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2 years ago

What are three ways in which a metal is different to a non-metal?

2 answers:

7 0

Metals are good conductors of energy and heat while non metals are bad conductors of energy and heat

Metals are malleable and ductile while nonmetals are brittle

Metals are solid at room temp expect Hg which is liquid at room temp and we have non metals that’s are solid liquid and gas such as ( carbon oxygen sulfur bromine iodine )

elena-14-01-66 [18.8K]2 years ago

4 0

Answer:

1)non.metals gain electron but metals lose electron.

2)metals are good conductor of heat and electricity but non.meatals are bad conductor of heat and electricity.

3)most of metals are shiny but non .metals are not.

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If an object has a Mass of 11g and a volume fo 13mil, what is its density?

Nimfa-mama [501]

Answer:

$\boxed {\boxed {\sf B. \ d \approx 0.85 \ g/mL}}$

Explanation:

Density is found by dividing the mass by the volume.

$d=\frac{m}{v}$

The mass of the object is 11 grams and the volume is 13 milliliters.

$m= 11 \ g \\v= 13 \ mL$

Substitute the values into the formula.

$d= \frac{11 \ g}{13 \ mL}$

Divide.

$d=0.846153846 \ g/mL$

Round to the nearest hundredth. The 6 in the thousandth place tells us to round the 4 to a 5.

$d \approx 0.85 \ g/mL$

The density is about 0.85 grams per milliliter.

8 0

2 years ago

The photodissociation of ozone by ultraviolet light in the upper atmosphere is a first-order reaction with a rate constant of 1.

atroni [7]

Answer:

[O₃]= 8.84x10⁻⁷M

Explanation:

The photodissociation of ozone by UV light is given by:

O₃ + hν → O₂ + O (1)

The first-order reaction of the equation (1) is:

$rate = k [O_{3}] = - k \frac{\Delta [O_{3}]}{\Delta t}$ (2)

where k: is the rate constant and Δ[O₃]/Δt: is the variation in the ozone concentration with time, and the negative sign is by the decrease in the reactant concentration

We can get the following expression of the first-order integrated law of the reaction (1), by resolving the equation (2):

$[O_{3}]_{t} = [O_{3}]_{0} \cdot e^{-kt}$ (3)

where [O₃](t): is the ozone concentration in the elapsed time and [O₃]₀: is the initial ozone concentration

We can calculate the initial ozone concentration using equation (3):

$[O_{3}]_{t} = 5.0 \cdot 10^{-3}M \cdot e^{-(1.0\cdot 10^{-5}s^{-1}) (\frac{10d \cdot 24h \cdot 3600 s}{1d \cdot 1h})} = 8.84 \cdot 10^{-7}M$

So, the ozone concentration after 10 days is 8.84x10⁻⁷M.

I hope it helps you!

3 0

3 years ago

A reaction takes place between two gases at 298 K. There are 2.0 moles of gas A and 3.0 moles of gas B. Which scenario would lo

Soloha48 [4]

Choice B I think, because if the temperature decreases the particles move slower due to less kinetic energy, and thus won't collide as frequently.

3 0

2 years ago

Read 2 more answers

What is measured by the heat of reaction?

bixtya [17]

Answer:

The heat of reaction is basically the energy that is being released and or absorbed when chemicals are transformed in a type of chemical reaction. However, the heat of reaction or also called reaction enthalpy is mostly or typically expressed as a molar enthalpy in kJ/mol and or as just a specific enthalpy in kJ/kg or kJ/L.

6 0

2 years ago

Which element would be a good conductor of heat and electricity?

g100num [7]

Answer:

Transitional metals are good conductors of both heat and electricity.

But since there aren't any. It could be Calcium.

7 0

2 years ago

Read 2 more answers