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3 years ago

Describe what a reactant is

Physics

2 answers:

ohaa [14]3 years ago

4 0

Answer:

the element that takes part in a chemical reactions

there are usually two or more reactants in chemical reactions

except decomposition reactions

Ann [662]3 years ago

4 0

Answer:

Reactant- starting materials in a chemical reaction. Reactants undergo a chemical change in which bonds are broken and then new bonds are formed.

Explanation:

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A football player kicks a ball with an initial velocity of 25 m/s at an angle of 53 degrees above the horizontal. The vertical c

Verdich [7]

Answer:

20 m/s

Explanation:

initial velocity, u= 25m/s

u has two components. one in horizontal and in one vertical.

so,

u sin theta = vertical component.

=> u sin theta = 25× 4/5

= 20 m/s

7 0

3 years ago

What is the force of a punch if it accelerates at 0.2m/s2 and has a mass of 2kg?

OleMash [197]

Answer:

0.4 N

Explanation:

We know ,

F = ma
F = 0.2 * 2 N
F = 0.4N

6 0

3 years ago

An object has a coefficient of static friction of 0.3 and a normal force of 30 N. Find the force of static friction.

gladu [14]

Answer:

Explanation:

static friction=normal force x coefficient of static friction

so static friction =30N x 0.3= 9N

7 0

3 years ago

Read 2 more answers

An ideal monatomic gas initially has a temperature of 300 K and a pressure of 5.79 atm. It is to expand from volume 420 cm3 to v

maxonik [38]

Answer:

a) The final pressure is 1.68 atm.

b) The work done by the gas is 305.3 J.

Explanation:

a) The final pressure of an isothermal expansion is given by:

$T = \frac{PV}{nR}$

$T_{i} = T_{f}$

$\frac{P_{i}V_{i}}{nR} = \frac{P_{f}V_{f}}{nR}$

Where:

$P_{i}$ : is the initial pressure = 5.79 atm

$P_{f}$ : is the final pressure =?

$V_{i}$ : is the initial volume = 420 cm³

$V_{f}$ : is the final volume = 1450 cm³

n: is the number of moles of the gas

R: is the gas constant

$P_{f} = \frac{P_{i}V_{i}}{V_{f}} = \frac{5.79 atm*420 cm^{3}}{1450 cm^{3}} = 1.68 atm$

Hence, the final pressure is 1.68 atm.

b) The work done by the isothermal expansion is:

$W = P_{i}V_{i}ln(\frac{V_{f}}{V_{i}}) = 5.79 atm*\frac{101325 Pa}{1 atm}*420 cm^{3}*\frac{1 m^{3}}{(100 cm)^{3}}ln(\frac{1450 cm^{3}}{420 cm^{3}}) = 305.3 J$

Therefore, the work done by the gas is 305.3 J.

I hope it helps you!

3 0

3 years ago

The force of gas particles against the walls of a container is called ________

Liono4ka [1.6K]

Answer:

the answer is pressure

8 0

3 years ago