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4 years ago

Rock and sand are non-living.all organisms are ____

Chemistry

2 answers:

Sladkaya [172]4 years ago

7 0

Rock and sand are non-living. All organisms are living.

monitta4 years ago

6 0

Rocks and Sand are non living, all organisms are living and they are all a system working together to create a whole that is greater than themselves.

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An object has a mass of 5 kg. What force is needed to accelerate it at 6 m/s2? (Formula: F=ma) 0.83 N 1.2 N 11 N 30 N

masya89 [10]

Answer: Option (D) 30N

Detailed Solution:
According to Newton's second law:

F = ma --- (A)

Given:
mass = 5kg
acceleration = 6 m/s^2
F = ?

Plug all the value in equation (A)
F = (5)(6)
Ans: F = 30N

4 0

4 years ago

Read 2 more answers

Why must the retina be smooth in a living eye

pishuonlain [190]

The cornea does not contain any blood vessels, but instead contains many nerve endings that make it extremely sensitive. That is why a scratch or a loose eyelash is so painful.

6 0

3 years ago

What is the percentage composition for H2O in this compound Al(OH)3.2H2O?

Gelneren [198K]

Answer:

32.73%

Explanation:

To solve this problem, first find the molar mass of Al(OH)₃.2H₂O

Atomic mass of Al = 27g/mol

O = 16g/mol

H = 1g/mol

Molar mass = 27 + 3(16 + 1) + 2(2(1) + 16)

= 27 + 51 + 36

= 114g/mol

Percentage composition = $\frac{36}{114}$ x 100 = 32.73%

6 0

3 years ago

25.0g of iron is heated to 100.0 and then placed in 50.0 g of water in a insulated calorimeter. the initial temperature of the w

Vinvika [58]

Answer:

Approximately $41.2\; {\rm ^{\circ} C}$ .

Explanation:

Let $t\; {\rm ^{\circ} C}$ be the final temperature of the water and the iron.

Temperature of the water would be increase by $(t - 38.00)\; {\rm ^{\circ} C}$ .

Temperature of the iron would be reduced by $(100.0 - t)\; {\rm ^{\circ} C}$ .

Let $c$ denote the specific heat of each material. Let $m$ denote the mass of the material. For a temperature change of $\Delta t$ , the energy change involved would be:

$Q = c\, m \, \Delta t$ .

The energy that the water need to absorb would be:

$\begin{aligned}& Q(\text{water, absorbed}) \\ =\; & c(\text{water}) \, m(\text{water})\, \Delta t (\text{water}) \\ =\; & 4.181\; {\rm J \cdot g^{-1} \cdot K^{-1}} \times 50\; {\rm g} \times (t - 38.00)\; {\rm ^{\circ} C} \\ =\; & (209.05\, t - 7943.9)\; {\rm J} \end{aligned}$ .

The energy that the iron would need to release would be:

$\begin{aligned}& Q(\text{iron, released}) \\ =\; & c(\text{iron}) \, m(\text{iron})\, \Delta t (\text{iron}) \\ =\; & 0.45\; {\rm J \cdot g^{-1} \cdot K^{-1}} \times 25.0\; {\rm g} \times (100.0 - t)\; {\rm ^{\circ} C} \\ =\; & (1125 - 11.25 \, t)\; {\rm J} \end{aligned}$ .

Since this calorimeter is insulated, the energy that the iron had released would be equal to the energy that the water had absorbed:

$Q(\text{water, absorbed}) = Q(\text{iron, released})$ .

$209.05\, t - 7943.9 = 1125 - 11.25\, t$ .

$t \approx 41.2$ .

Thus, the final temperature of the water and the iron would be approximately $41.2\; {\rm ^{\circ} C}$ .

5 0

3 years ago

The density of Mg is 1.74g/cm3. The density of strontium is 2.60g/cm3. What would you expect the density of Ca to be?

kupik [55]

In between the two values

Explanation:

Since Calcium is in the same periodic group as both Magnesium and Strontium, the density of calcium will be in between the two values. Calcium, Magnesium and Strontium are all alkali earth metals with two outer electrons.

Calcium is the third element in the group that consists of: Be, Mg, Ca, Sr, Ba and Ra.

Density is the amount of matter contained in a unit volume of substance.
Density is directly related to the amount of matter which is the mass of a substance.
Down a periodic group, the atomic mass increases progressively. The mass of an atom is dictated by the number of protons and neutrons in its nucleus.
This implies that the density of atoms will increases down a periodic group
Therefore, it is appropriate to fix the density of calcium between the given values for the two atoms.

Learn more:

density: brainly.com/question/10491444

atomic mass: brainly.com/question/1915462

#learnwithBrainly

6 0

3 years ago