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Ratling [72]
3 years ago
6

Fertilizers have nutrients that help plants grow. Sometimes, when it rains, fertilizers are washed away from farmland into ponds

and lakes. This promotes the growth of algae, a type of plant, present in the water. It is observed that algae grow very fast and cover the surface of the pond completely. They use up all the dissolved oxygen in the pond. How does this affect the other organisms in the pond?
A) They start eating algae.
B) They do not get enough oxygen, and die.
C) They get entangled in the algae, and die.
D) They leave the pond and go to live elsewhere.
Chemistry
2 answers:
vova2212 [387]3 years ago
5 0
B) They loose oxygen due to the algae , as it says , the algae bloom uses up all the O2
Alexxx [7]3 years ago
5 0

The correct answer is B

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The energy changes in chemical reactions occurs when atoms _____ to form new substances.
Zanzabum

A chemical reaction is marked by new substance formation. The energy changes in chemical reactions occur when atoms <u>rearrange</u> to form new substances.

<h3>What is a chemical reaction?</h3>

A chemical reaction is said to be the process that is characterized by the formation of new substances by the alteration of the chemical composition and the properties of the compound or the molecule.

The reaction results in a new product by the rearrangement of the atoms of the reactant molecule by breaking and creating chemical bonds. The bonds are altered by the change in energy.

Therefore, <u>rearrangement </u>is the correct blank.

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8 0
1 year ago
A 125-mL sample of an aqueous solution of the protein ovalbumin from chicken egg white contains 1.31 g of the dissolved protein
Stella [2.4K]

The molar mass of the protein is 45095 g/mol.

The mass of a sample of a chemical compound divided by the quantity, or number of moles in the sample, measured in moles, is known as the molar mass of that compound.

The expression of molar mass of protein is

M₂ = (W₂/P) (RT/V)

Given;

W₂ = 1.31g

P = 4.32 torr = 5.75 X 10⁻³ bar

R = 0.083 Lbar/mol/K

T = 25°C = 298.15 K

V = 125 ml = 0.125 L

Putting all the values in the above formula

M₂= (1.31 g/5.75 X 10⁻³ bar) X (0.083 Lbar/mol/K X 2)/0.125 L)

M₂ = 45095 g/mol

Thus, the molar mass of the protein is 45095 g/mol.

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7 0
1 year ago
Help me please.... and Thankyou
stealth61 [152]
The answer is B. because it starts at Conifer Seeds and ends at Northern goshawks.
6 0
3 years ago
Determine the heat of reaction for the process TiO2(s) + 4HCl(g) TiCl4(l) + 2H2(g) + O2(g) using the information given below: Ti
Aleks [24]

Answer : The heat of reaction for the process is, 1374.7 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The main chemical reaction is,

TiO_2(s)+4HCl(g)\rightarrow TiCl_4(l)+2H_2(g)+O_2(g)    \Delta H_{rxn}=?

The intermediate balanced chemical reaction will be,

(1) Ti(s)+O_2(g)\rightarrow TiO_2(s)     \Delta H_1=-939.7kJ

(2) 2HCl(g)\rightarrow H_2(g)+Cl_2(g)    \Delta H_2=-184.6kJ

(3) Ti(s)+2Cl_2(g)\rightarrow TiCl_4(l)    \Delta H_3=-804.2kJ

We reversing reaction 1, 3 and multiplying reaction 2 by 2 and then adding all the equations, we get :

(1) TiO_2(s)\rightarrow Ti(s)+O_2(g)     \Delta H_1=939.7kJ

(2) 4HCl(g)\rightarrow 2H_2(g)+2Cl_2(g)    \Delta H_2=2\times (-184.6kJ)=-369.2kJ

(3) TiCl_4(l)\rightarrow Ti(s)+2Cl_2(g)    \Delta H_3=804.2kJ

The expression for heat of reaction for the process is:

\Delta H_{rxn}=\Delta H_1+\Delta H_2+\Delta H_3

\Delta H_{rxn}=(939.7kJ)+(-369.2kJ)+(804.2kJ)

\Delta H_{rxn}=1374.7kJ

Therefore, the heat of reaction for the process is, 1374.7 kJ

3 0
3 years ago
9. A gas occupies 8.2 L at 48°C and 750. torr. What volume will the gas occupy at STP?
slava [35]

Answer: The volume the gas will occupy at STP is 6.9 L

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas = 750 torr = 0.99 atm  (760torr=1atm)

P_2 = final pressure of gas = 1 atm (at STP)

V_1 = initial volume of gas = 8.2 L

V_2 = final volume of gas = ?

T_1 = initial temperature of gas = 48^oC=273+48=321K

T_2 = final temperature of gas = 273K (at STP)

Now put all the given values in the above equation, we get:

\frac{0.99\times 8.2}{321}=\frac{1\times V_2}{273}

V_2=6.9

Thus volume the gas will occupy at STP is 6.9 L

7 0
3 years ago
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