Answer:
The volume of the liquid should be measured before it is heated.
Explanation:
Because During an experiment to test how a variable changes a substance, it is important to first observe and record the characteristics of the substance before the variable is introduced. In this case, the variable is heat energy.
Why are coal, oil and natural gas called fossil fuels
Which object represents a heterogeneous
mixture
Answer:
oil and water
Explanation:
oil and water - When you put oil and water together they do not mix. Therefore, these are a heterogeneous mixture since they are two separate parts.
A \pu{1.60 g}1.60 g1, point, 60, space, g calcium supplement contains 37.8\%37.8%37, point, 8, percent \ce{Ca}CaC, a by mass. The calcium is present in the supplement as \ce{CaCO3}(s)CaCOX 3 (s) (molar mass \pu{100.09 g/mol}100.09 g/mol100, point, 09, space, g, slash, m, o, l). How many grams of \ce{CaCO3}(s)CaCOX 3 (s) are in the calcium supplement?
A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.
We want to calculate the mass of CaCO₃ in a 1.60 g supplement. We need to consider the following relationships.
The mass percent of Ca is 37.8%, that is, there are 37.8 g of Ca every 100 g of supplement.The molar mass of Ca is 40.08 g/mol.The molar ratio of Ca to CaCO₃ is 1:1.The molar mass of CaCO₃ is 100.09 g/mol.[tex]1.60gSup \times \frac{37.8gCa}{100gSup} \times \frac{1molCa}{40.08gCa} \times \frac{1molCaCO_3}{1molCa} \times \frac{100.09gCaCO_3}{1molCaCO_3} = 1.51gCaCO_3[/tex]
A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.
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A 1.60 g calcium supplement contains 37.8% Ca by mass. The calcium is present in the supplement as CaCO₃(s) (molar mass 100.09 g/mol). How many grams of CaCO₃(s) are in the calcium supplement?
Someone please help? I've had a go at this myself (see picture of working attached) but not sure where to go from there?
75ml of a solutipn of 0.1mol l-1 NaOH neutralises 25ml of a solution of an acid. The formula of the acid is HxA and the concentration of the acid is 0.1mol l-1. What is the value of x?
Answer:
75 ml of 0.1M base neutralizes 25 ml of 0.1M acid, which means the acid has 0.3 moles/L of H ion
but that means each molecule of the acid has 3 times as many H ions aH ions in a molecule of NaOH
which means the formula for the acid must be H3A and
the value of x in
HxA is 3
Explanation:
75ml of a solutipn of 0.1moL l-1 NaOH neutralises 25ml of a solution of an acid. The formula of the acid is HxA and the concentration of the acid is 0.1mol l-1. What is the value of x?
the concentration of both the and the base are the same at 0.1M
the base...NaOH has 0.1 moles/L of OH ion
75 ml of 0.1M base neutralizes 25 ml of 0.1M acid, which means the acid has 0.3 moles/L of H ion
but that means each molecule of the acid has 3 times as many H ions aH ions in a molecule of NaOH
which means the formula for the acid must be H3A and the value of x in
HxA is 3
what are the products of the reaction: Be(s)+ Cl2(g)⟶
Answer:
BeCl2
Explanation:
Be+Cl2=BeCl2
An exothermic reaction releases 86.5 kJ. How many kilocalories of
energy are released?
The small flag indicating wind direction on a station weather plot points in the direction that the wind is going.
True or False
Answer:
False
Explanation: The wind's direction is shown by a long shaft. it will point to the direction from which direction the wind is blowing.
What type of energy is best described as the energy required to break the bonds present in the reactants?
A
activation energy
B
potential energy
С
kinetic energy
D
thermal energy
hay
Answer:
b
Explanation:
Haty
The energy required to break the bond in the reactants is activation energy .
Hence, option (A) is correct answer.
What is Exothermic Reaction ?The chemical reaction which releases energy are known as exothermic reaction. Bond forming is exothermic process. Activation energy is needed to initiate the reaction. In exothermic reaction potential energy converted into kinetic energy.
What is Endothermic Reaction ?The chemical reaction which absorbs heat from the surrounding is known as endothermic reaction. Bond breaking is endothermic reaction. Activation energy is needed to initiate the reaction. In endothermic reaction kinetic energy converted into potential energy.
Thus, from the above conclusion we can say that The energy required to break the bond in the reactants is activation energy .
Hence, option (A) is correct answer.
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#SPJ2
Mixture of a 25.00 mL aliquot of the sample solution with 5.00 mL of a 0.250 ppm warfarin standard yielded a solution with an intensity of 670. Calculate the percentage of warfarin in the sample.
Answer:
750
Explanation:
Ba(ClO 4 ) 2 (aq)+K 2 SO 4 (aq) -> BaSO 4 (s)+2 KClO 4 (aq)
Write the complete ionic equation
Answer:
sorry di ko alam
Explanation:
What happens to the pH of a solution is the concentration of hydronium ions decrease
What is the mole ratio between FeCl3 and Fe(C5H7O3)3 ?
Answer: 162.2 g FeCl3. mL of soln = 0.07028 mol FeCl3x ... mol FeCl3 = mol Fe(OH)3 = 0.01291 mol ... (a) MaVa = MbVb since HCl and KOH react in a 1:1 molar ratio.
Explanation:
A unit for measuring work is called the _____.
horsepower
effort
time
foot-pound
Answer:
A unit for measuring work is called the foot-pound
Read the etymology entry.
antagonize
antagonize (v.) 1630s, "to compete with" (obsolete); 1742, "act in opposition to, struggle against continuously,"
from Greek antagonizesthai "to struggle against, oppose, be a rival," from anti "against" (see anti-) + agonizesthai
"to contend for a prize," from agon "a struggle, a contest" (see agony). Meaning "make antagonistic" is by 1882.
What original language did the word antagonize come from?
O Greek
O Latin
O Middle French
O Middle English
Answer:
latin
Explanation:
im not sure sorry if wrong
Answer:
Greek
Explanation:
Mid 17th century (in the sense 'compete with'): from Greek antagōnizesthai, from ant- 'against' + agōnizesthai 'struggle' (see agonize).
How many moles of the excess reagent would there be if 2.8mol of N2 were reacted with 15.1mol of H2O?
N2+4H2O ---> 2H2O2+N2H4
The number of moles of the excess reagent there would be is 3.9 moles
From the question,
We are to determine the number of moles of the excess reagent there would be.
The given balanced chemical equation is
N₂ + 4H₂O → 2H₂O₂ + N₂H₄
This means,
1 mole of N₂ is required to react completely with 4 moles of H₂O
Now,
If 1 mole of N₂ is required to react completely with 4 moles of H₂O
Then,
2.8 moles of N₂ will react completely with 11.2 moles of H₂O
∴ H₂O is the excess reagent
Number of moles of H₂O that would remain = 15.1 mol - 11.2 mol
Number of moles of H₂O that would remain = 3.9 mol
Hence, the number of moles of the excess reagent there would be is 3.9 moles
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element Q,X, and Z are in the same group on the periodic table and are listed in order of increasing atomic number.The melting point of element Q is -219 Celsius and the melting point of element Z is -7 celsius. Which temperature is closest to the melting point of element X
Answer:
Very low ionization energy: metal bonds easily: group 1, or maybe 2 low melting.
Explanation:
giving brainly for correct answer! :)
Answer:
Mass is the amount of matter in an object
Answer:
Mass
Explanation:
matter is weighed by the mass of an object
A balloon contains 0.76 mol O2, 0.18 mol Ne, 0.031 mol Xe and 0.026 mol CO2 at 749 mm Hg. What is the partial pressure of Ne
Answer:
ans given below
Explanation:
To keep simplicity, let's assume these gases behave ideally so we can use the equations for ideal gas. One of these equation is the Raoult's Law written below.
P* = xP
This is another form of the Raoult's Law where x is the mole fraction. Let's find x for O2.
x = 0.18/(0.76+0.18+0.031+0.026) = 0.1805
Partial Pressure = (0.1805)(749 mmHg) = 135.23 mmHg
An element with 3 valence electrons would be a
0-3 anion
0 + 3 anion
+3 cation
0 - 3 cation
Answer:
0+3 anion
Explanation:
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.
what i compound is
FeI2
Answer:
iodide
Explanation:
Answer:
Iron(II) iodide
Explanation:
Can you force the atoms into new configurations by pushing atoms around? What does this suggest
about the configuration of atoms in real molecules?
What is the difference between Electron Geometry and Molecule Geometry?
In one or two grammatically correct sentences, write a definition for the term Molecule Geometry.
Answer:
Yes
Explanation:
By forcing the atoms into a new configuration is possible.
The addition of new atoms around the atom will change the electronic geometry of the atoms. The addition of electron-accepting or donating atoms will result in a change in configuration. The configuration change will result in the change in the hybridization of the atom, and it will acquire a new shape. The geometry of the molecule changes and it will acquire the lowest energy state.
This suggests that atoms in real molecules are present in the flexible state of configuration, and are at least energy, The change in the surrounding changes the configuration of the atoms, and are easily configured.
b) If 0.564 mol of S and 1.35 mol of Cl2 are reacted, which substance is the limiting reactant?
Answer:
what is the question
Explanation:
Which of the following corresponds to an alpha particle?
A. 1/4He
B. 3/2He
C. 2/2H
D. 4/2He
Answer:
D. 4/2 He corresponds to an alpha particle.
PLEASE HELP
What happens to light when it travels through a medium?
O it speeds up
O it slows down
O it gets hotter
o it gets colder
Answer:
The speed of light is constant and absolute and referenced to a vacuum. The speed at which light itself travels through different mediums changes.
Light travels slower through denser mediums. It travels slower through the air than it does in a vacuum. Slower again through glass than air, or water than air or glass.
can someone please help me i need this done rn
what is a nucleus and what are the functions?
When performing an experiment, the following footwear is best
Answer:
sneakers
Explanation:
Answer:
closed toe shoe
Explanation:
becusae if a cemcal spills it cant hurt your feet
what is the functional group and homologous series of ethyl butyrate?
Answer:
Functional group: ROR'
Homologous series: ester [C6H12O2]
Mark brainliest please
how do you separate the following mixture? Name only the process involved .
1.Sand and salt
Answer:
Just dissolve in water , you can separate
Explanation:
because salt dissolves in water but sand doesn't
Explanation:
sedinentation and decantation
The molarity of an aqueous solution of CaCl is defined as the
Answer:
Molarity of aqueous solution of CaCl2 can be defined as moles of CaCl2 per litre of solution
