Answer:
The correct answer will be- by providing different amount of water to experimental groups.
Explanation:
The scientific experimental samples are divided into two groups: the control group in which the variable to be studied is kept constant and the experimental variable to which different amount of studied variable is provided.
In the given question, the scientific question is how much amount of water is required for the optimal growth of the plants. The variable to be studied is water, so different amount of water is provided to different pots like 10 ml, 20 ml, 30 ml and so on. So the plant which will respond best to this amount will be the optimal concentration of the water required by the plant to grow.
It will take 10 years for the account to double in value.
Account is defined as a record in an accounting system that keeps tabs on the financial transactions involving a particular asset, obligation, equity, source of income, or expense. It is used to document financial transactions, totals, or balances related to assets, liabilities, income, outlays, and owner equity.
Given future value = 2 x 5,000 = $10,000
Present value = $5,000
Interest rate = 7%
n = number of periods to double in value
The value of n can be calculated as
FV = PV x ( 1 + r ) ⁿ
10,000 = 5,000 x ( 1 + 0.07 ) ⁿ
2 = 1.07 ⁿ
n = ln ( 2 ) / ln ( 1.07 )
n = 10.24
Thus, it will take 10 years for the account to double in value.
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The percent by mass of carbon in acetic acid (HC2H3O2) is calculated using the molar masses of its constituent elements. Upon calculation, it is determined that the percent by mass of carbon in acetic acid is 40.00%.
To calculate the percent by mass of carbon in acetic acid (HC2H3O2), we need to use the molar masses of the elements involved. The formula for acetic acid includes two carbon atoms, four hydrogen atoms, and two oxygen atoms. Using the given molar masses (carbon: 12.01 g/mol, hydrogen: 1.008 g/mol, oxygen: 16.00 g/mol), the molar mass of acetic acid can be calculated as follows:
Adding these together gives the molar mass of acetic acid as 60.052 g/mol.
To find the percent by mass of carbon, we take the total mass of carbon in the compound and divide it by the total molar mass of the compound:
(24.02 g/mol / 60.052 g/mol) × 100% = 40.00%
Therefore, the percent by mass of carbon in acetic acid is 40.00%.
(2) donates an H+ (4) donates an H-
According to the Brønsted-Lowry acid-base theory, water is acting as an acid when a water molecule donates an H+ ion. This also illustrates that water can behave as both an acid and a base due to its amphoteric nature.
According to the Brønsted-Lowry theory of acids and bases, water acts as an acid when a H2O molecule donates an H+. This is because an acid is defined as a substance that can donate a proton, which is a hydrogen ion (H+). Water (H2O) can act as both an acid and a base due to its amphoteric nature, but in this context where we have to choose between these four options, water acts as an acid when it donates an H+. An example of this is when water donates an H+ to ammonia (NH3), producing the ammonium ion (NH4+) and a hydroxide ion (OH-).
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Answer:the correct options are A (H⁺(aq)) and E (Mg₃(PO₄)₂(s)).
Explanation:To determine which substances are present in the net ionic equation for the reaction between MgCl2(aq) and H3PO4(aq), we first need to write the balanced molecular equation and then separate it into ions to identify the spectator ions. Spectator ions are those ions that do not participate in the chemical reaction and remain unchanged.
First, let's write the balanced molecular equation:
MgCl2(aq) + 2H3PO4(aq) -> Mg3(PO4)2(s) + 6HCl(aq)
Now, let's break down the equation into ions:
Mg²⁺(aq) + 2Cl⁻(aq) + 2H₃PO₄(aq) -> Mg₃(PO₄)₂(s) + 6H⁺(aq) + 6Cl⁻(aq)
Now, let's identify the spectator ions, which are the ions that appear on both sides of the equation and do not change:
- Mg²⁺(aq) is present on both sides.
- Cl⁻(aq) is present on both sides.
So, the spectator ions are Mg²⁺(aq) and Cl⁻(aq).
Now, let's determine the substances that are part of the net ionic equation, excluding the spectator ions:
Net Ionic Equation: 2H₃PO₄(aq) -> Mg₃(PO₄)₂(s) + 6H⁺(aq)
From the net ionic equation, the following substances are present:
A. H⁺(aq)
E. Mg₃(PO₄)₂(s)
So, the correct options are A (H⁺(aq)) and E (Mg₃(PO₄)₂(s)).
The other ions and compounds do not participate directly in the net ionic reaction and are spectator ions.
The statement that best describes J. J. Thomson's plum-pudding model is; an atom consists of positively charged matter that contains negatively charged particles.
The model of J. J. Thomson looked at the atom merely as a ball of positive charges into which negative charges were embedded.
This model was propounded by J. J. Thomson in the year 1897. This model began the journey into empirical observation of the structure of the atom.
Thompson further carried out his experiments using a cathode ray tube and propounded the model shown in the image attached to this answer.
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Answer:
An atom consists of positively charged matter that contains negatively charged particles.
Explanation:
b.As reactants form products, the potential energy increases.
c.Thermal energy is transferred from the product to the reacting substances.
d.Thermal energy is transferred from the surroundings to the reacting substances.
Answer:
As reactants form products, the potential energy decreases.
Explanation:
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