Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án

Which group contains the alkaline earth metals, such as magnesium and calcium?

1. AGroup 2
2. BGroup 17
3. CGroup 1
4. DGroup 18

A cleaning solution has a pH of 12. How is it described?

1. AStrongly acidic
2. BNeutral
3. CWeakly acidic
4. DStrongly basic

Which of these is a chemical property?

1. AFlammability
2. BColour
3. CBoiling point
4. DDensity

Dung dịch có pH 3 so với dung dịch có pH 5 thì thế nào?

1. ACó số ion hydrogen bằng nhau
2. BCó ít ion hydrogen hơn 100 lần
3. CCó nhiều ion hydrogen hơn 2 lần
4. DCó nhiều ion hydrogen hơn 100 lần

In a closed container, 10 g of substance A reacts completely with 5 g of substance B. What is the total mass of the products?

1. A15 g
2. B10 g
3. C5 g
4. D50 g

Why is a carbon dioxide extinguisher effective on many fires?

1. ACO₂ reacts chemically with the fuel to make it non-flammable
2. BCO₂ is denser than air and pushes oxygen away from the fire
3. CCO₂ adds oxygen to cool the flames
4. DCO₂ is a liquid that soaks into the fuel

Why does a sodium ion (Na⁺) have almost the same mass as a sodium atom?

1. AThe ion gains a neutron that balances the loss
2. BThe only difference is one electron, which has a tiny mass
3. CIons and atoms always have exactly the same mass
4. DThe ion has one fewer proton, which has a tiny mass

Chlorine có hai đồng vị phổ biến, chlorine-35 (khoảng 75%) và chlorine-37 (khoảng 25%). Khối lượng nguyên tử trung bình của nó là bao nhiêu?

1. AĐúng 36
2. BKhoảng 36,5
3. CKhoảng 35,5
4. DĐúng 35