This compound is also known as Calcium Oxide. The SI base unit for amount of substance is the mole. 1 grams CaO is equal to 0.017832495800447 mole. Note that rounding errors may occur, so always check the results.
Hope I helped :)
Something that is made out of natural resources for human use is called
Answer:
Man-made resources
Explanation:
Humanized resources are items or substances that have value to human lives that do not occur in the natural world. Examples of man-made resources include plastic, paper, soda, sheet metal, rubber and brass. These contrast with natural resources, such as water, crops, sunlight, crude oil, wood and gold.
please help me I will give you 10 points
Answer:
red ig
Explanation:
_____of gas molecules with an object is the cause of
pressure by a gas.
Answer:
Gas Pressure
Explanation:
Gas pressure is caused by the force exerted by gas molecules colliding with the surfaces of objects (Figure 5.2. 1). Although the force of each collision is very small, any surface of appreciable area experiences a large number of collisions in a short time, which can result in a high pressure.
Answer:
Collisions
Explanation:
It says that it was the answer.
A compound has a molar mass of 100 g/mol and the percent composition (by mass) of 65.45% C, 5.45% H, and 29.09% 0. Determine the empirical formula and the molecular formula.
A) CHO and C6H6O6
B) C3H3O and C6H6O2
C) C3HO and C6H2O2
D) CH2O and C4H8O4
E) CH4O and C3H12O3
Answer:
B) C3H3O and C6H6O2
Explanation:
Given data:
Molar mass of compound = 100 g/mol
Percentage of hydrogen = 5.45%
Percentage of carbon = 65.45%
Percentage of oxygen = 29.09%
Empirical formula = ?
Molecular formula = ?
Solution:
Number of gram atoms of H = 5.45 / 1.01 = 5.4
Number of gram atoms of O = 29.09/ 16 = 1.8
Number of gram atoms of C = 65.45 / 12 = 5.5
Atomic ratio:
C : H : O
5.5/1.8 : 5.4/1.8 : 1.8/1.8
3 : 3 : 1
C : H : O = 3 : 3 : 1
Empirical formula is C₃H₃O.
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass = 12×3 + 1.01 ×3 + 16×1 = 55.03
n = 100 / 5503
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2 (C₃H₃O)
Molecular formula = C₆H₆O₂
If the temperature of a gas in a balloon remains constant but the pressure
is decreased, the volume of the balloon will
decrease
increase
remain the same
not enough information to predict
Answer:
increase
Explanation:
if the pressure goes down then the gas will spread out more, meaning the volume will increase
The pH of a solution is 8.7
What is the pOH?
Answer:
pOH = -log[OH – ]
pH + pOH = 14
Explanation:
I did not understand the question but hope this help!
The pH of a solution is 8.7 and pOH is 5.3
What is sum of pH and pOH?The sum of pH and pOH is 14.
pH + pOH = 14
If pH of a solution is 8.7 then pOH is calculated as,
8.7 + pOH = 14
pOH = 14 - 8.7
pOH = 5.3
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A 170.0 g sample of an unidentified compound contains 29.84 g sodium, 67.49
g chromium, and 72.67 g oxygen. What is the compound's empirical formula?
The empirical formula : Na₂Cr₂O₇
Further explanationGiven
170 g sample contains :
29.84 g sodium, 67.49 g chromium, and 72.67 g oxygen
Required
The compound's empirical formula
Solution
mol ratio of elements :
Na : 29.84 : 23 g/mol = 1.297
Cr : 67.49 : 51,9961 g/mol = 1.297
O : 72.67 : 16 g/mol = 4.54
Divide by 1.297
Na : Cr : O = 1 : 1 : 3.5 = 2 : 2 : 7
Why did early people most likely choose to settle in Mesopotamia?
Answer:
People wanted to settle there because it had good living conditions. There was rich soil, and lots of water sources.
I hope this helps!
True/False: Atoms of the same elements have different properties
Answer: True
Explanation:
The Independent Variable is:
Kinetic Energy
Height
Mass
Speed
is mass conserved in 2Na+2H2O=2NaOH+H2
Answer:
yes mass conservation is in 2Na+2H2O=2NaOH+H2
Explanation:
it tells how many atoms or molecules of a reactant or a product take part in the reaction
What is the Sl unit for energy? Be sure to give the full name for the unit
Answer:
Joules
Explanation:
a train is climbing a gradual hill. the weight of the train creates a downhill force of 150,000 newtons. friction creates an additional force of 25,000 newtons acting in the same direction (downhill). how much force does the train's engine need to create so the train is going uphill at a constant speed?
Answer:
25000 is the answer
Explanation:
The answer is 25000 hope this helps you
25,000N is the total force, the train's engine need to create so the train is going uphill at a constant speed.
What is force?A force in physics is an effect that changes the velocity of a mass-moving object, causing it to accelerate from rest, for example. It is a vector quantity since it can be a push or perhaps a pull and always has magnitude and direction. It is denoted by the letter F and is measured in newtons (N), the SI unit of force (formerly P).
The net force exerted on an object approximately equal to the rate where its momentum varies over time, according to the original formulation of Newton's second law.
The force by the train weight Fw= 150,000N
The force creates by the friction Ff=25,000N
total force =Fw + Ff
= 150,000N+25,000N
= 25,000N
Therefore, 25,000N is the total force.
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What is the total magnification if we using objective lens 4x and our eyepiece (ocular) lens is 10x
40x
100x
400x
1000x
Find the volume of a locker that is 30cm long, 40cm wide, and 200 cm high.
Answer:
V= L × W × H so the answer is 240,000
How many atoms are in 4.5 g of AICI3?
Answer:
2.047 × 10^22 atoms.
Explanation:
To calculate the number of atoms (nA) in AlCl3, we first need to find the number of moles in the compound, AlCl3.
Molar mass of AlCl3 = 27 + 35.5(3)
= 27 + 106.5
= 133.5g/mol
Using mole = mass/molar mass
mole = 4.5/133.5
mole = 0.034moles
number of atoms in a substance (nA) = number of moles (n) × Avagadros number or constant (6.02 × 10^23 atoms)
nA of AlCl3 = 0.034 × 6.02 × 10^23
nA = 0.2047 × 10^23
nA = 2.047 × 10^22 atoms.
How did modern scientists experiment with Van Gogh's paints to determine their chemical reactions?
1. They used X-ray analysis.
2. They used litmus testing.
3. They burned the paint to examine what elements were left after the chromium was burned off.
4. They studied the density of modern yellow paint to that of 100-year-old paint.
Answer:
I think the answer is A - they used X-ray analysis.
Explanation:
Answer:They used X-ray analysis
Explanation:
It’s in the text
IF A CAPPED GLASS BOTTLE IS THROWN INTO A FIRE, WHAT WILL HAPPEN TO THE BOTTLE AND WHY?
Answer:
it will explode (not intensely) there is some oxygen in the bottle so the cap would pop off violently, the longer it stays in the fire the more energy is being pent up.
Explanation:
Answer:
The bottle will increase in both temperature and pressure which will cause the bottle to crack/shatter! Hope this helps :)
Explanation:
The law of Gay-Lussac states that as temperature increases so will pressure.
When two objects are touching, thermal
energy transfers from...
hotter to colder substances?
Or
colder to hotter substances?
Answer:
According to the laws of thermodynamics, Molecular movements of particles will tend to move into state of lower energy and this would mean that knowing the vibrational and translational energy of complex molecules will lose and give off energy usually in the form of heat but also sound and other transferable mediums it will tend to become less energetic and this mobile indicative of colder objects, if examining the average Molecular kinetic energy and bond energies of the compounds in question.
Does the following compound contain a polyatomic ion? CuCl2 *
Yes
No
Answer:
the answer is no
Explanation:
I don't no
Which of the following locations will most likely have the highest rate of evaporation?
A. South Pole
B.Sahara Desert
C Atlantic Ocean
D Amazon rainforest
When naming an ionic compound what must always
come first the anion or the cation? (Metal or
nonmetal)
Answer:
Cation / metal
Explanation:
When we named ionic compound we always write cation first. Let's take an example.
Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are bonded together electrostatic attraction occur between anion and cations and ionic compound is formed. When we naming it we write " sodium " first which indicate sodium cation ( Na⁺) while anion which is Cl⁻ is always written at the end. When we naming ionic compound we ended the name of anion with "ide". Sodium indicate metal while chloride ion indicate non metal. it means metal comes first while naming ionic compound.
Which place describes a community?
A. a desert of sand, rock, hawks, and snakes
B. the desert
C. a forest birds, insects, and squirrels
D. a hole in which a snake lives
2 eggs cook in a frying pan, which is sitting over a gas burner. Is thermal energy being transferred by radiation in this image? Why or why not?
Sample Response: No, thermal energy is not being transferred by radiation in this image. The eggs are in direct contact with the metal pan, which is in direct contact with the gas flame, so this is conduction, not radiation. Radiation transfers thermal energy by electromagnetic waves, not by direct contact.
Explanation:
No, thermal energy is not being transferred by radiation in this image.
The eggs are in direct contact with the metal pan, which is in direct contact with the gas flame.
Thermal energy is being transferred by conduction.
Radiation transfers thermal energy by electromagnetic waves.
Radiation does not transfer thermal energy by direct contact.
Thermal energy is the heat energy that is produced with an increase in temperature. No, thermal energy is not transferred by radiation when eggs are cooked.
What is radiation?Radiation is the process of thermal energy transfer that emits heat in all directions and does not require an intervening medium to travel.
Thermal energy is not transferred by radiation in the image as the eggs are in contact with the pan and the pan is in direct contact with a flame that radiates the heat by conduction.
Therefore, heat transfers by conduction and not by radiation.
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Tectonic Plates
Tectonic Plates
Which of the following is an accurate description of the movement of the tectonic plates in the diagram?
O A. Plate A is sliding past plate B.
O B. Plate A and plate B are diverging.
OC. Plate A and plate B are of equal density and are colliding.
OD. Plate A is denser than plate B, which results in subduction.
A sample of oxygen is collected in a 175 mL container over water at 15°C, and the barometer reads 752.0 torr.
What volume would the dry gas occupy at 770.0 torr and 15°C? (Water vapor pressure at 15°C is 12.8 torr.)
The volume of dry gas = 168 L
Further explanationGiven
175 ml container at 15°C
P total = 752 torr
water vapour = 12.8 torr
Required
The volume of dry gas
Solution
Dalton's law of partial pressure :
P tot = P₁ + P₂ + P₃ ....
P total = P O2 + P water
P O2 = 752 - 12.8
P O2 = 739.2 torr
Boyle's Law
At a fixed temperature, the gas volume is inversely proportional to the pressure applied
P₁V₁ = P₂V₂
739.2 175 = 770 .V₂
V₂ = 168 L
4. How many moles of H, would be
produced from 47 grams of H2SO4?
2A1 +3H,504 → Al2(SO4)3 +3H2
Answer:
0.48 moles of H₂ are produced.
Explanation:
Given data:
Number of moles of H₂ produced = ?
Mass of H₂SO₄ = 47 g
Solution:
Chemical equation:
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
Number of moles of H₂SO₄ :
Number of moles = mass/molar mass
Number of moles = 47 g/ 98 g/mol
Number of moles = 0.48 mol
Now we will compare the moles of H₂SO₄ and H₂
H₂SO₄ : H₂
3 : 3
0.48 : 0.48
Thus, 0.48 moles of H₂ are produced.
How many moles of CH3 are in 60 grams of CH3 ?
Answer: There are 3.99 .
Explanation:
The answers plzzzzzzz
Answer:
ok, whats the question
Explanation:
1) How many atoms are in Molecules? O One O Exactly two O Two or more O Compounds don't have atoms
Answer:
Two or more!
Explanation: