Does the excess reactant get used up completely in a reaction??
Answer:
In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.
Explanation:
How many non-bonding electrons are present in PO43- ? Group of answer choices
What is the mass of 2.15 liters of N2 gas at STP?
Explanation:
mole number =mass/molar mass
mass=mole number × molar mass
mass= (volume of gas/volume at stp)molar mass
mass=(2.15/22.4)28
mass=2.69g
pls give brainliest
If you want to lower water's freezing point 18 degrees C by adding NaCl, what must the molality of the salt solution be? (K(f) for water ris 1.86 degree C/m)
Answer:
4.84 m
Explanation:
To solve this problem we need Frezing point depression.
Formula is: ΔT = Kf . m . i
ΔT = 18°C
This is data. ΔT is the difference, Freezing T° of pure solute - Freezing T° of solution.
Kf = 1.86 °C/m
m = molality. Our unknown.
i = Ions dissolved in solution, also called Van't Hoff factor.
NaCl → Na⁻ + Cl⁻
Sodium chloride can produce 2 moles of ions.
We replace data: 18°C = 1.86 °C/m . m . 2
18°C / (1.86 °C/m) . 2 = m
molality = 4.84
If a piece of pure gold jewelers weighs 11.81 grams, how many atoms is it made of?
Answer:30.573 Billion atoms are in one gram
Explanation:
Explain the method to decrease friction?
Answer:
having a smooth or lubricated surface may help decrease friction.
Explanation:
If 3.25 g N2 gas is introduced into an evacuated 1.50 L flask at 325 K, what is the pressure
inside the flask (in atm)?
Answer:
2.06 atm
Explanation:
The computation of the pressure inside the flask is shown below;
As per the ideal gas law
we know that
P V = nRT
where
V = 1.50L
T = 325 K
R = 0.0821
Now moles of N_2 is
= 3.25 ÷ 28
= 0.116 mol
Now
P = NRT ÷ V
= 0.116 × 0.0821 × 325 ÷ 1.50
= 2.06 atm
1.9 gm of a gas at 27 0C & 1.1 atm pressure occupies a volume of 1 ltr. The molecular mass of gas is, *
42.5 amu
3.83 amu
44 amu
32.5 amu
Answer:
42.5 amu
Explanation:
Using the ideal gas law equation;
PV = nRT
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question;
mass = 1.9g
T = 27°C = 27 + 273 = 300K
P = 1.1atm
V = 1L
n = ?
PV = nRT
1.1 × 1 = n × 0.0821 × 300
1.1 = 24.63n
n = 1.1/24.63
n = 0.045mol
Mole = mass/molecular mass
0.045 = 1.9/M.M
M.M = 1.9/0.045
M.M = 42.54amu
Which structure shows the correct electron arrangement in CC14?
Answer:
second one
Explanation
Warning eating fish caught in this lake may be dangerous to your health
Answer: it’s C hope that helps
Answer:
hmm I don't think its D because that doesn't have anything to do with your heath I don't think it's C either, probably not global warming so I think its A
Explanation:
I hope that helped :)
sorry if I'm wrong
Why is creativity important in scientific investigations?
a. Creative solutions are often needed to solve technical problems.
b. Scientists need to creatively adjust their data to prove their hypothesis.
c. There is no way to test a hypothesis, so creativity is necessary.
d. Most scientific experiments have no data.
Answer:
a. Creative solutions are often needed to solve technical problems.
Explanation:
Science in itself is a voyage of discovery. Scientific investigators focusing on various issues are often working hard to find creative solutions to complex technical problems.
In order to find solutions to all these problems bedeviling humanity, scientific investigators must be quite creative. Creativity is always at the bedrock of finding solutions to the complex technical problems of the world which happens to be the ultimate goal of science.
Hence, creativity is indispensable in scientific investigation and creative solutions are often needed to solve technical problems.
Answer:
a. Creative solutions are often needed to solve technical problems
Explanation:
Scientific investigation is the process using the scientific method which consists of empirical techniques in obtaining answers to question raised and used for driving the investigation
The scientist carrying out the investigation into the new area, is therefore required to be creative in adapting the available resources in answering the questions based on the scientific method
Depressants are often classified according to __________. Group of answer choices their MSA rating the degree to which they react with alcohol the degree they decrease CNS activity the first letter in their names
Answer:
the degree to which they decrease CNS activity
Explanation:
Drugs can be classified as;
✓hallucinogens, example is (LSD)
✓ stimulants, example is (cocaine)
✓opium-related painkillers example is (heroin)
✓depressants
Depressants can be regarded as medicines, that lowers neurotransmission levels, that is depressing or reducing arousal or stimulation as regards to various areas of the brain. these could be tranquilizers, as well as hypnotics and
sedatives. They are drugs used in slowing brain activity, therefore, making them useful when treating anxiety, sleep disorders, panic and acute stress reactions.
Example of Depressants are;
✓Xanax
✓Halcion
✓Klonopin
✓Librium
It should be noted that Depressants are often classified according to the degree to which they decrease central nervous system (CNS) activity.
HELP!! Suppose that the pressure of 1.00 L of gas is 380 mm Hg when the temperature is 200. K. At what
temperature is the volume 2.00 L and the pressure 0.750 atm?
1.-Identifica y menciona los elementos que
componen los siguientes compuestos e identifica las características de las mismas, sigue el ejemplo que se encuentra en el recuadro:
• Dióxido de carbono
• Alcohol etílico o etanol
• Azúcar
• Urea
• Bicarbonato de sodio
Answer:
y8y g8c g u to give give g gu tu tvtc8 ug fu t 7f to fu t7 to to tutorials
Explanation:
v8y to c g. fu uf gu t8 g8. g8 u g 8 g gi gi gi g gi if fu%:/"
What is the wavelength of a wave?
Answer:
Wavelength (λ) – The distance of one complete cycle in the wave. The distance between two consecutive crests and /or troughs. S.I. Unit: metre (m).
In other words:
Wavelength is the distance from crest to crest (or trough to trough).
What Reaction type is CO2(g) + H2O() — H2CO3(aq)
Answer:
Explanation:
this is a decomposition reaction because here a compound is broken into two two parts.
PLEASE HELP ASAP - PHOTO ATTACHED
Explanation:
1. 1NH4NO3 = 1N2O+ 2H2O
2. 2k + 2H2O = 1H2 + 2KOH
Is this an alpha or beta decay?
How do you balance this equation?
Answer:
Al4C3 + 12H2O = 3CH4 + 4Al(OH)3
Explanation:
Not sure if any explanation is needed but always start with the most complex compound. In this case it is Al(OH)3. You can see that there is 4 Aluminiums on the other side so I would start by putting a 4 next to the Al(OH)3. This now gives me 12 Hydrogens and 12 Oxygens on the right side. I put a 3 next to the CH4 to balance the Carbons on the left side. This leaves me with 12 Oxygens and 24 Hydrogens on the right side. This ends up being perfect because I can put a 12 next to the H2O.
How many moles of H2O are in 12.00 kg of water?
1. How many times more acidic is Lemon Juice than apples?
HELP ASAP PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
a. alkali
b. chemical
c. reactants
d. neutralised, acid
e. neutralisation
f. products
Explanation:
hope this helps and sorry if it is not right :)
Answer:
a). It is an ----Alkali.
b). ---a chemical reaction takes place.
c).----are the reactants in the reaction.
d).----the alkali has neutralized the acid.
e). --- is called a neutralization
f).---- of the products of the reaction is a salt.
Per:
Date:
Naming Covalent Molecules Worksheet
as for the following covalent compounds:
tribromide
monosilicide
xide
Answer:
sorry na lilito po ako sa questions eh lilituhin kase ako
what is diffrence bettwen thermal energy and heat
Answer:
Thermal, is mainly the heat trapped or in an object, such as a boiling water over a stove, its trapped and countinues to get hotter
Heat is basically the releasing of the energy that is contained in an object.
Thermal is the objects temperature, while heat is the Thermal energy that is released.
Explanation:
what will be observed when a piece of Ag metal is added to a Pb(NO3)2 solution?
What will be observed when a piece of Ca metal is added to a AgNO3 solution?
Answer:
Part a)
No Reaction
Part b)
CaNO3 is formed
Explanation:
Part a)
Silver is less reactive than lead and hence when Ag metal is added to a Pb(NO3)2 solution there will be no reaction
Ag (s) + Pb(NO3)2 (aq) --> Ag (s) + Pb(NO3)2 (aq)
Part b)
Calcium is more reactive than silver and hence when calcium is added to the solution of AgNO3, it will replace Ag from the AgNO3 and itself form compound with NO3 2- ion.
The reaction for the same is
Ca (s) + AgNO3 = CaNO3 + Ag (s)
Which of the following acids is in household vinegar? A nitric acid hydrochloric acid C fluoric acid D acetic acid
Answer: Out of the given options acetic acid is in household vinegar.
Explanation:
Household vinegar is the one that is commonly used in our home while cooking a number of dishes.
The common name of vinegar is acetic acid and its chemical formula is [tex]CH_{3}COOH[/tex].
For example, vinegar (acetic acid) is used while making noodles.
Thus, we can conclude that out of the given options acetic acid is in household vinegar.
please help me asap i will mark u as brainly and give u 10 points
7 u
Atomic mass = Mass of protons + mass of neutrons
⇒ Atomic mass = 4 u + 3 u = 7 u.
Tip: Electrons have negligible mass.
Mass of e- = 1/2000 × mass of p+.
Answer:
7
Explanation:
To find the Atomic Mass, you just add the protons and neutrons together.
Which of the following pH numbers are acidic? (Choose 2)
9
11
7
5
3
the pH numbers that are acidic above is 3 and 5
How many grams of oxygen does it take to produce 9.60 moles of carbon dioxide?
307.2grams of oxygen does it take to produce 9.60 moles of carbon dioxide.
Answer:
Solution given:
1 mole of Oxygen=16g
Explanation:
C +O2=CO2
1 mole+ 1 mole =1 mole
12g. + 32g = 44g
we have
1 mole of carbon dioxide=12g of C and 32 g of O2
9.6 mole of carbon dioxide=12*9.6g of C and 32 *9.6g of O2
grams of oxygen needed is 32*9.6=307.2g
Which of the following is NOT TRUE for both mitosis and meiosis?
a they both preceded by interphase
b. they both split cells thru cytokinesis
c. they divide according to a common pathway
d. they are both involved in the division of somatic cells
Answer:
d. they are both involved in the division of somatic cells
Explanation:
Mitosis and meiosis are both types of cell divisions that occur in the system of living organisms. However, mitosis and meiosis are different in the type and number of daughter cells they give rise to and also where they occur.
Mitosis, which takes place in the SOMATIC OR BODY CELLS of living organisms, give rise to two daughter cells that are genetically identical to their parent cell. On the other hand, meiosis takes place strictly in the CELLS OF REPRODUCTIVE ORGANS, and gives rise to four genetically different daughter cells.