В, 2 столі невідомого елемента А но 7 електронів більше, ніж у йона Флуору. Визно невідомий елемент А то запиши формули сполук, утворені цим елементом, эко-
малентин полярии, неполяриин і йониим зв'язками. Зобрази схеми іх утворення.
Вирио пулені окиснения всіх елементів у сполуках.
Обчисли носові частки елемента А в кожній сполуці,

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s