Answer:
ok
Explanation:
. Do the Lanthanoid and Actinoid families have specific group numbers?
Answer:
No they do not
Explanation:
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.
PLEASE HELP ASAP I LOVE YOU I'LL GIVE BRAINLY
Answer:
I think B. force create matter is right one
Answer:
the answer is c
Explanation:
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, ...
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
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
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What volume (in liters) does 3.91
moles of nitrogen gas at 5.35 atm
and 323 K occupy
atoms or helium nickel would represent _____
Answer:
they represent their own atoms
Answer:
Elements
Explanation:
Combine Lead (II) nitrate with Potassium Iodide solution
Answer:
When you add lead nitrate to potassium iodide, their particles combine and create two new compounds, a yellow solid called lead iodide (Pbl2) and a white solid called potassium nitrate (KNO3). Yellow clouds indicate that the chemical change has taken place.
Hope it will help you........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."
If a 12 mg metal ring is heated using 30.0 calories, it’s temperature rises 1.9 degrees Celsius. Calculate the specific heat of the ring
Answer:
c = 5505263.16 J/g.°C
Explanation:
Given data:
Mass of ring = 12 mg (12/1000 = 0.012 g)
Calories used = 30.0 cal (30.0 ×4184 = 125520 J)
Temperature increases = 1.9°C
Specific heat of ring = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
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
125520 J = 0.012 g×c ×1.9°C
125520 J = 0.0228 g.°C ×c
c = 125520 J / 0.0228 g.°C
c = 5505263.16 J/g.°C
what is preferential discharge of ions
Answer:
During the process of electrolysis, ions that are formed will get discharged to reform neutral atoms at the state of electrons, whereas the preferential meaning which in case one or more kind of cations and anions in the electrolyte, the one with the higher concentration or at a lower position activity will get discharged first.
does the coefficient of linear expansion depend on length?l
Answer:
no
it doesnot beacuse it is independent of it's original length......
How much water would you need to add to 500 mL of a 2.4 M KCl solution to make a 1.0 M solution?
Answer:
Use dilution equation:
M1V1 = M2V2
1.0*V1 = 2.4*500
V1 = 1200mL
You already have 500mL KCl solution . You must add: 1200mL - 500mL = 700mL water.
Explanation:
Hope this helps!!! <3
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.
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.
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 .
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:
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
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
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
why does a freely suspended iron rod does not point at N-S directions always
Answer:
This is because their is a repulsive force between the magnetic north and the geographical north since the rod experiences the Earth's magnetic field.
The iron rod deflects at an angle (angle of dip) from the horizontal.
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
Equations can be balanced by using the half-reaction method. Which step should be completed first when using this method?
Answer:
Separate the reaction into half equations
Explanation:
When we want to balance redox equations, we must take cognizance of the fact that a specie was oxidized and another specie was reduced.
Hence we must identify the specie that was oxidized and the one that was reduced and then break up the whole redox reaction into oxidation and reduction half equations.
Answer:
D. finding the oxidation states of atoms
Explanation:
i did the review on edge2020
HELPP ASAP PLEASE SEE IMAGES
Answer:
1st paragraph:
1.compound 2.physical 3.elements 4.water 5. gas 6.white 7. season 8.ratio 9.formula 10.elements 11.atoms 12.subscript 13.one
2nd paragraph
1.stable 2.many/reactive 3.eight 4.helium 5.seven 6.outer 7.one 8.level 9. compounds 10.reactive 11. seven 12. Eight 13.lose 14.gain 15. Share 16.compounds 17. atoms
Explanation:
I just did the 1st page. Gimme a min and I'll do the second.
Please Help!!!!
As the mass of a star increases, how do you think its luminosity might change?
Answer: Answer in explanation
Explanation:
If you're talking about *stars* in general, as mass increases, so does the luminosity - it burns brighter and faster. A *star* will not increase it's mass generally, unless something falls into it; and generally - even if a *planet* falls into a star (take our sun, for example - you could plunge the Earth into the sun, and you've only increased the sun's mass by 1/1,300,000th... )
As radius increases, for example, when our sun slips into the Red Giant phase, it will become redder, but the surface will have increased 100,000 times - so, the amount of light it puts out now from a square meter, compared to how much it will put out when it's a red giant will be reduced 20 fold; however, there's so much ***more*** area, that the overall brightness of our sun will increase dramatically.
Answer:nut
Explanation:bust
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
Explain what happens to the temperature of an ice cube as it melts.
Answer:
the temperature of the ice cube makes it gets warmer
How many valence electrons does B (boron) have?
A. 13
B. 5
C. 10
D. 3
Answer:
Boron has 3 valence electrons
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