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3 years ago

8

strontium-90 has a half life of 29 years. if a site held 4000 kg of this isotope, approximately what mass of strontium-90 would

be left after 87 years?

1 answer:

Ludmilka [50]3 years ago

4 0

Answer:

125g

Explanation:

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Rank from smallest to largest <br> a) 5583 nm<br> b) 0.001 um<br> c) 100 cm<br> d)3.456 x 10^-9

kari74 [83]

Answer:

if it's helpful for you please mark me brainliest answer thanks

Explanation:

5583= 3.456= 100= 0.001

4 0

3 years ago

A 5 mole sample of liquid acetone is converted to a gas at 75.0°C. If 628 J are required to raise the temperature of the liquid

velikii [3]

The total energy required for this conversion is equivalent to the sum of the energies that are used. There are three steps:

1) Heating of liquid acetone
This used 628 J

2) Evaporation of acetone
This used 15.6 kJ or 15,600 J

3) Heating of acetone vapors
This used 712 J

Adding these quantities,

Total energy = 628 + 15,600 + 712

The total energy required was <span>16940 Joules of 16.94 kJ</span>

7 0

3 years ago

Why is an ecosystem still healthy although there's still a lot of consumers in it?

siniylev [52]

Answer:

because it is a sign that there are more producers for the consumers.

Explanation:

An ecosystem consist of the abiotic or inorganic components, the animals[consumers], the plants[producers] and the decomposers. An ecosystem simply means the environment of organisms that are living together and the way these organisms interact with another.

The producers that is the plants are the ones manufacturing food by themselves either by photosynthesis or chemosynthesis and the consumers are the ones relying on the producers for food.

The ecosystem is still healthy even when there's still a lot of consumers in it because it shows that there are come producers that is to say the producers are more also. If this is not the case, then the ecosystem will not be healthy as the consumers will eat the producers until the producers will not be enough.

3 0

3 years ago

A person's physical characteristics are determined by their

Sidana [21]

C. genes. genes are what parents pass down to their children

7 0

4 years ago

Read 2 more answers

Which statement best describes the electrons in this illustration?

ololo11 [35]

Answer:

Statement 3 is correct. the electrons are negatively charged particles located outside the nucleus

Explanation:

Step 1: Data

Electrons = Electrons are subatomic particles.

⇒They (usually) are negative charged.

⇒They are situated outside the nucleus.

⇒They are much smaller than the nucleus of the atom. (neutrons and protons)

Protons

⇒They (usually) are positive charged.

⇒They are situated inside the nucleus.

Neutrons

⇒They (usually)do not have a charge = neutral

⇒They are situated inside the nucleus.

Step 2:

1. the electrons are positively charged particles located outside the nucleus

⇒ False. Electrons are negative charged

2. the electrons are positively charged particles located inside the nucleus

⇒ False Electrons are negative charged and outside the nucleus

3. the electrons are negatively charged particles located outside the nucleus

⇒ This statement is TRUE

4. the electrons are negatively charged particles located inside the nucleus

⇒False. Electrons are located outside the nucleus

Statement 3 is correct. the electrons are negatively charged particles located outside the nucleus

5 0

4 years ago