Hiiii! I was wondering about getting some help real quick.
1. A student mixed two clear liquids together in a beaker and a solid precipitate formed. His data is shown in the table below.
Liquid reactant A - 10g
Liquid reactant B - 17g
Beaker + solid product - 32g
What is the mass of the beaker?
A. 5g**
B. 10g
C. 15g
D. 17g
E. 32g
2. Sodium is a metal and chlorine is a poisonous gas. Neither is safe to eat. However, when sodium and chlorine combine, it produces edible table salt. What can be concluded?
A. Table salt has similar physical properties of both reactants.
B. Table salt is a metalloid with properties of both reactants.
C. Other ingredients have been added to make table salt safe.
D. Products are chemically different from reactants.**
3. Hydrogen gas (H2) and chlorine gas (Cl2) react to form hydrochloric acid (HCl). What is the correct balanced chemical equation for this reaction?
A. 2H2 + 2Cl2 -> HCl
B. H2 + Cl2 -> 2HCl**
C. 2H2 + Cl2 -> 2HCl
D. H2 + Cl2 -> HCl
4. According to the law of conservation of mass, what should the product side of this single replacement reaction look like?
Zn + 2HCl ->?
A. H2 ZnCl2
B. H2 + Zn + Cl2
C. H2 + ZnCl2**
D. ZnCl2
looks good
Hello! I'm here to help you with your questions. Let's tackle them one by one.
1. To find the mass of the beaker, we can use the law of conservation of mass. According to this law, the total mass of the reactants should be equal to the total mass of the products. In this case, the total mass of the reactants is 10g (liquid reactant A) + 17g (liquid reactant B) = 27g. The total mass of the beaker and solid product is given as 32g. To find the mass of the beaker, we can subtract the mass of the solid product from the total mass: 32g - (10g + 17g) = 32g - 27g = 5g. Therefore, the mass of the beaker is 5g. The correct answer is A. 5g.
2. From the given information, we can conclude that table salt is chemically different from the reactants (sodium and chlorine). Sodium is a metal and chlorine is a poisonous gas, but when they combine, they form table salt, which is safe to eat. Therefore, the correct answer is D. Products are chemically different from reactants.
3. To balance a chemical equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. In this case, we have two hydrogen atoms on the left side (2H2) and two chlorine atoms on the right side (2Cl2). To balance the equation, we need to add a coefficient of 2 in front of HCl. So the balanced equation is: H2 + Cl2 -> 2HCl. Therefore, the correct answer is B. H2 + Cl2 -> 2HCl.
4. In a single replacement reaction, one element replaces another element in a compound. In this case, zinc (Zn) replaces hydrogen (H) in hydrochloric acid (HCl). The balanced equation for this reaction is: Zn + 2HCl -> H2 + ZnCl2. Therefore, the correct answer is C. H2 + ZnCl2.
I hope that helps! Let me know if you have any more questions.