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REY [17]
3 years ago
14

youare given the solution of l!ad nitrate in order to obtaina yellow precipite you should mix with it if a solution a)sulphric a

cid b)citric acid c)carbonic acid d) hydrochloric acid​
Chemistry
1 answer:
Fiesta28 [93]3 years ago
7 0

Answer:

B. citric acid it just makes sense

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All mixtures can be separated by physical processes. true or false
DaniilM [7]
<span>True. In chemistry, mixtures are two (or more) substances mixed together but not combined chemically. This means there are no chemical bonds that have formed between the substances. As such, they can be separated with physical processes.</span>
7 0
3 years ago
Carbon-14 has a half-life of 5720 years and this is a first order reaction. If a piece of wood has converted 75% of the carbon-1
liraira [26]

Answer: 1145.8 years

Explanation:

Half-life of carbon-14 = 5720 years

First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{5720\text{years}}

k=1.21\times 10^{-4}\text{years}^{-1}

Now we have to calculate the age of the sample:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = 1.21\times 10^{-4}\text{years}^{-1}

t = age of sample  = ?

a = let initial amount of the reactant  = 100 g

x = amount decayed = 75 g

a - x = amount left after decay process  = 100 - 75 = 25g

Now put all the given values in above equation, we get

t==\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{25}

t=1145.8years

8 0
3 years ago
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Which of the following would result in decreased entropy?
maria [59]
B ice melting hope it helps

4 0
3 years ago
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The nature of zinc powder and Cobalt (II )oxide is heated the following reaction occurs ;
Scilla [17]

1) The metal which reduces the other compound is the one higher in the reactivity. So in this case it is \mathrm{Zn}.

2) The substance which brings about reduction while itself getting oxidised (that is losing electrons) is called a reducing agent. Here, $\mathrm{Zn}$ is the reducing agent and reduces Cobalt Oxide to Cobalt while itself getting oxidised to Zinc oxide.

8 0
3 years ago
A helium balloon has a volume of 17.3 L
NemiM [27]

Answer:

15.28 L

Explanation:

Use combined gas law and rearrange formula

Change C to K

- Hope that helped! Please let me know if you need further explanation, as I can show you step by step.

5 0
3 years ago
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