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BaLLatris [955]

3 years ago

15

Plan an investigation to explore the relationship between properties of substances and the electrical forces within those substa

nces.

1 answer:

kenny6666 [7]3 years ago

8 0

Answer:

la verdad no se no ablo ingles solo espanis

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what is the purpose of the universal indicator? how does it help indicate a chemical reaction? does the indicator give any parti

Finger [1]

The purpose of an universal indicator is to test wether a solution is acid or if its a base. It changes colors according to the PH's. It helps a lot in the indication of a chemical reaction because it can say if <span>each component loses or gains protons depending upon the acidity or basicity of the solution being tested.An universal indicator can say if a determined solution proves to be endothermic or exothermic. If the solution is not tested as acid or base then we cannot knwo if there will be an endothermic reaction or an exhotermic one</span>

3 0

4 years ago

How many particles are there in 1.43 g of a molecular compound with a gram molecular mass of 233g

dalvyx [7]

<span>1.43g x (1 mole / 233g) x (6.022x10^23 particles / mole) = 3.70 x 10^ 21 particles</span>

7 0

3 years ago

A solution containing 42% naoh by mass has a density of 1.30 g/ml. what mass, in kilograms, of naoh is in 6.00 l of this solutio

Aliun [14]

NaOH
Na=23
O=16
H=1
SO,NaOH=23+16+1
NaOH=40g/mol
42% of 40=42/100x40
oxygen is the compound
density=mass/volume
1.30=mass/6
mass=7.8g

3 0

4 years ago

Read 2 more answers

For Lewis acids and bases, the base is defined as an electron pair donor / acceptor (circle the correct answer).

damaskus [11]

Answer: electron donor.

Explanation:

According to Arrhenius concept, a base is defined as a substance which donates hydroxide ions $(OH^-)$ when dissolved in water and an acid is defined as a substance which donates hydronium ions $(H_3O^+)$ in water.

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

$NH_3+H^+\rightarrow NH_4^+$

Here $NH_3$ acts as lewis base and $H^+$ act as lewis acid.

Thus lewis base is defined as an electron pair donor.

8 0

4 years ago

A backpacker collects snow at 0°C, and places it in a cooking pot on a camp stove. It takes 643 kJ of heat energy to melt the sn

frutty [35]

Answer:

mass (m) of the snow that the backpacker collected= 0.855 kg

Explanation:

Given that:

Q = 643 kJ = 643000 J

ΔHfusion = 6.02 kJ/mol = 6020 J/mol

number of mole of water H2O = $\frac{mass (m)}{18}$

c = 4.18 J/g⋅K

ΔT = 100 K

Since there is a phase change from solid to liquid; then :

$Q =$ $Q_s + Q_l$

ΔH = $\frac{q}{mol}$

However without the given mass; we substitute $\frac{m}{18}$ for the number of moles; so:

Q = $\delta H * \frac{m}{18}$ $+ m*c * \delta T$

$643000 =$ $6020 * \frac{m}{18}+ m * 4.18 * 100$

m = 855 g

m = 0.855 kg

mass (m) of the snow that the backpacker collected= 0.855 kg

8 0

3 years ago