Answer:
8
Explanation:
It increases going up, because atom size is smaller, with greater energy levels; going right to left decreases, because they will have smaller charges when going through right to left.
Then, Calcium (Ca) is non-metal that reacts with Nitrogen (N), a non-metal. When 2 non-metal elements become a compound, it's covalent. Therefore, the bond between both of the elements are covalent.
1.) Convert 27 milliweasels to weasels
2.) Convert 27 milliohms to ohms
Please include your work step by step if you could, it will help me understand how to do this! Thanks.
Answer:
0.027
Explanation:
the beginning of each word (milli) just means a thousand.
take both number 27s and divide by 1000
it should be 0.027 for both.
you can also just ppretend there is a decimal place after 27 and move it to the left 3 spaces
Which phrase best describes electronegativity?(1 point)
A.) the partial charge an element carries in a covalent or ionic bond
B.) the number of electrons an element shares in an ionic bond
C.) the number of electrons an element has
D.) the relative strength with which an element attracts electrons in a chemical bond
Answer:
ELECTRONEGATIVITY is the tendency of an atom in the molecule to attract the bonded pair of electrons .
Explanation:
it might help you!!!!!!
Answer:
the relative strength with which an element attracts electrons in a chemical bond
Explanation:
hello can anyone pls help question in picture thx
Explanation:
Chlorine is a non metal so covalent bond. KBr has K metal and Br non metal of opp. charges so ionic bond. Na is a metal so ionic bond. NaCl has Na as metal and Cl as a non metal so ionic bond.
D is incorrect
which substance cannot be decomposed by a chemical change
Answer:
Nonbiodegradable substance
how many grams of HCl is produced from using just 1.5 moles of water
um I don't know just thanks :(
Answer:
i think it would be answer D
Explanation:
how many stereoisomers are possible for 2,4-heptadiene?
Answer:
Total of 4 isomers of hepta-2,4-diene are given
Explanation:
pls mark brainliest
hope this helps <3
when using vacuum filtration which type of tubing is best?
Answer:
The filter flask and the vacuum trap consist of heavy-walled glassware. You should use thick-walled tubings as well. Normal tubing that you use as water hoses will collapse under vacuum.
For vacuum filtration, thick walled tubings are best as they can withstand the pressure which is applied during filtration.
What is vacuum filtration?It is a filtration technique which works faster .This is because water is suck out the air in the vacuum flask and Buchner funnel by flowing it through the aspirator.
Filter at the bottom separates the solids from the liquids.Solid residue at top of funnel can be easily dried. The filtration takes place effeciently in presence of vacuum .
There is a rubber conical seal which ensures that the apparatus is hermetically closed,maintains vacuum in apparatus and avoids physical points of stresses.
Vacuum filtration is faster than gravity filtration and is more efficient leading to purer liquid. It is of much importance in crystallization.
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While Brian was cutting the end of the rubber tube, during chemistry lab, he accidently cut his finger. It was a minor cut and hardly any blood was visible. Brian should __________
a. tell his teacher immediately and do as directed.
b. go to the sink and wash his hand with soap and water.
c. place a towel over the wound and keep working.
d. continue working because he is ok.
Answer:
A because even if its a minor cut, it's always a better choice to inform someone.
Answer the question below. Use the rubric in the materials for help if needed.
Compare and contrast ionic and covalent bonds by explaining what the electrons do when bonding occurs. Use details to support your answer.
Answer:
..
...
....
Explanation:
hop it helps.....
Can two different substances have the same percent composition by mass?
Answer:
Although the terms mass percent and percent composition are used interchangeably, they are different terms. The mass percent refers to the percentage of a component in a mixture, while the percent composition refers to the percentage of a particular chemical element in a mixture.
Explanation:
Hope this helps...
Which of the three objects has the greatest density? Why? (GOLD BARS/GOLD COINS/GOLD CHAIN)
Answer:
They all have the same density
Explanation:
Density is an intensive physical property, meaning that as long as the chemical formula is the same, that specific intensive physical property will be the same. For example. One kilogram of feathers has the same mass as one kilogram of bricks. Why? They both have a mass of one kilogram.
It's the same thing here. Since all the objects are (assumed to be) made up of 100% gold, they would all have the same density regardless of the mass. For extra points, say the density of each object is [tex]19 \frac{g}{cm^3}[/tex].
Answerthey all have the same density Explanation:
The molar mass of sulfur S is 32.06 g/mol
Calculate the mass in grams of a sample of S containing 2.01x10^24 atoms
Help Please<3
Since we are starting from the number of atoms of Sulfur, we need to know two sets of formulas:
mass = moles × molar mass moles = atoms ÷ Avogadro's Number
⇒ mass = (atoms ÷ Avogadro's Number) × molar mass
mass = [(2.01 × 10²⁴ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (32.06 g/mol)
= 107.01 g
the mass of a sample of S containing 2.01×10²⁴ atoms is 107.01 g.The molar mass of sulfur S is 32.06 g/mol, then the mass in grams of a sample of S containing 2.01x10^24 atoms is 107.01 g
what is molar mass ?The molar mass can be defined as the weight of one sample mole, by Multiplying the subscript means the number of atoms times that element’s atomic mass and add the masses of all the elements in the molecule to obtain the molecular mass.
Molar mass is expressed in either gram ( g) or kilograms (kg).
Mass = moles × molar mass
moles = atoms ÷ Avogadro's Number
⇒ mass = (atoms ÷ Avogadro's Number) × molar mass
mass = [(2.01 × 10²⁴ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (32.06 g/mol)
= 107.01 g
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three moles of sodium carbonate are mixed with two moles of lead nitrate in aqueous solution, leading to formation of a solid precipitate. how many moles of spectator ions remain in solution, assuming 100% yield of the precipitate?
There are 4 moles of spectator ions that remain in solution.
The equation of the reaction is;
Na2CO3(aq) + Pb(NO3)2(aq) -------> PbCO3(s) + 2NaNO3(aq)
We have to determine the limiting reactant. This is the reactant that yields the least amount of product. Note that the spectator ions are Na^+ and NO3^- that form NaNO3.
For Na2CO3
1 mole of Na2CO3 yields 2 moles of NaNO3
3 moles of Na2CO3 yields 3 × 2/1 = 6 moles of NaNO3
For Pb(NO3)2
1 mole of Pb(NO3)2 yields 2 moles of NaNO3
2 moles of Pb(NO3)2 yields 2 × 2/1 = 4 moles of NaNO3
We can see that Pb(NO3)2 is the limiting reactant.
Since [NaNO3] = [Na^+] = [NO3^-], it follows that there are 4 moles of spectator ions that remain in solution.
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Which atom generally obtains a stable configuration by sharing electrons?
phosphorus (P)
magnesium (Mg)
lithium (LI
chlorine (CI)
Answer: Phosphorus (P)
Explanation: Phosphorous has 5 valence electrons so it will share some to become stable.
Answer: Phosphorus(P)
A hypothetical element has an atomic weight of 42.8452 amu. There are three main isotopes of this element with mass numbers of 41, 43 and 44. The 44 amu isotope has a 8% abundance. What is the percent abundance of the isotope with the mass number of 41?
1. 7.740%
2. 12.04%
3. 92.26%
4. 46.00%
5. 12.34\%
Answer:
Answer is 46.00%
Explanation:
absolute mass= A1F1 +A2F2
100
42.8452= 44×8% + 41×( 100--F2)
100
so you get
F2= 46.00%
am not sure
Write the electron configuration of the element fitting each of the following descriptions. a. The group 2A element in the fourth period b. The noble gas in the fifth period c. The group 2B element in the fourth period d. The group 6A element in the second period
Answer:
a. Calcium: [Ar]4s^2
or 1s^2 2s^2 2p^6 3s^2 3p^6 (= Argon) 4s^2
b. Xenon
c. Zinc
d. Carbon
Explanation:
Group 2A = Alkaline Earth; period 4 shows that the element will be calcium.
To write the Electron Configuration we remember that Columns 1&2 and Helium represent the s-orbital which holds a maximum of 2 electrons. Columns 13 through 18 fill the p-orbital.
Someone pls help me I will make you brain
Answer:
transmission clutches
Materials:
Food labels
Magnifying glass or eye glasses (if necessary)
Procedure:
1. Look for ten (10) food labels that you can find at home (ex. cereal drink, chocolate candy, soy sauce, etc.)
2. You may also find product labels other than food such as medicine, household
cleaning products, cosmetics, and toiletries.
3. List down in the table below, the compounds in the product label and the constituent
elements. There are cases that you will need to look up the constituent elements
because they may not be obvious from the compound name (e.g., citric acid, oil).
Write its uses.Use(s)/Function
4. Careful in handling corrosive substances. Use gloves or wash your hands after holding it.
Compounds and their constituent elements written in the food labels
Food Product
Compound
Constituent Element
Use(s)/Function
Ex. Cereal drink
Iron pyrophosphate
Iron, phosphorus, oxygen
Zinc sulfate
Zinc, sulfur, oxygen
What distinguishes compounds from elements? Applying, Synthesizing
pls help me...:((
Answer:
Nice experiment
Explanation:
the ion with 36 electrons, 34 protons, and 44 neutrons
Pls helppppppppppppppppppppppppp
Answer:
The sun reflects off different parts of the moon as it orbits the earth
Explanation:
Answer:
the sun reflects off different parts of the moon as it orbits the Earth.
Rocks can be classified based on texture. The size of the grains in a rock affects its texture. Coarse-grained rocks have large grains, and fine-grained rocks have small grains.
Rocks formed from magma under Earth’s surface have larger grains than rocks formed from lava on Earth’s surface. This is because magma cools slower underneath the ground than it does above ground.
What kind of rock is this?
A.Igneous
B.Metamorphic
C.Sedimentary
Where would this rock most likely be formed?
A. Along the sides of a volcano
B. On the ocean floor"
C.underneath the Earths surfaces
To which group of rocks would this rock belong?
A. Coarsed-Grained Rocks
B. Fine-Grained Rocks
C. Non-Grained Rocks
1. is Igneous rock
2. is underneath Earths surface
3. is Coarsed-grained
hope this help!!^^
The kind of rocks is igneous rocks formed along the sides of volcano and are coarsed-grain rocks.
What are igneous rocks?
Igneous rocks are one of the three main rock types the other two including sedimentary and metamorphic rocks.These rocks are formed by cooling and solidification of lava or magma.
The magma is derived from partial melts in the planet's mantle or crust.Melting is caused by increase in temperature or decrease in pressure or even change in composition.Solidification occurs either below surface which is called as intrusive rocks or on the surface as extrusive rocks.
They are classified according to their texture,mode of occurrence,chemical composition,geometry and mineralogy of rock.The two important variables for classification are mineral composition and cooling history.
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how do the melting points of enantiomers compare to each other? how do the melting points of diastereomers compare to each other?
Melting points of enantiomers will not compare to each other as they have same M.P. and Diastereoisomers are compared on the basis of melting point.
What are steroisomers?Stereoisomers are those isomers which are having the same molecular formula but different spatial arrangemet of atoms within the molecule.
Enantiomers: Enantiomers are pair of two stereoisomers which are having mirror image of each other, but are not superiposable. They have the same melting point so we can not compare enantiomers on the basis of their melting point.Diastereoisomers: Diastereoisomers are pair of those stereoisomers which are not having mirror image of each other, but are superimposable.They have different physical and chemical properties, so it can be compared on the basis of melting point.Hence, only diastereoisomers are compared on the basis of melting point.
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which solids will melt under applied pressure? check all that apply.
According to the forces of attraction , ice is a solid which will melt under applied pressure.
What are the forces of attraction?
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Which physical change is represented by the diagram below? SC.8.P.9.2
Answer: Substances giving off heat and light, themselves, is always chemical. What we see in the sky are new colors and light. 1. Changing the size and shapes of pieces of wood would be a chemical change. 2. In a physical change, the makeup of matter is changed.
Explanation:
Could someone please help me
Answer:
Whistle 2 has a lower pitch, but is louder.
Whistle 3 has higher pitch and is less loud.
Explanation:
The more frequent the arches are the higher the pitch.
The larger the amplitude the louder the sound is.
;D
plsss help I really need it:(((
Answer:
12. A
13. A
14. D
15. B
Explanation:
12. The 3rd law of motion is the force of our object being equal and opposite the other. If the Buller goes forward with force, the the gun recoils backwards with the same force.
13. There's nothing else described in the problem besides him getting kicked in the face
14. If you mive the oars forwards then the boat itself moves backwards
15. The gas helps push the rocket upwards since it goes downwards.
Why is alchemy no longer accepted?
A. Alchemists were not able to turn other metals into gold.
B. Scientists used evidence, analysis, and experiments to disprove
alchemy.
c. Alchemy became less popular once Aristotle died.
O D. The discovery of radioactivity took people's attention away from
alchemy
i think the answer is B. scientists used evidence, analysis, and experiments to disprove Alchemy. apologies if its incorrect.
The three most common states of matter on Earth are solids,blank
and gases. A fourth state,blank
exists in stars and in
flashes.blank
Answer:
example:meaning of the blank you need to do complete the wordsExplanation:
#CarryOnLearningSalt from evaporated seawater has been formed from
O a. artifical means
O b. solution
O c. volcanoes
O d. magma
Answer:
a
Explanation:
its formed from sodium and sodium metal is produced by electrolysis of dry molten sodium chloride.