Investigating iron thiocyanate requires several chemicals which must be used with caution. using knowledge of these chemicals, select whether the following statements are true or false. when handling hno3, it is important to wash your hands frequently since hno3 is corrosive and can cause burns. to dilute an acid, always add water to add while slowly stirring. fe(no3)3 should be handled with caution because it is an oxidizer and can irritate the skin. kscn is completely nontoxic if kscn is strongly heated it will cause the evolution of cyanide gas. kscn, if combined with a strong base, will also cause the evolution of cyanide gas.

1. False

2. False

3. True

4. False

5. False

6. False

Explanation:

1. Because HNO₃ is corrosive when handling it is important to use gloves and also protection glasses. If it touches the skin, then it's important to wash the area affected.

2. The dilute of acid is exothermic, so it releases a huge amount of heat. For precaution, the acid must be added at the water slowly stirring, so it can be controlled.

3. Fe(NO₃)₃ is an oxidizer and in contact with the skin it can cause irritation, so it must be handled carefully and with protection.

4. KSC can irritate the eyes, so it's toxic.

5. KSCN is not inflammable and it's not combustible, so when heated it will only change the state for gas, but it will not cause the evolution of cyanide gas.

6. If KSCN reacts with a strong base, it will dissociate, and the ions SCN⁻, which can't react with the OH⁻ ions of the base. So, it will only cause the evolution of cyanide gas if it reacts with a strong acid.

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.