Answer:
9.5625 gram
Explanation:
Molarity = mass in gram ÷ molar mass × volume in dm3
Mass in gram = molarity× molar mass × volume of solution in dm3
Mass in gram = 0.450×42.5×0.5=9.5625 g
PLEASE HELP I WILL GIFT 100 POINTS!!!!!
Answer:
Liquid A
Explanation:
the least dense will be at the top. like icecubes in water. the ice is less dense than the water so it floats
Answer:
Liquied A
Explanation:
It is at the top and it is the lightest if it is at the bottom then it has the most density
The_____form acidic compounds with hydrogen.
Answer:Halogens
Explanation:
I looked it up lol
which conversion factor do you use first to calculate the number of grams of fecl3 produced by the reaction of 30.3 g of fe with ci 2?
Answer:
162.2g FeCl3/2mol FeCl3
Explanation:
Answer:
I would say D. 162.2gFeCl3 / 2 mol FeCl3
Explanation:
How many valence electrons does B (boron) have?
A. 13
B. 5
C. 10
D. 3
Answer:
Boron has 3 valence electrons
6.) 50.0 mol H2O
? molecules
3.01 × 10²⁵ molecules H₂O
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
50.0 mol H₂O
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]\displaystyle 50.0 \ mol \ H_2O(\frac{6.022 \cdot 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O} )[/tex] = 3.011 × 10²⁵ molecules H₂O
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
3.011 × 10²⁵ molecules H₂O ≈ 3.01 × 10²⁵ molecules H₂O
The reaction for the decomposition of dinitrogen monoxide gas to form an oxygen radical is: N2O(g) -> N2(g) + O(g). If the activation energy is 250kJ/mol and the frequency factor is 8.0 x 10^11 /s, what is the rate constant for the first-order reaction at 1000K?
Answer:
0.0698
Explanation:
k = Ae^-Ea/RT
A= frequency factor = 8.0 x 10^11 /s
Ea = activation energy= 250 * 10^3J/mol
R= 8.314 J/mol/K
T = 1000K
Substituting values;
k = 8.0 x 10^11 * e^-250 * 10^3/ 8.314 * 1000
k = 0.0698
Conduction, convection and radiation can occur in variety of ways. Give another example, like the campfire picture above, where you have seen all three methods
Answer:
13
Explanation:
It shows the answer in the text.
3.Write the chemical equation for the reaction when methane burns in (2)
(a) Sufficient supply of oxygen
(b) Insufficient supply of oxygen
Answer:
a)CH4 + O2 = CO2 + H2O
b)4CH4+5O=2CO+8H2O+2C
My Teacher didn't teach us this please help
Answer:
first; why is it a question if teacher never teached you it LOL anyways..
Explanation:
i would say its the second one
"The smae quality of each element is present on both sides of the equation."
4. Give examples of organisms that can perform cellular respiration.
only eukaryotes can perform cellular respiration. More specifically, the two types of organisms that can do this are autotrophs and heterotrophs.
Examples of heterotrophs: animals, fungi, the majority of bacteria, ...
Examples of autotrophs: grass, algae, a few bacteria, ...
Without completing the calculations, determine what the new pressure will be in the problem below. Also,
explain how you were able to determine the new pressure without completing the calculations. Pay special
attention to how the temperature is changing in the problem.
A sample of ozone (0:2) is stored at x kelvin and 12.5 Pa. If the temperature is doubled to 2x kelvin,
what will the new
pressure be?
The new pressure will be doubled
Further explanationGiven
A sample of ozone (O₃) at x K and 12.5 Pa. (T₁= x K, P₁=12.5 Pa)
the temperature is doubled to 2x K (T₂=2x)
Required
the new pressure
Solution
Gay Lussac's Law
When the volume is not changed, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
Input the value :
[tex]\tt \dfrac{12.5}{x}=\dfrac{P_2}{2x}\\\\P_2=\dfrac{12.5\times 2x}{x}[/tex]
What is a condensation reaction, what is a hydrolysis reaction, and how do they differ?
Answer:
A condensation reaction is a class of organic addition reaction that typically proceeds in a step-wise fashion to produce the addition product, usually in equilibrium, and a water molecule.Hydrolysis is any chemical reaction in which a molecule of water ruptures one or more chemical bonds.
Different:
A condensation reaction that occurs between two separate molecules is called intermolecular condensation. ... The opposite of a condensation reaction that releases a water molecule is called a hydrolysis reaction. This happens when one molecule is split into two via the addition of a water molecule.
Explain what happens to the temperature of an ice cube as it melts.
Answer:
the temperature of the ice cube makes it gets warmer
Please help me!
Will give the brainliest!
Please answer correctly.
Really urgent!!
Explanation:
1,a: I) group 2 = strontium
ii) chlorine
iii) nitrogen
B) i) strontium outer shell=2
ii)nitrogen:outer shell=5
iii) chlorine=7
C)metal
strontium
nickel
molybdenum
cesium
tin
non metal:..
chlorine
nitrogen
neon
What are the predominant intermolecular forces in: Kr, CBr4, NaF, CH3OH, and ruby? Then rank by increasing boiling point.
Answer:
Kr- dispersion forces
CBr4- dispersion forces
CH3OH - dispersion forces, dipole interaction, hydrogen bonding
NaF- ionic
Kr-<CBr4<CH3OH<NaF
Explanation:
The magnitude of intermolecular forces influences the boiling points of substances. The stronger the intermolecular forces the higher the boiling point.
The strongest intermolecular forces here is the Ionic bond hence it accounts for the highest boiling point followed by CH3OH having hydrogen bonding.
Though Krypton and CBr4 both have dipole interaction, the higher relative molecular mass of CBr4 makes it to have a higher boiling point than Kr
What will occur when the following chemical reaction reaches dynamic equilibrium? 3H2 + N2 3 2NH3 O A. No further chemical reactions will occur in either direction. B. The concentrations of all reactants and products will be the same C. The product will form at the same rate at which it decomposes. D. The concentrations will continue to change gradually over time.
Answer:
The product will form at the same rate at which it decomposes.
Explanation:
hope it helps
Answer: The product will form at the same rate at which it decomposes.
Explanation: I took the test
which of the following keeps satellite in orbit
Answer:
Gravity
Explanation:
Without gravity it would just float in space.
Please mark brainliest, i need two more to achieve expert
Find the molar enthalpy of formation for paraffin wax (C2H526)) given the following reaction
C2H526) + 38 026) ► → 25 CO26) + 26 H,O)
A H = -14 800 kJ
Answer: The molar enthalpy of formation for paraffin wax is -2460.5 kJ
Explanation:
The balanced chemical reaction is,
[tex]C_{25}H_{52}(g)+38O_2(g)\rightarrow 25CO_2(g)+26H_2O(g)[/tex]
The expression for enthalpy change is,
[tex]\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)][/tex]
[tex]\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{C_{25}H_{52}}\times \Delta H_{C_{25}H_{52}})][/tex]
where,
n = number of moles
[tex]\Delta H_{O_2}=0[/tex] (as heat of formation of substances in their standard state is zero
Now put all the given values in this expression, we get
[tex]-14800=[(25\times -393.5)+(26\times -285.5)]-[(38\times 0)+(1\times \Delta H_{C_{25}H_{52}})][/tex]
[tex]\Delta H_{C_{25}H_{52}}=-2460.5kJ/mol[/tex]
Therefore, the molar enthalpy of formation for paraffin wax is -2460.5 kJ
A sample of methane occupies a volume of 370.0 ml at 25 oC and exerts a pressure of 1020 mm Hg. If the volume is allowed to expand to 510.0 ml at temperature of 300 K, What will be the pressure?
Answer:
744.9 mmHg ≅ 745 mmHg
Explanation:
The base to solve this, is the Ideal Gases Law. The mentioned formula is:
P . V = n . R . T
To compare two situations, we can propose:
For the first situation P₁ . V₁ = n₁. R . T₁
For the second situation P₂ . V₂ = n₂ . R . T₂
As the sample has the same moles and R is a constant value, we can avoid them so: (P₁ . V₁) / T₁ = (P₂ . V₂) / T₂
We need to make Tº unit conversion:
25ºC + 273 = 298K
We replace data → (370 mL . 1020 mmHg) / 298K = (P . 510 mL) / 300 K
(377400 mL.mmHg / 298K) . 300 K = P . 510 mL
379932.8 mL . mmHg = P . 510 mL
(379932.8 mL . mmHg) / 510 mL = P → 744.9 mmHg
Which of the following measurements are recorded to three significant figures?
Select one or more:
a)0.003 L
b)140 g
c)1,610 s
d)0.0890 m
Answer:
c) 1610 s
d) 0.0890 m
Explanation:
Significant figures:
The given measurement have four significant figures 1234.
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side when decimal point is present e.g 2400. are also significant. There are four significant figures are present.
a) 0.003 L
This measurement have 1 significant figure which is 3.
b) 140 g
This measurement have 3 significant figure 1, 4. In this measurement 0 is trailing zero that's why it is not consider significant.
c) 1610 s
This measurement have 3 significant figures 1, 6, 1.
d) 0.0890 m
This measurement have 3 significant figures 8,9 and 0
Round off 808.57 to 4 significant figures.
Answer:
808.6
Explanation:
If you keep heating a liquid, what happens to the energy of the particles in the liquid?
Answer:
theres gonna be more energy and some of the particles with a lot of energy will become vapor and evaporate
Explanation:
"If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapor as it gets warmer. Liquids evaporate faster as they heat up and more particles have enough energy to break away."
does the coefficient of linear expansion depend on length?l
Answer:
no
it doesnot beacuse it is independent of it's original length......
I DoNt CaRe....
BlA BlA BlA BlA
Answer?
Y r u singing?!?
Answer:OKEI
Explanation:im sorry for hatin but hatins what i do.i really need ma points so i can be respected more than u
What effect does mass have on force and acceleration?
Answer:
___________________________________________________________
The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
___________________________________________________________
A light year is a measure of
O length
O speed
O time
O volume
Answer:
length
Explanation:
It's the distance covered by light in one year.
is Si2Br6 an ionic, polar covalent, or non-polar covalent bond?
Answer:
non-polar covalent bond
The covalent bonds form silicon dibromide, or [tex]Si_2Br_6[/tex]. Instead of being an ionic compound, it is a covalent one.
The sharing of electrons between the silicon (Si) and bromine (Br) atoms in [tex]Si_2Br_6[/tex] provides the basis for their bonding. Covalent bonds are formed when atoms share electrons to form a stable electron configuration. In this example a total of twelve electrons are shared between each of the silicon atoms and six of the bromine atoms. By filling their valence electron shells, this electron sharing enables silicon and bromine to have more stable structures.
Learn more about electrons, here:
https://brainly.com/question/12001116
#SPJ6
_____has particles with the greatest average kinetic energy
a
Ice water
b
Hot water
c
Warm water
d
Room temperature water
Answer:
c warm water
Explanation:
Kinetic energy is related to temperature. The molecules in a glass of warm water have more kinetic energy (they move faster – see Racing Molecules) than the molecules in a glass of cold water. The temperature of a substance is the average* amount of kinetic energy its molecules have.
Answer:
hot water
Explanation:
Some characteristics of each of the four states of matter are given in the table below.
States of Matter
State Space Between Particles Speed of Particles
1 High High
2 High High
3 Very Low Least
4 Low Medium
Which state of matter does State 3 represent?
Gas
Liquid
Solid
Plasma
Answer:
YOUR ANSWER IS SOLID
EXPLANATION:
Which statement is true about oxygen -17 and oxygen-18, A they do not have the same number of protons. B there atoms have a identical mass. C they are isotopes of oxygen. D they have the same mass number .