CHEMISTRY HIGH SCHOOL

You are throwing an object with a force of 140 N. The object accelerates 19.0 m/s/s. What is the mass of the object?

Answers

Answer 1
Answer:

Answer:

7.4

Explanation:

F = m × a

F/a = m

m = 140 / 19

m = 7.4

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Why should hypothesis be testable?

Answers

Answer:

D. It must be testable in order to be found true or false.

APEX
When a hypothesis is testable, it means that it's possible to see whether the prediction is true or not. Testing a hypothesis can include conducting experiments, collecting data and making observations.

describe how the current modern atomic theory and model differs from the model jj Thompson proposed ?

Answers

J.J Thompson’s model shows a sphere with electrons that are moving around freely. However, Thompson’s model does not show protons or neutrons. The model that we have today gives a clearer structure showing protons, neutrons, and electrons inside an atom.

Consider this equilibrium:CO2(g) + 2H2O(g) CH4(g) + 2O2(g).

What indicates that the reactants are favored?

Keq is zero.
Keq is very large.
Keq is slightly less than 1.
Keq is slightly greater than 1.

Answers

The equilibrium constant is a value which represents the equilibrium of a reaction. It is a reaction quotient when the reaction reached equilibrium. If Keq is greater than 1, the mixture contains mostly the products. On the other hand, if Keq is less than 1, the mixture contains the reactants. Therefore, the answer is the second option, Keq is very large.

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Answers

first order is the best choice 
 but it really depends on the amount of carbon 

Directions: Write the name of the type of chemical reaction in the space provided.(Can be Synthesis Reaction, Decomposition Reaction, Combustion, Single Displacement Reaction or Double Displacement Reaction)

Answers

The given reactions are combination reaction, decomposition reaction, neutralization reaction, displacement reaction and double displacement reaction.

What is displacement reaction?

A displacement reaction is a chemical process during which a one more reactive element being replaced from its compound by a less reactive element.

What is combination reaction?

When A combination reaction occurs when one or more elements or compounds react together to generate a new chemical. Equations of the following kind are used to depict such reactions.

X+ Y→XY

6) Fe}(s)+3{O}_(2)(g) → 2{Fe}_(2) {O}_(3)(s), this reaction is a kind of combination reaction reaction.

7) {Zn}_(2)(s)+2 {HCl} (aq) → {ZnCl}_(2)(a q)+{H}_(2)(g)

This reaction is a kind of displacement reaction.

8) {MgCO}_(3)(a q)+2 {HCl}(a q)  →{MgCl}_(2)(a q)+{H}_(2) {O}(l)+{CO}_(2)(g).

This reaction is a kind of combustion reaction.

9) {NiCl}_(2)(s) → {Ni}(s)+{Cl}_(2)(g).

This reaction is a kind of decomposition reaction.

10) {C}(s)+6 {H}_(2)(g)+{O}_(2)(g) → 2 C}_(2) {H}_(6) {O}(s).

This reaction is a kind of combination reaction.

11) $\mathrm{C}_(12) \mathrm{H}_(22) \mathrm{O}_(11)(s) \rightarrow 12 \mathrm{C}(s)+11 \mathrm{H}_(2) \mathrm{O}(\mathrm{g})$ .

This reaction is a kind of dissociation reaction.

12) $2 \mathrm{LiI}(a q)+\mathrm{Pb}\left(\mathrm{NO}_(3)\right)_(2)(a q) \rightarrow 2 \mathrm{LiNO}_(3)(a q)+\mathrm{PbI}_(2)(s)$.

This reaction is a kind of double displacement reaction.

13) $\mathrm{CdCO}_(3)(s) \rightarrow \mathrm{CdO}(s)+\mathrm{CO}_(2)(g)$.

This reaction is a kind of decomposition reaction

14) $\mathrm{Cl}_(2)(g)+2 \mathrm{KBr}(a q) \rightarrow 2 \mathrm{KCl}(a q)+\mathrm{Br}_(2)(g)$.

This reaction is a kind of single displacement reaction.

15) $\mathrm{BaCl}_(2)(a q)+2 \mathrm{KIO}_(3)(a q) \rightarrow \mathrm{Ba}\left(\mathrm{IO}_(3)\right)_(2)(s)+2 \mathrm{KCl}(a q)$.

This reaction is kind of double displacement reaction.

16) $2 \mathrm{Mg}(s)+\mathrm{O} 2(\mathrm{~g}) \rightarrow 2 \mathrm{MgO}(s)$.

This reaction is a kind of combination reaction.

17) AgNO_(3) (aq) +KI(aq) →KI(aq) + KNO_(3)(aq).

This reaction is a kind of double displacement reaction.

18) $2 \mathrm{Li}(s)+\mathrm{H}_(2) \mathrm{O}(b) \rightarrow 2 \mathrm{LiOH}(a q)+\mathrm{H}_(2)(g)$.

This reaction is a kind of single displacement reaction.

19) $\mathrm{C}(\mathrm{s})+\mathrm{O}_(2)(\mathrm{~g}) \rightarrow \mathrm{CO}_(2)(\mathrm{~g})$.

This reaction is a kind of combination reaction.

To know more about displacement reaction click here.

brainly.com/question/3172917.

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How many valence electrons are in an atom of phosphorus?a. 2
c. 4
b. 3
d. 5 Please select the best answer from the choices provided A B C D

Answers

How many valence electrons are in an atom of phosphorus?

a. 2
c. 4
b. 3
d. 5 Please select the best answer from the choices provided A B C D

There are five valence electrons are in an atom of phosphorus. The answer is letter D. 
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