Tema
Q:
In an ionic bond, the charge on the cation (i.e. the metal) is
always positive.
always negative.
either positive or negative.
Q:
Which one of these compounds is an ionic compound?
Na 2 O
CO 2
N 2
Q:
According to the octet rule, a bromine atom has a tendency to
lose one electron.
lose two electrons.
gain one electron.
Q:
A statement about mass always being conserved in a chemical reaction is an example
of a
hypothesis
theory
law
Q:
Which is of the following is an example of a chemical property?
water boils at \( 100^{\circ} \mathrm{C} \)
acids are sour and bases are bitter
an iron nail rusts
Q:
10. In chemistry, the pH of a substance is defined as \( p H=-\log \left[H^{+}\right] \),
where \( \boldsymbol{H}^{+} \)is the hydrogen ion concentration in moles per liter. Tomatoes have a
hydrogen ion concentration of \( 6.3\left(10^{-5}\right) \); what is the pH of tomatoes?
Q:
Question 10 of 10
What is the hybridization of the carbon in \( \mathrm{CO}_{2} \) and bond order of the \( \mathrm{CO}_{2} \)
molecule?
Q:
\( CH _ { 4 } + O _ { 2 } \rightarrow \)
Q:
\( H _ { 3 } C _ { 6 } H _ { 5 } O _ { 2 } + 3 NaOH \rightarrow Na _ { 3 } C _ { 6 } H _ { 5 } O _ { 7 } + 3 H _ { 2 } O \)
Q:
\( \left. \begin{array} { l } { H _ { 3 } C _ { 6 } H _ { 5 } O _ { 7 } + 3 NaOH \rightarrow Na _ { 3 } C _ { 6 } H _ { 5 } O _ { 7 } + 3 H _ { 2 } O } \\ { \frac { 0,1 moles NaOH } { 1 L } \times 2 mLL \times \frac { 1 L } { 1000 } = 0,002 moles NaO } \end{array} \right. \)
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