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Svet_ta [14]
4 years ago
8

When a scientific investigation runs for several years, which is most likely true?

Chemistry
2 answers:
Bingel [31]4 years ago
4 0

Answer:

1. Many different hypotheses will be tested.

Explanation:

Scientists test every hypothesis they make for their investigation, before moving onto bigger conclusions.

postnew [5]4 years ago
4 0
It’s 2 i think it’s probably but im sure it’s 2
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A) Atom is generally charge less,<br>why? ​
Aliun [14]

Answer:

Explanation:

Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.

7 0
3 years ago
Enzymes use several types of catalytic mechanisms. Differentiate between acid-base catalysis
belka [17]

Answer:

Explanation:

Covalent catalysis is when a transient covalent bond is formed between substrate and residues such that so the enzyme nucleophilic group on an electrophilic moiety of the substrate is bound at the active site. Metal ion catalysis involves activating bound water through forming nucleophilic hydroxide ion.

6 0
4 years ago
The molar mass of carbon dioxide is 44.0 g/mol. How many moles of CO2 are present in a 58.4 gram sample of CO2
inessss [21]

Answer:

1.33 moles CO2

Explanation:

The number you are converting is 58.4 g CO2, so you start with this value. The conversion factor is 44.0 g/mol CO2. In order to cross out the grams, the grams must go on the bottom of the conversion factor.

                                  1   mol CO2      
58.4 g CO2   x   --------------------------    =    1.33 moles CO2
                              44.0   grams

The answer has three sig figs.

3 0
2 years ago
Calculate the number of atoms in a 1.94 x 10^3 g sample of calcium
34kurt
n =  \frac{m}{M}

n =  \frac{1.94*10^3}{40.08}

n = 48.40 mol

Then,

N = n*Na
N = 48.40*6.02*10^{23}
N= 2.94*10^{25} atoms

Hope this helps !

Photon
3 0
3 years ago
Read 2 more answers
How much heat is required to change 100 g of ice (H2O) at 253 K to vapor (steam) at 393 K?
soldier1979 [14.2K]

<u>Answer:</u> The heat required will be 58.604 kJ.

<u>Explanation: </u>

To calculate the amount of heat required, we use the formula:

Q= m\times c\times \Delta T

Q= heat gained  or absorbed = ? J

m = mass of the substance = 100 g

c = heat capacity of water = 4.186 J/g ° C

Putting values in above equation, we get:

\Delta T={\text{Change in temperature}}=(393-253)K=140K=140^oC

Q=100g\times 4.186J/g^oC\times 140^oC

Q = 58604 Joules  = 58.604 kJ     (Conversion factor: 1 kJ = 1000J)

Thus, heat released by 100 grams of ice is 58.604kJ.

3 0
4 years ago
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