Answer:
3 to 4 days is how long you can keep cooked beef in the refrigerator
Deadline homework if someone could this I make u a brainlist. Thanks
how many iron atoms are there in 5.33 mol of iron(iii) chloride
Answer:
The formula shows that there is one atoms of iron in each formula unit of FeCl3, and by definition the number of molecules or formula units in a mole is Avogadro's Number. Therefore, 5.33 moles contains 5.33 X Avogadro's Number of atoms, which is 3.21 X 1024 atoms, to the justified number of significant digits.
Answer:
The formula shows that there is one atoms of iron in each formula unit of FeCl3 , and by definition the number of molecules or formula units in a mole is Avogadro's Number . Therefore , 5.33 moles contains 5.33 X Avogadro's Number of atoms , which is 3.21 X 1024 atoms , to the justified number of significant digits .
How many liters of solvent would be needed to create a 5.5 M solution from 22 moles of sodium chloride?
According to molar concentration, four liters of solvent would be needed to create a 5.5 M solution from 22 moles of sodium chloride.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters. Substitution of values in formula gives, volume= 22/5.5=4 liters.
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Does silver change color in the presence of poison.
lab report solubility edge
Answer:
i'm attaching the report i made
Explanation:
(It does include the chart information)
hope this helps! have a wonderful day :)
The solubility of a solid solute increases with temperature.
What is the effect of temperature on the solubility of a solute?The solubility of a solute is the amount of solute that dissolves in a given volume of solvent at a particular temperature.
The solubility of a solute increases with increase in temperature.
Based on the lab results, it was seen that with increase in temperature, the mass of sugar that dissolves in water increases.
50 mL of water at 2 °C dissolved only 80 g of sugar whereas at 102 °C, 250 g of sugar dissolved.
Therefore, it can be concluded that solubility of a solute increases with temperature.
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How many moles of oxygen will occupy a volume of 435 mL at 6780 torr and 28 °C?
Answer:
n = 0.157
Explanation:
To solve that question, we need to follow this equation: PV = nRT
V = 435ml (must be convert to L by ÷ by 1000) = 0.435 L
P = 6780 torr (must be convert to atm by ÷ by 760) = 8.92 atm
T = 28C (must convert to K by + 273.15) = 301.15 K
R = 0.08205
n = ?
PV = nRT
8.92 x 0.435 = n x 0.08205 x 301.15
3.88 = n x 24.7
Divided both sides by 24.7 (left n)
3.88/24.7 = n
0.157 = n
So 0.157 is the answer!
A gas in a 3.5-L container has a pressure of 285 mm Hg. When the gas is transferred completely to a 750 mL container at the same emperalure, the pressure will be
Answer:
285
Explanation:
Which of the following are sources of chemical energy?
1. Batteries and food
2.Batteries and toasters
3. Fans and food
4. Food and toasters
The sources of chemical energy from the available options would be batteries and foods.
What is chemical energy?Chemical energy is a form of energy derived from the chemical properties of materials.
Most batteries contain chemicals that are able to ionize in solution to produce electric currents in circuits. Chemicals in batteries include sodium chloride, nitric acid, sulfuric acid, etc.
Foods contain chemicals that when hydrolyzed in the body, are able to produce energy to sustain the various processes in the body. The chemicals in foods are mostly carbohydrates.
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Please help me
A sample of a liquid with mass of 8.657g was decomposed into its elements and gave 5.217 g of carbon ,0.9620 g of hydrogen, and 2.478g of oxygen. What is the percentage composition of this compound
Answer:
The percent composition of a compound is the calculated measure of each ... A sample of a liquid with a mass of 8.657 grams was discovered into its elements ad gave 5.217 grams of carbon, 0.9620 grams of hydrogen, and 2.478 grams of oxygen. ... mass of oxygen = 2.478 grams ... 14.01 g/mol x100 = 3.03 g/mol x 100.
Hope this helps, please let me know If I'm wrong.
2.a) when a bydrocarbon fuel is burnt, one of the main products is slightly acidic gas R Whats the name of gas R?
Answer:
Carbon and hydrogen atoms in the hydrocarbon fuel react with oxygen in an exothermic reaction. carbon dioxide and water are produced
can someone help me? i dont think i did this right..
Explanation:
wat exactly do u need to do here?
As the rate of physical weathering increases, the amount of chemical weathering also increases because
Answer:
Hehe!
Explanation:
Because Increased surface area provides more surface for chemical weathering to attack the rock,allowing chemical weathering to speed up.
The reaction below proceeds spontaneously at 298 K. NH3(g) Cl2(g)Right arrow. NH4Cl(s) What is the sign of the entropy change, Delta. S? Delta. S is negative because the product is less random than the reactants. Delta. S is negative because the reactants are less random than the product. Delta. S is positive because the product is less random than the reactants. Delta. S is positive because the reactants are less random than the product.
A spontaneous reaction favours the product formation and increases the entropy of the isolated system. The sign of the entropy change will be negative as the product formation is less random.
What is entropy?Entropy is the degree of the disorder or randomness that occurs in the system that lacks available energy and cannot convert the mechanical energy or work.
The entropy of the reaction will be negative as the reactants are present in the gaseous state and the product formed is solid. The product formation was spontaneous and less random.
Therefore, option a. entropy will be negative as product formation is less random.
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what do i do can u help:)
Answer:
The locations of the volcanoes tend to be close/on the earthquake lines/zones and this is because earthquake activity forms mountains/volcanoes and also causes those volcanoes to erupt. The reason the earthquake zones are long lines is because earthquakes usually happen on fault lines, or where two tectonic plates are next to each other. These plates are like a jigsaw puzzle, as in, they are everywhere making up the pieces of the surface of the globe. So that's why they are long lines.
Which of the following is a measure of the randomness of a system?
O A. Heat
O B. Energy
O C. Efficiency
O D. Entropy
If you mix food dye with water, is that a physical change or chemical? (Cause my teacher said chemical)
Explanation:
well, I dunno if I'm correct but I think it's a physical change cause no new substance is formed
The largest source of background ionizing radiation in the United States is _____, which is formed in the decay series of uranium.
The correct statement will be"The largest source of background ionizing radiation in the United States is Radon (Rn)which is formed in the decay series of uranium."
What is the largest source of background ionizing radiation in the United States?Generally, Ionizing radiation is simply defined as a state of energy that works by releasing electrons from their parent atoms or the molecules of materials.
In conclusion, Radon (Rn) a chemical element of Group 18 in the periodic table is the largest source of background ionizing radiation in the United States.
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Using the formula M V1 = M2V2 , how many milliliters of a 2.50 M
hydrochloric acid solution is required to make 100.0 mL of a 0.750 M
solution?
1.88
333mL
300mL
30mL
Answer:30mL
Explanation:
If you add 2.50 with 0.750 divide that by 100 you would get 30.7 something without rounding it would be 30.
1. Destiny is working in the lab with a filter. She has a mixture of Aluminum Phosphate (AlPO4)
and water. She knows if she runs the mixture through her filter she will collect some solid
because
a. AIPO, is soluble in water
b. AIPO, is insoluble in water
c. AIPO, is attracted to the filter
d. Water is soluble in water
What are the characteristics of a fibrous root system? (Select all that apply.)
made up of many roots
made up of one large root
made up of thin roots
made up of branched roots
Answer:branched roots and thin roots and many roots
WILL GIVE BRAINLIEST
Which if the following help a tropical storm become a hurricane?
making landfall
a cold wind
an earthquake
warm water
Answer:
an earthquake
Explanation:
Why is calcium in group 2A if the modern periodic table
Burning hydrogen is an example of a chemical reaction. The reaction is
shown in the diagram. Which of the following sthtements about energy in
this reaction is the most accurate?
Answer:
Energy is absorbed
Explanation:
since 1932 i learn this
how many molecules of water are there in 8.050 x 10^3 grams of water
Answer:This is approximately 2.69 * 10^26 molecules.
Explanation:
i just know
Write the expressions for the equilibrium constants of the reactions below.
a.N2 () + 3H2 () ⇌ 2NH3 ()
b. Br2 () + H2 () ⇌ 2HBr ()
c.CO () + H2O () ⇌ H2 () + CO2 ()
Answer:
Hey Man I dont know the Answer Im really sorry
Explanation:
I took the test though
Why is this element considered
unreactive or inert?
P: 10
N: 10
Answer:
It is a noble gas.
Explanation:
The element in question is helium, a noble gas. It has a full shell of eight valence electrons like all the other noble gases, which means that it does not have to react with other elements in order to obtain a full octet of valence electrons. This means that it does not react with other elements.
what is hydrogen
who likes Black pink Dancer
i like lalalisa
Answer:
did u fr ask what hydrogen is its a chemical element
Explanation:
Hola Brainlians! I need your help in chemistry today
Question:-
Names and chemical formulas of all compounds formed by first 30 elements.
Note:-
In between these 30 elements ,there is carbon and hydrogen present who has infinite no of organic compounds .So just mentioning the common compounds
Here we go
Sodium chloride (NaCl)Lithium hydride(LiH)Methane(CH_4)Zinc sulphate (ZnSO_4)Ferus Ferric oxide(Fe_3O_4)Water(H_2O)Hydrochloric acid(H_2SO_4)Molybdenom oxide(Mo_2O_3)Cuprous oxide(Cu_2O)Potassium permanganate (KMnO_4)Potassium chloride (KCl)Magnesium oxide (MgO)Calcium hydroxide (Ca(OH)_2)Calcium oxide(CaO)Phosphorus pentachloride (PCl_5)Nitrous oxide (N_2O)Carbon dioxide (CO_2)Carbon monoxide (CO)Glucose(C_6H_12O_6)Baking soda(NaHCO_3)Which of the following substances dissolves most readily in water?
a. CH
c. NH3
b. BaSO4
d. CaCO3
Answer to all these questions...
Answer:
A. Atomic number is 8, mass number of M is 16
B. Oxygen, O
C. 8 valence electrons, valency is 2
Explanation:
A. Atomic number = proton number
M2- = 2 extra electrons after forming octet structure, so 10-2=8
8 corresponds to number of protons, so atomic number is 8.
Mass number is number of protons + neutrons = 8+8=16
B. 8 in periodic table corresponds to oxygen
C. Number of valence electrons in an oxide ion is 8, valency is two as it forms -2 charge