All categories

2 years ago

Which are characteristics of natural selection? Select three options.

Chemistry

1 answer:

Luda [366]2 years ago

5 0

Affects populations,
Occurs when there is genetic variation
Selects organisms with certain traits to survive.

You might be interested in

Imagine that you and your friend are at the beach. You have your chairs and umbrella set up in the perfect spot near the water s

sineoko [7]

Answer:

High tides and low tides are caused by the moon. The moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the moon and the side farthest from the moon. ... When you're not in one of the bulges, you experience a low tide.

8 0

2 years ago

Which scientist is credited with first stating that electrons orbit an atomic nucleus

LenaWriter [7]

The scientist which was credited with first stating that electrons orbit an atomic nucleus was Niels Henrik David Bohr. He was the proponent of the Bohr model of the atom, wherein he states that energy level of electrons are distinct and that electrons revolve on stable orbits within the atomic nucleus but can actually transfer from one orbit (level) to another. The orbitals are called: s, p, d and f orbitals.

8 0

3 years ago

The density of quartz mineral was determined by adding a weighed piece to a graduated cylinder containing 50.3 mL water. After t

sergij07 [2.7K]

<u>Answer:</u> The density of the quartz is 2.68 g/mL

<u>Explanation:</u>

We are given:

Volume of graduated cylinder = 50.3 mL

Volume of quartz + graduated cylinder = 64.8 mL

Volume of quartz = [64.8 - 50.3] mL = 14.5 mL

To calculate the density of substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Mass of quartz = 38.9 g

Volume of quartz = 14.5 mL

Putting values in above equation, we get:

$\text{Density of quartz}=\frac{38.9g}{14.5mL}\\\\\text{Density of quartz}=2.68g/mL$

Hence, the density of the quartz is 2.68 g/mL

8 0

3 years ago

Read 2 more answers

A 60g sample of tetraethyl lead, a gasoline additive, is found to contain 38.43g lead, 17.83g carbon and 3.74g hydrogen. Determi

anastassius [24]

Answer:

Empirical formula (which matches the molecular formula) is = PbC₈H₂₀

Explanation:

Our sample: 60 g of tetraethyl lead

In order to determine the compound empirical formula we need the centesimal composition:

(Mass of element / Total mass) . 100 =

(38.43 g lead / 60g ) . 100 = 64.05%

(17.83 g C / 60g) . 100 = 29.72%

(3.74 g H / 60g) . 100 = 6.23 %

These % are the mass of the elements in 100 g of compound. Let's find out the moles of them:

64.05 g / 207.2 g/mol = 0.309 moles

29.72 g / 12 g/mol = 2.48 moles

6.23 g/ 1 g/mol = 6.23 moles

Next, we divide the moles, by the lowest value of them (0.309)

0.309 / 0.309 = 1 mol Pb

2.48 / 0.309 = 8 mol C

6.23 / 0.309 = 20 mol H

There, we have our formula PbC₈H₂₀

6 0

3 years ago

What are the answers to these questions?

Andreas93 [3]

The only one i know
#7 Is TAXONOMY

3 0

3 years ago