ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Between which kinds of elements do covalent bonds usually form?

1. AA metal and a nonmetal
2. BTwo group 1 metals
3. CA metal and a noble gas
4. DTwo nonmetals

According to the Arrhenius definition, what does an acid produce in water?

1. AOxide ions (O²⁻)
2. BHydroxide ions (OH⁻)
3. CSodium ions (Na⁺)
4. DHydrogen ions (H⁺)

According to collision theory, what must happen for particles to react?

1. AThey must stay completely still next to each other
2. BThey must collide with enough energy and the right orientation
3. CThey must have the same mass
4. DThey must both be in the solid state at the same time

For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?

1. AThere is no effect on the equilibrium
2. BThe equilibrium shifts to the left, toward N₂ and H₂
3. CThe NH₃ breaks down completely
4. DThe equilibrium shifts to the right, toward NH₃

How many lone (non-bonding) pairs of electrons are on the oxygen atom in a water molecule?

1. A2
2. B1
3. C4
4. D0

How is 0.00045 written in scientific notation?

1. A4.5 × 10⁻³
2. B4.5 × 10⁴
3. C4.5 × 10⁻⁴
4. D4.5 × 10⁻⁵

Why is Dmitri Mendeleev's early periodic table regarded as such a success?

1. AHe proved that the atoms of every element contain electrons
2. BHe arranged the elements by atomic number, which he had discovered
3. CHe left gaps and correctly predicted the properties of elements not yet discovered
4. DHe discovered the noble gases and placed them in group 18

ไอโซโทปสองชนิดของธาตุเดียวกันแตกต่างกันในสมบัติใด

1. Aปฏิกิริยาเคมีที่เข้าร่วม
2. Bเลขอะตอม
3. Cจำนวนอิเล็กตรอนในอะตอมที่เป็นกลาง
4. Dเลขมวล