1. Reactions follow the law of conservation mass.- T?
3. In a chemical equation, the material to the left of the arrow equals the material on the right.- T
8. In a single replacement reaction, sodium (Na) doesn't replace hydrogen.- F?
16. Increased pressure acting on a gas at a constant temperature will cause the volume to decrease.- T?
17. When a gas is under constant pressure and its temperature increases, its volume will increase.- F?
Thanks
-MC
17.
V/T = k or
V = kT
So if T goes up, V goes >>>>>/.
The rest are right?
Thanks
-MC
1. Reactions follow the law of conservation of mass. - T
To determine the answer, we need to understand what the law of conservation of mass is. The law states that matter cannot be created or destroyed in a chemical reaction, meaning that the mass of the reactants must be equal to the mass of the products. This is referred to as the law of conservation of mass.
To check if reactions follow this law, you can look at balanced chemical equations. If the number of atoms on the reactant side is equal to the number of atoms on the product side, then the law of conservation of mass is being followed. If this is the case, the answer is true.
3. In a chemical equation, the material to the left of the arrow equals the material on the right. - T
To answer this question, we need to understand how chemical equations are written. Chemical equations represent a reaction by showing the reactants on the left side of the arrow and the products on the right side.
In a balanced chemical equation, the number of atoms of each element on the left side must be equal to the number of atoms of the same element on the right side. This is done by adjusting the coefficients in front of each compound or element.
Therefore, the statement is true. The materials (reactants) to the left of the arrow in a chemical equation must be equal to the materials (products) on the right side of the arrow.
8. In a single replacement reaction, sodium (Na) doesn't replace hydrogen. - F
To determine the answer, we need to understand what a single replacement reaction is. In a single replacement reaction, also known as a displacement reaction, one element replaces another element in a compound.
Sodium, being a highly reactive metal, is capable of replacing hydrogen in certain compounds. For example, when sodium reacts with water (H2O), it replaces hydrogen and forms sodium hydroxide (NaOH) and hydrogen gas (H2).
Therefore, the statement is false. Sodium can replace hydrogen in certain single replacement reactions.
16. Increased pressure acting on a gas at a constant temperature will cause the volume to decrease. - T
To answer this question, we need to understand the relationship between pressure and volume of a gas, as described by Boyle's Law. According to Boyle's Law, at a constant temperature, the pressure and volume of a gas are inversely proportional.
When the pressure on a gas is increased, its volume decreases, and vice versa, as long as temperature remains constant. This can be observed in everyday situations, such as squeezing a balloon and reducing its volume when the pressure inside increases.
Therefore, the statement is true. Increased pressure acting on a gas at a constant temperature will cause the volume to decrease.
17. When a gas is under constant pressure and its temperature increases, its volume will increase. - F
To answer this question, we need to understand the relationship between temperature and volume of a gas, as described by Charles's Law. According to Charles's Law, at a constant pressure, the volume and temperature of a gas are directly proportional.
When the temperature of a gas increases, its volume also increases, and vice versa, as long as pressure remains constant. This can be observed when heating a gas-filled balloon, causing it to expand.
Therefore, the statement is false. When a gas is under constant pressure, an increase in temperature will cause its volume to increase, not decrease.