Ask question

Ask question

All categories

3 years ago

6

A potassium-40 sample starts with 50 atoms, and 1.25 billion years later, there are 25 atoms. What is the half-life of potassium

-40?
A. 2.5 billion years
B. 25 years
C. 40 years
D. 1.25 billion years

1 answer:

guapka [62]3 years ago

5 0

D. 1.25 billion years

You might be interested in

The force that holds the moon in orbit is around the earth is called........ a.friction b.gravity c.motion d.velocity

4vir4ik [10]

B, because earths gravity if pulling on the moon and since velocity pulls it it’s like earth tied a string to the moon and the moon goes in a circle

7 0

2 years ago

Read 2 more answers

Lithium bromide is a(n) ___________.

bija089 [108]

Answer:

Ionic compound

Explanation:

Lithium gives away an electron and Bromine takes an electron

Hope this helps! :)

5 0

3 years ago

Match these items. 1. moles per liter of solution solute 2. spreading out Keq 3. substance being dissolved diffusion 4. general

Degger [83]

Answer:

1. moles per liter of solution - Molarity

2. spreading out - diffusion

3. substance being dissolved- solute

4. general equilibrium constant - Keq

5. the substance doing the dissolving in a solution - solvent

6. solubility product constant - Ksp

Explanation:

Number of moles of substance being dissolved in one liter of solution is defined as molarity

Solute is the substance which is dissolved and solvent is the substance into which the solute is dissolved. For example salt is solute and water is solvent.

Ksp defines the solubility product constant which indicates the equilibrium between a solid and solution and the number of ions of solid required to achieve this equilibrium.

Keq depicts the scenario where reactant and product concentrations are constant in a chemical reaction.

Hence, the correct match is

1. moles per liter of solution - Molarity

2. spreading out - diffusion

3. substance being dissolved- solute

4. general equilibrium constant - Keq

5. the substance doing the dissolving in a solution - solvent

6. solubility product constant - Ksp

8 0

3 years ago

What is the measurement 1043. L rounded off to two significant figures?

Sloan [31]

Answer:

1000L

Explanation:

the 1 is a sig fig and since the 0 is between the 1 and 4 its also a significant number. to round them off you look at the 0,then look back at the 4 since its less than 5 u round down. then u replace the 43 with 0's

3 0

3 years ago

What is the colour change when universal indicator is added to apple juice

kherson [118]

Answer:

red because its the flavor

Explanation:

5 0

2 years ago

Read 2 more answers