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Usimov [2.4K]
4 years ago
5

PLEASE ANSWER!!! ITS MY LAST QUESTION ON MY TEST AND IT IS GONNA GET ME OFF PROBATION

Chemistry
2 answers:
Arisa [49]4 years ago
8 0

Answer:

I chose A and B i also took the test

Explanation:

Sorry its late

kap26 [50]4 years ago
4 0

Answer:

A & B

Explanation:

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Which situation describes evidence of a chemical change?
Oksanka [162]

Answer:

The correct answer is:

A solution feels warm after a cool solid is added to it (C)

Explanation:

Chemical changes among other results in a change of the temperature of the reactants, producing a product of higher temperature (exothermic reaction) or  a product of lower temperature (endothermic reaction). In this case, the temperature of the product was higher than the reactants suggesting an exothermic reaction.

The other options however, suggests  physical changes rather than a chemical changes;

A. the change of color of the water suggest mixing or water and color molecules.

B. solid changing into liquid is change of state, which is more of a physical change than chemical

D. Filtration is a physical process, hence the change is a physical change.

8 0
3 years ago
What is the name of the chemical formula Ti3(PO4)2
Veseljchak [2.6K]
It is Titanium (II) Phosphate.
3 0
3 years ago
At STP, which gas sample has a volume of 11.2 liters?
Natasha2012 [34]

Answer:

0.500 moles of CO2 has a volume of 11.2 L at STP (option B)

Explanation:

Step 1: Data given

Volume of a gas at STP = 11.2 L

STP: Pressure = 1 atm  and temperature = 273 K

Step 2: Calculate volume

p*V= n*R*T

V = (n*R*T)/p

⇒with V = the volume of the gas = TO BE DETERMINED

⇒with n = the number of moles of the gas

⇒with R = the gas constant = 0.08206 L*atm/mol*K

⇒with T = the temperature = 273 K

⇒with p = the pressure of the gas = 1 atm

A ) 0.250 mole of NH3

V = (0.250 * 0.08206 * 273) / 1

V = 5.6 L

B ) 0.500 mole of CO2

V = (0.500 * 0.08206 * 273) / 1

V = 11.2 L

C ) 0.750 mole of NH3

V = (0.750 * 0.08206 * 273) / 1

V = 16.8 L

D) 1.00 mole of CO2

V = (1.00 * 0.08206* 273) / 1

V = 22.4 L

0.500 moles of CO2 has a volume of 11.2 L at STP (option B)

3 0
4 years ago
How many moles of hydrogen atoms are there in 120 g of C6H12O6
lys-0071 [83]

Answer: 8.0 moles

Explanation:

0.6661 moles×12 H≈8.0 moles

5 0
4 years ago
List the five major pollutants in the United States
lawyer [7]
Fine particles, ground level ozone, sulfur dioxide, nitrogen dioxide, lead
6 0
4 years ago
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