Calculate the mass of an object that has a density of 3.52g/cm^3 and
a volume of 5000 cm^3. Note that Mass = Volume X Density
Answer:
17.6kg
Explanation:
mass = Volume × Density
mass = 5000cm^3 × 3.52g/cm^3
mass = 17600g = 17.6kg
If 5 moles of He gas at a pressure of 4.3 atm have a temperature of 277 K, what is the volume?
Answer:
PV= n RT
4.3×y = 5×277
4.3y =1385
4.3y÷ 4.3y = 1385 ÷ 4.3y
y = 322
2. What is peat?
the aromatic compounds that are part of coal
O a soft, spongy material that may be changed into coal
O a mixture of methane, ethane, and other gaseous hydrocarbons
a very hard, dense form of coal
Answer:
a soft, spongy material that may be changed into coal
Explanation:
Which organism in a food web would be best described as a recycler?
O A.
Cottontail rabbit
B.
Termite
C.
Fungi and bacteria
D.
Red fox
C,
takes dead things, makes them into other things
How do some insects take advantage of the surface tension of water?
The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide
(Mgo)
2Mg + O2 → 2Mgo
The molar mass of Oz is 32.0 g/mol. What mass, in grams, of Oz is required to react completely with 4.00 mol of Mg?
2.00
64.0
128
256
Answer:
64
Explanation:
B
Which of the following questions would assist a student to differentiate between Earth’s major biomes?
A. Does the biome receive high levels of precipitation?
B. Does the biome consist of more plants than animals?
C. Does the biome consist of biotic and abiotic factors?
D. Does the biome consist of organisms with adaptations for survival in the biome?
Answer:
a
Explanation:
does the blome receive high levels of precipitation
Answer:
A.Does the biome receive high levels of precipitation?
Explanation:
A balloon has a volume of 1.40 L at 24.0ºC. The balloon is heated to 48.0°C. Calculate the new volume of the balloon.
A 1.50 L
B 2.10 L
C 1.70 L
D 1.80 L
Answer:I am not sure how
Explanation: sorry free trial
How simple machines make our works easier and faster (Question answer) (Class-6)
What types of reactions take place in hot packs and cold packs? What evidence shows that
both hot packs and cold packs experience chemical reactions? Drag and drop the text into
the correct boxes.
Answer:
reaction to cold pack: change in temperature
Evidence of a chemical reaction etc is change in composition
Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa chemical reaction but cold packs
Answer:
Cold pack: absorbs heat (endothermic reaction)
Hot pack: releases heat ( exothermic reaction)
Explanation:
when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.
What is the SUM of the coefficients for the balanced chemical equation below?
PLEASEEEE
A sodium nitrate solution was prepared in the lab to have a concentration of 0.467 M. If 50. mL of a 6.00 M stock solution was used to prepare this sodium nitrate solution, what volume of water was added to the original 50. mL of stock solution? Provide the appropriate units (mL or L) to your response.
the treaty of versailles ended world war i, but some of the terms of the treaty contributed to the beginning of world war ii. which was one of the terms of the treaty? the answer would be "germany was forces to pay reparations to the allied countries.". i hope this .
Explanation:
5F248+ 2NH3(8) ► NF418 + 6HF
a) If you start with 3.6 g of NH, and excess F2, how many liters of HF at STP can you make?
Answer:
14.2L at STP
Explanation:
Based on the problem, 2 moles of NH3 produce 6 moles of HF. To solve this question we have to convert the mass of NH3 to moles. With the chemical equation find the moles of HF and using PV = nRT find the liters of HF:
Moles NH3 -Molar mass: 17.031g/mol-
3.6g NH3 * (1mol / 17.031g) = 0.211 moles NH3
Moles HF:
0.211 moles NH3 * (6mol HF / 2mol NH3) = 0.634 moles HF
Volume HF
PV = nRT; V = nRT/P
Where V is volume in liters, n are moles of the gas = 0.634 moles, R is gas constant = 0.082atmL/molK, T is absolute temperature = 273.15K at STP and P is pressure = 1atm at STP.
Replacing:
V = 0.634moles*0.082atmL/molK*273.15K / 1atm
V = 14.2L at STP
How many grams of CO2 are produced from 6.7 L of O2 gas at STP?
13 g CO₂
General Formulas and Concepts:Chemistry
Atomic Structure
Reading a Periodic TableMolesSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KStoichiometry
Using Dimensional AnalysisMath
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right Explanation:Step 1: Define
Identify variables
[Given] 6.7 L O₂
[Solve] g O₂
Step 2: Identify Conversions
[STP] 22.4 L = 1 mol
[PT] Molar Mass of O: 16.00 g/mol
[PT] Molar Mass of C: 12.01 g/mol
Molar Mass of CO₂: 12.01 + 2(16.00) = 44.01 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 6.7 \ L \ O_2(\frac{1 \ mol \ O_2}{22.4 \ L \ O_2})(\frac{44.01 \ g \ O_2}{1 \ mol \ O_2})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 13.1637 \ g \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
13.1637 g CO₂ ≈ 13 g CO₂
How many moles of Fe₂O₃ are there in 0.54 liters of a 1.6 M solution?
Answer: 0.86 mol
This is a molarity problem, in which M is defined by:
[tex]\frac{n(moles of solute)}{v(liters of solution)}[/tex]and the units are moles/liter
With this information in mind, we can plug in M and v already so that:
1.6 [tex]\frac{mol}{L}[/tex]= [tex]\frac{xmol}{0.54L}[/tex] of Fe₂O₃
If we multiply 0.54 L from both sides, we will get:
0.864 mol = x mol of Fe₂O₃
Rounding that to sigfigs, we get that the number of moles within this Fe₂O₃ solution is 0.86 mol; therefore, that is the answer.
I hope this helped!
The volume of a gas decreases to half of its original volume, but the gas maintains the same number of moles and temperature. According to the ideal gas law, what will most likely happen to the pressure
When H forms a bond with H2O to form the hydronium ion H3O , this bond is called a coordinate covalent bond because
Answer:
both bonding electrons come from the oxygen atom
Explanation:
A coordinate covalent bond is said to be formed when an electron pair is donated into a empty orbital of an atom from a filled orbital of another atom.
In this type of covalent bond, the shared electron pair is furnished by only one of the bonding species.
The bonding between H^+ and H2O to form H3O^+ involves donation of a lone pair of electrons on oxygen into the empty 1s orbital of H^+ hence the two bonding electrons come from oxygen. This is why the bond is called a coordinate covalent bond.
2CO +02 2CO2 what is the mole ratio of carbon monoxide to carbon
dioxide
A 1.2
B 2.2
C 2:1
D 3:1
Answer:
B 2:2
Explanation:
Mole ratio is the comparison of the ratio of two compounds or elements in a chemical reaction. In a balanced equation, the moles of a particular compound or element is written as a coefficient. This means that mole ratio is the ratio of the coefficient of two substances in a reaction.
In this balanced chemical equation given as follows:
2CO + 02 → 2CO2
The number of moles/coefficient of carbon monoxide (CO) is 2 while that of carbon dioxide (CO2) is 2.
Hence, the mole ratio of CO to CO2 is 2:2
Suggest whether potassium metal can be used to react with an acid to prepare a soluble salt. Explain your answer.
Yes, potassium metal can be used to react with an acid to prepare a soluble salt.
Acids react with metals to yield the corresponding metal salt and hydrogen gas.
One of the properties of metals is their ability to react with dilute acids to yield a soluble salt and hydrogen gas. This is a common reaction for all metals that are above hydrogen in the activity series.
Potassium can react with a hypothetical acid HB as follows;
2K(s) + 2HB(aq) ------> 2KB(aq) + H2(g)
https://brainly.com/question/6136372
calculate the ph of a solution having [OH-] = 8.2 x 10 ^-8M
Answer:
6.91Explanation:
To find the pH we must first find the pOH
The pOH can be found by using the formula
pOH = - log [ {OH}^{-} ]
We have
[tex]pOH = - log(8.2 \times {10}^{ - 8} ) \\ = 7.086186...[/tex]
pOH = 7.09
Next we use the equation
pH = 14 - pOH
We have
pH = 14 - 7.09
We have the final answer as
6.91Hope this helps you
Please hurry Which of the following statements is true?
• A positively charged atom has more electrons than protons.
• A positively charged atom has more protons than neutrons.
• A positively charged atom has more neutrons than protons.
• A positively charged atom has no electrons.
• A positively charged atom has more protons than electrons.
Answer:
E, answer 5, A positively charged atom has more protons than electrons.
Explanation:
3. A PS6 plugged into a 120 V outlet uses 3 Amps. What is the Resistance rating of
the power cord?
voltage: V=
current: 1 =
resistance: R=
V=IxR
1=VR R
Underline/Bold Which Equation we are going to use:
= V
Plug in the numbers from above and solve for our answer:
Answer:
R = 40 ohms
Explanation:
Given that,
The voltage of outlet, V = 120 V
Current flowing through the device, I = 3 A
We need to find the Resistance rating of the power cord. Let the resistance is R. We know that,
Ohm's law, V = IR
Put all the values,
[tex]R=\dfrac{V}{I}\\\\R=\dfrac{120}{3}\\\\R=40\ \Omega[/tex]
So, the resistance rating of the power cord is equal to 40 ohms.
How would the intensity of light from the bulb change if you were to: a) Dissolve some additional CuSO4(s) in the CuSO4 solution?
Answer:
The intensity of the light bulb increases
Explanation:
The conductivity of a solution depends on the concentration of ions in solution. This implies that, if the concentration of ions in solution is increased, the conductivity of the solution increases accordingly.
If we add more CuSO4(s) to the CuSO4 solution, the concentration of ions in the solution and consequently the conductivity of the solution increases.
Therefore, the intensity of the light bulb increases.
how could you get the crystals in a supersaturated solution back into the solution?
match these items. three-dimensional bonding, hardest natural substance, used as lubricant, nonconductor, weak planar bonds, carbon black or soot
Answer:
1. three-dimensional bonding
Diamond
2. Hardest natural substance
diamond
3. Used as lubricant
Graphite
4. nonconductor
Diamond
5. Weak, planar bonds
Graphite
6.Carbon black or soot
Amorphous
Explanation;
sorry im late, hopefully this can help somebody :)
what determines the identity of a substance?
proton
neutron
electron
photon
Answer:Typically, the identity of a substance can be described by a: chemical name, for example, benzene; number, for example, EC number 200-753-7, and.
Explanation:chemical composition, for example, >99 % benzene and <1 % toluene. The composition is determined by chemical analysis.
Answer:
proton
Explanation:
thats what my bio teacher just said
Which of the following will conduct electricity?
Question 9 options:
A) Acid solutions only
B) Base solutions only
C) Acid solutions and base solutions
D) Neither acid solutions nor base solutions
Answer:
I think is c
Explanation:
I hope this helps you
Answer:
Acid solutions and base solutions
Explanation:
1. If CO2 is being produced in the solution at a faster rate than H2CO3, is the rate of the forward or reverse reaction faster?
Answer:
I believe that it would be faster but the reaction would not happen immediately. It would take a long time for the effect to start kicking in but it will definitely speed up the process of CO2 being released into our atmosphere.
Explanation:
If CO₂ is being produced in the solution at a faster rate than H₂CO₃, then the rate of the forward reaction is faster.
What is the rate of a reaction?Rate of any reaction tells about the duration of the completion of reaction to produce products.
Given chemical reaction is written as:
H₂CO₃ ⇄ CO₂ + H₂O
In the question it is given that CO₂ is produced at the faster rate, and it is the product of the forward reaction. So, we conclude that rate of forward reaction is faster.
Hence, the rate of forward reaction is faster.
To know more about rate of a reaction, visit the below link:
https://brainly.com/question/7694417
what are the best topics to write a project work on EVS and Chemistry
Answer:
It is better to do chemistry
Explanation:
So that you will learn more of chemicals
What are 3 examples of making diluted solutions in "regular" life?
what are examples of diluted?
Answer:
Do it your self bro
Explanation:
You lazy bum do it yourself