The force of attraction that the Earth exerts on all objects is called ____

Identify the type of chemical reaction involved in each action. Group of answer choices Michael uses a car that burns fossil fue

777dan777 [17]

Chemical reactions are the molecular and ionic rearrangement of the reactants to form products. The order of the reactions is combustion, photosynthesis and respiration.

<h3>What are the types of reactions?</h3>

A <u>combustion reaction</u> is a chemical reaction in which the reactant reacts in the presence of oxygen to yield the products and some amount of heat and energy. Burning of the fossil fuels in the presence of atmospheric oxygen is the combustion reaction.

<u>Photosynthesis </u>is a biochemical reaction that occurs in the presence of solar energy that converts carbon dioxide and water to produce sugars and oxygen in plant cells. Tomato plantation is an example of photosynthesis.

<u>Respiration </u>is a process by which the organism utilizes food and oxygen as energy sources required by the body to function and perform activities. Eggs are the source of the energy and are a respiration reaction.

Therefore, the order of the reactions is combustion, photosynthesis and respiration.

Learn more about chemical reactions here:

brainly.com/question/10026513

7 0

2 years ago

What mass of HCl is neutralized by 3.33 g Mg(OH)2?

postnew [5]

First, you write the balanced equation for the reaction

2HCl + Mg(OH)2 ----->MgCl2 + 2H2O

Next, find the number of moles of Magnesium Hydroxide

Number of moles of Mg(OH)2 =

mass / Mr = 3.33 / 24 +2(1+16)
=0.0574 mol

Find the mole ratio between HCl and Mg(OH)2 which is 1:2

Number of moles of HCl = 0.0574 x 2 = 0.1148 mol

Mass of HCl = Mr x no. of moles
=0.1148 x (1+35.5)
=4.19 g

3 0

4 years ago

Which statement best describes how protons were

Sonja [21]

Answer:

d

Explanation:

7 0

3 years ago

A gas occupies 3.8 L at -18° C and 975. torr. What volume would this gas occupy at STP?

Aleks04 [339]

To solve the question we will assume that the gas behaves like an ideal gas, that is to say, that there is no interaction between the molecules. Assuming ideal gas we can apply the following equation:

$PV=nRT$

Where,

P is the pressure of the gas

V is the volume of the gas

n is the number of moles

R is a constant

T is the temperature

Now, we have two states, an initial state, and a final state. The conditions for each state will be.

Initial state (1)

P1=975Torr=1.28atm

V1=3.8L

T1=-18°C=255.15K

Final state(2), STP conditions

P2=1atm

T2=273.15K

V2=?

We will assume that the number of moles remains constant, so the nR term of the first equation will be constant. For each state, we will have:

$\begin{gathered} \frac{P_1V_1}{T_1}=nR \\ \frac{P_2V_2}{T_2}=nR \end{gathered}$

Since nR is the same for both states, we can equate the equations and solve for V2:

$\begin{gathered} \frac{P_{2}V_{2}}{T_{2}}=\frac{P_1V_1}{T_1} \\ V_2=\frac{P_{1}V_{1}}{T_{1}}\times\frac{T_2}{P_2} \end{gathered}$

We replace the known values:

$V_2=\frac{1.28atm\times3.8L}{255.15K}\times\frac{273.15K}{1atm}=5.2L$

At STP conditions the gas would occupy 5.2L. First option

8 0

1 year ago

How many 1-cm cubes would it take to construct a cube that is 4 cm on edge? Express your answer using two significant figures.

Firlakuza [10]

Answer:

It would take 64 1-cm cubes to construct a 4-cm cube.

Explanation:

The volume of a cube is equal to the edge raised to the power of 3.

A 1-cm edge cube has a volume of V₁ = (1 cm)³= 1 cm³

A 4-cm edge cube has a volume of V₄ = (4 cm)³= 64 cm³

The number of small cubes required to fill the same volume than the big cube is:

$\frac{V_{4}}{V_{1}} =\frac{64 cm^{3} }{1cm^{3} } =64$

7 0

4 years ago

The force of attraction that the Earth exerts on all objects is called _____.