.25 mol of HCl in enough
water to make 625 mL of solution?
A) 0.073 M
B) 2.00 M
OC) 28.5 M
D) 500 M
Answers
Answer:
Explanation:
C
2.00 M is the molarity of a solution made by dissolving 1.25 mol of HCl in enough water to make 625 mL of solution.
What are moles?A mole is defined as 6.02214076 × of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
[tex]Molality = \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]
[tex]Molality = \frac{1.25}{0.625}[/tex]
Molality = 2.00 M
Learn more about moles here:
brainly.com/question/8455949
#SPJ2
Hydrofluoric acid and Water react to form fluoride anion and hydronium cation, like this HF(aq) + H_2O(l) rightarrow F(aq) + H_3O^+ (aq) At a certain temperature, a chemist finds that a 5.6 L reaction vessel containing an aqueous solution of hydrofluoric acid, water, fluoride anion, and hydronium cation at equilibrium has the following composition: Calculate the value of the equilibrium constant K_C for this reaction. Round your answer to 2 significant digits. K_C =
Answers
Answer:
Kc = 1.09x10⁻⁴
Explanation:
HF = 1.62g
H₂O = 516g
F⁻ = 0.163g
H₃O⁺ = 0.110g
To solve this question we need to find the moles of each reactant in order to solve the molar concentration of each reactan and replacing in the Kc expression. For the reaction, the Kc is:
Kc = [H₃O⁺] [F⁻] / [HF]
Because Kc is defined as the ratio between concentrations of products over reactants powered to its reaction coefficient. Pure liquids as water are not taken into account in Kc expression:
[H₃O⁺] = 0.110g * (1mol /19.01g) = 0.00579moles / 5.6L = 1.03x10⁻³M
[F⁻] = 0.163g * (1mol /19.0g) = 0.00858moles / 5.6L = 1.53x10⁻³M
[HF] = 1.62g * (1mol /20g) = 0.081moles / 5.6L = 0.0145M
Kc = [1.03x10⁻³M] [1.53x10⁻³M] / [0.0145M]
Kc = 1.09x10⁻⁴After mixing for three hours, the product is extracted into dichloromethane and the solvent is removed to give 245 mg of an oil. Using the moles of our protected aldehyde calculated earlier (2.96) and the molecular weight of the product (102 g/mol) predict the theoretical 100% yield of the product in milligrams. Round to the tenths place.
Answers
Answer:
the theoretical 100% yield of the product in milligrams is 302920 mg
Explanation:
Given the data in the question;
245 mg of an oil
Using the moles of our protected aldehyde calculated earlier (2.96)
the molecular weight of the product (102 g/mol) = 102000 mg/mol
so, the mass of aldehyde produced (100% yield) will be;
⇒ number of moles × molar mass
⇒ 2.96 mol × 102000 mg/mol
⇒ 302920 mol.mg / mol
⇒ 302920 mg
Therefore, the theoretical 100% yield of the product in milligrams is 302920 mg
You pump 100 gas particles in Basketball A and 100 gas particles in Basketball B. both basketballs are at room temperature ¿Which basketball will be more firm? ¿And Why?
Answers
Answer:
I think the answer is probably b
Which part of the kite catches the wind?
a Cover
b Frame
c Tail
d Kite string
Answers
Answer:
cover A
Explanation:
Answer:
cover sorry if im wrong
Explanation:
the cover makes the kiete float using air resisance
Which of the following is a characteristic of a scientific theory? A.it explains how nature works. B.it is based on a single experiment. C.it should not be possible to replicate it's results. D.it should not be possible to replicate it's observations.
Answers
Answer:
A. It explains how nature works.
Explanation:
A scientific theory is an explanation, based on a body of evidence, of how something works or will behave.
The other three answers contradict scientific theory. Theories should be based on many experiments, and you should be able to replicate the results and observations.
what is the purpose of ash to soil conditioning.
Answers
Answer:
Question: what is the purpose of ash to soil conditioning?
answer: soil conditioner is a product that is added to soil to improve the soils physical qualities, it's usually the fertility of the soil and sometimes the mechanics of the soil. can be used to improve poor soils.
most wood ash contains a good percentage, about 25 percent, of calcium carbonate, which is an ingredient in garden lime. if your soil is highly acidic, with a pH of 5.5 or lower, amending with wood ash can raise the pH of your soil.
State the coefficient required to correctly balance the following chemical equation:
____KCl + ____Fe -----> ____FeCl2 + ____K
Answers
Answer:
2kcl+ fe= Fecl2+2K
so coefficient required be 2 for kcl and 2 forK
Rock is driven underground and changed by heat and pressure. This describes
what?
a. Igneous changing to sedimentary
b. Metamorphic changing to sedimentary
C. Sedimentary changing to metamorphic
d. Sedimentary changing to igneous
Answers
Answer:
Explanation:
metamorphic
g The alkali metals are able to displace hydrogen readily from water. The alkaline earth metals are able to do so as well, although not nearly as vigorously. They are easily able to displace hydrogen from acid. a: Write and balance the equation for any of the alkali metals (pick your favorite!) reacting with water to form hydrogen gas and the metal's hydroxide (e.g. sodium hydroxide, potassium hydroxide). (10 points) b: Write and balance the equation for any of the alkaline earth metals (the second column on the left) reacting with hydrochloric acid to form hydrogen gas and the metal's chloride salt (e.g. magnesium chloride, calcium chloride) (10 points)
Answers
Answer:
See explanation
Explanation:
In writing a chemical reaction equation, we must ensure that it is balanced. In a balanced chemical reaction equation, the number of atoms of each element on the left hand side of the reaction equation must be equal to the number of atoms of the same atom on the right hand side of the reaction equation.
Let us now consider the reaction of NaOH with water as follows;
2Na(s) + 2H2O(l) ------> 2NaOH(aq) + H2(g)
For the reaction of Magnesium metal and HCl we have;
Mg(s) + 2HCl(aq) -------> MgCl2(aq) + H2(g)
Consider an ideal gas enclosed in a 1.00 L container at an internal pressure of 18.0 atm. If the gas expands against a constant external pressure of 1.00 atm to a final volume of 10.0 L, what is the work done?
Now calculate the work done if this process is carried out in two steps.
1. First, let the gas expand against a constant external pressure of 5.00 atm to a volume of 2.00 L.
2. From there, let the gas expand to 10.0 L against a constant external pressure of 1.00 atm.
Answers
Answer:
A=-0.9117kJ.
B= -0.5065kJ
C=-0.8104KJ
Explanation: A s gas expands, it produces works . Therefore
Work done by gas expansion,
W = P Δ V
where P =external pressure,
ΔV = change in volume (final - Initial)
W = -1 atm (10 - 1 ) L
W = -9L. atm x 101.3J/ 1L. atm
W = 911.7Joules ≈ -0.9117kJ.
1.The work done in the first step is:
W= - 5.00 atm × (2.00 L - 1.00 L) = -5 atm·L ×(101.3J / 1 atm·L)
=506.5J = -0.5065kJ
2.The work done in the second step is:
w = - 1.00 atm × (10.0 L - 2.00 L) = -8atm·L ×(101.3J / 1 atm·L
=810.4J
w=-0.8104KJ
The work done in the whole process is:
w =-0.5065kJ --0.8104KJ = -1.3169KJ
Whoever gets these 2 right gets brainliest! :)
Answers
the first one is A covalent bond.
the second one is Answer: B Decomposition