An unknown or changeable quantity is called a(n)...
An unknown compound contains only carbon, hydrogen, and oxygen (CxHyOz). Combustion of 2.50g of this compound produced 3.67g of carbon dioxide and 1.50g of water. How many moles of carbon, C, were in the original sample?
C + O2 = CO2
Molar mass CO2 = 44 g/mol
3.67 g CO2 * 1 mol / 44 g =
=0.0834 mol CO2 = 0.0834 mol C
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Answer is: mass.
Mass is a fundamental measure of the amount of matter in the object. Kilogram (symbol: kg) is the base unit of mass in the International System of Units.
The weight is the force of gravity on the matter. It is affected by gravity.
Volume is the amount of space that a substance occupies. It is affected by temperature.
Density is a measure of mass per unit of volume (for example grams per milliliter). It is affected by temperature.
An unknown and changeable quantity is known as an variable.
There are two types of quantities:
Quantities which can not be changed by changing physical parameters and their value is normally known.
These quantities can be changed by changing the physical parameters or conditions. Due to which they are unknown for particular conditions and have to be measured.
It caused by the attraction of the particles in the surface
Hope this helps
B.) Mixture called a solution.
A water molecule is composed of two hydrogen atoms and one oxygen atom arranged in a bent shape. Since oxygen is significantly more electronegative than hydrogen, oxygen atoms have a much stronger attraction to shared electrons than does hydrogen. This unequal sharing of electrons and bent shape results in water being called a _________________ . A) polar molecule B) magnetic molecule C) ionic molecule D) covalent molecule
Answer: A) polar molecule
Explanation: Polar molecules are molecules which contain atoms of different electronegativities.
Non polar molecules are molecules which contains atoms of same electronegativities.
Water is a polar covalent molecule formed by unequal sharing of electrons. Oxygen being more electronegative tend to keep the electron pair towards itself thus generating a partial negative charge. The hydrogen acquire a partial positive charge thus resulting in a polar molecule.
The bent shape is due to repulsion between lone pairs and bond pairs of electrons.
The answer is Abrasion
Question 7.7. All amino acids have a central carbon with four components attached to it. One of these components is called the R-group. Which of the following best describes the R-group? (Points : 3) The R-group helps the amino acid replicate. The R-group gives the amino acid unique characteristics. The R-group is the same in all amino acids. The R-group is what stabilizes the amino acid.
20x10^22 molecules / 6.023x10^23 molecules per mole = 0.33 moles.
For addition information, Bessemer process is a steel-making process, now largely superseded, in which carbon, silicon, and other impurities are removed from molten pig iron by oxidation in a blast of air in a unique tilting retort
In chemistry class, you are given a density column with golden syrup, water, and oil. Your teacher gives you an unknown substance. The unknown substance is a solid, and it has been determined that the density of the unknown is 7.50 g/cm3. If this unknown solid was placed into the density tube, which of these best describe the outcome? A) It would float on top of the oil. B) It would sink directly to the bottom. C) It would rest between the oil and the water. D) It would float between the oil and the golden syrup.
mixture is the answer
"Which piece of evidence would suggest an unknown substance is an ionic compound? " It conducts electricity when dissolved in water. It is a liquid at room temperature. It is a gas at room temperature. It has a low melting point.
When dissolved, they split into ions that are charged and have a positive or a negative charge. They can be either liquid or solid depending on the size of the molecules, while gasses don't occur. They have high melting and boiling points.
Answer: Cross breeding
Explanation: Cross breeding can be defined as the method by which two plants can be crossed to produce the desired character and compensate the useless characters shown by the plants individually.
Suppose a plant produces pink flower but small slower and another plant produces white flower but big flower.
If we want big pink colored flower then, these two plants can be crossed among each other so to produce the desired characters and hide the useful characters.
(1.05 g) / (1.45 L) = 0.724 g/L
The volume of a given quantity of a gas must increase if: A the temperature and pressure increase B the temperature and pressure decrease C the temperature increases and the pressure decreases D the temperature decreases and the pressure increases
Which of the following is not true of a covalent compound? It is made of only nonmetals. It has a very high melting point. It is formed when atoms share electrons in a chemical bond. It can also be called a molecule.
You walk in the front door of your house. you smell an onion that someone is cutting in the kitchen. explain why you are able to smell it, what this process is called, and what other types of substances exhibit this behavior.