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Because q=n*C*deltaT, and neither moles nor molar heat capacity can be negative, a negative q would mean that delta T is negative. So yes, a negative q means that temperature is decreasing. A negative deltaU does not necessarily mean temperature is decreasing because deltaU=q+w. So even if q was positive (meaning an increase in temperature), the value of work could be negative enough to make deltaU a negative value.
a negative q does not necessarily mean that the temperature will decrease as shown by the heat curve: The diagonal lines indicate an increase/decrease in temperature as a result of the change in energy, the flat parts of the graph show that energy is being added/removed however the temperature does not change (hence the flat line).
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