Answer: D. Scientists can come to different conclusions based on the same data.
Express in scientific notation. Choose the answer with the proper number of significant figures: 1.24 x 10^6/6.2 x 10^-3
Answer:
1.24×10^6/6.2×10^-3
200
acc to scientific notation: 0.2×10^3 is the answer
Explanation:
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The diagram represents the general equation for photosynthesis.
What does the X represent?
hydrogen
oxygen
glucose
carbon dioxide
Answer:
The diagram represents the general equation for photosynthesis.
What does the X represent?
Explanation:
Carbon dioxide
pls solve
question attached as image
Answer:
a) formula for citric acid is - C6 H8 o7
b) lime water turns opaque after adding co2 due to the formation of calcium carbonate.
c) reaction 3 is displacement reaction where a high reactive metal displace a less reactive from its salt solution.
d) reaction 1) is combination reaction where two reactant combines to give a single product whereas reaction 2) is decomposition reaction where a single reactant splits into more that 1 products.
A 20.0-ml sample of glucose Iv solution has a mass of 20.6g.what is the density of the glucose
Taking into account the definition of density, the density of the glucose is 1.03 [tex]\frac{g}{mL}[/tex].
What is densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density of the glucoseIn this case, you know that:
Density= ?Mass= 20.6 gVolume= 20 mLReplacing in the definition of density:
[tex]density=\frac{20.6 g}{20 mL}[/tex]
Solving:
density= 1.03 [tex]\frac{g}{mL}[/tex]
In summary, the density of the glucose is 1.03 [tex]\frac{g}{mL}[/tex].
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What is the name of CH3CH2CHMgBr(CH3)?
Answer:
Ethyl magnesium Bromide
How much sodium bicarbonate to raise alkalinity in pool.
Answer:
A rule of thumb is that 1.5 lbs. of baking soda per 10,000 gallons of water will raise alkalinity by about 10 ppm. If your pool's pH is tested below 7.2, add 3-4 pounds of baking soda. If you're new to adding pool chemicals, start by adding only one-half or three-fourths of the recommended amount.
Atom is a smallest particle of an element which have all the chemical properties of that element.What is the origin of Atom.
Answer:
ORIGIN OF ATOM.Sometimes peoples like to say that atom is like a cell in living things,is it true?comment below,letss goo!!
Explanation:
A greek philosopher known as Democritus was the first to consider the idea that matter is made up of small particles ,about 400BC.
Since there was no experimental evidence to support his idea,it was not accepted.
About 2000 years later an English man called John Dalton revived the discussion.He used experimental evidence to support his idea to convince people that matter is made up of particles called atoms.It accepted!.
An English man called John Dalton revived the discussion.He used experimental evidence to support his idea to convince people that matter is made up of particles called atoms.It was accepted ,he conclude the following theories:
Matter is made up of tiny particles called atom which cannot be splitted into simpler substancesAtom cannot be created nor destroyedSuppose that you add 26.7 g of an unknown molecular compound to 0.250 kg of benzene, which has a K f Kf of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 3.89 oC compared to pure benzene. What is the molar mass (in g/mol) of the unknown compound
From the calculation, the molar mass of the solution is 141 g/mol.
What is the molar mass?We know that;
ΔT = K m i
K = the freezing constant
m = molality of the solution
i = the Van't Hoft factor
The molality of the solution is obtained from;
m = ΔT/K i
m = 3.89/5.12 * 1
m = 0.76 m
Now;
0.76 = 26.7 /MM/0.250
0.76 = 26.7 /0.250MM
0.76 * 0.250MM = 26.7
MM= 26.7/0.76 * 0.250
MM = 141 g/mol
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calculate the number of moles in positive and negative ions in 1.75 moles of calcium fluoride quizlet
CaF₂ ⇒ Ca²⁺ + 2F⁻
1.75 1.75 3.5
When some water condensed
onto a glass, it released 9.15 Cal
of energy. How many joules of
energy is this?
[?] joules
When we convert 9.15 Calories to joules, the result obtained is 38.28 Joules
How do i convert 9.15 calories to joules?From the question given above, the following data were obtained:
Energy (in Calories) = 9.15 caloriesEnergy (in Joules) =?The conversion scale to convert calories to joules is given below:
1 Calorie = 4.184 Joules
Using the above scale, we can convert 9.15 calories to joules as shown below:
1 Calorie = 4.184 Joules
Therefore,
9.15 Calories = (9.15 Calorie × 4.184 Joules) / 1 Calorie
9.15 Calories = 38.28 Joules
Thus, we can conclude from the above calculation that the energy in joules is 38.28 Joules
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Answer:
38,200J
Explanation:
9.15 x 4.18 x 1000= 38,247 → 38,200J
Ammonia, NH3(g), can be used as a substitute for fossil fuels in some internal combustion
engines. The reaction between ammonia and oxygen in an engine is represented by
the unbalanced equation below.
NH3(g) + O₂(g) →→ N₂(g) + H₂O(g) + energy
6. Balance the equation in the space below for the reaction of ammonia and oxygen, using the
smallest whole-number coefficients.
Answer:
4 NH₃ (g) + 3 O₂ (g) ----> 2 N₂ (g) + 6 H₂O (g) + energy
Explanation:
The unbalanced equation:
NH₃ (g) + O₂ (g) ----> N₂ (g) + H₂O (g) + energy
Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen
Products: 2 nitrogen, 2 hydrogen, 1 oxygen
The sort-of balanced equation
2 NH₃ (g) + 1/2 O₂ (g) ----> N₂ (g) + 3 H₂O (g) + energy
I first started by balancing the nitrogens. This then lead me to balance the hydrogens. When I went to balance the oxygens, only a 1/2 coefficient would work. However, 1/2 coefficients are technically incorrect. To get rid of this coefficient, you need to multiply each coefficient by 2.
The balanced equation:
4 NH₃ (g) + 3 O₂ (g) ----> 2 N₂ (g) + 6 H₂O (g) + energy
Reactants: 4 nitrogen, 12 hydrogen, 6 oxygen
Products: 4 nitrogen, 12 hydrogen, 6 oxygen
Now, all of the elements are equal on both sides and there are no 1/2 coefficients. These are the smallest whole-number coefficients because some of the numbers cannot be further simplified (3).
Please help!
Three sections of the periodic table are labeled A, B, and C in the image below.
Which of the following statements is most likely true for an element present in section A?
It is dull and brittle.
It is malleable and ductile.
It is a liquid at room temperature.
It is a poor conductor of electricity.
Answer:
they are metals so they are:-
-malleable
-ductile
because metallic bonding is the same in all direction throughout the solid
An exergonic reaction __________ free energy, and an endergonic reaction __________ free energy.
entir
What is the striking back of
the
bunsen-
burner?
Answer:
With too little air, the gas mixture will not burn completely and will form tiny carbon particles that are heated to glowing, making the flame luminous. With too much air, the flame may burn inside the burner tube; that is, it may strike back.
What mass of reactants are used
during the reaction?
Iron + Sulfur➜ Iron Sulfide
27.50 g
? g
Give your answer to the correct number of
significant figures.
(g) Iron + Sulfur
Answer:
27.50 g
Explanation:
Unless weight was somehow gained/lost during the reaction, the products should weigh as much as the reactants. Since this isn't specified the mass of the reactants should be equal to the mass of the products.
If you keep a gas's temperature constant, how would you increase the volume of the gas?
a. You would change the temperature
b. You would increase the pressure
c. You would decrease the temperature
d. You would decrease the pressure
Answer: d. You would decrease the pressure
Explanation:
If the temperature of a gas is held constant, the pressure and volume vary inversely.
If the gas's temperature remains constant, then increase the volume of the gas with a decrease in the pressure. Therefore, option (D) is correct.
What is Boyle's law?Boyle’s law can be described as at a constant temperature, the pressure exerted by a given mass of gas being inversely proportional to the volume occupied by the gas.
The pressure and volume of a gas at a particular temperature have an inverse relationship.
P ∝ 1/V
or P₁ .V₁ = P₂. V₂ ................ (1)
Where the initial and final pressure of the gas is P₁ and P₂ respectively. The initial and final volume of the gas is V₁ and V₂ respectively at temperature 'T'.
Therefore, if we keep the temperature of the gas constant. them the volume of the gas will increase only if we decrease the pressure of the gas.
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how to minimize the harmful effects of power station on our environment
WILL GIVE BRAINLIEST
The table shows the number of reactants and products present during two separate chemical reaction
Which of the following statements correctly identifies the decomposition reaction and describes a substance involved?
Chemical reaction A, because the reactant is a compound
Chemical reaction B, because the product is a compound
Chemical reaction A, because the reactant is an element
Chemical reaction B, because the product is an element
Answer:
Chemical reaction A, because the reactant is a compound
Explanation:
In a decomposition reaction, a compound is broken down into its components, so the number of products is greater than the number of reactants
Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.
What is chemical reaction?When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.
Although a chemical reaction is not always a "one-way street," as we'll examine further in the next section, an arrow is drawn between the reactants and products to denote the direction of the reaction.
Our equation must have them in it in order for there to be an equal number of atoms of each element on both sides of the equation.
Therefore, Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.
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PLEASE HELP FAST! How many grams of NO are formed if 8.3 g of ammonia react with 11.8 g of oxygen? The reaction is 4NH3 + 5O2 --> 4NO + 6H2O.
Options:
A. 8.85 g NO
B. 12.6 g NO
C. 14.6 g NO
D. 9.3 g NO
The mass of NO produced is 9.3 g; option D.
What mass of NO is produced from the reaction?
The mass of nitrogen (ii) oxide, NO, produced from the reaction is determined from the mole ratio of the reaction.
The mole ratio of ammonia to oxygen from the equation of the reaction is 4 : 5.
moles of oxygen = 11.8/32 = 0.368
moles of ammonia = 8.3/17 = 0.488
Oxygen is the limiting reactant.
Mass of NO produced = 0.369 * 4/5 * 30 = 9.4 g NO
In conclusion, approximately 9.3 g of NO is produced.
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what has the highest volume 1kg lead, 1kg of iron, 1kg of gold, or 1kg of copper
Answer:
1kg gold because when it's mined it needs stronger machines
1kg gold because when it's mined it needs stronger machines.
What is volume?The amount of space occupied by a three-dimensional figure as measured in cubic units.
Gold is called a heavy metal because of its high density, which comes from the fact that each of its atoms is individually very heavy.
Hence, 1kg gold because when it's mined it needs stronger machines.
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If you know the velocity at which an object is moving, which two things do you know about the object's motion?
O speed and direction
O
distance and speed
time and distance
O direction and time
Answer:
speed and direction are the two things
An ice cube absorbs 353 cal of
energy from its surroundings.
How many joules of energy is
this?
Answer:
1482.6 J
Explanation:
353 cal * 4.2 J / 1 cal = 1482.6 J
An ice cube absorbs 353 cal of energy from its surroundings. Number of joules of energy is 1482.6 Joules.
What is Energy?The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.
Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.
Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.
1 calorie of energy has 4.2 Joules.
Given, 353 Calories of Energy
Hence, 353 Calories of Energy has 1482.6 Joules.
Therefore, An ice cube absorbs 353 cal of energy from its surroundings. Number of joules of energy is 1482.6 Joules.
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What is the molar concentration of
a solution that contains
5.0 mol HCl in a total volume
of 10.0 L?
Answer:
0.5 M
Explanation:
Molar concentration : M = n/v
n = moles of solute
v = liters of solution
Hence, 5.0 / 10.0 = 0.5 M
5.00g of an unknown metal we know has a +2 charge (M^+2) is reacted with an excess of hydrochloric acid (HCl(aq)). The product is dried and weighs 11.35 grams. What is the formula and name of the product formed?
the formula: MCl₂
name of the product formed: chloride salt + hydrogen
How many atoms from the following molecule will be detected in a 13c nmr experiment? we are not asking for unique signals, just total number of atoms
The structure of the compound, there will be ten unique signals in the carbon 13 NMR of the compound.
What are NMR signals?The NMR signals shows the atoms in a compound that are in unique chemical environments. The atoms that are in the same chemical environment will only give one signal.
Based on the structure of the compound, there will be ten unique signals in the carbon 13 NMR of the compound.
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A student was given a mixture of iron of iron fillings and sulphur. He was told to heat it and observe the compound.
(a) What is coloured formed.
(b) Write the effect of magnet on it.
(c) Write the action of carbon disulphide on it.
(d) Describe the effect of adding dilute hydrochloric acid to it. ldentify the gas and write its two properties.
The observations are as follows:
black iron sulfide is formed iron sulfide is not magnetic No reaction observed with carbon sulfidehydrogen gas is evolved What is the product of the reaction of iron fillings and sulfur when heated?When a mixture of iron fillings and sulfur are heated, black iron (ii) sulfide is formed.
Unlike iron fillings, black iron (ii) sulfide is not attracted to a magnet.
When carbon sulfide is added to it, no visible reaction is observed.
When dilute hydrochloric acid is added to it, a gas with a rotten-egg smell is evolved.
The gas is hydrogen sulfide which is a reducing agents and acidic in nature.
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2Na+S→Na2S
What is the total number of moles of S that react when 4.0 moles of Na were completely consumed?
Answer:
2.0 moles S
Explanation:
To find the number of moles of S, you need to convert the moles Na to moles S via the mole-to-mole ratio. This ratio is represented by the coefficients in the balanced equation. Because you wish to find moles S, you want to put this number in the numerator. Because you want to eliminate the moles Na, this number should be in the denominator.
2 Na + 1 S ---> Na₂S
4.0 moles Na 1 mole S
---------------------- x --------------------- = 2.0 moles S
2 moles Na
Convert from moles to particles 6.02x1023 particles 1 mole Question 2. 2.7 moles of lithium Question 3. 1.8 moles of sodium chloride
Considering the definition of Avogadro's number:
the number of molecules of lithium is 1.62621×10²⁴ molecules.the number of molecules of sodium chloride is 1.08414×10²⁴ molecules.Definition of Avogadro's numberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of molecules in this caseYou can apply the following rule of three, considering the Avogadro's number: If 1 mole of lithium contains 6.023×10²³ molecules, 2.7 moles of lithium contains how many molecules?
amount of molecules of lithium= (6.023×10²³ molecules × 2.7 moles)÷1 mole
amount of molecules of lithium=1.62621×10²⁴ molecules
Finally, the number of molecules of lithium is 1.62621×10²⁴ molecules.
On the other hand you can apply the following rule of three, considering the Avogadro's number: If 1 mole of sodium chloride contains 6.023×10²³ molecules, 1.8 moles of sodium chloride contains how many molecules?
amount of molecules of sodium chloride= (6.023×10²³ molecules × 1.8 moles)÷1 mole
amount of molecules of sodium chloride=1.08414 ×10²⁴ molecules
Finally, the number of molecules of sodium chloride is 1.08414×10²⁴ molecules.
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The main environmental factors that affect microorganism growth include chemical inhibitors, oxygen, pH, nutrients, moisture and...
The main environmental factors that affect microorganism growth include chemical inhibitors, oxygen, pH, nutrients, moisture and temperature.
What are micro organism?Micro Organism are organism that can be seen with a microscope.
Microorganisms include bacteria, protozoa, algae, and fungi.
Micro organisms exist in its single-celled form or as a colony of cells.
The main environmental factors that affect microorganism growth include chemical inhibitors, oxygen, pH, nutrients, moisture and temperature.
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10.5 mL of an unknown solution are diluted to 80.0 mL. The concentration of the
new solution was determined to be 0.172 M. What was the molarity of the
unknown solution? (Report your answer to two places past the decimal point.
Moodle is looking for a number only, no units.)
Taking into account the definition of dilution, the molarity of the unknown solution is 0.133 M.
DilutionDilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeInitial concentrationIn this case, you know:
Ci= ?Vi= 10.5 mLCf= 0.172 MVf= 80 mLReplacing in the definition of dilution:
Ci× 10.5 mL= 0.172 M× 80 mL
Solving:
Ci= (0.172 M× 80 mL)÷ 10.5 M
Ci= 0.133 M
In summary, the molarity of the unknown solution is 0.133 M.
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