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evablogger [386]

4 years ago

12

Alice has friends coming over for lunch. She has decided to fix grilled cheese sandwiches for them. Each sandwich consists of on

e piece of cheese and two slices of bread. Draw and label an equation that represents these relationships

1 answer:

Alex73 [517]4 years ago

7 0

Answer:

2 slices of bread + 1 slice of cheese → 1 grilled cheese sandwich

Explanation:

i think im not sure

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Why does the atmosphere allow life on planet Earth

Marina86 [1]

Answer:

contains oxgen , hydrogen and water vapour

Explanation:

oxygen+hydrogen=water =to life

5 0

3 years ago

The masses of four objects are given in this table. If all of the objects have the same acceleration, which will require the gre

worty [1.4K]

Answer:

Object 4 in the example

Explanation:

For simplicity and a clearer view of this problem, let's assume that four masses from 1 to 4 have the the masses 2 kg, 4 kg, 6 kg, 8 kg respectively.

According to the second Newton's law, we know that force is directly proportional to both mass and acceleration. The equation representing this is $F = ma$ .

Notice that all of them have the same acceleration. This means, the greater the mass, the greater the force for a fixed acceleration. Simply speaking, the forces for each of the objects would be 2a, 4a, 6a and 8a respectively.

Since we're interested in the magnitude of the force and not direction, we neglect whether acceleration is positive or negative. This means that object 4 will require the greatest force to move, as it has the greatest mass.

3 0

3 years ago

Calculate the molarity of a 10.0% (by mass) aqueous solution of hydrochloric acid.

olga2289 [7]

The question is incomplete,the complete question :

Calculate the molality of a 10.0% (by mass) aqueous solution of hydrochloric acid:

a) 0.274 m

b) 2.74 m

c) 3.05 m

d) 4.33 m

e) the density of the solution is needed to solve the problem

Answer:

The molality of a 10.0% (by mass) aqueous solution of hydrochloric acid is 3.05 mol/kg.

Explanation:

10.0% (by mass) aqueous solution of hydrochloric acid.

10 grams of HCl is present in 100 g of solution.

Mass of HCl = 10 g

Mass of solution = 100 g

Mass of solution = Mass of solute + Mass of water

Mass of water = 100 g - 10 g = 90 g

Moles of HCl = $\frac{10 g}{36.5 g/mol}=0.2740 mol$

Mass of water in kilograms = 0.090 kg

Molality = $\frac{0.2740 mol}{0.090 kg}=3.05 mol/kg$

The molality of a 10.0% (by mass) aqueous solution of hydrochloric acid is 3.05 mol/kg.

6 0

3 years ago

A certain chemical reaction releases of heat for each gram of reactant consumed. How can you calculate what mass of reactant wil

WARRIOR [948]

Answer:

Specific heat capacity formula

Explanation:

The heat capacity gives the exact heat energy at which a given mass of a substance is heated from one temperature to another.

This formula can help determine how much heat is gained or lost during the reaction and is given by:

Q = mcΔT

where:

Q = heat energy in Joules or Calories

m - mass of the substance (g)

c = Specific heat capacity (J/kg°C)

ΔT = change in temperature = (final temp - initial temp) (°C)

I hope this was helpful.

3 0

3 years ago

A 1.200 liter solution contains 35.0 grams of potassium iodide (KI). What is the molarity of this

enot [183]

Answer:

M = 0.177

Explanation:

First, we have to find the molar mass of potassium iodine (KI).

K = 39.098

I = 126.904

Now, add these values together to get the molar mass of KI

39.098 + 126.904 = 166.0028

Now, it's time to do a grams to moles conversion.

35.0 g KI * $\frac{1 mol KI}{166.0028 g KI}$ = $\frac{35.0}{166.0028}$ = 0.212 mol KI

Now, we can find the molarity of this solution.

Molarity (M) = $\frac{mol}{L}$

M = $\frac{0.212 mol KI}{1.200 L}$ = 0.177 M

The molarity (M) of this solution is 0.177.

3 0

3 years ago