If an element has three valence electrons, it is most likely a metal.
In the periodic table, metals are found towards the left hand side of the table. Metals have fewer valence electrons than nonmetals. In the periodic table, there are more metallic than nonmetallic elements.
Metals of group 13 typically have three valence electrons. Hence, if an element has three valence electrons, it is most likely a metal of group 13.
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Which of the following is not a derived unit?
A) g/ml
B) liter
C) kg
D) All of these are derived.
Yo can someone explain the heat of fusion and heat of vaporization thing to me?
Answer:
The heat of fusion is the amount of energy required to change a solid into a liquid at its melting point. When a liquid becomes a solid, freezing or solidification has occurred. The heat of vaporization is the energy required to change a liquid into a gas at its boiling point.
Explanation:
How many Joules are there in 3301 calories? (1 cal = 4.18 J)
Answer:
13798.18 J
Explanation:
3301 cal * 4.18 J/1 cal = 13798.18
Recall that (1 cal = 4.18 J)
How many protons and neutrons are in the nucleus of zinc-72
Answer:
30 protons
Explanation: Each zinc isotope contains 30 protons, 30 massive, positively charged nuclear particles
30 protons, 34 neutrons, and 30 electrons.
ora
If a student is combining two
substances and sees bubbles and
is probably taking
fizzing, a
place.
A. chemical change
B. physical change
Answer:
A a chemical change
Explanation:
because a chemical change is when you mix tow substance together and they creat a new substance
A large office building is 1.07 102 m long, 31 m wide, and 4.25 x 102 m high. What is its volume?
Answer:
1409725 m^3
Explanation:
volume = length * width * height
volume = (1.07e2) * (31) * (4.25e2)
volume = 1409725 m^3
Fill in the [?]
73,542 m = [?] km
Give your answer in standard form.
The accepted value of Ksp is 1.2×10−12 for Ag2CrO4. Calculate the percentage error if your experimentally determined value for Ksp was 1.5×10−10.
The percentage error in the experimental determination is 124%.
The experimentally determined value for Ksp = 1.5×10^−10
The accepted value of Ksp = 1.2 × 10^−12
The formula for percentage error is;
% error = absolute value of ( actual value - experimental value)/actual value × 100/1
% error = absolute value of (1.2 × 10^−12 - 1.5×10^−10)/ 1.2 × 10^−12 × 100/1
% error = 124%
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Hydrogen protons collide with one another to create:
A). Helium and energy.
B). Boron and energy.
C). Carbon monoxide and energy. D). None of the above.
help please !!! THANK YOU !
Answer:The nucleus emits particles and/or energy.
Explanation:
How many grams of liquid water can be heated by 8920 joules through a change in temperature of 30K?
Answer:
One of water's most significant properties is that it takes a lot of energy to heat it. Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.
Explanation:
Michelle and john are walking down the street deep in conversation
Which best describes a meniscus?
If a raptor's wingspan were 112 centimeters, how long
would its body have to be for it to have a body-to-
wingspan ratio of 0.45?
Answer:
162.4 cm
Explanation:
please give brainliest award
An organic compound containing C, H, O gives the following data on analysis. Composition by mass: %
C = 52.2, % H = 13.0, % 0 = 34.8. Relative molecular mass = 46. Identify the molecular formula of the organic compound.
My answer is C2H6O. Is it correct?
Nadine was cooking a pot of potatoes on the stove. When the potatoes were don’t she needed to remove the potatoes for the water. Which separation technique would be most efficient and effective method for Nadine to use to achieve this
Answer:
boiling
Explanation:
Continual eruptions occur along mid-ocean ridges, forming new sea-floor rock. The
rocks closest to a mid-ocean ridge are the youngest | oldest. As you move away from
a mid-ocean ridge, the rocks get younger | older. This implies that crust is being
consumed | produced at mid-ocean ridges
The characteristics of the ocean ridges allow finding the results to complete the statements are:
The rocks near the ridge are YOUNGER. While you walk away the rocks are OLDER. This implies that the cortex is PRODUCING in the ridges.
The oceanic ridges are mountain ranges or chains of volcanic mountains at the bottom of the ocean, in these the magma that rises cools and forms young rocks, in they are pushed by the other rocks that emerge, in general they are located on the edges of the tectonic plates .
Therefore, the oceanic ridges are the point where the earth's crust is separating, therefore it has the youngest rocks and in the furthest points it has the oldest.
Let's find the correct words for each phrase to be correct:
The rocks near the ridge are YOUNGER. You walk away the rocks are OLDER. This implies that the cortex is PRODUCING in the ridges.
As a consequence of the characteristics of the ocean ridges, we can find the results to complete the statements are:
The rocks near the ridge are YOUNGER. While you walk away the rocks are OLDER. This implies that the cortex is PRODUCING in the ridges.
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HELP!! please choose all the correct answers, picture attached
Answer:
Only C. is wrong else every option is correct.
Explanation:
Hope this helps you. If you want explanation then ask in comments. Good luck!
Help Help Help!:
Which option would be an appropriate model of nuclear fission?
A. dividing a stack of paper equally between two people
B. taking a teaspoon of sugar from a bowl
C. disturbing a drop of water such that it breaks into smaller droplets
D. cutting a cake in half
Answer:
c
Explanation:
because your separating the atoms in the water
The appropriate model for nuclear fission is disturbing a drop of water such that it breaks into smaller droplets.
Nuclear fission refers to the disintegration of a large nucleus when it is bombarded with a small particle.
Usually, the protons in the nucleus repel each other strongly. Hence, as the atomic number of atoms continues to increase, this repulsion exceeds the nuclear attractive force causing the atom to disintegrate into smaller fragments called daughter nuclei when disturbed just as a drop of water such that it breaks into smaller droplets when disturbed.
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The substance chlorine monoxide, ClO(g), is important in atmospheric processes that lead to the depletion of the ozone layer. The ClO molecule has an experimental dipole moment of 1.24 D and the Cl−O bond length is 1.60 Å.
Part A: Determine the magnitude of the charges on the Cl and O atoms in units of the electronic charge, e.
Part B: Based on the electronegativities of the elements, which atom would you expect to have a partial negative charge in the ClO molecule?
Atom O or Atom Cl
Part C: Using formal charges as a guide, propose the dominant Lewis structure for the molecule. (Draw a diagram)
Part D: The anion ClO− exists. What is the formal charge on the Cl for the best Lewis structure for ClO−?
A) The magnitude of the charges on CI and O atoms are : +0.16e and -0.16e respectively
B) Atom O will have a partial negative charge on the CIO molecule
C) Attached below
D) The formal charge on Cl is +3
A) Determine magnitude of charges on CI and O
Magnitude of charge = dipole moment / bond length --- ( 1 )
where : dipole moment = 1.24 D * [tex](\frac{3.34*10^{-30} C m}{1 D} )[/tex]
Bond length = 1.60 A° * [tex]( \frac{10^{-10} m}{A^{0} } )[/tex]
∴ Magnitude of charge = 2.56 * 10⁻²⁰ C
Note : Charge of an electron = 1.602 * 10⁻¹⁹ C
Therefore the magnitude of charges on CI and O atoms is
2.56 * 10⁻²⁰ C * [tex]\frac{1e}{1.602*10^{-19} }[/tex] = 0.16 e
Therefore
charge on CI = +0.16e
charge on O = -0.16e
Hence we can conclude that A) The magnitude of the charges on CI and O atoms are : +0.16e and -0.16e respectively and Atom O will have a partial negative charge on the CIO molecule also The formal charge on Cl is +3
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HELP!! please choose all the correct answers, picture attached
Another way to say density
A. Density
B. Mass divided by volume
C. Water
D. Element
In chemistry, densities of substances are often compared to the density of this substance.
A. Density
B. Mass divided by volume
C. Water
D. Element
These have unique densities associated with them.
A. Density
B. Mass divided by volume
C. Water
D. Element
Answer:
A
Explanation:
Another way to say Density is Density
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. The density is mass divided by volume. the correct option is option A.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water. Density is mass divided by volume.
Mathematically, density can be written as : Density = Mass of the substance÷ volume marked on the graduated cylinder. Density is directly proportional to mass and inversely proportional to volume. Density of water is 1 gram per cubic centimeter.
Therefore, density is mass divided by volume. the correct option is option A.
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How many electrons does the oxygen atom need to become stable?
Answer:
2 electrons
Explanation:
Oxygen has 6 valence electrons and to be stable it needs 8. That means it needs 2 more electrons to have a full octet.
The table describes some characteristics of a layer of earth
Which layer is described by the data in the table?
crust
mantle
outer core
inner core
Answer:
crust .......
.........
Which of the following is a non-reactive metal with 2 valence electrons?
O Magnesium
Chlorine
Carbon
Helium
Answer:
» a. MagnesiumExplanation:
• Magnesium is least reactive and • Magnesium has atomic number 12. Its electronic configuration is 2,8,2 . Thus, it has 2 valence electrons.Darrell has 35 grams of melted chocolate. He pours all of the melted chocolate in molds. After he allows them to cool, Darrell has two solid bars of chocolate.
If the two solid chocolate bars contain all of the melted chocolate, what is their combined weight?
A.
It depends on how long it took the chocolate to cool.
B.
The chocolate bars weigh more than 35 grams.
C.
The chocolate bars weigh exactly 35 grams.
D.
The chocolate bars weigh less than 35 grams.
Answer:
A
Explanation:
it is correctly right????
Answer:
B.
The chocolate bars weigh more than 35 grams.
Suppose a scientist wants to test a new drug to fight the flu. The scientist injects the drug into 3 people with the flu. The scientist injects a harmless solution into three other people with the flu. In this experiment, what is the variable group and what is the control group?
Answer:
the people injected with the drug are the variable group while the people injected with the harmless solution are the control group
Alkali metals react violently with water. How much Hydrogen gas (in g) is produced when 10.0 g of sodium reacts with excess water according to the following equation?
2Na + 2H2O ----> 2NaOH + H2
The mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.
From the question,
We are to determine the mass of Hydrogen gas produced when 10.0g of sodium reacts with excess water.
From the balanced chemical equation for the reaction
2Na + 2H₂O → 2NaOH + H₂
This means
2 moles of sodium reacts with 2 moles of water to produce 2 moles of sodium hydroxide (NaOH) and 1 mole of Hydrogen gas.
Now, we will determine the number of moles of sodium present
Mass of sodium = 10.0 g
Atomic mass of sodium = 22.99 g/mol
From the formula
[tex]Number\ of\ moles\ = \frac{Mass}{Molar\ mass}[/tex]
∴ Number of moles of sodium present = [tex]\frac{10.0}{22.99}[/tex]
Number of moles of sodium present = 0.43497 mole
From the balanced chemical equation
2 moles of sodium reacts with 2 moles of water to produce 1 mole of Hydrogen gas.
Then,
0.43497 mole of sodium will react with 0.43497 mole of water to produce [tex]\frac{0.43497}{2}[/tex] mole of Hydrogen gas
[tex]\frac{0.43497}{2} = 0.217485[/tex]
∴ 0.217485 mole of Hydrogen gas was produced during the reaction
Now, for the mass of Hydrogen gas produced
Using the formula
Mass = Number of moles × Molar mass
Molar mass of H₂ = 2.016 g/mol
∴ Mass of Hydrogen gas produced = 0.217485 × 2.016
Mass of Hydrogen gas produced = 0.43845 g
Mass of Hydrogen gas produced ≅ 0.44 g
Hence, the mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.
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Fill in words that correctly complete this sentence. Anna looks around the skating rink and notices many examples of the movement of thermal energy. For example, she sees her friend holding a cup of hot chocolate in the cold rink. Thermal energy flows from ( ) matter to ( ) matter.
Answer:
hot to cold matter
what is the answer to (x+3)=4
Answer:
1
Explanation:
x + 3 =4
subtract 3 from 4
You are left with one.
Plug in the answer
1+3=4