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3 years ago

What are the three steps scientists take to evaluate a scientific explanation?

1 answer:

8 0

Step 1. - Scientists first take a look at their empirical evidence and try to explain it.
Step 2. - Scientists test if their explanation or conclusion is logical.
Step 3. - If their explanation is logical, they search for new test that may help them to support their first idea.

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Why is it important to be careful when walking on an icy sidewalk?

Archy [21]

Answer:

The is less friction on an icy surface

Explanation:

This is because when u walk on plain ground there is steady friction on the surface but when u walk on an icy floor these is barely any friction which is why it's hard to walk on.

4 0

2 years ago

Read 2 more answers

The decomposition reaction of A to B is a first-order reaction with a half-life of 2.42×103 seconds: A → 2B If the initial conce

kipiarov [429]

Answer:

$t=23.5min$

Explanation:

Hello,

In this case, since the rate equation turns out as shown below due to the first-order kinetics:

$\frac{dC_A}{dt}=-kC_A$

Its integration results:

$\int\limits^{C_A}_{C_A^0} { \frac{dC_A}{C_A}} \,=-k\int\limits^t_0 {} \, dt\\ln(\frac{C_A}{C_A^0})=-kt$

However, the rate constant is computed by considering the given half-life time as follows:

$k=\frac{ln(2)}{t_{1/2}}=\frac{ln(2)}{2.42x10^3s}=2.86x10^{-4}s^{-1}$

In such a way, the required time in minutes to diminish the concentration by 66.8% of the initial turns out:

$C_A=0.668C_A^0$

$ln(\frac{0.668C_A^0}{C_A^0})=-kt$

$t=\frac{-ln(0.668)}{2.86x10^{-4}s^1}=1408.3s*\frac{1min}{60s} \\t=23.5min$

Best regards.

3 0

3 years ago

I need help with number 2

Mademuasel [1]

Answer:

The water in the leaf will evaporate

Explanation:

the leaf would absorb the water and when sat in the sun, the water would evaporate and the leaf would dry out

6 0

3 years ago

Read 2 more answers

Commercial products commonly report concentration in terms of "percentage." Using this

Stella [2.4K]

The answer to the question is 0.8055 as the answer should not include units in it.

Molarity (M) = n/v

n = moles of solute

v = liters of solution

According to question

1% solution → 1 gram of solute for 100 milliliters of solution

2% solution → 2 grams of solute for 100 milliliters of solution

6% NaClO solution → 6 grams of NaClO (solute) for 100 milliliters of solution

Molar mass of NaClO = (22.98 + 35.5 + 16)g/mol = 74.48 g/mol

Atomic mass of Na = 22.98 g/mol

Atomic mass of Cl = 35.5 g/mol

Atomic mass of O = 16 g/mol

1 mol NaClO = 74.48 grams NaClO

74.48 grams NaClO = 1 mol NaClO

6 grams NaClO = (1×6) / 74.48 mole = 0.08055 mole

As unit molarity is mole / liter

So 100 milliliters = 0.1 liters

1 liter = 1000 milliliters

100 milliliters = 100/1000 liters = 0.1 liters

Molarity of NaClO = moles of solute (NaClO) / liters of solution or volume of solution

Molarity of NaClO = 0.08055 / 0.1 mole/L = 0.8055 mole/L

As in question it is mentioned that 'Do not type units into your answer'

So, Molarity of NaClO in clorox bleach = 0.8055

Thus we find out the value of molarity of NaClO in Clorox bleach which came out to be 0.8055 as we dont have to give the answer with units.

Learn more about Molarity here:

brainly.com/question/27208890

#SPJ10

8 0

2 years ago

What will be the volume of a balloon at 98.0 kPa if its volume is 9.65L at 235 kPa?

givi [52]

Answer:

23.14 L

Explanation:

P1(V1)=P2(V2)

98kPa(v1)=(235kPa)(9.65L)

V1=23.14 L

5 0

3 years ago