Which physical method can separate a mixture of steel ball bearings and marbles

Which groups of metals tend to have more than one oxidation number?

1. a reaction that absorbs energy 1 endothermic 2. a reaction that releases heat precipitate 3. the amount of heat released or absorbed by a reaction 2 exothermic 4.

What is the volume, in liters, occupied by 2.79 moles of N2 gas at 439 mmHg pressure and a temperature of 64°C?

Soil erodes naturally, but human activities can greatly speed the rate of soil erosion, leading to diverse ecological effects and to potentially severe impacts on agricultural production.

The illuminance on a surface is 6 lux and the surface is 4 meters from the light source. What is the intensity of the source? A. 24 candelas B. 144 candelas C. 72 candelas D. 96 candelas

Which statement is true for a pure compound but NOT true for a pure element?

Which one is uncelluar and which is multicelluar? crab or pond organism

An atom of lithium loses an electron. What is the effect of this event? Group of answer choices The atom of a different element is formed. The atom of lithium acquires no charge. The atom of lithium becomes a positively charged ion.

Water interacts with polar substances like - OH groups but not with non-polar substances like methyl (-CH3) or ethyl groups (-CH2). Using this information, select the molecules that will easily dissolve in water based on polarity not on size.

Which of the following statements is not considered weather? The wind is blowing 20 miles per hour right now in Kansas. It is raining in Seattle. It is usually humid in Florida. It is snowing in Colorado.