3 years ago

What is a pure substance

Chemistry

1 answer:

Allisa [31]3 years ago

7 0

Answer:

a substance that has a definite chemical composition that cannot be changed through physical or chemical means

Hope this helped!

You might be interested in

What does the state symbol (aq) mean when written after a chemical

vlabodo [156]

B. it means the compound is dissolved in water

4 0

3 years ago

What will happen when a star loses so much mass that its gravity becomes weaker? O A. The star will get hotter O B. The star wil

faust18 [17]

Answer: C

Explanation:

6 0

3 years ago

The density of osmium, which is the densest metal, is 22.57 g/cm^3. What is the mass of a block of osmium that measures 1.00 cm

olganol [36]

Density = Mass / Volume
V = 1.00 * 4.00 * 2.50 = 10 cm³
22.57 g/cm³ = Mass / 10 cm³
M = 22.57 g/cm³ * 10 cm³
M = 225.7 g
Answer: The mass of the block of osmium is 225.7 g.

7 0

3 years ago

Read 2 more answers

Which metal can replace another metal in a reaction?

deff fn [24]

Answer:

O A. A metal higher on the activity series list will replace one that is

lower.

4 0

3 years ago

Element X is a radioactive isotope such that every 82 years, its mass decreases by half. Given that the initial mass of a sample

lesantik [10]

Answer: 17 years

Explanation:

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

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

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

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

$k=\frac{0.693}{82years}=8.4\times 10^{-3}years^{-1}$

b) for 8900 g of the mass of the sample to reach 7700 grams

$t=\frac{2.303}{8.4\times 10^{-3}}\log\frac{8900}{7700}$

$t=17years$

Thus it will take 17 years

4 0

3 years ago

What is a pure substance​

What is a pure substance