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rodikova [14]
2 years ago
12

Which two smaller groups is the animals kingdom is divided into

Chemistry
1 answer:
Likurg_2 [28]2 years ago
8 0
C pretty sure it’s C because it’s C
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X square+4x+4 factories that ​
Maslowich
Answer:
(x + 2)(x + 2)

Explanation:
You need 2 numbers that times to give 4 and add to give 4. So 2 and 2.
4 0
2 years ago
Write the balanced chemical equation for the following: The destruction of a marble statuary by acid rain: aqueous nitric acid r
Mashcka [7]

Answer: The coefficient in front of nitric acid is 2

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas. Liquids are represented by (l) and gases are represented by (g).

The balanced chemical reaction is :

CaCO_3(s)+2HNO_3(aq)\rightarrow Ca(NO_3)_2(aq)+CO_2(g)+H_2O(l)

7 0
2 years ago
We can drink water straight from the ocean without purifying it. <br><br><br><br> True<br><br> False
xenn [34]

False. The water would be toxic without purifying it before drinking.

7 0
2 years ago
Read 2 more answers
A chemical reaction produced 10.1 cm3 of nitrogen gas at 23 °C and 746 mmHg. What is the volume of this gas if the temperature a
adell [148]

Answer:

volume of gas = 9.1436cm³

Explanation:

We will only temperature from °C to K since the conversion is done by the addition of 273 to the Celsius value.

Its not necessary to convert pressure and volume as their conversions are done by multiplication and upon division using the combined gas equation, the factors used in their conversions will cancel out.

V1 =10.1cm³ , P1 =746mmHg,     T1=23°C =23+273=296k

V2 =? ,   P2 =760mmmHg ,     T2=0°C = 0+273 =273K

Using the combined gas equation to calculate for V2;

\frac{V1P1}{T1}=\frac{V2P2}{T2} \\ re-arranging, \\V2 =\frac{V1P1T2}{P2T1}

V2 =\frac{10.1*746*273}{760*296}

V2=9.1436cm³

6 0
3 years ago
QUESTION 1
Svetlanka [38]

Answer:

C

Explanation:

Because nothing is left at the end of the reaction.

3 0
2 years ago
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