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Vikentia [17]
3 years ago
9

What is the density (g/mL) of an object that has a mass of 0.03 kg and occupies a volume of 25 mL?

Chemistry
2 answers:
tatyana61 [14]3 years ago
5 0
First convert the kg to g ----- 0.03kg = 30g
Then divide the mass by the volume ----- 30g ÷ 25mL = 1.2
The density is 1.2g/mL<span />
zavuch27 [327]3 years ago
3 0

Answer : The density of an object is 1.2 g/mL

Explanation :

Density : It is defined as the mass contained per unit volume.

Formula used :

Density=\frac{Mass}{Volume}

Given :

Mass of object = 0.03 kg = 30 g

conversion used : (1 kg = 1000 g)

Volume occupied by object = 25 mL

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

Density=\frac{30g}{25mL}=1.2g/mL

Therefore, the density of an object is 1.2 g/mL

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Chemical reactionthe formation of a the formation of a helium and water ​
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Answer:

Hydrogen and oxygen combine to form water by the formula:

2 H2 + O2 → 2 H2O

The formation reaction of this process is:

H2 + ½ O2 → H2O

Explanation:

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6 0
3 years ago
What element has a shorthand configuration of [He]2s^22p^1
nlexa [21]

Boron

You start at He and work you way down

3 0
4 years ago
) In a nuclear reaction, which quantity is the same before and after the change? (1 point)
olganol [36]

Answer:

In alpha decay, shown in Fig. 3-3, the nucleus emits a 4He nucleus, an alpha particle. Alpha decay occurs most often in massive nuclei that have too large a proton to neutron ratio. An alpha particle, with its two protons and two neutrons, is a very stable configuration of particles. Alpha radiation reduces the ratio of protons to neutrons in the parent nucleus, bringing it to a more stable configuration. Many nuclei more massive than lead decay by this method.

Explanation:

8 0
3 years ago
2
Law Incorporation [45]

Answer:

(a) W

(b) X

(c) Y

Explanation:

Let's consider the following table with melting and boiling points for 4 substances.

Substance     Melting Point (°C)       Boiling Point (°C)

     W                       -7                                  60

     X                       660                              2500

     Y                        180                               1330

     Z                         115                                445

Let's consider that:

  • Below the melting point, a substance is solid.
  • Between the melting and the boiling point, a substance is liquid.
  • Above the boiling point, a substance is gas.

(a) Which substance is a gas at 100°C?

At 100 °C, W is above the boiling point

(b) Which substance is a liquid for the largest range of temperature?

The largest difference between the melting point and the boiling point is that of X: 2500 - 660 = 1840.

(c) Which substance is liquid at 1000 °C and a gas at 2000°C?​

Y is between the melting and the boiling point at 1000 °C and above the boiling point at 2000 °C.

3 0
3 years ago
A spring with constant 50 N/m is stretch 0.5 m. How much EPE does it have? A. 25 J B. 12.5 J C. 50 J D. 6.25 J
Step2247 [10]

Answer:

D. 6.25 J

Explanation:

  • EPE = 1/2*k*(Δx)²

∴ k = 50 N/m

∴ Δx = 0.5 m

⇒ EPE = 1/2*50 N/m*(0.5m)²

⇒ EPE = 6.25 N.m = 6.25 J

4 0
3 years ago
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