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2 years ago

A scientific model must make a testable prediction. a scientific model must make a testable prediction.

1 answer:

8 0

It is true because Scientists will create models (simplified views of reality) to help them focus on the basic fundamental processes.

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you see a structural formula and which the symbols for elements are connected by a long Dash you can assume that the chemical bo

sergejj [24]

When you see a long dash joining two elements in the structural formula of a chemical molecule you can assume that the chemical bonds in the compound are simple bonds.

In the representation of chemical molecules long dashes are used to represent simple bonds since these bonds are longer than double and triple bonds, which are represented by = and ≡ respectively.

8 0

3 years ago

Read 2 more answers

Which fossil fuel is mainly used for heating and cooking?

Anna [14]

I would say C. petroleum

A is wrong

B is impractical for "mainly used"

D thats too expensive

4 0

2 years ago

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The reaction between SO2 and O2 to give SO3 was studied to determine the rate law for the reaction. The following results were o

Tom [10]

Answer : (b) The rate law expression for the reaction is:

$\text{Rate}=k[SO_2]^2[O_2]$

Explanation :

Rate law : It is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

The general reaction is:

$A+B\rightarrow C+D$

The general rate law expression for the reaction is:

$\text{Rate}=k[A]^a[B]^b$

where,

a = order with respect to A

b = order with respect to B

R = rate law

k = rate constant

$[A]$ and $[B]$ = concentration of A and B reactant

Now we have to determine the rate law for the given reaction.

The balanced equations will be:

$2SO_2+O_2\rightarrow 2SO_3$

In this reaction, $SO_2$ and $O_2$ are the reactants.

The rate law expression for the reaction is:

$\text{Rate}=k[SO_2]^2[O_2]^1$

or,

$\text{Rate}=k[SO_2]^2[O_2]$

8 0

3 years ago

Ammonia is the most common and well-known weak base. A sample of household ammonia has a pH of 11.8. Determine its concentration

Galina-37 [17]

The given question is incomplete. The complete question is:

A sample of household ammonia has a pH of 11.50. What is the hydronium ion concentration of this solution?

Answer: The hydronium ion concentration of the solution is $1.58\times 10^{-12}M$

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration. Acids have pH ranging from 1 to 6.9 and bases have pH ranging from 7.1 to 14.

$NH_3+H_2O\rightarrow NH_4^++OH^-$

$pH=-\log [H^+]$

$11.8=-log [H^+]$

$[H^+]=antilog(-11.8)$

$[H^+]=1.58\times 10^{-12}M$

Thus hydronium ion concentration of this solution is $1.58\times 10^{-12}M$

7 0

2 years ago

Read 2 more answers

Drought is a weather condition. true or false

ANTONII [103]

Answer:

true

Explanation:

drought is a period of unusually persistent dry weather that persists long enough to cause serious problems such as crop damage and/or water supply shortages. The severity of the drought depends upon the degree of moisture deficiency, the duration, and the size of the affected area.

7 0

2 years ago