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stiks02 [169]
4 years ago
5

Please help!!

Chemistry
2 answers:
Phantasy [73]4 years ago
7 0
1.
cost in cents

cost = 5m



2.
miles = c + 2
Nesterboy [21]4 years ago
6 0

Answer:

1) c = 5cents/min × m

2) x = (2+c) miles

Explanation:

1) Cost paid per minute = 5 cents

Or we can also write it as cost per minute = 5 cents/min

Suppose Tom uses phone for m minutes, then cost (c)will be given an expression :

c = 5cents/min × m

2) Distance covered by Clint in a week = c  miles

Distance covered by Brenda =  x

Brenda runs 2 miles more each week than Clint.

x = (2+c) miles

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Kisachek [45]

4,410 kJ

Explanation:

Gravitational Potential Enegry (GPE) is calculated as;

GPE = <em>m*g*h</em>                           where;

m = mass (kg)

g = gravity (m/s²)

h = height (meters)

= 90 * 9.8 * 5000

= 4,410,000‬ joules

= 4,410 kJ

4 0
3 years ago
A solution is prepared by adding 100 mL of 1.0 M HC2H3O2 (aq) to 100 mL of 1.0 M NaC2H3O2 (aq). The solution is stirred and its
DIA [1.3K]

Answer:

(C) H3O+(aq) + C2H3O2−(aq) -> HC2H3O2(aq) + H2O(l)

Explanation:

A buffer is a solution of a weak acid and its salt. It mitigates against changes in acidity or alkalinity of a system. A buffer maintains the pH at a constant value by switching the equilibrium concentration of the conjugate acid or conjugate base respectively.

Addition if an acid shifts the equilibrium position towards the conjugate acid side while addition of a base shifts the equilibrium position towards the conjugate base side.

5 0
3 years ago
SHOW YOUR WORK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
WARRIOR [948]

Answer:

1.375%

Explanation:

Percent Error = measured value - accepted value/ accepted value x 100

Measured Value: 15.78

Accepted Value: 16.00

Work:

\frac{15.78-16.00}{16.00} * 100

\frac{-.22}{16} * 100 = -1.375

You cannot have a negative percentage. Therefore the answer is 1.375%

4 0
3 years ago
Which of the following equations can be used to determine the change in enthalpy of a system? A. `DeltaH_"reaction"=DeltaH_"prod
Nostrana [21]

<u>Answer:</u> The correct answer is Option D.

<u>Explanation:</u>

Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as \Delta H^o

The equation used to calculate enthalpy change is of a reaction is:  

\Delta H^o_{rxn}=\sum [n\times \Delta H^o_f_{(product)}]-\sum [n\times \Delta H^o_f_{(reactant)}]

Hence, the correct answer is Option D.

6 0
3 years ago
On a hot summer day, air rises most quickly when it is above a
NNADVOKAT [17]

Answer:

air rises most quikly above water so i'm confuse it's lake or river

6 0
3 years ago
Read 2 more answers
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