All categories

4 years ago

50 POINTS!!!!!!!!!!!

Chemistry

2 answers:

Pani-rosa [81]4 years ago

6 0

Answer:

Explanation:

kifflom [539]4 years ago

5 0

A substitution is a mutation that exchanges one base for another. This can include a change in a single chemical letter. ex. changing a to g or in your case g to a. I believe the correct answer should be B.

You might be interested in

Heart attacks can cause sudden death. True False

rjkz [21]

Answer:

True

Explanation:

8 0

3 years ago

Describe the stages of water cycle

lora16 [44]

Evaporation, Condensation, precipitation and collection would be stages

6 0

3 years ago

Read 2 more answers

A sample of hydrogen gas collected by displacement of water occupied 30mL at 24 C on a day when the barometric pressure was 736t

shusha [124]

Answer:

$v_2=6,48*10^{-4}L$

Explanation:

From the question we are told that:

Volume of hydrogen $V_1=30mL=>30*10^{-3}$

Temperature $T_1=24C=>24+273=>297k$

Pressure of water $P_1=22.4torr=>\frac{22.4}{760}=0.0295atm$

Let

STP(Standard Temperature and pressure)

$T_2=273K$

$P_2=1atm$

Generally the equation for ideal gas is mathematically given by

$\frac{p_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

Therefore

$v_2=\frac{P_1v_1T_2}{T_1P_2}$

$v_2=\frac{0.0295*30*10^{-3}*273}{297*1}$

$v_2=6.48*10^{-4}L$ (at STP(Standard Temperature and pressure))

6 0

3 years ago

When magnesium-28 undergoes beta decay, what is the identity and mass number of the nucleus formed?

Ugo [173]

Beta decay increases the atomic number by 1, and does not change the mass number. 28Mg12 → 0e-1 + 28Al13

3 0

3 years ago

Read 2 more answers

Calculate the solubility of CaF2 in g/L (Ksp = 4.0 x 10-8). 2. What is the pH of a solution containing a hydrogen ion concentrat

Pepsi [2]

Answer:

$\large \boxed{1. \text{ 0.17 g/L; 2. 3.52; 3. Cl; 4. (a) +3; (b) +4; (c) +6}}$

Explanation:

1. Solubility of CaF_2

(a) Molar solubility

CaF₂ ⇌ Ca²⁺ + 2F⁻

$K_{\text{sp }} = \text{[Ca$^{2+}$]}\text{[F$^{-}$]}^{2}= 4.0 \times 10^{-8}\\s(2s)^{2}=4.0 \times 10^{-8}\\4s^{3} = 4.0 \times 10^{-8}\\s^{3} = 1.0 \times 10^{-8}\\s =2.2 \times 10^{-3}\text{ mol/L}$

(b) Mass solubility

$\text{Solubility} = 2.2 \times 10^{-3} \text{ mol/L} \times \dfrac{\text{78.07 g}}{\text{1 L }} = \text{0.17 g/L}\\\\\text{The solubility of CaF$_{2}$ is $\large \boxed{\textbf{0.17 g/L}}$}$

2. pH

pH = -log [H⁺] = -log(3.0 × 10⁻⁴) = 3.52

3. Oxidizing and reducing agents

Zn + Cl₂ ⟶ ZnCl₂

$\rm \stackrel{\hbox{0}}{\hbox{Zn}} + \stackrel{\hbox{0}}{\hbox{ Cl}_{2} }\longrightarrow \stackrel{\hbox{+2}}{\hbox{Zn}}\stackrel{\hbox{-1}}{\hbox{Cl}_{2}}$