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ycow [4]
3 years ago
14

HELP I HAVE 14 MINUTES!!

Chemistry
2 answers:
Whitepunk [10]3 years ago
7 0
3- b, d, and g. a neutron has no charge and has mass.
ki77a [65]3 years ago
4 0

Answer:

2 one

Explanation:

is right coz I think

You might be interested in
Bromination of (Z)?3?hexene yields racemic 3,4?dibromohexane. Provide a detailed mechanism for formation of the (3S,4S)?enantiom
alukav5142 [94]

Br Br2 Br Br (3S,4S,)-dibromohexane (3R,4R.)-dibromohexane

3 0
3 years ago
Which of the following aqueous solutions are good buffer systems? . 0.32 M calcium chloride + 0.27 M sodium chloride 0.35 M ammo
irga5000 [103]

Answer:

0.12 M hydrofluoric acid + 0.17 M potassium fluoride

Explanation:

To make a buffer, you must to have an aqueous mixture of a weak acid and its conjugate base or vice versa.

Knowing that:

0.32 M calcium chloride + 0.27 M sodium chloride: <em>is not a good buffer system </em>because CaCl₂ and NaCl are both salts.

0.35 M ammonia + 0.36 M calcium hydroxide <em>is not a good buffer system </em>because ammonia is a weak base but calcium hydroxide is a strong base

0.19 M barium hydroxide + 0.28 M barium chloride <em>is not a good buffer system </em>because Ba(OH)₂ is a strong base.

0.12 M hydrofluoric acid + 0.17 M potassium fluoride <em>is a good buffer system </em>because HF is a weak acid and KF (F⁻ in aqueous medium), is its conjugate base

0.20 M hydrobromic acid + 0.22 M sodium bromide <em>is not a good buffer system </em>because HBr is a strong acid.

7 0
3 years ago
PLEASE HELP ME ASAP: Some students are using samples of different substances for a lab investigation. They plan to observe the p
marin [14]

Answer: S,Fe,O2,Sr, and Al

Explanation: I saw it on quizlet

3 0
3 years ago
How much heat will be absorbed by 395g of water when it's temperature is raised by 55°C​
Firdavs [7]

Answer:

\boxed{\text{91 kJ}}

Explanation:

The formula for the heat released is

q = mCΔT

Data:

 m = 395 g

 C = 4.184 J·°C⁻¹g⁻¹

ΔT = 55 °C

Calculations:

q = 395 × 4.184 × 55 = 91 000 J = 91 kJ

The water will absorb \boxed{\textbf{91 kJ}} of energy.

3 0
3 years ago
The mass of a block is 12 grams and the volume is 6 ml. Calculate the density of the
KengaRu [80]

Answer:

The density of block is 2 g/mL.

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

mass of block = 12 g

volume =  6 mL

density = ?

Now we will put the values in the formula,

d= m/v

d = 12 g/ 6 mL

d = 2 g/mL

so, the density of block is 2 g/mL .

3 0
3 years ago
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