Can anyone help w this?

Diamond will scratch quartz. true or false

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2