Predict the precipitate produced by mixing an Al(NO3)3 solution with a NaOH solution. Write the net ionic equation for the reaction. (Include the states of matter.)

Answers

Answer 1

Answer: Al(NO3)3(aq) + 3NaOH(s) --> Al(OH)3 (s) + 3NaNO3 (aq)

The precipitate here is Al(OH)3 (s), since the solid reactant is the precipitate in the aqueous solution. Usually, it is okay to assume in basic chemistry that the transition metal is going to be part of the compound that is the precipitate, especially in an acidic salt and a strong base reaction that we have here.

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Which best describes nuclear fission

Answers

Nuclear fission is either a nuclear reaction or radio active decay process in which nucleus (the center) of an atom splits into smaller parts called nuclei. This is an extremely exothermic reaction (i.e a reaction which produces heat) resulting into release of massive amount of energy in the form of heat and sometimes light. The reaction produces much more energy as compared to a similar mass of a conventional fuel, such as Petrol/Kerosene/Petroleum Gas etc. This makes Nuclear fission an extremely dense and at times very destructive source of energy. Some common elements capable of Nuclear fission are Uranium, Plutonium etc. Though in modern days Nuclear Fission are finding application in being a source of energy (such as a Nuclear power plant), but they are also used in destructive format as Nuclear Bombs and it's one of the top most imminent threats to the existence of humanity in future (in the event of a Nuclear war).

couldnt you just put the answers itd be a lot easier to answer for you like that

Samarium-146 has a half-life of 103.5 million years. After 1.035 billion years, how much samarium-146 will remain from a 205-g sample?0.200 g
0.400 g
20.5 g
103 g

Answers

Answer : The correct option is, 0.200 g

Solution :

As we know that the radioactive decays follow first order kinetics.

First we have to calculate the rate constant of a samarium-146.

Formula used :

$t_(1/2)=(0.693)/(k)$

Putting value of $t_(1/2)$ in this formula, we get the rate constant.

$103.5* 10^6=(0.693)/(k)$

$k=6.6* 10^(-9)year^(-1)$

Now we have to calculate the original amount of samarium-146.

The expression for rate law for first order kinetics is given by :

$k=(2.303)/(t)\log(a)/(a-x)$

where,

k = rate constant = $6.6* 10^(-9)year^(-1)$

t = time taken for decay process = $1.035* 10^(9)years$

a = initial amount of the samarium-146 = 205 g

a - x = amount left after decay process = ?

Putting values in above equation, we get the value of initial amount of samarium-146.

$6.6* 10^(-9)=(2.303)/(1.035* 10^(9))\log(205)/(a-x)$

$a-x=0.200g$

Therefore, the amount left of the samarium-146 is, 0.200 g

Ans: 0.200 g

Given:

Half life of Sm-146 = t1/2 = 103.5 million years

Time period, t = 1.035 billion years = 1035 million years

Original mass of sample, [A]₀ = 205 g

To determine:

Amount of sample after t = 1035 million years

Explanation:

The rate of radio active decay is given as:

$A(t) = A(0)e^(-0.693t/t1/2) \n\n= 205 g * e^{(0.693*1035)/(103.5) } \n\n= 0.200 g$

Formula A: CH3Formula B: C2H6
Given the two formulas representing the same compound:
Which statement describes these formulas?
(1) Formulas A and B are both empirical.
(2) Formulas A nd B are both molecular.
(3) Formula A is empirical and Formula B is molecular.
(4) Formula A is molecular and Formula B is empirical.

Answers

Correct option is (3).

Empirical formula:-Simplest whole number ratio of various atoms present in a compound.

Molecular formula:-The formula that gives the total number of atoms of each element in each molecule of a substance.

So, $C_2H_6$ (formula B) is the molecular formula, and $CH_3$ (Formula A)is the empirical formula.

Hence, the correct option is (3).

To know more about:-

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(3) because Hydrocarbon compound has 3 forms:
CnH2n
CnH2n-2
And CnN2n+2

How many grams of lithium nitrate will be needed to make 250.0 grams of lithium sulfate?

Answers

the answer would be 313 g

Which of the following molecules has polar bonds but is a nonpolar molecule?a. H₂
b. H₂O
c. NH₃
d. NaCl
e. CO₂

Can anyone explain this one?

Answers

H2: non polar bond. non polar molecule
H2O: polar bonds, but there is a angle between 2 H-O bonds. so it's a polar molecule
NH3: polar bonds, but it's a stereochemical structure, like a pyramid with triangle base, N is the vertex. polar molecule.
NaCl: polar bond, polar molecule.(ion bond)
CO2: 2 O atoms are at two sides of C atom horizonally. giving CO2 a symmerical structure. it's nonpolar molecule with 2 polar bonds.

Final answer:

Carbon dioxide (CO₂) is a molecule with polar bonds but is considered nonpolar due to its linear shape.

Explanation:

In order to determine whether a molecule is polar or nonpolar, we must consider both the polarity of the individual bonds and the molecular geometry. A molecule with polar bonds can be nonpolar if the bond polarities cancel each other out due to the overall molecular shape.

Out of the given options, the molecule that has polar bonds but is nonpolar is CO₂. Carbon dioxide has two polar bonds between carbon and oxygen, but the molecule has a linear shape, which results in the bond polarities canceling each other out, making the molecule nonpolar.

Learn more about Polarity of Molecules here:

brainly.com/question/15173422

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What is the mass of NH4Cl that must dissolve in 200. grams of water at 50.°C to make a saturated solution?(1) 26 g (3) 84 g
(2) 42 g (4) 104 g

Answers

Answer: It's 104 g

Explanation: yes

at 50ºC:

50 g NH₄Cl----------------- 100 g (H₂O)
? mass NH₄Cl------------- 200 g (H₂O)

mass NH₄Cl = 200 . 50 / 100

mass

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