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3 years ago

PLS HALP ASAP points

Chemistry

1 answer:

marishachu [46]3 years ago

5 0

Answer:

50 N ( left)

Explanation:

Given data:

The force on right side = 450 N

The force on left side = 500 N

Net force = ?

Solution:

F (net) = 500 N - 450 N

F (net) = 50 N ( left)

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Which of these processes indicates that smelting copper is a chemical change?

Elan Coil [88]

Answer:

AS ITS CANT BE REVERSED
IT IS PERMANEMT CHANGE
NEW SUBSTANCE FORMED
HEATING OS USED OR CHEMICAL REACTION.

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3 years ago

Read 2 more answers

The solubility of oxygen gas in water at 40 ∘c is 1.0 mmol/l of solution. What is this concentration in units of mole fraction?

juin [17]

The formula for mole fraction is:

$mole fraction of solute = \frac{number of moles of solute}{total number of moles of solution}$ -(1)

The solubility of oxygen gas = 1.0 mmol/L (given)

1.0 mmol/L means 1.0 mmol are present in 1 L.

Converting mmol to mol:

$1.00 mmol\times \frac{1 mol}{1000 mmol} = 0.001 mol$

So, moles of oxygen = 0.001 mol

For moles of water:

1 L of water = 1000 mL of water

Since, the density of water is 1.0 g/mL.

$Density = \frac{mass}{volume}$

$Mass = 1.0 g/ml\times 1000 mL = 1000 g$

So, the mass of water is 1000 g.

Molar mass of water = 18 g/mol.

Number of moles of water = $\frac{1000 g}{18 g/mol} = 55.55 mol$

Substituting the values in formula (1):

$mole fraction = \frac{0.001}{55.55+0.001}$

$mole fraction = 1.8\times 10^{-5}$

Hence, the mole fraction is $1.8\times 10^{-5}$ .

7 0

3 years ago

The gravitational strength at te poles is greater than the gravitational strength at the equator. what will happen to an object

amid [387]

Answer:

Explanation:

The weight will decrease.

Because the value of acceleration due to gravity is decreasing thus the weight of object will also decrease.

4 0

3 years ago

Give the coordination number for each metal ion in the following compounds:

qaws [65]

Answer: a. 6(3x2=6)

B. 4(4x1=4)

C. 6(4(1)+2(1)=4+2=6

D. 4

E. 6(3(2)=6)

F. 4(2(1)+2(1)[2+2=4)

G. 5(5(1)=5)

H. 4(2(1)+2(1)=2+2=4)

Explanation:

Coordination number= no of ligands

= No of ligands X denticity

Denticity is nothing but type of ligands like mono,do and tetradentate ligands.

5 0

3 years ago

If the half-life of 37Rb is 4.7x101 years, how long would it take for 0.5 grams of a 2 gram sample to radioactively decay?

k0ka [10]

<u>Answer:</u> The time required will be 19.18 years

<u>Explanation:</u>

All the radioactive reactions follows first order kinetics.

The equation used to calculate half life for first order kinetics:

$k=\frac{0.693}{t_{1/2}}$

We are given:

$t_{1/2}=4.7\times 10^1yrs$

Putting values in above equation, we get:

$k=\frac{0.693}{4.7\times 10^1yr}=0.015yr^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $0.015yr^{-1}$

t = time taken for decay process = ?

$[A_o]$ = initial amount of the reactant = 2 g

[A] = amount left after decay process = (2 - 0.5) = 1.5 g

Putting values in above equation, we get:

$0.015yr^{-1}=\frac{2.303}{t}\log\frac{2}{1.5}\\\\t=19.18yrs$

Hence, the time required will be 19.18 years

4 0

3 years ago