water boiling: solid water becoming gaseous water
water evaporating: liquid water becoming gaseous water
water freezing: liquid water becoming solid water
water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules
19 answers
The change that is chemical is:
water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules.
This process involves the breaking of chemical bonds in water to form new substances (oxygen and hydrogen), which is a characteristic of a chemical change.
The change that is chemical is:
water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules.
This process involves a chemical reaction where water (H₂O) is broken down into hydrogen (H₂) and oxygen (O₂) gases, which is a characteristic of a chemical change. The other options (boiling, evaporating, and freezing) are physical changes, as they involve changes in state but do not alter the chemical composition of water.
During photosynthesis, the number of carbon atoms remains unchanged in terms of composition.
While the number of water molecules, glucose molecules, and carbon dioxide molecules change during the process, the total number of carbon atoms in the reactants and products remains consistent with the balanced equation of photosynthesis.
In the overall reaction: 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂
There are 6 carbon atoms in the reactants (from carbon dioxide) and 6 carbon atoms in the product glucose (C₆H₁₂O₆). Thus, the number of carbon atoms remains unchanged.
The correct answer is:
D the number of carbon atoms.
During photosynthesis, the total number of carbon atoms remains constant. While the number of water molecules and carbon dioxide molecules changes, the carbon atoms from carbon dioxide are converted into glucose but the total number of carbon atoms involved in the reaction remains unchanged.
In a chemical reaction, the aspect of the reactants that changes is the:
arrangement of the atoms.
During a chemical reaction, the atoms are rearranged to form new products, but the total mass and the nuclei remain unchanged, as well as the names of the elements involved.
In a chemical reaction, the aspect of the reactants that changes is the:
arrangement of the atoms.
The atoms in the reactants are rearranged to form the products, but the nuclei, names of the elements, and total mass (which is conserved) do not change.
The increase in the snake's mass equals:
the mass of the mouse minus the mass of waste produced by the snake.
When a snake eats a mouse, it assimilates some of the mass of the mouse into its own body. However, not all of the mass from the mouse is converted into body mass, as some of it is lost as waste through digestion. Therefore, the net increase in mass would be the mass of the mouse minus the mass of waste produced.
The correct answer is:
D. the mass of the mouse minus the mass of waste produced by the snake.
This reflects the fact that while the snake consumes the mass of the mouse, not all of that mass is converted into body mass; some is lost as waste. Therefore, the increase in the snake's mass would be the mass of the mouse minus any waste produced.
To determine the missing coefficient for water in the equation for cellular respiration, we start with the balanced chemical equation:
\[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + ?H_2O + \text{Energy} \]
Count the number of atoms on each side:
Reactants:
Products (using 6CO₂):
Balance the equation:
We already have 6 carbons balanced on both sides.
Now we need to balance the oxygens:
The left side has 12 oxygen atoms. The right side already has 6 from 6CO₂. So, we need additional 6 oxygen atoms from water.
Since each water molecule (H₂O) contains 1 oxygen atom, we need 6 water molecules to account for the remaining 6 oxygen atoms.
Therefore, the balanced equation is:
\[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy} \]
So, the missing coefficient for water is:
6
To balance the equation for cellular respiration:
\[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + ?H_2O + \text{Energy} \]
Identify the elements and their counts on both sides of the equation.
Reactants:
Products:
Balance the atoms:
Since each water molecule (H₂O) contributes 1 oxygen atom, we need 6 water molecules to provide the additional 6 oxygen atoms.
Thus, the balanced equation becomes:
\[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy} \]
Therefore, the missing coefficient for water is:
6
