Answer:
Example
0.5 mol of sodium hydroxide is dissolved in 2 dm3 of water. Calculate the concentration of the sodium hydroxide solution formed.
Concentration =
Concentration = 0.25 mol/dm3
Volume units
Volumes used in concentration calculations must be in dm3, not in cm3. It is useful to know that 1 dm3 = 1000 cm3. This means:
divide by 1000 to convert from cm3 to dm3
multiply by 1000 to convert from dm3 to cm3
For example, 250 cm3 is 0.25 dm3 (250 ÷ 1000). It is often easiest to convert from cm3 to dm3 before continuing with a concentration calculation.
Question
100 cm3 of dilute hydrochloric acid contains 0.02 mol of dissolved hydrogen chloride. Calculate the concentration of the acid in mol/dm3.
Reveal answer
Converting between units
The relative formula mass of the solute is used to convert between mol/dm3 and g/dm3:
to convert from mol/dm3 to g/dm3, multiply by the relative formula mass
to convert from g/dm3 to mol/dm3, divide by the relative formula mass
Remember: the molar mass is the Ar or Mr in grams per mol.
Example
Calculate the concentration of 0.1 mol/dm3 sodium hydroxide solution in g/dm3. (Mr of NaOH = 40)
Concentration = 0.1 × 40
= 4 g/dm3
please respond and help if you’re able to
Write out the balanced chemical equation for the reaction for when phosphate calcium reacts with lead chloride
Answer:
Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
(b) Zinc + Silver nitrate → Zinc nitrate + Silver
(c) Aluminium + Copper chloride → Aluminium chloride + Copper
(d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chlorid
Explanation:
The Second Law of Thermodynamics makes it difficult for scientists to explain how the original universe became ordered.
TrueFalse
Answer:
True :)
Explanation:
What is the mass of 500 mL of
1.0 M of H2O?
Answer:
In order to obtain a volume of
1 L
,
500 mL
of water must be added to the original solution of
500 L
.
Explanation:
What risks does nuclear waste pose to Earth or the sun or outer space?
Answer:
It could pollute other planets. Nuclear waste might be attracted by the gravitational pull of the sun and disintegrate there instead. The waste storage spacecraft could crash into a planet, moon, or another astronomical body. It could be dangerous for other life forms out there.
Explanation:
What type of solution do you create if you put 50g of NH4Cl in 100g of water at 70 degrees C
Answer:
hi
Explanation:
Is freezing point depression a colligative property?
Answer:
Yes it is a colligative Property
Explanation:
There is freezing point depression, boiling point elevation, Osmotic Pressure, Vapor Pressure Lowering
A container of 56mL is at STP, The pressure is increased to 3.6atm and the volume to 162 mL.
What is the new temperature?
Answer:
T2 = 2843.1 oK. This is a huge temperature. Check it for errors.
Explanation:
Remark
This is the same question as the other one I've answered. Only the numbers have been altered.
Givens
v1 = 56 mL
P1 = 1 atm
T1 = 273o K
v2 = 162
P2 = 3.6 atm
T2 = ?
Formula
Vi * P1 / T1 = V2 * P2/T2
Solution
Rearrange the formula so T2 is on the left
T2 = V2 P2 * T1 / (V1 * P1) Now just put the numbers in.
T2 = 162 * 3.6* 273 / (56 *1)
T2 = 159213.6/56
T2 = 2843.1
How many atoms of Ca are in 1.65 mol of Ca?
Answer:
40.078 atomic mass units
Explanation:
If a solution is saturated and more salt that is added falls to the bottom of the container what is it called?
A: Supersaturated
B: Saturated
C: Unsaturated
Answer:
The answer is B
Explanation:
A solution that contains a relatively low concentration of solute is called dilute, and one with a relatively high concentration is called concentrated. If we add more salt to a saturated solution of salt, we see it fall to the bottom and no more seems to dissolve.
Why burning of fuel is a chemical change give 5 reasons to support your answer
Answer:
Explanation:
1. New substances such as carbondioxide and water is formed.
2. There is evolution of gas bubbles. Gases are released.
3. There is either the absorption of energy or release of energy in form of light and energy.
4. The reaction is irreversible i.e it cannot be reversed, it is permanent once the reaction take place.
5. There is a change in both odor and smell.
A chemical change is a change where new substances are formed due to changes in the properties.
What is used up in and stops a chemical reaction?
Answer:What is used up in and stops a chemical reaction? (a) percent yield (b) limiting reactant (c) theoretical yield (d) excess reactant
The correct option is (b)
Explanation:
A chemical reaction is a chemical combination,rearrangement or disintegration of chemical substance(s) (called reactants) to form new chemical substance(s) (called products).
A limiting reactant is the reactant that is totally used up during the course of a reaction. When this reactant is used up, it limits the amount of products formed and eventually stops the chemical reaction.
Explanation:
The limiting reagent is the reactant that is used up completely. This stops the reaction and no further products are made. ... This method is most useful when there are only two reactants. The limiting reagent can also be derived by comparing the amount of products that can be formed from each reactant.
hope this helps have a nice day❤️
Aqueous sodium hydroxide reacts with carbon dioxide gas to yield soluble sodium carbonate and liquid
water. What is the chemical equation?
Explanation:
i have done
see the picture
and please mark me brainiest
Draw electron-dot structure of cyclohexane.*
Answer:
Draw the example below
Hope this helps
Hope it helps.
If you have any query, feel free to ask.
Write a story about a family who uses a solar cooker and to stay healthy and safe.
b) Explain the importance of photosynthesis for plants.
Answer:
Green plants and trees use photosynthesis to make food from sunlight, carbon dioxide and water in the atmosphere: It is their primary source of energy. The importance of photosynthesis in our life is the oxygen it produces. Without photosynthesis there would be little to no oxygen on the planet.
What does the second quantum number (1) describe?
The second quantum number (l) describes which sublevel the electron is in
How does the length of a lunar month compare to the average length of a month in a standard 365-day calendar?
What will most likely happen to the Sun in the future?
A. The Sun will burn away most of its fuel and become a red giant star.
B. The Sun will collapse and become a large planet like Jupiter.
C. The Sun will become a giant collection of gas and dust called a nebula
D. The Sun will cool to become a blue dwarf.
Answer:
b
Explanation:
because the sun it's already the biggest planet
What is wind?
..........:..............
Answer:
um air-
Explanation:
something in the air u welcome
PLEASE HELP PRONTO PLEASE
Roots absorb the water they need for photosynthesis through tiny outgrowths called ______________
Answer:
The correct answer is - root hairs.
Explanation:
Root hairs or absorbent hair are the very small tubular outgrowth present in the epidermis of the roots of the plant that helps plants in absorbing the water from the soil pores into the plants. Water is an essential reactant in the photosynthesis process.
By their elongation increases the surface of exchange between plants and soil for better absorption. The major function of the root hairs to absorb the water and the nutrients from the soil to the plant.
How many grams of aluminum is produced when 82.4 grams of aluminum chloride
decomposes into chlorine gas and aluminum metal?
2AICI: - 2 Al + 3C12
Answer:
16.6 g of Al are produced in the reaction of 82.4 g of AlCl₃
Explanation:
Let's see the decomposition reaction:
2AlCl₃ → 2Al + 3Cl₂
2 moles of aluminum chloride decompose to 2 moles of solid Al and 3 moles of chlorine gas.
We determine the moles of salt:
82.4 g . 1mol/ 133.34g = 0.618 moles
Ratio is 2:2. 2 moles of salt, can produce 2 moles of Al
Then, 0.618 moles of salt must produce 0.618 moles of Al.
Let's convert the moles to mass → 0.618 mol . 26.98g /mol = 16.6 g
Cell theory states:
l.All living cells must have a cell wall.
ll.All living cells require glucose for survival
lll.A cell is the basic unit of life.
A. l only
B.ll only
C.lll only
D. l and lll
Answer:
C
Explanation:
cell theory states:
all living things are made of 1 or more cells
all cells come from pre-existing cells
the cell is the basic unit of structure
What are the three (3) things involved in stoichiometry problems???
Answer:
Molar Mass (moles
⇌
grams)
Stoichiometric Coefficients (moles )
Avagadro's number
Explanation:
When naming the second nonmetal in a covalent molecule, the numerical value is indicated by a __.
Answer:
roman numeral
Explanation:
How much carbon dioxide will be formed if 12.5 grams of oxygen reacts with 7.2 grams of propane (C3H8 )? Balanced equation: C3H8 + 5 O2→ 3 CO2 + 4H
Answer:
10.3125 grams of carbon dioxide will be formed.
Explanation:
The balanced reaction is:
C₃H₈ + 5 O₂→ 3 CO₂ + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles participate in the reaction:
C₃H₈: 1 mole O₂: 5 molesCO₂: 3 moles H₂O: 4 molesBeing the molar mass of the compounds:
C₃H₈: 44 g/mole O₂: 32 g/moleCO₂: 44 g/moleH₂O: 18 g/molethen by stoichiometry of the reaction, the following amounts of mass participate in the reaction:
C₃H₈: 1 mole* 44 g/mole = 44 gO₂: 5 moles* 32 g/mole= 160 gCO₂: 3 moles* 44 g/mole= 132 gH₂O: 4 moles* 18 g/mole= 72 gThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
To determine the limiting reagent, it is possible to use a simple rule of three as follows: If by reaction stoichiometry 44 grams of propane react with 160 grams of oxygen, 7.2 grams of propane react with how much mass of oxygen?
[tex]mass of oxygen=\frac{7.2 grams of propane*160 grams of oxygen}{44 grams of propane}[/tex]
mass of oxygen= 26.18 grams
But 26.18 moles of O₂ are not available, 12.5 grams are available. Since you have less mass than you need to react with 7.2 grams of propane, oxygen O₂ will be the limiting reagent.
Then you can apply the following rule of three: if by stoichiometry of the reaction 160 grams of oxygen form 132 grams of carbon dioxide, 12.5 grams of oxygen will form how much mass of carbon dioxide?
[tex]mass of carbon dioxide=\frac{12.5 grams of oxygen*132 grams of carbon dioxide}{160 grams of oxygen}[/tex]
mass of carbon dioxide= 10.3125 grams
10.3125 grams of carbon dioxide will be formed.
A pure substance is a substance that has only 1 type of atom or molecule
True
or
False
Which of the substances has a higher boiling point: H20 or H2S? Justify your
answer in detail.
Your answer
Which of the substances has a higher boiling point: NaCl or HF? Justify your
answer in detail.
pls answer i will mark as branliest im timed
Answer:
H2O
Explanation:
Water has a higher b.p because it contains hydrogen bonding which is stronger than than the dipole-dipole bonds in hydrogen sulfide
.What is the KE of a baseball that has a mass of 100 kg and is traveling at 5 m/s?
Answer:
1250joules
Explanation:
The kinetic energy is energy in motion and it's formula is
KE =1/2MV^2
M represent mass which is 100Kg.
V represent velocity which is 5m/s
Therefore, KE = 1/2×100×5× 5
= 50 × 25
KE= 1250joules
7. Which of the following compounds is the most soluble in water?
O propanoic acid
O l-bromopropane
O propanal
O propane
Answer:
propanoic acid
Explanation:
i hope this helps!