Answer:
density = mass / volume
mass of iron = 9.3g
volume of iron = 29.78ml - 28.00ml = 1.78 ml
density of iron = 9.3 / 1.78 = 5.22471910112 = 5.0
Explanation:
What type of heat transfer occurs when you touch a metal seat with your
hand and the seat feels cold?
A. Radiation
B. Convection
C. Conduction
D. Transportation
2 3 5 6 7 Which best describes the reactants and products of photosynthesis? Reactants are formed inside the plant, and products are taken in from the environment by the plant. Reactants are taken in from the environment by the plant, and products are formed inside the plant. Reactants and products are formed inside the plant. Reactants and products are taken in from lite environment by the plant.
Answer:
reactants are taken in from the environment by the plant,and products are formed inside the plant.
Explanation:
Which of the following is a characteristic science?
Answer:
what are the answer choices?
Explanation:
Answer:
The Answer is A
Explanation:
It asks questions about the natural world.
Hope this helps!!
which is the formula of nitrogen (I) oxide?
Answer:
Oxides of nitrogen are a mixture of gases that are composed of nitrogen and oxygen. Two of the most toxicologically significant compounds are nitric oxide (NO) and nitrogen dioxide (NO2). Other gases belonging to this group are nitrogen monoxide (or nitrous oxide, N2O), and nitrogen pentoxide (NO5).
Explanation:
Each hydrogen atom has one valence electron, but it needs two electrons to be stable. How can both hydrogen atoms each achieve a stable configuration
Answer:Through Covalent Bonding
Explanation:
Both Hydrogen can achieve a stable configuration with 2 electrons by each sharing their electrons.
The name of this bonding is called covalent bonding. In this type of bonding, each participating entity (in this case, the hydrogen atoms) donates their valence electrons (the one valence electron in the hydrogen atoms) then share the total electrons (1 + 1 = 2).
When a strong acid and a strong base react completely, what is the resulting pH? (numerical value only)
Answer:
i think the answer is 7
Explanation:
Hope this is it
In another experiment, a 0.150 M BF4^-(aq) solution is prepared by dissolving NaBF4(s) in distilled water. The BF4^-(aq) ions in the solution slowly react with H2O(l) in the reversible reaction represented below.
BF4-(aq) +H20(l) → BF3OH-(aq) + HF(aq)
[HF] reaches a constant value of 0.0174 M when the reaction reaches equilibrium. For the forward reaction, the rate law is rate = kf [BF4-]. The value of the rate constant kf was experimentally determined to be 9.00x10-4 min-1.
Required:
a. Calculate the rate of the forward reaction after 600 minutes.
b. A student claims that the initial rate of the reverse reaction is equal to zero. Do you agree or disagree with this claim?
Answer:
A) Forward rate = 1.1934 × 10^(-4) M/min
B) I disagree with the claim
Explanation:
A) We are told that [HF] reaches a constant value of 0.0174 M at equilibrium.
The reversible reaction given to us is;
BF4-(aq) +H20(l) → BF3OH-(aq) + HF(aq)
From this, we can see that the stoichiometric ratio is 1:1:1:1
Thus, concentration of [BF4-] is now;
[BF4-] = 0.150 - 0.0174
[BF4-] = 0.1326 M
From the rate law, we are told the forward rate is kf [BF4-].
We are given Kf = 9.00 × 10^(-4) /min
Thus;
Forward rate = 9.00 × 10^(-4) /min × (0.1326M)
Forward rate = 1.1934 × 10^(-4) M/min
(B) The student claims that the initial rate of the reverse reaction is equal to zero can't be true because at equilibrium, rates for the forward and reverse reactions are usually equal.
Thus, I disagree with the claim.
What is the Scientific notation for 0.10050
Answer:
1.005 x [tex]10^{1}[/tex]
Explanation:
A sheet of aluminum foil has a volume of 0.555 cm3. If the foil measures 10.0 cm by 10.0 cm, what is the thickness of the foil?
Answer: B) 0.005 55 cm
Hope you have a blessed day!
A compound with molecular formula C4H8O2, shows absorptions at 2500-3300 cm-1 (broad), 1720 cm-1 and at 1200 cm-1 on the IR spectrum. Propose possible structure(s) for this compound.
Answer:
Butanoic Acid:
I have attached the structure of Butanoic Acid. Please refer to the attachment.
Explanation:
Solution:
First of all, we need to calculate the double bond equivalent (DBE) for the compound given:
Compound = C4H8O2
DBE = (C +1) - (H + X - N)/2
C = no. of carbons
H = no. of Hydrogen
X = no. of Halogens
N = no. of Nitrogen
DBE = (4+1) - (8/2)
DBE = 5-4
DBE = 1
It indicates the presence of 1 double bond in the possible structure.
Further structure can be identified by looking the peak values of the spectrum. So, we have,
2500 - 3300 = it indicates the presence of -COOH group
1720 = it indicates the (C=0) stretching
1200 = It indicates the (C-O) stretching
SO, the possible structure is
Butanoic Acid:
I have attached the structure of Butanoic Acid. Please refer to the attachment.
A chemist adds of a M calcium sulfate solution to a reaction flask. Calculate the mass in grams of calcium sulfate the chemist has added to the flask
Answer:
1.23 g
Explanation:
A chemist adds 1.55 L of a 0.00582 M calcium sulfate solution to a reaction flask. Calculate the mass in grams of calcium sulfate the chemist has added to the flask.
Step 1: Given data
Volume of the solution (V): 1.55 LMolar concentration of the solution (C): 0.00582 M (0.00582 mol/L)Step 2: Calculate the moles (n) of calcium sulfate added
We will use the following expression.
n = C × V
n = 0.00582 mol/L × 1.55 L
n = 0.00902 mol
Step 3: Calculate the mass corresponding to 0.00902 moles of calcium sulfate
The molar mass of calcium sulfate is 136.14 g/mol.
0.00902 mol × 136.14 g/mol = 1.23 g
Use the information to calculate deltaGrxn at 298 K. 3H2(g) +N2(g) 2NH3(g) deltaHrxn = -92.38 deltaSrxn =-198.2 J/K deltaGrxn = ___kJ
Answer:
-33.3 kj
Explanation:
Answer:
first part = - 2453.1
second part = - 33.3
Explanation:
edg 22
The term “periodic” helps identify _______ that occur in the table, like electronegativity or atomic radii.
A. Atomic mass
B. Families
C. Patterns
If u can answer this thank you so much
Answer: ITS C OR B I THINK BUT I HAVE A FEELING ITS ONE OF THOSE
Explanation:
IM SO SORRY IF ITS WRONG KSDBDZDH
Answer:
C. Patterns
Explanation:
I got it right on usatestprep
Which actions will change an object’s weight, but not it’s mass?
A. Breaking the object
B. Compressing the object
C. Immersing the object in water
D. Placing the object on a different planet
PLZ HELP
Answer:
D
Explanation:
The weight of an object will change if the object is brought farther away from Earth, or placed on a different planet since the force of gravity on the object will change. However, the mass of the object will remain the same regardless of whether the object is on Earth, in outer space, or on the Moon. hope this helps have a good day :)
A forest area is being used for a new housing development. Most of the trees have been removed to make room for the
new houses, Predict the impact that this will have on the birds in the area.
Answer:
The correct answer would be - lose their native habitats are forced to migrate into new areas in search of shelter and food.
Explanation:
The removal of trees or deforestation to build a housing or city planning or development impact the birds and other animals of that area. Cutting most of the trees from the area will result in a decrease in available food, shelter, and breeding habitat.
It causes complete removal of bird species and forced them to migrate to a new place in search of places that will provide a source of shelter and food for birds.
The cold water from deep in the ocean contains
Answer:
water... OH AND FISH
Explanation:
Answer:
Deep ocean water makes up about 90% of the volume of the oceans. Deep ocean water has a very uniform temperature, around 0-3 °C, and a salinity of about 3.5% or as oceanographers state as 35 ppt (parts per thousand).
Explanation:
Consider five solutions that all have the same mass of solute in 100.0 mL of solution. Which has the highest concentration as measured in molarity
Answer:
d
Explanation:
a. KCl
b. NaCl
c. Na2SO4
d. NaF
e. CaCl2
The molarity of a solution is a measure of the number of moles of solutes per volume (in liters) of the solution.
The number of moles of a solute depends largely on the mass and the molar mass of the solute. Hence,
mole = mass/molar mass
Equal amounts of KCl, NaCl, Na2SO4, NaF, and CaCl2 would have a different number of moles due to a difference in their molar mass. The higher the molar mass, the lower the number of moles, and vice versa.
The molar mass (in g/mole) of each of the solute compounds is as follows
KCl - 74.55
NaCl - 58.44
Na2SO4 - 142.04
NaF - 41.99
CaCl2 - 110.98
NaF has the lowest molar mass and, hence, would have the highest number of moles. This means that when an equal amount of the substances above is dissolved in the same amount of water, NaF would have the highest molarity.
The correct option is d.
Name the functional Group in
CH₃CO₂H
Answer:
•Name the Functional Group in CH₃CO₂H
CH₃COOH ( acetic acid)→ Carboxylic acid (-COOH group)
A cupcake recipe designed to produce 18 cupcakes calls for 260 grams of
flour. Determine the quantity of flour that would be required to make 22
cupcakes. (Round the final answer to four decimal place.)
Answer:
317.7778 g
Explanation:
Given data:
Flour required for 18 cup cakes = 260 g
Flour required for 22 cup cakes = ?
Solution:
We will calculate the flour required for 1 cup cake.
260 g /18 = 14.4444 g
Fluor required for 22 cupcakes,
22× 14.4444 g = 317.7778 g
In short,
22 cupcake/18 cup cake×260 g = 317.7778 g
What is the madd in grams of 0.40 moles of sodium borohydride, NaBH4
Answer:
Mass = 15.1 g
Explanation:
Given data:
Number of moles of NaBH₄ = 0.40 mol
Mass in gram = ?
Solution:
Formula:
Mass = number of moles × molar mass
Molar mass of NaBH₄ = 37.83 g/mol
By putting values,
Mass = 0.40 mol × 37.83 g/mol
Mass = 15.1 g
Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia . What mass of ammonium phosphate is produced by the reaction of of phosphoric acid
Answer:
4.3 g
Explanation:
Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia . What mass of ammonium phosphate is produced by the reaction of 2.8 g of phosphoric acid?
Step 1: Write the balanced equation
3 NH₃ + H₃PO₄ ⇒ (NH₄)₃PO₄
Step 2: Calculate the moles corresponding to 2.8 g of H₃PO₄
The molar mass of H₃PO₄ is 97.99 g/mol.
2.8 g × 1 mol/97.99 g = 0.029 mol
Step 3: Calculate the moles of (NH₄)₃PO₄ produced from 0.029 moles of H₃PO₄
The molar ratio of H₃PO₄ to (NH₄)₃PO₄ is 1:1. The moles of (NH₄)₃PO₄ produced are 1/1 × 0.029 mol = 0.029 mol.
Step 4: Calculate the mass corresponding to 0.029 moles of (NH₄)₃PO₄
The molar mass of (NH₄)₃PO₄ is 149.09 g/mol.
0.029 mol × 149.09 g/mol = 4.3 g
6)
How many joules of heat energy must be added to 5 grams of liquid water to change its
temperature from 10°C to 30°C?
A)
83.6 joules
B)
100 joules
C)
312.6 joules
D)
418 joules
Answer:
D) 418 J
Explanation:
Step 1: Given and required data
Mass of water (m): 5 gInitial temperature: 10 °CFinal temperature: 30 °CSpecific heat capacity of water (c): 4.184 J/g.°CStep 2: Calculate the temperature change (ΔT)
ΔT = 30 °C - 10 °C = 20 °C
Step 3: Calculate the heat required (Q)
We will use the following expression.
Q = c × m × ΔT
Q = 4.184 J/g.°C × 5 g × 20 °C = 418 J
what process is the foundation of almost all food webs
Answer:
The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water. This establishes the beginning of energy flow through almost all food webs
Why is the earth atmosphere located above earth crust
Answer:
The atmosphere is the thin envelope of gas molecules surrounding the Earth; it is held down by Earth's gravitational pull. The atmosphere is concentrated at the Earth's surface and rapidly thins as you move upward, blending with space at about 100 miles above sea level
Explanation: science
Answer:
Öncelikle burda soru Why is the earth atmosphere located above earth crust yani Türkçe olarak Dünya atmosferi neden yer kabuğunun üzerinde yer alıyor diyor
How many joules of heat are absorbed when 10.00 grams of water is completely vaporized at its boiling
point?
Answer:158.2 J
Explanation: Use your equations and fill in
*
Gravity affects the mass of a brick.
True
False
Answer:
True
Explanation:
Because anything that has mass also has gravity
What would happen if a plant was unable to receive pollen? A.the plant would continue to produce fruits and seeds. B.the plant would be unable to produce fruits and seeds.
C.Instead of the pistil producing pollen, the ovule would produce it.
D.Instead of the stamen producing pollen, the stigma would produce it.
Answer:
I think its B only because nothing else makes sense
Explanation:
but you should take your best guess
To solve this we must be knowing each and every concept related to plant. Therefore, if a plant was unable to receive pollen then the plant would be unable to produce fruits and seeds. The correct option is option B.
What is plant?Plants are mostly photosynthetic eukaryotes in the Plantae kingdom. Traditionally, the plant kingdom comprised all non-animal living creatures, including algae and fungi; but, all current definitions include Plantae exclude fungi and certain algae, as well as prokaryotes.
According to one definition, plants belong to the group Viridiplantae (Latin for "green plants"), which is sister to the Glaucophyta and includes green algae as well as Embryophyta (land plants). If a plant was unable to receive pollen then the plant would be unable to produce fruits and seeds.
Therefore, if a plant was unable to receive pollen then the plant would be unable to produce fruits and seeds. The correct option is option B.
To know more about plant, here:
https://brainly.com/question/14198295
#SPJ2
The Xs show the location of beanbags a student tossed at a target. The
student was aiming for the center circle. Which words best describe the
student's results?
A. Low precision, low accuracy
O B. High precision, low accuracy
O C. High precision, high accuracy
O D. Low precision, high accuracy
Answer:
It is D low precision, high accuracy
Explanation:
I got it correct
The Xs show the location of beanbags a student tossed at a target. The student was aiming for the center circle. Low precision, high accuracy best describe the student's results. Therefore, option D is correct.
What is precision ?There are two ways to assess observational error: accuracy and precision. Precision measures how closely two measurements are to one another, whereas accuracy measures how close a group of measurements is to its actual value. In other words, precision is a measure of statistical variability and a description of random errors.
The proximity of two or more measurements to one another is referred to as precision. Using the aforementioned example, your measurement is extremely accurate if you weigh a certain substance five times and obtain 3.2 kg each time. Accuracy is not necessary for precision.
Regardless of whether or whether two or more measurements are correct, precision is described as "the property of being exact" and relates to how close two or more measurements are to one another.
Thus, option D is correct.
To learn more about the precision, follow the link;
https://brainly.com/question/28336863
#SPJ5
A sample of carbon dioxide gas that has a volume of 14.6 L at STP contains how many
mol(s) of gas (to three significant figures).
Answer:
n = 0.651 mol
Explanation:
Given data:
Volume of CO₂ = 14.6 L
Temperature = standard = 273.15 K
Pressure = standard = 1 atm
Number of moles of CO₂ = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
by putting values,
1 atm × 14.6 L = n × 0.0821 atm.L/ mol.K × 273.15 K
14.6 L. atm = n × 22.43atm.L/ mol
n = 0.651 mol
2. A girl on a bike is accelerating at a rate of 5 m/s2 and has a total mass of 60 kg. How much force is the girl applying to her bike to move at this rate? *
Answer:
300N................
Explanation:
F=ma
m=60
a=5
