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3 years ago

If you had a box that you couldn't open, how could you find out what is inside?

Chemistry

2 answers:

MariettaO [177]3 years ago

8 0

Answer:

Shake it, imagine whats in it, or leave it alone.

Anvisha [2.4K]3 years ago

6 0

Answer: use you imagination

Explanation:

if you don’t know and will never know, just guess

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Consider the statement: “The temperature of the land is an important factor for the ripening of oranges, because it affects the

Alexxx [7]

Physical Properties: Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter. so physical changes are the change in temperature of the land and the evaporation of water and change humidity of the air. chemical change is the ripening of the orange

7 0

3 years ago

Give the nuclear symbol for the isotope of gallium, ga, that contains 40 neutrons per atom. Replace the question marks with the

Cerrena [4.2K]

The nuclear symbol of an element have three parts namely:

the symbol of an element
mass number of the element
atomic number of the element

The general representation is as:

$_{Z}^{A}X$

where X is the chemical symbol of the element, A is mass number of the element that is total number of neutrons and protons in the nucleus of an atom, and Z is atomic number of the element that is number of protons in the atom.

Element = Gallium, $Ga$ (given)

Number of neutrons = 40 (given)

Let the nuclear symbol be $_{?}^{?}Ga$ . So, we need to determine the values of "?" in the symbol.

Atomic number of Gallium, $Ga$ = 31

Since, atomic number = Number of protons.

So, number of protons of Gallium, $Ga$ = 31

Mass number = number of protons + number of neutrons

Substituting the values:

Mass number = $31+40 = 71$

So, the nuclear symbol is $_{31}^{71}Ga$ .

7 0

4 years ago

How long can a proton-antiproton pair exist without violating the principle of the conservation of mass?

REY [17]

Anti proton are short lived anti-particles of protons that has a charge of -1. When they encounter their counter part, which is the proton, they exist for a short span of time only since they will be annihilated and burst into a form of energy.

4 0

3 years ago

What is the molarity of a solution that contains 40. grams of NaOH in 0.50 liter of solution

statuscvo [17]

Answer:

The molarity of the solution is: 2 M

Explanation:

We calculate the weight of 1 mol of NaOH:

Weight 1 mol NaOH= Weight Na + Weight 0 + Weight H= 23 g+16g+ 1 g= 40g/mol

The molarity is the quantity of moles in 1000ml (1 liter) of solution:

0,5liter-----40 grams NaOH

1 liter----x=(1 liter x 40 grams NOH)/0,5 liter = 80 grams NaOH

40 grams----1 mol NaOH

80 grams----X=(80 grams x 1 mol NaOH)/40 grams= 2 mol NaOH--> 2M

5 0

3 years ago

It's January in Nashville and your local weather station just informed you that the temperature outside is

quester [9]

3.84 Kg of sodium chloride is needed to lower the freezing point of the water so that ice melts.

Explanation:

Data given:

mass of ice = 30 Kg

molar mass of NaCl = 58.5 grams/mole

ΔT(depression in freezing point) = 15.4 F or - 9.22 degrees

Kf = 1.86 degree C/ mole

Molality = ?

mass of NaCl =?

i = 2 (because NaCl breaks into 2 ions)

ΔT = iKfm equation 1

Depression in freezing point when ice melts, the temperature is 0 degrees so

the depression in temperature = 9.22 degrees

putting the values in the equation:

9.22 = 2 x 1.86 x $\frac{mass}{58.5}$ x $\frac{1}{30}$

mass = 3.84 kg of NaCl will be required to lower the freezing point of the water so that the ice melts.

3 0

4 years ago