Answer:
A chemical change.
Explanation:
As the temperature rises fast, the kind of change that can be said to be occurring is a chemical change.
One of the way to know of a chemical change is occurring is that new kinds of matter is formed and also, there is either an evolution or absorption of heat energy in the process.
Since heat is liberated in this change, an exothermic chemical reaction is taking place.
So this is a chemical change.
You are making a temperature measurement with a lab thermometer. The increments (markings) are 1°C. You see that the temperature is about 1/3 of the way from 21°C to 22°C. How would you record this temperature? How many significant figures does it have? In what place value is the smallest certain digit? In what place value (tens, ones, tenths, etc.) is the uncertain digit?
Answer: 21.3, 3 sig figs, units certain, tenths uncertain
Explanation:
The temperature is 21.3 degrees Celsius, This temperature has 3 significant figures. The smallest certain digit is in the tenth place and the uncertain digit is in the decimal place.
What are significant figures?
The number that is given as digits is established using significant figures. A meaningful representation of numbers is carried by these digits. Frequently, significant numbers are employed in place of figures. By counting all of the values beginning with the first non-zero digit on the left, we may determine the number of significant digits. 12.45, for instance, contains four significant numbers.
Therefore, in the above observation, the temperature is 21.3 degrees Celsius, This temperature has 3 significant figures. The smallest certain digit is in the tenth place and the uncertain digit is in the decimal place.
Read more about significant digits, here
https://brainly.com/question/1658998
#SPJ2
HELPP nowww plssss!!!!
If the common element of Fluorine-9 and one of the isotopes is Fluorine-10, what does the -10 tell us about the element and how many protons and neutrons does the element have?
flourine have 9 proton
19 neutrons and 9 electron
mark be a brain list
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
PLEASE HELP
What heat transfer is a Heater.
Answer:
All electric heaters make use of one or more of the fundamental heat transfer mechanisms – namely convection, conduction, or radiation.
For regular...
Conduction is heat transfer by direct contact, like frying an egg. Convection is heat transfer by the movement of gases or liquids, like most home furnaces, clothes dryers, or car heaters. Radiation is the transfer of heat in waves through space, like the sun or a fire.
8. The size and shape of an object are some of its....
Answer:
Characteristics...
Explanation:
I hope that's right, if not super sorry. I'm not the smartest. I tried my best if it's wrong
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%
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.
Learn more about precipitation here: https://brainly.com/question/866725
What is the element in period 3 that required requires the least amount of energy?
True or false. The particulates left from combustion have the same mass as the substance that was burned. Giving Brainliest!
The study of chemicals is called chemistry.
The correct answer is true.
What is combustion?The process of burning anything in the presence of oxygen is called combustion.According to the question, the statement is right because the solid amount is converted into the gas after burning but the mass remains constant.
law of conservation of massit states that the mass of the element remains constant before and after the reaction.Hence, the correct answer is true.
For more information about the question, refer to the link:-
https://brainly.com/question/1255220
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
In Raoult’s law, what happens to the partial pressure of the solution when the mole fraction of the solvent increases?
Answer: c. it increases
Explanation:
helpppp nowww plsss!!
Answer:
Solar energy.
Explanation:
Solar Energy,
Renewable sources are those, which can be used again and again so, solar energy is the answer.
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!
WILL GIVE BRAINLIEST
at which distance from refrigerator door would a magnetic force of attraction be weakest
A 7cm
B 3cm
C 1cm
D 10cm
Answer:
10 cm
Explanation:
because the magnetic force of attraction becomes weaker from a greater distance.
Answer:
D 10cm
Explanation:
As the distance between the two objects(magnet and Ferromagnetic Metals and Alloys) increases the magnetic for will decrease
if a iron nail is kept 1cm far from a magnet then the magnet will atract it easily but if the same iron nail is kep 3cm far from the magnet then the magnet won't attract it easily .
(Ferromagnetic materials such as iron, nickel and cobalt are attracted to magnets, as well as rare-earth metals like gadolinium, neodymium and samarium.)
Hope you've understood
5. Identify each of the following as an element, a mixture, or a compound.
a. aluminum foil
b. air
C. water
d. salt water
e. copper
wire
f. steel
Answer:
Aluminum foil ~ element
Air ~ mixture
Water ~ compound
Salt Water ~ mixture
Copper Wire ~ element
Steel ~ element
What occurs when a molecule combines with Oxygen and produces heat?
A. It dissolves
B. It precipitates
C. It Evaporates
D. it combusts
Answer:
D. it combustsExplanation:
Combustion is when fuel reacts with oxygen to release heat energy. Combustion can be slow or fast depending on the amount of oxygen available. Combustion that results in a flame is very fast and is called burning. Combustion can only occur between gases.
chemical equation for cycloheptane (l)
Answer: C7H14 - PubChem.
Explanation:
53.0 g of silver (1) nitrate reacts according to the reaction shown below:
AgNO3 + KCI — AGCI + KNO3
Find the theoretical yield of AgCl. If the amount of AgCl actually produced is 38.5 grams,
what is the percent yield of the experiment?
Answer:
Percent yield = 86.09%
Theoretical yield of AgCl = 44.72 g
Explanation:
Given data:
Mass of silver(1) nitrate = 53.0 g
Actual yield of AgCl = 38.5 g
Theoretical yield of AgCl = ?
Percent yield = ?
Solution:
Chemical equation:
AgNO₃ + KCl → AgCl + KNO₃
Number of moles of AgNO₃:
Number of moles = mass/molar mass
Number of moles = 53.0 g/ 169.87 g/mol
Number of moles = 0.312 mol
now we will compare the moles of AgNO₃ and AgCl
AgNO₃ : AgCl
1 : 1
0.312 : 0.312
Theoretical yield of AgCl:
Mass = number of moles × molar mass
Mass = 0.312 mol × 143.32 g/mol
Mass = 44.72 g
Percent yield:
Percent yield = (actual yield / theoretical yield) × 100
Percent yield = ( 38.5 g / 44.72 g ) × 100
Percent yield = 86.09%
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
Polar air masses bring warm temperature and have lower air temperature? T or F
Answer:
t? im pretty sure have a good day
Which set of coefficients will balance this chemical equation?
C2H4(g) + _O2(g) → 2C02(g) + 2H2O(g)
Answer:The answer is D.1,3
Explanation:
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!!
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.
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.
Learn more about conversions here:
brainly.com/question/17743460
brainly.com/question/24530464
For the balanced equation 2C6H6OS+1102=12CO+6H2O+2SO3 how many moles of C6H6OS reacted if 0.474 moles of SO3 are produced?
Answer:
0.474 moles of C₆H₆OS
Explanation:
Step 1: Write the balanced equation
2 C₆H₆OS + 11 O₂ ⇒ 12 CO + 6 H₂O + 2 SO₃
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of C₆H₆OS to SO₃ is 2:2.
Step 3: Calculate the moles of C₆H₆OS reacted if 0.474 moles of SO₃ are produced
We will use the previously established molar ratio.
0.474 mol SO₃ × 2 mol C₆H₆OS/2 mol SO₃ = 0.474 mol C₆H₆OS
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)
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:
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: