Answer:
density = 8.9 g/ml
m = 20.5 g
V = ... ?
density = m/V
V = m / density
= 20.5 / 8.9
= 2.30337 ml
Which of the following is not a controllable risk factor?
a. smoking
b. inactivity
c. aging
d. over eating
Answer:
C) Aging
Explanation:
You can't stop that or change the rate that you age at. its inevetable :D
This is a science question.
What is the acceleration of this helicopter?
Answer:
7m/s
Explanation:
Is the acceleration of the helicopter
Help please ASAP it’s due at 12:30 pm !!
Answer:
1. Trace fossil. 2. Petrification 3. Freezing 4. Mold
Explanation:
Check out this long-form version of the periodic table. It shows where the two rows of
elements from question 4 really belong in the periodic table. Think about the challenges of
using this version of the periodic table.
Which statement offers the most likely explanation of why the long-form version of the
periodic table is seldom used?
The elements in the separate group are so rare that they do not occur in nature.
The elements in the separate group have very little in common with one another.
The long-form version no longer keeps the elements in order of increasing atomic
number.
The long-form version is too wide to easily fit on a computer screen or sheet of
paper.
Answer:
The long form version is too wide to easily fit on a computer screen or sheet of paper
Explanation:
Explain the importance of valence electrons in chemical bonding.
Answer:
Explanation: Understanding valence electrons is key to understanding chemical bonding. Delocalized valence electrons produce metallic bonds (bonds between atoms of metals) which give metals unique properties such as conductivity and ductility (draw metal into wires)
24H2S + 16HNO3 3Sg+ 16NO + 32H2O
Answer:
24 sultur with 48hydrogen+16 hydrogen,nitrogen and 48 oxygen+16 nitrogen,16 oxygen+62hydrogen and 32 oxygen
Explanation:
Etiquetas de productos de casa formula química, nombre de la formula, y el nombre del producto. Ejemplo NaCL, Cloruro de sodio, sal.
Answer:
Azucar, bicarbonato de sodio, lavandina, vinagre, amoniaco.
Explanation:
Podemos numerar estos compuestos
Azucar → Sacarosa → C₁₂H₂₂O₁₁
Lavandina → Hipoclorito de sodio → NaClO
Vinagre → Ácido acético → CH₃COOH
Bicarbonato de sodio → NaHCO₃
Amoníaco → NH₃
Identify the type of reaction depicted below:
2SO2(g)
+
O2(g) --> 2SO3(g)
Answer:
Combination reaction
Explanation:
In Chemistry, elements and compounds are involved in a process called chemical reactions, which are of different types namely: combination, decomposition, double replacement, combustion etc. A combination reaction is that reaction in which two or more substances called the REACTANTS combine together to form a single new substance called the PRODUCT.
In this case, a reaction is depicted as follows:
2SO2(g) + O2(g) --> 2SO3(g)
In this reaction, compound SO2 combines chemically with element O2 to form a single new compound SO3. Hence, this is a type of COMBINATION REACTION.
Select all the correct answers.
Based on the enthalpy changes given for the reactions, which reactions are endothermic?
Answer:
The reaction for which ΔH is positive are endothermic reactions. Explanation: The energy changes occur during the bonds formation and bonds breaking
what are some natural resources that are limited on earth
Answer:
oil, ores, and fossils.
Would you expect manganese(II) oxide, MnO, to react more readily with HF(aq) or NaOH(aq)?
Answer:
NaOH(aq)
Explanation:
NaOH(aq) is known to precipitate Mn^2+ ions according to the following reaction; Mn^2+(aq)+2OH^−(aq)↽−−⇀Mn(OH)2(s)
Hence, manganese(II) oxide reacts more readily with NaOH(aq) under ordinary conditions precipitating the metal hydroxide solid. This is one of the characteristic reactions of Mn^2+.
what further observation led mendeleev to create the periodic table
Answer:
;,knbbbknnbkhbln bhbj k; b; m j
Explanation:
Which type of bond is salt? a. covalent b. valence c. metallic d. ionic
Answer:
D. Ionic
Explanation:
It has ionic bonding! Good luck ^^
Everyone has a laughing place, The trouble is most people don't take the time to look for it.
true
or
false
Answer:
True
Explanation:
Answer:
True
Explanation:
Most people stick to what they know and don't look for a laughing place.
Speed of 5km. Pls help
Answer:
It's either A. or B. Im going with B. since the person is walking a constant speed
Explanation:
acceleration is basically when someone or something is increasing in speed
Plsss helpppp
im confused
will mark BRAINLIEST
Answer:
I searched the answer up on Brainly so its not my credit.
Explanation:
The answers D.
"If you have learned that metal + nonmetal ⟶ ionic bond, the answer is D, because N and C are the only pair of nonmetals.
However, if you have learned that a bond is ionic if the electronegativity difference (ΔEN) between the two atoms is greater than 0.7, the answer is A, B, and D.
The Li-Cl bond is definitely ionic.
For Na and C, ΔEN =1.62, so the Na-C bond is a highly polar covalent bond.
For Mg and C, ΔEN = 1.24, so the Mg-C bond is a polar covalent."
Hope this helps :D
Is the average atomic mass of a sample containing three lithium-6 and two lithium-7 closer to the mass of Li-6 or Li-7 ?
The average atomic mass of a sample closer to the mass of Li-6
Further explanationIsotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu
Mass atom X = mass isotope 1 . % + mass isotope 2.%
three Li-6, mass number = 6
two Li-7, mass number = 7
total abundance = 5
abundance for Li-6 =
[tex]\tt \dfrac{3}{5}\times 100\5=60\%[/tex]
abundance for Li-7 =
[tex]\tt \dfrac{2}{5}\times 100\5=40\%[/tex]
Average atomic mass :
[tex]\tt (0.6\times 6)+(0.4\times 7)=6.4[/tex]
Fill in the blanks: ______ compounds break up into ______ and ______ in solution, which can move freely and carry an _______ current.
I hate virtual school
Write the chemical formula for gold (I) sulfide.
Answer
Au2s
please mark me as brainlist
Question 1: A blocked-off meander eventually becomes
A)an oxbow lake.
B)part of the stream again
C) alluvial fan
D)rejuvenated.
Question 2: As the velocity of a stream decreases, which transported particle size would settle to the stream’s bottom first?
A) slit
B) clay
C)pebble
D) sand
I will mark brainliest!
Which particle has a high rate of deposition?
A. a low-density particle
B. a small particle falling off a cliff
C. a particle with jagged, rough ends
D. a large round particle settling on a surface
Answer:
C ! :)
Explanation:
Answer:
The correct answer is A
Explanation:
LOW-DENSITY PARRTICLE
What is the measurement from the line of origin to the crest?
A. Trough
B. Amplitude
C. Crest
D. Wavelength
Which expression is equal to the number of grams (g) in 2.43 kilograms (kg)?
2.43 kilograms times StartFraction 1000 grams over 1 kilogram EndFraction.
2.43 grams times StartFraction 1 kilogram over 1000 grams EndFraction.
StartFraction 1 over 2.43 kilograms EndFraction times StartFraction 1000 grams over 1 kilogram EndFraction.
StartFraction 1 over 2.43 kilograms EndFraction times StartFraction 1 kilogram over 1000 grams EndFraction.
Answer:
A. 2.43 kg x 1000 g/1 kg
Explanation:
I said so
Predict what would happen if a positive charge is placed between the two charges and allowed to move. Explain.
Answer: The same effect happens when you put two electrons near each other (or two protons). We know that if you have a single positively charged particle, a positively .
Explanation: i hope that helped. have a good day.
What effect does the spinning of the earth's core have?
A.it creates gravity
B. it creates matter
C. it creates mass
D. it creates the earths magnetic field.
Answer:
c
Explanation:
its c
Earth contains a spinning electric filed. The spinning of earth core creates its magnetic field. Thus, option D is correct.
What is a spinning body?A body which rotates in its own axis is called a spinning body. Earth rotates about its along with revolving around sun. The outer core of earth generates electric current. This is called telluric current.
Flow of this current creates an electric current which is parallels to the surface of earth. The direction of magnetic field lines will be perpendicular to the direction of current. But it comes stronger when parallel to current.
A rotating electric current results in the generation of a magnetic field. Thus spinning of earth core generates a magnetic field and therefore, option D is correct.
To learn more about magnetic field, refer the link below:
https://brainly.com/question/11514007
#SPJ2
What is the charge of this atom?
65 protons
60 electrons
A)-5
B)+5
C)0
Answer:
B. +5
Explanation:
People that need these answers.
1. How does sweat get to the sweat glands?
A. capillaries
B. ducts
C. arteries
D. veins
2. What hormone helps us to react to danger?
A. pituitary
B. thymus
C. adrenaline
D. thyroxin
3.
How many glands are part of the endocrine system?
A. 6
B. 8
C. 2
D. 4
4. What gland is located in the middle of the forehead and regulates the growth of bones?
thyroid gland
pituitary gland
parathyroid gland
pineal gland
Answer:
cater pillars piutyiry 6 throid gland
Answer:
1. how does sweat get to the sweat glands
Sweat gets to the sweat glands by passing through ducts
2. what hormone helps us react to danger
Adrenaline
#. how many glands are part of the endocrine system?
8
4. What gland is located in the middle of the forehead and regulates the growth of bones?
The pituitary gland.
Explanation:
Describe how sodium (Na) and chlorine (Cl) interact to form an ionic compound. Specifically, what is happening to an electron?
HELP! HELP!
an element with 5 protons, and 8 electrons has an atomic number of?
Answer:
Explanation: 15
Which statement best describes John Dalton's use of creativity in his work? He reinterpreted and retested Joseph Proust's results. He used a philosophy to conduct his experiment. He recorded his results as four parts of the atomic theory. He rejected Democritus's idea that matter was composed of atoms.
Answer: The correct statement is that,
'He reinterpreted and retested Joseph Proust's results'
Explanation:
John Dalton was an English chemist who contributed greatly to the field of Chemistry. He published his theory about atom in 1808.
Dalton was the first person to recognize a workable distinction between the fundamental particle of an element (atom) and that of a compound (molecule). The atomic theory generally summaries the laws of chemical composition which includes:
--> law of constant composition and
---> law of multiple proportions.
John Dalton was being creative in his work by reinterpretation and retesting of Joseph Proust's results. Joseph Proust was a French chemist that first discovered the law of constant composition in 1794. This means that many has started working on the atoms before John Dalton discovery.
From the previous works of Proust, he had studied tin oxides and found that their masses were either 88.1% tin and 11.9% oxygen or 78.7% tin and 21.3% oxygen (these were tin(II) oxide and tin dioxide respectively). Dalton retested and noted from these percentages that 100g of tin will combine either with 13.5g or 27g of oxygen; 13.5 and 27 form a ratio of
Dalton reinterpreted it by finding an atomic theory of matter that could elegantly explain this common pattern in chemistry – in the case of Proust’s tin oxides, one tin atom will combine with either one or two oxygen atoms. I hope this helps, thanks.
Answer:
A.) He reinterpreted and retested Joseph Proust's results
Explanation: