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3 years ago

Who was charles darwin

2 answers:

7 0

Here are some facts about Charles Darwin:

.Born Feb 12, 1809
.Died April 19, 1882
.He was famous for natural selection
.He was knower as the father of evolution
.Charles Darwin Influenced the Early History of Psychology

Charles Darwin was knower for the theory of evolution about birds and natural selection he did expierment on dead birds because the same birds had a different shape of beak from each other and that's were he came up with the theory of evolution about the birds and their beaks.

Verdich [7]3 years ago

5 0

Charles Darwin was a Geologist, biologist and is best known for his contributions to science of evolution.

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What mass, in grams, of oxygen gas (o2) is contained in a 8.5-liter tank at 32.0 degrees celsius and 3.23 atmospheres?

e-lub [12.9K]

For this problem we assume that oxygen is an ideal gas. So, we use the equation PV=nRT where P is pressure, V is the volume, n is the number of moles, R is a universal constant and T is the temperature. We first solve for the number of moles n. Then, using the molar mass of oxygen we convert it to grams.

PV=nRT
n = PV / RT
n = 3.23 (8.5) / 0.08206 (32+273.15)
n = 1.0964 mol

mass = 1.0964 mol (32g / 1 mol) = 35.09 g O2

5 0

3 years ago

In tne equation below identify the bronsted lowry acid bronsted lowry base conjugate acid conjugate base

Ad libitum [116K]

Answer:

Brønsted-Lowry acid: HNO₂

Brønsted-Lowry base: NH₃

Conjugate acid: NH₄⁺

Conjugate base: NO₂⁻

Explanation:

The equation is:

$HNO_2(aq)+NH_3(aq)\rightarrow NH4^+(aq) + NO2^-(aq)$

Brønsted-Lowry acids are H⁺ donors.

Brønsted-Lowry bases are H⁺ acceptors.

Thus, on the left side, HNO₂ is the acid and NH₃ is the base.

The conjugate acids and conjugate bases are on the right side of the equation.

The conjugate acid is the spieces that is formed after a base accepts the proton; thus it is NH₄⁺. A conjugate acid contains one more H atom and one more + charge than the base that formed it.

The conjugate base is the species that is formed after the acid donates its proton; thus, NO₂⁻ is the conjugate base. A conjugate base contains one less H atom and one more - charge than the acid that formed it.

Summarizing:

Brønsted-Lowry acid: HNO₂

Brønsted-Lowry base: NH₃

Conjugate acid: NH₄⁺

Conjugate base: NO₂⁻

6 0

3 years ago

A block has a mass of 30g and dimensions of 1.5cm by 4.8cm by 2.3cm. Calculate the density (round to TWO sig figs).

adelina 88 [10]

Answer:

1.8g/cm³

Explanation:

Density is defined as the ratio of the mass of a substance and the space this subtance occupies. It is usually given in g/cm³.

The mass of the block is 30g.

The volume this mass occupies is 1.5cm × 4.8cm × 2.3cm = 16.56cm³.

The density is:

30g / 16.56cm³ =

5 0

3 years ago

Momentum depends on both mass and velocity

maks197457 [2]

That statement is true
Momentum is equal to mass times Velocity.
Let's take throwing rocks for example. The force of momentum that created by throwing rocks will creates more damage if the rock is heavier in mass and threw at a faster speed.

6 0

3 years ago

Which is a characteristic of a solution?

frez [133]

It is homogeneous mixture of two non reactive substance.

5 0

3 years ago