Which of the following combinations of elements is most likely to produce covalent bonds?

a. hydrogen & helium

b. sodium & magnesium

c. fluorine & bromine

d. aluminum & bromine

Which of the following is a high wave that crashes down onto the ocean floor? a. breaker b. tide c. upwelling d. deflection

What are 3 items in matter?

Add these measurements, using significant digit rules: 1.0090 cm + 0.02 cm = cm

Which statement best describes a characteristic of gases?

On October 21, 2001, Ian Ashpole of the United Kingdom achieved a record altitude of 3.35 km (11 000 ft) powered by 600 toy balloons filled with helium. Each filled balloon had a radius of about 0.54 m and an estimated mass of 0.27 kg.

Which of galileo's observations most strongly supported a heliocentric cosmology? the phases of venus?

How can scientists know for sure that the cell theory is true? What evidence do we have to prove it

Two frisky grasshoppers collide in midair at the top of their respective trajectories and grab onto each other, holding tight thereafter. One is a robust 250 g beast initially moving south at 15.

A 50 kg child runs off a dock at 2.0 ms (horizontally) and lands in a waiting rowboat of mass 150 kg. At what speed does the rowboat move away from the dock?

A force of 15 N acts upon a 3 kg block. Calculate the acceleration of the object. Question 2 options: A. 75 m/s^2 B. 5 m/s^2 C. 45 m/s^2 D. 18 m/s^2