Answer:
3 significant digits
Explanation:
The first 0 don't count (that's the rule in significant digits). So 3,0,0 are left over. Count them and total will be 3 significant digits. (remember the last zero count if there is a decimal but the first zeros doesn't count even with the decimals)
Calculate the volume of oxygen at NTP obtained by decomposing 12.26g of KCLO3(at wt. K=39.1, Cl=35.5 and O = 16)
Answer: 3.61 L
Explanation:
To calculate the moles, we use the equation:
[tex]moles=\frac{\text {given mass}}{\text {Molar mass}}[/tex]
[tex]moles=\frac{12.26g}{122.6g/mol}=0.1moles[/tex]
[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
2 moles of [tex]KClO_3[/tex] produce = 3 moles of [tex]O_2[/tex]
0.1 moles of [tex]KClO_3[/tex] produce = [tex]\frac{3}{2}\times 0.1=0.15[/tex] moles of [tex]O_2[/tex]
According to the ideal gas equation:'
[tex]PV=nRT[/tex]
P = Pressure of the gas = 1 atm (NTP)
V= Volume of the gas = ?
T= Temperature of the gas = 20°C = (20+273) K = 293 K (NTP)
R= Value of gas constant in in kilopascals = 0.0821 Latm/K mol
[tex]1\times V=0.15\times 0.0821\times 293[/tex]
[tex]V=3.61L[/tex]
Thus volume of oxygen at NTP obtained by decomposing 12.26 g of [tex]KClO_3[/tex] is 3.61 L
a bus travels 20km in 30minutes what is the average speed of the bus?
Answer:
40km/hr
Explanation:
Speed = Distance ÷ Time and since they both have different units we have to change one of them. Therefore if we change 30 minutes to half an hour we say 20km ÷ ¹/2
humans have a total of 46 chromosomes therefore, humans inherit ____ chromosomes from each parent. (use numerals for the answer)
Answer:
23
Explanation:
there are 23 pairs of chromosomes
46 individula chromosomes
but each parnet contribute one chromosome to each pair
Answer:
23 :)
Explanation:
Some atoms are chemically stable and will not bond with atoms of other
elements. Describe atoms that are stable.
help
Answer:
The stability of atoms depends on whether or not their outer-most shell is filled with electrons. If the outer shell is filled, the atom is stable. Atoms with unfilled outer shells are unstable, and will usually form chemical bonds with other atoms to achieve stability.
Explanation:
Answer:
The stability of atoms depends on whether or not their outer-most shell is filled with electrons. If the outer shell is filled, the atom is stable. Atoms with unfilled outer shells are unstable, and will usually form chemical bonds with other atoms to achieve stability.
Explanation:
what is the soda's density if its volume is 384ML, and its mass is 402g?
Answer:
1.05 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{402}{384} \\ = 1.046875[/tex]
We have the final answer as
1.05 g/mLHope this helps you
There are two spheres of the same
size, one is metal and one is wood. Why
does the metal sphere have more mass?
Answer:
metal is heavier than wood.
Explanation:
metal is made of rock which doesn't have air in it while wood has air in it making it lighter
what is the empirical formula?
Answer:
CH (92.2% C; 7.8% H), or just CH2
A student uses a force of 46 Newtons to push her bike 57 meters. How much work has she done?
W = F x D
Answer:
The displacement is 0.05 meters. The angle between the upward force and the upward displacement is 0 degrees. The work for 1 push-up is approximately. W = 10 N * 0.05 m * cos 0 degrees = 0.5 Joules. If the squirrel does a total of 5.0 Joules of work, then it must have done about 10 push-ups.
Explanation:
2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2O
In the above equation how many moles of N2 can be made when 13 moles of CuO are consumed?
Answer:
From 13 moles of CuO 4.3 moles of N₂ are formed
Explanation:
Given data:
Number of moles of N₂ formed = ?
Number of moles of CuO react = 13 mol
Solution:
Chemical equation:
2NH₃ + 3CuO → 3Cu + N₂ + 3H₂O
Now we will compare the moles of CuO and N₂.
CuO : N₂
3 : 1
13 : 1/3×13 = 4.3 mol
Thus, from 13 moles of CuO 4.3 moles of N₂ are formed.
From 13 moles of CuO 4.3 moles of N₂ are formed.
Given:
Number of moles of CuO react = 13 mol
To find:
Number of moles of N₂ formed = ?
The balanced chemical equation:
2NH₃ + 3CuO → 3Cu + N₂ + 3H₂O
On comparing the moles of CuO and N₂.
CuO : N₂
3 : 1
13 : 1/3*13 = 4.3 mol
Thus, from 13 moles of CuO 4.3 moles of N₂ are formed.
Learn more:
brainly.com/question/13314627
___ organisms only need one cycle of cell division to create offspring
Answer:
asexual organisms because they
self reproduce by fissure division instead of meiosis
what physical properties can be used to separate heterogeneous mixture's?
What is an oxidation number?
a
The charge acquired by an atom in a chemical bond
b
The number of electrons involved in a chemical bond
c
The number of oxygen atoms an element will bond with
d
The number of oxygen atoms a compound has
Answer:
d
Explanation:
i hope it helps you good luck
please help me, please
Answer:
D.H2CO3
Explanation:
answer is d h2co3
Mark as brainliest my G
Which stage in the life cycle of a plant is represented in this
Adult plant
Seed
Seedling
Sprout
Answer:
hey there!
I hope this is correct it is a adult plant
hope it is correct and have a great day!3. What range of numbers would you expect on the pH scale for an alkali? (1 mark)
Answer:
a pH above 7 is alkali
a pH lower than 7 is acidic
How many liters are in 3.00 moles of Ar
What causes surface water to move
Answer:
C - Wind
Explanation:
its C or wind because global wind systems control the surface water
Answer:
Wind
Explanation:
surface water from oceans move from the wind I assume it is the same for all bodies of water
What type of bond holds hydrogen (H) atoms together in a molecule of hydrogen?
A. Metallic
B. Polar Covalent
C. Nonpolar covalent
D. Hydrogen
Answer:
C. Nonpolar covalent
Explanation:
The type of bond that holds hydrogen(H) atoms together in a molecule of hydrogen is a non-polar covalent bond.
A covalent bond forms between two atoms with low or zero electronegativity difference. It is usually between non - metals or atoms of the same kind. When atoms of the same kind bonds as in hydrogen to form hydrogen gas, non-polar covalent bond is formed. This is because there is no charge separation.Which intermolecular force would affect the boiling point the least?
Answer: Van der Waals forces
Explanation: trust me i tried the other dudes answer and I got it wrong.
The intermolecular force that would affect the boiling point the least is ionic bonding. The correct option is C.
Strong electrostatic interaction between ions that are positively and negatively charged is referred to as ionic bonding.
It takes place when two atoms with vastly differing electronegativities are in close proximity to one another, leading to the transfer of electrons from one atom to another to create ions.
Although ionic compounds have high melting and boiling temperatures, intermolecular forces are less important than the strong attraction between the ions in the solid state.
In contrast, neutral molecules or atoms experience intermolecular forces such as hydrogen bonds, dipole-dipole interactions, and Van der Waals forces (which include dispersion forces).
The boiling points of substances are greatly influenced by these factors.
Thus, the correct option is C.
For more details regarding intermolecular forces, visit:
https://brainly.com/question/9328418
#SPJ6
Help please I need it
EZ POINTS!!!
!!!
..!!!!!
How many moles and atoms are there in 60 grams of Calcium? quick answer plz i m preparing for exams
Answer:
the number of mol that 60 gram of calcium will have this 1.5 mol.
as number of mole is equal to
n=w/m which is
60/40 which is 1.5 mol
and that of the number of atoms it will have will be 60 over 40 times the algorithm constant 6.223 times 10 to the power 23 which will give 9.0 345 ×10²³
I WILL GIVE U BRAINLIEST IF UR CORRECT
Which of the following is always a result of a chemical reaction?
Hint: The questions says always.. only one best answer
A. Bubbles
B. Fire or smoke
C. Temperature change
D. A new substance
Answer:
D: a new substance
Explanation:
Chemical reaction
A change in matter that produces on or more new substances
Answer:
D. A new substance is always a result of a chemical reaction.
Explanation:
In a chemical reaction, one or more reactants reacts/decomposes to form one or more products.
What is the formula for an ionic compound that forms out of Sr and Br?
Group of answer choices
Sr and Br will not form an ionic compound.
Sr2Br
SrBr2
SrBr
Answer: St Br2
Explanation: Br has only one valence electrons and Sr has 2 valence electrons this is why we need 2 atoms of Br to for an ionic compound with 1 atom of Sr.
3. Give difference: Mass and Weight
Answer and Explanation:
Your mass is the same no matter where you go in the universe; your weight, on the other hand, changes from place to place. Mass is measured in kilograms; even though we usually talk about weight in kilograms, strictly speaking, it should be measured in newtons, the units of force. (according to cosmicmagazine.com)(not my writing or explanation)
Please help fast
What statement is correct about wind turbines. A. They create Mechanical and electrical energy B. They transform wind energy to electrical energy C. Their total energy decreases when electricity is produced D. Their total energy increases when electricity is produced
Answer:
A.
Explanation:
sana makatulong follow mo ako please
According to the carbon cycle, what two processes increase CO2 in the atmosphere?
Answer: Carbon dioxide is added to the atmosphere naturally when organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes erupt. Carbon dioxide is also added to the atmosphere through human activities, such as the burning of fossil fuels and forests and the production of cement.
Explanation: Hope this helps :)
Step 2: measure the area of the top of the syringe
I am unsure if this is correct, but this might be the whole section:
The top of the syringe is a circle. You need to compute its area for use in later computations of pressure values. Start by using a ruler to measure the diameter. Estimate to the nearest 0.01 cm. Answer: 3.60 cmDivide by two to find the radius. Maintain significant figures. Answer: 1.80 cmSubstitute the radius into the formula A = πr² to find the area of the top of the syringe. Maintain significant figures. Answer: 10.2 cm²In which reaction is there a transformation of mass into energy? For A P E X
A. Two hydrogen atom fuse to form a helium atom
B. Ammonium nitrate breaks down into dinitrogen monoxide and water
C. Calcium oxide combines with water to form calcium hydroxide
D. Sodium combines with chlorine to form sodium chloride
Based on the contributions of early scientists, one can conclude that one discovery was
Answer:
the discovery of atomic structure.
Explanation:
Rutherford was a famous scientist who gave his theory of atomic structure.
Ernest Rutherford was a great physicist who is well known for his pioneering studies and discoveries about atoms and radioactivity. Rutherford was considered to be the greatest experimentalist after Michael Faraday.
Rutherford's atomic model was one of the greatest discoveries which provided many answers and solutions to the structure of atom and molecules that our earth is surrounded of.
Rutheford discovered that an atom has a tiny mass of positively charged particles in the centre of the atom called nucleus and negatively charged electrons surrounds the nucleus.
Bohr joined Rutherford in his studies and discovered many new facts about the structure of the atom based on the Rutherford's model. Today atomic model is the product of Rutherford atomic structure.
