3 years ago

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:

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: $(x,y)\to(\dfrac12x,\dfrac12y)$

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3 years ago

If 3.5 g H2 react with 18.7 g O2 what is the limiting reactant?

Pachacha [2.7K]

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3 years ago

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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

vredina [299]

Because they believed that heavenly bodies’ circular motions where caused by their being attached to unseen resolving solid spheres

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