Considering the definition of density, you obtain that:
- Part A: the density of gold is 19.3 g/cm³.
- Part B: the density of iron is 7.8 g/cm³.
<h3>Definition of density</h3>
Density is defined as the property that allows to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
It can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
<h3>Density in this case</h3>
In this case, you know that:
- A sample of gold has mass of 38.6 grams and a volume of 2 cm³.
- A sample of iron has a mass of 46.8 grams and a volume of 6 cm³.
Replacing in the definition of density:
- Gold: density= 38.6 g÷ 2 cm³
- Iron: density= 46.8 g÷ 6 cm³
Solving:
- <u><em>Gold: density= 19.3 g/cm³</em></u>
- <u><em>Iron: density= 7.8 g/cm³</em></u>
In summary, the density of gold is 19.3 g/cm³ and the density of iron is 7.8 g/cm³.
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Answer:
Option C, The cell membrane allows water to enter and leave the cell.
Explanation:
Options for the question are –
A. The cell membrane is an impermeable barrier that prevents water from entering the cell.
B. The cell membrane allows solutes to enter the cell, which causes the cell to shrink.
C. The cell membrane allows water to enter and leave the cell.
D. The cell membrane removes solutes from the environment.
Solution -
The cell membrane is semi permeable to water and some other substances. Whenever there is a difference in concentration or volume on the two sides of the membrane, either the solute or the solvent starts moving till equilibrium is reached. In few cases, the flow continues uninterrupted thereby increasing the cell size to its maximum extent and hence bursting it.
Hence, option C is correct
The statement " If you do not follow the instructions for mixing,.....you are not complying with federal law" is TRUE
Disinfecting products are used to prevent and fight against disease causing organisms but they can be harmful to individuals when applied or used wrongly on the wrong surface or if they come in direct contact with human skin for a prolonged period.
The quantity of chemicals and proportion of chemicals used during the production of disinfecting products should follow a particular guideline as established by regulatory authorities. and if not followed would be violating federal law.
Hence we can conclude that the statement If you do not follow the instructions for mixing,..... is TRUE
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Answer:
1. carbon in CO2
2. Stroma of the chloroplast
3. Carbon dioxide
4. 3- phophoglycerate (PGA)
Explanation:
Develop into<span> gills or other body parts as the embryo </span>develops<span>. </span>backbone<span> ... the embryonic structure in chordates that is </span>usually<span> replaced by a </span>backbone<span>. bony fish.</span>
