More reactants have more atoms to react to form more products.
Balance this equation. Pb(NO3)2(aq)+NaCl(aq) -> NaNO3(aq)+PbCl2(s)
Answer:
Pb(NO3)2(aq) + 2NaCl(aq) -> 2NaNO3(aq)+PbCl2(s)
Explanation:
Pb(NO3)2(aq)+NaCl(aq) -> NaNO3(aq)+PbCl2(s)
This is how it starts out.
Left:
2 NO3s1 Pb1 Na1 ClRight
1 Na1 NO31 Pb2 ClSo the place to start with this equation is to bring the Cls up to 2
Pb(NO3)2(aq)+2NaCl(aq) -> NaNO3(aq)+PbCl2(s)
But the Nas are now out of kilter.
Pb(NO3)2(aq)+ 2NaCl(aq) -> NaNO3(aq)+PbCl2(s)
Now the right has a problem. There's only 1 Na
Pb(NO3)2(aq) + 2 NaCl(aq) -> 2NaNO3(aq)+PbCl2(s)
Check it out. It looks like we are done.
Which statement about the organisms whose fossils are found in the rock is correct?
A.) Organism W existed much before Organism Y.
B.) Organism Y existed over the longest period of time.
C.) Organism Y and Organism U were alive over the same time span.
D.) Organism W existed over a shorter period of time than did Organism X. The table below shows the fossils of organisms found in various layers of an undisturbed rock:
Answer:
a?
Explanation:cause if organism w is a fossil and organism y is a rock the rock is way older than a fossil so a
Answer:
the answer is C
Explanation:
just did the test and Y, and U are in the same layer...so both were alive over the same time span.
HELP ME PLEASEEEEE!!!!!!!!!!
Answer:
I dont know what the answer is
Explanation:
The three types of intermolecular forces have different strengths. Rank
them from weakest to strongest.
Balance the equation:
C6H1206 + 02 → CO2 + H2O
Answer:
c6h12o6 + 6o2 = 6co2 + 6h20
Explanation:
c6h12o6 + 6o2 = 6co2 + 6h20
0 = 18 18
h = 12 12
c = 6 6
What results when equal but opposite charges are present in two regions of a polar molecule? A. dipole B. ionic bond C. Electron sea D. crystal lattice
Answer: A. dipole
Explanation:
Dipole can be defined as the separation of the equal and opposite charges present in the molecule via ionic bonding. The water molecule comprising of two molecules of hydrogen being positively charged and one molecule of oxygen being negatively charged are connected via ionic bonding thus water molecule is an example of dipole molecule. There is unequal distribution of the electrical density throughout the molecule.
The polar molecule results in a dipole when equal but opposite charges are present in two regions.
Dipole:
Dipole arises when a molecule have opposite and equal charge in the ends.
For example - water molecule
In water molecule Oxygen is negatively charged and hydrogen have low electronegativity, this difference in electronegativities arise dipole in molecule.
Therefore, the polar molecule results in a dipole when equal but opposite charges are present in two regions.
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Write a strong claim about the question:
What shape are cells?
( i don't really need a long answer)
Answer:
Usually, the cells are round, elongated or spherical. There are also some cells which are long and pointed on both the ends. Such cells exhibit spindle shape. In some cases, the cells are very long.
Explanation:
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Calculate the number of moles of NaOH contained in 250. mL of a 0.05M solution.
Answer:
0.0125mol
Explanation:
Molarity (M) = number of moles (n) ÷ volume (V)
n = Molarity × Volume
According to this question, a 0.05M solution contains 250 mL of NaOH. The volume in litres is as follows:
1000mL = 1L
250mL = 250/1000
= 0.250L
n = 0.05 × 0.250
n = 0.0125
The number of moles of NaOH is 0.0125mol.
White arctic hares blending in with the white snow in their environment is an example of what type of camouflage?
A. hiding
B. protective resemblance
C. mimicry
D. protective coloration
Answer:
The answer to your question is A.
D. Protective coloration. Protective coloration, also known as "crypsis," is a defense mechanism used by animals to avoid detection by predators or prey.
An illustration of protective coloration, which is a sort of camouflage, is how white arctic hares blend in with the white snow around them. Animals use protective coloration, commonly referred to as "crypsis," as a defensive strategy to evade being seen by predators or prey.
In this instance, the white arctic hares' fur is the same shade as that of their snowy environment. Their chances of survival are increased by this merging, which enables them to remain unnoticed and effectively hidden from predators like polar foxes or birds of prey. They have a better chance of escaping or avoiding detection when they are well-camouflaged, making it difficult for predators to see them against the white background.
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Match “the same” or “different” to each sentence.
Answer:
different , same, same, same
How many lone pairs does this molecule have?
Answer:
Just 1 i.e., Option B.
Because except for top of the molecule, all other sides are filled with a letter meaning there is one free space.
Answer:
B
Explanation:
H . + H . -----> H:H {":" represents a covalent bond, that is, a shared pair of electrons}
A Lewis structure is a convention used to represent the covalent bonding in a molecule. Dots or lines are used to represent
valence electrons (electrons available for bonding). The Lewis structure for the hydrogen molecule is as follows.
H:H or H-H
A bonding pair is an electron pair shared between two atoms.
A nonbonding pair (lone pair, unshared pair) is a pair of electrons that remains on one atom and is not shared.
Question 1
Which of the following is a false
Answer:
1.A 2.C 3.B
4. d
Explanation:
How many ATOMS are in 7.32 moles of sulfur
dioxide?
Using the concept of Avogadro's number, the number of atoms present is 4.4 * 10^24 atoms.
What is Avogadro's number?Professor Avogadro provided a nice way of calculating the number of atoms in a molecules by the use of the Avogardro's number. Now we know that 1 mole of a substance contains about 6.02 * 10^23 atoms, molecules ions etc.
Hence;
1 mole of sulfur dioxide contains 6.02 * 10^23 atoms
7.32 moles of sulfur dioxide contains 7.32 moles * 6.02 * 10^23 atoms/1 mole
= 4.4 * 10^24 atoms.
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PLease HELP How many molecules of CO2 are there in 55 grams of CO2?
Answer:
1.2mol
Explanation:
Determine the g/mol of CO2
O - 16g/mol (based on my data booklet)
C - 12.01g/mol (based on my data booklet)
Then add these values up for the g/mol of CO2
16+16+12.01= 44.01g/mol
Then write out the formula
mol = mass/molar mass
n= m/M
n = 55/44.01
n= 1.24971597
and depending on what significant digits you need (based on info, ill do it to 2 terms)
n = 1.2 mol
Molar mass is defined as the mass in grams of one mole of a substance. 1.2 molecules of CO2 are there in 55 grams of CO2.
What do you mean by molar mass ?The term molar mass is defined as the mass of a chemical compound divided by its amount-of-substance measured in moles. It is represented by the symbol "M". The units of molar mass are grams per mole, abbreviated as g/mol.
The weight of one mole of a sample is defined as its molar mass. To calculate a molecule's molecular mass, multiply the subscript by the atomic mass of each element in the molecule, then add the masses of all the elements in the molecule.
Molar mass of Oxygen - 16g/mol
Molar mass of Carbon - 12.01g/mol
Then add these values up for the g/mol of CO₂
Molar mass of CO₂ = 16+16+12.01
= 44.01g/mol
Then,
The number of mole = mass / molar mass
n = m / M
n = 55 / 44.01
n = 1.24971597
n = 1.2 mole
Thus, 1.2 molecules of CO2 are there in 55 grams of CO2.
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Measurements show that unknown compound X has the following composition:
element mass %
carbon 74.8%
hydrogen 25.1%
Write the empirical chemical formula of X. please help
the empirical chemical formula of X is CH4
Explanation:Step 1: Imagine you have a sample of compound weighing exactly . Multiply the mass of this sample by the mass percents to find the mass of each element in the sample
Step 2: Divide the mass of each element by the element's molar mass to find the moles of each element in the sample. Remember to round your answers to the correct number of significant digits.
Step 3: Divide the moles of each element by the the smallest number of moles of any element to find the mole ratio of elements in the sample.
Step 4: Multiply the mole ratio by the smallest whole number that changes it into a whole number ratio to find the atom ratio of elements in the sample.
Note that the result of each multiplication must equal a whole number only within measurement uncertainty.
The measurement uncertainty in this calculation comes from the measurement uncertainty of the mass percents given in the question. The mass percents each have significant digits. That means each mass percent has some measurement uncertainty in the third significant digit, and only the first two significant digits can be considered completely reliable.
In Step 1 you multiplied each mass percent by something with zero uncertainty (the exactly you assumed your sample weighed), in Step 2 you divided by a measurement with more than significant digits (the molar mass of the elements), and in Step 3 you divided by a measurement with the same number of significant digits (the least number of moles of any element in the compound). None of these steps added to the measurement uncertainty of your calculation.
Therefore, the measurement uncertainty in the final result of all your calculations is determined by the measurement uncertainty in the original mass percents and will be in the third significant digit. That means the result of each of the final multiplication steps must equal a whole number only to within the first two significant digits.
The whole numbers in the last column of the table are and .
How many molecules are in 41.8 g H2O?
Answer:
7.63 × 10²³ molecules
Explanation:
First, convert grams to moles using the molar mass of water (32.988 g/mol).
41.8 g ÷ 32.988 g/mol = 1.267 mol
Next, convert moles to molecules using Avogadro's number (6.022 × 10²³).
1.267 mol × 6.022 × 10²³ molecules/mol = 7.63 × 10²³ molecules
9. Good insulator should be
(a) Fire proof
(b) Chemically inert
(c) Odourless in use
(d) All of the above
Ar
Answer:
A fire proof
Explanation:
I hope this is help
Which conversion factor below would you use to complete this conversion?
How many liters of bromine gas would 12.3 moles occupy at Standard Temperature and Pressure?
a.) 1 mole/22.4 L
b.) 22.4 mol/1 liter
c.) 22.4 L/1 mole
d.) 1 liter/22.4 mol
Answer:
c.) 22.4 L/1 mole
Explanation:
Using the general gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
The standard values for a gas are as follows:
Standard pressure of a gas = 1 atm
Standard temperature of a gas = 273K
According to the information in the question, n = 12.3 moles
Using PV = nRT
V = nRT/P
V = 12.3 × 0.0821 × 273/1
V = 275.68 L
Based on this value of volume in liters for 12.3moles of Br gas, the volume per mole at standard temperature and pressure will be 275.68/12.3 = 22.4 Litres per mole. Hence, the answer is 22.4 L/1 mole.
Under each photo,
write an example of where you
might find water in that state of
matter.
Answer:
Explanation:
water vapor:in a cloud or when you breath out once it's cold.Ice: in your freezer or on a frozen lake.liquid water:at a stream
Someone please help me with this I dont know if this is correct
Answer:
Yes its correct
Explanation:
Protons + Nuetrons
Answer: Go with your gut cos
Explanation:
Write the equilibrium expressions for each of the following equilibria:
a. 2 Ba + O2 ⇌ 2 BaO
b. 2 Mg + O2 ⇌ 2MgO
c. P4 + 5 O2 ⇌ P4O10
Answer:
a.
[tex]K=\frac{[BaO]^2}{[Ba]^2[O_2]}[/tex]
b.
[tex]K=\frac{[MgO]^2}{[Mg]^2[O_2]}[/tex]
c.
[tex]K=\frac{[P_4O_{10}]^2}{[P_4][O_2]^5}[/tex]
Explanation:
Hello!
In this case, since the equilibrium expression is set up by dividing the products over the reactants and powering to the stoichiometric coefficient, we can proceed as follows:
a. 2 Ba + O2 ⇌ 2 BaO.
[tex]K=\frac{[BaO]^2}{[Ba]^2[O_2]}[/tex]
b. 2 Mg + O2 ⇌ 2MgO
[tex]K=\frac{[MgO]^2}{[Mg]^2[O_2]}[/tex]
c. P4 + 5 O2 ⇌ P4O10
[tex]K=\frac{[P_4O_{10}]^2}{[P_4][O_2]^5}[/tex]
Best regards.
The chemical equation, Cr + Fe(NO3)2 → Fe + Cr(NO3)3, is an example of which type of reaction?
Answer:
Redox type
Explanation:
The reaction is:
2Cr + 3Fe(NO₃)₂ → 2Fe + 2Cr(NO₃)₃
2 moles of chromium can react to 3 moles of iron (II) nitrate in order to produce 2 moles of iron and 2 moles of chromium nitrate.
If we see oxidation state, we see that chromium changes from 0 to +3
Iron changed the oxidation state from +2 to 0
Remember that elements at ground state has 0, as oxidation state.
Iron is being reduced while chromium is oxidized. Then, the half reactions are:
Fe²⁺ + 2e⁻ ⇄ Fe (Reduction)
Cr ⇄ Cr³⁺ + 3e⁻ (Oxidation)
When an element is being reduced, while another is being oxidized, we are in prescence of a redox reaction.
PLZ HELP WILL BRAINLIEST balance the following equation: N2 + H2 --> NH3
Write the coefficients that you decide to balance the equation like this 3, 4, 3. If you do not add a coefficient in front of an element or compound, use a 1 in your answer. For instance the for this balanced equation: 2H2 + O2 --> 2H2O you would write your answer: 2, 1, 2
Answer:
1,3,2
Explanation:
N2 + 3H2-----> 2NH3
What is the correct formula for sodium carbonate?
a. Na(CO3)2
b. Na,(CO3)2
C. Na2CO3
Naz(CO)2
e. NaCO3
d.
a
a
b
b
ΟΟΟΟΟ
С
С
d
d
е
e
Answer:
na2 co3
Explanation:
sodium carbonate formula
Answer:
your answer is C.
Explanation:
this is what it would be like
O
|
|
Na+ C Na+
/ \
/ \
O- O-
How do you find the scientific notation of a Avogadro's number??
Answer: ummmmmm hmmmmm
Explanation:
What volume will 3.50 mol of ammonia gas occupy at conditions of standard temperature and pressure?
Answer:
Q:
What volume will 3.50 mol of Xe gas occupy at STP?
A:
78.4 L
Explanation:
The volume occupied by 3.5 moles of ammonia gas at standard temperature and pressure (STP) is 78.45 L
Data obtained from the question Number of mole (n) = 3.5 moles Pressure (P) = STP = 1 atm Temperature (T) = STP = 273 KGas constant (R) = 0.0821 atm.L/Kmol Volume (V) =? How to determine the volume
The volume of the gas at standard temperature and pressure (STP) can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
1 × V = 3.5 × 0.0821 × 273
V = 78.45 L
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What is the meaning of the word neutral?
Explanation:
having no strongly marked or positive characteristics or features.
If today is Monday and it is a 1st Quarter moon, what phase will it
be on Thursday?
Answer:
Wanning gibouss 56%
Explanation:
.
7)
A 1-gram sample of which substance in a sealed 1-liter container will occupy the container
completely and uniformly?
A)
H2O(g)
B)
H2000)
C
Hg(0)
D)
Ag(s)
Answer:A) H20 gas
Explanation:
Based on the property of gases, 1-gram sample of hydrogen gas, H₂ in a sealed 1-liter container will occupy the container completely and uniformly.
What is the nature of a gas?Gases are one of the states of matter.
Gas molecules have negligible forces of attraction between them, therefore, they are always in motion.
Gases do not have a specific shape or volume, rather they fill up every available space in their container.
Of the given option, only H₂ is a gas.
Therefore, 1-gram sample of hydrogen gas, H₂ in a sealed 1-liter container will occupy the container completely and uniformly.
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80 ml of carbon monoxide (CO) are reacted with 40 ml of oxygen (O2). What volume of carbon dioxide (CO2) is formed? 2CO + O2 → 2CO2
a. 200 ml
b. 120 ml
c. 80 ml
d. 40 ml
The volume of carbon dioxide is formed is Option C i.e. 80 ml.
Given that,
80 ml of carbon monoxide (CO) are reacted with 40 ml of oxygen ([tex]O_2[/tex]).Based on the above information, the calculation is as follows:
Here the volume should be 80ml
Therefore we can conclude that The volume of carbon dioxide is formed is Option C i.e. 80 ml.
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