A mixture of uneven distribution and easy separation is called. homogeneous a solution heterogeneous a standard

Answers

Answer 1

Answer:

The solutes dissolves in solvent results in the formation of a solution.

Those mixtures in which the components of mixture are uniformly distributed throughout the mixture are said to be homogeneous.

Those mixtures in which the components of mixture are not uniformly distributed throughout the mixture are said to be heterogeneous.

Those solutions whose concentrations are accurately known are known as standard.

Hence, a mixture of uneven distribution and easy separation is heterogeneous.

Answer 2

Answer:

Answer:

A heterogenous separation!

Explanation:

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The liquids hexane and water are placed in a test tube. The test tube is stoppered, shaken, and placed in a test tube rack. The liquids separateinto two distinct layers because hexane and water have different
(1) formula masses
(2) molecular polarities
(3) pH values
(4) specific heats

Answers

Answer: option 2. molecular polarities

Explanation:

The liquids hexane and water are placed in a test tube. The test tube is stoppered, shaken, and placed in a test tube rack. The liquids separate into two distinct layers because hexane and water have different molecular polarities. The answer is number 2.

An important application of exponential functions is working with half-life of radioactive isotopes in chemistry. These isotopes emit particles and decay into stable forms, in doing so they lose mass over time. Half-life of an isotope is the time it takes for the amount to decay by half. For example, the half life of Bromine-85 is 3 minutes. This means if you start with 60g of Br-85, 3 minutes later 30g will remain. How much Br-85 will remain after 20 minutes?

Answers

Answer : The amount left after 20 minutes is, 0.592 grams.

Explanation :

Half-life of Bromine-85 = 3 min

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

$k=\frac{0.693}{3\text{ min}}$

$k=0.231\text{ min}^(-1)$

Now we have to calculate the amount left after decay.

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

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

where,

k = rate constant

t = time taken by sample = 20 min

a = initial amount of the reactant = 60 g

a - x = amount left after decay process = ?

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

$20=(2.303)/(0.231)\log(60)/(a-x)$

$a-x=0.592g$

Therefore, the amount left after 20 minutes is, 0.592 grams.

Round off the following measurement to three significant digits: 3255 mL. (a) 325 mL (b) 326 mL (c) 3250 mL (D) 3260 mL (e) none of the above

Answers

The answer is B. If you round it correctly you would get 326 ml and this number happens to have three significant digits.

Final answer:

To round off the measurement 3255 mL to three significant digits, the correct answer is (c) 3250 mL.

Explanation:

To round off a measurement to three significant digits, we look at the digit to the right of the third significant digit. If this digit is 5 or greater, we round up. If it is less than 5, we round down. In the given measurement of 3255 mL, the digit to the right of the third significant digit is 5, so we round up. Therefore, the correct answer is (c) 3250 mL.

Learn more about Rounding off measurements here:

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Which of the following would NOT be a physical property of matter?malleability

boiling point

color

reactivity

________________________________________________________

If a substance cannot be separated physically or chemically, it is __________.

a compound

an element

a solution

a mixture

___________________________________________________________________

If a substance cannot be separated physically, it is __________.

Question 6 options:

a pure substance

heterogeneous

a mixture

an alloy

___________________________________________________________________

How would you classify tap water?

Question 8 options:

a pure substance

a homogeneous mixture

a compound

a heterogeneous mixture

___________________________________________________________________

When sugar and water are mixed they make a solution. Another way to say a solution would be to call it a __________________.

pure substance

homogeneous mixture

compound

heterogeneous mixture

Answers

reactivity

solution

mixture

homogeneous mixture

i think the fourth one might be wrong sorry );

Which of the following would NOT be a physical property of matter?

reactivity

________________________________________________________

If a substance cannot be separated physically or chemically, it is __________.

an element

___________________________________________________________________

If a substance cannot be separated physically, it is __________.

an alloy

___________________________________________________________________

How would you classify tap water?

a compound

___________________________________________________________________

When sugar and water are mixed they make a solution. Another way to say a solution would be to call it a __________________.

compound

Hydrocarbons having the same formula but variations in structure are called isomers.a. True
b. False

Answers

Answer:The given statement is true.

Explanation:

Isomers are defined as two or more compounds with same structural formula but different arrangement of atom and chemical properties.

For example: Butane, 2-methyl propane are isomers with structural formula $C_4H_(10)$ , acetone and propanal both isomers to each other with same structural formula of $C_3H_6O$ .

A client is to receive 150 mL of intravenous solution over the next hour using a microdrip delivery system. How much fluid would the client receive in 1 minute?

Answers

Answer:

150ml .........60 minute

x ........... 1 minute

x = 150ml× 1 minute / 60 minute

x = 2.5ml

Explanation:

it is known that the client receives 150ml of the solution for over an hour.convert the hour into minutes,then we do not know how much liquid a client receives in a minute. we cross multiple the values to get the value in ml. for every one minute the client receives 2.5ml of the fluid.

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