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Softa [21]
3 years ago
5

Which of the following is TRUE about a physical change to a substance?

Chemistry
1 answer:
sesenic [268]3 years ago
4 0

Answer:

D.

The substance will have the same chemical properties.

Explanation:

Physical changes do not alter the chemical composition of a substance, so the chemical properties will not change.

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Give two examples in which the host is harmed.
dexar [7]

Answer:

lice, mosquito

Explanation:

both are examples of parasitism

edit: wait nvm i thought this was bio

7 0
4 years ago
Nitrogen dioxide reacts with carbon monoxide to produce nitrogen monoxide and carbon dioxide. NO2(g) + CO(g) ⟶ NO(g) + CO2(g) A
Naya [18.7K]

<u>Answer:</u> The rate law for the reaction is \text{Rate}=k[NO_3][CO]

<u>Explanation:</u>

Rate law 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.

In a mechanism of the reaction, the slow step in the mechanism determines the rate of the reaction.

For the given chemical reaction:

NO_2(g)+CO(g)\rightarrow NO(g)+CO_2(g)

The intermediate reaction of the mechanism follows:

Step 1:  2NO_2(g)\rightleftharpoons NO_3(g)+NO(g);\text{ (fast)}

Step 2:  NO_3(g)+CO(g)\rightarrow NO_2(g)+CO_2(g);\text{(slow)}

As, step 2 is the slow step. It is the rate determining step

Rate law for the reaction follows:

\text{Rate}=k[NO_3][CO]

Hence, the rate law for the reaction is written above.

5 0
4 years ago
1. Ethene, C2H4, burns in oxygen according to the equation. In an experiment, 10cm3 of ethene was burnt in 50cm3 of oxygen.
lukranit [14]

Answer:

3333333333333337ysh

6 0
3 years ago
Which of the following naming rules would apply to CaCO3?
Alja [10]
Metal (Ca) Polyatomic anion (CO3). You do not need to use the roman numeral because Ca is in group 1. The answer is metal + polyatomic or Calcium Carbonate
3 0
3 years ago
Read 2 more answers
Consider the unbalanced chemical equation hf + al -&gt; alf3 + h2. when coefficients are added to balance the equation, which tw
Mama L [17]

Answer:

a

Explanation:

because you need to add 2 to to hf to make it equal to h2

5 0
3 years ago
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