Answer:
A. 0.65g/mL, float
Explanation:
Mass: 325g
Volume: 500mL
D = m/v
D = 325/500
D = 0.65
Therefore, the block has a density of 0.65g/mL and it will float since the density of water is greater than the density of the block.
The independent variables, the ones that are intentionally manipulated, are
A) temperature and surface area
The dependent variable, the one that you measure the response in, is
C) reaction time .
1 proton = 1 positive charge
1 electron = 1 negative charge
+21-19= <u>+3</u>
Answer:
<u>72.2 mL</u>
Explanation:
Here values of Volume (V), Pressure (P), and Temperature (T) are given : <u>before</u> and <u>after</u>.
<u>Equating LHS (before) to RHS (after)</u>
- P₁V₁/T₁ = P₂V₂/T₂
- V₂ = P₁V₁T₂/T₁P₂
- V₂ = 1.3 × 146 × 275 / 278 × 2.6
- V₂ = 73 x 275 / 278
- V₂ = <u>72.2 mL</u>
Answer:
The number of moles of hydrochloric acid are 0.861
Explanation:
In first solution, the [HCl] is 11.7 M, which it means that 11.7 moles are present in 1 liter.
So we took 25 mL and we have to know how many moles, do we have now.
1000 mL ____ 11.7 moles
25 mL _____ (25 . 11.7)/1000 = 0.2925 moles
This are the moles, we add to the solution where the [HCl] is 3.25 M
In 1000 mL __ we have __ 3.25moles
175 mL ____ we have __ (175 . 3.25)/1000 = 0.56875 moles
Total moles: 0.2925 + 0.56875 = 0.861 moles
