Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

Which is a sign that a chemical reaction may have taken place?

1. AA gas is produced when two liquids are mixed
2. BA block of wax melts when it is heated
3. CSugar dissolves completely when stirred into water
4. DWater freezes into ice when put in a freezer

What causes the pressure of a gas in a container?

1. AGas particles colliding with the container walls
2. BGas particles stopping and pushing outward
3. CGas particles sticking to the walls
4. DThe weight of the container pressing on the gas inside

What is radioactivity?

1. AThe release of radiation by unstable atomic nuclei
2. BThe flow of electrons through a metal wire
3. CThe release of heat and light when fuels burn in air
4. DThe glow produced by any hot object

A plastic block has a density of 0,8 g/cm³. What happens when it is placed in water (density 1,0 g/cm³)?

1. AIt dissolves
2. BIt stays suspended halfway down
3. CIt floats
4. DIt sinks

Why must temperatures be in kelvin in gas law calculations?

1. AKelvin values are always below 100
2. BGas volume and pressure are proportional to the absolute temperature
3. CThe kelvin scale has smaller degrees, which gives more precise answers
4. DCelsius can only be used for liquids

When the diaphragm contracts and the chest cavity gets bigger, what happens to the air pressure inside the lungs?

1. AIt rises, so air flows in
2. BIt falls, so air flows out
3. CIt does not change
4. DIt falls, so air flows in

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A3
2. B14
3. C11
4. D7

Using PV = nRT with R = 0,082 L·atm/(mol·K), how many moles of gas are in 24,6 L at 1 atm and 300 K?

1. A300 mol
2. B0,5 mol
3. C2 mol
4. D1 mol