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Fiesta28 [93]
3 years ago
10

First to help me with these 4 gets brainless HURRYTTT UPPPPP

Chemistry
2 answers:
Bezzdna [24]3 years ago
6 0

Answer: It's A

Explanation:

kompoz [17]3 years ago
3 0

Answer:

A

Explanation:

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What is physical weathering NOT caused by? (pls i really need help with this!!)
Anarel [89]

Answer:

the changing tempure in rocks causing it to back apart

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3 years ago
On a coordinate plane, which single transformation could map point A (3,-4) onto point A' (1.5,-2)? *
Ksenya-84 [330]

Answer: A dilation with rule: (x,y)\to(\dfrac12x,\dfrac12y)

Explanation:

A dilation is a non-rigid transformation that creates an image that is the same shape as the original but has a different size.

It uses a scale factor k such that

(x,y)\to(kx,ky)

(x,y)= coordinates of original figure

(kx,ky) = corresponding coordinate in the image.

To transform: A (3,-4) onto point A' (1.5,-2).

Using scale factor k= \dfrac12, we have

A(3,-4)\to A'(\dfrac12\times3, \dfrac12\times-4)=A'(1.5,-2)

Required rule: (x,y)\to(\dfrac12x,\dfrac12y)

3 0
3 years ago
If 3.5 g H2 react with 18.7 g O2 what is the limiting reactant?
Pachacha [2.7K]
O2 is the limiting reactant 

3 0
3 years ago
Read 2 more answers
Opal is a hydrated form of silica. If a laboratory analysis of a sample of opal reveals it to contain29.2% Si, 33.3%O, and 37.5%
ZanzabumX [31]
Let us assume that there is a 100g sample of Opal. The masses of each element will be:
29.2g Si
33.3g O
37.5g H2O
Now we divide each constituent's mass by its Mr to get the moles present
Si: (29.2 / 28) = 1.04
O: (33.3 / 16) = 2.08
H2O: (37.5 / 18) = 2.08
Now we divide by the smallest number and obtain:
Si: 1
O: 2
H2O: 2
Thus, the empirical formula of Opal is:
SiO2 . 2H2O
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3 years ago
Can you people help me please
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