Answer: no
The moon orbits the Earth, and the Earth orbits the Sun, so we do not see the same part of the moon. We always see different parts of it.
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Two highly reactive elements in period 2 are the metal lithium and the.
The two highly reactive elements in period 2 are the metal lithium (Li) and the nonmetal fluorine (F).
A period on the periodic table represents a horizontal row of elements.
In the second period, there are two alkali metals (lithium and sodium), two nonmetals (boron and carbon), a metalloid (boron), and three noble gases (helium, neon, and argon).
Lithium (Li) is a soft, silvery-white alkali metal, belonging to Group 1 elements. It is the lightest metal and has the lowest density among all solid elements under standard conditions.
Lithium is highly reactive and flammable, necessitating storage in mineral oil or an inert atmosphere to prevent reactions with air or water.
Fluorine (F), with the chemical symbol F, is the lightest halogen and a highly reactive nonmetal belonging to Group 17 elements.
It exists as a pale yellow gas with a pungent odor. Fluorine exhibits high reactivity and readily reacts with nearly all other elements, except for helium and neon.
It is not found free in nature and is obtained through the electrolysis of hydrogen fluoride.
Lithium and fluorine are the two highly reactive elements in period 2 of the periodic table. Lithium is a soft alkali metal, while fluorine is a nonmetal with a high reactivity.
Their distinct properties and reactivities contribute to their significance in chemical reactions and their placement in their respective groups on the periodic table.
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Strontium-90 has a half-life of 28.8 years. If you start with a 10-gram sample of strontium-90, how much will be left after 115.2 years? Justify your answer.
which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect?
Answer:
Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect? Energy of electrons depends on light's frequency, not intensity. A change in which property of light will have no effect on whether or not the photoelectric effect occurs?
Explanation:
Why can't a cell stop normal processes during interphase
an exothermic reaction takes place. which is true of the entropy of the surroundings? group of answer choices it remains constant it decreases it increases insufficient information
The entropy of the surrounding when an exothermic reaction takes place increases.
What is an Exothermic Reaction?A reaction is defined as exothermic if the overall standard enthalpy change (H) is negative. Exothermic processes typically releases heat.
Example of Exothermic reaction:
CaO+H2O Ca(OH)3 + Heat
What is entropy?Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.
Now you know as in exothermic reaction heat is given to the surrounding hence more heat is added to the surrounding which results in the rising of entropy of the surrounding.
Hence, the entropy of the surrounding when an exothermic reaction takes place increases.
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Maggie is sitting at a table wit Fred and Florence.Maggie has 10 markers but Fred and Florence each have only 7 markers.how can they share markers so each has 8
Answer:
Give them each one so all of you is 8
Explanation:
I hope it helps:)
Fred and Florence have a combined total of 14 markers. Meaning, the amount of markers between all three is 24. If Maggie gives one marker to Fred and one marker to Florence, then each of them will have 8 markers.
A gas has a pressure of 7.01 atm at 227°C. What will its temperature be if the pressure is increased to 12.1 atm and volume is held constant?
Answer:
The temperature of the gas will be 590.05 C.
Explanation:
Gay-Lussac's law can be expressed mathematically as follows:
\(\frac{P}{T} =k\)
Where P= Pressure, T = temperature, K = Constant
This law indicates that the ratio between pressure and temperature is constant.
This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of shocks against the walls increases, that is, the pressure increases. That is, the gas pressure is directly proportional to its temperature.
In short, when there is a constant volume, as the temperature increases, the gas pressure increases. And when the temperature decreases, gas pressure decreases.
It is desired to study two different states, an initial state and an final state. You have a gas that is at a pressure P1 and at a temperature T1 at the beginning of the experiment. When the temperature varies to a new T2 value, then the pressure will change to P2, and the following will be true:
\(\frac{P1}{T1} =\frac{P2}{T2}\)
In this case:
P1= 7.01 atmT1= 227 C= 500 K (being 0 C= 273 K)P2= 12.1 atmT2= ?Replacing:
\(\frac{7.01 atm}{500 K} =\frac{12.1 atm}{T2}\)
Solving:
\(T2=12.1 atm*\frac{500 K}{7.01 atm}\)
T2= 863.05 K= 590.05 C
The temperature of the gas will be 590.05 C.
after the child exhaled all of the gas, it becomes sick
How much energy is required to vaporize 10.00 grams of water at its boiling point?
Answer:
22,600 J or 22.6 kJ
Explanation:
What is the ionic charge on the zirconium ion in zirconium oxide, ZrO2?
Answer:
Its ionic charge is 4+
Its ionic charge is 4+Zr⁴⁺ + O²⁻ ––> Zr₂O₄ ––> ZrO₂
Explanation:
I hope it will be helpful for you.
What is the resultant force of a motorcycle travelling at 500 N with an air resistance of 50 N
\(▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪\)
The resultant force is equal to :
\(500 - 50\)\(450 \: \: N\)Where do you all of the extra "stuff" in your bodies came from as you were growing ?
Answer:
from food ,cells grow ,tissue gro,organs grow body systems grow.......
In the molecule C2H4 the valence orbitals of the carbon atoms are assumed to be?
a) dsp hybridized
b) not hybridized
c) sp hybridized
d) sp^3 hybridized
e) sp^2 hybridized
In the molecule C2H4, valence orbitals of the carbon atoms are assumed to be e) sp^2 hybridized.
What is valence orbitals?The set of orbitals that can energetically accept electrons to create chemical bonds is known as the valence shell. The ns and np orbitals in the outermost electron shell make form the valence shell for main-group elements.
The outside electrons engaged in bonding are called valence electrons. A particular atom can have 0 to 7 valance electrons since valance electrons can only exist in the s and p orbitals. Noble gases are atoms that have no valence electrons and dislike forming bonds.
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Identify the fundamental particles that make up a proton.
Answer:
The three main quarks that make up a proton are two up quarks and one down quarks which is the main reason protons are positive aswell.
A 5.00 g sample of al reacts with excess h2so4. what volume of h2 gas is produced at stp
6.23L volume of h2 gas is produced at stp.
How do you calculate the H2 gas volume?Given that one mole of dihydrogen (H2) weighs 2,0159 g/mol, the experimental density of hydrogen—which is 0,0899 g/L at 0 °C and 0,0837 g/L at 20 °C—can be used to compute the exact molar volume of hydrogen.
How do you calculate the H2 gas volume at STP?This implies that at STP, one mole of hydrogen also takes up 22.4 liters of space. Therefore, at STP, 10moles of hydrogen gas will take up =22.410=224litres of space. In other words, when 460g of salt combines with extra water at STP, 224litres (or 224000mL) of hydrogen gas are released.
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the question you are looking for is
A 5.00 g sample of Al reacts with excess H2SO4. What volume of H2 gas is produced at STP?
2Al(s) + 3H2SO4(aq)→ Al2(SO4)3(aq) + 3H2 (g)
Which might cause someone to be exempt from soccer practice? *
a. an injury
b. a previous absence
Answer:
injury
Explanation:
because get hurt we can say injury
Why is the Sun's lifespan primarily based on its initial mass?
Answer:
Probably because there is more helium to burn. After billions of years there's only gonna be helium so no more of that firey energy.
I think....
What is the number of protons of oxygen
Answer:
8 protons
The number of protons tell us what type of element an atom is.
what mass of solid copper (ii) sulfate is needed to make 500.0 ml of 0.0300 m copper (ii) sulfate solution?
According to the question Therefore, you need 2.394 grams of solid copper (II) sulfate to make a 500.0 mL 0.0300 M solution.
To determine the mass of solid copper (II) sulfate needed to make 500.0 mL of 0.0300 M copper (II) sulfate solution, we need to use the formula:
M = (molarity x moles) / volume
First, let's calculate the moles of copper (II) sulfate required:
moles = M x volume = 0.0300 mol/L x 0.5000 L = 0.0150 moles
Next, we need to determine the molar mass of copper (II) sulfate, which is 159.6 g/mol.
Finally, we can calculate the mass of copper (II) sulfate required:
mass = moles x molar mass = 0.0150 moles x 159.6 g/mol = 2.39 g
Therefore, we would need 2.39 grams of solid copper (II) sulfate to make 500.0 mL of 0.0300 M copper (II) sulfate solution.
mass = moles × molar mass
First, we need to find the moles of copper (II) sulfate:
moles = concentration × volume
moles = 0.0300 M × 0.500 L (converting 500.0 mL to L)
moles = 0.0150 mol
Next, we'll find the molar mass of copper (II) sulfate (CuSO4):
Molar mass = 63.5 (Cu) + 32.1 (S) + 4 × 16.0 (O) = 159.6 g/mol
Now, we can calculate the mass:
mass = 0.0150 mol × 159.6 g/mol
mass = 2.394 g
Therefore, you need 2.394 grams of solid copper (II) sulfate to make a 500.0 mL 0.0300 M solution.
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How do you balance C4H10 + Cl2 + O2 —> CO2 + CCl4 + H2O?
Answer:
4C4HO + 4Cl2 + 13O2 → 14CO2 + 2CCl4 + 2H2O
Explanation:
Balance The Equation: C4HO + Cl2 + O2 = CO2 + CCl4 + H2O
1. Label Each Compound With a Variable
aC4HO + bCl2 + cO2 = dCO2 + fCCl4 + gH2O
2. Create a System of Equations, One Per Element
C: 4a + 0b + 0c = 1d + 1f + 0g
H: 1a + 0b + 0c = 0d + 0f + 2g
O: 1a + 0b + 2c = 2d + 0f + 1g
Cl: 0a + 2b + 0c = 0d + 4f + 0g
3. Solve For All Variables
a = 4
b = 4
c = 13
d = 14
f = 2
g = 2
4. Substitute and Verify Result
4C4HO + 4Cl2 + 13O2 = 14CO2 + 2CCl4 + 2H2O
L R
C: 16 16 ✔️
H: 4 4 ✔️
O: 30 30 ✔️
Cl: 8 8 ✔️
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a flat metal surface in an electric cell is its _________ terminal
Answer:
negative
Explanation:
How many moles of glucose C6H12O6 can react with 15.7 moles of oxygen? C6H12O6 + 6O2 -----------> 6CO2 + 6H2O
2.62 moles of glucose can react with 15.7 moles of oxygen. The balanced chemical equation for the combustion of glucose is:
C6H12O6 + 6O2 → 6CO2 + 6H2O
From the equation, we can see that for every mole of glucose that reacts, 6 moles of oxygen are required. Therefore, the number of moles of glucose that can react with 15.7 moles of oxygen can be calculated as follows:
Number of moles of glucose = (Number of moles of oxygen) / 6
Number of moles of glucose = 15.7 / 6
Number of moles of glucose = 2.62
Therefore, 2.62 moles of glucose can react with 15.7 moles of oxygen.
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What type of variable is held constant in an experiment?
Answer:
A variable in an experiment which is held constant in order to assess the relationship between multiple variables, is a control variable.
Explanation:
Which of the following are properties of ionic compounds?
A. hard solids with high melting and boiling points.
B. soft and good conductors of electricity.
C. both A and B
D. good conductors of electricity, but only when dissolved in water
Answer:a and d
Explanation:
The properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.
What are Ionic solids?Ionic solids are made up of ions joined together by ionic bonds. "Ionic bonding" is a type of chemical bond between a positive and a negatively charged ion where the transfer of electrons occurs.
They are too hard, and the ionic solids’ melting point is usually too high due to powerful forces between the anions and cations.
They are known as electrical insulators when they are in a solid-state. Apart from this, the molten salts do behave with electricity since the ions are not closed in the lattice.
Therefore, the properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.
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Briefly define correlation
Answer:
Correlation means association - more precisely it is a measure of the extent to which two variables are related. There are three possible results of a correlational study: a positive correlation, a negative correlation, and no correlation.
Explanation:
PLS MARK BRAINLIEST
Answer:
a mutual relationship or connection between two or more things.
Explanation:
"research showed a clear correlation between recession and levels of property crime"
An air plane is flying at a crusing speed of 200 miles per hour for 3 hours. How far would the plane fly?
How hot can the sun’s photosphere get?
A-15 million °C
B-46 million °C
C-1.5 million °C
D-4,600°C
Answer:a
Explanation:
Hi all,
Please can you help me fill in the blanks.
Thanks so much!
Magnesium carbonate + hydrochloric acid ________+ _______+ magnesium chloride.
Answer:
yields Carbon Dioxide and Water
Explanation:
Draw the Lewis structure of Asoshowing 2 one pairs Identify the molecular geometry of AsO trigonal planar Rings More Draw Erase see-saw square planar 0 O trigonal bipyramidal linear 0 tetrahedral As square pyramidal octahedral O bent OT-shaped O trigonal pyramidal 0: : 0 What are the approximate bond angles in AsO? What is the hybridization of the central As atom? 120 O 109.5。 90° O 180° O sp2 An AsO ion is 0 nonpolar Opolar.
The Lewis structure of AsO showing 2 lone pairs is as follows:
O
As
/
X X (where X represents a lone pair)
The molecular geometry of AsO is trigonal planar. The central As atom is hybridized with sp2 hybridization. The approximate bond angles in AsO are 120 degrees. The AsO ion is polar.
A Lewis structure, also known as a Lewis dot diagram, is a way to represent the chemical bonding in a molecule. It uses dots (also called electron dots or Lewis dots) to show the valence electrons on an atom, and lines to show the bonds between atoms. The goal of drawing a Lewis structure is to use the valence electrons of the atoms in a molecule to form the most stable arrangement of atoms, that is to say, to achieve the octet rule where each atom has 8 valence electrons in its outermost shell.
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In the reaction of solid magnesium with atmospheric nitrogen to produce solid magnesium nitride, what are the coefficients of the balanced equation, written as stated?.
The coefficients of the balanced chemical reaction of solid magnesium with atmospheric nitrogen to produce solid magnesium nitride are ( 3 , 1 , 1 ) .
The balanced chemical reaction of solid magnesium with atmospheric nitrogen to produce solid magnesium nitride is mentioned below:
3 Mg (s) + \(N_{2}\) (g) → \(Mg_{3} N_{2}\) (s)
We were asked to identify the coefficients of the balanced chemical equation of the reaction of solid magnesium with atmospheric nitrogen to produce solid magnesium nitride.
From the above mentioned equation, we can write
coefficients of Mg = 3
coefficients of \(N_{2}\) (g) = 1
coefficients of \(Mg_{3} N_{2}\) (s) = 1
3 , 1 , 1 are the coefficients of balanced chemical equation.
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