(04.01 LC)
Fill in the blank with the correct number to balance the equation: __KCIO3 - 2KCI +
302. (Enter only a whole number.) (3 points)
If 30cm³ of 0.45 mol dm3 HCl reacted with NaOH, how many moles of HCl reacted?
Moles HCl reacted : 0.0135
Further explanationMolarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large {\boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
So to find the number of moles can be expressed as
n = V x M
The volume of HCl 30 cm³=3.10⁻² dm³
Molarity of HCl = 0.45 mol/dm³
so moles HCl reacted :
[tex]\tt n=3.10^{-2}\times 0.45=0.0135[/tex]
A balloon filled with helium floats in the air. What does this tell you about the density of helium?
Answer:
helium is denser than air
Answer:
For air, which has a molar mass of 29.0 g/mol, this gives a density of 1.18 g/l. Helium, which has a mass of 4.00 g/mol, has a density of 0.164 g/l.
please help it’s due today
please help me its due today thanks :D
Answer:
true
Explanation:
Answer: true
Explanation: it absorbs heatt
Water vapor particles are most likely to phase change into liquid particles If the vapor particles come into contact with:
a cold surface
Ono surface
a warm surface
O any surface at all - the temperature of the surface does not matter
Answer:
A cold surface I think.
Explanation:
5 points
An atom has a mass number of 65. Its number of
neutrons is the sum of its atomic number and 3. How
many protons, neutrons, and electrons does this atom
have? What is the identity of this atom? *
(justify your answer step by step!)
Answer:
25 protons, 25 electrons, 30 neutrons. ......... manganese is the identity
Explanation;
x = atomic number -# of protons
The number of neutrons = x + 5
The mass number (sum of protons + neutrons) = 55.
x + (x + 5) = 55
2x + 5 = 55
2x = 50
x = 25; atomic number 25 = manganese (Mn)
so ;
25 = Protons
30=Neutrons
25=Electrons
Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different?
kinds of cations.
kinds of atoms.
b. kinds of anions.
d. molecular formulas.
Explanation:
molecular formula
....
Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas. Therefore, option D is correct.
What is Chemical formula ?A chemical formula lists the elements that comprise the compound as well as the number of atoms of each element in the compound's smallest unit, whether a molecule or a formula unit. Knowing the elements' names and a few basic rules allows us to name simple compounds given a chemical formula.
Chemical formulas are classified into three types: empirical, molecular, and structural.
Empirical formulas depict the simplest whole-number ratio of atoms in a compound, whereas molecular formulas depict the number of each type of atom in a molecule and structural formulas depict how the atoms in a molecule are bonded to each other.
Thus, Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas, option D is correct.
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How do you identify an element?
Answer:
element is the smallest particles which cannot be broken down.
Brass and bronze are both of copper because copper is the component in brass and bronze.
Answer:1 alloys 2 main
Explanation: Brass and bronze are both constructed from copper because copper is the main component in brass
Which orbital diagram is the most stable?
A. 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑
B. 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ 3s ↑↓ 3p ↑↓ ↑↓ ↑↓ 4s ↑↓ 3d ↑ ↑ ↑ ↑ ↑
C. 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ 3s ↑↓ 3p ↑ ↑ ↑
D. 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓
E. 1s ↑↓ 2s ↑ 2p 3s 3p ↑
F. 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ ↑↓ 3s ↑↓ 3p ↑↓ ↑ ↑
Answer:
D
Explanation:
Because sub-shell p have maximum no. of electrons I. E. 6
What is the ionic charge of elements in column 1?
Every element in the first column varieties a cation with charge 1+. Every component in the 2d column varieties a cation with charge 2+. Elements in the third to remaining column nearly all shape an anion with a 2- charge and factors dwelling in the 2d to closing column nearly all structure anions with a 1- charge.
9. 1.2 x 102 yd =
10. 1535 fl. oz. =
L
Answer:
9. 122.4 yards
10. 45.395 litres
PLEASE HELP WITH THESE TWO QUESTIONS
2.) 50.0 grams of water at 100 degrees Celsius evaporated to water vapor 2 points
at 100 degrees Celsius. Calculate the amount of heat required for this
conversion.
2. A student measured 15.0 grams of ice in a beaker. The beaker was then
placed on a hot plate where it was heated uniformly for a certain amount
of time. During the melting process of the ice, the student noted that the
temperature was at 0 degree Celsius. When all the ice converted to water,
the final temperature was also at 0 degree Celsius. How much heat was
used to melt the ice?
1. Q=112.8 kJ
2. Q=5.01 kJ
Further explanationThe heat required for phase change :
melting/freezing :Q = mLf
Lf=latent heat of fusion
vaporization/condensationQ = mLv
Lv=latent heat of vaporization
1.
m=50 g=0.05 kg
Lv (water) = 2256 kJ/kg
[tex]\tt Q=0.05\times 2256=112.8~kJ[/tex]
2.
m=15 g=0.015 kg
Lf for water = 334 kj/kg
[tex]\tt Q=0.015\times 334=5.01~kJ[/tex]
What causes metamorphic rocks to form from existing rocks?
O magma and minerals
O heat and pressure
O exposure to Earth's mantle
exposure
to Earth's surface
I think it's Heat and pressure
Answer:
heat and pressure did on edge
Explanation:
Objects with more (less or more) molecules have
heat energy than objects with (greater or fewer)
molecules? fill in the blanks
how to write the ionic formula for the K1+, MnO41- pair of ions
Answer:
Ionic formula: KMnO4
Explanation:
Pottasium permanganate (KMnO4) is an ionic compound that contains a combination of pottasium cations (K+) and permanganate anion (MnO4-). The pair of ions that make up the ionic compound cancel out each other to make it neutral.
K+ (aq) + MnO4- (aq) → KMnO4 (aq)
MnO4- contains 1 atom of manganese with a (+7) charge and four atoms of oxygen with a (-2) charge each. This forms a +7 for Mn and -8 for O4, hence, a net total of -1.
Express the measurement using the appropriate SI prefix. 2.50 x 10-3g
If you want to warm 3.10 g of water from 56.4 C to 82.4 C, how many calories would you need to add to the water?
Answer: 80.6
Explanation:
q = mcAt
we have the grams of water, temp change, and specific heat of water is 4.186 J/g so we can plug in our numbers to find the heat energy in joules
q = (3.10)(4.184)(82.4-56.4)
q= 337.2304 J
we need our answer to be in calories so divide our answer by 4.184 and we get 80.6 calories
The amount of calorie required to warm 3.10 g of water from 56.4°C to 82.4°C is 80.6 calories.
HOW TO CALCULATE CALORIES:
The amount of calories can be calculated by using the formula as follows:Q = m × c × ∆T
Where:
Q = amount of heat in caloriesc = specific heat capacity (J/g°C)∆T = change in temperature (°C)m = mass (g)According to this question, c = 4.184J/g°C, m = 3.10g, ∆T = 82.4°C - 56.4°C = 26°CQ = 3.10 × 4.184 × 26Q = 337.23JSince 1J = 0.2390057361 calories337.23 J = 80.6calories.Therefore, amount of calorie required to warm 3.10 g of water from 56.4°C to 82.4°C is 80.6 calories.Learn more at: https://brainly.com/question/8097823?referrer=searchResults
Give two properties that glass and plastic sometimes share.
Answer:
Wall, cup, mug, plastic spoon
Explanation:
Because all of those are glass and it is important to us to make sure that if you are touching this brle careful
Answer:
Example aflask that is made in plastic,a plastic jag
Explanation:
they share some of the things in common such us
1.the height
2. the density
What is the frequency for a wave with a wavelength of 6.3x10^5
Answer:630000x
Explanation:
6.3x×100000
What is a chemical reaction
69. Sequencing Arrange these hydrates in order of
increasing percent water content: MgSO;-7H.O.
Ba(OH)2-8H.O. COC1, 6H2O.
In order of increasing percent water content:CoCl₂.6H₂O, Ba(OH)₂.8H₂O, MgSO₄.7H₂O
Further explanation[tex]\tt \%element=\dfrac{Ar~element}{MW~compound}\times 100\%[/tex]
CoCl₂.6H₂O.MW=237.90 g/mol
6H₂O MW = 6.18=108 g/mol
[tex]\tt \%H_2O=\dfrac{108}{237.9}\times 100\%=45.4\%[/tex]
MgSO₄.7H₂O.MW=246.48 g/mol
MW 7H₂O = 7.18=126 g/mol
[tex]\tt \%H_2O=\dfrac{126}{246.48}\times 100\%=51.1\%[/tex]
Ba(OH)₂.8H₂O MW=315.48 g/mol
MW 8H₂O = 8.18=144 g/mol
[tex]\tt \%H_2O=\dfrac{144}{315.48}\times 100\%=45.6\%[/tex]
When an aluminum atom becomes an ion, what is its charge?
Answer:
Initially, the aluminum atom had a charge of +13 + (−13) = 0; in other words, its charge was neutral due to the equal numbers of protons and electrons. When it becomes an ion, it loses 3 electrons, leaving behind only 10. Now the charge is +13 + (−10) = +3.
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How many moles of Oxygen are in 1 mile of CaCo3?
[tex]\huge\boxed{3moles}[/tex]
_____________________________________Compound:The compound given in the question is [tex]CaCO_{3}[/tex] which is called Calcium Carbonate. A 1 mole of Calcium Carbonate has,
1 Moles of Calcium.
1 Moles of Carbon.
3 Moles of Oxygen.
_____________________________________Question:In the Question, It is asked that how many moles are present in the 1 mole of Calcium Carbonate, So as per information we have, there are 3 moles of oxygen present in Calcium Carbonate.
__________________________________________________________
Much simpler way to understand why there are 3 mole is look at the subscript along the element. There is no number in the subscript of Calcium and Carbon thus 1 Mole, There is 3 present in the subscript thus 3 moles of calcium. Remember that subscript suggests the number of moles of an element in only 1 MOLE OF COMPOUND
_____________________________________Best Regards,'Borz'
(URGENT!!!!!) the electron configuration of some elements are given. Based on the electron configuration which ELEMENTS can likely form ions with multiple charges?
a) zinc [Ar] 3d¹⁰4s²
b) iron [Ar] 3d⁶4s²
c) sodium [Ne] 3s¹
d) cobalt [Ar] 3d⁷ 4s²
e) silver [Kr] 4d¹⁰ 5s¹
Answer:
iron (Ar) 3d^6 4s^2 and cobalt (Ar) 3d^7 4s^2
Based on the electron configuration of elements Fe and Co can likely form ions with multiple charges.
What is electron configuration?Electron configuration of an element describes how electrons are distributed in its atomic orbitals. Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.
Electron configuration can be written according to the following rules-
1. Aufbau Principle
2. Pauli's exclusion principle
3. Hund's rule
Electrons will be filled according to the increasing order of the energy as per the n+l rule.
Given,
a) zinc [Ar] 3d¹⁰4s²
b) iron [Ar] 3d⁶4s²
c) sodium [Ne] 3s¹
d) cobalt [Ar] 3d⁷ 4s²
e) silver [Kr] 4d¹⁰ 5s¹
Except Co and Fe, all the elements when loose 1 or 2 electrons form full filled electrons, Fe and Co show +2, +3, +4 etc oxidation states.
Therefore, Based on the electron configuration of elements Fe and Co can likely form ions with multiple charges.
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If the pressure on the surface of water in the liquid state is
40 kpa, the water will boil at?
Answer:
sdfs
Explanation:
dfsdfsdfs
the average kinetic energy of particles of matter id called?
Answer:
Temperature is a measure of the average kinetic energy of the particles in a substance.
Sunlight heating the sand on the beach on a hot summer day is an example of
a. conduction
b. convection
c. radiation
d. none of these
Answer:
c
Explanation:
Sunlight heating the sand on the beach on a hot summer day is an example of radiation which is electromagnetic radiation.
What is electromagnetic radiation?
The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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How could you explain why soap is able to clean the oil and dirt off your bodies?
Answer:
When you wash your hands with soap, it dislodges the dirt, grease, oils, and disease-ridden fecal matter particles on your hands by creating these micelles. Surrounded by the soap, the oil molecules become suspended and distributed in the water rather than stubbornly clinging to your skin.
Explanation: