A. DIRECTIONS: Modified TRUE or FALSE Write TRUE if the statement is correct. If incorrect, change the underlined word/s to make the statement correct. Write your answer on the space provided. 1. Lava pushes up rocks from underneath. 2. Magma flows out of the vents and crater of the volcano. 3. Volcanic eruption occurs when pressure decreases inside a volcano. 4. Pyroclastic materials like lava, ashes, and rocks spread around a volcano. 5. Lahar or mudflow carries materials of all sizes, from ash to boulders, to nearby rivers and lakes when heavy rain occurs.

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]