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3 years ago

Which is most likely why many scientist reject the cold fusion theory

Chemistry

1 answer:

spin [16.1K]3 years ago

7 0

Answer:

There is too much waste involved in the process. Cold fusion experiments have been conducted at room temperature only. The process does not produce enough energy to meet the needs of modern humans.

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A. property is a characteristic of a pure substance that can be observed without changing the substance into some thing else

wlad13 [49]

The answer is physical property.

Physical properties are the properties that does not require the substance changing into another substance, which is, chemical change. Physical properties are usually observable and measurable, such as melting points, density, odor, color etc. These does not require a chemical reaction to happen.

The opposite of physical property is chemical property, which is how the substance changes to another. Such as how sodium reacts with water to make sodium hydroxide and hydrogen.

7 0

3 years ago

Which are the more common types of solutions?

aniked [119]

Hey there! :

1) Solid Solutions

Solid solutions are formed only by solutes and solid solvents. In everyday life, the main examples of this type of solution are metallic alloys.

2) Liquid Solutions

Liquid solutions have liquid solvent, usually water, and solutes can be solid, liquid or gaseous.

3) Gaseous solutions

This kind of solution is formed by the only mixture of gases. Air is an example, as its approximate composition is 78% nitrogen gas, 21% oxygen gas and 1% of other gases.

5 0

4 years ago

A block of aluminum occupies a volume of 15ml and weighs 40.5 g, what it its density?

san4es73 [151]

<h2>Answer:3 $gmL^{-1}$ </h2>

Explanation:

Let $v$ be the volume of the given material.

Let $m$ be the mass of the material.

Let $d$ be the density of the material.

Density of a material is defined as the ratio of its mass to its volume.

$d=\frac{m}{v}$

Given,

$m=45g\\v=15ml$

So, $d=\frac{45}{15}=3gmL^{-1}$

5 0

3 years ago

a compound containing only carbon and hydrogen produces 1.80 gCO2 and 0.738 gH2O. Find the empirical formula of the compound. Ex

r-ruslan [8.4K]

Answer:

The empirical formula is CH2

Explanation:

Step 1: Data given

Mass of CO2 produced = 1.80 grams

Mass of H2O produced = 0.738 grams

Step 2: The balanced equation

CxHy + O2 → CO2 + H2O

Step 3: Calculate moles CO2

Moles CO2 = mass CO2 / molar mass CO2

Moles CO2 = 1.80 grams / 44.01 g/mol

Moles CO2 = 0.0409 moles

Step 4: Calculate moles C

In 1 mol CO2 we have 1 mol CO2

In 0.0409 moles CO2 we have 0.0409 mol C

Step 5: Calculate moles H2O

Moles H2O = mass H2O / molar mass H2O

Moles H2O = 0.738 grams / 18.02 g/mol

Moles H2O = 0.04095 moles

Step 6: Calculate moles H

In 1 mol H2O we have 2 moles H

In 0.04095 moles H2O we have 2*0.04095 = 0.0819 moles H

Step 7: Calculate the mol ratio

We divide by the smallest amount of moles

C: 0.0409 / 0.0409 = 1

H: 0.0819 moles / 0.0409 = 2

The empirical formula is CH2

4 0

3 years ago

Explain how the number of chromosomes per cell is cut in half during meiosis in which the diploid parent cell produces haploid d

Igoryamba

The number of chromosomes per cell is cut in half during meiosis by separation of homologous chromosomes in a diploid cell which become haploid cells.

: )

3 0

3 years ago