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2 years ago

Which of these reactions can be classified as double replacement reactions?

1 answer:

7 0

Zn + 2 HCl = ZnCl₂ + H₂ ( single replacement )

2 NaCl + F₂ = 2 NaF + Cl₂( single replacement )

2 AlBr₃ + 3 K₂SO₄ = 6 KBr + Al₂(SO₄)₃ ( double replacement )

2 K + MgBr₂ = 2 KBr + Mg ( single replacement )

Answer C

hope this helps!

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A modest level of ethanol enters the human circulation naturally from __________, equivalent to a fraction of a drink per day.

andriy [413]

intestinal flora

A modest level of ethanol enters the human circulation naturally from intestinal flora, equivalent to a fraction of a drink per day.

<h3>What is intestinal flora?</h3>

inside the intestines are bacteria and other living things.
They aid in food digestion.
Intestinal flora produces vitamins like biotin and vitamin K. Also known as intestinal microflora, microflora, and gut flora.

<h3>Are intestinal flora good?</h3>

Humans have 100 trillion viable bacteria in their intestines.
The intestinal flora is the collective name for these living bacteria, which account for 30% of the faeces bulk.
The intestinal flora contains both useful and dangerous microbes.
They are evenly distributed and the good bacteria take center stage in healthy persons.

<h3>What purpose does the gut flora serve?</h3>

Intestinal microflora primarily serves two purposes:

(1) metabolic processes that result in the absorption of nutrients and energy; and
(2) host defense against invasion by alien microbes.

The immune system's development and balance depend heavily on intestinal microorganisms.

To learn more about intestinal flora visit:

brainly.com/question/12993029

#SPJ4

6 0

1 year ago

Triangle W Z Y is cut by bisector Z X. The lengths of sides Z W and Z Y are congruent. ZX bisects ∠WZY. If the measure of ∠YXZ i

stepan [7]

Answer:

m = 17

Explanation:

From the question we were given that

Triangle WZY is bisected by ZX; ZW = ZY

∠YXZ = (6m – 12)°

Based on the characteristics of the triangle, we see that triangle WYZ is an isosceles triangle (that is, triangle WXZ is equal to triangle YXZ)

<YXZ = <WXZ = 90°

Using ∠YXZ = (6m – 12)°

We have:

(6m – 12)° = 90°

6m = 90 + 12 ⇒ 6m = 102

m = 102 ÷ 6 = 17

m = 17

We therefore see that m is equal to 17

7 0

2 years ago

Read 2 more answers

After 184.5 years, onky 0.625 grams of an original 20 gram sample of a radioactive isotope is left. Find the half life

kakasveta [241]

Answer:

half-life=T= 36.9 years

Explanation:

As we know that

N ( t ) = N ( 0 ) ⋅ 0.5 ^(t/ T )

N ( 0 ) =the number of atoms you start with=20 gram

and N ( t )= the number of atoms left=0.625 grams

after a certain time=t=184.5 years

T=half life of a nuclide=?

Putting value in above equation we get

half-life=T= 36.9 years

8 0

2 years ago

How do balanced chemical equations show the conservation of mass?

stepladder [879]

You cannot create something from nothing and similarly you cannot create less from more, if you didn't balance an equation that needs to be balanced, your product might end up equalling more or less than the total mass of the two elements combined. Which is impossible

3 0

2 years ago

BEARINGS

noname [10]

Answer:

a. (i) the distance of R from P is 13 Km to the nearest kilometer

(ii) the bearing of R from P = 360 - (38 + 25) = 297° to the nearest degree

b. the distance of m from P is 11 Km to the nearest kilometre

Explanation:

a) A triangle PQR is formed. Q = 90°, p = 8 km; r = 10 km; distance of R from P is q is to be found.

(i) Using the cosine rule: q² = p² + r² - 2prCosQ

q² = 8² + 10² - 2 * 8 * 10 * Cos90

q² = 64 + 100 + 0

q² = 164

q = 13 Km to the nearest kilometre

Therefore, the distance of R from P is 13 Km to the nearest kilometer

(ii) the bearing of R from P

The angle at P is found using the formula Cos P = (q² + r² - p²)/2qr

Cos P = 13² + 10² - 8²/2 * 13 *10

Cos P = 0.7884

P = Cos⁻¹ 0.7884

P = 38°

Therefore, the bearing of R from P = 360 - (38 + 25) = 297° to the nearest degree

Note : 25° is alternate (Northwest) to 65°at P

b) A right-angled triangle QMP is formed

using the trigonometrical ratios; cos Θ = adjacent/hypotenuse

where the hypotenuse side = 10 km, adjacent side = distance of M from P, x

cos P = x/10

x = cos 38 * 10

x = 11 Km to the nearest kilometre

Therefore, the distance of m from P is 11 Km to the nearest kilometre

5 0

2 years ago