Explanation:
Jen runs at a little under 10m per second. Ann runs about 6m per second. Jen won because her time was faster. She reached 50m by 6 seconds while it took Ann 8 seconds. If the graph displayed their motion stopping, the line would continue straight horizontally along the 50m line as they would not be running anymore.
Answer:
0.416moles
Explanation:
Using the formula;
number of moles = mass ÷ molar mass
Molar mass of CO2 = 12 + 16(2)
= 12 + 32
= 44g/mol
According to the information in this question, there are 18.3g of CO2
number of moles (n) = 18.3/44
= 0.4159
= 0.416moles of CO2
The net ionic equation for the precipitation of calcium phosphate from aqueous solution is Ca²+ (aq)+ S²- (aq)=>CaS(s)-----> CaS(s).
<h3>How is a precipitation process expressed in a net ionic equation?</h3>
For a precipitation reaction, the net ionic equation is written by first knowing the precipitate, then use the solubility rules (if there are any).
Then one can write down the precipitate's formula that was made to the right of an arrow. The ions that react to get the precipitate as the reactants to the left of the arrow should have their formulas written down also:
Hence:
Since the molecular fomular is: H2S(aq) + CaCl2(aq) -------> CaS(s) + 2HCl(aq)
Then the full ionic equation will be: 2H^+(aq) + S²-(aq) + Ca²+(aq) + 2Cl^-(aq) -------> CaS(s) + 2H^+(aq) + 2Cl^-(aq)
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I found the choices:
A. The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.
B. The beam was attracted to a negative charge and repelled by a positive charge, showing that atoms contain small, positively charged particles.
C. The beam was positively charged and had significant mass, showing that atoms have a positive, dense nucleus.
D. The beam was neutral and had significant mass, showing that atoms contain neutral particles in the nucleus.
Answer:
A. The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.
Explanation:
J.J Thomson in 1897 carried out experiments on the gas discharge tube which led to the discovery of cathode rays also known as electrons. He observed the following properties:
- the rays move in a straight line and they cast a shadow of an object along their path.
- they cause mechanical paddles to rotate because they posses kinetic energy.
- they attract positive charges and repel negative charges.
The last property led the plum pudding model of the atom. In this model Thomson suggested an atom as pool of electron surrounded by positive charges based on the fact that cathode rays attracts positive charges.