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amm1812
3 years ago
5

Which statement is true about elements?

Chemistry
1 answer:
ipn [44]3 years ago
7 0

I believe the answer is a

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Is lead found in diamonds
mylen [45]
Yes is can be found in diamonds!
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Analyze the reaction to determine whether the
Bumek [7]

Answer: Exothermic

Explanation: Looking at the graph, you see that the reaction started with more energy than it ended with, meaning it gave out its energy over the course of the reaction. This is also confirmed by the reaction equation, which shows the energy (891 kJ) on the right side of the equation.

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five atoms of hydrogen are reactants in a chemical reaction. how many atoms of hydrogen will be found in the products of that re
Mkey [24]

Answer:

5 atoms of hydrogen will be found in the products

Explanation:

5 atoms of hydrogen will be found in the products becuase the law of conservation of mass states that mass is neither created nor destroyed in chemical reactions.

6 0
3 years ago
What happens when a catalyst is added to a chemical reaction that is already in progress?
Elanso [62]

Explanation:

when the catalyst is added the reaction with the lower activation energy occur

3 0
3 years ago
Predict the density of acetylene gas (C2H2) at 0.910 atm and 20oC.
zhuklara [117]

Answer:

d = 0.98 g/L

Explanation:

Given data:

Density of acetylene = ?

Pressure = 0.910 atm

Temperature = 20°C (20+273 = 293 K)

Solution:

Formula:

PM = dRT

R = general gas constant = 0.0821 atm.L/mol.K

M = molecular mass = 26.04 g/mol

0.910 atm × 26.04 g/mol = d × 0.0821 atm.L/mol.K×293 K

23.7  atm.g/mol = d × 24.1 atm.L/mol

d = 23.7  atm.g/mol / 24.1 atm.L/mol

d = 0.98 g/L

6 0
3 years ago
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