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irina [24]
3 years ago
5

Which statement describes streak?

Chemistry
2 answers:
Oliga [24]3 years ago
5 0

Answer:

Streak is tested by scraping a mineral across plate

Explanation: Hope this helps :)

miss Akunina [59]3 years ago
3 0
Stream is tested by scraping a mineral across plate
You might be interested in
Label the states of each compound in the reaction below.
devlian [24]

Answer:

CuSO₄(aq) + 2KOH (aq) —> Cu(OH)₂(s) + K₂SO₄(aq)

Explanation:

CuSO₄ + 2KOH —> Cu(OH)₂ + K₂SO₄

To know the state of each compounds, we shall determine the complete ionic equation. This can be obtained as follow:

In solution, CuSO₄ and KOH will dissociate as follow:

CuSO₄(aq) —> Cu²⁺(aq) + SO₄²¯(aq)

KOH (aq) —> K⁺ (aq) + OH¯(aq)

CuSO₄(aq) + KOH (aq) —>

Cu²⁺(aq) + SO₄²¯(aq) + 2K⁺(aq) + 2OH¯(aq) —> Cu(OH)₂(s) + 2K⁺(aq) + SO₄²¯(aq)

Note: Cu(OH)₂ is insoluble in water.

Therefore, the elemental equation is:

CuSO₄(aq) + 2KOH (aq) —> Cu(OH)₂(s) + K₂SO₄(aq)

8 0
2 years ago
An ice cube melts on the warm sidewalk on a hot summer day. Let the entropies of the ice cube, of the pavement and of the ice cu
Aloiza [94]

Answer:

3. Sice increases, Ssw decreases, Ssys increases

Explanation:

Entropy basically refers to the degree of disorderliness of a system.

Ice Cube --> As the ice cube melts, it undergoes a change in state of matter from solid to liquid hence it's entropy increases as the degree of movement of its molecules is more disordered in the liquid state.

This means the likely options are; 1, 3 and 4.

Sidewalk --> The entropy here decreases as the ice melts on the side walk. This is because there is a reduction in temperature. Entropy is directly proportional to temperature. Decrease in temperature leads to decrease in entropy.

This means the likely option is 1 and 3

The net entropy change of the system is however positive.

3 0
2 years ago
What is the correct name of the compound that is incorrectly named 1-chloro-3-pentyne?
sleet_krkn [62]
No that is why I am asking for help
3 0
3 years ago
Read 2 more answers
Describe your results. How close to the real value was your calculated value?
MatroZZZ [7]

Animals with larger weights compensate for the large force they exert on the ground, by having a large footprint area in order to reduce the pressure of their feet on the ground.

<h3>Why do animals with large weight have large feet?</h3>

Large animals such as elephants, lions, hippopotamus, etc, usually have a large foot print area compared to smaller animals.

This larger footprint area helps to support their weight.

The weight of these animals exerts a force as well as pressure on the ground.

Pressure, force and area are related by the equation below:

  • Pressure = Force/Area

The larger the area, the smaller the pressure.

In order to compensate for the large force they exert on the ground, larger animals possess a large footprint area in order to reduce the pressure of their feet on the ground.

Learn more about force, pressure and area at: brainly.com/question/8033367

6 0
1 year ago
Will mark as Brainliest.
Alex777 [14]
We can use combined gas law,
 PV/T = k (constant)

Where, P is the pressure of the gas, V is volume of the gas and T is the temperature of the gas in Kelvin.
For two situations, we can use that as,
P₁V₁/T₁= P₂V₂/T₂

P₁ = 795 mm Hg
V₁ =  642 mL
T₁ = (273 + 23.5) K = 296.5 K
P₂ = ? 
V₂ = 957 mL
T₂ = (273 + 31.7) K = 304.7 K

From substitution,
795 mm Hg x 642 mL / 296.5 K = P₂ x 957 mL / 304.7 K
                                              P₂ = 548.072 mm Hg                                              

760 mmHg = 1 atm
548.072 mm Hg = 1 atm x (548.072 mmHg / 760 mmHg)
                           = 0.721 atm


Pressure of Oxygen gas is 0.721 atm.


Answer is "A"

Here, we made an assumption that oxygen gas has an ideal gas behavior.
6 0
2 years ago
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