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3 years ago

What metric unit is used to measure distance?

Chemistry

2 answers:

IgorC [24]3 years ago

7 0

The basic unit of distance is the centimeter (cm). There are 100 centimeters in a meter and 1000 meters in a kilometer.

svet-max [94.6K]3 years ago

3 0

the basic unit of distance is the centimeter (cm) There are 100 centimeters in a meter and 1000 meters in a kilometer.

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Name the stellar process in which the fusion of hydrogen produces other elements.

Vilka [71]

<span>Hydrogen fusion generates the energy for proton - proton chains and the carbon nitrogen oxygen cycle. It is the nuclear fusion of 4 protons to form a helium 4 nucleus.</span>

3 0

3 years ago

If 20.0 mL of glacial acetic acid (pure HC2H3O2HC2H3O2) is diluted to 1.70 L with water, what is the pH of the resulting solutio

Andreas93 [3]

Answer:

The answer to your question is pH = 0.686

Explanation:

Data

Acetic acid = 20 ml

Final volume = 1.7 L

pH = ?

density = 1.05 g/ml

Process

1.- Calculate the mass of acetic acid

density = mass / volume

mass = density x volume

mass = 1.05 x 20

mass = 21 g

2.- Calculate the moles of acetic acid (CH₃COOH)

Molar mass = (12 x 2) + (16 x 2) + (4 x 1)

= 24 + 32 + 4

= 60 g

60 g of acetic acid ---------------- 1 mol

21 g of acetic acid ----------------- x

x = (21 x 1) / 60

x = 0.35 moles

3.- Calculate the concentration

Molarity = 0.35 moles / 1.70 L

= 0.206

4.- Calculate the pH

pH = -log[0.206]

pH = 0.686

6 0

3 years ago

Two cylinders are made of the same material. Cylinder A is one-fourth (1/4) the length of cylinder B and it has a radius that is

tankabanditka [31]

Answer:

$M_{A}$ : $M_{B}$ = 4 : 1

Explanation:

Given that:

Volume of a cylinder = $\pi$ $r^{2}$ h

For cylinder A, $l_{A}$ = $h_{A}$ = $\frac{1}{4} l_{B}$ and $r_{A}$ = 4 $r_{B}$ .

Volume of cylinder A = $\pi$ $(4r_{B}) ^{2}$ × $\frac{1}{4} l_{B}$

= 4 $\pi$ $r_{B} ^{2}$ $l_{B}$

Volume of cylinder B = $\pi$ $(r_{B}) ^{2}$ $l_{B}$

= $\pi$ $r_{B} ^{2}$ $l_{B}$

To determine the ratio of their masses, density (ρ) is defined as the ratio of the mass (M) of a substance to its volume (V).

i.e ρ = $\frac{M}{V}$

Thus, since the cylinders are made from the same material, they have the same density (ρ). So that;

density of A = density of B

density of A = $\frac{M_{A} }{4\pi r_{B} ^{2}l_{B} }$

density of B = $\frac{M_{B} }{\pi r_{B} ^{2}l_{B} }$

⇒ $\frac{M_{A} }{4\pi r_{B} ^{2}l_{B} }$ = $\frac{M_{B} }{\pi r_{B} ^{2}l_{B} }$

The ratio of mass of cylinder A to that of B is given as;

$\frac{M_{A} }{M_{B} }$ = $\frac{4\pi r_{B} ^{2} l_{B} }{\pi r_{B} ^{2} l_{B} }$

⇒ $\frac{M_{A} }{M_{B} }$ = $\frac{4}{1}$

Therefore, $M_{A}$ : $M_{B}$ = 4 : 1

8 0

3 years ago

Read 2 more answers

The first stage in writing your paper is to make a list of questions that will enable you to research the topic. Your paper shou

Stella [2.4K]

Answer: There are two questions I could think of that weren't already on this list.

1) When did the genetic diversity of koalas decrease?

2) What kind of DNA does a koala have?

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2 years ago

Discoveries made by scientists that led to the cell theory

xeze [42]

Answer:

Three scientists are credited with the development of cell theory. Matthias Schleiden observed that all plants were made of cells; Theodor Schwann observed that all animals were also made of cells; and Rudolf Virchow observed that cells only come from other cells.

Explanation:

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3 years ago