You need to make an aqueous solution of 0.150 M sodium fluoride for an experiment in lab, using a 500 mL volumetric flask. How much solid sodium fluoride should you add?
Answer:
Explanation:
Solution required is .15 M 500 mL sodium fluoride .
molecular weight of sodium fluoride = 42
one mole of sodium fluoride = 42 grams
No of moles contained in the solution of .15M , 500 mL solution
= .15 x 0.5 moles = .075 moles
1 mole = 42 g
.075 moles = .075 x 42 = 3.15 grams .
So mass of sodium fluoride required = 3.15 g .
1. A dry, empty bottle is placed in an ice bath. After the air inside the bottle is cooled off, a balloon is placed
over the opening. The bottle with the balloon is then placed in very hot water and the balloon inflated. Why
did the balloon inflate?
Answer:
hot air rises and expanded the balloon
Explanation:
thats it.
Which ion forms the strongest ionic bond with a given anion?
Answer:
Explanation:
A cation with a 2+ charge will make a stronger ionic bond than a cation with a 1+ charge. A larger ion makes a weaker ionic bond because of the greater distance between its electrons and the nucleus of the oppositely charged ion.
why do astronauts on the moon seem like they're "Walking on springs" while on earth we are firmly attached to the ground
When a compound such as X2Z4 is created, what would be the
correct simplified chemical formula?
Answer:
XZ2
Explanation:
There are different ways in which compounds can be represented. Broadly, we have three different types of formula;
- Structural formular: This shows how th atoms in te compound are connected to each other.
- Molecular formular: This shows the actual number of atoms of element present in the compound
- Empirical Formular: This is the simplest formular of a compound. It basically shows the number of atoms in simple ration to each other.
This question requires us to input the empirical formular;
X2Z4
The ratio of the elements is; 2 : 4 which can be simplified into 1 : 2
This means the empirical formular is XZ2
36.0 g of Be contains how many moles?
Answer:
Explanation:
4
how does the concentration of sodium thiosulphate affect the rate of reaction in between hydrochloric acid and sodium thiosulphate
Answer: C
Explanation:
I know because i did it.
Some students believe that teachers are full of hot air. If I inhale 2.1 liters of gas at a temperature of 200 C and it heats to a temperature of 370 C in my lungs, what is the new volume of the gas?
Answer:
2.86L
Explanation:
Given parameters:
V1 = 2.1L
T1 = 200°C = 200 + 273 = 473K
T 2 = 370°C = 370 + 273 = 643K
Unknown:
V2 = ?
Solution:
Since pressure is constant, we apply the Charles's law;
[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
V is volume
T is the temperature
1 is the initial state
2 is the new state
[tex]\frac{2.1}{473}[/tex] = [tex]\frac{V2}{643}[/tex]
V2 = 2.86L
Low, gray, layered clouds that cover the sky and bring steady rain are O A. cumulus O B. cirrus O C. cumulonimbus OD. nimbostratus
Answer:
D Nimbostratus
Explanation:
6.900x10^10 ÷ 4.000x10^8
Answer:
1.725e+18
Explanation:
Do the following ! I'LL MARK THE BRAINLEST!
ITS SCIENCE!
Answer:
it's easier to look it up
Explanation:
Is water a reactant or product?
Answer: Reactant
Explanation:
In simple wording, Water act as a reactant and it broke or we can say split the larger molecule in the smaller ones, The H and OH bonds are attached to the two products that are formed after the reaction. Another process in which water is used as an important reactant is photosynthesis.
3. A sample of neon gas has a volume of 1.2 L at 28.5°C. What will the volume be at 125°C it the
pressure remains constant?
Answer:
1.58L
Explanation:
Given parameters:
Initial volume = 1.2L
Initial temperature = 28.5°C = 28.5 + 273 = 301.5K
Final temperature = 125°C = 125 + 273 = 398K
Unknown:
New volume = ?
Solution:
Volume and temperature relationship is resolved using the Charles's law.
The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the the pressure is constant".
So;
[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
V1 is the initial volume
T1 is the initial temperature
V2 is the new volume
T2 is the new temperature
[tex]\frac{1.2}{301.5}[/tex] = [tex]\frac{V2}{398}[/tex]
301.5V2 = 477.6
V2 = 1.58L
10. There are two bears that both have the same proteins for ear shape in their cells. The bears have
different parents. What can you say about the bears' ear shape?
Answer:
They will have the same ear shape since their proteins connect in the same ways to determine ear shape.
Explanation:
I majored in Chemistry
Answer:
They will have the same ear shape since their proteins connect in the same ways to determine ear shape.
Explanation:
Energy of motion is called ________energy *
Answer:
Kinetic - Kinetic energy is the energy of motion
Explanation:
Thermal energy - heat energy
Potential energy - energy that is stored
Hope this helped!
Have a supercalifragilisticexpialidocious day!
An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its
mass
The mass of an object is the product of its volume and density. The mass of a the object with a volume of 825 cm³ and a density of 13.6 g/cm³ is 11220 g.
What is density ?Density of substance is the measure of its mass per unit volume. It describes how closely its particles are packed. Density depends on the bond type, temperature and pressure.
Volume of the object is the space occupied by its particles. Volume can be expressed in L, ml, cm³, dm³ etc. Only solids and liquids has a definite volume and the volume of gases is that of the container.
Give that, volume of the object = 825 cm³
density = 13.6 g/cm³
Mass = volume × density
m = 825 cm³ × 13.6 g/cm³ = 11220 g
Therefore, the mass of the object is 11220 g.
Find more on density:
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What does microbiome do to your cells?
The proton number of barium (Ba) is 56. It is in Group II of the periidic table how many electrons would you expect a barium atom to contain in its outer energy level?
Answer:
A barium atom would be expected to contain 2 electrons in its outer energy level.
Explanation:
The columns of the periodic table are called groups. There are eighteen groups, numbered from 1 to 18.
The elements of each group have the same number of electrons in their last atomic shell, which is why they have similar chemical properties, because the chemical properties of chemical elements are strongly related to the electrons located in the last atomic shell.
That is, in a group, the chemical properties are very similar, because all the elements of the group have the same number of electrons in their last or last shells.
A barium atom would be expected to contain 2 electrons in its outer energy level.
How many grams of NH3 are needed to make 2.50 moles of (NH4)2SO4?
2 NH3(g) + H2SO4(aq) --> (NH4)2SO4(aq)
Answer:
85.155g NH3
Explanation:
Which of the following is not a unit of volume?
A
L
B
mL
C
m^3
3
D
cm^2
2
PLEASE ANSWER ASAP !! NEED THIS HANDED IN TN
Answer:
The orest one is possible D
Explanation:
The complete combustion of acetic acid, HC2H3O2(I) to form water, H2O(I), and CO2(g), at constant pressure releases 871.7 kJ of heat per mol of acetic acid.
Write a balanced thermochemical equation if 5.0g of acetic acid will be used in the reaction.
HC2H3O2(I) + O2 --- H2O(I) + CO2(g) H= -871.7 kJ
Answer:
HC2H3O2(I) + O2(g) ---> H2O(I) + CO2(g) ΔH= -72.35 kJ
Explanation:
We know that 5.0 g of acetic acid will contain, 5.0g/60 g/mol = 0.083 moles of acetic acid
Now from the reaction equation;
1 mole of acetic acid evolved -871.7 KJ of heat
0.083 moles of acetic acid will evolve 0.083 * -871.7 = -72.35 KJ
For 5.0 g of acetic acid, we can write;
HC2H3O2(I) + O2(g) ---> H2O(I) + CO2(g) ΔH= -72.35 kJ
C3Hg + 02 → CO2 + H2O
This chemical equation represents the combustion of propane. When correctly balanced, the coefficient for water
is
16.
2.
8.
4.
Answer:
4
Explanation:
The following equation, which depicts the combustion of propane, is given in this question as follows:
C3H8 + 02 → CO2 + H2O
However, this equation is not yet BALANCED because the number of atoms of each element is not the same on the reactant and product side. To balance the equation, we make use of COEFFICIENT to ensure that the number of atoms of each element on both side correlates.
The balanced equation is as follows:
C3H8 + 502 → 3CO2 + 4H2O
Therefore, the coefficient for water (H2O) after balancing the equation is 4.
The study of chemicals is called chemistry.
The correct answer is D.
The equation is not yet BALANCED because the number of atoms of each element is not the same on the reactant and product sides.
To balance the equation, we make use of COEFFICIENT to ensure that the number of atoms of each element on both sides correlates.
After balancing the equation is as follows:
[tex]C_3H_8 + 50_2 → 3CO_2 + 4H_2O[/tex]
Hence, the correct answer is 4 which shows the balanced water.
For more information, refer to the link:-
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How many grams are in 25.0 moles of carbon tetrachloride (CCI)?
Answer:
3.84 kg
Explanation:
CCl4 molar mass: 153.82 g/mol
n = mass / molar mass
25 moles = mass / 153.82 g/mol
mass = 25 x 153.82
mass = 3845 g or 3,84 kg
Hydrazine, N2H4, and hydrogen, H2O2, have been used as rocket propellants. They react according to the equation:
H2O2 + N2H4 → N2 + H2O
a. How many moles of N2 are formed from 0.0250 moles of N2H4? (0.0250)
b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced? (0.675)
c. How many moles of H2O are formed if 1.87 moles of N2 is produced? (7.48)
Explanation:
The equation of the reaction is;
H2O2 + N2H4 → N2 + H2O
Upon balancing the reaction, we have;
N2H4 + 2H2O2 → N2 + 4H2O
a. How many moles of N2 are formed from 0.0250 moles of N2H4?
From the equation of the reaction;
1 mol of N2H4 produces 1 mol of N2
0.0250 mol of N2H4 would produce x mol of N2
1 = 1
0.0250 = x
x = 0.0250 * 1 / 1 = 0.0250 mol
b. How many moles of H2O2 are required if 1.35 moles of H2O is to be produced?
From the equation of the reaction;
2 mol of H2O2 produces 4 mol of H2O
x mol of H2O2 produces 1.35 mol of H2O
2 = 4
x = 1.35
x = 1.35 * 2 / 4 = 0.675 mol
c. How many moles of H2O are formed if 1.87 moles of N2 is produced?
The relationship between H2O produced and N2 is;
For every 1 mol of N2 produced, 4 mol of H2O is produced
1.87 mol of N2 produced, how many moles of H2O is produced?
1 = 4
1.87 = x
x = 1.87 * 4 / 1 = 7.48 mol
would using a strainer be filtration?
Answer:
To some extent, yes
Explanation:
Base changes phenolphthalein to pink it is true or false
Answer:
It’s false
Explanation:
it could be true if the question mentioned alkaline solution
Answer:
True
Explanation:
Phenolphthalein is colorless in the presence of an acid and turns pink in the presence of a base.
Predictions about the future based on the position of planets is an example of physics biology earth science pseudoscience
Answer:
Pseudoscience
Explanation:
Predicting the future based solely on the position of the planets is an example of pseudoscience.
Pseudoscience is a body of knowledge that is not based on the scientific method but on some unverifiable/unprovable claims.
Predictions about the future can only be valid if it is based on the scientific method, not just about the position of the planet. The scientific method involves observation, hypothesis formulation, testing of the hypothesis through repeatable experiments, and arriving at conclusion.
Any other statement or belief that is not based on these procedures is said to be pseudoscientific.
Answer:
The answer to your question is pseudoscience.
Explanation:
I took the module 1 exam and got it right, yesterday.
Identify the reaction type shown and describe the clues that were used to identify it.
NH4NO3 → N2O + 2H2O
Answer:
This chemical equation represents a decomposition reaction. This identification is based on the fact that the single reactant chemical compound breaks down into two different chemical substances that are different from the initial chemical substance.
Explanation:
it was the sample response lol
A reactant is broken down into two or more products in the decomposition reaction. The given reaction is a decomposition reaction.
Decomposition reaction:
In this type of chemical reaction, a reactant is broken down into two or more products.
For example- Ammonium nitrate is broken down into nitrous oxide and water molecules.
[tex]\bold {NH_4NO_3 \rightarrow N_2O + 2H_2O}[/tex]
Therefore, the given reaction is a decomposition reaction.
To know more about Decomposition reaction:
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show how to work out...Calculate the mass in grams of 3.50 x 1025 atoms of lithium. Answer: 404g Li
what is rusting of iron?
Answer:
Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Unlike rust, which can flake off the surface of iron and steel objects, the layer of aluminium oxide does not flake off.
Explanation:
