Answer: Valence electron
Explanation:
The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
Can you please help me(50 points)
Answer:
P=15
N=59
Explanation:
If the bottom number is 74 (pic is blurry)
Math
John can reach 60 centimeters above the top of his head. If John is 2 meters tall,
how high can he reach?
centimeters
John can reach 60 centimeters above the top of his head. If John is 2 meters tall, how high can he reach ?
ANSWER: 260#CARRY ON LEARNING
study well ~
1 point
7.' What type of chemical reaction is this? *
Hgo
Hg
+
O2
Mark only one oval.
Synthesis
Decomposition
Single Replacement
Double Replacement
Answer:
Decomposition reaction
A sample of substance X that has a mass of 326. 0 g releases 4325. 8 cal when it freezes at its freezing point. If substance X has a molar mass of 58. 45 g/mol, what is the molar heat of fusion for substance X? Use q equals n delta H. 13. 31 cal/mol 74. 00 cal/mol 775. 6 cal/mol 19054. 7 cal/mol.
The molar heat of fusion of X has been 775.6 cal/mol. Thus, option C is correct.
The molar heat of fusion has been defined as the energy absorbed or released by a mole of substance in converting between solid and liquid state.
Computation for the molar heat of fusionThe given mass of substance X has been, 326 g.
The molar mass of substance X has been 58.45 g/mol.
The moles of sample have been given as:
[tex]\rm Moles=\dfrac{Mass}{Molar\;mass}\\\\ Moles\;X=\dfrac{326\;g}{58.45\;g/mol}\\\\ Moles\;X=5.58\;mol[/tex]
Thus, the amount of heat absorbed by 5.58 mol of sample has been 4325.8 cal.
The amount of heat absorbed by a mole of sample has been:
[tex]\rm 5.58\;mol=4325.8\;cal\\\\1\;mol=\dfrac{4325.8\;cal}{5.58\mol} \\\\1\;mol=775.6\;cal/mol[/tex]
The amount of heat absorbed by a mole of sample in meting has been the molar heat of fusion.
Thus, the molar heat of fusion of X has been 775.6 cal/mol. Thus, option C is correct.
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Why is climate change damaging to the tundra? (Select all that apply.)
A. Producers that grow in colder temperatures would be less available to the consumers that eat them.
B. Perma frost would melt, causing a release of methane gas.
C. Plants and animals from colder ecosystems would begin to move into the tundra.
D. The active soil would freeze up causing plants to die.
Answer:
A & B hope this help
Explanation:
Compare the electronegativities of metals and non-metals What patterns do you see?
Answer:
Consequently, the electronegativities of metals are generally low. Nonmetals have more valence electrons and increase their stability by gaining electrons to become anions. The electronegativities of nonmetals are generally high.
Explanation:
I don't know if it's okay
How many atoms are in a molecule of C2H4O2, acetic acid?
a.
8
b.
9
c.
7
d.
3
How does the number of groups help define the Molecular Geometry?
Answer:
counting the number of “groups” of electrons around the atom
Explanation:
=>
How many grams of CaCl2 are needed to produce 10.0 grams of NaCl?
3 CaCl2 + 2 Na3PO4 → Ca3(PO4)2 + 6 NaCl
_ grams of CaCl2 (round to 3 sig figs)
a) 9.50
b) 12.4
c) 534
d) 6.89
9.55 grams of CaCl2 are needed to produce 10.0 grams of NaCl.
HOW TO CALCULATE MASS IN STOICHIOMETRY:The mass of a compound in a balanced reaction can be calculated as follows:
3CaCl2 + 2Na3PO4 → Ca3(PO4)2 + 6NaCl
Based on the above equation, 3 moles of CaCl2 produces 6 moles of NaCl.
Moles of NaCl = 10g ÷ 58.5g/mol = 0.171mol
0.171 mol of NaCl will be produced by (0.171 × 3/6) = 0.086mol of CaCl2.
Mass of CaCl2 = 111g/mol × 0.086mol
Mass of CaCl2 = 9.55g
Therefore, 9.55 grams of CaCl2 are needed to produce 10.0 grams of NaCl.
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Cl2 +2e- —> 2Cl-
if you’re adding 2 electrons to the Cl2, why is it still Cl- and not just Cl?
When two electrons are added to chlorine has, Cl2, each atom of Cl will receive one electron. Hence, the atoms becomes ions having a negative charge, Cl-
IonsIons are atoms or group of atoms possessing an electrical charge which may be positive or negative.
Negatively charged ions are formed when atoms accept or gain electrons. The negative charge is because there are more electrons than protons in the atom.
Negatively charged ions are usually formed by non-metals. For example, chlorine gas accepts two electrons to become 2 Cl-
Cl2 + 2e- ----> 2 Cl-
Therefore, when two electrons are added to chlorine has, Cl2, each atom of Cl will receive one electron. Hence, the atoms becomes ions having a negative charge, Cl-
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What is magnetism? Explain in detail.
Answer:
Magnetism is the force exerted by magnets when they attract or repeal each other .Magnetism is caused by the motion of electric charges. ... To become magnetized, another strongly magnetic substance must enter the magnetic field of an existing magnet. The magnetic field is the area around a magnet that has magnetic force.
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A mole(6.02214076×10^23) of blue whales(320,000 lbs) weighs how much more than the moon? (7.35 x 10^22 kg)
Answer:
Multiply the first 2 numbers on your calculator and convert it to kg by dividing by 2.205.
Then, subtract the mass of the moon from this number.
Explanation:
Determine the mass in grams of each element.
1.33 × 1022 mol of Sb
4.75 × 1014 mol of Pt
1.22 × 1023 mol of Ag
9.85 × 1024 mol of Cr
1. The mass of 1.33×10²² mole of Sb is 1.62×10²⁴ g
2. The mass of 4.75×10¹⁴ mole of Pt is 9.26×10¹⁶ g
3. The mass of 1.22×10²³ mole of Ag is 1.32×10²⁵ g
4. The mass of 9.85×10²⁴ mole of Cr is 5.12×10²⁶ g
1. Determination of the mass of 1.33×10²² mole of SbMole of Sb = 1.33×10²² moleMolar mass of Sb = 122 g/molMass of Sb =?Mass = mole × molar mass
Mass of Sb = 1.33×10²² × 122
Mass of Sb = 1.62×10²⁴ g
2. Determination of the mass of 4.75×10¹⁴ mole of PtMole of Pt = 4.75×10¹⁴ moleMolar mass of Pt = 122 g/molMass of Pt =?Mass = mole × molar mass
Mass of Pt = 4.75×10¹⁴ × 195
Mass of Pt = 9.26×10¹⁶ g
3. Determination of the mass of 1.22×10²³ mole of AgMole of Ag = 1.22×10²³ moleMolar mass of Ag = 108 g/molMass of Ag =?Mass = mole × molar mass
Mass of Ag = 1.22×10²³ × 108
Mass of Ag = 1.32×10²⁵ g
4. Determination of the mass of 9.85×10²⁴ mole of CrMole of Cr = 9.85×10²⁴ moleMolar mass of Cr = 52 g/molMass of Cr =?Mass = mole × molar mass
Mass of Cr = 9.85×10²⁴ × 52
Mass of Cr = 5.12×10²⁶ g
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Help me to answer this pls
Answer:
1. 2
2. 2
3. 1
4. 2
5. 3
6. The number of waves that pass a point in a second
7. How close the waves are to each other
Explanation:
also, check out this answer key if you need it:
https://rmsteam72.weebly.com/uploads/1/2/7/2/127288658/waves_worksheet_answer_key.pdf
stay safe out there.
Research the compositions of Pennies. What was the composition of each of your Pennies prior to treatment
Answer:
History of composition
Years Material Weight (grains)
1944–1946 gilding metal (95% copper, 5% zinc) 48 grains
1947–1962 bronze (95% copper, 5% tin and zinc) 48 grains
1962 – September 1982 gilding metal (95% copper, 5% zinc) 48 grains
October 1982 – present copper-plated zinc (97.5% zinc, 2.5% copper) 38.6 grains
How many moles of Cl atoms are there in 65.2 g CHCl3?
Answer:
1.64 mol
Explanation:
Molar mass CHCI3=119.368
65.2g/119.368=0.54621*3(which is the number of molecules of CI in the formula)= 1.64 mol
Moles are defined as the smaller quantities that are presented in the substances. There is 1.64 mol of the chlorine atom in 65.2-gram chloroform (CHCl₃).
What are moles?Moles have been defined by the ratio of the mass of the substance to the molar mass of the compound or the substance. It is the measure of the amount of the substance present as smaller entities in the given compound.
The formula for calculating moles is given:
Moles = mass ÷ molar mass
Given,
Mass of chloroform = 65.2 gram
Molar mass of chloroform = 119.368 gm/mol
Substituting values from above in moles formula as:
moles (n) = mass ÷ molar mass
n = 65.2g ÷ 119.368 gm/mol
n = 0.54621 mol
In chloroform, there are three chlorine atoms so moles will be: 0.54621 × 3 = 1.64 mol.
Therefore, there are 1.64 moles of the chlorine atom in chloroform.
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How is oxygen produced from liquid air in industrial areas
What does neural mapping allow
scientists to view?
A. glucose levels in the brain
B. glial cell activation
C. where different things are handled in the brain
Will give brainleist
Answer:
The answer is C
Explanation:
An aqueous solution of lead (II) nitrate is mixed with a solution of sodium iodide to produce
Answer:
Lead(II) Nitrate + Sodium Iodide = Lead Iodide + Sodium Nitrate
Explanation:
Evaluate each pair to determine which object has the greater thermal energy.
Answer: first option
Explanation:
Answer: the bowl
Explanation:took the test
How many moles are in 164 x 1021 atoms of potassium?
Number of N in (NH) CrO
If you are traveling at 60mi/hr, how many meters per second is that equivalent to?
Answer:
26.8224 Meters per Second.
Which event is an example of an endothermic reaction?.
Write ionic equations for the following:
1. HNO3(aq) + NaOH(aq) → NaNO3(aq) + H2O(l)
2. HCl(aq) + KOH(aq) → KCl(aq) + H2O(l)
3. H2SO4(aq) + Mg(OH)2(aq) →MgSO4(aq) + 2H2O(l)
Answer:
1. H⁺ (aq) + NO₃⁻ (aq) + Na⁺ (aq) + OH⁻ (aq) → Na⁺ (aq) + NO₃⁻ (aq) + H₂O (l)
2. H⁺ (aq) + Cl⁻ (aq) + K⁺ (aq) + OH⁻ (aq) → K⁺ (aq) + Cl⁻ (aq) + H₂O (l)
3. 2H⁺ (aq) + SO₄²⁻ (aq) + Mg²⁺ (aq) + 2OH⁻ (aq) → Mg²⁺ (aq) + SO₄²⁻ (aq) + 2H₂O (l)
Explanation:
The ionic equation is an equation illustrating all the ions occurring in a reaction individually;
This is similar but can differ from the normal equation, because, typically, certain compounds consist of ions that dissociate in aqueous phase;
Net ionic equations can be found by eliminating all ions that remain the same, i.e. do not change state, which are known as spectator ions;
1. H⁺ (aq) + NO₃⁻ (aq) + Na⁺ (aq) + OH⁻ (aq) → Na⁺ (aq) + NO₃⁻ (aq) + H₂O (l)
Net: H⁺ (aq) + OH⁻ (aq) → H₂O (l)
NO₃⁻ ions are aqueous prior to the reaction and remain aqueous afterwards;
Similarly, the Na⁺ ions also remain aqueous;
The H⁺ and OH⁻, however, are aqueous (free ions in the solution) before the reaction;
After the reaction, these become the compound H₂O, a liquid so they do change state
2. H⁺ (aq) + Cl⁻ (aq) + K⁺ (aq) + OH⁻ (aq) → K⁺ (aq) + Cl⁻ (aq) + H₂O (l)
Net: H⁺ (aq) + OH⁻ (aq) → H₂O (l)
3. 2H⁺ (aq) + SO₄²⁻ (aq) + Mg²⁺ (aq) + 2OH⁻ (aq) → Mg²⁺ (aq) + SO₄²⁻ (aq) + 2H₂O (l)
Net: 2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)
A reaction is occurring in a test tube. How is heat transmitted to the surroundings?
As bubbles are formed and gas escapes, the heat is carried with the rising bubbles.
Molecules collide with the glass, and the glass molecules then transmit that energy to the outside.
Heat is carried out with matter as matter is changed with the surroundings.
All of the heat escapes out of the open top of the test tube as molecules collide with the air.
A reaction occurring in a test tube, the heat is transmitted to the surrounding when molecules collide with the glass, and the glass molecules then transmit that energy to the outside.
What is Heat?Heat is a form of energy that is transferred from one body to another due to the difference in temperature.
In a simpler term it is the transfer of energy from a hot object to a colder object.
Therefore, there is an interaction between bodies before heat occurs.
In our case, the molecules collides with the glass and the glass molecules then transmit that energy to the outside.
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Answers:
1)inside the fume hood
2)an erupting volcano
3)many molecular collisions occurring quickly
4)Molecules collide with the glass, and the glass molecules then transmit that energy to the outside.
5)Heat and matter can both transfer between the system and the surroundings.
2 C2H2(g)+5 O2(g) −→ 4 CO2(g)+2 H2O(g).
How much CO2 is produced when 30000 g
of C2H2 burns completely?
Answer in units of g
Answer:
I believe it'd be 101,538.4615 grams of CO2 (round as needed)
Explanation:
30,000 g C2H2 x 1 mol/26g x 4CO2/2C2H2 x 44g/1 mol = 101,538.4615 g
30,000 x 4 x 44 = 5,280,000
26 x 2 = 52,
5,280,000/52 = 101,538.4615 g
How many molecules are in 4 moles of H2O
Answer:
2.41 x 10^24 molecules
Explanation:
What is the chemical formula of calcium carbonate
What are the latin name of
silver
Gold
Iron
sodium
mercury
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Which statement concerning states of matter best describes a substance with loosely packed particles?
Answer:
Liquid
Explanation:
We have three states of matter. Solid, liquid and gaseous.
In the solid state the particles are very tightly packed and there is almost no motion of the particles.
In the gaseous state the particles are very far apart, the approximate average distance between particles, under normal conditions, is ten times the particle size.
The liquid state is an intermediate between these two states, so it would best describe a substance with loosely packed particles.