Answer:
B for sure
Explanation:
Because they all consume
what are the roles of the mucous select two options PLEASE HELP
Answer:
The answer is A and C
If a cell were compared to a school, which part of the school would represent the cell's nucleus?
ОА the classroom walls because they give the structure to the school
B
the cafeteria cooks because they make food for the entire school
С
the principal because he or she controls all the activity in the school
D
the fence because it controls what enters and exits the school
Answer:
C-The principal because he or she controls all the activity in the school
what is 20+9-10+67=?
Answer:
86
Explanation:
20 plus 9 equals 29 minus 10 equals 19 plus 67 equals 86
Answer:
86
Explanation:
20+9=29
29-10=19
19+67=86
An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?
0
24
28
52
Answer:
24
Explanation:
In an uncharged atom, the number of protons is always equal to the number of electrons. For example, carbon atoms include six protons and six electrons, so carbon's atomic number is 6.
Similarly, since an atom of chromium contains 24 protons, it also contains the same amount of electrons, which is 24.
Answer:
24 is your answer
Explanation:
Which of the following do/does not change with the change in temperature?
i. Mole fraction.
ii. Molality.
Select one:
a. only i
b. Only ii
c. Both i & ii
d. Neither of them
(I did D and it was incorrect)
Answer:
c. Both i & ii
Explanation:
Moles do not change with temperature hence Mole fraction does not depends of temperature.
Molality is number of moles of solutes per kilogram of solvent. It has no relationship with temperature.
This means both of them do not change wit the change in temperature.
Correct option;
c. Both i & ii
8.
Sulfur trìoxide decomposes to sulfur dioxide and oxygen gas as
shown in the following reaction:
2503 (g) 2502 (g) + O2 (g)
Given a 240.0 g sample of sulfur trioxide (MM = 80.1 g/mol), how many
grams of oxygen (MM = 32.0 g/mol) are produced, assuming the
decomposition goes to completion?
g
Your answer should be rounded to three significant figures. Do not include units in your
answer
Mass of Oxygen : 47.9
Further explanationGiven
2S03 (g)⇒ 2S02 (g) + O2 (g)
240 g SO3
Required
mass of Oxygen
Solution
mol SO3 :
= 240 g : 80.1 g/mol
= 2.996
From the equation, mol O2 :
= 1/2 x mol SO3
= 1/2 x 2.996
= 1.498
mass O2 :
= 1.498 mol x 32 g/mol
= 47.9
Taking into account the reaction stoichiometry, given a 240.0 g sample of sulfur trioxide, 47.95 grams of oxygen are produced, assuming the decomposition goes to completion.
Reaction stoichiometryIn first place, the balanced reaction is:
2 SO₃ → 2 SO₂ + O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
SO₃: 2 molesSO₂: 2 moles O₂: 1 moleThe molar mass of the compounds is:
SO₃: 80.1 g/moleSO₂: 64.1 g/mole O₂: 32 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
SO₃: 2 moles ×80.1 g/mole= 160.2 gramsSO₂: 2 moles ×64.1 g/mole= 128.2 grams O₂: 1 mole ×32 g/mole= 32 gramsMass of oxygen producedThe following rule of three can be applied: if by reaction stoichiometry 160.2 grams of SO₃ form 32 grams of O₂, 240 grams of SO₃ form how much mass of O₂?
[tex]mass of O_{2} =\frac{240 grams of SO_{3}x 32 grams of O_{2} }{160.2grams of SO_{3}}[/tex]
mass of O₂= 47.94 grams
Given a 240.0 g sample of sulfur trioxide, 47.95 grams of oxygen are produced, assuming the decomposition goes to completion.
Learn more about the reaction stoichiometry:
brainly.com/question/24741074
brainly.com/question/24653699
How many grams of Ag are produced if I start the reaction with 5.5 mol Cu?
Equation given:
Cu + 2AgNO3 -> 2Ag + Cu(NO3)2
Answer:
9.34 g Ag
Explanation:
You can increase a step-up transformer's voltage with
A. a power source connected to the primary coil
B. a source connected to the secondary coil.
C. increasing the number of loops in the primary coil.
D. increasing the number of loops in the secondary coil
Answer:
A. a power source connected to the primary coil
Explanation:
with 24.1 moles of P4O10 how many moles of H3PO4 could be made
When solid materials are heated.the heat absorbed/added to the materials caused the materials to change its form
Complete question is;
When solid materials are heated.the heat absorbed/added to the materials caused the materials to change its form from?
Answer:
From solid to liquid
Explanation:
When we heat solid materials, the heat causes the forces of attraction between the molecules to become weaker and as such, the material becomes more loose than it was in the solid state. As a result, the material now becomes a liquid because the molecules now have lesser forces of attraction and are a bit loose.
Magnesium bromide is prepared in a laboratory using the reaction below. Typically, the magnesium bromide is recoveted as a solid by heating way the remaining water
Mg(s) + 2 HB-(aq) - MgBrac) + H200)
If 0.940 mole of HBr in solution is added to 16.5 grams of Mgo in a beaker and then is heated until dry, what are the expected contents of the beaker?
Why does Play-Doh taste salty?
Pls my science teacher wants an answer so pls answer ASAP i need an explaination
Answer:
It's made of salt
Explanation:
The recipe has salt as an ingredient
Answer:
playdoh is literally made of salt. thats why it tastes salty
Explanation:
12 G of carbon react with 16 G of oxygen how much carbon monoxide is formed
Answer:
28 g CO
Explanation:
First convert grams to moles.
1 mole C = 12.011 g (I'm just going to round to 12 for the sake of this problem)
12 g C • [tex]\frac{1 mol C}{12 g C}[/tex] = 1 mol C
1 mol O = 15.996 g (I'm just going to round to 16)
16 g O • [tex]\frac{1 mol O}{16 g O}[/tex] = 1 mol O
So the unbalanced equation is:
[tex]C + O_{2}[/tex] -> [tex]CO[/tex] (the oxygen has a 2 subscript because it is part of HONClBrIF meaning when not in a compound these elements appear in pairs - called diatomic elements)
The balanced equation is:
[tex]2 C + O_2[/tex] -> [tex]2 CO[/tex]
However, carbon is the limiting reactant in this equation and two moles cannot react because only 12 g (1 mole) are present. Therefore, use the equation
[tex]C + \frac{1}{2} O_2[/tex] -> [tex]CO[/tex].
1 mole of CO is formed, therefore 12 g + 16 g = 28 g CO.
A metal crystallizes in the face‑centered cubic (FCC) lattice. The density of the metal is 12020 kg/m3, and the length of a unit cell edge, , is 389.08 pm. Calculate the mass of one metal atom in grams.
Answer:
1.7700×10^-22 g
Explanation:
A face-centered-cubic cell contains 4 atoms, so the volume per atom is ...
(389.80×10^-12 m)³/(4 atoms) ≈ 1.4725×10^-29 m³
Then the mass of 1 atom is ...
(12020 kg/m³)(1.4725×10^-29 m³) ≈ 1.76995×10^-25 kg
≈ 1.7700×10^-22 g
_____
Additional comment
That is the approximate mass of a Palladium atom.
Answer:
1.7700×10^-22 g
Explanation:
NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2
What are the reactants and products also add why
MARKING BRAINLIEST
Choose the products that complete the reaction. The chemical equation may not be balanced.
NaHCO3 + HC2H3O2
Answer: NaC2H3O2 + CO2 + H2O
Which characteristic is true of sexual reproduction but not of asexual reproduction?
Answer:
Sexual Reproduction involves two different parties
Explanation:
Asexual is the opposite, so it uses no one else to reproduce
Answer:
Sexual reproduction produces diverse offspring .
Sexual reprodction produces more variations whereas asexual reproduction usually produces very similar organisms
Explanation:
How many moles of S would I have if I had 11 grams? (Stoichiometry) HELP
0.34 mol S
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
11 g S
Step 2: Identify Conversions
[PT] Molar Mass of S - 32.07 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 11 \ g \ S(\frac{1 \ mol \ S}{32.07 \ g \ S})[/tex]Multiply/Divide: [tex]\displaystyle 0.343 \ mol \ S[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
0.343 mol S ≈ 0.34 mol S
5. If all the particles in a material are made up of
several smaller particles, and every larger particle
is identical, is the material a pure substance or
not? Explain your reasoning.
Answer:
No. Because a pure substance, no matter if an element, compound, it can only contain one kind of particle .
Explanation:
"Show a general equation for polymerisation"
Answer:
Polymerisation is the chemical process of monomers joining together to form polymers, often it takes many thousands of monomers to make a single polymer.
Explanation:
Calculate the mass (in g) of solute needed to prepare a solution with the given concentration and volume.
Sea water has a concentration of approximately 0.60 M sodium chloride. How much
sodium chloride is dissolved in 1.00 L of solution?
Coke has a concentration of 0.342 M. What mass of sugar (in g) is dissolved in a 2-L
bottle of coke?
What volume of concentrated nitric acid (15.8 M) is needed to prepare 4.0 L of a 2.0 M solution?
What volume of 9.0 M copper (II) sulfate stock solution is needed to prepare 3.0 L of a 5.0 M
solution?
Answer:
1. 35g NaCl.
2. 234g sugar.
3. 0.506L of concentrated nitric acid are needed.
4. 1.67L of 9.0M copper (II) sulfate are needed
Explanation:
Molarity is defined as the ratio between moles of solute and the volume of the solution.
1. 1.00L * (0.60mol / L) = 0.60 moles NaCl are dissolved
To convert moles to mass we must use its molar mass:
0.60mol NaCl * (58.44g/mol) =
35g NaCl
2. 2L * (0.342mol / L) = 0.684 moles Sugar = moles sucrose
0.684 mol * (342.30g / mol) = 234g sugar
3. 4L of a 2.0M are:
4L * (2.0mol/L) = 8moles
8mol * (1L / 15.8mol) = 0.506L of concentrated nitric acid are needed
4. 3.0L * (5.0 mol / L) = 15.0 moles copper (II) sulfate.
15.0mol * (1L / 9.0mol) = 1.67L of 9.0M copper (II) sulfate are needed
Summarize how you would go about calculating the grams of product given the grams of reactant you start with.
Explain how steam causes burns by describing the transfer of heat.
Answer:
It will be : (in simple terms)
Condensation of hot steam or hot vapor on the cooler skin releases the water's latent heat of vaporization, rapidly raising the temperature of the skin which will result in steam burns.
Hope it helped
All the best!!
HELP ASAP!!! please chemistry sucks
PLEASE CAN SOMEONE EXPLAIN this FOR ME WHAT IS RADIOACTIVE ISOTOPES AND ANSWER THIS QUETION? A nitrogen atom has 7 protons and most common isotopes of nitrogen has 7 neutrons. A radioactive isotopes of nitrogen has 8 neutrons write the atomic number and mass number of this radioactive nitrogen as a chemical symbol with a subscript and superscript.
Answer:
[tex]\frac{15}{7}N[/tex]
Explanation:
We already know that the mass number of an atom is the sum of the number of protons and the number of neutrons.
So, the mass number of this isotope is;
Number of protons = 7
Number of neutrons = 8
Mass number = 7 + 8 = 15
Hence, the isotope is;
[tex]\frac{15}{7}N[/tex]
help meh......please...
Answer:
The third one
Explanation:
Nickel-62 has the highest binding energy per nucleon of any isotope for any element. Isotopes heavier than 62Ni cannot be formed by nuclear fusion without losing energy.
Helppp 88.0 grams of Boron, how many atoms of Boron (B) are present?
Answer:
There are no atoms becuase atoms are not in elements.
Explanation:
Our bodies use nitrogen
Question 2 options:
directly from the air
after bacteria make N into ammonia molecules
from the plants and other animals we eat
all of the above
it's the 1 and 3 I think it's that hopefully it's right
Which is Not part of hydrogen's line-emission spectrum?
Answer: Aufbau series.
Explanation:
1.a)concentrated sulphuric acid reacts with ethanol to produce ethene
(i) state the conditions for the reaction
.......................................................................
write the equation of the leads to formation of ethene In (a) (i) above.
.....................................................................................
state the property of sulphuric acid shown in reaction (a)(ii)
...................................................................................
Answer: a) Temperature of [tex]170^0C[/tex]
b) [tex]C_2H_5OH\stackrel{conc H_2SO_4, 170^0C}\rightarrow C_2H_4+H_2O[/tex]
c) dehydrating agent
Explanation:
Ethanol is heated with an excess of concentrated sulfuric acid at a temperature of 170°C to produce ethene.
The balanced chemical reaction is:
[tex]C_2H_5OH\stackrel{conc H_2SO_4, 170^0C}\rightarrow C_2H_4+H_2O[/tex]
Here concentrated sulfuric acid removes a water molecule from ethanol and thus acts as a dehydrating agent.
A 150 g sample of brass at 90.0 degrees Celsius is placed in a calorimeter cup that contains 230 g of water at 20.0 degrees Celsius. Disregard the absorption of heat by the cup and calculate the final temperature of the brass and water. Specific heat of water = 4.18 J/gC, specific heat of brass=0.380 J/gC.
Answer:
for brass
mass m1 =150g
t1=90°c
specific heat of brass s1=0.380 J/gC.
for water
t2=20°c
mass m2=230g
Specific heat of water s2= 4.18 J/gC,
Explanation:
we have
Q1=Q2
m1s1{t-t1)=m2s2(t2-t)
150×0.380(t-90)=230×4.18(20-t)
57t-5130=961.4×20-961.4t
57t +961.4t=19228+5130
1018.4t=24358
t=24358/1018.4=23.91=24°c is final temperature