Answer:
Q = 440 J
Explanation:
Given data:
Heat required = ?
Initial temperature = 25°C
Final temperature = 40°C
Mass in gram = 20 g
Specific heat capacity = 1.1 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 40°C - 20°C
ΔT = 20°C
Q = 20 g×1.1 J/g.°C × 20°C
Q = 440 J
What happens when samples of matter interact?
Answer: matter and its interaction with energy. Matter has mass and occupies space. A Substance is matter that cannot be separated into other kinds of matter by physical means.
Explanation:
Please help! Very important and will give brainliest to correct answer!
Two gas jars are connected to each other, but they are separated by a closed valve. One gas jar contains oxygen, and the other is empty. What will happen when the valve is opened?
Select one:
a. Oxygen molecules will remain in their original jar because of the very high density of the oxygen molecules.
b. Oxygen molecules will remain in their original jar because there is enough space in the original jar.
c. Oxygen molecules will spread evenly throughout both jars because of weak intermolecular forces.
d. Oxygen molecules will spread through both jars because of the high molecular weight of oxygen.
Answer:
c
Explanation:
they are a gas
Answer:
c. Oxygen molecules will spread evenly throughout both jars because of weak intermolecular forces.
Explanation:
Gases mold to take shape and fill the containers they're in.
Hope this helps :)
When a real gas is placed into a container at high pressure, why might the pressure of the gas be higher than what was predicted by the ideal gas law?
Answer:The correct answer is A.
Explanation:Properties of ideal gases have different volumes under very high pressure. These gases take up additional volume when there is high pressure exerted, and the predicted volume of these gases will end up being smaller than the actual values of the gas volumes. Therefore, the true volume of the gases will be higher than the low ones that were predicted, giving your answer A.
How has the human population changed during the past 50 years
Answer:
The human population has increased by the billions, and we have been creating better and more complex technology over the years. So, overall there is a difference between now and 50 years ago.
A substance that loses electron and itself is oxidized is called a?
Answer:
oxidation-reduction or redox reaction
Explanation:
n
Convert 2.345 centimeters cubed to inches cubed. 1inch = 2.54cm
Answer:
0.92322835
Explanation:
0.92322835 rounded= 0.9 or 0.92
2.345 centimeters cubed is equal to 0.1431 inches cubed.
Units of volume are used to measure the amount of space occupied by an object or substance. Volume is a three-dimensional quantity and is typically expressed in cubic units. Some common units of volume include:
Cubic Meter (m³): This is the SI unit of volume and represents the volume of a cube with sides measuring one meter.Cubic Centimeter (cm³): This is a smaller unit of volume often used for measuring the volume of small objects or substances. It is equal to the volume of a cube with sides measuring one centimeter.Liter (L): The liter is a commonly used unit of volume in everyday life. It is equal to one cubic decimeter or 1,000 cubic centimeters.Milliliter (mL): The milliliter is a smaller unit of volume often used for measuring liquids or small quantities. It is equal to one-thousandth of a liter or one cubic centimeter.Other units of volume, such as gallons, cubic feet, and ounces, are also used in specific contexts or regions. It is important to use appropriate conversion factors when converting between different units of volume.
1 inch = 2.54 cm.
1 cm = 1/2.54 inches
(1 cm)³ = (1/2.54 inches)³
1 cm³ = (1/2.54)³ inches³
2.345 cm³ = 2.345 × [(1/2.54)³] inches³
2.345 cm³ ≈ 0.1431 inches³ (rounded to four decimal places)
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please help i’ll give you brainlest
Answer:
2.6 L
Explanation:
[tex]\frac{0.87L N_{2} }{22.4L} * \frac{3 H_{2}}{1 N_{2}} *22.4L=2.6L[/tex]
Answer:
2.6 liters
Explanation:
my testes
many fish, insect, and including the common housefly, produce large amounts of glycerol (C³H³O³) in cold areas to lower the freezing point of their blood. what percent of oxygen is percent in glycerol
A. 52.11% B. 51.11%
C. 53.11% D. 50.11%
Answer:
A. 52.11%
Explanation:
Percentage of Oxygen= (mass of Oxygen in glycerol/ mass of glycerol) x 100
= ((16*3)/ 92.11) x 100
=52.11%
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According to the Periodic Table, the properties of calcium are most like.
1. manganese
2. magnesium
Answer: 2. magnesium
Explanation: correct spelling...?
What mass of KCl is required to make a 0.680 m solution with 5.00 kg of water? a) 199 g b) 548 g c) 253 g d) 373 g
Answer:
it is A.
Explanation:
A.) 199g
What did Darwin think about Earth and life while he was forming his theory of evolution?
Answer:Charles Darwin was a British naturalist who proposed the theory of biological evolution by natural selection. Darwin defined evolution as "descent with modification," the idea that species change over time, give rise to new species, and share a common ancestor.
Explanation:
Silver is the metal with the highest conductivity, followed by copper, gold and aluminium. Why do you think copper and aluminium are used for electrical wire and cable rather than silver and gold?
Explanation:
Copper and aluminum are used for electric wires and cables because they are readily available and cheaper to produce.
The abundance of copper and aluminum is higher compared to silver and gold.
This makes the metals easier to mine than silver and gold. It would be impossible to use the scare amount of gold and silver to make electric wires and cables.
This use cannot be sustained.
What is the element in period 3 that required requires the least amount of energy?
Consider a car being acted on by balanced forces. Can you conclude whether the car is moving or at rest? Explain your response.
Since the car is being acted upon by balanced forces, the car is at rest. as the forces are being balanced.
What is a force?
Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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Convert 4.56 g/ml to lb-fl-oz
Answer:
g-lb 0.01005308
ml-fl Oz 0.1541919
The value of 4.56 g/mL is 0.296 lb/fl-oz.
Explanation:
Given:
The density with 4.56 g/mL
To find:
Convert 4.56 g/ml to lb/fl-oz
Solution:
In 1 pound there are 453.592 grams:
[tex]1 pound = 453.592 grams\\1 grams=\frac{1}{453.592 } pounds\\4.56 g/mL=4.56\times\frac{1}{ 453.592} lb/mL\\=0.0100 lb/mL[/tex]
In 1 fluid ounce there are 29.5735 milliliters:
[tex]1 \text{fluid ounce} = 29.5735 milliliter\\1 mL=\frac{1}{29.5735} fl-oz\\0.0100 lb/mL=\frac{0.0100}{\frac{1}{29.5735}} lb/fl-oz\\0.0100 lb/mL=0.0100 \times\frac{29.5735}{1} lb/fl-oz\\=0.296 lb/fl-oz[/tex]
The value of 4.56 g/mL is 0.296 lb/fl-oz.
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In which environment is erosion likely to have the most impact?
a steep hillside with little vegetation and strong downpours
a steep hillside covered with grasses and mild downpours
a flat valley with little vegetation and heavy downpours
a flat valley covered with grasses and mild downpours
Answer:
A. Steep hillside, little vegetation, strong downpours
Explanation:
between a steep hill and a flat valley, the hill is more likely to be affected because of gravity. with a valley theres less places for the dirt to actually move to. So C and D are not correct
a lack of vegetation and heavy downpour is the perfect condition for erosion. plants' root system makes dirt and rock more stable. without a lot of roots to hold the dirt in place and absorb water before it runs over the rocks and breaks them down, heavy rain would be a lot more likely to erode the area. so B isnt right either
Question Determine the concentration of hydroxide ions for a 25 °C solution with a pH of 8.22. . Your answer should contain 2 significant figures.
Answer:
[tex][OH^-]=1.7x10^{-6}M[/tex]
Explanation:
Hello!
In this case, since the pOH of a solution can be computed when knowing the pH as shown below:
[tex]pH+pOH=14\\\\pOH=14-8.22=5.78[/tex]
And therefore, the concentration of hydroxide ions based on the definition of pH:
[tex][OH^-]=10^{-pOH}[/tex]
In such a way, we obtain:
[tex][OH^-]=10^{-5.78}=1.7x10^{-6}M[/tex]
Best regards
What is the molar mass of a compound compared to an element?
Answer: The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol).
Explanation: The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms.
Select all of the ways collection areas use to gain water. precipitation falls direction into the collection area runoff from precipitation water evaporates from the collection area
"Precipitation falls direction into the collection area" and "runoff from precipitation" are the correct ways.
Ways of collecting waterThe ways such as "Precipitation falls direction into the collection area" and "runoff from precipitation" through which collection areas use to gain water because these two activities bring water to the collection areas
While on the other hand, "water evaporates from the collection area" is the activity which removes water from the collection area so we can conclude that "Precipitation falls direction into the collection area" and "runoff from precipitation" are the correct ways.
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Why water is able to stick to the side of a glass
Answer:
Water uses adhesive forces that allow it to stick to certain surfaces such as glass.
Explanation:
When the angle between vertical direction and the glass wall is small, surface tension is stronger and the component of gravity perpendicular to the glass wall is small. The result of this causes water to stick to the side of a glass.
Hope this helps!
1. Write the equilibrium constant expression for the following:
CS2(g) + 4 H2(g) ⇌ CH4(g) + 2 H2S(g) Kp =
2. Calculate the value of Kp for the above reaction if the equilibrium pressures for each of the
components are as follows:
ௌమ = 0.500 , ுమ = 0.100 , ுర = 1.00 , ுమௌ = 0.800
3. Given the above equilibrium reaction, predict in which direction the equilibrium will shift if the
pressure of the vessel is decreased. Explain in 2-3 sentences why
4. If the Kp of your reaction = 0.00274, calculate what Kc should be using the equation Kp = Kc(RT)Δn
5. For the reaction: A2(g) + B(g) ⇌ 2C(g) it is found that by adding 1.5 moles of C to a 1.0 L
container, an equilibrium is established in which 0.30 moles of B are produced.
a) What is [A] at equilibrium?
b) What is [B] at equilibrium?
c) What is [C] at equilibrium?
d) Write the expression for the equilibrium constant, Keq
e) Calculate the value for the equilibrium constant
6. Consider the reaction 2NO2(g) ⇌ N2O4(g) to be at equilibrium with
[NO2(g)] = 1.60 M, [N2O4] = 0.20 M, and Kc = 0.078.
1. Predict qualitatively what will happen to this reaction if more NO2 is added so that
[NO2(g)] = 2.00 M?
2. Predict qualitatively what will happen to this reaction if instead NO2 is removed so that
[NO2(g)] = 1.00 M?
7. Calculate the values for Qc for these two experiments.
(a) [NO2(g)] = 2.00 M and [N2O4] = 0.20 M: Qc =
(b) [NO2(g)] = 1.00 M and [N2O4] = 0.20 M: Qc =
8. What in general happens to a reaction if
(a) Qc Kc
9. A mixture of H2 and I2 is allowed to react at 448°C. When equilibrium is established, the
concentrations of the participants are found to be:
[H2] = 0.46 M, [I2] = 0.39 M and [HI] = 3.0 M.
The equation is: H2(g) + I2(g) ⇌ 2HI(g)
Calculate the value of Keq at 448°C.
10. CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
At 900 K, Kc = 1.56 for this reaction. A sample of water gas flowing over coal at 900 K contains a
1:1 mole ratio of CO(g) and H2(g), as well as 0.250 mol L–1 H2O(g). This sample is placed in a
sealed container at 900 K and allowed to come to equilibrium, at which
point it contains 0.070 mol L–1 CO2(g). What was the initial concentration of CO(g) and H2(g) in
the sample?
11. At 700 °C, hydrogen and iodine react according to the following equation.
H2(g) + I2(g) ⇌ 2HI(g) Kc = 49.0
Hydrogen also reacts with sulfur at 700 °C:
2H2(g) + S2(g) ⇌ 2H2S(g) Kc = 1.075 × 108
Calculate Kc for the following overall equilibrium reaction at 700 °C.
2I2(g) + 2H2S(g) ⇌ S2(g) + 4HI(g) Kc = ?
12. The KC for the reaction: PCl5(g) ⇌ PCl3(g) + Cl2(g) at 250°C is found to be 0.042. In an equilibrium
mixture of these species, it is found that [PCl5] = 0.012 M, and [Cl2] = 0.049 M. What is the
equilibrium [PCl3] at 250 °C?
13. At a certain temperature, the reaction: CO(g) + 2H2(g) ⇌ CH3OH(g) has a Keq = 0.500. If a reaction
mixture at equilibrium contains 0.210 M CO and 0.100 M H2, what is the equilibrium [CH3OH]?
14. Given the equilibrium equation: H2(g) + I2(g) ⇌ 2HI(g) at 448°C, Keq = 50.
If 3.0 mol of HI, 2.0 mol of H2, and 1.5 mol of I2 are placed in a 1.0 L container at 448°C, in which
direction will the reaction go? Towards the left or towards the right?
15. Given the equilibrium equation: H2(g) + I2(g) ⇌ 2HI(g) at 448°C, Keq = 50. If 5.0 mol of HI, 0.7071
mol of H2, and 0.7071 mol of I2 are placed in a 1.0 L container at 448°C, will a reaction occur?
16. Given the reaction: 4HCl(g) + O2(g) ⇌ 2H2O(g) + 2Cl2(g) ΔH = -113 kJ
How will the value of the equilibrium constant Keq at 550 oC compare with its value at 450 oC?
17. Using the principles postulated by Le Châtelier, predict which direction (left, right, or no change)
the given reaction will go if the following occurs:
4 NH3(g) + 5 O2(g) ⇌ 4 NO(g) + 6 H2O(g) ΔHrxn = -905.5 kJ/mole
a. Nitrogen monoxide is added to the vessel:
b. The pressure in the vessel is increased:
c. The reaction is cooled:
d. Carbon dioxide gas is pumped into the reaction vessel:
Answer:
c
Explanation:
it could honestly be wrong but I'm not sure
Write a balanced equation for copper metal and aqueous sulfuric acid react to form a solid copper (II) sulfate, liquid water, and sulfur dioxide solid.
Answer:
Cu (s) + 2H₂SO₄(aq) —> CuSO₄(s) + 2H₂O (l) + SO₂(s)
Explanation:
Copper metal => Cu
Sulphuric acid => H₂SO₄
copper (II) sulfate => CuSO₄
Water => H₂O
sulfur dioxide => SO₂
The equation for the reaction between copper metal and aqueous sulfuric acid can be written as follow:
Cu + H₂SO₄ —> CuSO₄ + H₂O + SO₂
The above equation can be balance as follow:
Cu + H₂SO₄ —> CuSO₄ + H₂O + SO₂
There are 2 atoms of S on the right side and 1 atom on the left side. It can be balance by writing 2 before H₂SO₄ as shown below:
Cu + 2H₂SO₄ —> CuSO₄ + H₂O + SO₂
There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 2 before H₂O as shown below:
Cu + 2H₂SO₄ —> CuSO₄ + 2H₂O + SO₂
Thus, the equation is balanced.
Include the phase of each reactant and product, we have:
Cu (s) + 2H₂SO₄(aq) —> CuSO₄(s) + 2H₂O (l) + SO₂(s)
The _____shows you how many molecules are present in the reaction.
Answer:
number of atoms
i think sorry if this isnt right x
Explanation:
How many moles are present in 63.80L of oxygen gas, O2?
Answer:
2.85moles of oxygen gas
Explanation:
Given parameters:
Volume of oxygen gas = 63.8L
Unknown:
Number of moles = ?
Solution:
We assume that the gas is under standard temperature and pressure. To find the number of moles, use the expression below:
1 mole of a gas at STP occupies a volume of 22.4L
So;
63.8L of oxygen gas will take up a volume of
[tex]\frac{63.8}{22.4}[/tex] = 2.85moles of oxygen gas
describe how plants might be affected if the inter molecular forces in water decreased? i need asap!
Answer:
Water has polar O-H bonds. The negative O atoms attract the positive H atoms in nearby molecules, leading to the unusually strong type of dipole-dipole force called a hydrogen bond. Since water has hydrogen bonds, it also has dipole-induced dipole and London dispersion forces.
Hope it helped!!
In the reaction 2Na3N-6Na+N, how many moles of Na are produced when 6 mol of Na3N
decompose?
moles of Na produced = 6 moles
Further explanationGiven
Reaction
2Na3N---> 6Na+N
6 moles of Na3N
Required
moles of Na
Solution
I don't really understand the reaction in the problem, all I know is the decomposition reaction of sodium azide NaN3
2NaN₃ → 2Na + 3N₂
The reaction coefficient shows the mole ratio of the compounds involved in the reaction
From the equation(balanced), mol ratio of Na : NaN₃ = 2 : 2, so mol Na :
= 2/2 x moles NaN₃
= 2/2 x 6 moles
= 6 moles
How many grams are in 2.2 moles of sodium hydroxide (NaOH)?
Answer:
1 mole is equal to 1 moles NaOH, or 39.99711 grams.
(( hoped this helped ))
Answer:
1 mole is equal to 1 moles Sodium Hydroxide, or 39.99711 grams. Note that rounding errors may occur, so always check the results.
How many grams of water could be made from 5.0 mol H2 with excess O2? 2 H2 + O2 --> 2 H2O
Answer:
Explanation:
5 moles of hydrogen gas would react with 2.5 of the available 3 moles of oxygen gas, to form 5 moles of water. The molar mass of water is 18 g/mol, so you would end up with 5 x 18 = 90 g of water.
The mass percent of hydrogen in CH₄O is 12.5%.
What is the mass percent?Mass percent is the mass of the element divided by the mass of the compound or solute.
Step 1: Calculate the mass of the compound.
mCH₄O = 1 mC + 4 mH + 1 mO = 1 (12.01 amu) + 4 (1.00 amu) + 1 (16.00 amu) = 32.01 amu
Step 2: Calculate the mass of hydrogen in the compound.
mH in mCH₄O = 4 mH = 4 (1.00 amu) = 4.00 amu
Step 3: Calculate the mass percent of hydrogen in the compound.
%H = (mH in mCH₄O / mCH₄O) × 100%
%H = 4.00 amu / 32.01 amu × 100% = 12.5%
The mass percent of hydrogen in CH₄O is 12.5%.
CO2 = 1.580 grams H2O = 0.592 grams Lookup the molar mass of each element in the compound Carbon = 12.0107 Hydrogen = 1.00794 Oxygen = 15.999 Calculate the molar mass of CH4O by adding the total masses of each element used. 12.0107 + 4 * 1.00794 + 15.999 = 32.04146 Now calculate how many moles of CH4O you have by dividing by the molar mass. m = 1.15 g / 32.04146 g/mole = 0.035891 mole Now figure out how many moles of carbon and hydrogen you have. Carbon = 0.035891 moles Hydrogen = 0.035891 moles *
Therefore, The mass percent of hydrogen in CH₄O is 12.5%.
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Calculate the mass of iron (iii) oxide that contains a trillion iron atoms
Answer:
Calculate the mass of iron(III) oxide (Fe20) that contains a trillion (1.000x 10") oxygen atoms. Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits. A chemist measures the amount of oxygen gas produced during an experiment. He finds that 9.2 g of oxygen gas is produced.
Explanation:
How many grams of ethanedioic acid is required to prepare 2M solution of the NaOH
Answer:
I don't know
Explanation:
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