Answer:by repeating trials during an experiment.
Explanation:
.
Answer:
its b
Explanation:
How many moles of H+ ions are needed to neutralized 3 Liters of 8M
NaOH?*
Answer:
Answer:
0.027 mole of NaOH.
Explanation:
We'll begin by obtaining the number of mole H2SeO4 in 45mL of 0.30M H2SeO4
This is illustrated below:
Molarity of H2SeO4 = 0.3M
Volume of solution = 45mL = 45/1000 = 0.045L
Mole of H2SeO4 =...?
Mole = Molarity x Volume
Mole of H2SeO4 = 0.3 x 0.045
Mole of H2SeO4 = 0.0135 mole
Next, the balanced equation for the reaction. This is given below:
H2SeO4 + 2NaOH –> Na2SeO4 + 2H2O
From the balanced equation above,
1 mole of H2SeO4 required 2 moles of NaOH.
Therefore, 0.0135 mole of H2SeO4 will require = 0.0135 x 2 = 0.027 mole of NaOH.
Therefore, 0.027 mole of NaOH is needed for the reaction.
mark me branlest plzz
Explanation:
Answer: 0.027 mole of NaOH.
Explanation:
We'll begin by obtaining the number of mole H2SeO4 in 45mL of 0.30M H2SeO4
This is illustrated below:
Molarity of H2SeO4 = 0.3M
Volume of solution = 45mL = 45/1000 = 0.045L
Mole of H2SeO4 =...?
Mole = Molarity x Volume
Mole of H2SeO4 = 0.3 x 0.045
Mole of H2SeO4 = 0.0135 mole
Next, the balanced equation for the reaction. This is given below:
H2SeO4 + 2NaOH –> Na2SeO4 + 2H2O
From the balanced equation above,
1 mole of H2SeO4 required 2 moles of NaOH.
Therefore, 0.0135 mole of H2SeO4 will require = 0.0135 x 2 = 0.027 mole of NaOH.
Therefore, 0.027 mole of NaOH is needed for the reaction.
Explanation:
what is one thing that would make evidence from an experiment more reliable? A if there was no comparison group B if there was a small sample C if the source of the information was an expert D it is not D i tried D already
Answer:
Explanation:
When a scientist repeats an experiment with a different group of people or a different batch of the same chemicals and gets very similar results then those results are said to be reliable. Reliability is measured by a percentage – if you get exactly the same results every time then they are 100% reliable.
In peas, having wrinkled pods (W) is dominant to having smooth pods (w). A heterozygous pea plant is crossed with a pea plant that has smooth pods. Create a punnett square (you do not have to include the actual square in your answer). What are the genotypes and phenotypes of the offspring (include numbers).
Answer:
Genotype: Ww, Ww, ww, ww
Phenotype: heterzygous wrinkled pods, heterzygous wrinkled pods, homozygous smooth pods, homozygous smooth pods
Explanation:
You have to cross Ww with ww and you will get the genotypes and phenotypes above.
Why cant we just put in subscripts?
Answer:
A subscript is a character, usually a letter or number, that's printed slightly below and to the side of another character. Subscripts are commonly used in chemical formulas. ... It's closely related to superscript, when a letter or number is printed above another character.
How can local environmental changes have global effects?
a. Organisms can move from one environment to another.
b. Air and water move from region to region.
C. Increased carbon dioxide in one location can cause increased temperatures in other locations
d. All of the above are true.
Please select the best answer from the choices provided
OA
B
O O O O
Answer:
D got it right on edge 2020
Explanation:
Which of the following describes an object in static equilibrium?
A. A gorilla jumps straight into the air.
B.Asquid moves at a velocity of 10 m/s straight down.
C.A car drives in a circle at a constant speed of 8 m/s .
D.An elephant stands in one place without moving .
Answer:
D
Explanation:
An elephant standing in one place without moving is in static equilibrium. Therefore, option D is correct.
What is static equilibrium?Static equilibrium can be described as the sum of the exerting torques and forces on each part of the body that happens to be null.
In the static equilibrium of a body whose parts are in a state of rest. The essential condition for this type of equilibrium is that a body is not showing any form of movement.
In translational equilibrium, a body is not moving from one point to another while in rotational equilibrium is not spinning around a point. Translational equilibrium requires the sum of every outside force to be zero. Torque can be defined as a quantity that exerts the rotational movement of an object.
If two forces are acting on a body that is in the state of static equilibrium, where the total sum of forces is zero. Therefore, for the elephant standing in one place without moving there are only two forces i.e. the weight of the elephant and the normal force to balance it. Therefore, it describes in static equilibrium.
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Which best describes what happens when a neutral atom becomes a positive
ion?
O
A. The remaining electrons spread farther out.
O
B. The excess protons pull harder on the fewer electrons
O
C. The remaining electrons are more easily lost.
O
D. The excess protons push the remaining electrons away
Answer: the answer is b
Explanation:
A spoonful of salt is stirred into a pot of water.The salt is a
Answer:
the salt is a solute in this instance
Photosynthesis occurs in the ____________and cellular respiration occurs in the ___________.
Group of answer choices
Explanation:
Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria
Answer:
Chloroplast, mitochondria
Explanation:
Photosynthesis is a process that plants, algae, and some bacteria use to make their own food. They take light energy, carbon dioxide and water and produce glucose and oxygen. This process takes place in the chloroplasts.
Animals and plants both use a process called cellular respiration. This process takes glucose and oxygen, and creates ATP, carbon dioxide and water. Animals and plants use ATP to move, grow, and carry out cellular functions. This process takes place in the mitochondria.
4. What is the specific heat of iron, if it requires 1050 J of heat energy to raise the temperature of
220,0 g of iron from 10.0.C to 20.4.C?
Answer:
0.4589J/g°C
Explanation:
Heat energy = 1050J
Mass of iron = 220.0g
Initial temperature (T1) = 10°C
Final temperature (T2) = 20.4°C
Heat energy = mc∇T
Q = mc∇T
Q = heat energy
M = mass of the substance
C = specific heat capacity of the substance
∇T = change in temperature = T2 - T1
Q = m×c×(T2 - T1)
1050 = 220 × c ×(20.4 - 10)
1050 = 220c × (10.4)
1050 = 2288c
c = 1050 / 2288
C = 0.4589J/g°C
The specific heat capacity of iron is 0.4589J/g°C
Answer:
0.4589 J g^-1 K^-1 IS THE SPECIFIC HEAT OF IRON.
Explanation:
Specific heat of iron can be calculated using the heat of reaction formulae
Heat = mass * specific heat * ( T2-T1)
H = m c (T2-T1)
c = H / m * (T2-T1)
H = 1050 J
m = 220.0 g
T2 = 20.4 ° C = 20.4 + 273 = 293.4 K
T1 = 10.0 °C = 10 + 273 K = 283 K
so therefore:
c = 1050 / 220 * ( 293.4 - 283) K
c = 1050 / 220 * 10.4
c = 1050 / 2288
c = 0.4589 J g^-1 K^-1
The specific heat capacity of iron is 0.4589 J g^-1 K^-1
HELP I NEED TO EXPLAIN THE ANSWERS!!!
Propane burns in excess oxygen according to the following reaction.
C3H8 + 5O2 → 3CO2 + 4H2O
a.H ow many moles each of CO2 and H2O are formed from 3.85 mol of propane?
ans: 11.6 mol CO2, 15.4 mol H2O
b. If 0.647 mol of oxygen is used in the burning of propane, how many moles each of CO2 and H2O are produced? How many moles of C3H8 are consumed?
ans: 0.388 mol CO2, 0.518 mol H2O, 0.129 mol C3H8
Explanation:
A. Solve the answer using stoichiometry. This means that you have to look at the coefficients of the equation to solve this.
The problem gave the moles of propane used to form product. Your job is to find the moles of product formed. Use the equation to solve this. The coefficients represent moles.
Propane has no coefficient implying that the number in front of propane would be 1. CO₂ has a coefficient of 3, and H₂O has a coefficient of 4. This means that for every mole of propane, 3 moles of CO₂ and 4 moles of H₂O are formed.
Multiply the moles of propane by the coefficients of the products.
3.85 × 3 = 11.55 mol CO₂
3.85 × 4 = 15.4 mol H₂O
You have solved for moles of each product.
B. This problem has about the same concept as the one before. Look at the equation. For every 5 moles of O₂, 3 moles of CO₂ and 4 moles of H₂O are formed. For every 5 moles of O₂, 1 mole of propane is needed.
This time, however, you cannot simply multiply the amount of moles by the coefficient. This is because you need 5 moles, not 1, to get that many moles produced.
This time, multiply the moles by the coefficients over the original coefficient.
0.647 × 3/5 = 0.388 mol CO₂
0.647 × 4/5 = 0.518 mol H₂O
0.647 × 1/5 = 0.129 mol C₃H₈
Moles of CO₂ and H₂O are produced by the 3.85 mol of propane is 11.55 and 15.4 moles respectively.
What is stoichiometry?Stoichiometry of the reaction tells about the amount of species present before and after the completion of reaction.
Given chemical reaction is :
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
From the stoichiometry of the reaction it is clear that:
1 mole of C₃H₈ = produces 3 moles of CO₂
1 mole of C₃H₈ = produces 4 moles of H₂O
1 mole of C₃H₈ = reacts with 5 moles of O₂
5 moles of O₂ = produces 3 moles of CO₂
5 moles of O₂ = produces 4 moles of H₂O
5 moles of O₂ = reacts with 1 mole of C₃H₈
3.85 moles of C₃H₈ = produces 3×3.85=11.55 moles of CO₂3.85 moles of C₃H₈ = produces 4×3.85=15.4 moles of H₂O0.647 moles of O₂ = reacts with 1/5×0.647=0.129 moles of C₃H₈0.647 moles of O₂ = produces 3/5×0.647=0.388 moles of CO₂0.647 moles of O₂ = produces 4/5×0.647=0.517 moles of H₂OHence required moles are calculated above.
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Given the balanced equation representing a reaction:
Fe2O3 + 2Al Al2O3 + 2Fe
During this reaction, the oxidation number of Al changes from
A) +3 to 0 as electrons are transferred
B) +3 to 0 as protons are transferred
C) 0 to +3 as electrons are transferred
D) 0 to +3 as protons are transferred
Answer:
C) 0 to +3 as electrons are transferred
Explanation:
[tex]Fe_{2}O_{3} + 2Al^{0} --> Al^{+3}_{2}O_{3} + 2Fe\\\\Al^{0} -3e^{-}--> Al^{+3}[/tex]
The formula for sulfuric acid is H2SO4. A mole of sulfuric acid would have a mass of ___ grams.
Answer:
98.0795 g
Explanation:
The molar mass of sulfuric acid is 98.0795 g/mol . This means that every mole of sulfuric acid has a mass of 98.0795 g.
Why is salt added to hot chicken soups during cooking besides giving the chicken soups a good taste?
The freezing point of water decreases as salt dissolves.
The freezing point of water increases as salt dissolves.
The boiling point of water increases as salt dissolves.
The boiling point of water decreases as salt dissolves.
Answer:
The answer is option 3.
Explanation:
When salt is added to the water, the boiling point increases because it needs to take in more energy from heat to break down the bonds and dissolve the salt in the water.
(Correct me if I am wrong)
Which changes occur when Pt2+ is reduced? A) The Pt2+ gains electrons and its oxidation number increases. B) The Pt2+ gains electrons and its oxidation number decreases. C) The Pt2+ loses electrons and its oxidation number increases. D) The Pt2+ loses electrons and its oxidation number decreases.
Answer:
C
Explanation:
TIMED PLEASE HELP! Which is shown by the letter X?
trough
amplitude
crest
wavelength
Answer: crest
Explanation:
X is pointing to the peak of the wave. Hence, the answer is the third option: crest.
Answer:
The answer is crest
Explanation:
The highest surface part of a wave is called the crest
15.) Solar energy, wind, and geothermal are what type of energy resource?
a.) Inexhaustible
b.) Inexpensive
c.) Nonrenewable
d.) Chemical
Answer:
a,) inexhaustible energy resources
Big question for physicists out there:How can we be sure dark matter actually exists in our universe?
Answer:
We can see the bright matter, like stars, but we know some other matter is there(dark matter)because of how it pulls on the bright matter.
Explanation:
In hamsters, being Brown (B) is dominant to being tan (b). Two Brown hamsters produce 3 brown offspring and 1 tan offspring. What MUST be the GENOTYPES of the parents?
Answer:
Bb and Bb
Explanation:
This will give you the desired results of one homogeneous BB (brown), two heterogeneous Bb (brown), and one homogeneous bb (tan).
What is the same about the moon’s rotation and revolution around Earth?
Answer:
The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis. ... When the moon is between the Earth and the sun, during the new moon phase, the back side of the moon is bathed in daylight.
Explanation: endg 2020 ;]
1 point
A chemical cell differs from an electrolytic cell because in a chemical cell
there is
A) a positive and negative electrode
B) an anode and a cathode
C) a redox reaction that produces an electric current
D) an electric current that causes a redox reaction
Nahi which
Answer: C) a redox reaction that produces an electric current
Explanation:
Chemical cell is a device which is used for the conversion of the chemical energy produced in a redox reaction into the electrical energy. The cell consists of the negative terminal called as anode where oxidation takes place and a positive terminal called as cathode where reduction takes place.
Electrolytic cell is a device which is used to carry out chemical reactions by the use of electrical energy. The cell consists of the negative terminal called as cathode where reduction takes place and a positive terminal called as anode where oxidation takes place.
PLZ HURRY
7. What is the measurement 1042 L rounded off to two significant digits?
A 1.0 × 103 L
B 1050 L
C 1040 L
D 1.1 x 103 L
The value 1042 L rounded to 2 significant digits is 1000 = 1.0 × 10³ L
To round to 2 significant digits :
Write out the first two digits from the left : 10The next digit after the second is rounded to 1 and added to the 2nd digit if it is greater than or equal to 5 else it is rounded to 0 Since, the third digit is 4 ; we round to to 0 ; including the other succeeding digits ; Hence, we have 10001000 could be written in scientific notation as :
1000 = 10 × 10 × 10 = 1 × 10³Therefore, 1042 = 1 × 10³ (2 significant digits)
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Identify what type of reaction is below. Also determine what coefficients that would balance the chemical equation. ___ HCl + ___Zn → ___ H2 + ___ZnCl2 A) Double Replacement; 2, 1, 1, 1 B) Single Replacement; 2, 1, 1, 1 C) Synthesis; 1, 2, 1, 2 D) Double Replacement; 1, 2, 1, 1
Answer:
Single Replacement; 2, 1, 1, 1
Explanation:
2HCl + Zn → H2 + ZnCl2
In a single replacement reaction, one specie is replaced by another specie in a chemical reaction.
If we look at the reaction above, zinc metal reacted with hydrochloric acid. The reaction proceeds in such a manner that zinc replaces hydrogen in hydrochloric acid. This is a single replacement reaction because only one chemical specie is displaced in the reaction.
What do isotopes of an element contain?
Answer:
Explanation:
An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element. The nuclei of most atom s contain neutrons as well as protons
What is the solution to the problem expressed to the correct number of significant figures?
12.0/7.11 = ?
A. 1.688
B. 1.69
C. 1.7
D. 1.70
Answer:
B
Explanation:
Answer:
B. 1.69
Explanation:
Someone help
Please
Answer:
what is the topic
Explanation:
The impacts of global warming are being felt and will be felt increasingly in your lifetime. What impacts are likely to be seen in the next few decades
Answer:
Hotter climate, more greenhouse gases, and less water
I hope this helps :)
Explanation:
Describe the celestial object in the image. The object is called a because it is producing and has not yet .
The image, blanks and options are missing in the question. So the image is attached below and the complete question is:
Describe the celestial object in the image.
The object is called________ a because it is producing _______ and has not yet ________ .
First Blank: A.Meteor B.Meteorite C.Meteoroid
Second Blank: A. a streak of light B. An orange Horizon C. A star- Filled sky
Third Blank: A. Reached earths atmosphere B. Struck Earth C. Completed an orbit
Answer:
First Blank - A. Meteor
Second Blank - A. a streak of light
Third Blank - A. Reached earths atmosphere
Explanation:
The given image shows celestial object called meteor.
The meteor is often called shooting star as it produces a streak of light. When a meteoroid reaches Earth's atmosphere, it experiences a friction which allows the meteoroid to burn up and produce a streak of light in the sky.
Hence, the correct answer for blanks is Meteor, a streak of light and Reached earths atmosphere.
If someone stops taking a highly addictive drug abruptly and
begins to experience pain and depression, they are likely going
through:
WITHDRAWAL
TOLERANCE
OVERDOSE
DEPENDENCE
Answer:OVERDOSE
Explanation: Because when take a addictive drug you mostliky took too much and u cant stop.
Answer:
OVERDOSE
Explanation:
and this is not for question but on Netflix put the code 7424 in the search bar to get all of the anime on Netflix
Imagine you see a famous person.
Which best explains the process of how your nervous system “senses” the person, then instructs you to ask for an autograph?
A eyes-spinal cord-mouth
B brain-eyes-mouth
C eyes-spinal cord-brain-spinal cord-mouth
D eyes-brain-mouth