In the image above, the girl is using her arm to lift a weight. Her arm is acting as a ______

A bird could be both a consumer and a producer

Ilia_Sergeevich [38]

False, only Consumers.

4 0

3 years ago

Which statement is true of a chemical change? (Plato)

OleMash [197]

Answer:

A

Explanation:

The answer A is the best answer because it contains the most general characteristic of a chemical change.

5 0

3 years ago

Read 2 more answers

What is the mass of the block of iron illustrated below?

Mandarinka [93]

VOLUME= 5cm*10cm*2cm =100cm^3
but density of iron=7.874g/cm^3
mass=7.874g*100 =787.4g
mass of that block = 787.4g

7 0

3 years ago

Read 2 more answers

Two systems with heat capacities 19.9 J mol-1 K-1 and 28.2 ] mol 1 K-1 respectively interact thermally and come to an equilibriu

MAVERICK [17]

Answer : The initial temperature of system 2 is, $19.415^oC$

Explanation :

In this problem we assumed that the total energy of the combined systems remains constant.

$-q_1=q_2$

$m\times c_1\times (T_f-T_1)=-m\times c_2\times (T_f-T_2)$

The mass remains same.

where,

$C_1$ = heat capacity of system 1 = 19.9 J/mole.K

$C_2$ = heat capacity of system 2 = 28.2 J/mole.K

$T_f$ = final temperature of system = $30^oC=273+30=303K$

$T_1$ = initial temperature of system 1 = $45^oC=273+45=318K$

$T_2$ = initial temperature of system 2 = ?

Now put all the given values in the above formula, we get

$-19.9J/mole.K\times (303-318)K=28.2J/mole.K\times (303-T_2)K$

$T_2=292.415K$

$T_2=292.415-273=19.415^oC$

Therefore, the initial temperature of system 2 is, $19.415^oC$

8 0

4 years ago

Considering factors that affect that solubility which statement below true?

vovikov84 [41]

Answer:

Part A. The solubility of gases in water increases with increasing temperature.

Part B. Hexane (C₆H₁₄)

Explanation:

Part A

Considering factors that affect that solubility which statement below true?

With a few exceptions, the solubility of most solid solutes in water decreases as the solution temperature increases. FALSE. With a few exceptions, the solubility of most solid solutes in water increases as the solution temperature increases.
The solubility of gases in water increases with increasing temperature. FALSE. In general, the solubility of gases decreases with increasing temperature.
The solubility of a gas in any solvent is increased as the partial pressure of the gas above the solvent Increases. TRUE. According to Henry's law, the solubility of a gas in a liquid is proportional to its partial pressure.
Substances with similar intermolecular attractive forces tend to be insoluble in one another. FALSE. Substances with similar intermolecular attractive forces tend to be soluble in one another.

Part B

Which of these is the best solvent for nonpolar solutes?

acetone (CH₃COCH₃)

ethanol (CH₃CH₂OH)

hexane (C₆H₁₄)

water

There is a general rule that states "like dissolves like", meaning polar is soluble in polar and nonpolar is soluble in nonpolar. Thus, hexane, which is the least polar solvent, would be the best choice for nonpolar solutes.

3 0

3 years ago

In the image above, the girl is using her arm to lift a weight. Her arm is acting as a _______.