Answers
Related Questions
what is a good way to define lunar
Answers
What is the molality of a solution made by dissolving 2 moles of NaOH in 6 kg
of water?
A. 0.33 mol/kg
B. 12 mol/kg
C. 3 mol/kg
D. 2 mol/kg
Answers
The molality of a solution : m = 0.33 mol/kg
Further explanationGiven
2 moles of NaOH in 6 kg of water
Required
The molality
Solution
Molality shows how many moles are dissolved in every 1000 grams of solvent.
m = n x (1000/p)
m = Molality
n = number of moles of solute
p = solvent mass (grams)
Input the value :
solute : NaOH
solvent : water
m = 2 moles : 6 kg
m = 0.33 mol/kg
What does the speed of a sound depend on?
A.
the medium through which it travels
B.
the source from which it is emit
C.
the volume of the sound
D.
the pitch of the sound
Answers
A very loud sound has a high _____.
resting point
amplitude
wavelength
bass
Answers
Answer:
Resting Point
Explanation:
Answer: amplitude
Explanation:
explain why you need both muscles and bones to move your body.
Answers
Answer:
i dont need
Explanation:
do u know ......
GIVING BRAINLIST TO BEST ANSWER! How does Bohr’s model of the atom compare with Thomson’s model?
A) They both describe atoms as small, indivisible spheres.
B) They both describe electrons as moving around the nucleus.
D) They both describe electrons as being surrounded by the positive matter.
C) They both describe atoms as being made up of positive and negative matter.
Answers
Answer:I say C .. u should give the other person Brainliest bc they had a fully answer!
Explanation:
Answer:
d on brainly
Explanation:
i just took the exam
Which statement best describes the relationship between photosynthesis and cellular respiration?
Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere.
Photosynthesis is part of the carbon cycle, and cellular respiration is not.
Only plants perform photosynthesis, and only animals perform cellular respiration.
Photosynthesis releases carbon into the atmosphere, and cellular respiration removes carbon from the atmosphere.
Answers
Answer:
Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere.
Explanation:
The first option clearly expresses the relationship between photosynthesis and cellular respiration.
Cellular respiration releases carbon back into the atmosphere whereas photosynthesis removes the carbon from the atmosphere.
Photosynthesis is the process whereby green plants manufacture their food using carbon dioxide and water.
In cellular respiration, the product of the photosynthesis is used by organisms to produce energy.
Which statement below is TRUE about COMPOUNDS? *
a) Compounds are made up of the same type of atoms.
b) Compounds are made up of only 1 atom.
d) Compounds are made up of different atoms stuck together.
d) Compounds can only contain 2 atoms.
Answers
Please help, How would you define what a chemical reaction and an equation is? Give an example.How would you know if a chemical reaction is balanced? Give an example.
Answers
Answer:
A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.
Explanation:
In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia.
Please pls help ASAP
Answers
Answer:
??
Explanation:
I can't tell, you don't have the answer choices up I can't see them
what are the in the drop-down boxes?
What are the three eras in the geologic time scale? *
Answers
the Mesozoic
the Cenozoic
PLS HELP!!!!! WILL GIVE BRAINLIEST, 5 STARS, AND THANKS!!!!!!!!!!
Which reactions are the reverse of one another?
condensation and addition
addition and elimination
elimination and condensation
substitution and addition
Answers
Answer:
it has to be b
Explanation:
the other ones don't make any sense
In an experiment, potassium chlorate decomposed according to the following chemical equation.
2 KClO3 → 2 KCl + 3 O2
If the mass of potassium chlorate was 240 grams, what is the mass of oxygen gas formed?
Answer Choices:
A)
94.03g
B)
1378g
C)
41.8g
D)
612.5g
Answers
Please help me!!! 12 points :)
Answers
how molecules react to an increase in temperature.
Answers
Answer:
An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. 17.5 “Temperature and Reaction Rate”).
Explanation:
*
How do you identify forces in a diagram
sun
arrow
moon
O
Mars
Answers
DENSITY CHEMISTRY WORD PROB I WILL MARK BRAINLIEST PLEASE HELP I NEED ASAP
Answers
Answer:
The number of passengers that the Embraer E170 could carry if its fuselage was made of steel is 39 passengers
Explanation:
The given parameters of the cylinder representing the fuselage are;
The length of the cylinder, l = 30.0 meters
The width of the cylinder, w = 2.5 meters
The thickness of the cylinder, t = 2.5 mm = 0.0025 meters
The volume of the metal required to make the fuselage cylinder, V = (π·w²/4 - π·(w - 2·t)²/4) × l
Therefore, by substituting the known values, we have;
V = (π × 2.5²/4 - π×(2.5 - 2×0.0025)²/4) × 30 = 0.58845957392
The volume of the metal required to make the fuselage cylinder, V≈ 0.58846m³
The given density of steel = 7.87 g/cm³ = 7870 kg/m³
The given density of aluminum = 2.70 g/cm³ = 2,700 kg/m³
Mass = Density × Volume
The mass of the fuselage made with steel = The given density of steel × The volume of the metal required to make the fuselage cylinder
∴ The mass of the fuselage made with steel = 7870 × 0.58846 ≈ 4631.18
The mass of the fuselage made with steel ≈ 4631.18 kg
Similarly, the mass of the fuselage made with aluminum = 2,700 × 0.58846 ≈ 1588.84
The mass of the fuselage made with aluminum ≈ 1588.84 kg
The total mass the Embraer E170 could carry = The mass of the fuselage made with aluminum + The mass of the 78 passengers
The average mass of each passenger = 79 kg
∴ The total mass the Embraer E170 could carry ≈ 1588.84 + 78 × 79 = 7750.84
The total mass the Embraer E170 could carry ≈ 7750.84 kg
The extra mass the Embraer E170 could carry when made of steel = (The total mass the Embraer E170 can carry) - (The mass of the fuselage made with steel)
∴ The extra mass the Embraer E170 could carry when made of steel = 7750.84 - 4631.18 = 3119.36
The extra mass the Embraer E170 could carry when made of steel ≈ 3119.36 kg
The number of passengers the Embraer E170 could carry when made of steel = (The extra mass the Embraer E170 could carry when made of steel)/(The average mass of one passenger)
∴ The number of passengers the Embraer E170 could carry if its fuselage was made of steel = 3119.36 kg/(79 kg/passenger) ≈ 39.489 passengers
The number of passengers that the Embraer E170 could carry if its fuselage was made of steel ≈ 39 passengers (we round down when counting people which are whole quantities)
Calculate the pH of the following?
a) 0.12 M NaNO2
b) 0.10 M CH3NH3Cl
c) .45 M NaOCl?
Answers
Seawater is an example of a _______ solution
a Liquid in gas
b Gas in liquid
C Solid in liquid
d Liquid in liquid
Answers
Answer:
C. Solid in liquid
Explanation:
Seawater is an example of a solid in liquid solution.
Sea water is made up of:
water mineral salts dissolved gasesA liquid solution is always made up of a solute being dispersed within the solvent medium.
The solvent is the liquid or fluid medium.
Such solutions are homogeneous because the solute particles are distributed evenly or uniformly in the solvent.
The solute is usually present in smaller amount compared to the solvent.
What is the molar mass of KNO3?
Answers
Answer:
K=39, N=14, O=16. So molar mass of KNO3= 39+14+3(16)= 101
Im Wrong?
plss help . i have no idea
Answers
Answer:
Protons and Neutrons have approximately the same mass.
Equal numbers of protons and electrons make an atom neutral.
Protons have a positive charge
Explanation:
Protons and Neutrons have approximately the same mass. - both are 1 amu
Equal numbers of protons and electrons make an atom neutral. - protons are +1 and electrons are -1, so they cancel each other if there are equal amounts.
Protons have a positive charge - this is true.
Which of the following empirical formulas is written correctly? *
Answers
A sample of oxygen gas has a volume of 150 mL when its pressure is 0.587 atm at 155 K. If the pressure and temperature are increased to STP, what will the new gas volume be?
Answers
Answer:
V₂ = 155.17 mL
Explanation:
Given data:
Initial volume = 150 mL
Initial pressure = 0.587 atm
Initial temperature = 155 K
Final temperature = 273.15 K
Final volume = ?
Final pressure = 1 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 0.587 atm × 150 mL × 273.15 K / 155 K × 1 atm
V₂ = 24050.86 atm .mL. K / 155 K.atm
V₂ = 155.17 mL
guys please finnish thiissss
Answers
Answer:
1. H2O
2. Ba(OH)2
3. H2O
4. H2O
5. Ca(OH)2
6. H2O
Explanation:
Answer:
1. H2O
2. Ba(OH)2
3. H2O
4. H2O
5. Ca(OH)2
6. H2O
Explanation:
Hope this helps
How many moles in 13 grams of C 2 H6 ? show work
Answers
Answer:
0.43mole
Explanation:
Given parameters:
Mass of C₂H₆ = 13g
Unknown:
Number of moles = ?
Solution:
To solve this problem we need to first find the molar mass of the given compound.
Molar mass of C₂H₆ = 2(12) + 6(1) = 30g/mol
So;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Number of moles = [tex]\frac{13}{30}[/tex] = 0.43mole
A. Neutrons and electrons
B. Protons and electrons
C. Electrons in energy levels
D. Protons and neutrons
Answers
Answer:
D.
Explanation:
Because protons and neutrons make up the mass of an atom.
How to calculate the number of molecules in 18g of H2O
Answers
We, know molecular mass of water is, M = 16 g/mol .
Given mass of water, m = 18 g.
We know, number of moles is given by :
[tex]n = \dfrac{18\ g}{16 \ g/mol}\\\\n = 1.125\ moles[/tex]
Now, 1 mole of any compound contains 6.022 × 10²³ molecules.
So, number of moles in 1.125 moles of water is 1.125 × 6.022 × 10²³ =
6.77 × 10²³ molecules.
Hence, this is the required solution.
Which of the following reactions is irreversible?
A. Zinc (Zn) reacting with hydrochloric acid (HCl)
B. Haber Process
C. Dehydrating copper sulfate (CuSO4)
D. Thermal decomposition of NH4Cl
PLEASE HELP
Answers
Answer:
A. Zinc (Zn) reacting with hydrochloric acid (HCl)
Explanation:
The reaction of Zinc with hydrochloric acid is an irreversible chemical process.
What makes a reaction reversible;
it must be involved in reversible chemical processes, no matter how small the extent of the reversibility. the rate of forward reaction must be equal to the backward one.So, hydrochloric acid when reacting with Zinc will give a complete chemical change that will go into completion.
Answer:
(A): Zinc (Zn) reacting with hydrochloric acid (HCI)
Explanation:
I got it right on founders edtell
I don’t know this and I need help help me
Answers
HELP PLEASE!!!!!!
“Andy was drawing
of his circuit. When
asked to explain it,
he said, “This is an
example of a
perpendicular
circuit. The light on
the left will be
brighter because
there is less wire."
Is he correct?”