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3 years ago

When two clear, colourless liquids are mixed together, a yellow precipitate is formed. This is an example of a

Chemistry

1 answer:

Flura [38]3 years ago

3 0

Answer:

Combining the two clear colorless liquids is a chemical change.

Explanation:

Because a different solid substance is formed. Tell students that a precipitate is an insoluble solid that forms when two solutions are combined and react chemically. Insoluble means that the solid will not dissolve.

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In 1786 Luigi Galvani developed the theory of: a Static electricity b Reciprocal electricity c Animal electricity d battery elec

Ostrovityanka [42]

Static electricity jrbfbfjfbfbbfbfjfngbffjfbfbffjnfnfnf

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3 years ago

On the periodic table, which group contains the noble gases? the last group A.the second group B.the fourth group C.the fir

Leni [432]

There you go your welcome

4 0

4 years ago

If the half-life of 37Rb is 4.7x101 years, how long would it take for 0.5 grams of a 2 gram sample to radioactively decay?

k0ka [10]

<u>Answer:</u> The time required will be 19.18 years

<u>Explanation:</u>

All the radioactive reactions follows first order kinetics.

The equation used to calculate half life for first order kinetics:

$k=\frac{0.693}{t_{1/2}}$

We are given:

$t_{1/2}=4.7\times 10^1yrs$

Putting values in above equation, we get:

$k=\frac{0.693}{4.7\times 10^1yr}=0.015yr^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $0.015yr^{-1}$

t = time taken for decay process = ?

$[A_o]$ = initial amount of the reactant = 2 g

[A] = amount left after decay process = (2 - 0.5) = 1.5 g

Putting values in above equation, we get:

$0.015yr^{-1}=\frac{2.303}{t}\log\frac{2}{1.5}\\\\t=19.18yrs$

Hence, the time required will be 19.18 years

4 0

3 years ago

Help please !!!

nikklg [1K]

I believe the correct answer would be "It has no energy because it is just sitting there."

I hope this helps! :D

8 0

3 years ago

Read 2 more answers

The _energy of the baseball is the sum of the kinetic energy and _energy of the particles that make up the baseball

Gennadij [26K]

Answer:

Mechanical energy

Kinetic energy

Explanation:

The mechanical energy is the sum of the kinetic and potential energy of the particles that make up the baseball.

Mechanical energy is made up of kinetic energy and potential energy. When the baseball is in motion, the particles make use of the kinetic energy, also known as motion energy and when the ball is not in motion the particles make use of the potential energy, also known as stored energy.

6 0

3 years ago