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3 years ago

Plz help will mark as brainliest CHOOSE THE CORRECT ANSWER

Chemistry

1 answer:

kodGreya [7K]3 years ago

8 0

Answer:

1. Is red blood cells

2. Is high pressure

Explanation:

In the atrium deoxygenated blood is pumped

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A 425.00-gram sample of a compound decomposes into 196.01 grams of carbon, 41.14 grams of hydrogen, 130.56 grams of oxygen, and

valentinak56 [21]

Answer:

C₈H₂₀O₄Si

Explanation:

The moles of each atom (Using atomic weight) are:

C: 196.01g × (1mol / 12.01g) = 16.32 moles of C

H: 41.14g × (1mol / 1.01g) = 40.73 moles of H

O: 130.56g × (1mol / 16g) = <em>8.16</em> moles of O

Si: 57.29g × (1mol / 28.09g) = <em>2.04</em> moles of Si

Dividing in the number of moles of Si to obtain the simplest ratio:

C: 16.32mol C / 2.04mol: 8

H: 40.73mol H / 2.04mol: 20

O: 8.16 mol O / 2.04mol: 4

Si: 2.04mol / 2.04mol: 1

Thus, empirical formula of the compound is:

<em>C₈H₂₀O₄Si</em>.

Molar mass for this formula is:

12.01g/mol × 8 + 1.01g/mol × 20 + 16g/mol × 4 + 28.09g/mol × 1 =

208.37 g/mol ≈ Molecular weight obtained in the experiment.

Thus, molecular formula of the compound is:

<em>C₈H₂₀O₄Si</em>

3 0

3 years ago

What is this element

ohaa [14]

Answer:

Oxygen

Explanation:

From the question given above, the following data were obtained:

Number of electrons = 8

Number of protons = 8

Number of Neutrons = 8

Name of element =?

Next, we shall determine the atomic number of the element. This can be obtained as follow:

The atomic number of an element is simply defined as the number of protons in the atom of the element. Mathematically, it is expressed as:

Atomic number = proton number

From the question given above,

Number of protons = 8

Therefore,

Atomic number = 8

Comparing the atomic number of the element (i.e 8) with those in the periodic table, we can conclude that the element is oxygen since no two elements have the same atomic number.

8 0

3 years ago

What is the formula of arsenic hexabromide?

Nady [450]

When dealing with compounds and their names, it helps to know the prefixes of some of the common compounds. For instance,

Mono- = 1
Di- = 2
Tri- = 3
Tetra- = 4
Penta- = 5
Hexa- = 6

And the list goes on.

However we are dealing with Arsenic Hexabromide:

That means we have 1 Arsenic with 6 Bromides:

$AsBr_{6}$

6 0

3 years ago

A) How much energy would be required to melt 500 grams of ice at 0°C to water at 0°C?

baherus [9]

Heat required = Q = 40 kcal

<h3>Further explanation</h3>

Given

mass of 500 g ice

Required

Heat required

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)
Q = m.Lv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

Lf for water = 334 kj/kg=6.01 kJ/mol = 80 cal/g

Phase change(ice to water)

Q= 500 g x 80 cal/g

Q = 40 kcal

4 0

3 years ago

List four physical properties of toothpaste

ra1l [238]

Abrasiveness is the most common property found in almost every toothpaste. The abrasiveness of a toothpaste is responsible for whitening action and removal of debris stuck on tooth enamel. The same abrasiveness can worsen the teeth sensitivity by damaging the tooth enamel. Relative Dentin Abrasivity (RDA) is used to measure a toothpaste’s abrasiveness.

Other physical properties considered in a toothpaste are as follows:

· Presence of fluoride

· pH

· Foaming ability

Fluoride is a key ingredient that delivers strength to the tooth enamel and fights to prevent tooth decay and gum diseases. Salt and sodium bicarbonate are some materials commonly found in a regular toothpaste. Make sure that your toothpaste contains a good amount of fluoride content. You can use any toothpaste but ensure that you have an effective toothbrush that can provide optimum oral hygiene.

5 0

4 years ago

Plz help will mark as brainliest CHOOSE THE CORRECT ANSWER ​

Plz help will mark as brainliest CHOOSE THE CORRECT ANSWER