Answer:
At the end of each organ system you will need to make a summary of that ... So how does the food we eat eventually get to our cells in a small enough form ... The circulatory system is responsible for transporting blood with oxygen (O2) ... the digestive system to the cells in the body and remove waste products to be excreted.
hope this helps!
The answer is carbon, silicone, germanium
The scientists research project with the goal of determining the sequence of chemical base pairs which make up human DNA, and of identifying and mapping<span> all of the genes of </span>the human genome<span> </span>
1: What is the smallest part of a compound called?
mixture
element
atom
molecule
2: One molecule is made of two or more _____ bonded together.
nuclei
mixtures
atoms
compounds
3: Which of the following is a pure substance that can't be separated by physical means, and can't be decomposed into other substances by chemical means?
compound
molecule
mixture
element
4: A substance that cannot be separated physically is called a substance
heterogenous mixture
homogenous mixture
pure substance
mixed substance
5: Which term below represents a pure substance that can be separated chemically, but cannot be separated physically, that is made up of two or more different atoms?
mixture
element
molecule
chemical bond
6: Water is formed when two hydrogen atoms bond to an oxygen atom.
True
The hydrogen and the oxygen in this example are different __True_____________.
Answer:
355.5 g.
Explanation:
- The balanced equation for the mentioned reaction is:
<em>2Al + 6HCl → 2AlCl₃ + 3H₂,</em>
It is clear that 2.0 moles of Al react with 6.0 mole of HCl to produce 2.0 moles of AlCl₃ and 3.0 mole of H₂.
- Firstly, we need to calculate the no. of moles of (87.7 g) of Al:
no. of moles of Al = mass/atomic mass = (87.7 g)/(26.98 g/mol) = 3.251 mol.
<em><u>Using cross multiplication:</u></em>
2.0 mol of Al need to react → 6.0 mol of HCl, from stichiometry.
3.251 mol of Al need to react → ??? mol of HCl.
∴ the no. of moles of HCl needed to react with (87.7 g) 3.251 mol of Al = (3.251 mol)(6.0 mol)/(2.0 mol) = 9.752 mol.
- Now, we can get the mass of HCl needed to react with (87.7 g) 3.251 mol of Al:
<em>mass of HCl = (no. of moles)(molar mass) </em>= (9.752 mol)(36.46 g/mol) = <em>355.5 g.</em>
