Answer:
hnjilbglu
Explanation:
nbjl,bhuk
N3- has:
A. 7 protons and 4 electrons
B. 7 protons and 10 electrons
C. 7 protons and 11 electrons
D. 7 protons and 12 electrons
Answer:
B. 7 protons, 10 electrons
Explanation:
hope this helps :)
1. Why
are atoms considered the building blocks of life?
Answer:
Explanation:
Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you. ... A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons.
Which has higher percentage of oxygen: (Fe = 56, O = 16, C = 12) a) FeO b) FeCO3 c) Fe2O3 d) Fe3O4
B)
FeO = 56, 16, 0
FeCO3 = 56, 48, 12
Fe2O3 = 112, 48, 0
Fe3O4 = 168, 64, 0
Identify the state(s) of matter that each property describes.
takes the shape of its container:
gas
liquid
solid
fills all available space:
gas
liquid
solid
maintains its shape:
gas
liquid
solid
can be poured:
gas
liquid
solid
is compressible:
gas
liquid
solid
has a fixed volume:
gas
liquid
solid
Answer:
1) takes the shape of its container ( liquid and gas).
2) fills all available space (gas)
3) maintains its shape ( solid)
4) can be poured ( liquid)
5) is compressible ( gas)
6) has a fixed volume ( liquid and solid)
Explanation:
Matter is simply defined as anything that has weight and occupies space. It exists in three states, namely: solid, liquid and gaseous states.
The properties of different states of matter includes:
SOLID STATE
--> It has a definite shape: The shape of a solid is fixed; it does not depend on the shape of other materials.
--> It has a definite volume: it occupies its own shape due to the force of cohesion among its molecules.
--> It is tightly packed: The molecular movements of particles are negligible.
LIQUID STATE
--> liquid has a defined volume.
--> it has no definite shape: There is no specific shape of a liquid. It occupies any available space. It's shape depends on the shape of the container into which it is poured.
GASEOUS STATE
--> it has no fixed shape: Due to the distance in the molecules of gas, the gaseous state has no shape. It occupies the shape of its container.
--> It has no fixed volume: it occupies the shape of any container that is closed.
--> It is highly compressible: The particles of gas are far off from one another and there is room for collision.
which of the following causes acid rain?
Answer:
acid and rain
Explanation:
acid rain
Answer:
acid rain is checimal reaction to sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain. Bascalliy it's because of sulfur dioxide and nitrogen
Explanation:
nitrogen and phosphorus would form what kind of bond
Answer:
The size of a phosphorus atom also interferes with its ability to form double bonds to other elements, such as oxygen, nitrogen, and sulfur. As a result, phosphorus tends to form compounds that contain two P-O single bonds where nitrogen would form an N=O. double bond.
Explanation:
When 6.02 x 1023 is multiplied by 9.1 x 10-31, the product is
a. 5.5 x 10^-9
b. 5.5 x 104-8
c. 5.5 x10^-31
d. 5.5 x 10^-7
Answer:
D
Explanation:
^^
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, the correct option is option D that is 5.5 x 10⁻⁷.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms/electrons/formula units which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
6.022×10²³× 9.1 x 10⁻³¹= 5.5 x 10⁻⁷
9.1 x 10⁻³¹ is mass of an electron. Firstly multiply the base then add the power.
Therefore, the correct option is option D.
To know more about mole, here:
https://brainly.com/question/15209553
#SPJ2
If you add 50 mL of 0.20 M NaOH to a 50 mL solution of 0.60 M HF, what is the pH of the resulting buffer
Answer:
pH = 2.87
Explanation:
When NaOH reacts with HF NaF and H2O are produced:
NaOH + HF → NaF + H2O
That means after the reaction moles of NaF are equal to moles of NaOH added and moles of HF are initial moles of HF - moles of NaOH added:
Moles NaOH = Moles NaF:
0.050L * (0.20mol/L) = 0.01 moles of NaF
Moles HF:
0.050L * (0.60mol/L) = 0.03 moles HF = Initial moles
0.03 moles - 0.01 moles = 0.02 moles HF
To find pH we need to use H-H equation to determine pH of the buffer:
pH = pKa + log [NaF] / [HF]
Where pH is pH of the buffer
pKa is pKa of HF-NaF buffer: 3.17
And [] could be taken as moles of each species.
That is:
pH = 3.17 + log [0.01] / [0.02]
pH = 2.87
Determine the [OH−] of a solution that is 0.150 M in CO2−3.
Kb(CO32−)=1.8×10−4
The [OH−] of a solution : 0.0052 M
Further explanationKb is the base ionization constant
LOH (aq) ---> L⁺ (aq) + OH⁻ (aq)
[tex]\rm Kb=\dfrac{[L][OH^-]}{[LOH]}[/tex]
Dissociation of weak base of CO₃²⁻ :
Reaction
CO₃²⁻ + H₂O⇒ HCO₃⁻ + OH⁻
use ICE method :
I : 0.15 0 0
C : x x x
E : 0.15-x x x
[tex]\tt Kb=\dfrac{[HCO_3^-][OH^-]}{[CO_3^{2-}]}\\\\1.8\times 10^{-4}=\dfrac{x^2}{0.15-x\approx 0.15}\\\\x^2=1.8\times 10^{-4}\times 0.15\\\\x=0.0052[/tex]
what tell us how much an atom wants to gain an electron ?
Answer:
more than 8 atoms wants to gain an electron
True or False.All matter is made up of tiny particles called atoms.
HELP! I DON'T UNDERSTAND!?
Answer:
DECREASES THIS IS OBVIOUS
Explanation:
How can you change a objects state of matter
Answer:
Changing states of matter occur when matter loses or absorbs energy. When a substance absorbs energy the atoms and molecules move more rapidly and this increased kinetic energy pushes particles far enough, that they change form. This energy is usually heat or thermal energy.
Explanation:
as i increase the amount of solute without changing the amount of solvent i increase the solutions....?
Answer:
concentration?
Explanation:
solute = The dissolved substance in a solution.
solvent = The liquid in which the solute dissolves to form a solution.
Answer:
the only marked thing was in new game for the quiz that link yes to be in a relationship
Explanation:
you followed a 1 or a 1 year of high.
the key term which means moon blocks sunlight to the earth is
Answer:
Solar eclipses
Explanation:
Nobody answering my questions what the answer givng brainliest
Answer: I think it’s B. Because as you can see from the picture there are layers
Explanation:
I think but just in case ask for a second opinion
Answer:
C. Air bubbles
Explanation:
Cant be A because.... you cant freeze a tempreature
Cant be B because... organism types cant show precipitation patterns.
Cant be D because....well it could be D, but there isnt a way to prove humans increased the tempreature
ITS C hope it helps :)
I also got this question before
will give brainliest to correct answer
Answer:
2.5 grams
Explanation:
you can see it on the graph
All of the following explains how humans affect energy problems except?
Energy needs increases as human demands increase.
Humans mine more oil and coal to produce energy.
Humans are more motivated to do better in their profession.
The increase of human population adds more to energy needs.
Answer: I think its (B) Humans mine more oil and coal to produce energy.
Explanation: Hope this helps!
HELPPP PLEASEEE....
How does a glass of juice become cold when you add ice to it?
aThe ice makes the glass colder so the juice becomes colder.
bThe ice cools the glass of juice because the slow moving particles in the ice cause the particles of the juice to slow down.
cIce is colder than the juice. The cold travel from cold to warm until both items are the same temperature.
dThe juice is warmer than the ice. Heat travels in one direction until both items are the same temperature.
Answer:
C.
Explanation:
The other ones just don't make sense as answers to the question
Answer:
B
Explanation:
ice molecules move slowly and cluster tightly together, they produce a low amount of heat
g (True/false)Sodium borohydride, NaBH4, is a reducing reagent which converts carbonyl to carboxylic acids
Answer:
False
Explanation:
Sodium borohydride, NaBH4 is a reducing agent. The conversion of a carbonyl to carboxylic acids is an oxidation reaction.
Sodium borohydride, NaBH4 does not perform an oxidation reaction, it is only used for reduction reactions. Hence the statement in the question is false.
Which staternent is true for balanced chermical equations?
Answer:
A chemical equation expression which is...
g If you forgot to fill the tip of the NaOH buret, took your initial reading and then completed the titration, what measurement would be affected
Answer:
The volume of NaOH used
Explanation:
The tip of the buret is part of its calibration. If this tip is not filled before taking the initial reading, the volume of NaOH used at the end of the titration would be inaccurate.
In order to avoid this, the valve of the buret should be opened and the NaOH allowed to displace whatever air that might have been trapped at the tip before the initial buret reading is taken and the titration is carried out.
The ____ are new substances that are created following a chemical reaction. *
A:chemical reactions
B:products
C:reactants
D:coefficients
Answer:
b
Explanation:
Is iced coffee a solution?
The reaction described in Part A required 3.54 L of magnesium chloride. What is the concentration of this magnesium chloride solution?
we need the cholride solution Part B to answer your question
Help me on this question esplain
Answer:
They have the same number of valence electrons (5) so the body assumes they are the same element.
The elements fluorine (F), chlorine (Cl), and iodine (I) are all part of the same _________on the periodic table.
Explanation:
The elements Fluorine (F),Chlorine (Cl) and Iodine (I) are all part of the same Group ( i.e, Group 17 ) on the periodic table.
Answer:
Group
Explanation:
(N2 & O2 & Ar & CO2...)
an element compound or mixture?
Answer: Mixture
Explanation:
Element is a pure substance which is composed of atoms of similar elements.
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.
Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air which conatins a mixture of [tex]N_2[/tex], [tex]O_2[/tex] , [tex]Ar[/tex] and [tex]CO_2[/tex]
Writing Chemical Equations
Write and balance the equation showing the reaction between zinc metal and aqueous sulfuric acid to form aqueous zinc sulfate, sulfur dioxide gas, and water.
Answer:
1) 1 N2 + 3 H2 2 NH3
2) 2 KClO3 2 KCl + 3 O2
Explanation:
That would help!! Stay safe
7. Intermolecular forces hold the oxygen and hydrogen atoms together in a water molecule.
a. TRUE
b. FALSE
