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4 years ago

Which detail supports the main idea Bats are useful to humans?

Chemistry

1 answer:

Zolol [24]4 years ago

3 0

Answer:

Bats eat hundreds of mosquitoes and other annoying insects at night.

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How many grams of potassium chloride will be needed to produce 829 grams of zinc chloride?

grandymaker [24]

Answer:

[tex]2KCl + Zn {}^{2 + } → 2K {}^{ + } + ZnCl _{2} \\ molecular \: mass \: of \: zinc \: chloride = 65 + (35.5 \times 2) = 136 \: g \\ molecular \: mass \: of \: potassium \: chloride = 39 + 35.5 = 74.5 \: g

6 0

3 years ago

1. If you have 25% radioactive parent atoms in a mineral crystal, and 75% daughter atoms, how many half-lives have passed?

Andreyy89

Too freaking many... or maybe not many at all

5 0

3 years ago

Suppose that the mixture in problem 4 is at 15 OC, where the pure vapor pressures are 12.5 mmHg for water and 32.1 mmHg for etha

EleoNora [17]

Answer:

Explanation:

Since we are not given the mole fraction of ethanol and water; we will solve this theoretically.

Using Raoult's Law:

$P_A = (P_o)_A*X_A$

For water:

$(P)w = P_o \times \text{mole fraction of water}$

where $P_o$ of water = 12.5 mmHg

Then, the vapor pressure of water:

$(P)w = 12.5 \ mmHg \times \text{mole fraction of water}$

For ethanol:

$P_E = P_o \times \text {mole fraction of ethanol}$

and the $P_o$ of ethanol = 32.1 mmHg

Then, the vapor pressure of ethanol:

$P_E = 32.1 \ mmHg \times \text {mole fraction of ethanol}$

The total vapor pressure $T_P = P_W + P_E$

The total vapor pressure = $(12.5 \ mmHg \times \text{mole fraction of water}) + (32.1 \ mmHg \times \text {mole fraction of ethanol})$

3 0

3 years ago

Classify these salts as acidic, basic, or neutral. kcl, nh4br, k2co3, nacn, liclo4? this is what i put but got it wrong: nh4br =

olchik [2.2K]

I'll just list down the acidic, basic, and neutral salts.

ACIDIC
THE CATION: is the conjugate acid of a weak base
THE ANION: Conjugate Base of A Strong Acid

Ammonium Sulfate - (NH₄)₂SO₄
Ammonium Chloride - NH₄Cl
BASIC
THE CATION: comes from the cation of a strong Base (i.e. Na+, K+, Li+)
The Anion: comes from the conjugate base of a weak acid

Sodium Acetate - CH₃COONaSodium Phosphate - Na₃PO₄
Calcium Acetate - (CH₃COO)₂Ca
NEUTRAL
THE CATION: comes from a strong base
THE ANION: comes from a strong acid

Sodium Nitrate - NaNO₃
Barium Chloride - BaCl₂Potassium Chloride - KCl

5 0

4 years ago

Bonds in which atoms share electrons are defined as _____ bonds.

Kaylis [27]

Ionic, think about the way metals share electrons with other metals, resulting in malleability.

5 0

4 years ago